JPS59130719A - Load reducing method for car height adjuster - Google Patents

Abstract

PURPOSE:In a car height adjuster for passenger car, to reduce load on the system by opening an operating fluid discharging valve for predetermined time when operating the pump system. CONSTITUTION:Upon supply of car height rising signal from car height sensors 20, 21, a control circuit 19 will provide operating commands to power source section 23 and each solenoid 6a, 7a in solenoid valves 6, 7 to function them. Consequently a compressor 1 will function to feed compressed air through open solenoid valves 6, 7 to dampers 8-11. During said operation, the control circuit 19 will open an exhaust solenoid valve 18 temporarily to discharge the residual pressure in the dampers 8-11. Consequently the load on the compressor 1 is reduced resulting in smooth start.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a load reduction method for reducing the load for a certain period of time immediately after the supply of pressurized air or the like is started in a vehicle height adjustment device for a vehicle such as a passenger car.

The vehicle height adjustment device adjusts the height according to the increase or decrease of the load on the vehicle body.
C This is a device that changes and adjusts the vehicle height so that the vehicle height is always maintained at the standard height.This device maintains the vehicle height at an appropriate height relative to the road surface, and also controls the strength and weakness of the suspension system. It is possible to adjust the riding comfort to make it more comfortable. Figure 2 shows an example of the configuration of a system for raising and lowering the vehicle height of a conventional vehicle height adjustment device, for example, a system for supplying or exhausting compressed air, and an electrical system for controlling these operations. The problem to be solved by the present invention will be clarified.

When the electric motor 100 operates to operate the compressor 101, air is sucked in and compressed through the intake/discharge port 102, and the compressed air is passed through the passage 103 to the dryer 104 and the check valve 105.
and is stored in tank 106. The above compressor 10
Solenoid valve 107 that is normally closed in the operating state of 1.
, 108° 109 is opened, the compressed air is further transferred to the left and right front dampers 110, 111 and the left and right rear bumpers 41.
12 and 113, which increases the vehicle height. This operation is an adjustment operation when the load on the vehicle body increases, and the lowering of the vehicle height is detected by the front and rear vehicle height sensors 114, 115, and based on this detection signal, a control circuit 116 consisting of a computer or the like is activated. electric motor 100
Power supply section 117° Solenoid valve 107, 108, 1
Each of the above operations is performed by sending an operation signal to 09.

The time required for activation is a certain amount of time required to raise the lowered vehicle height to the standard height.

On the other hand, if the load decreases again after raising the vehicle height that has decreased due to an increase in load, each of the front and rear dampers
10, 111, 112, and 113 maintain a high pressure state, so the vehicle height increases further than the reference height. Therefore, in such a case, the vehicle height sensor 114, 115 detects the state of the vehicle body rising, and based on this detection signal, the normally closed solenoid valves 108, 109 and the normally closed exhaust solenoid pulp 118 are activated to open. A signal is sent from the control circuit 116 to the solenoid valve 108.
.
02 to the outside.

In this way, the vehicle height is lowered, and when the vehicle height reaches the reference height, each of the above operations is stopped and the vehicle height is adjusted.

According to the above structure and operation, when the compressor 101 is activated to supply compressed air in order to raise the vehicle height that has fallen below the standard height, the vehicle height is generally maintained in the air passages 110 to 113 and the air passages. This means that a certain amount of residual pressure exists in the compressor 9, and this residual pressure is applied to the compressor 101 as a large load. Therefore, in order to start the compressor 101 against this load and send compressed air to the motors 110 to 113 as described above, the electric motor 100 that operates the compressor 101 must be large-sized and have a large output capacity. The requirement to increase the size of electric motors carried in vehicles such as passenger cars is a major problem in terms of installation space, weight, etc.

When compressed air is supplied as described above, the conc.
Regarding the problem of the above-mentioned load applied to the compressor, conventional measures have been taken to reduce the load, for example, by opening the intake valve of the compressor. It has to be changed, and the change work is troublesome and expensive.

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 use a vehicle height adjustment device, for example, when compressed air is supplied by a compressor to raise the vehicle height to a standard height, the residual pressure existing in the pneumatic circuit is removed for a certain period of time so that the compressed air is applied to the compressor immediately after the start of supply. reduce the load,
This makes it possible to start the compressor smoothly and easily even with a small electric motor with a small output capacity, and without making any changes to the compressor itself, simply changing the operation of the components of the conventional pneumatic circuit. It is an object of the present invention to provide a method for reducing the load on a vehicle height adjusting device, which is intended to be realized by a simple method of adding a load.

The present invention is characterized in that, in order to achieve the above object, the exhaust solenoid pulp provided in the pneumatic circuit of a conventional vehicle height adjustment device is opened for a certain period of time when the compressor is started, thereby completely eliminating the residual pressure in the pneumatic circuit. 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 adjustment device according to the present invention and an electrical system that controls the operation of each component of this pneumatic circuit. In FIG. 1, 1 is a compressor. It is caused to operate by actuation. The suction port of the compressor 1 communicates with the suction/discharge port 3 leading to the outside, and the discharge port of the compressor 1 connects to the left and right front dampers J? 8.9 and the rear damper 10.11 by an air passage. The dryer 4 is only for removing moisture from the air, and the solenoid valve 6.7 is normally closed and the solenoid valve 6a is closed.
, 7a are in an open state so that air can be supplied in any direction when the dampers 8 to 11 are energized, and are provided at the front and rear suspension parts of the vehicle, respectively, to support and support the load of the vehicle body. The dampers 8 to 11 have portions that store compressed air and can adjust the vehicle height. The compressed air supplied by the compressor 1 increases, and the higher the pressure, the higher the vehicle height.Besides, between the front damper 8゜9 and the rear damper elo, 11, there is a tank 12゜13 and air flowing from the rear to the front. A check valve 14 that allows the flow of
are provided, thereby optimizing the pressure in each damper.

A bypass air passage 16 having a check valve 15 facing in the opposite direction to the check valve 5 is arranged in parallel to the check valve 5 . This air passage 16 is a passage used during exhaustion.

A branch point A is provided on the discharge port side of the compressor 1, one branch is provided with a drain 17 for releasing air pressure when it is too high, and the other branch is provided with a drain 17 on the way. An exhaust solenoid valve 18, which is normally maintained in a closed state, is interposed therebetween, and communicates with the intake/exhaust port 3.

On the other hand, regarding the electrical system, a control circuit 19 consisting of a computer and other components is installed at the center of the electrical system. Detection signals from vehicle height sensors 20 and 21 that detect changes in vehicle height due to relative movement of the lower portion and command signals from an operating device 22 that can issue various operation commands are input, and a control circuit 19 sends signals to the electric motor 2. Power supply section 23, each solenoid 6a, 7a of solenoid valve 6.7.18.

It is configured to output a signal that controls the operation of 18a.

In the above configuration, the pneumatic circuit according to the present invention operates as follows. When the vehicle height becomes lower than the reference height, the control circuit 19 sends operation command signals to the power supply section 23 and the solenoids 6a and 7a of the solenoid valves 6.7, respectively, in response to the detection signals from the vehicle height sensors 20 and 21, causing them to operate. . When the electric motor 2 is activated by applying a stain flow from the power supply section 23, the compressor 1 is activated and compressed air is supplied to the dampers 8 to 11 via the solenoid valves 6 and 7 which are in an open state, thereby lowering the vehicle height. be enhanced.

When the vehicle height reaches the reference height, the control circuit 19 activates the solenoid valve 6.7 based on the signal from the vehicle height sensor 20.21.
and a signal for stopping the operation of the compressor 1, respectively, and the vehicle height adjustment operation is stopped.

Next, if the vehicle height rises beyond the standard height after adjusting to raise the vehicle height and it becomes necessary to lower the vehicle height, the control circuit 19 similarly receives signals from the vehicle height sensors 20 and 21. Solenoid valve 6.7° 18 solenoid 6a, 7
a, sends a signal to operate 18a. As a result, the solenoid valve 6.7.18 is opened, compressed air is exhausted through the passage 16 and the intake/exhaust port 3, and the vehicle height is lowered due to the crack, and when it reaches the standard height, the vehicle height sensor 2
The p solenoid valve 6 is activated by the function of the 0.2L sub-control path 19.
．． 7.18 is closed and vehicle height adjustment is stopped.

In the above, in the present invention, when the compressor 1 is activated to raise the vehicle height, the exhaust solenoid valve is opened for a certain period of time (for example, about 1 second) under the control of the control circuit 19.

In this way, when residual pressure exists in the pneumatic circuit of the dampers 8 to 11, etc., this residual pressure can be summed up and released to the outside via the valve 15 and the solenoid valve 18. The load applied to the compressor 1 immediately after starting up can be extremely reduced, and the compressor 1 can start up smoothly.

The time during which the exhaust solenoid valve 18 is kept open is determined by the rotational operation of the compressor 1, that is, by the electric motor 20.
This is until the rotating operation continues and a constant high torque state is reached. After the solenoid valve 18 closes, compressed air is supplied to each damper by the compressor 1. According to the above configuration, even if the electric motor 2 is small and its output is small, the operation can be smoothly performed. It becomes possible to start the compressor 1.

Figure 3 (13) shows the electric motor according to the present invention (Figure 3 (13)
This is a conceptual comparison of the relationship between torque (horizontal axis T) and supply current (vertical axis) for a)) and a conventional electric motor (Fig. 3 [F])). As described above, with the electric motor according to the present invention, the compressor 1 can be started using current with a small amount of electricity.

B in FIG. 1 represents the direction in which air flows (in the case of intake and exhaust). Furthermore, although the present embodiment has been described with respect to a pneumatic circuit, the present invention can of course be applied to a vehicle height adjustment device using a hydraulic circuit.As is clear from the above explanation, the present invention has the following effects. play. Small size, when raising the vehicle height higher than the standard height using a vehicle height adjustment device.
A compressor or the like can be started smoothly even with a low-output electric motor, and this can be realized easily and inexpensively without making any structural or functional changes to the compressor or the like itself. Further, since the electric motor can be small, it is convenient for use in a vehicle in terms of weight, power consumption, etc.

Modification work is extremely easy as it is sufficient to simply make changes to the electrical control.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a circuit diagram showing a pneumatic circuit and its control circuit of a vehicle height adjustment device according to the present invention, and FIG. 2 is a circuit diagram showing a conventional problem. A diagram similar to Figure 1, Figure 3 shows the current in the present invention and the conventional electric motor,
It is a graph diagram showing torque characteristics. In the drawings, 1 is a compressor, 2 is an electric motor, 3 is an intake/exhaust port, 6, 7.18 are lunoid valves, 8 to 11 are dampers, 19 is a control circuit, and 20.21 is a vehicle height sensor. Patent Applicant Honda Motor Co., Ltd. Agent Patent Attorney 2 1) Production Department Patent Attorney Ohashibe Production Volume Patent Attorney Yu Koyama

Claims (1)

[Claims] A vehicle height adjustment system in which an electric motor operates a pump device to supply working fluid to the front and rear of the vehicle to raise the vehicle height, and also opens a working fluid discharge valve to discharge the working fluid and lower the vehicle height. 1. A method for reducing load on a vehicle height adjusting device, characterized in that the operating fluid discharge valve is opened for a certain period of time when the pump device is operated.