JPS6337723B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of controlling a vehicle height adjustment device that can raise the height of a vehicle while maintaining a proper front and rear posture of the vehicle.

A vehicle height adjustment device is installed in a vehicle such as a passenger car to maintain a good riding feeling, and specifically, when the vehicle height changes due to an increase or decrease in the load applied to the vehicle body. Adjust the vehicle height to always maintain the vehicle height at the standard height, or change the vehicle height to be higher than the standard height as necessary when driving on rough terrain. It is something.

Conventionally, something like a pressure accumulation chamber is provided in a damper installed in a suspension system that supports the front and rear wheels of a vehicle, and high-pressure air is supplied to this damper using, for example, a compressor, or an exhaust valve is opened. There is a vehicle height adjustment device that can raise or lower the height of a vehicle by removing high-pressure air from a damper. In such a vehicle height adjustment device, for example, if the compressor is disposed at the front side of the vehicle, the air passage connected to the damper provided in the rear wheel suspension system will inevitably be , is longer than the air passage connected to the damper provided for the front wheel suspension. Therefore, if the compressor is operated to raise the vehicle height and the electromagnetic valves provided in the air passages for the front and rear wheels are simultaneously opened to supply high-pressure air to each damper, the air passages for the rear wheels are longer. The damper used for this purpose has a long passage length and the cross-sectional area of the passage is made small for durability, which increases the passage resistance.This causes a difference in the air pressure stored in the damper between the front and rear wheels. The air pressure in the damper on the wheel side decreases, resulting in a problem in that the adjusted vehicle height differs between the front and rear, resulting in an inappropriate vehicle height posture.

The present inventor has created the present invention in view of the above-mentioned problems in the vehicle height adjustment device and to effectively solve the problems.

An object of the present invention is to provide a vehicle height adjustment device in which a compressor that increases the vehicle height by supplying high-pressure air to each damper is disposed biased toward either the front or rear side of the vehicle. Because the lengths of the air passages in the front wheel damper and the rear wheel damper are different, there is a difference in the air pressure delivered to the front and rear wheel dampers, which causes a slight difference in vehicle height between the front and rear wheels. The vehicle height is designed to solve this issue and generate the required air pressure in each damper to equalize the height of the front and rear of the vehicle even if the lengths of the air passages are different, allowing for quick and even vehicle height adjustment. An object of the present invention is to provide a method for controlling a regulating device.

In order to achieve the above object, the present invention has the following features:
When raising the vehicle height, a solenoid valve is installed in an air passage that is opened to supply high-pressure air generated by a compressor to each damper, for example.
The electromagnetic valve of the air passage having a long passage length is opened first, and the electromagnetic valve of the air passage having a short passage length is opened after a certain period of time.
The purpose is to eliminate the influence of passage resistance.

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows a pneumatic circuit of a vehicle height adjusting device according to the present invention and an electrical system for controlling the operation of each component of this pneumatic circuit.

In FIG. 1, 1 is a compressor, and this compressor 1 is operated by the rotation of an electric motor 2. In FIG. The intake port of compressor 1 is
It leads to an intake/exhaust port 3 equipped with a filter that communicates with the atmosphere,
On the other hand, the discharge port of the compressor 1 is connected to the left and right front dampers 8, 9, and the rear dampers 10, 11 via the dryer 4, the check valve 5, and the solenoid valves 6, 7 which are normally closed by the springs 6a, 7a.
are connected to each other by respective air passages 12 and 13. The dryer 4 is for removing moisture from the air, and the valves 6 and 7 are for allowing compressed high-pressure air to pass in either direction when the solenoids 6b and 7b are energized. This is a two-way valve for vehicle height adjustment that opens. Dampers 8 to 11 are installed in the suspension systems of the front wheels and rear wheels, 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 increased by shortening or expanding the dampers. 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 15 having a check valve 14 facing in the opposite direction to the check valve 5 is arranged in parallel to the check valve 5 . This air passage 15 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 suction/discharge port 3 is provided with a solenoid valve 16 for exhaust which is normally maintained in a closed state by a spring 16a. are set up in a branched manner. Further, 17 is a drain for releasing air pressure when it rises too much.

On the other hand, the electrical system is provided with a control circuit 18 composed of a computer or the like at its center, and this control circuit 18 is arranged close to the front and rear suspension systems of the vehicle, and is connected to sprung parts such as the vehicle body. Detection signals from vehicle height sensors 19 and 20 that detect changes in vehicle height based on changes in the relative position between the vehicle and an unsprung portion of a wheel, etc., and command signals from an operating device 21 that can issue various operation commands are input. , while the control circuit 18 supplies the power supply section 2a of the electric motor 2 and the valves 6, 7, 16.
It is configured to output a signal for controlling the operation of each of the solenoids 6b, 7b, and 16b.

In the above, the compressor 1 is a vehicle body 2 having front and rear wheels 22 as shown in FIG.
3. For example, it is installed at the front of the vehicle body.
For this purpose, compressor 1 and front wheel dampers 8 and 9 are installed.
compressor 1 than the air passage 12 connecting
and an air passage 1 connecting the dampers 10 and 11 for the rear wheels.
3 is longer.

Therefore, when adjusting the vehicle height to increase the front and rear height of the vehicle, as shown in FIG. After a delay, the valve 7 disposed in the air passage 13 is opened first, and then after a certain period of time, the valve 7 disposed in the air passage 12 is opened.
The valve 6 disposed at is opened. When the vehicle height is raised by the control circuit 18, if the control is performed as described above, high-pressure air will be supplied to the dampers 10 and 11 on the rear wheel side first, and the high-pressure air will be supplied for the preceding time _t1 . The pressure in the dampers 10 and 11 becomes higher than that in the dampers 8 and 9 on the front wheel side first, but since the air passage 13 has a higher resistance than the air passage 12 due to the difference in length, they cancel each other out and finally increase the pressure on the front wheels. The air pressure of the dampers 8, 9 on the side and the dampers 10, 11 on the rear wheel side becomes the required pressure, so that the heights of the front and rear of the vehicle can be made equal. Further, in order to produce such an effect, the delay time t ₁ is appropriately determined depending on the difference in length between the air passages 12 and 13.

When the vehicle height adjustment is completed, a signal is sent from the control circuit 18 to the electric motor 2 and the valves 6 and 7, and at the same time, the electric motor 2 is stopped and the valves 6 and 7 are closed, thereby controlling the vehicle height adjustment. will end.

According to the above embodiment, the case where the compressor 1 is disposed on the front side of the vehicle has been described, but generally speaking, the difference in the length of the air passage that occurs when the high-pressure air supply means is disposed off-centered on the vehicle. Therefore, it can be applied to a vehicle height adjustment device in which a difference occurs in the vehicle height adjustment at the front and rear of the vehicle. Further, the same configuration can be used when adjusting the vehicle height using other hydraulic pressure or the like.

As is clear from the above explanation, according to the present invention, even if the length of the air passage to each damper differs due to the compressor being disposed in a biased position in the vehicle height adjustment device, for example, the length of the air passage to each damper is The air pressure required for each damper can be supplied to each damper without being affected by the difference between the two, and the vehicle height can be quickly adjusted by equalizing the vehicle heights at the front and rear of the vehicle.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and Fig. 1 is a circuit diagram showing the pneumatic circuit and its control circuit of the vehicle height adjustment device according to the present invention, and Fig. 2 shows the arrangement position of the compressor in the vehicle and the air passage. FIG. 3, which shows the relationship, is a time chart for explaining the operation. In the drawing, 1 is a compressor, 2 is an electric motor,
6 is a solenoid valve in the front wheel air passage, 7 is a solenoid valve in the rear wheel air passage, 8 and 9 are front dampers, 10 and 11 are rear dampers, 16 is an exhaust solenoid valve, and 18 is a control circuit.

Claims (1)

[Scope of Claims] 1. High-pressure fluid is supplied from a pump disposed on one side of the front and rear of the vehicle to a damper provided in each suspension device supporting the front wheels and rear wheels via a front wheel fluid passage and a rear wheel fluid passage. In a vehicle height adjustment device for raising the vehicle height by supplying water, when a request to simultaneously raise the front wheels and rear wheels occurs, passages provided in the front wheel fluid passage and the rear wheel fluid passage are opened and closed. A control for a vehicle height adjustment device characterized in that among solenoid valves for use in a car, a solenoid valve with a long fluid passage is opened first, and a solenoid valve with a short fluid passage is opened after a certain period of time. Method.