JPH01273710A - Height adjusting device for automobile - Google Patents

Abstract

PURPOSE:To reduce a time for reaching a large car height position by providing a logic circuit which outputs a signal of operating a compressor immediately when a car height selector switch is switched from an ordinary car height side to a large car height side. CONSTITUTION:When a car height is selected from the ordinary car height to the large car height by a car height selector switch 6, its select signal is input to a control unit 5. The control unit 5 outputs from its provided logic circuit 51 a signal of driving a compressor 1, actuating it. Simultaneously, supply-discharge air control valves L3 to L6 of an air sealed part in each air suspension FL to RR and a valve L1 of an air tank 3 are respectively turned on. By this constitution, the air of predetermined pressure is supplied to the sealed part of each air suspension FL to RR immediately when the car height is selected. Accordingly, the time can be reduced after the car height is selected till it obtains the large car height.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a vehicle height adjustment device for an automobile.

Conventional technology As a wheel suspension system for automobiles, an air suspension that utilizes the volumetric elasticity of air sealed in an air sealed part is used.
A vehicle height sensor is installed in each of the air suspensions of the front, rear, left, and right wheels, and air is supplied into the air-filled portion of each air suspension or air is exhausted from the air-filled portion based on the up signal or down signal of the vehicle height sensor. The vehicle height sensor is configured to adjust the vehicle height and maintain the correct vehicle posture at all times, and the vehicle height sensor is replaced with a vehicle height sensor for low vehicle height that performs posture control within a low standard vehicle height range, and a high standard vehicle height sensor. Vehicle height sensor 2 for high vehicle heights that performs posture control within the vehicle height range
A vehicle height switch is provided to switch between the two vehicle height sensors, one for low vehicle height and one for high vehicle height. For example, when driving on a good road, the low vehicle height sensor is used to set the vehicle height to low The system improves driving stability by controlling the vehicle's attitude at the high vehicle height level, and when the road becomes rough, the vehicle height selector switch is switched to the vehicle height sensor for high vehicle height, and the vehicle's posture is controlled at a high vehicle height level to keep the vehicle grounded. A device that can prevent such accidents and improve running performance on rough roads has already been developed, and was published in Japanese Unexamined Patent Application Publication No. 58-1.
It is published as Publication No. 61609.

Problems to be Solved by the Invention In the conventional vehicle height adjustment device as described above, air is always stored at a predetermined pressure in an air tank by driving a compressor.For example, when the vehicle height sensor of the air suspension issues an up signal, Based on the signal, the control circuit issues an output to open the air supply control valve of the air suspension, the air supply control valve is opened, and the air in the air tank flows into the air enclosure of the air suspension. The vehicle height is raised, but if the vehicle height selector switch is set to the high vehicle height side and all air suspension air supply control valves are open, due to constraints such as air tank capacity and allowable air pressure. The time required for the vehicle height to reach the high vehicle height position is, for example, 15 seconds to 50 seconds.
Usually it is relatively long, such as seconds.

SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicle height adjustment device that can shorten the time required for the vehicle height to reach the high vehicle height position after switching the vehicle height selector switch to the high vehicle height side. be.

Means for Solving the Problems The present invention provides vehicle height sensors for the air suspensions of all front, rear, left and right wheels, and based on the air supply signal and exhaust signal of the vehicle height sensor, a compressor generates a predetermined amount of air stored in an air tank. A control device is provided that issues an output signal to raise the vehicle height by supplying pressurized air to each air suspension, or to lower the vehicle height by exhausting the air in each air suspension. In vehicles equipped with a vehicle height switch that changes the vehicle height,
The present invention is characterized in that a logic circuit is provided which generates a signal to operate the compressor immediately when the vehicle height selector switch is switched to the high vehicle height side in a normal vehicle height state.

Effect As described above, the time required for the vehicle height to reach the high vehicle height position after the vehicle height selector switch is switched to the high vehicle height side is maintained until the air pressure in the air tank drops below a predetermined value. Compared to conventional equipment that supplies air from the air to each air suspension, this can be significantly shortened.

Example The present invention will be explained below with reference to the accompanying drawings.

In Figure 1, l is a compressor, 2 is a dryer, and 3
is an air tank, and when the compressor 1 is driven, air is press-fitted and stored in the air tank 3 via the dryer 2 and the air tank valve L1, and air suspensions FL on the front, rear, left and right sides.

Vehicle height sensors A and B installed on FR, RL, and RR
, C, D, the air stored under pressure in the air tank 3 is transferred to each air suspension FL, F.
The vehicle height can be raised by supplying the air to the R, RL, and RR air filling sections, or the vehicle height can be lowered by opening the exhaust valve L2 and discharging the air sealed in the air filling sections to the outside. It is now possible to do so.

L3+La*Ls+Lb is each air suspension FL,
This is an air supply/exhaust control valve that controls air supply/exhaust to each of the FR, RL, and RR air sealing sections.

4 is a pressure switch, which operates a drive control solenoid L7 of the compressor 1 to drive the compressor 1 when the air pressure in the air tank 3 falls below a predetermined value;
The air pressure inside the air tank 3 is maintained at a predetermined value.

5 is a control device, and the control device 5 is based on the input of each signal (down signal or up signal) of the vehicle height sensors A, B, C, D, and controls each air supply and exhaust control valve L3 to L6 that adapts to the signal. The air suspension supply and exhaust control valve equipped with a vehicle height sensor that issues a down signal (for example, a down signal) and the exhaust valve L2 are opened to exhaust air from the near suspension vent and lower the vehicle height. , Air suspension supply and exhaust control valve and air tank valve L equipped with a vehicle height sensor that issued an up signal
1 opens and supplies air in the air tank 3 to the air suspension to raise the vehicle height, and also controls energization of the drive control solenoid L7 of the compressor l based on the signal from the pressure sensor 4. It is.

A signal from a vehicle height changeover switch 6 that changes the vehicle height from a normal vehicle height to a high vehicle height, and a vehicle speed signal from a vehicle speed sensor 7 are input to the ZARANIMATA control device 5. When driving, the vehicle height selector switch 6 is switched from normal to high, and the signal is used to control the vehicle height. 2715 issues a signal to supply air to each air suspension, raising the height of the vehicle and preventing accidents such as the vehicle body touching the ground when driving on rough roads. In response to the signal from the high sensor, the control device 5 issues a signal to discharge the air in the air-sealed portion of each air suspension to the outside, thereby lowering the height of the vehicle and improving high-speed running stability.

Note that 8 represents a power source, and 9 represents a power switch.

In the vehicle height adjusting device in which the vehicle height can be switched from the normal vehicle height to the high vehicle height using the vehicle height changeover switch 6 as described above, the present invention provides a vehicle height adjustment device in which the vehicle height changeover switch 6 is switched to the high vehicle height side. The control device 5 is provided with a logic circuit 51 that issues a signal to immediately operate the compressor 1 when the vehicle height is high, and the logic circuit 51 is configured to operate the compressor 1 immediately when the vehicle height selector switch 6 is switched to the high vehicle height side. It is something.

According to the present invention configured as described above, as shown in the flowchart of FIG. 2 and the time chart of FIG.
By switching the vehicle height selector switch 6 from the normal vehicle height (NORMAL) side to the high vehicle height (Hl) side, when the signal is input to the control device 5, each air suspension FL is changed according to the signal from the control device 5. ,
Supply/exhaust control valve L for each air sealing section of FR, RL, and RR
3. L4. L5. L6 and each air suspension FL of the air press-fitted and stored in the air tank 3,
F.R.

The air tank valve L+, which controls the supply of air to the air sealing parts of RL and RR, is opened, and the drive control solenoid L1 of the compressor 1 is activated to drive the compressor L, so that the compressor 1 directly connects each air suspension FL. .

The air pressure supplied to the air sealing parts of FR, RL, and RR is equal to the allowable air pressure of the air tank 3, and the vehicle height reaches the high vehicle height position after switching the vehicle height selector switch 6 to the high vehicle height side. Until the air pressure in the air tank 3 drops below a predetermined value, air is supplied only from the air tank 3 to each air suspension FL, FR, RL, R.
This can significantly shorten the time required for supplying air to the R air sealing section compared to the conventional device. For example, the time required for the conventional device, which is about 15 to 50 seconds, can be reduced by about 6 seconds.

Note that the air supply to the air sealing portions of each air suspension FL, FR, RL, and RR by the drive of the compressor 1 is stopped when any of the vehicle height sensors A, B, C, and D detects "high". At the same time, each air suspension FL,
FR, RL.

RR supply/exhaust control valve L3. L4. L5. Close L6 and air tank valve L1, and then open each air suspension FL and FR individually from the air tank 3 as necessary.
, RL, and RR move to general control in which air is supplied to the air sealing sections.

In the time chart showing the operation of the compressor 1 shown at the bottom of Fig. 3, the dotted line indicates the air tank 1.
This figure shows a conventional device in which the compressor 1 is activated by a signal from a pressure switch 4 which detects that the air pressure of the air pressure is below a predetermined value and issues a signal.In the device of the present invention, the operating time of the compressor 1 is reduced by L. As a result, each air suspension FL, FR.

By increasing the air pressure in the air sealed portions of the RL and RR, the time it takes for the vehicle height to reach the high vehicle height can be significantly shortened.

Effects of the Invention As described above, according to the present invention, in the east height adjustment device in which the vehicle height can be changed from the normal vehicle height to the high vehicle height by the vehicle height changeover switch 6, the above vehicle height is set in the normal vehicle height state. The control device 5 is provided with a logic circuit 51 that issues a signal to operate the compressor 1 immediately when the changeover switch 6 is switched to the high vehicle height side, and this logic circuit 51 switches the vehicle height changeover switch 6 to the high vehicle height side. By configuring the compressor l to operate immediately when the air tank 3
Air is supplied only from the air tank 3 to each air suspension FL, FR, and R until the air pressure in the air tank 3 drops below a predetermined value.
This device can be significantly shortened compared to the conventional device for supplying air to the L and RR air sealing sections, and together with the simple configuration, it can bring about great practical effects.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an air suspension air supply/exhaust control system showing an embodiment of the present invention, and FIGS. 2 and 3 are a flow chart and a time chart showing control aspects of the present invention, respectively. 1...Compressor, 3...Air tank, 4...
Pressure switch, 5...control device, 51
...Logic circuit, 6.Vehicle height selection switch, 7.
...Vehicle speed sensor, 8...Power source, 9...Power switch, A, B, C, D...Vehicle height sensor. that's all

Claims (1)

[Claims] A vehicle height sensor is installed on each of the air suspensions for the front, rear, left, and right wheels, and based on the air supply and exhaust signals from these vehicle height sensors, a compressor supplies air at a predetermined pressure stored in the air tank to each air suspension. The vehicle is equipped with a control device that issues an output signal to raise the vehicle height or lower the vehicle height by exhausting the air in each air suspension, and is also equipped with a vehicle height switch that changes the vehicle height from normal vehicle height to high vehicle height. A vehicle height adjustment device for a vehicle, characterized in that the vehicle is equipped with a logic circuit that issues a signal to immediately operate the compressor when the vehicle height selector switch is switched to the high vehicle height side in a normal vehicle height state. .