JPS59130718A - Starting method of car height adjuster - Google Patents

Abstract

PURPOSE:To reduce load on compressor, to start smoothly and to improve delivery performance of compressor by constructing such that a car height adjusting valve is opened by means of a pump system when increasing car height. CONSTITUTION:In order to increase car height, an open signal for exhaust valve 14 is fed for predetermined time to a valve solenoid 14b to open the valve 14 while high pressure operating fluid in delivery chamber is discharged to the atmosphere thus thus to lower the pressure. Then a compressor 1 is started simultaneously with closing of valve, to open car height adjusting valves 6, 7. With such arrangement, load to be applied on the compressor can be reduced resulting in smooth start.

Description

[Detailed Description of the Invention] Unexploded BA (f'i) is a vehicle height adjustment device for a vehicle such as a passenger car, in which the load immediately after the supply starts when supplying pressurized air is reduced for a certain period of time without lowering the vehicle height, and the compressor is activated. This invention relates to a starting method that allows smooth starting.

A vehicle height adjustment device is a device that changes and adjusts the vehicle height so that the vehicle height is always maintained at the standard height according to the increase or decrease of the load on the vehicle body. It is possible to make the riding comfort comfortable by maintaining the suspension capacity and adjusting the strength of the suspension capacity of the suspension system. The vehicle height adjustment device consists of a compressor that generates a working fluid such as compressed air, and a compressor that shortens and expands by supplying/extracting or discharging the working fluid, thereby changing the vehicle height. A damper installed in the wheel suspension system,
It consists of a fine exhaust port, each pulp, and an electric circuit that controls their operation. Conventionally, the compressor used in a vehicle height adjustment device generally has a discharge chamber that contains a high-pressure working fluid used for vehicle height adjustment in a sealed state. The compressor is normally driven by an electric motor, but when starting the compressor with the discharge chamber sealed with high-pressure working fluid as described above, a large load is placed on the electric motor. However, when the voltage of an on-vehicle battery decreases and the voltage applied to the motor decreases when an excessively large starting load current is required, the current that can be passed through the motor decreases, and a case may occur in which the compressor cannot be started.

Conventionally, in order to solve the above-mentioned problems, measures were taken to reduce the load on the electric motor when starting the compressor by lowering the volumetric efficiency of the compressor, but this method reduced the vehicle height adjustment time. This has caused problems such as the length of the vehicle height becoming longer and the vehicle height adjustment being unable to be completed when necessary.

The inventor of the present invention has developed the present invention in view of the above-mentioned problems related to starting the compressor in a vehicle height adjustment device, and to effectively solve the problems.

An object of the present invention is to reduce the load at the time of starting the compressor by discharging the high-pressure working fluid in the discharge chamber of the compressor without lowering the vehicle height when the compressor is started to raise the vehicle height in a vehicle height adjustment device. In addition to improving the volumetric efficiency of the compressor, it is possible to improve the discharge performance by increasing the volumetric efficiency of the compressor, or to use a compressor with a larger discharge capacity, thereby shortening the vehicle height adjustment time when necessary. An object of the present invention is to provide a method for starting a vehicle height adjustment device that allows rapid vehicle height adjustment in a vehicle.

In order to achieve the above object, the present invention is characterized in that the exhaust pulp provided in the vehicle height adjustment device is opened for a certain period of time before starting the compressor to reduce the exhaust gas. After discharging the high-pressure working fluid in the discharge chamber of the pulp pump, the electric motor is activated to start the compressor, and the circuit that supplies compressed air to the bumps and flats of each wheel at the same time as or slightly delayed from the start of the compressor is installed. 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. 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 renoid valves 6, 7 which are normally closed by springs 6a, 7a. The left and right front dampers 8, 9. ! , lyadanno! io,
i1 by an air passage.

The dryer 4 is for removing moisture from the air, and the pulp 6.7 is normally closed and allows compressed air to pass in either direction when the solenoids 6b and 7b are energized. This is a pulp for adjusting vehicle height that opens up as if it were a car. Dampers 8 to 11 are provided as suspension systems for the front wheels and rear wheels, respectively, to support and suspend the load of the vehicle body, and compressed air is stored inside the dampers 8 to 11 to shorten and shorten the load.
It has a diaphragm that can adjust the vehicle height by expanding. 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 arranged in parallel to the check valve 5 . This air passage 13 is a passage used during exhaustion.

Further, a branch part is provided on the discharge port side of the compressor 1, and an exhaust solenoid pulp 14, which is normally maintained in a closed state by a spring 14a, is interposed in the middle of the branch part, and an exhaust passage leading to the suction and discharge port is branched. It is provided.

Regarding the above, the passage from the compressor 1 to the exhaust pulp 14, the passage from the compressor 1 to the dryer 4, the passage from the dryer 4, and the passage from the dryer 4 to the vehicle height adjustment pulp 6.7 are the discharge of the compressor 1. This is what makes up the room. After adjusting the vehicle height to increase the vehicle height, the discharge chamber of the compressor 1 is in a high pressure state.

On the other hand, the electrical system is provided with a control circuit 15 configured by a computer or the like at its center, and this control circuit 15 includes a control circuit 15 that is disposed close to the front and rear suspension systems of the vehicle and that is connected to the sprung mass of the vehicle body, etc. Detection signals from vehicle height sensors 16 and 17 that detect changes in vehicle height based on changes in the relative position between the parts and unsprung parts such as wheels, and command signals from an operating device 18 that can issue various operation commands are input. At the same time, the force control circuit 15 is configured to output signals for controlling the operation of the power supply section 19 of the electric motor 2 and the solenoids 6b, 7b, and 14b of the pulp 6, 7, and 14.

In the above configuration, the pneumatic circuit of the vehicle height adjusting device according to the present invention operates as follows under the control of the control circuit 15.

First, in the case where a signal is sent to the control circuit 15 and the power supply unit 19 to operate the electric motor 2 and start the compressor 1 in order to raise the vehicle height, a signal is sent to open the exhaust valve 14 for a certain period of time before starting the compressor 1. the pulp 1
4 to the solenoid 14b to keep the pulp 14 open for a certain period of time (state B in FIG. 2). After the high-pressure working fluid in the discharge chamber is released to the atmosphere by opening the pulp 14 and the pressure is reduced, the pulp 14 is closed and at the same time the compressor 1 is started (state C in FIG. 2) and the vehicle height is lowered. Open the adjusting pulp 6.7 (state in the middle of Figure 2). By doing so, the pressure in the discharge chamber is extremely low, so the load on the compressor 1, that is, the electric motor 2, will be reduced. As shown in FIG. 3, when the pulp 14 is closed, the compressor 1 is first started, and after a certain period of time has elapsed, Gusiv 6. In this way, for example, when using a compressor with a large discharge chamber capacity, if the compressor is started and the loops 6 and 7 are opened at the same time, the The compressed air in the diaphragms 8 to 11 may flow back into the discharge chamber, causing the vehicle height to drop temporarily. On the other hand, since the pressure inside the discharge chamber is sufficiently reduced by the exhaust gas, the compressor 1 starts smoothly and quickly, and the discharge capacity of the compressor 1 is sufficiently increased at the time t t. By opening the pulp 6.7, the compressor 1 can be operated without applying an excessive load, and the vehicle height adjustment device can smoothly perform the vehicle height adjustment operation.

In the above embodiment, a vehicle height adjustment device constituted by a pneumatic circuit has been described, but it goes without saying that the present invention can be applied to a vehicle height adjustment device constituted by, for example, a hydraulic circuit.

As is clear from the above description, the present invention provides the following effects. When raising the vehicle height using a vehicle height adjustment device, a small, low-output electric motor can be used to smoothly start up a compressor, etc. in order to reduce the residual pressure in the discharge chamber. The vehicle height can be easily and inexpensively realized without making any functional changes, and the vehicle height can be adjusted quickly.The vehicle height adjustment time can be shortened and the optimal vehicle height can always be adjusted. In particular, when releasing the residual pressure in the discharge chamber to the atmosphere, it is possible to start the compressor smoothly and quickly without temporarily lowering the vehicle height, removing only unnecessary residual pressure in the air circuit. This makes it possible to maintain good ride comfort and adjust the height.

Furthermore, when the compressor is started, the electric motor receives one force f↓dl.
By reducing r, it is possible to drive a compressor with a larger discharge capacity; secondly, by reducing the starting load current of the motor, it is possible to improve the durability of the motor.

[Brief explanation of the drawing]

The drawings show a preferred embodiment of the present invention, and FIG. 1 is a circuit diagram of the pneumatic pressure control circuit of the vehicle height adjustment device according to the present invention, and FIG. 2 is a time chart for explaining the operation. Figure 3 is a time chart of the other operation descriptions. <ru)゛, 8-11 are Dannok, 14 is exhaust nozzle, 15 id: jl+l
l a 1 circuit 0

Claims (1)

[Claims] A pump device is operated by an electric motor to open a vehicle height adjustment valve to supply working fluid to the rear and rear of the vehicle to raise the vehicle height, and on the other hand, a pump for discharging the working fluid and the vehicle height adjustment valve are opened. In the vehicle height adjustment device which lowers the vehicle height by discharging working fluid to the outside, when adjusting the vehicle height to increase the vehicle height, the pump device is started and the vehicle height adjustment valve is opened. A method for starting a vehicle height adjustment device, characterized in that: