JP2006009692A - Current braking type ignition device for internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a current braking type ignition device for an internal combustion engine, preventing ignition at an over advanced position, by breaking a primary current of an ignition coil when a switch operated from the outside is opened. <P>SOLUTION: Contacts Ry1a, Ry2a of relays are respectively inserted between a power source 1 and a control unit 4, and the power source 1 and a primary coil 2a of the ignition coil. The control unit 4 has a switch control means controlling the relay RY1 and the relay RY2, so that the on-state of the contact Ry1a and contact Ry2a is held when the remote control switch 5 is in the on-state and thereby to allow application of power supply voltage from the power source 1 to the control unit 4, the contacts Ry1a and Ry2a are opened with a state where the primary current does not pass through the ignition coil 2 when the remote control switch 5 becomes an off-state, and thereby supply of the power supply voltage to the control unit 4 is stopped. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a current interrupt type internal combustion engine ignition in which a primary current flowing through a primary coil of an ignition coil is on / off controlled by a primary current control switch such as a transistor to induce a high voltage for ignition in a secondary coil of the ignition coil. It relates to the device.

  For example, as disclosed in Patent Document 1, an ignition coil in which a power supply voltage is applied to a primary coil from a power source such as a battery, and a transistor provided to turn on and off a primary current flowing from the power source through the primary coil of the ignition coil And a primary current control means for controlling the primary current control switch to be turned on at a timing advanced from the ignition timing of the internal combustion engine and then turned off at the ignition timing. A current interrupting type ignition device for an internal combustion engine including a unit is widely used. In this type of ignition device, an external operation switch such as a key switch is provided between the power source, the control unit, and the ignition coil, and the control unit and the ignition coil are switched from the power source when the external operation switch is on. A power supply voltage is applied to the ignition device to bring it into an operating state.

In the internal combustion engine ignition device, when the primary current control switch is turned from the on state to the off state by the control unit, a high voltage for ignition is induced in the secondary coil of the ignition coil, and this high voltage is By being applied to the spark plug, a spark discharge is generated in the spark plug and the engine is ignited.
JP 2001-123929 A (FIG. 1)

  In the current interrupting type ignition device for an internal combustion engine as described above, when the primary current control switch is turned from the on state to the off state, a high voltage is induced in the secondary coil of the ignition coil to perform the ignition operation. Even when the external operation switch is opened, a high voltage may be induced in the secondary coil of the ignition coil.

  That is, if the primary current control switch is on at the moment the driver opens the external operation switch, the primary current control switch is turned off when the external operation switch is opened, and the primary current control of the ignition coil Is interrupted, a voltage is induced in the secondary coil of the ignition coil. When this voltage is considerably high, spark discharge occurs in the spark plug, and the engine may be ignited at the over-advance position depending on the timing at which the external operation switch is opened. When the engine is ignited at the over-advanced angle position, a large force is applied to push back the piston, so that an excessive force is applied to the engine and the life of the engine may be shortened.

  An object of the present invention is to provide an ignition device for a current interrupting internal combustion engine that can eliminate the possibility of the engine being ignited at the over-advanced position when the external operation switch is opened.

  The present invention relates to an ignition coil in which a power supply voltage is applied from a power source to a primary coil, a primary current control switch provided to turn on and off a primary current flowing from the power source through the primary coil of the ignition coil, and a primary current control switch And a control unit having primary current control means for controlling the engine to be turned on at a timing advanced from the ignition timing of the internal combustion engine and then to be turned off at the ignition timing, and the external operation switch is in the on state An ignition device for a current interrupting internal combustion engine, which is sometimes provided to operate by being supplied with a power supply voltage from a power supply to a control unit, is an object.

  In the present invention, at least one power supply switch capable of on / off control is provided, and when the power supply switch is in the on state, the power supply that supplies the power supply voltage from the power source to the control unit without passing through the external operation switch A circuit is provided.

  In the present invention, when the external operation switch is in the on state, the power supply switch is held in the on state to allow the power supply voltage to be applied to the control unit through the power supply circuit. When the power supply switch is turned off, the power supply switch is controlled so that the power supply switch is turned off and the supply of the power supply voltage to the control unit is stopped while the primary current is not flowing through the ignition coil. A switch control means is provided in the control unit.

  With the above configuration, when the external operation switch is opened while the primary current control switch is on, the power supply switch is turned off after the primary current is not flowing through the ignition coil. In order to stop the supply of power supply voltage to the control unit, the primary current of the ignition coil is cut off at the moment when the external operation switch is opened, preventing the engine from being ignited at the over-advanced position. Can do.

  The switch control means provided in the control unit in a preferred embodiment of the present invention is such that when the external operation switch is in the on state, the power supply switch is turned on and the power supply voltage is applied from the power source to the control unit through the power supply circuit. When the external operation switch is turned off while the internal combustion engine is rotating and the primary current is flowing through the ignition coil, the primary current control means turns off the primary current of the ignition coil. After that, the power supply switch is turned off to stop the supply of the power supply voltage to the control unit, and the external operation switch is operated while the internal combustion engine is rotating but the primary current is not flowing through the ignition coil. When power is turned off or when the external operation switch is turned off with the internal combustion engine stopped Switch controlling the power supply control switch so as to stop the supply of power supply voltage to the to the control unit in an OFF state.

  As described above, when the power supply circuit for supplying the power supply voltage to the control unit is provided in a system different from the external operation switch, the engine is stopped while the primary current of the ignition coil is flowing, and the primary of the ignition coil When it becomes impossible to cut off the current, the primary current of the ignition coil continues to flow, and the ignition coil may burn out. On the other hand, when the external operation switch is turned off while the internal combustion engine is stopped, the power supply switch is turned off to stop the supply of power supply voltage to the control unit. Thus, the primary current can be prevented from continuing to flow through the ignition coil, and the ignition coil can be prevented from being burned out.

  According to another preferred aspect of the present invention, the switch control means provided in the control unit holds the power supply switch in the on state when the external operation switch is in the on state, and supplies the power When the external operation switch is turned off while the internal combustion engine is rotating and the primary current is flowing through the ignition coil, the primary current control means turns off the primary current of the ignition coil. The power supply switch is turned off to stop the supply of power supply voltage to the control unit, and external operation is performed while the internal combustion engine is rotating and no primary current is flowing through the ignition coil. When the power switch is turned off, the power supply switch is immediately turned off to stop the supply of power supply voltage to the control unit, and the internal combustion engine When the external operation switch is turned off while the power supply is stopped, power is supplied so that the power supply switch is turned off and the supply of power supply voltage to the control unit is stopped after the set time has elapsed. Control the control switch.

  As described above, when the external operation switch is turned off with the internal combustion engine stopped, the power supply switch is turned off after the set time has elapsed, and the power supply voltage to the control unit is set. Since the primary current of the ignition coil can be shut off in a state where combustion is no longer performed in the cylinder of the engine, the supply of the power supply voltage to the control unit is stopped and the ignition coil is stopped. The ignition operation can be prevented when the primary current is interrupted.

  According to another preferred aspect of the present invention, the switch control means provided in the control unit holds the power supply switch in the on state when the external operation switch is in the on state, and the power supply voltage is supplied to the control unit through the power supply circuit. When the external operation switch is turned off while the internal combustion engine is rotating and the primary current is flowing through the ignition coil, the primary current control means turns off the primary current of the ignition coil. The power supply switch is turned off to stop the supply of power supply voltage to the control unit, and external operation is performed while the internal combustion engine is rotating and no primary current is flowing through the ignition coil. When the power switch is turned off, the power supply switch is immediately turned off to stop the supply of power supply voltage to the control unit, and the internal combustion engine When the external operation switch is turned off with no primary current flowing through the ignition coil, the power supply switch is immediately turned off to stop the supply of power supply voltage to the control unit. When the engine is stopped and the external operation switch is turned off with the primary current flowing through the ignition coil, the power supply switch is turned off after the set time has elapsed, and the power to the control unit is turned off. The power supply control switch is controlled to stop the voltage supply.

  As described above, when the external operation switch is turned off while the internal combustion engine is stopped and the primary current is flowing through the ignition coil, the power supply switch is turned off after the set time has elapsed. Since the primary current of the ignition coil can be cut off when combustion is no longer performed in the cylinder of the engine, the supply of the power supply voltage to the control unit is stopped and the primary coil of the ignition coil is stopped. It is possible to prevent the ignition operation from being performed when the current is interrupted.

  In a preferred embodiment of the present invention, at least one power supply switch capable of on / off control is provided, and when the power supply switch is in the on state, the primary unit of the control unit and the ignition coil is not passed from the power source without passing through the external operation switch. A power supply circuit is configured to supply a power supply voltage to both of the coils.

  By configuring the power supply circuit in this way, it is possible to prevent an unnecessary power supply voltage from being applied to the primary current control switch through the primary coil of the ignition coil when the engine is stopped. Can extend the lifetime of

  When the power supply circuit is configured as described above, the control unit holds the power supply switch in the on state when the external operation switch is in the on state, and controls the control unit and the ignition coil through the power supply circuit. The power supply voltage is allowed to be applied to the primary coil, and when the external operation switch is turned off, the power supply switch is turned off with no primary current flowing through the ignition coil. And a switch control means for controlling the power supply switch so as to stop the supply of the power supply voltage to the primary coil of the ignition coil.

  As described above, when the power supply circuit is configured so that the power supply voltage is supplied from the power supply to the control unit and the primary coil of the ignition coil without passing the external operation switch when the power supply switch is in the ON state. In the preferred embodiment of the present invention, the switch control means provided in the control unit is configured to hold the power supply switch in the on state when the external operation switch is in the on state, and control the primary unit of the control unit and the ignition coil through the power supply circuit. When the external operation switch is turned off while the internal combustion engine is rotating and the primary current is flowing through the ignition coil, the ignition current is controlled by the primary current control means. Wait until the primary current of the coil is turned off, and then turn off the power supply switch to turn off the control unit and ignition switch. When the external operation switch is turned off and the internal combustion engine is stopped while the internal combustion engine is rotating and the primary current is not flowing through the ignition coil When the external operation switch is turned off, the power supply control switch is immediately turned off so that the supply of the power supply voltage to the control unit and the primary coil of the ignition coil is stopped. Control.

  Further, as described above, the power supply circuit is configured to apply a power supply voltage from the power supply to the control unit and the primary coil of the ignition coil without passing the external operation switch when the power supply switch is in the ON state. In another preferred embodiment of the present invention, the switch control means provided in the control unit may be configured such that when the external operation switch is in the on state, the power supply switch is held in the on state and the control unit is ignited through the power supply circuit. A primary current control means that allows a power supply voltage to be applied to the primary coil of the coil and when the external operation switch is turned off while the internal combustion engine is rotating and the primary current is flowing through the ignition coil And wait for the primary current of the ignition coil to be turned off, and then turn off the power supply switch. When the external operation switch is turned off while the internal combustion engine is rotating and the primary current is not flowing to the ignition coil, the power supply switch is immediately turned off. When the external operation switch is turned off while the internal combustion engine is stopped, the set time has elapsed. Thereafter, the power supply control switch is controlled so that the power supply switch is turned off and the supply of the power supply voltage to the primary coil of the control unit and the ignition coil is stopped.

  In addition, as described above, the power supply circuit is configured to apply the power supply voltage from the power source to the control unit and the primary coil of the ignition coil without passing the external operation switch when the power supply switch is in the ON state. In another preferred embodiment of the present invention, the switch control means provided in the control unit is configured to hold the power supply switch in the on state when the external operation switch is in the on state and to connect the control unit through the power supply circuit. Allowing the supply voltage to be applied to the primary coil of the ignition coil, and primary current control when the external operation switch is turned off while the internal combustion engine is rotating and the primary current is flowing through the ignition coil The control unit turns off the power supply switch after waiting for the primary current of the ignition coil to be turned off by the means When the supply of power voltage to the primary coil of the ignition coil is stopped and the external operation switch is turned off when the internal combustion engine is rotating and the primary current is not flowing through the ignition coil, the power supply switch is immediately Is turned off, the supply of power supply voltage to the primary coil of the control unit and the ignition coil is stopped, the internal combustion engine is stopped, and the external operation switch is turned off when the primary current is not flowing through the ignition coil. Immediately turn off the power supply switch to stop the supply of power supply voltage to the control unit and the primary coil of the ignition coil, stop the internal combustion engine, and operate the external current with the primary current flowing through the ignition coil. When the power switch is turned off, the power supply switch is turned off after the set time has elapsed, and the ignition unit is connected to the control unit. It controls the power supply control switch to stop the supply of power supply voltage to the primary coil Le.

  As described above, when a power supply voltage is supplied from the power source to the control unit and the primary coil of the ignition coil without passing the external operation switch when the power supply switch is in the ON state, the power supply circuit is turned on. Inserted between the power supply and the primary coil of the ignition coil, and the first power supply switch provided so as to apply the power supply voltage from the power supply to the control unit without passing through the external operation switch. A second power supply switch provided to apply the output of the power supply to the primary coil of the ignition coil without passing through the external operation switch when the power supply is in the on state, and the first power supply from the power supply A power supply voltage is applied to the control unit through the switch for power supply, and a power supply voltage is applied from the power supply to the primary coil of the ignition coil through the second power supply switch. It can be configured.

  The power supply circuit also includes a single power supply switch provided to supply a power supply voltage from the power supply to the control unit and the primary coil of the ignition coil without passing an external operation switch when the power supply circuit is on. Thus, the power supply voltage may be applied from the power source to the control unit and the primary coil of the ignition coil through the power supply switch.

  As described above, according to the present invention, when the external operation switch is opened while the primary current control switch is in the ON state, the power supply is performed after the primary current does not flow through the ignition coil. Since the power supply voltage supply to the control unit is stopped by turning off the control switch, the primary current of the ignition coil is cut off at the moment when the external operation switch is opened, and the engine is ignited at the over-advanced position. Can be prevented. Therefore, when the external operation switch is opened, it is possible to prevent an impact from being applied to the engine due to over-advanced ignition, and it is possible to prevent the engine from being damaged or shortening its life.

  In the present invention, when controlling the power supply switch, when the external operation switch is turned off, the internal combustion engine is stopped in addition to the control condition whether the internal combustion engine is rotating or stopped. When the external operation switch is turned off and the power supply switch is turned off to stop the supply of power supply voltage to the control unit, the primary current is supplied to the ignition coil. Since the primary current can be prevented from continuing to flow through the ignition coil when the engine is stopped in a flowing state, the ignition coil can be prevented from being burned out.

  In the present invention, when controlling the power supply switch, when the external operation switch is turned off, the internal combustion engine is stopped in addition to the control condition whether the internal combustion engine is rotating or stopped. When the switch for external operation is turned off in the state where the power is on, the power supply switch is turned off after the set time elapses to stop supplying the power supply voltage to the control unit. In this case, when the engine is stopped while the primary current is flowing through the ignition coil, not only can the primary current continue to flow through the ignition coil, but combustion is not performed in the cylinder of the engine. Since the primary current of the ignition coil can be cut off, it is possible to prevent unnecessary ignition operation from being performed when the primary current of the ignition coil is cut off.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
In FIG. 1, reference numeral 1 denotes a power source for an ignition device including a battery whose negative terminal is grounded. Reference numeral 2 denotes a primary coil 2a and a secondary coil 2b that are commonly connected at one end. A power source voltage is supplied from the power source 1 to the primary coil 2a. An ignition coil to be applied. Reference numeral 3 denotes a primary current control switch provided to turn on and off the primary current flowing from the power source 1 through the primary coil of the ignition coil. In the illustrated example, a primary current control switch 3 is constituted by an NPN transistor TR1 whose emitter is grounded, and the collector of the transistor is connected to the other end of the primary coil 2a of the ignition coil. The other end of the secondary coil of the ignition coil 2 is connected to a non-ground side terminal of a spark plug PL attached to the cylinder of the engine.

  Reference numeral 4 denotes a control unit having primary current control means for controlling the primary current control switch 3 to be turned on at a timing advanced from the ignition timing of the internal combustion engine and then to be turned off at the ignition timing. Is an external operation switch having one end connected to the positive terminal of the battery constituting the battery. The external operation switch 5 is a switch operated by a driver like a key switch, and the control unit 4 operates by being supplied with a power supply voltage from the power supply 1 when the external operation switch 5 is in an ON state.

  The control unit 4 is a constant voltage input through the microprocessor (MPU) 4A constituting the primary current control means and the output voltage of the power source 1 through the external operation switch 5 and the diode D1 with the cathode facing the switch 5 side. A circuit 4B, and a power supply voltage detection circuit 4C connected between the connection point of the external operation switch 5 and the diode D1 and the ground and detecting the output voltage of the power supply 1 through the external operation switch 5; A drive signal is supplied from a predetermined port of 4A to the base of the transistor TR1.

  The constant voltage circuit 4B is a circuit that converts the output voltage of the battery 1 into a voltage (5V) suitable for driving the microprocessor 4A, and the output voltage is applied to the power supply terminal of the microprocessor 4A. The constant voltage circuit 4B is configured by a three-terminal regulator, for example. The power supply voltage detection circuit 4C is composed of a resistance voltage dividing circuit composed of a series circuit of resistors R1 and R2, and detects the output voltage of the power supply 1 only when the external operation switch 5 is in the ON state. The output signal of the power supply voltage detection circuit 4C is input to a predetermined port of the microprocessor 4A through an A / D converter (not shown).

  A magnet generator 6 driven by a crankshaft of the internal combustion engine is charged with a battery constituting the power source 1 through a charging circuit (not shown) by an output voltage of an armature coil provided on the stator side of the magnet generator 6. It has become so. 7 is a signal generator for detecting the front end edge and the rear end edge in the rotation direction of the arc-shaped reluctator 8 formed on the outer periphery of the rotor yoke of the magnet generator 6 and generating pulse signals S1 and S2 having different polarities. The pulse signals S1 and S2 generated by the signal generator 7 are converted by the waveform shaping circuit 9 into signals having a waveform that can be recognized by the microprocessor, and input to a predetermined port of the microprocessor 4A. As shown in FIG. 4A, the signal generator 7 generates one pulse signal S1 at the reference crank angle position θ1 at which energization of the primary current of the ignition coil is started, and is delayed from the reference crank angle position θ1. The other pulse signal S2 is generated at the crank angle position θ2. In FIG. 4, θ on the horizontal axis indicates the crank angle.

  In FIG. 1, RY1 is a first relay having an exciting coil Y1 and a normally open contact Ry1a. The contact Ry1a is connected to a power supply voltage from the power supply 1 to the control unit 4 without going through the external operation switch 5 when in the ON state. Is connected between the positive terminal of the battery constituting the power source 1 and the non-ground side input terminal of the constant voltage power circuit 4B. One end of the exciting coil Y1 is connected to the positive terminal of the battery constituting the power source 1, and the other end is connected to the collector of an NPN transistor TR2 whose emitter is grounded. The base of the transistor TR2 is connected to a predetermined port of the microprocessor 4A. When a predetermined condition described later is satisfied, the microprocessor 4A gives a drive signal to the transistor TR2 to turn on the transistor TR2, thereby exciting the transistor TR2. The coil Y1 is excited to turn on the contact Ry1a.

  RY2 is a second relay having an exciting coil Y2 and a normally open contact Ry2a. The contact Ry2a is a power supply voltage from the power source 1 to the primary coil 2a of the ignition coil without going through the external operation switch 5 when in the ON state. Is connected between the positive terminal of the battery constituting the power source 1 and one end of the primary coil 2a. One end of the exciting coil Y2 is connected to the positive terminal of the battery constituting the power source 1, and the other end is connected to the collector of an NPN transistor TR3 whose emitter is grounded. The base of the transistor TR3 is connected to a predetermined port of the microprocessor 4A. When a predetermined condition to be described later is satisfied, the microprocessor 4A gives a drive signal to the transistor TR3 to turn on the transistor TR3. Y2 is excited to turn on the contact Ry2a.

  In the present embodiment, the contact Ry1a constitutes a first power supply switch provided so as to apply a power supply voltage from the power supply 1 to the control unit 4 without passing through the external operation switch 5 when in the on state. When the contact Ry2a is inserted between the power source 1 and the primary coil 2a of the ignition coil and is in the ON state, the output of the power source 1 is applied to the primary coil 2a of the ignition coil 2 without passing through the external operation switch 5. A second power supply switch provided to do this is configured.

  The first power supply switch and the second power supply switch allow the power supply voltage to be supplied to the control unit 4 from the power supply 1 without passing through the external operation switch 5 (through the first power supply switch). A power supply circuit is provided that applies a power supply voltage to the primary coil 2a of the ignition coil 2 through the power supply 1 without passing through the external operation switch 5 (second power supply switch).

  In the illustrated example, the ignition unit 10 is constituted by the control unit 4, the waveform shaping circuit 9, the diode D1, and the transistors TR1 to TR3.

  In the ignition device shown in FIG. 1, when the microprocessor 4A executes a predetermined program, the primary current control switch 3 is turned on at a timing advanced from the ignition timing of the internal combustion engine as shown in FIG. The primary current control means 20 for controlling the ignition timing to be turned off after being turned on, and the power supply switch (in this example, the relay RY1 of the relay RY1) when it is determined that the external operation switch 5 is turned on. When the contact point Ry1a and the contact point Ry2a) 21 of the relay RY2 are kept in the ON state to allow the power supply voltage to be applied to the control unit through the power supply circuit, and when it is determined that the external operation switch 5 has been turned off. When the primary current is not flowing through the ignition coil 2, the power supply switch 21 is turned off to stop the supply of the power supply voltage to the control unit 4. Sea urchin, constitutes a switch control means 22 for controlling the power supply switch 21.

  The primary current control means 20 includes, for example, a rotational speed detection means 20A for detecting the rotational speed of the engine from an interval (time required for one revolution of the crankshaft) at which the signal generator 7 generates the pulse signal S1 or S2. Ignition timing calculation means 20B for calculating the crank angle position θi corresponding to the ignition timing of the engine with respect to the detected rotational speed, and the drive signal Vb to the base of the transistor TR1 when the signal generator 7 generates the pulse signal S1. To start energization of the primary coil of the ignition coil and start measurement of the crank angle position corresponding to the ignition timing. When the crank angle position θi corresponding to the ignition timing is detected, the transistor TR1 The driving signal generator 20C stops the supply of the driving signal Vb.

  Further, for example, the switch control means 22 determines that the external operation switch 5 is in the ON state when the power supply voltage is detected through the power supply voltage detection circuit 4C, and the power supply voltage is not detected through the power supply voltage detection circuit 4C. Switch state discriminating means 22A for discriminating that the external operation switch 5 is turned off, and that the internal combustion engine is rotating when the signal generator 7 is generating the pulse signal S1, Engine state determination means 22B for determining that the engine is stopped when the generator no longer generates the pulse signal S1, and the primary of the ignition coil 2 when the drive signal Vb is applied to the transistor TR1 from the microprocessor. When it is determined that the coil is energized and the supply of the drive signal to the transistor TR1 is stopped, the primary coil of the ignition coil 2 is stopped. The ignition coil energization determining means 22C for determining that the energization of the engine is stopped, the switch state determining means 22A, the engine state determining means 22B, and the power supply switch 21 according to the determination results by the ignition coil energization determining means 22C. It is comprised with the switch drive means 21D to drive.

  The switch driving unit 21D holds the power supply switch 21 in the on state when the switch state determining unit 22A determines that the external operation switch 5 is in the on state, and from the power source 1 to the power supply switch ( Ry1a, Ry2a) 21 allows the control unit 4 and the primary coil 2a of the ignition coil to be supplied with a power supply voltage, and determines that the internal combustion engine is rotating by the engine state determining means 22B and determines whether the ignition coil is energized. When it is determined that the primary current is flowing through the ignition coil 2 by the means 22C, the primary current control means 20 is activated when the switch state determination means 22A determines that the external operation switch 5 is turned off. After waiting for the primary current of the ignition coil 2 to be turned off, the power supply switches (Ry1a, Ry2a) 21 are turned off. Supply of power supply voltage to the control unit 4 and the primary coil 2a of the ignition coil is stopped, the internal combustion engine is determined to be rotating by the engine state determination means 22B, and the primary current is supplied to the ignition coil by the ignition coil energization determination means 22C. When it is determined that the external operation switch 5 has been turned off by the switch state determination unit 22A while it is determined that the engine is not flowing, and the internal combustion engine is determined to be stopped by the engine state determination unit 22B. When the switch state determining means 22A determines that the external operation switch 5 is turned off, the power supply switch (Ry1a, Ry2a) 21 is immediately turned off to turn off the control unit 4 and the primary coil 2a of the ignition coil. The switch state determining unit 22A, the engine state determining unit 22B, Driving the power supply switch 21 in accordance with the discrimination result by fire coil energization determination unit 22C.

  FIG. 3 shows a flowchart showing an algorithm of tasks to be executed by the microprocessor in order to configure the switch control means 22 that performs the control as described above. The task shown in FIG. 3 is executed at a minute time interval. When this task is performed, the relays RY1 and RY2 are both excited, and the respective contacts Ry1a and Ry2a are both in the on state.

  When the task of FIG. 3 is started, first, in step 1, it is determined whether or not the switch state determining means 22A determines that the external operation switch 5 is in the OFF state. As a result, when it is determined that the external operation switch 5 is not in the off state (in the on state), nothing is performed thereafter (while the contacts Ry1a and Ry2a are kept in the on state), this task is terminated. To do.

  If it is determined in step 1 that the external operation switch 5 is in the off state, the process proceeds to step 2 to determine whether or not the engine state determining means 22B determines that the engine is rotating. As a result, when it is determined that the engine is rotating, the routine proceeds to step 3, and whether or not it is determined by the ignition coil energization state determination means 22 </ b> C that the primary coil 2 a of the ignition coil is energized ( It is determined whether or not the drive signal Vb is given to the primary current control switch 3). As a result, when it is determined that the primary coil of the ignition coil is energized, this task is terminated without doing anything thereafter, and the energization of the primary coil of the ignition coil is stopped by the ignition coil energization determining means 22C. When the determination is made, the routine proceeds to step 4 to prohibit energization of the primary coil 2a of the ignition coil and ignition (interruption of the primary current), and in step 5, the transistors TR2 and TR3 are turned off to relay. RY1 and RY2 are de-energized to complete this task.

  If it is determined in step 2 that the engine is stopped, the process proceeds to step 5 where the transistors TR2 and TR3 are turned off and the relays RY1 and RY2 are de-energized, and then this task is terminated.

  In the ignition device shown in FIG. 1, when cranking is performed by the starter for the internal combustion engine and the external operation switch 5 is closed, the power supply voltage is supplied from the power source 1 to the control unit 4 through the external operation switch 5 and the diode D1. Is given. This activates the microprocessor 4A. After starting up, the microprocessor 4A initializes each part, and after confirming from the output of the power supply voltage detection circuit 4C that the external operation switch 5 is in the on state, turns on the transistors TR1 and TR3. Energize the relays RY1 and RY2. As a result, the contacts Ry1a and Ry2a are closed, so that the power supply voltage is applied from the power supply 1 to the control unit 4 without passing through the external operation switch 5, and the power supply voltage is applied to the primary coil 2a of the ignition coil.

  As shown in FIG. 4, when the signal generator 7 generates the pulse signal S1, the microprocessor 4A gives the drive signal Vb to the transistor TR1 constituting the primary current control switch 3 to turn on the transistor TR1. To. As a result, as shown in FIG. 4B, a primary current I1 of the ignition coil flows from the power source 1 through the contact Ry2a, the primary coil 2a of the ignition coil, and the collector emitter of the transistor TR1. The microprocessor 4A stops the supply of the drive signal to the transistor TR1 when detecting the ignition timing θi of the engine. As a result, the transistor TR1 is turned off, so that the primary current of the ignition coil is cut off. When the primary current of the ignition coil is cut off, a high voltage is induced in the primary coil 2a, and this voltage is boosted by the boost ratio of the ignition coil, and a high voltage for ignition is induced in the secondary coil 2b. Since the ignition high voltage is applied to the spark plug PL, spark discharge occurs in the spark plug PL, and the engine is ignited.

  When the external operation switch 5 is turned off while the internal combustion engine is rotating and the primary current is flowing through the ignition coil 2, the microprocessor 4A causes the primary current control means to turn off the primary current of the ignition coil. After that, the transistors TR2 and TR3 are turned off to turn off the exciting coils Y1 and Y2, and the contacts Ry1a and Ry2a are turned off to supply power to the primary coil 2a of the control unit 4 and the ignition coil. Stop supplying. Therefore, for example, even if the external operation switch 5 is opened at the crank angle position of θ3 in FIG. 4 that is advanced from the crank angle position θi corresponding to the normal ignition timing, the contacts Ry1a and Ry2a remain in the ON state. In order to maintain the energization of the control unit 4 and the ignition coil 2, the transistor TR1 is kept on until the crank angle position θi corresponding to the normal ignition timing determined by the primary current control means 20, An ignition operation is performed at the ignition timing.

  The external operation switch 5 is turned off when the external operation switch 5 is turned off while the internal combustion engine is rotating and no primary current flows through the ignition coil, and when the internal combustion engine is stopped. When the state is set, the microprocessor immediately turns off the transistors TR2 and TR3, turns off the contacts Ry1a and Ry2a, and stops the supply of the power supply voltage to the control unit 4 and the primary coil 2a of the ignition coil.

  In this type of conventional ignition device, the power supply switch 21 (Ry1a, Ry2a) for supplying the power voltage to the primary coil of the control unit 4 and the ignition coil without passing through the external operation switch 5 is not provided. As soon as the external operation switch 5 is opened, the energization of the control unit 4 and the primary coil of the ignition coil is stopped. Therefore, as shown in FIG. 5, for example, from the crank angle position θi corresponding to the normal ignition timing. When the external operation switch 5 is opened at the crank angle position θ3 that is over-advanced, the primary current I1 is cut off at the over-advance angle position θ3 and an ignition operation is performed. As described above, when the ignition operation is performed at the over-advanced angle position, an impact is applied to the engine, which may damage the engine or shorten the life of the engine.

  In contrast, according to the present invention, when the external operation switch 5 is opened while the primary current control switch 3 is in the on state, the primary current does not flow through the ignition coil 2. Since the power supply switches (Ry1a and Ry2a) are turned off to stop the supply of power supply voltage to the control unit, the primary current of the ignition coil is cut off at the moment when the external operation switch 5 is opened. It is possible to prevent the engine from being ignited at the advanced position. Therefore, when the external operation switch is opened, it is possible to prevent an impact from being applied to the engine due to over-advanced ignition, and it is possible to prevent the engine from being damaged or shortening its life.

  When a power supply circuit for supplying a power supply voltage to the control unit is provided in a separate system from the external operation switch as in this embodiment, the engine stops in a state where the primary current of the ignition coil is flowing, and the ignition coil When the primary current cannot be cut off, the primary current of the ignition coil continues to flow, and the ignition coil may be burned out. In order to prevent this, in the above embodiment, when the external operation switch is turned off while the internal combustion engine is stopped, the power supply switch is turned off to supply the power supply voltage to the control unit. To stop. If comprised in this way, since it can prevent that a primary current continues flowing into an ignition coil, it can prevent that an ignition coil burns out.

  In the example shown in FIG. 1, a first power supply switch (Ry1a) and a second power supply are provided between the power supply 1 and the control unit 4 and between the power supply 1 and the primary coil 2a of the ignition coil 2, respectively. The power supply circuit for supplying the power supply voltage to the control unit 4 and the primary coil 2a of the ignition coil without passing through the external operation switch 5 is used for external operation when the switch (Ry2a) is provided. The power supply 1 may be provided with one power supply switch provided to supply the power supply voltage to the control unit 4 and the primary coil 2a of the ignition coil without passing through the switch 5.

  For example, as shown in FIG. 6, one relay RY is provided, the exciting coil Y of this relay RY is connected between the positive terminal of the power source 1 and the collector of the transistor TR2, and the normally open contact Rya is connected to the power source. 1 is connected between the positive terminal of the constant voltage circuit 4B and the non-grounded side input terminal of the constant voltage circuit 4B, and one end of the primary coil 2a of the ignition coil 2 is connected to the non-grounded side terminal of the constant voltage circuit 4B. . In this example, the transistor TR3 and the relay RY2 shown in FIG. 1 are omitted. As the relay RY in FIG. 6, the relay RY having the same current capacity as that of the relay RY2 in FIG. 1 (that can flow the primary current of the ignition coil) is used. The other configuration of the embodiment shown in FIG. 6 is the same as the example shown in FIG.

  When configured as shown in FIG. 6, the number of relays and switches (transistors in the above example) for turning on and off the exciting current of the relay can be reduced, so that the configuration can be simplified. Cost can be reduced.

  In each of the above embodiments, when the external operation switch is opened while the engine is stopped, the power supply switch 21 is immediately turned off, but the internal combustion engine is stopped. When the external operation switch 5 is turned off, the power supply switch 21 is turned off after the set time has elapsed, and the supply of power supply voltage to the control unit 4 and the primary coil 2a of the ignition coil is stopped. It is preferable to do so.

  That is, the switch control means 22 holds the power supply switch 21 in the ON state when the external operation switch 5 is in the ON state, and supplies the power supply voltage to the control unit 4 and the primary coil 2a of the ignition coil through the power supply circuit. When the external operation switch 5 is turned off while the internal combustion engine is rotating and the primary current is flowing through the ignition coil, the primary current control means 20 causes the primary of the ignition coil 2 to be applied. After waiting for the current to be turned off, the power supply switch 21 is turned off to stop the supply of power supply voltage to the control unit 4 and the primary coil 2a of the ignition coil, and the internal combustion engine is rotating. When the external operation switch 5 is turned off with no primary current flowing through the ignition coil, the power supply switch is immediately turned off and the control unit is turned off. When the external operation switch 5 is turned off with the internal combustion engine stopped, the external operation switch is turned off. The power supply control switch 21 is controlled so that the power supply switch 21 is turned off and the supply of the power supply voltage to the primary coil 2a of the ignition unit is stopped after the set time has elapsed. Preferably, it is a means to do this.

  As described above, when the external operation switch 5 is turned off while the internal combustion engine is stopped, the power supply switch is turned off after waiting for the set time to elapse. When the supply of power supply voltage to the unit is stopped, when the engine stops while the primary current of the ignition coil is flowing, the primary current of the ignition coil in a state where combustion is not performed in the cylinder of the engine. Since the supply of power supply voltage to the control unit is stopped and the primary current of the ignition coil is interrupted, it is possible to prevent unnecessary ignition operation from being performed.

  In the present invention, the switch control means 22 provided in the control unit holds the power supply switch 21 in the on state when the external operation switch 5 is in the on state, and controls the primary unit of the control unit 4 and the ignition coil through the power supply circuit. When the external operation switch 5 is turned off while the internal combustion engine is rotating and the primary current is flowing through the ignition coil, the primary current control means 20 is allowed. After waiting for the primary current of the ignition coil to be turned off, the power supply switch 21 is turned off to stop the supply of power supply voltage to the control unit 4 and the primary coil 2a of the ignition coil. When the external operation switch is turned off while the motor is rotating and no primary current is flowing through the ignition coil, the power supply switch When the switch 21 is turned off, the supply of the power supply voltage to the control unit 4 and the primary coil 2a of the ignition coil is stopped, the internal combustion engine is stopped, and the external operation switch is in a state where no primary current flows through the ignition coil. When is turned off, the power supply switch is turned off immediately to stop the supply of power supply voltage to the control unit and the primary coil of the ignition coil, the internal combustion engine is stopped, and the primary current flows to the ignition coil. When the external operation switch is turned off while the power is on, the power supply switch is turned off after the set time has elapsed so that the supply of the power supply voltage to the primary coil of the control unit and the ignition coil is stopped. It may be a means for controlling the power supply control switch.

  As shown in FIG. 1, when two relays RY1 and RY2 are provided (when first and second power supply switches that can be individually controlled are provided), the external operation switch 5 is opened and the ignition coil Instead of de-energizing both relays at the same time after energization of the primary coil is stopped, first the relay RY2, which controls the energization of the primary coil of the ignition coil, is de-energized (the second power supply switch is turned off) Then, the relay RY1 that controls energization to the control unit 4 may be de-energized (the first power supply switch is turned off). As described above, when the supply of the power supply voltage to the control unit 4 is finally stopped, if there is a process that needs to be performed by the microprocessor after the ignition operation is stopped, the control is performed after the process ends. The operation of the unit can be stopped.

  In the embodiment shown in FIG. 1, two relays RY1 and RY2 are provided, but one relay having two normally open contacts is used, and one of the two normally open contacts of the one relay is connected to the other. The contacts Ry1a and Ry2a in FIG. 1 may be used. With this configuration, it is possible to simplify the configuration by reducing the number of switch elements (transistors in the above example) that turn on and off the exciting current of the relay.

  As shown in the above embodiments, when the external power switch 5 is opened, finally, the power supply voltage is prevented from being applied to both the control unit 4 and the primary coil 2a of the ignition coil. However, when the primary current control switch 3 is in the OFF state, it is possible to always apply a voltage to the primary current control switch 3 (the battery is consumed or the switch element is deteriorated). In the embodiment shown in FIG. 1, the contact Ry2a is omitted (the relay RY2 and the transistor TR3 are omitted), and the primary coil of the ignition coil is opened after the external power switch 5 is opened in the embodiment shown in FIG. It may be allowed to always apply a power supply voltage to 2a and the primary current control switch 3.

  In the above-described embodiment, the relay contact is used as the power supply switch. However, the power supply switch may be configured by a semiconductor switch capable of ON / OFF control.

  In the above embodiment, an ignition device for igniting a single cylinder internal combustion engine has been taken as an example. However, it goes without saying that the present invention can also be applied to an ignition device for igniting a multi-cylinder internal combustion engine.

  In the above embodiment, the primary current control switch 3 is constituted by a transistor, but another semiconductor switch element capable of ON / OFF control may be used as the primary current control switch 3.

It is the circuit diagram which showed the structure of one Embodiment of this invention. It is the block diagram which showed the whole structure of the ignition device containing the various means comprised by the microprocessor in embodiment shown in FIG. 2 is a flowchart showing an algorithm of a task executed by a microprocessor in order to configure a switch control unit in the embodiment shown in FIG. FIG. 2 is a waveform diagram showing a waveform of a pulse signal generated by a signal generator and a waveform of a primary current of an ignition coil with respect to a crank angle in the embodiment shown in FIG. 1. It is the wave form diagram which showed the waveform of the pulse signal which a signal generator generate | occur | produces in the conventional electric current interruption type ignition device, and the waveform of the primary current of an ignition coil with respect to the crank angle. It is the circuit diagram which showed the structure of other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Power supply 2 Ignition coil 3 Primary current control switch 4 Control unit 5 External operation switch RY1 1st relay which comprises 1st power supply switch RY2 2nd relay which comprises 2nd power supply switch

Claims (10)

An ignition coil to which a power supply voltage is applied from a power source to a primary coil; a primary current control switch provided to turn on and off a primary current flowing from the power source through the primary coil of the ignition coil; and the primary current control switch. And a control unit having primary current control means for controlling to turn on at a timing advanced from the ignition timing of the internal combustion engine and then to turn off at the ignition timing, and the control unit has an external operation switch on. In the ignition device for a current interrupting internal combustion engine provided to operate by being supplied with a power supply voltage from the power supply when in a state,
A power supply circuit that includes at least one power supply switch capable of on / off control and applies a power supply voltage from the power supply to the control unit without passing through the external operation switch when the power supply switch is in an on state; Provided,
The control unit holds the power supply switch in an ON state when the external operation switch is in an ON state, and allows a power supply voltage to be supplied to the control unit through the power supply circuit. When the operation switch is turned off, the power supply switch is turned off to stop the supply of the power supply voltage to the control unit in a state where no primary current flows through the ignition coil. Comprising switch control means for controlling the power supply switch;
An ignition device for a current interrupting internal combustion engine characterized by the above. An ignition coil to which a power supply voltage is applied from a power source to a primary coil; a primary current control switch provided to turn on and off a primary current flowing from the power source through the primary coil of the ignition coil; and the primary current control switch. And a control unit having primary current control means for controlling to turn on at a timing advanced from the ignition timing of the internal combustion engine and then to turn off at the ignition timing, and the control unit has an external operation switch on. In the ignition device for a current interrupting internal combustion engine provided to operate by being supplied with a power supply voltage from the power supply when in a state,
A power supply circuit that includes at least one power supply switch capable of on / off control and applies a power supply voltage from the power supply to the control unit without passing through the external operation switch when the power supply switch is in an on state; Provided,
The control unit allows the power supply switch to be turned on when the external operation switch is in an on state to allow a power supply voltage to be supplied from the power source to the control unit through the power supply circuit. When the external operation switch is turned off while the internal combustion engine is rotating and the primary current is flowing through the ignition coil, the primary current control means turns off the primary current of the ignition coil. The power supply switch is turned off to stop the supply of power supply voltage to the control unit, and the internal combustion engine is rotating and no primary current flows through the ignition coil. The external operation switch is turned off when the external operation switch is turned off and the internal combustion engine is stopped. That it comprises a switch control means for controlling the power supply control switch so as to stop the supply of power supply voltage to the control unit immediately to the power supply switch to the OFF state, the
An ignition device for a current interrupting internal combustion engine characterized by the above. An ignition coil to which a power supply voltage is applied from a power source to a primary coil; a primary current control switch provided to turn on and off a primary current flowing from the power source through the primary coil of the ignition coil; and the primary current control switch. And a control unit having primary current control means for controlling to turn on at a timing advanced from the ignition timing of the internal combustion engine and then to turn off at the ignition timing, and the control unit has an external operation switch on. In the ignition device for a current interrupting internal combustion engine provided to operate by being supplied with a power supply voltage from the power supply when in a state,
A power supply circuit that includes at least one power supply switch capable of on / off control and applies a power supply voltage from the power supply to the control unit without passing through the external operation switch when the power supply switch is in an on state; Provided,
The control unit holds the power supply switch in an on state when the external operation switch is in an on state, and allows a power supply voltage to be applied to the control unit through the power supply circuit, When the external operation switch is turned off while the engine is rotating and the primary current is flowing through the ignition coil, the primary current control means turns off the primary current of the ignition coil. The power supply switch is turned off to stop the supply of power supply voltage to the control unit, and the internal combustion engine is rotating and the external current is not flowing through the ignition coil. When the operation switch is turned off, the power supply switch is immediately turned off to stop the supply of power supply voltage to the control unit. When the external operation switch is turned off while the internal combustion engine is stopped, the power supply switch is turned off after a set time has elapsed, and the power supply voltage to the control unit is reduced. Comprising a switch control means for controlling the power supply control switch so as to stop the supply;
An ignition device for a current interrupting internal combustion engine characterized by the above. An ignition coil to which a power supply voltage is applied from a power source to a primary coil; a primary current control switch provided to turn on and off a primary current flowing from the power source through the primary coil of the ignition coil; and the primary current control switch. And a control unit having primary current control means for controlling to turn on at a timing advanced from the ignition timing of the internal combustion engine and then to turn off at the ignition timing, and the control unit has an external operation switch on. In the ignition device for a current interrupting internal combustion engine provided to operate by being supplied with a power supply voltage from the power supply when in a state,
A power supply circuit that includes at least one power supply switch capable of on / off control and applies a power supply voltage from the power supply to the control unit without passing through the external operation switch when the power supply switch is in an on state. Is provided,
The control unit holds the power supply switch in an on state when the external operation switch is in an on state, and allows a power supply voltage to be applied to the control unit through the power supply circuit, When the external operation switch is turned off while the engine is rotating and the primary current is flowing through the ignition coil, the primary current control means turns off the primary current of the ignition coil. The power supply switch is turned off to stop the supply of power supply voltage to the control unit, and the internal combustion engine is rotating and the external current is not flowing through the ignition coil. When the operation switch is turned off, the power supply switch is immediately turned off to stop the supply of power supply voltage to the control unit. When the external operation switch is turned off with the internal combustion engine stopped and no primary current flowing through the ignition coil, the power supply switch is immediately turned off and the control unit is turned off. When the supply of power supply voltage is stopped, the internal combustion engine is stopped, and the external operation switch is turned off with the primary current flowing through the ignition coil, the power supply is turned on after a set time has elapsed. Comprising switch control means for controlling the power supply control switch of the power supply circuit so as to stop the supply of power supply voltage to the control unit by turning off the supply switch.
An ignition device for a current interrupting internal combustion engine characterized by the above. An ignition coil to which a power supply voltage is applied from a power source to a primary coil; a primary current control switch provided to turn on and off a primary current flowing from the power source through the primary coil of the ignition coil; and the primary current control switch. And a control unit having primary current control means for controlling to turn on at a timing advanced from the ignition timing of the internal combustion engine and then to turn off at the ignition timing, and the control unit has an external operation switch on. In the ignition device for a current interrupting internal combustion engine provided to operate by being supplied with a power supply voltage from the power supply when in a state,
Including at least one power supply switch capable of on / off control, and when the power supply switch is in an on state, the control unit and the primary coil of the ignition coil from the power supply without passing through the external operation switch; A power supply circuit for supplying a power supply voltage to the
The control unit holds the power supply switch in an on state when the external operation switch is in an on state, and a power supply voltage is applied to the control unit and a primary coil of the ignition coil through the power supply circuit. When the external operation switch is turned off, the power supply switch is turned off with no primary current flowing through the ignition coil. A switch control means for controlling the power supply switch so as to stop the supply of the power supply voltage to the coil;
An ignition device for a current interrupting internal combustion engine characterized by the above. An ignition coil to which a power supply voltage is applied from a power source to a primary coil; a primary current control switch provided to turn on and off a primary current flowing from the power source through the primary coil of the ignition coil; and the primary current control switch. And a control unit having primary current control means for controlling to turn on at a timing advanced from the ignition timing of the internal combustion engine and then to turn off at the ignition timing, and the control unit has an external operation switch on. In the ignition device for a current interrupting internal combustion engine provided to operate by being supplied with a power supply voltage from the power supply when in a state,
Including at least one power supply switch capable of on / off control, and when the power supply switch is in an on state, the control unit and the primary coil of the ignition coil from the power supply without passing through the external operation switch; A power supply circuit for supplying a power supply voltage to the
The control unit holds the power supply switch in an on state when the external operation switch is in an on state, and applies a power supply voltage to the control unit and the primary coil of the ignition coil through the power supply circuit. When the external operation switch is turned off while the internal combustion engine is rotating and the primary current is flowing through the ignition coil, the primary current control means causes the primary of the ignition coil. After waiting for the current to be turned off, the power supply switch is turned off to stop the supply of power supply voltage to the control unit and the primary coil of the ignition coil, and the internal combustion engine is rotating. When the external operation switch is turned off with no primary current flowing through the ignition coil, and the internal combustion engine is stopped. When the external operation switch is turned off in the state, the power supply switch is immediately turned off to stop the supply of power supply voltage to the control unit and the primary coil of the ignition coil. A switch control means for controlling the switch
An ignition device for a current interrupting internal combustion engine characterized by the above. An ignition coil to which a power supply voltage is applied from a power source to a primary coil; a primary current control switch provided to turn on and off a primary current flowing from the power source through the primary coil of the ignition coil; and the primary current control switch. And a control unit having primary current control means for controlling to turn on at a timing advanced from the ignition timing of the internal combustion engine and then to turn off at the ignition timing, and the control unit has an external operation switch on. In the ignition device for a current interrupting internal combustion engine provided to operate by being supplied with a power supply voltage from the power supply when in a state,
Including at least one power supply switch capable of on / off control, and when the power supply switch is in an on state, the control unit and the primary coil of the ignition coil from the power supply without passing through the external operation switch; A power supply circuit for supplying a power supply voltage to the
The control unit holds the power supply switch in an on state when the external operation switch is in an on state, and applies a power supply voltage to the control unit and the primary coil of the ignition coil through the power supply circuit. When the external operation switch is turned off while the internal combustion engine is rotating and the primary current is flowing through the ignition coil, the primary current control means causes the primary of the ignition coil. After waiting for the current to be turned off, the power supply switch is turned off to stop the supply of power supply voltage to the control unit and the primary coil of the ignition coil, and the internal combustion engine is rotating. When the external operation switch is turned off with no primary current flowing through the ignition coil, the power supply switch is immediately turned on. Is set when the external operation switch is turned off while the internal combustion engine is stopped and the supply of power supply voltage to the control unit and the primary coil of the ignition coil is stopped. Switch control means for controlling the power supply control switch to turn off the power supply switch to stop the supply of power supply voltage to the control unit and the primary coil of the ignition coil after a lapse of time. To have,
An ignition device for a current interrupting internal combustion engine characterized by the above. An ignition coil to which a power supply voltage is applied from a power source to a primary coil; a primary current control switch provided to turn on and off a primary current flowing from the power source through the primary coil of the ignition coil; and the primary current control switch. And a control unit having primary current control means for controlling to turn on at a timing advanced from the ignition timing of the internal combustion engine and then to turn off at the ignition timing, and the control unit has an external operation switch on. In the ignition device for a current interrupting internal combustion engine provided to operate by being supplied with a power supply voltage from the power supply when in a state,
Including at least one power supply switch capable of on / off control, and when the power supply switch is in an on state, the control unit and the primary coil of the ignition coil from the power supply without passing through the external operation switch; A power supply circuit for supplying a power supply voltage to the
The control unit holds the power supply switch in an on state when the external operation switch is in an on state, and applies a power supply voltage to the control unit and the primary coil of the ignition coil through the power supply circuit. When the external operation switch is turned off while the internal combustion engine is rotating and the primary current is flowing through the ignition coil, the primary current control means causes the primary of the ignition coil. After waiting for the current to be turned off, the power supply switch is turned off to stop the supply of power supply voltage to the control unit and the primary coil of the ignition coil, and the internal combustion engine is rotating. When the external operation switch is turned off with no primary current flowing through the ignition coil, the power supply switch is immediately turned on. The power supply voltage to the control unit and the primary coil of the ignition coil is stopped, the internal combustion engine is stopped, and the primary current is not flowing through the ignition coil. When the switch is turned off, the power supply switch is immediately turned off to stop the supply of power supply voltage to the primary coil of the control unit and the ignition coil, the internal combustion engine is stopped, and the ignition coil When the external operation switch is turned off while the primary current is flowing through the power supply switch, the power supply switch is turned off after a set time has elapsed and the control unit and the ignition coil are turned to the primary coil. A switch control means for controlling the power supply control switch so as to stop the supply of the power supply voltage;
An ignition device for a current interrupting internal combustion engine characterized by the above.   The power supply circuit includes a first power supply switch provided to apply a power supply voltage from the power supply to the control unit without passing through the external operation switch when the power supply circuit is in an on state, the power supply, and the power supply A second power source provided so as to apply the output of the power source to the primary coil of the ignition coil without passing through the external operation switch when inserted between the ignition coil and the primary coil. A power supply voltage is applied to the control unit from the power source through the first power supply switch, and from the power source to the primary coil of the ignition coil through the second power supply switch. 9. An ignition device for a current interrupting internal combustion engine according to any one of claims 5 to 8, wherein the ignition device is configured to provide the following. The power supply circuit is one power supply provided to supply a power supply voltage from the power supply to the control unit and a primary coil of the ignition coil without passing through the external operation switch when the power supply circuit is in an ON state. The current according to claim 5, further comprising a switch configured to apply a power supply voltage from the power supply to the control unit and a primary coil of the ignition coil through the power supply switch. Ignition system for a shut-off type internal combustion engine.

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