JPS5893614A - Controller for shock absorber - Google Patents

Abstract

PURPOSE:To improve stability at the time of cornering a vehicle, by controlling the piston speed of a shock absorber by making use of an output obtained through computation of information from a steering angle sensor and a car speed sensor. CONSTITUTION:When a steering 2 is revolved, a steering angle sensor 1 is actuated, and an angle signal alpha in an analogic value is generated, which is converted into an angle signal alpha' in a digitial value and applied to an arithmetic circuit 7. A car speed pulse beta' is supplied similarly to the arithmetic circuit 7. When the angle signal alpha' becomes more than a setpoint, the angle signal alpha' and a value which is increased geometrically in relation to a car speed are calculated, through values of which corresponding values to a memory 8 are read out and applied to a driving part 9 as the output signal alpha. With this, a solenoid valve 10 is actuated, a piston speed of a shock absorber is reduced and sinking at the time of cornering is prevented from occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shock absorber control device that controls the piston speed of shock absorbers installed in an automobile, and in particular uses outputs calculated from information on vehicle speed and steering wheel angle. This invention particularly relates to a shock absorber control device that stabilizes cornering.

In automobiles, a shock absorber 9 is provided to suppress the sound of the suspension spring 9 and to speed up vibration damping. The mainstream of these Shirok shock absorbers are hydraulic ones that separate fluid resistance, and these hydraulic shock absorbers have a piston inserted inside the outer cylinder that makes up the cylinder. At the same time, mineral oil is sealed in the cylinder as a fluid. Further, a part of the cylinder is provided with an orifice, and the damping of vibrations is accelerated by utilizing the braking action that occurs when oil passes through this orifice. The effectiveness of these shock absorbers is extremely delicate, and in the JI8 standard, for example, the piston speed is fixed at an optimum value from the viewpoint of tire ground contact and running stability. It is normal to set a value around the damping force at 3 s/a, and for high-speed vehicles, it is set around Q, ls*/a.

However, since the characteristics of these shock absorbers are fixed, rolling during cornering is significant.

In other words, when cornering, the vehicle speed increases.

There is a problem in that the centrifugal force increases as the acceleration and rotation angle increases, and as a result, the outer suspension sinks more than necessary, resulting in a decrease in steering stability.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a shock absorber control system for improving cornering characteristics.

To achieve this objective, the present invention controls the piston speed of a shock absorber in relation to vehicle speed and steering angle.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a shock absorption injection control device according to the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a circuit diagram showing an embodiment of a shock absorber valve control device according to the present invention. In the figure, reference numeral 1 denotes a steering angle sensor (not shown) that detects the operating angle of the steering wheel 2 in response to a steering wheel operation, and generates an angle signal α having an analog value corresponding to the operating angle. 3 is an analog-to-digital converter that converts the angle signal α into a digital value; 4 is a vehicle speed sensor that detects the rotation of the wheels and generates a vehicle speed nozzle signal β; and 5 is a vehicle speed path signal β.
A waveform shaping circuit that shapes the signal into a rectangular wave and removes noise.
6 is an oscillator that generates a clock pulse OK, and 7 is an arithmetic circuit that performs calculations by receiving the angle signal α' supplied from the analog-to-digital converter 3 and the vehicle speed pulse signal β' supplied from the waveform shaping circuit 5. The output signal r'f corresponding to the reference frame under each condition stored in the memory 8 is supplied to the drive unit 9.

Reference numeral 10 denotes a solenoid knob having a rotary configuration controlled by the moving part 9, and performs the above calculation (9) w6.
Shogazozono 11 corresponds to output signal 1r of 7.
Control is performed to reduce the opening of an orifice (not shown) provided in:C.

Shock absorber control device configured in this way,
First, when the steering angle 0 and the vehicle speed U change, the optimum piston movement speeds of the shock absorbers synergistically become smaller. In other words, as the steering angle increases, the rolling increases, and when the increase in vehicle speed is added to this, the rolling increases.Therefore, in relation to the steering angle and vehicle speed, the piston movement of the shock absorbers 11 increases. By reducing the speed, that is, by reducing the opening diameter of the orifices provided in the shock absorbers 11 using the solenoid nozzles 10, the rolling phenomenon during cornering is reduced and maneuverability is improved. . below,
The control operation will be explained in detail.

First, in the figure, the solenoid nozzle 10 is inactive under normal conditions, and the orifice of the shock absorber nozzle 11 is therefore at the maximum opening of the predetermined setting value. ing. Next, when a corner is reached and the steering lever (not shown) is operated to rotate the steering lever 2, the steering angle sensor 1 is activated and the operating angle of the steering wheel 2 relative to straight running is detected, and an analog value angle signal α is generated. generated. The angle signal α is converted into a digital angular degree signal α' in the analog-to-digital converter 3, and then supplied to the arithmetic circuit. The arithmetic circuit 7 is operated by the clock pulse OK generated from the oscillator 6, and when the angle signal α' rises above a predetermined angle value, it shifts to the shock absorber control mode. do. First, the arithmetic circuit 7 calculates the vehicle speed by inputting the vehicle speed signal βr supplied from the vehicle speed sensor 4 via the waveform shaping circuit 5 and counting, for example, the number of clock pulses OK during each cycle. is being calculated.

When the angle signal α' generated from the analog-to-digital converter 3 reaches a predetermined value or more, the angle signal α1 is calculated from the vehicle speed nozzle β', the vehicle dispatch speed, and the angle signal αl, and the angle signal α1 is calculated from the vehicle speed nozzle β'. , a value that increases synergistically in relation to α' and vehicle speed. Based on the value thus calculated, a corresponding value in the memory 8 is generated and supplied to the drive unit 9 as an output signal r. The drive s9 is operated by supplying a drive signal to a rotary type nozzle 10 in response to the output signal r supplied from the arithmetic circuit 7 to operate the shock absorber. 11
The opening diameter of the orifice provided in the piston is reduced to reduce the piston speed. Therefore, Shiso Tsuku Absono 1
1 is a node characteristic corresponding to the output signal of the arithmetic circuit 7, and as a result, sinking during cornering is prevented and rolling is reduced, resulting in a significant improvement in maneuverability.

In this case, the shock absorber is synergistically proportional to the operating angle of the steering wheel 2 and the vehicle speed. 11
Since the steering angle is made harder, the steering angle is changed to IP according to the steering angle, and when an increase in vehicle speed is added to this, the steering becomes even more difficult. In other words, when the moving speed of the cylinder is constant at shock absorption Become something. Therefore, if the steering angle 0 is large, the speed (vehicle speed) υ must be reduced, and if the speed is large, the steering angle θ must be kept small to ensure stable driving.゛On the other hand, in the embodiment shown in Fig. 1 above, the piston movement speed of the shock absorbers 11 is reduced in response to increases in steering angle and vehicle speed to vary its characteristics. Therefore, even if the steering angle increases and the vehicle speed increases, the shock absorber 11 is hardened and controlled to prevent the shock absorber from sinking. This prevents rolling and allows for stable driving.

In the above embodiment, in response to the output signal r of the arithmetic circuit 7, the shock absorber? Although the case where the piston movement speed of No. 11 is continuously controlled has been described, it goes without saying that it may be changed in one step. Also,
In the above embodiment, only the case in which characteristic control is performed on the rear shock absorber nos. 11 will be explained; Needless to say, it's a good thing.

As explained above, the shock absorber control device according to the present invention suppresses the moving speed of the shock absorbers in relation to the steering angle and vehicle speed, thereby preventing the shock absorbers from sinking. Therefore, it has an excellent effect of increasing the driving stability during cornering without affecting the comfort during normal driving.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the shock absorber system @iron according to the present invention. FIG. 2 is a diagram showing running stability characteristics. DESCRIPTION OF SYMBOLS 1... Steering angle sensor, 2... Steering, 3... Analog-digital converter, 4... Vehicle speed sensor, 5... Waveform shaping circuit, 6... Oscillator, 7
...Arithmetic circuit, 8...Memory, 9...Driver, 1
0...Runoid No No Rub, 11-Shock Abun No No.

Claims (1)

[Claims] (1) A steering angle sensor that detects the operating angle of the steering installed in the vehicle, a vehicle speed sensor that generates a vehicle speed nozzle with a period corresponding to the vehicle speed, and a vehicle speed sensor that detects the output of the steering angle sensor and the vehicle speed A pulse. An arithmetic circuit that calculates an output that corresponds to the steering operating angle and is further multiplied by the vehicle speed by calculating as an input, and a drive section that regulates the piston movement speed of the shock absorbers in response to the arithmetic output of the arithmetic circuit. What is claimed is a shock absorber control device which is characterized in that it improves stability when a vehicle is cornering.