JP3003012B2 - Clutch sticking detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting the stuckness of a clutch provided on a motor type actuator, and more particularly, to the stabilization of a clutch for releasing a constant speed running control provided on a motor type throttle actuator in a constant speed running control device of a vehicle. The present invention relates to a clutch sticking detection device suitable for detecting a clutch.

[0002]

2. Description of the Related Art As disclosed in, for example, Japanese Patent Application Laid-Open No. Sho 62-218238, an engine has been conventionally designed so that the actual vehicle speed converges to the target vehicle speed based on a deviation between the actual vehicle speed and the target vehicle speed. 2. Description of the Related Art There has been known a constant-speed traveling control device in which the opening of a throttle valve (throttle opening) is controlled by a motor so that a vehicle travels at its target vehicle speed.

FIG. 5 is a block diagram of such a conventional constant speed cruise control device. Reference numeral 1 denotes a control unit including an arithmetic processing circuit comprising a microcomputer, and 2 denotes a motor 3 driven by the control unit 1. And a throttle actuator. The actuator 2 has a driven shaft 5 having a drive shaft 5 to which rotation of the motor 3 is transmitted via a reduction gear 4 and a pulley 8 at one end for pulling an actuator cable 7 having one end connected to an accelerator pedal 6. It has a shaft 9 and an electromagnetic clutch 10 interposed between the drive shaft 5 and the driven shaft 9. When the exciting coil 11 of the clutch 10 is excited by the control unit 1, the clutch 10 is connected, the rotation of the motor 3 is transmitted to the pulley 8, and the accelerator pedal 6 is actuated via the actuator cable 7, so that the throttle valve 12 is opened and closed.
The control unit 1 includes a vehicle speed signal, a brake signal, and various command signals (set signal, resume signal,
Based on the cancel signal, the motor 3 of the actuator 2 is driven, and the excitation coil 11 of the clutch 10 is energized to perform the constant speed traveling control.

The drive coil 11 of the clutch 10 is de-energized when a brake signal and a cancel signal are input to the control unit, thereby disconnecting the clutch 10 from the connection between the drive shaft 5 and the driven shaft 9. Therefore, the constant speed traveling control is released. When the cruise control is released, the actuator cable 7 returns to the position where the throttle opening is zero, and the operation of the accelerator pedal 6 becomes possible.

FIG. 6 is a diagram showing a circuit configuration in the conventional constant speed traveling control device shown in FIG. As is clear from FIG. 6, the control unit 1 and the actuator 2 are connected by a wire harness 13, and the wire harness 13 is connected to two motor drive lines 1.
4, 14 and two clutch drive lines 15, 15,
A brake switch monitor line 17 is connected to the control unit 1 from one end of the brake switch 16 disposed on one clutch drive line 15 on the actuator 2 side. Further, on the control unit 1 side, a short circuit detecting circuit 18 for detecting a short circuit between the motor drive lines 14 and 14 is provided.
When a short circuit between the four is detected, the control unit 1 immediately stops energizing the exciting coil 11 of the clutch 10 and cancels the constant speed traveling control. The brake switch 16 is a brake pedal (not shown).
Is depressed to release the clutch drive line 15, thereby cutting off the power supply to the exciting coil 11 of the clutch 10 and releasing the constant speed traveling control.

Further, a brake switch monitor circuit 19 connected to a brake switch monitor line 17 is provided on the control unit 1 side. in this case,
Since the resistor R1 is connected between the emitter and the collector of the clutch driving transistor 20 and the resistor R2 is connected between the brake monitor line 17 and the ground, regardless of whether or not the excitation coil 11 of the clutch 10 is energized. When the brake pedal is not depressed, that is, when the brake switch is closed, the brake switch monitor circuit 19 always receives an H level voltage, and the brake switch is depressed and the brake switch 16 is turned on.
Is released, the voltage input of the brake switch monitor circuit 19 becomes L level, so that the constant speed traveling control can be canceled also by detecting the L level.

[0007]

However, in the conventional constant-speed traveling control device provided with the above-mentioned motor-operated throttle actuator 2, the clutch 10 remains stuck during the constant-speed traveling control. Considering the case, even if the constant-speed running control is canceled, since the driven shaft 9 is still connected to the drive shaft 5, there arises an inconvenience that the throttle valve 12 is kept open. .

Therefore, a sensor for detecting the fixation of the clutch 10 is provided, and when the fixation of the clutch 10 is detected by the above-mentioned sensor when the constant-speed running control is released, the motor 3 is immediately driven to connect the actuator cable 7 to the throttle It is necessary to return to the position where the opening is zero.

However, in order to provide a sensor for detecting the fixation of the clutch 10 in, for example, the actuator 2, a wire harness 13 must be additionally provided for the wire harness 13. Therefore, it is necessary to provide a dedicated detection circuit for receiving the above signal, which not only complicates the configuration but also increases the cost.

Accordingly, the present invention provides a clutch stuck detecting device which can surely detect a stuck clutch without adding a wire harness for detecting a stuck clutch and newly installing a dedicated detection circuit. The purpose is to:

[0011]

According to the present invention, a conventional constant-speed traveling control device shown in FIG. 5 detects short circuit detecting means for detecting a short circuit between a pair of motor drive lines and operation of a brake switch. Utilizing the provision of a brake switch operation detecting means for detecting the stiction of the clutch by any of these detecting means.

That is, according to the present invention, the clutch is provided with a clutch operation detecting switch which is closed when the clutch is connected, and this switch is connected between the pair of motor drive lines so that the clutch is fixed. This short-circuit detecting means is configured to detect this clutch sticking as the same phenomenon as the short-circuit between the pair of motor drive lines.

Further, in the present invention, when the clutch is detected by connecting the clutch operation detecting switch between one of the pair of clutch drive lines and the ground, the clutch is fixed. The brake switch monitoring means is configured to detect the same phenomenon as the actuation of the brake switch by the brake switch monitoring means.

[0014]

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

FIG. 1 is a block diagram of a constant speed traveling control device provided with a clutch stuck detecting device according to the present invention. In FIG. 1, the clutch disk 1 of the clutch
0a and 10b are provided with a contact X at one 10a and at the other 10a.
A clutch operation detection switch 21 having a contact Y at b is provided. The switch 21 is connected to the clutch 10
Is closed with the connection. The configuration shown in FIG. 1 is similar to the clutch operation detection switch 21 described above.
Except for having, the corresponding members are denoted by the same reference numerals as in FIG. 5, and redundant description will be omitted.

FIG. 2 is a circuit diagram of a first embodiment of the present invention.
2 is a portion added to the circuit diagram of FIG. The portion 22 is provided with a relay 25 having an exciting coil 23 and a normally closed contact 24 connected in parallel to the exciting coil 11 of the clutch 10 and a clutch operation detecting switch 21. A series circuit of the contact XY of the clutch operation detection switch 21 and the relay contact 24 is connected between the motor output lines 14.

In the circuit of FIG. 2, when the excitation coil 11 of the clutch 10 is not energized, the relay contact 24 is closed, and when the excitation coil 11 is energized, the relay contact 24 is closed.
Is opened, so that the circuit portion 22 does not exist during normal constant-speed running control. On the other hand, if the clutch 10 is stuck despite the termination of the constant-speed running control and the energization of the exciting coil 11 of the clutch 10 is stopped, both the contact XY of the switch 21 and the relay contact 24 are closed. The motor drive lines 14 and 14 are short-circuited and detected by the short-circuit detection circuit 18 provided in the control unit 1. The control unit 1 turns on the clutch and immediately drives the motor 3 to drive the actuator cable. 7 is returned to the zero throttle position, and the subsequent constant-speed running control is stopped.

As is apparent from the above description, the configuration of FIG. 2 is different from the configuration of FIG. 6 only in that a clutch operation detection switch 21 and a relay 25 are added to the actuator 2.
The object of the present invention is achieved without making any changes to the control unit 1 and the wire harness 13.

FIG. 3 is a circuit diagram of a second embodiment of the present invention. In this embodiment, a portion 26 of the actuator 2 surrounded by a broken line is a portion added to the circuit of FIG. . The portion 26 is provided with a clutch operation detection switch 21 and a resistor R3 similar to those of the first embodiment described above, and these series circuits are connected to the clutch drive lines 15, 1 and 2.
5 is connected between the brake switch 16 side line and the ground.

In the circuit shown in FIG. 3, when the excitation coil 11 of the clutch 10 is not energized and the clutch 10 is not fixed, the switch 21 is open, and the potential of the brake switch monitor line 17 becomes H level. However, if the clutch 10 is stuck, the switch 21
Is closed, the brake switch monitor line 17 is grounded through the resistor R3.
Becomes L level, as in the case where is opened, and this is detected by the brake switch monitor circuit 19 of the control unit 1, and the constant speed traveling control is stopped.

FIG. 4 is a circuit diagram of a third embodiment of the present invention. In this embodiment, a portion 27 of the actuator 2 surrounded by a broken line is a portion added to the circuit of FIG. The above-mentioned portion 27 is provided with only the clutch operation detection switch 21 similar to the first and second embodiments described above, and this is the same as the clutch drive lines 15, 15 on the side opposite to the brake switch 16 side. Connected to ground.

Similarly to the circuit of FIG. 3, when the clutch excitation coil 11 is not energized and the clutch 10 is not fixed, the circuit of FIG. Is at the H level, but if the clutch 10 is fixed,
The brake switch monitor line 17 is grounded through the clutch exciting coil 11, and the potential of the brake switch monitor line 17 becomes L level. Therefore, the fixation of the clutch 10 is detected by the brake switch monitor circuit 19, and the constant speed traveling control is stopped.

[0023]

According to the present invention, there is no need to add a wire harness for detecting the clutch stuck to the conventional structure and to provide a dedicated detecting means, so that the clutch can be formed with a simple and inexpensive structure. There is an advantage that the fixation can be reliably detected.

Although the above-described embodiment is an example in which the present invention is applied to a motor-type throttle actuator in a constant-speed traveling control device, the present invention is not limited to this, and a motor-type actuator having a clutch is provided. It is apparent that the present invention can be applied to various control devices provided with.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a constant speed traveling control device including a clutch stuck detecting device according to the present invention.

FIG. 2 is a circuit configuration diagram of a first embodiment of the present invention.

FIG. 3 is a circuit configuration diagram of a second embodiment of the present invention.

FIG. 4 is a circuit configuration diagram of a third embodiment of the present invention.

FIG. 5 is a configuration diagram of a conventional constant speed traveling control device.

FIG. 6 is a circuit configuration diagram of a conventional constant speed traveling control device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Control unit 2 Actuator 3 Motor 7 Actuator cable 10 Electromagnetic clutch 11 Clutch excitation coil 12 Throttle valve 13 Wire harness 14, 14 Motor drive line 15, 15 Clutch drive line 16 Brake switch 17 Brake switch monitor line 18 Short circuit detection circuit 19 Brake Switch monitor circuit 21 Clutch operation detection switch 25 Relay

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Akira Nurioka 3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Naldec Co., Ltd. (56) References JP-A-3-208735 (JP, A) JP-A-Hei JP-A-3-67728 (JP, A) JP-A-2-29038 (JP, A) JP-A-2-92739 (JP, A) JP-A-62-218238 (JP, A) JP-A-61-291224 (JP, A) A) Hikaru Hira 1-116738 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B60K 31/02 F02D 9/02 F02D 29/02

Claims (3)

(57) [Claims] 1. A motor type actuator comprising a motor, a clutch for interrupting a power transmission path between a driven body driven by the motor and the motor, and a pair of actuators connected between the actuator and the motor. A control unit that controls the actuator through a motor drive line and a pair of clutch drive lines; a short-circuit detection unit provided in the control unit to detect a short circuit between the pair of motor drive lines; A clutch operation detection switch that is closed when the clutch is connected, and wherein the clutch operation detection switch is connected between the pair of motor drive lines. . 2. A motor-operated actuator comprising a motor for adjusting a throttle opening, a clutch for interrupting a power transmission path between a throttle valve driven by the motor and the motor, and A control unit that controls the actuator through a pair of connected motor drive lines and a pair of clutch drive lines to perform constant-speed traveling control of the vehicle; and the control unit to detect a short circuit between the pair of motor drive lines. And a clutch operation detecting switch provided on the clutch and closed with connection of the clutch, wherein the clutch operation detecting switch is provided between the pair of motor drive lines. A clutch sticking detection device, which is connected. 3. A motor-operated throttle actuator comprising a motor for adjusting a throttle opening, a clutch for interrupting a power transmission path between a throttle valve driven by the motor and the motor, and a motor-operated throttle actuator. A control unit that controls the actuator through a pair of motor drive lines and a pair of clutch drive lines connected to the control unit to control the vehicle at a constant speed; and a brake pedal interposed in one of the pair of clutch drive lines. A brake switch for releasing the clutch drive line in accordance with the operation of, a brake switch operation detecting means provided in the control unit for detecting the operation of the brake switch, and a connection of the clutch provided in the clutch Detection of clutch operation that is closed with And a switch, wherein the clutch operation detection switch is connected between one of the pair of clutch drive lines and ground.