JPH0331671Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a pressure data input section of a vehicle height adjustment device.

A vehicle height adjustment device for a motorcycle adjusts the vehicle height by adjusting the pressure in the gas chamber in the front fork and rear suspension. The gas chamber and the pressure system devices that supply and discharge pressurized air to and from the gas chamber are subject to certain pressure restrictions. Therefore, pressure state data is required to operate pressure system devices. The pressure data is also displayed on the display device, and is important information for the driver to manually adjust the vehicle height. Therefore, in the control system, it is necessary to detect the pressure state using a pressure sensor and take in this as control information. However, since the pressure data fluctuates unstably depending on the driving conditions, problems occur in that the pressure display is difficult to distinguish and there is a discrepancy between the pressure display and the actual pressure value. Such a problem can be solved by averaging the pressure data or by providing a low-pass filter. However, if such a measure is used, the response becomes poor when adjusting the vehicle height when the vehicle is stopped or traveling at low speeds, making it impossible to make fine adjustments.

The present inventor has devised the present invention in view of the above-mentioned problems and to effectively solve the problems.

The purpose of the present invention is to change the input form of pressure data from a pressure sensor depending on the driving condition of the vehicle, and to stabilize and accurately display pressure when pressure data fluctuates or becomes inaccurate. In addition, the vehicle height is intended to be adjusted with good responsiveness and fine adjustment when the vehicle is stopped.

In order to achieve the above object, the present invention transmits a pressure signal to the control means of a vehicle height adjustment device only for the first few seconds when manual operation is set for vehicle height adjustment without passing through a low-pass filter. The gist is that a switch for direct input is provided.

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

The drawing shows a system diagram of the vehicle height adjustment device according to the present invention. This vehicle height adjustment device is for motorcycles, and adjusts the vehicle height using air pressure.

First, the pneumatic circuit system will be explained. 1 is an air intake port, and an air filter 2 is disposed therein. The compressor 3 compresses the air sucked by the pump 4 and sends it to the dryer 5. The compressor 3 is activated when raising the vehicle height. The dryer 5 has the function of dehumidifying compressed air. A valve unit 6 has an internal air passage communicating with the dryer 5, and includes a front fork solenoid valve 7, a rear-action solenoid valve 8, an atmosphere release solenoid valve 9, and a pressure sensor 10. valve 7
When the valve 8 opens, the air passage inside the unit 6 communicates with the gas chamber inside the front fork 11, 11, and when the valve 8 opens, the air passage inside the unit 6 communicates with the gas chamber inside the front forks 11, 11.
It communicates with the gas chamber in 12 via a three-way socket 13. Further, when the valve 9 is opened, the air passage inside the unit 6 and the atmosphere are communicated through the exhaust port 14. The pressure sensor 10 detects the pressure in the air passage inside the unit 6, and the pressure is detected by the potentiometer 1.
0a etc. to convert it into an analog electrical signal and output it.

Next, the electric circuit system will be explained. 15 is a control unit. The control unit 15 includes a CPU 16 for adjusting the vehicle height. In order to operate the control unit 15, electricity from an on-vehicle battery 17 is adjusted to a predetermined voltage by a regulator 18 and then supplied. Further, the compilers 19 and 20 monitor the required voltage. An ignition switch 21 and a kill switch 22 are connected in series between the regulator 18 and the battery 17. The input side of the control unit 15 includes an automatic adjustment switch 23a, a manual switch 23b, and other switches 23 for instruction and detection, and a light emitting element 24a and a light receiving element 24b for detecting the vehicle height level.
Signals from the pressure sensor 10 and a vehicle height sensor 24 consisting of a light shielding plate 24c and a light shielding plate 24c are input. Signals from the switches 23 and the vehicle height sensor 24 are input to the CPU 16 via an input interface 25. The analog electrical signal from the pressure sensor 10 is inputted via the switch 26 to the low-pass filter 27 or directly to the A/D converter 28, and then inputted to the CPU 16 as a digital signal. On the output side of the control unit 15, the pump 4 described above,
A front fork solenoid valve 7, a rear action solenoid valve 8, an atmosphere release solenoid valve 9, and a pressure display device 29 are provided. The pump 4 and the valves 7, 8, and 9 are configured to receive driving signals via an output interface 30 and a driving circuit 31. The pump 4 is configured so that an excitation current flows through a drive coil 32a of a relay switch 32 disposed between the pump 4 and a power source. Note that this relay switch 32 is an emergency switch 3.
3 are installed in parallel. The above pump 4, valve 7,
The operations 8 and 9 are performed at appropriate timings based on control signals in accordance with vehicle height conditions, pressure conditions, and the like. The pressure display device 29 is disposed, for example, at a location that is easily visible to the driver. LCD29a inside
and a display CPU 29b.
A display output device 34 is interposed between the CPU 16 and the CPU 16 . Other necessary circuit elements are built into the control unit 15.

In the above, when the compressor 3 is operated and either the valves 7 or 8 are opened, compressed air is supplied to either the front fork 11 or the rear suspension 12, and the vehicle height increases. Also valves 7 and 8
If either one of them is opened and the valve 9 for venting to the atmosphere is opened, the compressed air in the front fork 11 and the rear suspension 12 will be released, and the vehicle height will be lowered. Such vehicle height adjustment is performed within a certain pressure range under pressure restrictions based on pressure information from the pressure sensor 10, and based on vehicle height information from the vehicle height sensor 24 and operation signals from each operation switch. This can be done manually or automatically based on the criteria.

In particular, in the present invention, the low pass filter 27
A switch 26 is provided at the front stage of the switch 26, and this switch 26
It is controlled by the CPU 16 as follows. That is, when attempting to adjust the vehicle height up or down by operating the manual switch 23b, an analog electrical signal related to pressure is directly sent to the A/D converter 28 for about 1.5 seconds from the time the manual switch 23b is turned on.
After that, the signal is input to the A/D converter 28 through a low-pass filter 27 (time constant of about 1 second). Also, when automatically adjusting the vehicle height,
After the valve starts operating, it passes through the filter 27.
After 1.5 seconds, the signal is input to the A/D converter 28. By processing the input pressure data from the pressure sensor as described above, when adjusting the vehicle height when the vehicle is stopped, etc., the sensitivity can be improved by directly taking in the pressure data without going through the filter 27. Vehicle height can be adjusted well and quickly, and fine adjustments can be made. On the other hand, after a predetermined period of time has elapsed, the pressure data is passed through the filter 27, thereby slowing down the degree of change in the pressure data taken into the CPU 16, and eliminating fluctuations in the display on the display device 29.

As is clear from the above explanation, according to the present invention,
When detecting the pressure state of each gas chamber with a pressure sensor and inputting it to the control means, a switch is provided at the input section so that it can be inputted directly without passing through a filter or inputted through a filter at the appropriate time. Therefore, when adjusting the vehicle height when the vehicle is stopped, etc., the vehicle height can be adjusted in a state where fine adjustments can be made with good responsiveness without using a filter, and normally the vehicle does not respond immediately to changes in pressure status through a filter. This allows for stable and accurate pressure display.

[Brief explanation of drawings]

The drawing is a system diagram of a vehicle height adjustment device according to the present invention. In the drawing, 3 is a compressor, 6 is a valve unit, 10 is a pressure sensor, 11 is a front fork, 12 is a rear action, 15 is a control unit, 16 is a CPU, 23 is a switch, 24 is a vehicle height sensor, and 26 is a changeover. , 27 is a low-pass filter, and 19 is a display device.

Claims (1)

[Claims for Utility Model Registration] (1) A pressure sensor detects the pressure in a gas chamber formed inside a suspension system interposed between a vehicle body and an axle, and this pressure signal is passed through a low-pass filter. The vehicle height is adjusted to a predetermined height by controlling the pressure of the gas chamber by inputting it to the control means through the control means, and displaying the pressure input to the control means on a display device, and controlling the vehicle height. In a vehicle height adjustment device equipped with a manual vehicle height adjustment function for arbitrarily adjusting the vehicle height, the control means controls the pressure without passing through a low-pass filter only for the first few seconds when the manual operation for vehicle height adjustment is set. A vehicle height adjustment device characterized by comprising a switch for directly inputting a signal to a control means. (2) The vehicle height adjustment device according to claim 1, wherein the low-pass filter has a time constant of several seconds.