JPH0647335B2 - Vehicle hood opening / closing device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a vehicle hood opening / closing device for opening and closing a vehicle hood.

"Prior Art" As a conventional vehicle hood opening / closing device, a manual device and a hydraulic device are known. However, the manual device requires a large operating force, and is not suitable for women in particular. In addition, the hydraulic device requires a hydraulic pump, an operating cylinder, and the like, and the hood opening / closing system becomes large. Also, U.S. Pat. No. 3,116,087 discloses a device for opening and closing a hood by means of a motor. However, an opening / closing member interlocking with the motor rotates beyond a predetermined position due to a malfunction of a position limiting switch. In such a case, a double safety device is not provided, which poses a problem of danger.

[Problems to be Solved by the Invention] The present invention has been made to solve the above problems, and a drive shaft rotated by a motor via a speed reduction mechanism rotates beyond a predetermined position. It is an object of the present invention to provide a safe hood opening / closing device for a vehicle, which is capable of restricting the power consumption and automatically stopping the energization of the motor.

[Means for Solving the Problems] According to the present invention, the drive shafts provided on both the left and right sides of the vehicle are rotated by the reduction mechanism, and the switching is performed to switch the rotation direction of the motor. A relay, a switching relay driving transistor for switching and driving the switching relay, a hood opening command switch and a hood closing command switch for instructing opening or closing of the hood, and a hood opening command switch and a hood closing command. The motor is provided with an opening / closing command determining means for determining which of the switches has been operated, an operating means for opening and closing the canopy when either the hood opening command switch or the hood closing command switch is operated. A rotation synchronization sensor that emits a pulse in synchronization with the rotation of the motor, and a machine that limits rotation of a drive shaft that is rotated by the motor via a speed reduction mechanism. A mechanical stopper, a motor lock detection means for detecting the lock of the motor by detecting the width of the pulse generated by the rotation synchronization sensor, and the operation of the operation means when the signal of the motor lock detection means is present A vehicle hood opening / closing device is provided, which is provided with:

[Operation] According to the above configuration, when the drive shaft is rotated beyond a predetermined position due to some cause, for example, a limit switch failure, a hood opening / closing member such as a crank arm connected to the drive shaft is mechanically operated. The rotation of the drive shaft is forcibly restrained, and the rotation speed of the motor is reduced by locking the motor, so that the pulse width of the rotation synchronization sensor is widened and the motor lock detecting means is provided. When a signal is output from the motor, the operation stopping means automatically shuts off the power supply to the motor and stops the opening operation of the hood.

[Embodiment] Next, an embodiment of the vehicle hood opening / closing device of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the vehicle hood opening / closing apparatus of the present embodiment has an operating circuit 200 having a control microcomputer 1 as a main element and a first motor drive having a first motor 2 as a main element. A circuit 300, a second motor drive circuit 400 having the second motor 3 as a main element, and a hood opening command switch 4 and a hood closing command switch 5 for instructing opening or closing of the hood 120. And a hood opening / closing command switch circuit 500. The switches 4 and 5 are push button switches and are closed only when operated.

In the operating circuit 200, reference numerals 6, 7, 8, 9 are input protection diodes of the control microcomputer 1 (hereinafter simply referred to as MPU 1), and terminals 1 of the input section of the operating circuit 200.
Protecting MPU1 by shorting the input ports SW4 and SW6 of MPU1 with diodes 6 and 7 when a positive surge is applied to 0 and 11 and shorting with diodes 8 and 9 when a negative surge is applied. is doing. Reference numerals 14, 15, 16, and 17 are also input protection diodes, and negative-direction surges to the terminals 12 and 13 of the input part of the operating circuit 200 are shorted by the diodes 15 and 17, and positive-direction surges from the terminals 12 and 13 are diode. The input ports SW3 and SW5 of the MPU1 are protected by short-circuiting with 14 and 16. Resistors 18, 19, 20, 2
Reference numerals 1 and 22 are pull-up resistors. The resistor 23 and the capacitor 24, and the resistor 25 and the capacitor 26 are an integrating circuit that eliminates noise due to chattering of the rotation synchronization sensors 27 and 28. The resistors 29 and 30 are protection resistors for the input ports SW5 and SW3 of the MPU1. The capacitor 31 connected to the reset port RST of the MPU 1 is a power-on reset capacitor, and the charging resistance is MPU.
1, the diode 32 is a discharging diode for the capacitor 31. Reference numeral 33 is a ceramic oscillator that generates a clock signal for operating the MPU 1, and 34 and 35 are capacitors for stabilizing the oscillation of the ceramic oscillator 33. The resistor 36 and the Zener diode 37 connected to the power supply input port VDD of the MPU 1 are normally connected to the power supply terminal 43.
It constitutes a constant voltage circuit for producing a voltage (5V) for operating the MPU 1 from a vehicle power supply voltage of 2V. Three
Reference numeral 8 is a stabilizing capacitor, and 39 is a high frequency noise cutting capacitor which is a high frequency capacitor such as a ceramic capacitor. The ceramic buzzer 40 connected to the power supply terminal 43 is a buzzer for notifying the operator of the operating state of the hood opening / closing device. The buzzer 40 is connected in series with the collector of the driving transistor 41, and the transistor 4
1 base is MPU via base current limiting resistor 42.
1 is connected to the buzzer output port BZ. The Zener diode 44 and the resistor 45 connected to the input terminal 46 of the operating circuit 200 are connected to the hood opening / closing command switch circuit 500.
It constitutes a circuit for detecting the closing of the hood opening command switch 4, and the voltage of the power supply electrode (+) of the vehicle is applied to the terminal 46 when the hood opening and closing command switch 4 is closed. Therefore, it is a constant voltage circuit for setting the same voltage as the operating power supply of the MPU 1. The capacitor 47 connected in parallel with the Zener diode 44 constitutes a noise prevention integrating circuit, and is connected to the non-grounded end of the Zener diode 44 and MP.
A resistor 48 for input protection is connected between the input port O / C of U1, and in parallel with the Zener diode 44, a low voltage (hereinafter simply referred to as L) is constantly applied to the port O / C. Is connected to the pull-down resistor 49. The transistor 50 whose base is connected to the output port FET1 of the MPU1 via the base resistor 51 and the transistor 52 whose base is connected to the output port FET3 via the base resistor 53 are the output port FET1 and the output of the MPU1. A level conversion transistor for converting the on / off of the voltage of the port FET 3 into the on / off of the vehicle power supply voltage.
The collector outputs of 2 are connected to the output terminals 54 and 55 of the actuation circuit 200 via resistors 56 and 57, respectively. The collectors of the transistors 50 and 52 are connected to the power supply terminal 43 via collector resistors 58 and 59, respectively. The resistors 56 and 57 and the motor drive circuit 30
Zener diodes 60 and 61 built into 0,400
The hood opening / closing device of the present embodiment operates even if it is not provided, but the field effect transistor 62 of the motor drive circuits 300 and 400
63, 64, and 65 are voltage-operated elements, and since almost no gate current flows, the terminal 5 of the lead wire in the vehicle is
Since poor contact is apt to occur in the sections 4, 55, the resistors 56, 57 and the Zener diodes 60, 61 cause a current of about several mA to flow to the terminals 54, 55 when the transistors 50, 52 are off. The contact failure of the connector at 55 is prevented.

A vehicle speed signal is introduced into the vehicle speed signal terminal 67 of the operation circuit 200 when the vehicle starts traveling. The diode 66 connected between the vehicle speed signal terminal 67 and the vehicle speed signal input port SP of the MPU 1 receives the on / off signal of the normal vehicle power supply (12V) as the vehicle speed signal.
The voltage of 12V is prevented from being applied to the input port SP of. Transistors 68 and 6 connected to output ports R24 and R13 of the MPU 1 through base resistors 70 and 71
Reference numeral 9 is a level conversion transistor for converting an on / off signal at the ports R24 and R13 of the MPU 1 into an on / off signal of a vehicle power supply voltage of 12V, and collectors of the transistors 68 and 69 are collector resistors 7 and 7.
It is connected to the power supply terminal 43 via 2, 73. The relay driving transistors 74, 75, 76, 77 are transistors for energizing the switching relay coils 90, 91, 92, 93, respectively, and their emitters are all connected to the power supply terminal 43 and their collectors are output terminals 78. , 7
9, 80 and 81, the bases of the transistors 74 and 76 are connected to the collector of the level converting transistor 69 via the base resistors 82 and 84, and the bases of the transistors 75 and 77 are the base resistors 8 and 8.
It is connected to the collector of the level conversion transistor 68 through 3,85. Relay drive transistor 7
Diodes 86, 87, 88, 89 inserted between the collectors of 4, 75, 76, 77 and the ground are switching relay coils 90, 91, 92 of the motor drive circuits 300, 400.
The reverse voltage generated from 93 is absorbed. The diode 94 inserted between the power supply terminal 43 and the ground is a diode for absorbing a reverse voltage that similarly enters the power supply line.

The motors 2 and 3 of the motor drive circuits 300 and 400 are direct current ferrite motors, and each of the armatures has a rotation synchronization sensor 27 or 28 such as a photocoupler that is turned on and off once for each rotation of the armature. . Further, the motor 2 and the motor 3 have a speed reduction mechanism composed of a multi-stage gear train including a worm gear mechanism, and the drive shafts 96, 97 of the hood 120, which is the final output shaft thereof, have position detection switches 98, 99. ing. High frequency coils 100, 101, 102, 1 connected in series with the motors 2, 3.
03 and capacitors 104, 105, 106, and 107 inserted between the power supply side of these coils and the ground prevent spark noise emitted from the brushes of the motors 2 and 3 from entering the radio or the like. Field effect transistors 62, 6
Reference numerals 3, 64 and 65 are motor disconnecting transistors for switching the motors 2 and 3 for speed adjustment and the like.
The sources and drains of the field effect transistors 62, 63, 64, 65 are switching relay contacts 108, 109, 110.
It is inserted between the normally closed terminal NC of 111 and the ground, and its gate is connected to terminals 54 and 55, respectively. Switching relay contacts 108 and 109 and switching relay contacts 110 and 11
The common terminal COM of No. 1 is the high frequency coils 100, 101,
It is connected to the motors 2 and 3 via 102 and 103, and these switching relay contacts 108, 109 and 110.1.
The 11 normally open terminal NO is connected to the power terminal 112. The switching relay contacts 108/109, 110/11
1 and the switching relay coils 90, 91, 92, 93 constitute a switching relay for switching the rotation directions of the motors 2, 3.

In the motor drive circuit 400, the diodes 113 and 114 connecting the upper and lower sides of the motor 3 and the power supply terminal 43 prevent the armature of the motor 3 from being short-circuited, and the brush of the motor 3 supplies electric power to the operation circuit 200. Diode 11 connecting the hood release command switch 4 and the switching relay coil 92
5 and the diode 116 connecting the hood closing command switch 5 and the switching relay coil 93, these command switches 4,
Field effect transistors 64, 6 when 5 is closed
When 5 is turned off, the generated voltage of the motor 3 is applied to the power supply terminal 43, which blocks the current flowing into the vehicle power supply through the transistors 75, 77 or the emitters and collectors of the transistors 74, 76, and the transistors 75, 77, 7
Prevent the destruction of 6,74. Field effect transistor 62
・ Motor 2, when switching 63 and 64 ・ 65
Varistors 117 and 118 are respectively connected in parallel with the sources and drains of the field effect transistors 62, 63 and 64, 65 in order to absorb the reverse voltage generated from the transistor 3.

As shown in FIGS. 2 (a) and 2 (b), a hard top 120 is provided on top of the vehicle 119, following the front window glass 121.
A hood 120 including a and a soft top 120b is provided. The hood 120 is mounted on the crank arm 1 by means of drive shafts 96, 97 provided on both left and right sides of the vehicle 119.
22, first link rod 123, collapsible pillar 124,
Second link rod 125 and forming bar 12
It can be opened and closed via 6. A hinge bracket 127 is fixed to the vehicle 119, and a tiltable pillar 124 and a second link rod 125 are rotatably hinged to the hinge bracket 127. A rear window glass 128 is provided on the soft top 120b. As shown in FIG. 2B, the hard top 120
a can be manually turned. The two motors 2 and 3 respectively rotate both drive shafts 96 and 97 via the speed reduction mechanism as described above. The position detection switches 98 and 99 are the hood 1
The switch 20 is turned off while the switch 20 is being opened or closed, and is turned on 10 ° before the open or closed end.

As shown in FIG. 3 (a), the motors 2 and 3 are connected to the armatures 2a and 3a through a reduction mechanism, and a drive shaft 9 is connected.
6 and 97, a crank arm 122 is connected to the drive shafts 96 and 97, and a limit switch operating cam 130 whose operating position is adjustable is attached. A limit switch actuating cam 13 is provided for the motors 2 and 3.
A limit switch 131 cooperating with 0 is attached, and when the crank arm 122 reaches the open working end,
Limit switch operating cam 130 is limit switch 1
The power of the motors 2 and 3 is opened by touching 31. However, if the limit switch 131 fails, the crank arm 122 may overrun and the rear window glass 128 or the like may be damaged due to the opening operation of the tiltable pillar 124. Therefore, in the present embodiment, the motor 2, 3, a mechanical stopper 132 having a substantially L-shaped cross section is fixedly provided to forcibly restrain the rotation of the crank arm 122. In the present embodiment, the control microcomputer 1 will be described later.
The actuating circuit 200, whose main element is, has a lock detecting function so that the motors 2 and 3 are turned off when the motors 2 and 3 are restrained for 3 seconds or more. Rotation synchronizing sensors 27 and 28 by photocouplers are provided on the rotation shafts of the armatures 2a and 3a.

As shown in FIG. 3B, the final output stage gear 96 directly connected to the drive shafts 96 and 97 is provided inside the motors 2 and 3.
Position detection switches 98 and 99 are provided behind a and 97a.

"Operation" FIG. 4 showing the program of the MPU 1 and the timing chart at the time of motor lock shown in FIG.
The operation will be described with reference to FIGS.

FIG. 1 shows the state when the circuit does not operate. At this time, the hood opening command switch 4 and the hood closing switch 5 are opened, and the voltage is applied from the power terminal 112 to the normally open contacts NO of the switching relay contacts 108, 109, 110, 111. Therefore, since the voltage of the positive electrode of the vehicle power source is not supplied to the motors 2, 3 and the power source terminal 43 of the operating circuit 200, the motors 2, 3 do not malfunction due to noise or the like. Now here, hood 120 of vehicle 119
Will be described when the hood opening command switch 4 is pressed to open the hood 120. When the hood opening command switch 4 is closed, a current flows from the positive electrode of the power supply to the ground through the switch 4, the diode 115, and the relay coil 92, the switching relay contact 110 is turned on, and its common terminal COM contacts the normally open contact NO. To do. When the switching relay contact 110 is turned on, the power supply positive electrode moves to the power terminal 11
2, power is supplied to the power supply terminal 43 from the normally open contact NO of the switching relay contact 110, the common terminal COM, the high frequency coil 102 and the diode 113, and the operating circuit 200 operates. The MPU 1 is reset when the capacitor 31 is charged from the ground side when power is supplied to the power supply terminal 43 and the voltage application to the RST port is delayed from the VDD port. At this reset, the output ports R13, R24, FET3, FET1 and BZ of the MPU1 are all at a low potential (hereinafter, the low potential is simply referred to as "L" and the high potential is referred to as "H").
, The transistors 41, 50, 52 and the transistors 68, 69 are all turned off, and the transistors 68, 69 are turned off, so that the transistors 74, 7
5,76,77 are turned off. At this time, the MPU 1 first initializes each flag and counter in step 600, and then checks whether the vehicle speed signal has risen from "L" to "H" by the loop of steps 601 and 602. After the hood open command switch 4 (or hood close command switch 5) is pressed for 0.5 seconds or longer, step 60
Go to 4. This loop receives the traveling wind on the hood 120 due to the malfunction of the hood opening / closing device when the switch 4 or the switch 5 is erroneously touched and the hood 120 opening (or closing) when the vehicle travels, and the traveling of the vehicle 119. To prevent instability. Next, at step 604, it is judged which of the hood opening command switch 4 and the hood closing switch 5 is pressed. When the hood opening command switch 4 is closed as shown in the example, the diode 115 is released from the switch 4.
A voltage is applied to the input port O / C of the MPU 1 via the and terminal 46, and the port O / C becomes “H”. When the hood closing command switch 5 is closed and the hood opening command switch 4 is open, the port O / C is set to "L" by the pull-down resistor 49. When the input port O / C is "H", the open flag is set in step 605. In the next step 606, it is determined whether the vehicle speed flag is set, and if the result is positive, the process returns to step 600 and the following operations are not performed. That is, the hood 120 is not opened or closed while the vehicle 119 is traveling. If the result of the determination in step 606 is negative, it is determined in step 607 whether or not the open flag is set. In this example, a positive result is obtained, so that the output port R13 of the MPU 1 is determined in step 608. The level conversion transistor 69 is turned on, the switching relay driving transistors 74 and 76 are turned on, and the switching relay coils 90 and 92 are turned on by the current from the output terminals 78 and 80.
The common terminal COM of the switching relay contacts 108 and 110 is connected to the normally open terminal NO. Then, the switching relay contact 11
Since the voltage is supplied from the positive electrode of the vehicle power source to the power source terminal 43 through the common terminal COM, the high frequency coil 102, and the diode 113 from the normally open terminal NO of 0, the operating circuit 2
The relay driving transistors 74 and 76 of 00 are maintained in the ON state, and the switching relay coils 90 and 92 are self-held. Therefore, even if the hand is released 0.5 seconds after the hood opening command switch 4, the voltage is continuously supplied to the power supply terminal 43 of the operating circuit 200.

Contrary to the case of the example, when the hood closing command switch 5 is closed, the switching relay coil 91 and the switching relay coil 93 operate in the same manner to perform self-holding, and the switching relay contacts 109, 111. Since the common terminal COM of is connected to the normally open terminal NO, the currents flowing through the motors 2 and 3 are reversed, so that the rotation directions of these motors 2 and 3 are the same as those when the hood opening command switch 4 is closed. The opposite is true.

In step 610, the output port FE of MPU1
By turning T1 and FET3 to "L" and turning off the level converting transistors 50 and 52, the field effect transistors 62 and 63 and the field effect transistors 64 and 6 are output from the output terminals 54 and 55 of the operating circuit 200.
These field effect transistors 62 to 65 are turned on by applying a voltage to the gates of the transistors 5, respectively. Therefore, the lower side of the motors 2 and 3 is the high frequency coil 10.
1, 103, common terminals COM of switching relay contacts 109, 111, normally closed terminals NC, and field effect transistor 6
By being grounded via the sources and drains of 2.63 and 64.65, the motor 2 and the motor 3 start rotating in the positive direction, and the drive shafts 96 and 9 are driven via the reduction mechanism.
7, the crank arm 122, the first link rod 123, the collapsible pillar 124, and the second link rod 1 are rotated.
The hood 120 starts to be opened via 25 and the forming bar 126.

In step 611, the buzzer 40 is intermittently turned on and off at 0.5 second intervals to notify that the hood is open (or closed). When the output port BZ of the MPU 1 is set to "H", the driving transistor 41 is turned on and the ceramic buzzer 40 sounds, and when the output port BZ is set to "L", the driving transistor 41 is turned off and the buzzer 40 is turned on. Stops blowing.

Next, in step 612, the rotation speed of the motor 2 becomes faster than the rotation speed of the motor 3, so that the rotation synchronization sensor 2
It is judged from the signals to the input ports SW4 and SW6 whether or not the potential of the terminal 10 from 7 rises from "L" to "H". If it rises, the internal counter I of the MPU 1 is incremented by +1.
However, the difference between the internal counter I that counts the pulses from the input port SW4 and the internal counter II that counts the pulses from the input port SW6 becomes 2 or more, and the internal counter I
When the value of is larger, the output port FET1 of MPU1 is set to "H". As a result, the level converting transistor 50 is turned on, the potential of the output terminal 54 becomes "L", the field effect transistors 62 and 63 are turned off, and the current to the motor 2 is cut off. The rotation speed is reduced. Since the output port FET3 of the MPU1 is "L", the level conversion transistor 52 continues to be in the off state, and the output terminal 55 is "H" so that the field effect transistors 64 and 65 are kept in the on state. The rotation speed of the motor 2 is synchronized with the rotation speed of 3. In step 616, it is similarly determined whether or not the sync pulse of the motor 3 is rising. If the result is positive, similar processing is performed in steps 617, 618 and 619 to perform sync correction. In the process of step 619, contrary to the above, the output port FET3 of the MPU1 is set to "H" and the output port FET1 is set to "L", so that the rotation speed of the motor 3 is synchronized with the rotation speed of the motor 2. In this way, since the motors 2 and 3 are always operated in synchronization, the hood 120 is not inclined and is opened parallel to the left and right sides of the vehicle 119.
When it is determined in step 614 and step 618 that the difference between the internal counters I and II is less than 2, the motor 2,
3 is rotated again. In this embodiment, the difference between the counters I and II is 2 so that both motors 2 and 3 are not always turned on and off.
In the above case, the synchronization correction is performed.

In step 620, first, the position detection switches 98, 9
It is determined whether the potential of the terminal 12 or the terminal 13 has changed from "H" to "L" by turning on any of the terminals 9. When the result of the determination in step 620 is positive, the hood 120
Step 6 because either the left or right side of the left side is 10 ° away from the closed end or reaches 10 ° before the open end.
21 the position detection switch 9 of the motors 2 and 3
The field effect transistors 62 and 63 or the field effect transistor 6 of the motors 2 and 3 on the side where 8,99 are turned on.
4.65 is turned off, and the field effect transistors 62.63 or 64.65 are kept off until the position detection switches 99, 98 of the other motors 3, 2 change from off to on. The positions of the drive shafts 96 and 97 are corrected.

In step 622, it is determined whether or not the vehicle speed signal has risen. If the result of the determination is positive, it means that the vehicle 119 has started to run due to the hood 120 being opened to the target position. Therefore, in step 623, the field effect transistors 62 to 65 are turned off, and in step 624, the switching relay coils 90 and 92 are turned off to release self-holding and the opening operation of the hood 120 is stopped.

Step 626 is a process for judging whether or not the motors 2, 3 are locked by the pulse interval of the rotation synchronization sensors 27, 28, and the crank arm 122 is forcibly restrained by coming into contact with the mechanical stopper 132. In this case, the pulse interval between the two rotation synchronization sensors 27 and 28 becomes extremely long. Further, a human body or the like is caught in the hood 120 during the opening operation or the closing operation of the hood 120, or the hood opening / closing device is locked due to other troubles.
Similarly, when the motors 2 and 3 are stopped due to the locking of the hood 120 or the hood 120 being fully closed, the pulse interval between the two rotation synchronization sensors 27 and 28 becomes extremely long. In this case, the determination result of step 626 becomes positive, and step 627 determines that the field effect transistors 62 to 65 have been turned on.
It is turned on for 2 seconds, and the motors 2 and 3 are energized for 3 seconds in a locked state. In step 628, the field effect transistors 62 to 65 are turned off, the motor current is cut off, and the motors 2 and 3 are stopped. In step 629, the buzzer 40 is turned on for 1 second, and after a motor lock abnormality or operation stoppage is notified, in step 630, the buzzer 40 is kept off. That is, the operation when the motor is locked is as shown in the timing chart of FIG. 5, and the synchronous pulses of the motor 2 and the motor 3 are regularly generated during the constant speed operation of the motor. Is on, the applied voltage of the motor 3 is on and off, and the buzzer is intermittently blasted every 0.5 seconds. When the load on the motor increases, the interval between the synchronization pulses of the motor 2 and the motor 3 becomes longer, and after the detection point of the motor lock, the electric field effect transistor is turned on and the motor is energized for 3 seconds in the locked state. The motor is turned off by turning off the transistor, the buzzer is turned on for 1 second, and then turned off.

If the determination result in step 626 is negative, the process returns to step 611.

The above description of the operation has been made on the case where the hood 120 is opened from the fully closed state, but when the hood 120 is closed from the fully opened state, the same operation is performed by pressing the hood closing command switch 5.

[Other Embodiments] In the above embodiment, the rotation synchronization sensors 27 and 28 are provided on both the motor 2 and the motor 3, respectively, so that the motor having the slower speed than the motor having the slower speed of the motor 2 and the motor 3 has the higher speed. The speeds of are made to be the same,
If the winding speed is adjusted so that the rotational speeds of both motors differ by 20 to 30%, the field effect transistor of the motor with the lower rotational speed and the output circuit associated therewith can be omitted.

[Effects] As described above, the vehicle hood opening / closing device of the present invention is driven by a motor, and thus requires no manual operation force, and is smaller than a hydraulic device, and the motor has a left / right motor. Since the drive mechanism is simplified and easy to install, the top can be prevented from being twisted due to a mounting error because the drive mechanism can be short. Further, since the rotation control of the motor is electronically performed, it is possible to provide a compact vehicle hood opening / closing device that does not take up a mounting place while the driving mechanism is simple. Moreover, since the motors operate in synchronization, the hood does not become slanted, and when the switchgear is not in use, the power is off, so there is no malfunction due to noise, etc. There is.

Further, the vehicle hood opening / closing device of the present invention is such that when a position limiting switch such as a limit switch that operates at an open operation end of a hood opening / closing member such as a crank arm connected to the drive shaft fails, the drive shaft is An excellent effect that it is extremely safe, because it mechanically forcibly restrains rotation beyond a predetermined position with a mechanical stopper and automatically stops energization of the motor by detecting the lock of the motor. There is.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of a vehicle hood opening / closing device of the present invention, FIGS. 2 (a) and 2 (b) are perspective front views showing a closed state and an open state of the hood, and FIG. 3 (a). ) And (b) are partially cutaway front and side views showing the structure of the motor, FIG. 4 is a flowchart showing a program of the microcomputer, and FIG. 5 is a timing chart showing the operation when the motor is locked. 1 ... Control microcomputer, 2, 3 ... Motor, 4 ... Top open command switch, 5 ... Top close command switch, 27, 28 ... Rotation synchronization sensor, 62, 63, 6
4,65 ... Field-effect transistors, 74, 75, 7
6,77 ... Transistor for driving switching relay, 90,9
1, 92, 93 ... Switching relay coil, 96, 97 ...
Drive shaft, 98, 99 ... Position detection switch, 108, 1
09, 110, 111 ... Switching relay contacts, 122 ...
Crank arm, 132 ... Mechanical stopper.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akira Kakuda 390 Umeda, Kosai City, Shizuoka Prefecture, Asmo Stock Company (72) Inventor Nobuyuki Yamamoto 390, Umeda, Kosai City, Shizuoka Prefecture (72) Inventor, Omoto Seiichi 3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Mazda Co., Ltd. (72) Inventor Tatsuo Maeda 3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture (72) Inventor Kozo Odoi Aki-gun, Hiroshima Prefecture Fuchu-cho Shinchi No. 3 Mazda Co., Ltd. (56) Reference JP-A-61-249822 (JP, A)

Claims (1)

[Claims] 1. A vehicle hood opening / closing device for opening and closing a hood based on rotation of drive shafts provided on both left and right sides of a vehicle, wherein a motor for rotating each of the drive shafts via a reduction mechanism is provided; A switching relay for switching the rotation direction of the motor, a switching relay drive transistor for switching and driving the switching relay, a hood opening command switch and a hood closing command switch for respectively instructing opening or closing of the hood, and hood opening Opening / closing command determining means for determining which of the command switch and the hood closing command switch is operated, and an operating means for opening / closing the hood when either the hood opening command switch or the hood closing command switch is operated. A rotation synchronization sensor that is provided in the motor and that emits a pulse in synchronization with the rotation of the motor; and rotation by the motor via a reduction mechanism. There is a mechanical stopper that limits the rotation of the drive shaft, a motor lock detection unit that detects the lock of the motor by detecting the width of the pulse generated by the rotation synchronization sensor, and a signal from the motor lock detection unit. And an operation stopping means for stopping the operation of the operating means when the above is performed.