JPS59130715A - Control method for vehicle height adjustment device - Google Patents

Abstract

PURPOSE:To enable uniform adjusting of car height by first opening one value associated with longer path in solenoid paths for opening/closing front/rear wheel fluid paths while delaying opening of another associated with shorter path for predetermined time. CONSTITUTION:When adjusting car height, a control circuit 18 will first drive a compressor 1 to open a valve 7 arranged in a longer air path 13. Thereafter a valve 6 arranged in another air path 12 is opened with specific delay. Consequently the air resistance due to the difference of length between air paths 12, 13 is corrected to adjust front/rear wheel dampers 8-11 uniformly thus to maintain correct position.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of controlling a vehicle height adjustment device that can raise the vehicle height by setting the vehicle in an appropriate posture in all front and rear directions.

A vehicle height adjustment device is a device installed in a vehicle such as a passenger car to maintain a good riding feeling.Specifically, it is necessary to adjust the vehicle height when the vehicle height changes due to an increase or decrease in the load applied to the vehicle body. Always maintain the vehicle height at the standard height, or adjust the vehicle height such as by changing the vehicle height so that it is higher than the standard height as necessary when driving on rough terrain. It is something.

Conventionally, something like a pressure accumulation chamber was provided in a damper installed in a suspension system that supported the front and rear wheels of a vehicle, and high-pressure air was supplied to the damper using, for example, a compressor, or an exhaust valve was opened. There are vehicle height adjustment devices that are used to 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 combrezzar mentioned above is installed on the front side of the vehicle, the air passage connected to the damper installed in the rear wheel suspension system will necessarily be connected to the front wheel suspension system. The damper installed in the air passage will be longer than the connected air passage. Therefore, the combination sensor is activated to raise the vehicle height, and the electromagnetic valves installed in the air passages for the front and rear wheels are simultaneously opened to supply high-pressure air to each coupe.
Dampers for the rear wheels, which have long air passages, have a long passage length and the cross-sectional area of the passage is made small in terms of durability, so the passage resistance is large (because of this, the air is stored in the damper on the front and rear wheel sides). This causes a difference in the air pressure in the rear wheel damper, which reduces the air pressure in the damper on the rear wheel side.As a result, the adjusted vehicle height differs between the front and rear, resulting in an incorrect vehicle height posture.

In view of the above-mentioned problems in the vehicle height adjustment device, the inventor of the present invention has devised an effective solution to the problem (the present invention has been made).

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 air passages of the front wheel damper and the rear wheel damper have different lengths, there is a difference in the air pressure delivered to the front and rear wheel dampers, causing the vehicle height to be slightly different at the front and rear. Vehicle height adjustment designed to eliminate this problem and generate the required air pressure in each tamper so that the height of the front and rear of the vehicle is equal even if the lengths of the air passages are different, so that the vehicle height can be adjusted evenly. The object of the present invention is to provide a method for controlling a device.

In order to achieve all of the above objects, the present invention is characterized by an electromagnetic air passage provided with an air passage π that is opened to feed high-pressure air generated by a compressor to each damper when the vehicle height is increased. The valve is configured to first open the solenoid valve of the air passage with a long passage length, and then open the solenoid valve of the air passage with a short passage length by mistake at a certain time, thereby eliminating the influence of passage resistance. 1. Hereinafter, a preferred embodiment of the present invention will be described in detail 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 the pneumatic circuit.

In FIG. 1, 1 is a compressor, and this compressor 1 is operated by the rotation of an electric motor 2. As shown in FIG. The inlet of the compressor 1 communicates with an inlet/outlet 3 equipped with a filter that communicates with the atmosphere, while the outlet of the compressor 1 has a dryer 4, a check valve 5, and a solenoid valve 6, which is normally closed by springs 6a and 7a. 7 to left and right front dampers 8, 9, rear dampers 10, 11V
c, and are connected by respective air passages 12 and 13Vc. The dryer 4 is for removing moisture from the air, and the valve 6.7 is designed to allow 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. The dampers 8 to 11 are installed in the front and rear wheel suspension systems, respectively, and support the entire load applied to the vehicle.High pressure air is stored inside the dampers 8 to 11, and the vehicle height is adjusted by shortening and expanding the dampers. It has a diaphragm that can The compressed air supplied by the compressor 1 increases, and the pressure inside the diaphragm increases (the vehicle height becomes higher).

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, the discharge port side of the compressor 1 is provided with a branch part a, and an exhaust passage leading to the suction/discharge port 3 is provided with an exhaust solenoid/valve 16, which is normally maintained in a closed state by a spring 16alc, in the middle. are set up in a branched manner. Further, 17 is a θ] 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 the control circuit 18 is disposed close to the front and rear suspension systems of the vehicle, and is connected to the vehicle body ring σ. Vehicle height sensor 19 that detects a change in vehicle height based on the relative position change between the sprung upper portion and the unsprung portion such as a wheel.
．． 20 detection signals and an operating device 2 that can issue various operation commands.
1 command signal is input, -force control circuit 1
8 to G Power supply section 2a of motor 2, valve 6.7.16
It is configured to output a signal for controlling the operation of each of the solenoids 6b, 7b, and 16b.

As shown in FIG. 2, the compressor 1 is installed on the vehicle body 23 of a vehicle having front and rear wheels 22, for example, at the front of the vehicle body, as shown in FIG. For this purpose, a compressor 1 and a front wheel damper 8. ! 1, the compressor 1 and the rear wheel dampers 1o, i
The force of the air passage 13 connecting the i'' increases in length.

Therefore, when adjusting the vehicle height to increase the front and rear height of the vehicle, first, as shown in FIG.
As a result, the valve γ disposed in the air passage 12 is first opened with a slight delay, and then opened for a certain period of time to fully open the main valve 6 disposed in the air passage 13. When raising the vehicle height by the control circuit 18, the above-mentioned (
If the control is performed, high pressure air will be supplied to the dampers 10 and 11 on the rear wheel side first, and the pressure in the noodles 10 and 11 will be supplied to the damper 8 on the front wheel side for the preceding time t1. .9
However, the resistance of the air passage 13 is greater than that of the air passage 12 due to the difference in length, so they cancel each other out and finally the dampers 8 and 9 on the front wheel side and the damper on the rear wheel side <10
, 11 air pressure (i required θ) pressure J to equalize the front and rear heights of the vehicle.In addition, in order to generate such an action noise, the delay time t1 is determined by the difference in the length of the air passages 12 and 13. It will be determined as appropriate depending on the situation.

When the vehicle height adjustment is completed, the control circuit 18 sends a signal to the electric motor 2.7<) to rev 6 and 7.
At fi-71, motor 2 is stopped and valve 6,
7Q is forced to close, and as a result, one vehicle height adjustment device is closed.

According to the above embodiment, the compressor 1 is the vehicle (7) fi
? Although we have explained the case where the high-pressure air supply means is arranged on one side of the vehicle, it generally occurs when the high-pressure air supply means is arranged on one side of the vehicle. The present invention can be applied to a vehicle height adjustment device in which a difference occurs, and the same structure can be applied to a case where vehicle height is adjusted using other hydraulic pressure or the like.

As is clear from the above explanation, with the present invention, &i, in the vehicle height adjustment device, for example, the compressor 0) self E1 position is biased, so there are differences in the lengths of the air passages σ) to each Dan and S. Even if the length σ), the required air pressure can be supplied to each valve without being affected by the difference in length σ), and the vehicle height can be adjusted by equalizing the vehicle height by σ at the front and rear of the vehicle. be able to.

[Brief explanation of drawings]

The drawings fully show one embodiment of the present invention. Figure 1 is a circuit diagram showing the pneumatic circuit and its control circuit of the vehicle height adjustment device according to the present invention. Figure 2 is a circuit diagram showing the arrangement position of the compressor in the vehicle and the air pressure circuit. FIG. 3, which shows the relationship between the passages, is a time chart for explaining the operation. In the drawing, 1 is the compressor, 2 is the electric motor, 6 is the solenoid valve in the air passage on the front wheel side, 7 is the solenoid valve in the air passage on the rear wheel side, 8.9 is the front damper, and 1o and ii are the rear tire valves. , 16 is an exhaust lunoid valve, and 18 is a control circuit. Patent Applicant: Honda Motor Co., Ltd., Representative Patent Attorney, Part 2: 1) Co., Ltd.

Claims (1)

[Claims] II. Pump devices installed on one side of both front and rear wheels supply high-pressure body motion fluid to dampers installed in each suspension system that supports the front and rear wheels by fully valving each fluid passage. In the vehicle height adjustment device for a vehicle that increases height, among the solenoid valves for opening and closing the passages provided in the front wheel fluid passage and the rear wheel fluid passage, the solenoid valve for the fluid passage with a long passage is opened first. A control method for a vehicle height adjustment device, characterized in that the vehicle height is raised by fully opening a solenoid valve of a short fluid passage that is opened for a certain period of time.