JPH01197132A - Constant speed running device for vehicle - Google Patents

Abstract

PURPOSE:To satisfactorily holding both multipulating stability and running stability of a vehicle by automatically controlling the acceleration of the vehicle so as to decrease the acceleration rate of the vehicle when a turn of the vehicle is detected, upon acceleration during constant running control. CONSTITUTION:A vehicle constant speed running device detects a running speed of a vehicle and controls the running speed so as to make the running speed to approach a desired set speed. In this arrangement, there is provided a turn detecting means 51 for detecting a turn of the vehicle. Further, there is provided an acceleration control means 52 for controlling an actuator 53 so as to control the acceleration rate of the vehicle in response to a turn of the vehicle detected by the turn detecting means 51 upon acceleration during constant speed running control. That is, when the vehicle turns upon acceleration during constant speed running control, the acceleration rate of the vehicle is automatically reduced. With this arrangement, it is possible to satisfactorily maintain both manipulating stability and running stability of the vehicle.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a constant speed traveling device for a vehicle that automatically controls the traveling speed of a vehicle such as an automobile to maintain it constant.

(Prior Art) Conventionally, as disclosed in, for example, Japanese Utility Model Application Publication No. 59-85345, when a vehicle is running, when the vehicle speed reaches a desired speed, the vehicle speed is set by the driver's operation. A constant speed driving system is known in which the set vehicle speed is memorized and the throttle valve of the engine is automatically controlled by an actuator so as to maintain this set vehicle speed thereafter.

In such a constant speed driving device, in the constant speed driving control state, the constant speed driving control state is canceled when the driver depresses the brake pedal or the clutch pedal (in the case of a manual transmission vehicle). It looks like this. Furthermore, if the vehicle approaches a boarding road during constant speed driving control and the vehicle speed drops by a predetermined value or more compared to the set vehicle speed, constant speed driving control is canceled, but after that, the resume switch is turned ON. By doing so, it is possible to return to the set vehicle speed before cancellation.

However, in conventional constant speed driving systems, even when the car turns a curve while accelerating by turning on the resume switch, the acceleration control is performed in the same way as when driving straight. In this case, a large amount of centrifugal force is applied to the vehicle, which may cause the driver to feel uneasy and reduce driving stability, especially on low-μ roads, so further improvements are needed.

(Object of the Invention) Therefore, it is an object of the present invention to provide a constant speed traveling device for a vehicle that can effectively solve the above-mentioned problems that occur when an automobile turns during acceleration during constant speed traveling control. .

(Structure of the Invention) As shown in FIG. 1, the present invention includes a turning detection means 51 that detects turning of the vehicle, and a turning detector 'lG51 that detects turning of the vehicle during acceleration during constant speed driving control. The present invention is characterized in that it includes an acceleration control means 52 that controls an actuator 53 so as to reduce the acceleration rate of the vehicle in response to this.

(Effects of the Invention) According to the present invention, when the vehicle turns during acceleration during constant speed driving control, the actuator is controlled to reduce the acceleration rate. can be prevented from becoming unstable.

(Embodiments) Hereinafter, embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 2, the constant speed traveling device has a control device 5 connected via a main switch 4 to a power supply circuit 3 led from a battery 1 via an ignition switch 2. Signals from a set switch 6, a resume switch 7, and a coast switch 8 as vehicle speed setting means, a signal from a vehicle speed sensor 9, and a signal from a steering angle sensor 25 that detects the steering angle of the front wheels are input. Further, a drive current is supplied from the control device 5 to the motor 11 and the electromagnetic clutch 12 of the actuator 10.

The set switch 6, resume switch 7, and coast switch 8 are connected between the control device 5 and the ground, but when the vehicle speed indicated by the signal from the vehicle speed sensor 9 is within the range of, for example, 40 to 110 kffI/h. When the desired vehicle speed is reached, turn the set switch 6 to O.
By operating N, the vehicle speed at that time can be set as the set vehicle speed for constant speed driving. Further, the resume switch 7 is used to turn the constant speed running control off when the constant speed driving control is canceled due to a reason other than the FF operation of the main switch 4.
By operating N, the vehicle speed is returned to the set speed before the release. Furthermore, the coast switch 8 is used when decelerating the vehicle while traveling at a constant speed, and the vehicle speed decreases when it is turned on.

Then, the operation of these switches 6 to 8 and the vehicle speed sensor 9
The control device 5 controls the motor 11 of the actuator 10 and the electromagnetic clutch 12 based on the signal from the steering angle sensor 25 and the signal from the steering angle sensor 25.

The actuator 10 includes a motor 11 and an electromagnetic clutch 12
．． It is composed of two limit switches 13, 14 and a planetary gear mechanism (not shown), and the motor 11 can be rotated forward or reverse by changing the polarity of the power supply. Further, the electromagnetic clutch is normally in an ON state, and in this ON state, the internal gear of the planetary gear mechanism is fixed, and it is turned OFF only when the constant speed driving control is released, and the internal gear is in a free state. Furthermore, limit switches 13 and 14 are installed to prevent motor burnout due to continuous acceleration and deceleration modes.
The motor power is canted when the throttle valve is fully opened and closed.

Furthermore, this constant speed traveling device is provided with a group of cancel switches between the power source 1 and the control device 5 as means for generating a cancellation command for canceling the constant speed traveling control.

In other words, it is turned on by depressing the brake pedal.
A stop switch 15 that turns on and a taratch switch 16 that turns on to 0N4i'' when the clutch pedal is operated (MT cars only) are arranged in parallel, and also turns on when the brake is operated to turn on the stop lamp 17. A stop lamp switch 18 for turning on the light is also connected to the control device 5.Furthermore, in an electronically controlled automatic transmission vehicle, the switch is turned on only when the selector is in the P or N position, and the starter motor 19 is activated. An inhibitor switch 20 is provided which enables this, and this switch 20 is also connected to the control device 5. 21 is a control unit of the electronic control A T device.

On the other hand, the control device 5 includes a vehicle speed memory setting circuit 2 to which signals from the center switch 6, resume switch 7, coast switch 8, etc. and signals from the steering angle sensor 25 are supplied.
2, a switching mode circuit 23 that can be switched between normal acceleration mode, hold mode, deceleration mode, or cancel mode and generate corresponding outputs, two relays Ryl, Ry2, and these relays Ry1, Ry.
2, and a transistor Tr3 for turning the electromagnetic clutch 12 ON-OFF.

The configuration of one embodiment of the constant speed traveling device according to the present invention has been described above. Next, the operation in each mode will be explained.

(1) When driving at a constant speed, main switch 4 is turned on while driving with normal accelerator operation.
state, at any given speed (40-110km/h
), when the set switch 6 is turned on, the vehicle speed is stored in the vehicle speed storage setting circuit 22 in the control device 5, and at the same time, the switching mode circuit 23 is set to the normal acceleration mode. Then, transistor Tri turns on, relay Ryl switches to the power supply side, and transistor Tr3 turns on.
become. Therefore, in the actuator 10, the electromagnetic clutch 12 is turned on, and the motor 11 rotates forward due to the operation of the relay Ryl, which pulls the accelerator wire, thereby increasing the vehicle speed.

When the vehicle speed reaches the set speed, the vehicle speed memory setting circuit 22 switches the switching mode circuit 23 to the hold mode, and turns the transistor Tri off while keeping the transistor Tr3 on.
By turning OFF, relay Ryl is turned OFF and motor 11 is stopped.

Then, the accelerator wire is held only by the operation of the electromagnetic clutch 12, and a constant speed state is maintained.

(2) Speed change while driving at a constant speed While driving at a constant speed at any speed, if you want to increase the set speed, keep the cent switch 6 ON again, the switching mode circuit 23 becomes the normal acceleration mode, Increase the vehicle speed. Then turn off the set switch 6.
At that point, the vehicle speed at that time is stored in the vehicle speed memory setting circuit 22.

Also, if you want to lower the set speed, use the coast switch 8
By continuing to turn ON, the switching mode circuit 23 enters the deceleration mode, transistor Tr2 and relay Ry2 turn ON, the motor 11 reverses, and the vehicle speed decreases, and when the coast switch 8 is turned OFF, the speed decreases. The current vehicle speed is memorized.

(3) Cancellation of constant speed driving control If, for example, the brake pedal is pressed during constant speed driving control, stop switch 15 of the cancel switch group
Then, the stop lamp switch 18 is turned on, and the switching mode circuit 23 detects the release command from these cancel switches and enters the cancel mode, and all transistors Tri to Tr3 are turned off. Therefore, the electromagnetic clutch 12 is turned off, the accelerator wire is returned to its original state, and constant speed driving control is canceled. However, in this case, the vehicle speed before cancellation stored in the vehicle speed memory setting circuit 22 will not be erased unless the ignition switch 2 or main switch 4 is turned to FFL. The constant speed driving control is also canceled when the actual vehicle speed drops by 15±2 km/h or more from the set vehicle speed due to a sudden change in road conditions.

(4) Return of constant speed driving control After canceling constant speed driving control, operate the accelerator again to reduce the vehicle speed by approximately 4
When the vehicle speed is maintained at Qkm/h or higher and the resume switch 7 is turned on, the vehicle speed returns to the set speed before cancellation and constant speed driving control is restarted. Then, the transistor Tri is turned on, the relay Ry1 is switched to the power supply side, and the transistor Tr3 is turned on. Then, acceleration is started in order to bring the actual vehicle speed closer to the set vehicle speed stored in the vehicle speed storage setting circuit 22.

During acceleration due to the ON operation of the resume switch 7,
When the vehicle turns a curve and the steering angle sensor 25 detects a turn, the control device 5 controls the actuator 10 to reduce the throttle opening to reduce the acceleration rate, but the degree of reduction in the acceleration rate depends on the steering angle amount. It is pre-programmed to grow in proportion to. Further, a certain threshold value is set for the output voltage of the steering angle sensor 25 made of a potentiometer, and the above-mentioned acceleration rate reduction control is performed only when the output of the steering angle sensor 25 exceeds this threshold value. It is now possible to

In FIG. 3 [al, ('b), the resume switch 7 is set to OFF.
This is a graph showing the relationship between the vehicle speed and the time from when the N operation is performed until the vehicle speed returns to the set vehicle speed.
When traveling straight, the vehicle speed returned to the set speed after a short period of time T1, whereas during the turn shown in FIG. This indicates that it took

In the above-described embodiment, the turning of the vehicle is detected by the steering angle sensor 25, but instead of the steering angle sensor 25, the lateral G
A sensor may be used to detect the turning of the vehicle.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a constant speed traveling device according to the present invention, and FIG.
The figures are circuit configuration diagrams of embodiments of the present invention, and Figures 3 (al, (b)
1 is a graph showing the return state of the vehicle speed when the vehicle is traveling straight and when turning when the resume switch is operated. . 4- Main switch 5- Control device 6- Cent switch 9- Vehicle speed sensor 10- Actuator 11- Motor 12- Electromagnetic clutch 22 Vehicle speed memory setting circuit 23- Switching mode circuit 25- Rudder angle sensor

Claims (1)

[Claims] A constant speed running device for a vehicle that detects the running speed of a vehicle and controls the running speed to approach a desired set speed, comprising: a turning detection means for detecting a turn of the vehicle; and constant speed running. The present invention is characterized by comprising: acceleration control means for controlling the acceleration rate of the vehicle to be reduced in response to the detection of a turn of the vehicle by the turning detection means during acceleration during control; Constant speed running device for vehicles.