JPH01229728A - Control circuit for vehicle fixed speed running device - Google Patents

Abstract

PURPOSE:To prevent a car running speed from increasing and a canceling process by disconnecting a clutch means and maintaining a working member, which performs a car speed control, in a free condition when the car running speed exceeds a predetermined car speed set higher by a predetermined value than a preset car speed. CONSTITUTION:A working member 4 is connected to a motor 2 of an actuator 1 through a magnet clutch 3, while a throttle valve 6 is connected to the working member 4 through a throttle wire 5. Accordingly, when the magnet clutch 3 is connected, the throttle valve 6 is opened and closed following rotating the motor 2. An excitation coil 10 of the magnet clutch 3 is controlled by a control circuit 7 being based on a detection signal from a car speed sensor 11. Now when a car running speed exceeds a preset car speed set higher by a predetermined value than a preset car speed, the magnet clutch 3 is disconnected.

Description

[Detailed Description of the Invention] [Object of the Invention] <Industrial Application Field> The present invention relates to a control circuit for a constant speed traveling device for a vehicle that uses an actuator that is driven by a motor and includes an actuating member that performs a vehicle speed control operation. .

<Prior Art> Some constant speed traveling systems for vehicles use an actuator that includes an actuating member that is connected to a throttle valve and driven by a motor to control the vehicle speed.

In such a motor-type actuator, by interposing a clutch between the motor and the actuating member, the clutch is connected only when driving at a constant speed, and the rotational force of the motor is transferred to the actuating member. There is a system that transmits signals to the accelerator pedal and motor so that they do not interfere with each other except when driving at a constant speed.9 Furthermore, in order to easily determine the initial state of the actuating member, its intended position is detected. By providing a deceleration side limit switch to allow the deceleration side drive current to flow through the deceleration side limit switch to the motor, the limit switch becomes open when the actuating member returns to the desired position. Since the deceleration side drive current can be cut off, unnecessary rotation of the motor in the deceleration side can be prevented.

By the way, in this control circuit, when driving on a downhill slope where running resistance is small, for example, the normal vehicle speed increases, so the motor is set to the deceleration side in order to drive the throttle valve to the deceleration side instead of I7. A driving current will be applied. At this time, if the deceleration side limit switch described above is open and malfunctions, even if the control circuit outputs a signal that causes the deceleration side drive current to flow, the current will not flow to the motor, so the vehicle speed will not increase. A problem arises that cannot be prevented.

As shown in Special Publication No. 60-163735, by performing a cancellation process when the vehicle speed during constant speed driving exceeds the set vehicle speed by a predetermined value,
The above problem can be solved. However, when accelerating to overtake by operating the accelerator pedal while driving at a constant speed on a highway, etc., the cancellation process will be canceled every time the vehicle speed exceeds a predetermined value or more than the set vehicle speed, and after the overtaking is completed the constant speed will be canceled. This has the disadvantage of complicating operations, such as the need to reset the settings in order to continue driving.

<Problems to be Solved by the Invention> In view of the problems of the prior art, the main object of the present invention is to reduce the speed of the vehicle when the vehicle speed exceeds the set vehicle speed by a predetermined value while driving at a constant speed. An object of the present invention is to provide a control circuit for a constant speed traveling device for a vehicle, which is improved so as to prevent an increase in speed and to avoid unnecessary cancellation processing.

[Structure of the Invention] Means for Solving the Problems According to the present invention, such an object is to calculate the traveling vehicle speed based on a vehicle speed detection signal and to perform calculation control to maintain the traveling vehicle speed at a set vehicle speed. an actuator comprising: a control means for supplying acceleration and deceleration control signals; a motor that rotates in forward and reverse directions based on the control signal; an actuator that includes an actuation member that performs a vehicle speed control operation and a clutch means that connects the motor to the actuation member. In a control circuit of a constant speed traveling device for a vehicle, when the control means detects that the traveling vehicle speed exceeds a predetermined vehicle speed that is set higher than the set vehicle speed by a predetermined value, a clutch disengagement signal is transmitted to the clutch. This is achieved by providing a control circuit for a vehicle constant speed traveling device characterized by outputting an output to a means. Furthermore, when the control means detects that the traveling vehicle speed exceeds a predetermined vehicle speed set higher than the set vehicle speed by a predetermined value, the control means applies a deceleration control signal larger than a normal deceleration control signal to the motor for a predetermined period of time. It is good to output it.

In this way, by disengaging the clutch means when the traveling vehicle speed exceeds the set vehicle speed by a predetermined value or more, the vehicle speed control operation can be interrupted.

Furthermore, by rotating the motor toward the deceleration side, even if the clutch is mechanically stuck, for example, the operating member that performs the vehicle speed control operation can be reliably returned to the deceleration side.

<Embodiments> Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In Figure 1, four transistors Q1 to Q
A well-known H-run register bridge circuit consisting of 4 constitutes a forward/reverse drive circuit for a motor 2 serving as a drive source for an actuator 1 of a constant speed traveling system for a vehicle. An actuating member 4 is connected to the drive shaft of the motor 2 via a magnetic clutch 3, and a throttle valve 6 is connected to the actuating member 4 via a throttle wire 5. Therefore, when the magnetic clutch 3 is in the connected state, the throttle valve 6 is interlocked with the rotation of the motor 2.

In the bridge circuit described above, 1 to Lancistor Q1
and each emitter of Q2 is connected to the power supply terminal V,
The respective transmitters of the transistors Q3 and Q4 whose collectors are connected to the respective collectors thereof are grounded via the control circuit 7. Further, both terminals of the motor 2 are connected to the connection point between the collectors of the transistors Q1 and Q3 and the connection point between the collectors of the transistors Q2 and Q4 via normally closed limit switches 8 and 9, respectively. . Therefore, by supplying an ON signal from the control circuit 7 to the transistors Q1 and Q4, the motor 2 is rotated in a direction that drives the actuating member 4 to the acceleration side, which is the fully open side of the throttle valve 6, or the transistors Q2 and Q3 are turned on. By turning on, the motor 2 is rotated in a direction that drives the actuating member 4 to the deceleration side.

The limit switch 8 is opened when the actuating member 4 reaches its acceleration-side operating limit, and the limit switch 9 is opened when the actuating member 4 reaches its deceleration-side operating limit.
Each limit switch 8 and 9 is set. Furthermore,
The limit switch 8 is connected in parallel with a diode D1 that is directed to flow a deceleration drive current to the motor 2, and the limit switch 9 is connected in parallel with a diode D2 that is directed to flow an acceleration drive current to the motor 2. By doing so, over-rotation of the motor 2 can be suitably prevented.

In addition, the excitation coil 10 of the magnetic clutch 3 described above
is driven by a transistor Q5 whose on/off control is controlled by a control circuit 7. Further, the control circuit 7 receives, for example, a pulse signal as input from the vehicle speed sensor 11, and calculates the traveling vehicle speed at every predetermined cycle time.

Next, the operation procedure according to this embodiment will be described below with reference to FIG.

When set to constant speed driving state, magnetic clutch 3
is in a connected state. As the traveling vehicle speed changes up or down with respect to the set value for constant speed driving, the deviation of the vehicle speed from the set value and the speed difference between the current vehicle speed and the previous vehicle speed are calculated for each control cycle (for example, 250 m5). Acceleration or deceleration is calculated from the control circuit 7, and an ON signal whose time changes according to a control value calculated based on these values is supplied from the control circuit 7 to the transistors Q1 and Q4 or the transistors Q2 and Q3, and the motor 2 rotates toward acceleration or deceleration to maintain the vehicle speed at the set value.

Next, when the vehicle speed increases due to a downhill slope where running resistance decreases, for example, a deceleration signal is supplied to the motor 2.
In the case of a long and relatively steep downhill slope, the vehicle speed continues to increase even though the deceleration signal is continuously supplied.

Then, when the upper limit value, which may be 10 km/h higher than the set value, is exceeded, the control circuit 7 supplies an off signal to the transistor Q5 to disable the magnetic clutch 3. Since the member 4 is in a free state, the throttle valve 6 is forcibly moved to a fully closed state by a closing spring (not shown), thereby providing stronger engine braking and preventing an increase in vehicle speed.

At the same time, the control circuit 7 is configured to continuously rotate the motor 2 in the deceleration side for a predetermined period of time, which may be, for example, 1 to 2 seconds.
supplies an on signal to transistors Q2 and Q3.

This is to ensure that the throttle valve 6 is driven to the fully open state even if, for example, the magnetic clutch 3 is mechanically stuck.

Note that in the above-described control, the constant speed running state is not canceled, so if the vehicle speed decreases and falls below the upper limit value, the constant speed running state can be restored again.

In addition, when the vehicle speed exceeds the upper limit, magnetic clutch 3
Although the motor 2 is rotated toward the deceleration side at the same time as the motor 2 is turned off, the magnetic clutch 3 may be turned off after the motor 2 is rotated toward the deceleration side for a predetermined period of time.

Further, as shown in FIG. 3, for example, if the deceleration side limit switch 9 has failed to open before the vehicle speed exceeds the upper limit, the motor 2 will not rotate to the deceleration side, but the magnetic clutch 3 Since the actuating member 4 is in the disconnected state,
Since the throttle valve 6 is in a free state, the throttle valve 6 can be fully opened. Therefore, even if the deceleration side limit switch 9 fails to open, it is possible to prevent the vehicle speed from increasing too much.

Furthermore, even if the vehicle speed increases beyond the above-mentioned upper limit when overtaking by manipulating the accelerator while driving at a constant speed on a highway, etc., the same process as described above is performed, so the constant speed It is possible to return to the constant speed running state after overtaking without canceling the running state.

[Effects of the Invention] As described above, according to the present invention, when the traveling vehicle speed exceeds a predetermined vehicle speed that is set higher than the set value, the actuating member disengages the clutch means and performs a vehicle speed control operation. By making the vehicle free, it is possible to prevent the vehicle speed from increasing. Furthermore, by rotating the motor to the deceleration side,
If the clutch means is stuck, the actuating member is returned to its operating limit on the deceleration side via the clutch means, so that deceleration can be reliably achieved. Moreover, even if the vehicle speed increases due to operation of the accelerator pedal, such as when overtaking, the cancellation process is not performed each time, which is extremely effective.

[Brief explanation of the drawing]

FIG. 1 is a schematic circuit diagram showing a main part of a control circuit of a constant speed traveling device for a vehicle to which the present invention is applied. FIGS. 2 and 3 are time charts showing the operating procedure of the vehicle constant speed traveling system according to the present invention. 1... Actuator 2... Motor 3... Magnetic clutch 4... Operating member 5... Throttle wire 6
...Throttle valve 7...Control circuit 8.9...
Limit switch 10... Excitation coil 11... Vehicle speed sensor patent
Applicant: Honda Motor Co., Ltd., Mitsuba Electric Manufacturing Co., Ltd. Representative: Patent Attorney Akira Oshima - Figure 1 Figure 2 Procedural Amendment (Voluntary) 1. Display of the case 1986 Patent Application No. 57820 2 Title of the invention System for constant speed running device for vehicles 1 Circuit 3 Person making the amendment Relationship to the case Patent applicant Address 1-1 Minami-Aoyama 2-chome, Tokyo Title (5)
32) Honda Motor Co., Ltd. (1 other person) 4. Agent address: 1-8 Iidabashi, Chiyoda-ku, Tokyo 102
-6 Shibusawa Building Telephone 262-1761 6. Number of claims increased by amendment O (Contents of amendment) (1) "All questions side" in line 8 of page 7 of the specification is corrected to "all questions side." (2) "Throttle valve" on page 10 of the specification box, page 211, is corrected to "throttle valve." (3) Correct Figure 2 of the drawings as shown in the attached sheet. (that's all)

Claims (2)

[Claims] (1) A control means that calculates the traveling vehicle speed based on the vehicle speed detection signal, performs calculation control to maintain the traveling vehicle speed at a set vehicle speed, and supplies acceleration and deceleration control signals, and a motor that rotates in forward and reverse directions based on the control signal. and an actuator comprising an actuating member that performs a vehicle speed control operation and a clutch means that connects the motor to the actuating member, wherein the control means is configured to control the traveling vehicle speed when the traveling vehicle speed is A control circuit for a constant speed traveling device for a vehicle, characterized in that a clutch disengagement signal is output to the clutch means by detecting that the vehicle speed exceeds a predetermined vehicle speed that is set to be a predetermined value higher than a set vehicle speed. (2) When the control means detects that the traveling vehicle speed exceeds a predetermined vehicle speed set higher than the set vehicle speed by a predetermined value, the control means applies a deceleration control signal larger than a normal deceleration control signal to the motor for a predetermined period of time. A control circuit for a constant speed traveling device for a vehicle according to claim 1, wherein the control circuit outputs a constant speed driving device for a vehicle.