JPS62120212A - Device for controlling suspension for automobile - Google Patents

Abstract

PURPOSE:To improve traveling stability while decelerating by making a damping force hard when a throttle closing speed becomes more than a defined value and restraining a vehicle body from sinking due to the return of said throttle. CONSTITUTION:A controller 5 receives a vehicle speed signal from an automobile speed sensor 1, while also receiving a throttle opening signal from a throttle sensor 2 via an A/D converter 4, to calculate a throttle closing speed. And, when the throttle closing speed is more than a defined value, it calculates a damping force corresponding to the vehicle speed, and outputs a variable control signal to actuators 7 via a driver 6. On the other hand, when the throttle closing speed is less than the defined value, it judges whether a brake switch 4 is on or not, and when the brake switch 4 is on, it calculates deceleration based on the automobile speed signal from the vehicle speed sensor 1.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a suspension control device for a vehicle that can suppress changes in vibration of a vehicle body during deceleration of the vehicle.

(Conventional technology) The damping force of the shock absorber used in a vehicle's suspension should be soft to improve riding comfort, but if it is not hard to a certain extent during deceleration etc., driving stability will deteriorate. .

JP-A-58-112818 ``Shock absorber control device'' discloses a vehicle braking state detecting means consisting of a vehicle speed sensor and a stop switch, and a vehicle deceleration calculation process and a stop function based on a detection signal from the vehicle braking state detecting means. It includes a calculation control means that determines whether a switch is open or closed and outputs a control signal, and a shock absorber that is controlled based on the signal from the calculation control means, and the calculated deceleration of the vehicle reaches a predetermined reference value. A configuration is disclosed in which the damping force of the shock absorber is increased by an output signal of the arithmetic and control means when the stop switch is closed or when the stop switch is closed.

In such a shock absorber control device, the initial state of deceleration is detected by a stop switch that is closed during braking.

(Problems to be Solved by the Invention) The present inventors conducted a behavior test during braking of a vehicle equipped with the above-described device.

FIG. 7 is a diagram showing the results of a behavior test during braking of a vehicle equipped with a conventional suspension control device.

The results of this behavior test showed that during deceleration, the attitude of the vehicle had already changed before the brake switch was turned on. This seems to be due to the return of the throttle. Therefore, deceleration control is required before the brake switch is turned on.

An object of the present invention is to provide a suspension control device for a vehicle that can further improve running stability during deceleration by suppressing vibration changes in the vehicle body not only during deceleration but also before deceleration. .

(Means for Solving the Problems) To achieve the above object, a vehicle suspension control device according to the present invention ζ5 is a vehicle suspension control device that controls the strength of a suspension by varying the damping force of a shock absorber. , a damping force variable mechanism for steplessly controlling the damping force of the shock absorber; a vehicle speed sensor for detecting the traveling speed of the vehicle; a throttle sensor for detecting the opening degree of a throttle valve; a damping force control circuit that calculates a closing speed and outputs a variable damping force control signal according to the vehicle speed from the vehicle speed sensor when the closing speed exceeds a certain value; and a drive section that drives the variable damping force mechanism.

(Example) Hereinafter, the present invention will be described in detail with reference to the drawings and the like.

Fig. 1 is a block diagram showing an embodiment of a vehicle suspension control device according to the present invention, Fig. 2 is a system installation diagram of the embodiment device, and Fig. 3 is a controller used in the embodiment device. Flowchart for explaining the operation of
5 and 5 are diagrams showing a control map used in the controller, and FIG. 6 is a diagram showing an embodiment of a damping force variable mechanism used in the device of the embodiment.

In Fig. 1, 1 is a vehicle speed sensor, 2 is a throttle sensor, 3 is an A/D converter, 4 is a brake switch, and 5 is a
is the controller, and 6 is the driver.

7 is a damping force adjustment actuator.

The vehicle speed sensor 1 is a sensor that detects the traveling speed of the vehicle, and is, for example, a reed switch type sensor, and its output is connected to the controller 5.

The throttle sensor 2 is a sensor that detects the opening degree of a throttle valve, and is arranged, for example, at a carburetor as shown in FIG.

The output of the throttle sensor 2 is digitally converted by an A/D converter 3 and then connected to a controller 5.

The controller 5 calculates the damping force of the shock absorber according to the flowchart shown in FIG. 3, and generates and outputs a variable control signal.

The output of the controller 5 is connected to a damping force adjustment actuator 7 via a driver 6.

The damping force adjustment actuator 7 is connected to the left and right front suspensions 91. It is for driving the variable damping force mechanism 8 of the shock absorber provided in the left and right rear suspensions 92 (FIG. 2), and uses, for example, a solenoid.

21i! i. The variable force mechanism 8, as shown in FIG.
Cylinder 81 and piston 8 sliding inside the cylinder 81
2, a piston rod 83 provided in the piston 82, a control rod 84 rotatably provided in the piston rod 83, and a control rod 84.

- A control rod 84 consisting of a disk 85 provided on a control rod 84 and driven by an actuator tough.
By continuously changing the orifice diameter of the disc 85 by rotating the disc 85, the damping force of the shock absorber can be varied steplessly.

Next, the operation of the vehicle suspension control device according to the present invention will be explained, focusing on the operation of the controller 5.

The controller 5 inputs a vehicle speed signal from the vehicle speed sensor 1 (101). Furthermore, the controller 5 inputs the throttle opening signal from the throttle sensor 2 via the A/D converter 4 (102), and controls the throttle closing speed TC.
(103) is calculated.

Next, it is determined whether the throttle closing speed TC is above a certain value (104), and when it is above a certain value, the damping force according to the vehicle speed is calculated according to the MA knob 1 shown in Fig. 4 and variable control is performed. A signal is output (105).

When the throttle closing speed TC is smaller than a certain value,
Determine whether brake switch 4 is on or not (106)
.

When the brake switch 4 is on, the deceleration is calculated based on the vehicle speed signal from the vehicle speed sensor 1.
), the damping force corresponding to the deceleration is calculated according to map 2 shown in FIG. 5, and a variable control signal is output (108), and a counter value T is set in the deceleration control counter (109).

When the brake switch 4 is off, it is determined whether the damping force control counter is O or not (11Q).

When the deceleration control counter is at the set value T, the damping force control signal is held at the final damping force for a certain period of time (1
12).

Note that since the damping force control counter is initialized to 0, the deceleration control damping force is not varied except during deceleration operation.

(Effects of the Invention) As explained in detail above, according to the present invention, when the throttle closing speed exceeds a certain value, the damping force is made hard to prevent the vehicle body from sinking due to the throttle return. Therefore, there is an effect that running stability during deceleration can be further improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a vehicle suspension control device according to the present invention, FIG. 2 is a system installation diagram of the device of the embodiment, and FIG. 3 is a controller used in the device of the embodiment. Flowchart for explaining the operation of
5 and 5 are diagrams showing a control map used in the controller, and FIG. 6 is a diagram showing an embodiment of a damping force variable mechanism used in the same embodiment device. FIG. 757 is a diagram showing the results of a behavior test during braking of a vehicle equipped with a conventional suspension control device. 1... Vehicle speed sensor 2... Throttle sensor 3... A/D converter 4... Brake switch 5... Controller 6... Driver 7... Damping force adjustment actuator 8... Damping Force Variable Mechanism Patent Applicant Suzuki Automatic Gun Industry Co., Ltd. Agent Patent Attorney Inoro Teeth 1, 2, 3. Figure 25 (Ma (Shiv 1)
(7..Noah Z) 6th grade procedural amendment document March 18, 1986

Claims (1)

[Claims] A vehicle suspension control device that controls the strength of a suspension by varying the damping force of a shock absorber, comprising: a damping force variable mechanism that steplessly controls the damping force of the shock absorber; and a vehicle speed sensor that detects the running speed of the vehicle. a throttle sensor that detects the opening degree of the throttle valve, and a throttle closing speed calculated from the output of the throttle sensor, and when the closing speed exceeds a certain value, a damping force is applied according to the vehicle speed from the vehicle speed sensor. 1. A suspension control device for a vehicle, comprising: a damping force control circuit that outputs a variable control signal; and a drive section that drives the damping force variable mechanism based on the output of the damping force control circuit.