JPH0325031A - Motor-operated constant speed running device - Google Patents

Abstract

PURPOSE:To securely judge a clutch failure by employing detecting means for detecting the clutch failure according to whether the throttle valve opening after a specified period of time from the interruption of constant speed running control is wider or not than a specified value, and employing fully closing drive means for fully closing the throttle valve after a specified period of time has elapsed. CONSTITUTION:In the case of a cancelled condition at time t1, although a clutch 102 is immediately disengaged, a motor 101 is not driven before a specified period of time T for failure judgment elapses. Detection means 130 detects a clutch failure according to whether the throttle valve opening after a specified period of time has elapsed from the reception of the cancelling signal is smaller than a specified value A1 or not. Then the throttle valve 110 is fully closed with fully closing means 140. Therefore, the throttle valve opening is brought with a spring force immediately to the specified value A1 when the clutch is normal. When the clutch fails in a condition incapable of being disengaged, the throttle valve opening does not change even when the specified period of time T has elapsed.

Description

[Detailed Description of the Invention] [Summary of the Invention] A motor-type constant speed traveling device equipped with an actuator having a motor that controls the opening degree of a throttle valve and a clutch that transmits the driving force of the motor to a throttle and throttle valve. , a detecting means for detecting a clutch failure based on the opening degree of the throttle valve when a predetermined time has elapsed since the interruption of the constant speed running control, and a fully closing drive means for driving the throttle valve to fully close when the predetermined time has elapsed; To reliably detect clutch failure.

[Industrial application field]

The present invention relates to a motorized constant speed traveling device, and more particularly to a motorized constant speed traveling device having a function of detecting failure of a clutch that prevents an actuator.

[Conventional technology]

Conventionally, motorized constant-speed traveling devices equipped with an actuator that has a motor that controls the opening of the throttle valve according to a control signal and a clutch that transmits the driving force of the motor to the throttle valve have been put into practical use. The clutch is released and the throttle valve is fully opened by spring force, thereby interrupting constant speed driving control. This system has the problem that if the clutch fails and cannot be released, the throttle valve will not return to its original position even if constant speed driving is canceled, so as a failsafe, the clutch is immediately released and the system is released when canceling. Additionally, a system is known in which the motor is operated in the closing direction for a predetermined period of time so that even if the clutch cannot be released, the system can be released by the motor.

Although this system allows for a fail-safe, the driver is not notified of the state in which the clutch cannot be released, so if the motor power supply subsequently fails and the motor cannot be released, cancellation will not be possible.

As a means to solve this problem
As shown in Publication No. 46 (Japanese Unexamined Patent Publication No. 52-109093), when constant speed driving control is canceled, the clutch is immediately released, the throttle valve is fully idled by the motor, and a reference time has elapsed from the time of cancellation. There is a system that detects that the clutch is malfunctioning and cannot be released based on the throttle valve opening. That is, as shown in Fig. 5, if the cancel state is entered at time 1, if the clutch is normal, the clutch will be released at time t1, and the spring force will immediately release the clutch as shown by the solid line in Fig. 5 (3). The throttle valve becomes completely idle, but if the clutch is broken, the throttle valve becomes fully idle slowly by the motor as shown by the broken line in Figure 5 (3), so this time difference can be used to If the throttle valve opening after the reference time T has elapsed is less than or equal to a predetermined opening A1, it is determined to be normal, and if it is equal to or greater than the predetermined opening, it is determined to be malfunctioning.

(Problem to be Solved by the Invention) In the related prior art, the return time from clutch release until the throttle opening reaches a predetermined degree A by spring force is Tc,
After the clutch is released, the motor changes the throttle distance to the predetermined opening A. Assuming that the return time until reaching T0 is T0, the reference time T for failure determination is T c <'r<'r i , as shown in FIG. 5(3). ．． ．． ．． ．．
．． (1), but Tc,
T. If the variation in is large, equation (1) cannot always hold, and Tc<T<T, T<Tc<
Ts, etc., resulting in an erroneous determination.

The present invention is intended to solve this problem, and aims to reliably detect a faulty position of the clutch.

[Means to solve the problem]

FIG. 1 shows a principle diagram of the present invention, which includes a motor 101 that controls the opening degree of the throttle valve 110 according to a control signal, a clutch 102 that transmits the driving force of the motor 101 to the throttle valve 110, an actuator 100 having a clutch l0 during constant speed driving control;
2 and outputs the control signal to the motor 101 according to the difference between the set vehicle speed and the actual vehicle speed, and releases the clutch 102 to interrupt constant speed driving control when a cancel signal is received. In the motor control type constant speed traveling device, the throttle valve 110 when a predetermined period of time has elapsed since the interruption of the constant speed traveling control.
The clutch 102
A detection means 130 for detecting a failure of the throttle valve 110, and a fully open drive means for fully closing the throttle valve 110 after the predetermined time has elapsed! 40.

Note that the detection means 130 includes, for example, a timer +31 that measures the elapsed time after receiving the cancel signal, and a timer 13.
1, a failure of the clutch 102 is determined based on the opening degree of the throttle valve 110 when it is detected that a predetermined time has elapsed.

[Effect]

As shown in Fig. 4, if the cancel state occurs at time t1, the clutch is immediately released (Fig. 4 (1)
)) As shown in FIG. 4(2), the motor is not driven until the predetermined time T for failure determination has elapsed. Then, the detection means detects a clutch failure depending on whether the throttle valve opening is less than a predetermined value A1 when a predetermined time ゛ has elapsed from the reception time t of the cancellation signal, and then the fully closed drive means detects a clutch failure. The valve is fully closed. Therefore, when the clutch is normal, the throttle valve opening is immediately set to the predetermined value A1 by the spring force, as shown by the solid line in Fig. 4 (3).
However, if the clutch fails in a state where it cannot be released, as shown by the broken line in Fig. 4 (3), there is no change in the throttle valve opening even after the predetermined time T has elapsed, so it will fall below the predetermined value A. There isn't. Therefore, the Tc and T. Even if there are variations, (1) (2) is always maintained, and clutch failure can be reliably detected.

[Embodiments of the invention]

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

FIG. 2 shows an embodiment of the present invention, in which 1 is a controller. This controller l is a microcomputer]1 (hereinafter abbreviated as microcomputer), a driver 12,
13, 14 and an A/D converter 15. 2 is an actuator that controls the opening degree of the throttle valve 4;
Motor 2l, motor 2l controlled by microcomputer 11
A reduction gear 22 that decelerates the rotation of the reduction gear 22, a clutch 23 that transmits the driving force from the reduction gear 22 to the throttle valve, an electromagnetic coil 24 that connects and releases the clutch 23, and detects the operating amount of the actuator, that is, the opening degree of the throttle valve. It consists of a potentiometer 25 for Note that the potentiometer 25 may be one that directly detects the opening degree of the throttle valve 4. Reference numeral 3 denotes a link mechanism which has a known structure that allows the throttle valve to be opened and closed from either the actuator 2 or the accelerator pedal 0.

6 is a return spring that biases the throttle valve in the closing direction; 7
8 is a set switch, 8 is a cancel switch linked to the brake pedal, clutch pedal, etc., and 9 is a vehicle speed sensor.

The operation of the microcomputer 11 will be explained below with reference to the flowchart shown in FIG. The microcomputer 11 starts operating when a power source (not shown) is turned on, and determines in step S1 whether or not the set switch 7 is operated to enter the set state. When the set state is reached, the electromagnetic coil 24 is energized to connect the clutch 23 in step S2, and the vehicle speed detected from the vehicle speed sensor 9 is stored as the set vehicle speed in step S3, and constant speed driving control is started. From then on, this 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, and the opening degree of the actuator 2, that is, the opening degree of the throttle valve 4 is controlled.

Incidentally, the storage process of the set vehicle speed in step S3 is executed only immediately after the speed is set. If it is determined in step Sl that it is not in the set state, the process moves 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 the cancel state is entered, and thereafter, and during constant speed running control, the process moves to step S7. Therefore, when the cancellation state is reached, the energization of the electromagnetic coil 24 is stopped in step S5, the clutch is released and the constant speed running control is interrupted, and then the timer is started in step S6, and from then on, from step S4 to step S7. Processing moves on. Step S
In step S7, it is determined whether or not the timer is in operation, and if it is in operation, it is determined in step S8 whether or not a reference time T for failure determination has elapsed.

This reference time T is set to be larger than the maximum value, taking into account the variation in the time Tc. Step S7,
If the determination in S8 is N (no), the process ends. When the reference time T has elapsed since the timer activation in step S6, the process moves from step S8 to step S9, and a failure determination of the clutch is performed.

That is, the actuator opening degree A is read from the potentiometer 25 via the A/D converter 15, and is compared with the opening degree A, which is set to a value slightly higher than 80, which corresponds to the fully idle state. If the opening degree is less than the predetermined opening degree A1, the clutch is released and is normal, so the process ends. Incidentally, as shown by the broken line in FIG. 3, the motor may be closed in step Sll just in case. Step S9
If the actuator opening degree 8 is less than the predetermined opening degree A+, the clutch is still connected and has failed, so step SIO
At step S1, abnormality processing such as reset prohibition processing, lamp lighting, and storage processing for indicating that the clutch is out of order is performed. Thereafter, in step 311, the motor 21 is driven to the closed side for a predetermined period of time to completely shut down the throttle and exhaust valves.

[Effects of the Invention] As explained in detail below, according to the present invention, the throttle valve is not driven until a predetermined period of time has elapsed after the cancellation state has been entered, and during that time, a failure determination of the clutch is performed, and then the throttle valve is not driven. Since the valve is completely idle, it is possible to reliably determine the failure of the crankshaft without malfunction.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the principle 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, Fig. 5 is a conventional diagram. This is a time chart. In the figure, 100 is an actuator, 110 is a throttle valve, 120 is a control device, 130 is a detection means, and 140 is a full-open drive means.

Claims (1)

[Scope of Claims] 1. An actuator having a motor that controls the opening of a throttle valve in accordance with a control signal and a clutch that transmits the driving force of the motor to the throttle valve, and the clutch during constant speed driving control. and a control device that outputs the control signal to the motor according to the difference between the set vehicle speed and the actual vehicle speed, and releases the clutch and interrupts constant speed driving control when a cancel signal is received. In the motor-type constant speed traveling device, a detection means detects a failure of the clutch depending on whether the opening degree of the throttle 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; 1. A motor-type constant-speed traveling device, characterized in that the motor-type constant speed traveling device is further provided with a fully closing drive means for fully closing the throttle valve after a predetermined period of time has elapsed.