JPS61291284A - Regulator for height of car of motorcycle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a vehicle height adjustment device for a motorcycle, and more specifically, a vehicle height adjustment device for a motorcycle that lowers the vehicle height in two stages during deceleration. Regarding.

(Prior Art) Various vehicle height adjustment devices have been proposed for motorcycles using air suspension, which lower the vehicle height by removing air when the vehicle is stopped, and raise the vehicle height by injecting air when the vehicle is running.

For example, in the Japanese Patent Publication No. 59-32356 ``Vehicle Height Adjustment Device for Motorcycles'', when the running speed increases above a specified value, the pressure of the air sealed in the air suspension is increased, and when the speed falls below the specified value, the pressure of the air sealed in the air suspension is increased. A device has been disclosed that automatically adjusts the vehicle height according to the traveling speed by lowering the pressure of the air flowing into the vehicle.

(Problem to be solved by the invention) However, with the above-mentioned vehicle height adjustment device, when the traveling speed drops below a specified value, the pressure of the air sealed in the air suspension is reduced to lower the vehicle height to the stopping level. If the engine speed suddenly decreases to
There was a problem in that the amount of vertical movement of the vehicle height increased, resulting in poor running stability.

An object of the present invention is to provide a motorcycle capable of improving running stability by controlling the operation of lowering the vehicle height from a running level to a stopped level in two stages when the vehicle speed decelerates to below a set vehicle speed. The purpose of the present invention is to provide a vehicle height adjustment device.

(Means for Solving the Problems) In order to achieve the above object, the vehicle height adjustment device for a motorcycle according to the present invention opens the intake valve and injects air from a pressure source into the air suspension to adjust the vehicle height when the vehicle is traveling. Raise the
A vehicle height adjustment device for a motorcycle that lowers the vehicle height by opening an exhaust valve to remove air from the air suspension when the motorcycle is stopped, and a vehicle speed sensor that detects the traveling speed of the motorcycle.

If it is determined that the vehicle is decelerating based on the outputs of the vehicle height sensor that detects the vehicle height based on the displacement of the air suspension and the vehicle speed sensor, the vehicle height sensor detects the vehicle height when the output of the vehicle speed sensor reaches the set vehicle speed to lower the vehicle height. Opening an exhaust valve, closing the exhaust valve when the output of the vehicle height sensor reaches a set vehicle height that is slightly higher than a stopped vehicle height, and opening the exhaust valve when it is determined that the vehicle has stopped based on the output of the vehicle speed sensor; and a vehicle height control circuit that controls the exhaust valve to close when the output of the vehicle height sensor reaches the vehicle stop height.

(Example) 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 adjustment device for a motorcycle according to the present invention, and FIG. 2 is a diagram showing an air suspension used in the device according to the embodiment.

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.

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

21 is a vehicle speed sensor, 22 is a vehicle height sensor, 23 is a pressure sensor, 31 is an intake valve, 32 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 a motorcycle. The vehicle height sensor 22 is a sensor that detects the seat height of the vehicle body, so-called vehicle height, and here detects the displacement of the air suspension 5. The pressure sensor 23 is a sensor that detects the pressure of air supplied to the air suspension 4. The outputs of these sensors 21 to 23 are connected to the controller 4.

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

In Figure 2, 50 is the rear suspension.

51 is the swing arm, 52 is the bush rod.

53 is a bracket and 54 is a bell crank.

In this embodiment, the air suspension 5 that is controlled is only the rear suspension 50. This is because if the front fork also controls air, the entire device becomes complicated and costs increase, and if air is filled, the friction of the oil seal increases, which may reduce ride comfort and running stability. Because there is.

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

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

At the time of to, the motorcycle is running steadily (Fig. 3 (al)), and the vehicle height is maintained at the running level (Fig. 3 (al)).
Figure (b)).

Now, deceleration starts at time tl, and when the vehicle speed sensor 21 detects that the vehicle speed has reached the set vehicle speed V down for lowering the vehicle height (FIG. 3(al)), the controller 4 opens the exhaust valve 32 and starts decelerating at t2. After T time has elapsed from this point, or when it is detected from the output of the vehicle height sensor 22 that the vehicle height has reached the set level L2, which is slightly higher than the stop level,
The controller 4 closes the exhaust valve 32 (Fig. 3(b)
) at time t3).

Note that when the vehicle is accelerated again to a predetermined speed before stopping, the vehicle height will rise from this set level L2.

At time t4, when the vehicle speed sensor 21 detects that the motorcycle has stopped, the controller 4 opens the exhaust valve 32 again, and when the output of the vehicle height sensor 22 reaches the stop level L1, the controller 4 opens the exhaust valve 32 again. Close (Figure 3 (
b)). Note that in this embodiment, the setting level L2 is
It is set at a position approximately 40% of the running level and the stop level L1.

(Effects of the Invention) As explained in detail above, according to the present invention, when the vehicle speed decreases to below the set vehicle speed to lower the vehicle speed or vehicle height, the operation of lowering the vehicle height from the driving level to the stopping level is performed in two stages. By controlling the vehicle height, driving stability can be improved without extreme changes in vehicle height.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a vehicle height adjustment device for a motorcycle according to the present invention, and FIG. 2 is a diagram showing an air suspension used in the device according to the embodiment. FIG. 3 is a waveform chart for explaining the operation of the embodiment of the vehicle height adjustment 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 31...Intake valve 32...Exhaust valve 4.
... Controller 5 ... Air suspension 50 ... Rear suspension 51 ... Swing arm 52 ... Bush rod 53 ... Bracket 54 ... Bell crank patent applicant Suzuki Motor Co., Ltd. agent Patent attorney I Noro Jusai 2

Claims (1)

[Claims] A vehicle height adjustment device for a motorcycle that opens an intake valve when driving and injects air from a pressure source into the air suspension to raise the vehicle height, and when stopped, opens an exhaust valve to remove air from the air suspension and lower the vehicle height. A vehicle speed sensor detects the running speed of the motorcycle, a vehicle height sensor detects the vehicle height based on the displacement of the air suspension, and if it is determined that the vehicle is decelerating based on the outputs of the vehicle speed sensor, the vehicle speed is detected. When the output of the sensor reaches a set vehicle speed to lower the vehicle height, the exhaust valve is opened, and when the output of the vehicle height sensor reaches the set vehicle height, which is slightly higher than the stopped vehicle height, the exhaust valve is closed, and the vehicle speed sensor and a vehicle height control circuit that opens the exhaust valve when it is determined that the vehicle has stopped based on the output of the vehicle height sensor, and closes the exhaust valve when the output of the vehicle height sensor reaches the vehicle stop height. Vehicle height adjustment device for motorcycles.