JPH0771902B2 - Motor type constant speed traveling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline of the Invention] In a motor type constant speed traveling device including an actuator having a motor for controlling the opening of a throttle valve and a clutch for transmitting the driving force of the motor to the throttle valve, Detecting means for detecting a clutch failure based on the throttle valve opening when a predetermined time has elapsed after interruption of the high-speed traveling control, and fully-closed driving means for fully closing the throttle valve when the predetermined time has elapsed are provided. Reliably detect failures.

[Industrial application field]

The present invention relates to a motor type constant speed traveling device, and more particularly to a motor type constant speed traveling device having a function of detecting a failure of a clutch which constitutes an actuator.

[Prior Art] Conventionally, a motor type constant speed traveling device including a motor having a motor for controlling the opening of a throttle valve according to a control signal and a clutch for transmitting a driving force of the motor to the throttle valve has been put into practical use. When canceling, the clutch is released and the throttle valve is fully closed by the spring force to interrupt the constant speed traveling control. This system has the problem that if the clutch fails in a non-releasable state, the throttle valve will not return to its original position even if the constant-speed running is cancelled. There is known a method in which the system can be released by the motor even if the clutch cannot be released by operating the motor in the closed side for a predetermined time while releasing the clutch. In this method, fail-safe is possible, but since the driver is not notified of the clutch disengageable state, if the motor power fails after that and the motor cannot disengage it, cancellation is impossible.

As a means for solving this problem, as disclosed in Japanese Patent Publication No. 60-58046 (Japanese Patent Laid-Open No. 52-1009093), the clutch is immediately released when the constant speed traveling control is canceled, and the throttle valve is completely opened by the motor. There is a method in which the clutch is closed and a failure is detected in the state where the clutch cannot be released depending on the throttle valve opening when a reference time has elapsed from the time of cancellation. That is, as shown in FIG. 5, when became canceled state at time t _1, the clutch is a clutch is released at time t ₁ the normal case, the spring force as indicated by the solid line in FIG. 5 (3) Immediately the throttle valve is fully closed, but if the clutch is out of order, the throttle valve is slowly closed fully by the motor as shown by the broken line in Fig. 5 (3). throttle valve opening when the reference time T has elapsed from the normal if the predetermined opening a ₁ or less, is to determine a failure if a predetermined opening over.

[Problems to be Solved by the Invention]

In the related art, the return time from the clutch release until the throttle opening reaches the predetermined opening A ₁ by the spring force is Tc, and the throttle opening from the clutch release by the motor is the predetermined opening A _1
Assuming that the return time until reaching T is T _M , the reference time T for failure determination must be set so that Tc <T <T _M (1) as shown in FIG. 5 (3). However, if the variations in Tc and T _M are large, equation (1) cannot always be satisfied and Tc
Since < _TM <T, T <Tc < _TM, etc., erroneous determination occurs.

The present invention solves the above problems, and an object of the present invention is to reliably detect a clutch failure.

[Means for Solving the Problems]

FIG. 1 shows the principle of the present invention. A motor 1 for controlling the opening of the throttle valve 110 according to a control signal.
01 and the driving force of the motor 101 to the throttle valve 110
100 with a clutch 102 transmitting to
During constant speed running control, the clutch 102 is connected and the control signal corresponding to the difference between the set vehicle speed and the actual vehicle speed is output to the motor 101, and the clutch 102 is released when a cancel signal is received. In a motor type constant speed traveling device having a control device 120 for interrupting constant speed traveling control, whether or not the opening of the throttle valve 110 when a predetermined time has elapsed from the interruption of the constant speed traveling control is below a predetermined value. Accordingly, a detection unit 130 for detecting a failure of the clutch 102 and a fully-closed driving unit 140 for fully-closing the throttle valve 110 after the predetermined time has elapsed are provided.

The detecting means 130 includes, for example, a timer 131 that measures the elapsed time after receiving the cancel signal, and a throttle valve when the timer 131 detects that a predetermined time has elapsed.
It comprises means 132 for judging the failure of the clutch 102 from the opening degree of 110.

[Action]

As shown in FIG. 4, the clutch is immediately released when the cancel state is reached at time t ₁ (FIG. 4 (1)), but the motor has a predetermined failure determination condition as shown in FIG. 4 (2). It is not driven until the time T has elapsed. Then, the detecting means detects a clutch failure according to whether or not the throttle valve opening degree is equal to or smaller than a predetermined value A ₁ when a predetermined time T has elapsed from the time t ₁ at the time of receiving the cancel signal, and thereafter, the fully closed drive means causes the throttle valve to be closed The valve is fully closed. Therefore, when the clutch is normal, the throttle valve opening immediately reaches the predetermined value A ₁ due to the spring force as shown by the solid line in FIG. 4 (3), but when the clutch fails in the unreleasable state, it becomes the fourth value. As indicated by the broken line in FIG. 3C, the throttle valve opening does not change even after the elapse of the predetermined time T, and therefore does not fall below the predetermined value A ₁ . Therefore, even if there are variations in Tc and T _M , the above equation (1) is always established, and a clutch failure can be reliably detected.

Example of Invention

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

FIG. 2 shows an embodiment of the present invention, and 1 is a controller. This controller 1 is a microcomputer
11 (hereinafter abbreviated as a microcomputer), drivers 12, 13, 14 and an A / D converter 15. 2 is a throttle valve 4
An actuator that controls the opening degree of the motor 21, the motor 21 controlled by the microcomputer 11, the reduction gear 22 that reduces the rotation of the motor 21, the clutch 23 that transmits the driving force from the reduction gear 22 to the throttle valve, the clutch 23 are connected, It includes an electromagnetic coil 24 for releasing and an operation amount of an actuator, that is, a potentiometer 25 for detecting an opening of a throttle valve. The potentiometer 25 is the throttle valve 4
The opening degree may be directly detected. Reference numeral 3 denotes a link mechanism having a known structure in which the throttle valve can be opened and closed by either the actuator 2 or the accelerator pedal 10. 6 is a return spring for urging the throttle valve in the closing direction, 7 is a set switch, 8 is a cancel switch linked with a brake pedal, a clutch pedal, etc.,
Reference numeral 9 is a vehicle speed sensor.

The operation of the microcomputer 11 will be described below with reference to the flowchart of FIG. The microcomputer 11 starts its operation when a power source (not shown) is turned on, and determines in step S1 whether or not the set switch 7 has been operated to enter the set state.
If the set state is reached, the electromagnetic coil 24 is energized to connect the clutch 23 in step S2, and the vehicle speed sensor 9 is connected in step S3.
The vehicle speed detected from is stored as the set vehicle speed, and the constant speed traveling control is started. After that, in step S3, a control signal is output to the motor 21 according to the difference between the actual vehicle speed and the set vehicle speed to control the opening of the actuator 2, that is, the opening of the throttle valve 4. The storage process of the set vehicle speed in step S3 is executed only immediately after the setting. If it is determined that the set state is not set in step S1, the process proceeds to step S4. In step S4, it is determined whether or not the cancel switch 8 is turned on to enter the cancel state, and step S5 is executed only immediately after entering the cancel state. After that, and during constant speed traveling control, the process proceeds to step S7. Therefore, in the cancel state, the power supply to the electromagnetic coil 24 is stopped in step S5,
The clutch is released to interrupt the constant speed traveling control, then the timer is started in step S6, and then the process proceeds from step S4 to step S7. In step S7, it is determined whether the timer is operating. If it is operating, it is determined in step S8 whether the failure determination reference time T has elapsed T. The reference time T is set to a time larger than the maximum value in consideration of the variation of the time Tc. If the determinations at steps S7 and S8 are N (no), the process ends. Step S6
When the reference time T has elapsed from the timer operation in step S8, the process proceeds from step S8 to step S9, and the clutch failure determination is performed. That is, the actuator opening A is adjusted by the potentiometer 25.
Read through the A / D converter 15 and compared with the opening A ₁ set to a value slightly higher than the value A ₀ corresponding to full closing. If the actuator opening A is less than the predetermined opening A _{1, the} clutch is released. Since it has been performed and is normal, the processing is ended as it is.
Incidentally, as indicated by the broken line in FIG. 3, the motor may be closed at step S11 just in case. If the actuator opening A is greater than or equal to the predetermined opening A _{1 in} step S9, the clutch is still in the connected state, and therefore the reset prohibition process in step S1, the lamp lighting, and the clutch are in failure. Abnormal processing such as memory processing is performed. After that, in step S11, the motor 21 is closed for a predetermined time to fully close the throttle valve.

〔The invention's effect〕

As described above in detail, according to the present invention, the throttle valve is not driven until a predetermined time elapses from the cancel state, the clutch failure determination is performed during that period, and then the throttle valve is fully closed. Therefore, the clutch failure determination can be reliably performed without malfunction.

[Brief description of drawings]

FIG. 1 is a principle diagram of the present invention, FIG. 2 is a diagram showing an embodiment of the present invention, FIG. 3 is a flow chart showing the operation of the present invention, FIG. 4 is a time chart of the present invention, and FIG. Is a time chart of. In the figure, 100 is an actuator, 110 is a slot valve, and 12
Reference numeral 0 is a control device, 130 is a detection means, and 140 is a fully closed drive means.

Claims (1)

[Claims] 1. An actuator having a motor for controlling the opening of a throttle valve according to a control signal and a clutch for transmitting the driving force of the motor to the throttle valve, and the clutch is connected during constant speed traveling control. A motor-type constant motor equipped with a control device that outputs the control signal according to the difference between the set vehicle speed and the actual vehicle speed to the motor, and releases the clutch to interrupt the constant speed traveling control when a cancel signal is received. In the high-speed traveling device, a detection unit that detects a failure of the clutch depending on whether the opening degree of the slot valve is equal to or less than a predetermined value when a predetermined time has elapsed from the interruption of the constant speed traveling control, and the predetermined time has elapsed. After that, a fully-closed driving means for fully closing the throttle valve is provided.