JPH0641272B2 - Height adjustment device for motorcycles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a vehicle height adjusting device for a motorcycle, and more specifically, after the vehicle height is loosely adjusted and it is confirmed that the vehicle has started to run steadily. The present invention relates to a vehicle height adjustment device for a motorcycle, which is finely adjusted to control the vehicle height to be an optimum vehicle height.

(Prior Art) For motorcycles using an air suspension, various vehicle height adjusting devices have been proposed in which air is released when the vehicle is stopped to lower the vehicle height, and when traveling, air is injected to raise the vehicle height.

For example, in Japanese Examined Patent Publication No. 59-32356 “Vehicle height adjustment device”, when the traveling speed rises above a specified value, the pressure of the air enclosed in the air suspension rises, and when it falls below the specified value, it is enclosed in the air suspension. There is disclosed a device that lowers the pressure of the generated air and automatically adjusts the vehicle height according to the traveling speed.

(Problems to be solved by the invention) However, in the vehicle height adjusting device as described above, if the vehicle height is controlled so as to be uniformly set at a certain speed, the vehicle body sinks during acceleration / deceleration or cornering. If the vehicle height is adjusted when the vehicle is crowded, there is a problem that the vehicle height will change when the vehicle enters steady running, and the vehicle height will not be optimal.

An object of the present invention is to provide a vehicle height adjusting device for a motorcycle, which is capable of controlling the vehicle height to an optimum vehicle height value by temporarily adjusting the vehicle height, confirming that the vehicle has started to run normally, and then performing fine adjustment. Especially.

(Means for Solving Problems) In order to achieve the above-mentioned object, a vehicle height adjusting device for a motorcycle according to the present invention opens a suction valve during traveling and injects air from a pressure source into an air suspension to increase the vehicle height. Raise
In a vehicle height adjusting device for a motorcycle, which opens an exhaust valve to stop the air suspension to lower the vehicle height when stopped, a vehicle speed sensor for detecting a traveling speed of the motorcycle, and a vehicle height by displacement of the air suspension. A vehicle height sensor for detecting, a cornering sensor for detecting that the motorcycle is cornering, and the intake valve is opened when the output of the vehicle speed sensor reaches a set vehicle speed for increasing the vehicle height. After a certain time has passed or when the vehicle height sensor reaches a preset sparse adjustment vehicle height value, the intake valve is closed to perform the sparse adjustment of the vehicle height, and the output change of the vehicle speed sensor becomes within a certain range and When the cornering sensor is not outputting, the intake valve is opened, and when the preset optimum vehicle height value is reached, the intake valve And a vehicle height control circuit for controlling to perform a fine adjustment of the vehicle height to close the drive.

(Examples) Hereinafter, the present invention will be described in detail with reference to the drawings and the like.

FIG. 1 is a block diagram showing an embodiment of a vehicle height adjusting device for a motorcycle according to the present invention, and FIG. 2 is a view showing an air suspension used in the same embodiment device.

In FIG. 1, 11 is a compressor, 12 is a check valve, 13 is a relief valve, 14 is an accumulator, 15 is a pressure switch, and 16 is a relief valve.

Compressed air from the compressor 11 is the check valve 1
It is connected to the accumulator 14 via 2. The accumulator 14 is a container for storing air under pressure, the pressure inside the container is detected by the pressure switch 15, and the controller 4 controls the compressor 11 based on the output of the pressure switch 15. There is.

21 is a vehicle speed sensor, 22 is a vehicle height sensor, 23 is a pressure sensor, 24 is a cornering sensor, 31 is an intake valve, 3
2 is an exhaust valve, 4 is a controller, and 5 is an air suspension.

The vehicle speed sensor 21 is a sensor that detects the traveling speed of the motorcycle. The vehicle height sensor 22 is a sensor that detects the seat height of the vehicle body, that is, the vehicle height, and detects the displacement of the air suspension 5 here. Pressure sensor 23
Is a sensor that detects the pressure of the air supplied to the air suspension 4. The cornering sensor 24 is a sensor that detects that the vehicle body is cornering,
A gyro is used here. Each of these sensors 2
The outputs of 1 to 24 are connected to the controller 4.

The intake valve 31 is a valve for injecting the compressed air from the accumulator 14 into the air suspension 5, and the intake valve 32 is a valve for exhausting the compressed air of the air suspension 5. The intake valve 31 and the exhaust valve 32 are opened / closed by a control signal from the controller 4.

In FIG. 2, 50 is a rear suspension, 51 is a swing arm, 52 is a push rod, 53 is a bracket, and 54 is a bell crank.

In this embodiment, the controlled air suspension 5 is only the rear suspension 50. This is because if the front fork also controls the air, the entire device becomes complicated and the cost increases, and the friction of the oil seal increases in the case of air filling, which may reduce the riding comfort and traveling stability. Because there is.

Next, the operation of the vehicle height adjusting device for a motorcycle according to the present invention will be described.

FIG. 3 is a waveform diagram for explaining the operation of the embodiment of the vehicle height adjusting device for a motorcycle according to the present invention.

At t _0, the motorcycle is stopped and the vehicle body is
Suspended only with suspension springs. When the rider gets on and other loads are loaded and the vehicle is in a running state,
The controller 4 raises the vehicle height by opening the intake valve 31 until the output of the vehicle height sensor 22 reaches the traveling vehicle height L.

When the vehicle starts at t ₁ , the controller 4 detects from the output of the vehicle speed sensor 21 that the vehicle is accelerating. t ₂
At the point of time, when the output of the vehicle speed sensor 21 reaches the set speed V _up for increasing the vehicle height, T ₁ hour has elapsed from that point (FIG. 3 (a)), or the output of the vehicle height sensor 22 is The intake valve 31 is closed when the sparse adjustment vehicle height value H ₁ is reached (FIG. 3 (b)), whichever is earlier.

At time t ₃ , when the change in the output of the vehicle speed sensor 21 is within a certain range and the cornering sensor 24 is not outputting, the controller 4 determines that the vehicle has started steady running. When the controller 4 determines that the vehicle has started to run steadily, it opens the intake valve 31 to set the optimum vehicle height value H.
Control to be ₂ . The coarse adjustment is performed at the set speed V _up
When I went after T ₁ hour has passed,
Since the vehicle height at that time is not necessarily the sparse adjustment vehicle height value H ₁ , the average value of the strokes for the time T ₂ after the steady running is calculated, and the optimum vehicle height value H ₂ is calculated based on that value.
Control to become.

In the present embodiment, the coarse adjustment vehicle height value H ₁ is set to a value that is about 80% of the optimum vehicle height value H ₂ . Further, since this fine adjustment is performed during steady traveling, it is sufficient to perform this fine adjustment only once during traveling. G is an element that determines whether or not the vehicle is running normally.
Considering the unevenness of the road surface detected by a sensor,
More accurate vehicle height adjustment is possible.

(Effects of the Invention) As described in detail above, according to the present invention, when the vehicle speed reaches the set vehicle speed for increasing the vehicle height, the vehicle height is temporarily increased to the sparse adjustment vehicle height value, and the vehicle height is increased at the time of steady running. Since fine adjustment is performed, it is possible to avoid the adjustment due to the sinking of the vehicle body at the time of acceleration and cornering, and to adjust the vehicle height to the optimum one.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a vehicle height adjusting device for a motorcycle according to the present invention, and FIG. 2 is a view showing an air suspension used in the same device. is there. FIG. 3 is a waveform diagram for explaining the operation of the embodiment of the vehicle height adjusting device for a motorcycle according to the present invention. 11 ... Compressor, 12 ... Check valve 13 ... Relief valve, 14 ... Accumulator 15 ... Pressure switch, 16 ... Relief valve 21 ... Vehicle speed sensor, 22 ... Vehicle height sensor 23 ... Pressure sensor 24 ... … Cornering sensor 31 …… Intake valve, 32 …… Exhaust valve 4 …… Controller 5 …… Air suspension 50 …… Rear suspension 51 …… Swing arm 52 …… Push rod 53 …… Bracket 54 …… Bell crank

Claims (1)

[Claims] 1. A motorcycle for lowering the vehicle height by opening the intake valve to inject air from a pressure source into the air suspension to increase the vehicle height when the vehicle is running, and opening the exhaust valve to bleed air from the air suspension when the vehicle is stopped. In the vehicle height adjusting device, the vehicle speed sensor that detects the traveling speed of the motorcycle, the vehicle height sensor that detects the vehicle height based on the displacement of the air suspension, and the fact that the motorcycle is cornering are detected. When the output of the cornering sensor and the vehicle speed sensor reaches a set vehicle speed for increasing the vehicle height, the intake valve is opened, and after a certain time has elapsed from that time or the vehicle height sensor reaches a preset sparse adjusted vehicle height value. In that case, the intake valve is closed to sparsely adjust the vehicle height so that the output change of the vehicle speed sensor is within a certain range and the cornering is performed. A vehicle height control circuit that opens the intake valve when the sensor is not outputting and closes the intake valve when a preset optimum vehicle height value is reached to perform fine adjustment of the vehicle height. A height adjusting device for a motorcycle characterized by the above.