JPS59153608A - Controlling method of level-control device - Google Patents

Abstract

PURPOSE:To make car driving at an uneven ground ever so easy as well as to make improvements in running stability at a high speed, by making a car level alterable into the specified level position by manual operation, while constituting the said car level to be lowerable automatically in case of going beyond the fixed car speed. CONSTITUTION:In case of a level-control device capable of setting a standard car level and a first car level being higher than the former, a controller 20 is provided with a controlling part capable of setting asecond car level being higher than the first car level, besides the said car level setting control part. And, when the second car level setting control part of the controller 20 is manually controlled, a compressor 1 is driven by a motor 2, and compressed air is fed to each of dampers 8-11 via solenoid valves 6 and 7, then the car level is raised up till each of car speed sensors 17 and 18 detects that the car level reaches the second car level position. Under this condition, when a car speed sensor 19 detects a specified high-speed state, the compressed air inside these dampers 8-11 is exhausted whereby the car level is made so as to be lowered down.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of controlling a vehicle height adjustment device having a particularly high vehicle height position.

Vehicle height adjustment devices are installed in passenger cars, etc., and are used to keep the vehicle height constant regardless of increases or decreases in the number of passengers, or to maintain a high vehicle height when road conditions are poor to improve driving performance. can be taken as a thing.

The present inventor has created the present invention in order to further improve the vehicle height adjustment device described above.

An object of the present invention is to provide a particularly high vehicle height position in a vehicle height adjustment device, and by adjusting the vehicle height to this height position, driving on a highly uneven road surface is facilitated. According to the present invention, it is an object of the present invention to provide a control method for a vehicle height adjustment device that can reduce the radius of rotation.

A feature of the present invention is that, in the conventional vehicle height adjustment device, the vehicle height is adjusted to a particularly high vehicle height position using a manual operation device, and when the vehicle speed exceeds a predetermined speed, the vehicle height is automatically set in advance. The reason is that the height of the vehicle can be lowered to the standard set by the government.

Embodiments of the present invention will be described below based on the accompanying drawings.

The drawings show a pneumatic circuit of a vehicle height adjustment device according to the present invention and an electrical system for controlling the operation of each component of this pneumatic circuit.

In the drawings, 1 is a compressor, and this compressor 1 is operated by the rotating operation of a compressor 2. The suction port of the compressor 1 communicates with a suction/discharge port that communicates with the atmosphere and is equipped with a filter 3, while the discharge port of the compressor 1 communicates with a dryer 4,
It is connected to left and right front dampers 8.9 and rear dampers 10.11 via a solenoid valve 6.7 which is normally closed by a check valve 5 and springs 5a and 7a.

The dryer 4 is for removing moisture from the air, and the solenoid valves 6.7 are solenoid valves 6b and 7.
This is a vehicle height adjustment valve that opens when b is excited to allow bidirectionally compressed high-pressure air to pass through. Dampers 8 to 11 are installed in the front and rear wheel suspension systems, respectively, and are used to support and suspend the load applied to the vehicle. High-pressure air is stored inside the dampers 8 to 11, and the height of the vehicle is reduced by shortening and expanding the air. It has a diaphragm that can be adjusted. The vehicle height increases as the compressed air supplied by the compressor 1 increases and the pressure within the diaphragm increases.

A bypass air passage 13 having a check valve 12 facing in the opposite direction to the check valve 5 is provided differentially to the check box 5 . This air passage 13 is a passage used during exhaustion.

Further, a branch part a is provided on the discharge port side of the compressor 1, and an exhaust passage leading to the filter 3 is branched, with an exhaust solenoid valve 14 that is normally kept closed by a spring 14a interposed therebetween. It will be established.

15 is a drain for releasing air pressure when it rises too much.

The electrical system has a control circuit 16 composed of a computer or the like at its center, and this control circuit 16! The system detects changes in vehicle height based on relative positional changes between a sprung portion consisting of the vehicle body, etc., and an unsprung portion consisting of the wheels, etc., which is disposed close to the front and rear wheel suspension systems. Detection signals from vehicle height sensors 17 and 18, detection signals from vehicle speed sensor 19, and command signals from an operating device 20 capable of issuing various operation commands are input, and on the other hand, a power source for electric motor 2 is input from control circuit 16. It is configured to output a signal for controlling the operation of each solenoid 6b, 7b, 14b of the valve 6.7.14.

In the above, the vehicle height sensors 17 and 18 have a detection section that detects that the vehicle is within the reference vehicle height range and a detection section that detects the first high position as in the conventional case, and further includes a detection section that detects the first high position. It has a detection section that detects the second high position. Further, the operating device 20 is newly provided with an operating section that can adjust the vehicle height to the second particularly high vehicle height position.

In the above, the vehicle height adjustment device is usually the vehicle height sensor 17.1.
Receives a signal from B as to whether or not the vehicle height is within the standard vehicle height range, and operates to maintain the vehicle height at a constant level regardless of changes in load such as increases or decreases in the number of passengers on the vehicle. . in this case,
By starting the compressor 1 and opening the solenoid valve 6.7, compressed air is supplied to the dampers 8 to 11, raising the vehicle height, and conversely, the solenoid valves 5 and 7.14 are raised.
By opening, the compressed air inside the bolts 8 to 11 is discharged to the outside, lowering the vehicle height.The control circuit controls the operation of each element.

Also, when adjusting the vehicle height to the first high position, by operating the related operation part, the vehicle height can be adjusted to the first high position in the same manner as above.
Can be adjusted to a high position.

Next, by manually operating the operating section of the operating device 20 at the second high position, the electric motor 2 will cause the compressor 1 to
operates to generate compressed air, which is supplied to the diaphragms in the dampers 8 to 11 through the opened solenoid valve 6.7, raising the vehicle height and increasing the second air pressure from the vehicle height sensor 17, 1B. When it receives a signal that the vehicle is at a high position, it stops adjusting the vehicle height.

If the vehicle height is at the second high position, the vehicle height is set to be extremely high. This causes ruts, snowy roads,
Enables driving on uneven terrain such as roads with relatively high unevenness. Furthermore, for example, in a vehicle equipped with a strut-type suspension system, if the vehicle height is extremely high as described above, the tread will be reduced, so the position of the outer wheel will move toward the center when turning, reducing the turning radius. can.

When the vehicle height is tilted to the second high position and the vehicle speed reaches a certain high speed state, this is detected by the vehicle speed sensor 19, and based on this detection signal, the control circuit 16 sends a signal to lower the vehicle height. This will set the vehicle height to the standard vehicle height or the first
It is adjusted so that it is at a high position. This allows good operability to be maintained.

In the above embodiment, a vehicle height adjustment device constructed of a pneumatic circuit has been described, but it is of course applicable to a vehicle height adjustment device employing a hydraulic circuit or the like.

As is clear from the following explanation, according to the present invention, driving on uneven terrain such as ruts and snowy roads is facilitated by setting a special vehicle height adjustment position that allows the vehicle height to be extremely high. In addition, for a given suspension type, the effective turning radius can be reduced, ease of operation,
Stability can be improved. Additionally, when the vehicle speed exceeds a certain level, the vehicle height is automatically lowered from a high position, improving maneuverability and stability.

[Brief explanation of drawings]

The drawings show a pneumatic circuit of a vehicle height adjustment device according to the present invention and an electrical system for controlling the operation of each component of this pneumatic circuit. In the drawing, 1 is the compressor, 2 is the electric motor, 6°7.1
4 is a solenoid valve, 8 to 11 are dampers, 16 is a control circuit, 17.18 is a vehicle height sensor, 19 is a vehicle speed sensor, 2
0 is an operating device.

Claims (1)

[Claims] In a vehicle height adjustment device that sets at least a normal vehicle height, or even a higher vehicle height, a higher vehicle height is set at a particularly high vehicle height position, and the vehicle height is adjusted manually to a particularly high vehicle height position. 1. A control method for a vehicle height adjustment device, characterized in that the vehicle height is automatically lowered when the vehicle speed exceeds a certain speed.