JP2014008925A - Brake operation detection device - Google Patents

Abstract

To prevent erroneous lighting of a brake lamp.
A brake operation detecting device includes a brake lighting circuit that turns on a lamp according to a brake operation, a signal generation circuit that generates a brake signal according to the brake operation, a brake lighting circuit, and a signal generation circuit. 30 and emits light according to the voltage output from the brake lighting circuit when the lamp is lit, and the signal generation circuit 30 according to the brake signal when receiving light from the light emitting element 21 A light receiving element 22 for setting the voltage and a CPU 40 for detecting the voltage set in the signal generation circuit 30.
[Selection] Figure 1

Description

  The present invention relates to a brake operation detection device that detects a brake operation according to a lighting state of a brake lamp.

  Patent Document 1 describes a device that detects a brake signal in response to a brake operation. Such devices often use open collector circuits.

  FIG. 4 is a circuit diagram showing a brake operation detecting device that detects a brake signal by an open collector circuit. The brake operation detection device receives an input signal from the input unit 801 of the open collector circuit, and determines the presence or absence of a side brake operation according to the level of the input signal.

  For example, when the driver performs a side brake operation, an input signal of H (High) level is supplied from the input unit 801 to the base terminal of the transistor 806 via the diode 802 and the resistance element 804. As a result, the transistor 806 is turned on, and the current flowing through the pull-up resistor element 807 is output as a brake signal to the substrate ground line 809, and the L (Low) level detection voltage generated by the voltage drop at the pull-up resistor element 807 Is supplied to the CPU 810.

  On the other hand, when the brake operation is released, an L-level input signal is supplied from the input unit 801 to the base terminal of the transistor 806, the transistor 806 is turned off, and the brake signal does not flow to the pull-up resistor element 807. Therefore, the H level set voltage set in the pull-up resistor element 807 is supplied to the CPU 810.

  The CPU 810 detects the voltage generated in the pull-up resistor element 807 according to the brake signal, and determines the presence or absence of the brake operation.

JP 2010-132143 A

  In an apparatus such as that described in Patent Document 1, when a brake signal is detected using an open collector circuit, the impedance of the substrate ground line connected to the transistor is an external circuit connected to the input portion of the open collector circuit. When the impedance is higher than the impedance of the ground wire, current may flow to the external circuit.

  For example, in a brake operation detecting device in which a brake lamp is connected to an input part of an open collector circuit, current is supplied from a transistor to a substrate ground line by an H level signal input from an external circuit while the lamp is lit, and then the brake is applied. When the operation is released, the current supplied to the substrate ground line flows to the brake lamp, and the lamp may not be temporarily turned off.

  The present invention has been made in view of the above problems, and an object thereof is to prevent erroneous lighting of a brake lamp.

  The present invention is provided between a lighting circuit for lighting a lamp according to a brake operation, a signal generation circuit for generating a brake signal according to a brake operation, the lighting circuit and the signal generation circuit, A light-emitting element that emits light according to a voltage output from the lighting circuit at the time of lighting; a light-receiving element that sets a voltage according to the brake signal in the signal generation circuit when receiving light from the light-emitting element; And a voltage detection unit that detects a voltage set in the signal generation circuit.

  In the present invention, the light emitting element emits light by the voltage supplied from the lighting circuit to the light emitting element while the lamp is lit, and the detection voltage is set in the voltage detection unit by the brake signal that flows to the light receiving element that receives the light.

  For this reason, the light emitting element and the light receiving element electrically separate the lighting circuit on the light emitting element side from the signal generating circuit and the voltage detecting unit on the light receiving element side, so that the impedance of the signal generating circuit and the voltage detecting unit is It is possible to avoid erroneous lighting of the lamp due to being higher than the impedance of the lighting circuit.

It is a block diagram which shows the brake operation detection apparatus which concerns on embodiment of this invention. It is a figure which shows the brake lighting circuit which outputs L level when the lamp provided in a brake operation detection apparatus lights, and outputs H level when a lamp is extinguished. It is a figure which shows the brake lighting circuit which outputs the signal which the output level of the brake lighting circuit shown in FIG. 2 inverted. It is a figure which shows the general brake operation detection apparatus which uses an open collector circuit.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, with reference to FIG. 1, the brake operation detection apparatus 300 which concerns on this embodiment is demonstrated.

  The brake operation detection device 300 also controls a vehicle by detecting a brake operation of a side brake by a driver of a vehicle such as a mixer vehicle.

  The brake operation detection device 300 includes a brake lighting circuit 210 that turns on a brake lamp according to a brake operation of a side brake lever by a driver, a control unit 100 that detects a brake signal according to the lighting state of the brake lighting circuit 210, Is provided. The control unit 100 is configured as, for example, an ECU (Electronic Control Unit) of a mixer vehicle.

  In the brake operation detection device 300, one end of the brake lighting circuit 210 is connected to the battery power line 201. A battery voltage Vb of a battery mounted on the vehicle is supplied to the battery power line 201. The other end of the brake lighting circuit 210 is connected to a ground line 209 provided outside the control unit 100. The battery power line 201 is a first power line that supplies a battery voltage Vb of 12 V (volts), for example. The ground line 209 is a first ground line used for grounding the lamp.

  The brake lighting circuit 210 is an analog circuit having a lamp that lights in response to a brake operation. When the brake lighting circuit 210 receives an input signal from the brake line 211 provided in the side brake, the brake lighting circuit 210 lights the lamp according to the input signal.

  For example, when the side brake lever is raised by the driver, an input signal of H (High) level is input from the brake line 211 to the brake lighting circuit 210 as a brake execution command. On the other hand, when the side brake lever is lowered, an input signal of L (Low) level is input to the brake lighting circuit 210 from the brake line 211 as a brake release command.

  When receiving an H level input signal from the brake line 211, the brake lighting circuit 210 supplies the lighting voltage Vb from the battery power line 201 to the lamp to light the lamp. On the other hand, when receiving an L level input signal from the brake line 211, the brake lighting circuit 210 stops supplying the lighting voltage Vb from the battery power supply line 201 to the lamp and turns off the lamp.

  The lamp of the brake lighting circuit 210 is provided with two voltage terminals, and one of the voltage terminals of the lamp and the input unit 101 of the control unit 100 are connected. The voltage signal output from the brake lighting circuit 210 to the input unit 101 includes a voltage when the lamp is turned on (hereinafter referred to as “first voltage”) and a voltage when the lamp is turned off (hereinafter referred to as “first”). 2) ") and a different value.

  In the present embodiment, the brake lighting circuit 210A (see FIG. 2) that outputs a voltage signal of a first voltage lower than the second voltage generated at the input unit 101 while the lamp is turned off, and the second voltage when the lamp is turned off. Any one of the brake lighting circuit 210 </ b> B (see FIG. 3) that outputs a voltage signal having a higher first voltage is connected to the brake operation detection device 300.

  For example, as shown in FIG. 2, the brake operation detection device 300 outputs an L level ground voltage of the ground line 209 to the input unit 101 while the lamp 221A is turned on, and an H level battery while the lamp 221A is turned off. A brake lighting circuit 210A that outputs the voltage Vb to the input unit 101 is connected. Alternatively, as shown in FIG. 3, a brake lighting circuit that outputs an H level battery voltage Vb to the input unit 101 while the lamp 221B is lit and outputs an L level ground voltage to the input unit 101 while the lamp 221B is extinguished. 210B is connected to the brake operation detection device 300.

  Thus, the brake lighting circuit 210 provided in the brake operation detection device 300 outputs an L level voltage signal to the input unit 101 in the brake lighting circuit 210A shown in FIG. 2 when the side brake lever is raised. On the other hand, the brake lighting circuit 210B shown in FIG. 3 outputs an H level voltage signal to the input unit 101. That is, in the control unit 100, a voltage signal whose level is inverted by the provided brake lighting circuit 210 may be input to the input unit 101.

  The control unit 100 correctly detects the brake operation according to the lighting state of the lamp without changing the software setting of the CPU 40 even when a voltage signal having an inverted level is input to the input unit 101 from the brake lighting circuit 210B. An electronic control unit capable of

  The control unit 100 includes a signal detection unit 110 that detects a brake signal according to the lighting state of the brake lighting circuit 210, and a dip switch 10 that can be set to supply the brake signal to the signal detection unit 110 while the lamp is lit. And comprising. Further, on the substrate of the control unit 100, a substrate power supply line 11 and a ground line 19 are provided for causing the signal detection unit 110 to generate a brake signal. The ground line 19 is a second ground line used for grounding the signal detection unit 110, and the substrate power supply line 11 is a second power supply line to which a substrate voltage Vs higher than the ground line 19 is supplied.

  The signal detection unit 110 includes a photocoupler 20 that generates a brake signal, a resistance element 29 that adjusts the amount of current to the photocoupler 20, a signal generation circuit 30 that generates a detection voltage based on the brake signal flowing through the photocoupler 20, A substrate ground line 39 for grounding the signal generation circuit 30 and a CPU 40 for detecting a voltage set in the signal generation circuit 30 are provided.

  The photocoupler 20 is provided between the brake lighting circuit 210 and the signal generation circuit 30. The photocoupler 20 emits light by the voltage supplied from the brake lighting circuit 210 during lighting of the lamp, and the detection voltage generated by the brake signal in the signal generation circuit 30 when receiving light from the light emitting element 21. And a light receiving element 22 for setting. For example, the light emitting element 21 is realized by a light emitting diode or the like, and the light receiving element 22 is realized by a phototransistor or a photodiode.

  The photocoupler 20 includes a first input terminal to which a light emission voltage is supplied to one end on the anode side of the light emitting element 21, and a second input terminal to which the other end on the cathode side of the light emitting element 21 is grounded to the ground line 19 or 209. Have. The photocoupler 20 includes a first output terminal in which one end of the light receiving element 22 is connected to the signal generation circuit 30 and the CPU 40, and a second output terminal in which the other end of the light receiving element 22 is grounded to the substrate ground line 39. Have. In general, the impedance of the ground line 19 and the ground line 209 is lower than the impedance of the substrate ground line 39 of the signal detection unit 110.

  The signal generation circuit 30 includes a voltage line 31 that supplies a set voltage Vu that generates a brake signal to the light receiving element 22, and a resistance element 32 that applies a detection voltage dropped by the brake signal to the CPU 40. When a brake signal current flows from the voltage line 31 to the light receiving element 22 in response to a brake execution command, the signal generation circuit 30 outputs an L level detection voltage generated by the voltage drop in the resistance element 32 to the CPU 40. On the other hand, when the brake signal does not flow to the light receiving element 22 due to the brake release command, the signal generation circuit 30 outputs the H level set voltage Vu supplied from the voltage line 31 to the CPU 40. The voltage line 31 is a power supply line to which a set voltage Vu of 5V is supplied, for example.

  The CPU 40 is a digital circuit that constitutes a voltage detection unit that detects a voltage generated in the resistance element 32. When receiving the L level detection voltage from the resistance element 32, the CPU 40 determines that the brake operation has been performed, and executes a brake operation process performed when the vehicle is stopped. Further, when the CPU 40 receives the H level set voltage from the signal generation circuit 30, it determines that the brake operation has been released and stops the brake operation process.

  The dip switch 10 includes switches 1 to 4 that can switch an input terminal and an output terminal to a connected state or a disconnected state. Each of the switches 1 to 4 is a switch unit that is set to a connected state or a blocked state by a user's manual setting. Hereinafter, the connection state between the input terminal and the output terminal is referred to as ON, and the cutoff state is referred to as OFF.

  An input terminal of the switch 1 is connected to the substrate power supply line 11 that supplies a light emission voltage to the light emitting element 21, and an output terminal of the switch 1 is connected to one end of the resistance element 29. The other end of the resistance element 29 is connected to the anode electrode of the light emitting element 21.

  The input terminal of the switch 2 is connected to the input unit 101 of the control unit 100, and the output terminal of the switch 2 is connected to the cathode electrode of the light emitting element 21.

  The input terminal of the switch 3 is connected to the input unit 101 of the control unit 100 together with the input terminal of the switch 2, and the output terminal of the switch 3 is connected to one end of the resistance element 29 together with the output terminal of the switch 1.

  The input terminal of the switch 4 is connected to the ground line 19 having a lower impedance than the substrate ground line 39, and the output terminal of the switch 4 is connected to the cathode electrode of the light emitting element 21 together with the output terminal of the switch 2.

  In the present embodiment, the setting state of the dip switch 10 when the brake lighting circuit 210A shown in FIG. 2 is provided in the brake operation detecting device 300 is shown. As shown in FIG. 2, in the dip switch 10, the switch 1 and the switch 2 are set to ON, and the switch 3 and the switch 4 are set to OFF.

  That is, when the brake lighting circuit 210A outputs the ground voltage of the ground line 209 lower than the battery voltage Vb to the input unit 101 when the lamp 221A is lit, the substrate voltage Vs for generating the brake signal is detected. As the first switch unit set in the unit 110, both the switch 1 and the switch 2 are set to ON.

  Therefore, the first terminal 111 of the signal detection unit 110 connected to the resistance element 29 is connected to the substrate power line 11 by the switch 1, and the signal detection unit is connected to the cathode electrode of the light emitting element 21 by the switch 2. The second terminal 112 of 110 is connected to the contact 212 of the brake lighting circuit 210A. On the other hand, the switch 3 is turned off so that the contact 212 of the brake lighting circuit 210A and the first terminal 111 of the signal detection unit 110 are disconnected, and the switch 4 is connected to the second terminal 112 of the signal detection unit 110 and the ground line. 19 is turned off so as to be shut off.

  On the other hand, when the brake lighting circuit 210B shown in FIG. 3 is provided in the brake operation detecting device 300, the switch 1 and the switch 2 are set to OFF and the switch 3 and the switch 4 are set to ON. Is done.

  That is, when the brake lighting circuit 210B outputs a battery voltage Vb higher than the ground voltage of the ground line 209 to the input unit 101 when the lamp 221B is lit, the battery voltage Vb is a voltage that generates a brake signal. As a second switch unit set in the signal detection unit 110, both the switch 3 and the switch 4 are set to ON.

  For this reason, the switch 3 connects the contact point 212 of the brake lighting circuit 210B to the first terminal 111 of the signal detection unit 110, and the switch 4 connects the second terminal 112 of the signal detection unit 110 to the ground line 19. . On the other hand, the switch 1 is turned off so that the substrate power line 11 and the first terminal 111 of the signal detection unit 110 are disconnected, and the switch 2 is connected to the second terminal 112 of the signal detection unit 110 and the brake lighting circuit 210B. The contact 212 is turned off so as to be disconnected.

  Thus, in the brake operation detection device 300, when the brake lighting circuit 210A shown in FIG. 2 is connected, both the switches 1 and 2 are set to ON, and the brake lighting circuit 210B shown in FIG. 3 is connected. When both the switches 3 and 4 are turned ON, the brake signal is supplied to the signal detection unit 110 when the lamp is lit in accordance with the brake lighting circuit 210A or B provided in the brake operation detecting device 300. Is possible. Next, a specific operation of the brake operation detection device 300 will be described with reference to FIGS.

  FIG. 2 is a circuit diagram showing a brake operation detecting device 300 provided with a brake lighting circuit 210A that outputs an L level while the lamp 221A is turned on and outputs an H level when the lamp 221A is turned off. In the following, the same components as those in FIG. 1 are denoted by the same reference numerals and detailed description thereof is omitted. In the DIP switch 10, the connection state of the switches 1 to 4 is schematically shown, and both the switch 1 and the switch 2 are set to ON, and both the switch 3 and the switch 4 are set to OFF.

  The brake lighting circuit 210A includes a lamp 221A that displays the brake state of the side brake, a switch 222A that switches the lamp 221A on and off according to the brake operation, a contact 212 that connects the lamp 221A and the switch 222A, Is provided.

  The lamp 221A is a brake lamp that is turned on when the side brake lever is raised and is turned off when the side brake lever is lowered. One end of the lamp 221A is connected to the battery power line 201, and the other end of the lamp 221A is connected to the contact 212 and the input unit 101.

  The switch 222 </ b> A connects or disconnects the input unit 101 and the ground line 209 in accordance with an input signal from the brake line 211. The switch 222A is realized by, for example, a semiconductor switch element or a relay.

  When the switch 222A receives an H level input signal as a brake execution command from the brake line 211, the switch 222A connects the ground line 209 to the other end of the lamp 221A and the cathode electrode of the light emitting element 21. As a result, a lighting voltage is supplied from the battery power supply line 201 to the lamp 221 </ b> A, and a light emission voltage is supplied from the substrate power supply line 11 to the light emitting element 21. That is, the switch 222A supplies a current for generating a brake signal from the substrate power line 11 to the light emitting element 21 via the first terminal 111 of the signal detection unit 110 while the lamp 221A is turned on.

  Further, when the switch 222A receives an L level input signal as a brake release command from the brake line 211, the switch 222A switches the other end of the lamp 221A and the light emitting element 21 from the ground line 209. As a result, the supply of the lighting voltage to the lamp 221A is stopped, and the light emission voltage from the substrate power supply line 11 to the light emitting element 21 becomes almost 0 V, so that the light emitting element 21 does not emit light. That is, the switch 222A stops supplying current from the substrate power supply line 11 to the signal detection unit 110 while the lamp 221A is turned off.

  Next, the operation of the brake operation detecting device 300 when the side brake lever is raised will be described.

  When the side brake lever is raised and an H level input signal is received from the brake line 211, the brake lighting circuit 210A is in the connected state, the lighting voltage is supplied to the lamp 221A, and the lamp 221A is lit. A ground line 209 is connected to the input unit 101.

  When the input unit 101 and the ground line 209 are connected, a light emission voltage is supplied from the substrate power supply line 11 to the light emitting element 21 via the resistance element 29. As a result, a current as a brake signal flows from the substrate power supply line 11 to the ground line 209 to the light emitting element 21, and light is emitted from the light emitting element 21.

  When the light from the light emitting element 21 is received by the light receiving element 22, the signal generating circuit 30 is connected to the substrate ground line 39 by the light receiving element 22, and the current flowing from the voltage line 31 to the light receiving element 22 serves as a brake signal as the substrate ground line. 39 is output. At this time, the CPU 40 is supplied with a detection voltage obtained by dropping the voltage from the set voltage Vu by the resistance element 32 as an L level detection signal.

  Next, the operation of the brake operation detection device 300 when the side brake lever is lowered will be described.

  When the side brake lever is lowered and the brake lighting circuit 211A receives an L level input signal from the brake line 211, the switch 222A is turned off, the supply of the lighting voltage to the lamp 221A is stopped, and the lamp 221A is turned off. While the light is turned off, the ground line 209 is disconnected from the input unit 101. Therefore, the input unit 101 increases from the L level ground voltage to the H level battery voltage Vb.

  When the voltage of the input unit 101 increases to the battery voltage Vb, the voltage of the input unit 101 with respect to the substrate voltage Vs of the substrate power supply line 11 becomes substantially 0 V compared to the light emission voltage of the light emitting element 21, so that light is emitted from the substrate power supply line 11. No current flows through the element 21.

  For this reason, no light is emitted from the light emitting element 21, and no current flows from the voltage line 31 to the light receiving element 22 via the resistance element 32. Therefore, the set voltage Vu set in the resistance element 32 from the voltage line 31 is supplied to the CPU 40 as an H level detection signal. When the CPU 40 receives the H level detection signal applied from the resistance element 32, the CPU 40 stops the brake operation process.

  FIG. 3 is a circuit diagram showing a brake operation detecting device 300 provided with a brake lighting circuit 210B that outputs an H level while the lamp 221B is turned on and outputs an L level when the lamp 221B is turned off. In FIG. 3, in the dip switch 10, both the switch 1 and the switch 2 are set to OFF, and both the switch 3 and the switch 4 are set to ON. One end of the lamp 221B is connected to the input unit 101, and the other end of the lamp 221B is connected to the ground line 209.

  The brake lighting circuit 210B includes a lamp 221B that displays the brake state of the side brake, a switch 222B that switches the lamp 221B on and off according to the brake operation, a contact 212 that connects the lamp 221B and the switch 222B, Is provided.

  The switch 222B connects or disconnects the input unit 101 and the battery power line 201 in accordance with an input signal from the brake line 211.

  When the switch 222B receives an H-level input signal as a brake execution command from the brake line 211, the switch 222B places the battery power line 201 in a connection state between one end of the lamp 221B and the anode electrode of the light emitting element 21. Thereby, a lighting voltage is supplied from the battery power supply line 201 to the lamp 221 </ b> B, and a light emission voltage is supplied from the battery power supply line 201 to the light emitting element 21 via the resistance element 29. That is, the switch 222B supplies a current for generating a brake signal from the battery power line 201 to the light emitting element 21 via the first terminal 111 of the signal detection unit 110 while the lamp 221B is turned on.

  Further, when the switch 222B receives an L-level input signal as a brake release command from the brake line 211, the switch 221B turns off the lamp 221B and the light emitting element 21 from the battery power line 201. Thereby, the supply of the lighting voltage from the battery power supply line 201 to the lamp 221B is stopped, and the ground voltage of the ground line 209 is supplied to the light emitting element 21, so that the light emitting element 21 does not emit light. That is, the switch 222B stops the supply of current from the battery power line 201 to the signal detection unit 110 while the lamp 221B is turned off.

  Next, the operation of the brake operation detecting device 300 when the side brake lever is raised will be described.

  When the side brake lever is raised and an H level input signal is received from the brake line 211, the brake lighting circuit 210B is connected to the switch 222B, the lighting voltage is supplied to the lamp 221B, and the lamp 221B is lit. The battery power line 201 is connected to the input unit 101.

  When the input unit 101 and the battery power line 201 are connected, a light emission voltage is supplied from the battery power line 201 to the light emitting element 21 via the resistance element 29. Thereby, a current for generating a brake signal from the battery power supply line 201 to the ground line 19 flows to the light emitting element 21, and light is emitted from the light emitting element 21.

  When light from the light emitting element 21 is received by the light receiving element 22, the signal generating circuit 30 is connected to the substrate ground line 39 by the light receiving element 22, and a brake signal flowing from the voltage line 31 to the resistance element 32 is sent to the substrate ground line 39. Is output. As a result, an L level detection voltage is supplied to the CPU 40 due to a voltage drop generated in the resistance element 32. When the CPU 40 receives the L level detection voltage set in the signal generation circuit 30, the CPU 40 executes a brake operation process.

  Next, the operation of the brake operation detection device 300 when the side brake lever is lowered will be described.

  When the side brake lever is lowered and the brake lighting circuit 210B receives an L level input signal from the brake line 211, the switch 222B is cut off, the supply of the lighting voltage to the lamp 221B is stopped, and the lamp 221B is turned off. While the light is turned off, the battery power line 201 is disconnected from the input unit 101. Therefore, in the input unit 101, the voltage decreases from the H level battery voltage Vb to the L level ground voltage.

  When the input unit 101 is lowered to the ground voltage, the voltage of the input unit 101 with respect to the ground line 19 becomes substantially 0 V as compared with the light emission voltage of the light emitting element 21, so Current stops flowing.

  For this reason, no light is emitted from the light emitting element 21, and no current flows from the voltage line 31 to the light receiving element 22 via the resistance element 32. Therefore, the CPU 40 is supplied with the H level set voltage Vu set to the resistance element 32 from the voltage line 31. When the CPU 40 receives the H level detection signal set in the signal generation circuit 30, the CPU 40 stops the brake operation process.

  According to the above embodiment, there exist the effects shown below.

  In the brake operation detection device 300, the light emitting element 21 emits light by the voltage output from the brake lighting circuit 210 while the lamp is lit, and the light receiving element 22 that receives light from the light emitting element 21 becomes the resistance element 32 of the signal generation circuit 30. The detected voltage that has dropped the voltage at the resistance element 32 when the brake signal is supplied is set in the CPU 40.

  Therefore, by providing the photocoupler 20 between the brake lighting circuit 210 and the signal generation circuit 30, the brake lighting circuit 210 on the light emitting element 21 side, the signal generation circuit 30 on the light receiving element 22 side, and the CPU 40 are electrically connected. Will be separated. Therefore, even if the impedance of the substrate ground line 39 connected to the signal generation circuit 30 and the CPU 40 is higher than the impedance of the ground line 19 or 209 on the brake lighting circuit 210 side, the brake operation detection device shown in FIG. It is possible to prevent current from flowing from the input unit 101 to the brake lighting circuit 210. Therefore, erroneous lighting of the brake lighting circuit 210 can be prevented.

  In the present embodiment, as the light emitting element 21 and the light receiving element 22, a photocoupler 20 including a light emitting diode and a phototransistor is provided in the control unit 100.

  For this reason, the brake operation detection device 300 in which the brake lighting circuit 210 on the light emitting element 21 side, the signal generation circuit 30 on the light receiving element 22 side, and the CPU 40 are electrically separated is realized with a relatively inexpensive and simple configuration. be able to.

  The present invention is not limited to the above-described embodiment, and it is obvious that various modifications can be made within the scope of the technical idea.

10 DIP switch 11 Substrate power line 19, 209 Ground line 20 Photocoupler 21 Light emitting element 22 Light receiving element 29, 32 Resistance element 30 Signal generation circuit 31 Voltage line 39 Substrate ground line 40 CPU
DESCRIPTION OF SYMBOLS 100 Control unit 101 Input part 110 Signal detection part 201 Battery power supply line 210, 210A, 210B Brake lighting circuit 221A, 221B Lamp 222A, 222B Switching device 300 Brake operation detection apparatus

Claims (3)

A lighting circuit that lights the lamp in response to the brake operation;
A signal generation circuit for generating a brake signal in response to a brake operation;
A light emitting element that is provided between the lighting circuit and the signal generation circuit and emits light according to a voltage output from the lighting circuit when the lamp is turned on;
A light receiving element that sets a voltage corresponding to the brake signal in the signal generation circuit when receiving light from the light emitting element;
A brake operation detection device comprising: a voltage detection unit that detects a voltage set in the signal generation circuit. The light emitting element is a light emitting diode,
The brake operation detection device according to claim 1, wherein the light receiving element is a phototransistor or a photodiode. The signal generation circuit includes a voltage line to which a voltage for generating the brake signal is supplied, and a resistance element that applies a voltage dropped by the brake signal to the voltage detection unit,
When the lighting circuit receives a brake execution command by a brake operation, the light emitting element emits light,
3. The light receiving element according to claim 1, wherein when the light receiving element receives light from the light receiving element, the resistance element is changed from an ungrounded state to a grounded state and a brake signal is sent from the power supply line to the resistive element. The brake operation detection device described.

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