JPS6341209Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an electronically controlled suspension that has at least two reserve tanks for storing compressed air for a suspension equipped with an air spring, one for the front wheels and one for the rear wheels.

Electronically controlled suspensions that use air spring suspensions consume a very large amount of compressed air, so the reserve tank located behind the compressor has a very large capacity. Therefore, there is a drawback that the space occupied by the reserve tank becomes too large. In addition, in a suspension with an air spring for each wheel, when the suspension of each wheel is driven to supply and exhaust compressed air, since there is only one reserve tank, the suspension of each wheel Interference between the suspensions was likely to occur, causing deterioration in suspension performance.

This idea was made in view of the above points,
The purpose of this is to reduce the capacity of one reserve tank by providing at least two reserve tanks for storing compressed air, one for the front wheels and one for the rear wheels, in electronically controlled suspensions equipped with air springs. To provide an electronically controlled suspension that improves suspension performance by preventing interference between suspensions.

Hereinafter, an electronically controlled suspension according to an embodiment of the invention will be described with reference to the drawings. The figure shows the suspension unit _SRL for the left rear wheel in detail. In the figure, detailed illustrations of the suspension unit S _RR for the right rear wheel, the suspension unit S _FL for the left front wheel, and the suspension unit S _FR for the right front wheel are omitted. The suspension unit _SRL incorporates a strut-type damping force switching type shock absorber, and the suspension function is achieved by a coil spring 11, an air spring 12, and a shock absorber 13. The suspension of the shock absorber 13 is switched between hard and soft suspension by driving a stepping motor 141 for switching damping force. The amount of compressed air in the air spring chamber 17 of the air spring 12 is adjusted via an air passage 16 formed in the piston rod 15. Here, 18 is a vehicle height sensor that detects the vehicle height.

By the way, atmospheric air sent from an air cleaner (not shown) is compressed in a compressor 19, dried in a dryer 20, and stored in reserve tanks 211-214. Interposed between the reserve tank 211 and the air passage 16 leading to the air spring chamber 17 are an electropneumatic proportional valve 221 that changes the pressure of compressed air in accordance with an electrical signal, and an electromagnetic valve 231 that confines the compressed air. . Here, 212 is the reserve tank for the right rear wheel, 2
22 is an electropneumatic proportional valve, and 232 is a solenoid valve. Also, 213 is the reserve tank for the left front wheel, 22
3 is an electropneumatic proportional valve, and 233 is a solenoid valve. Furthermore, 214 is a reserve tank for the right front wheel, 22
4 is an electropneumatic proportional valve, and 234 is a solenoid valve. Also,
142 is a stepping motor for the right rear wheel, 14
3 is a stepping motor for the left front wheel, and 144 is a stepping motor for the right front wheel. Here, the compressed air exhausted from the electro-pneumatic proportional valves 221 and 222 flows into an exhaust pipe (not shown), and the compressed air exhausted from the electro-pneumatic proportional valves 223 and 224 flows into an air cleaner (not shown). be done.

Further, the handle 24 of the vehicle includes a handle 24.
A steering sensor 25 is provided to detect the rotation angle and rotation speed of the steering wheel. This steering sensor 25 is composed of an annular reflecting plate attached to the handle 24, a light emitting diode, and a phototransistor, and its detection signal is supplied to a spring constant and damping force switching computer 27. Further, the speedometer 26 has a built-in vehicle speed sensor 261 that detects the vehicle speed and supplies a detection signal to the computer 27.
Furthermore, 28 is a brake, and a brake sensor 29 for detecting the amount of depression of the brake 28 is provided. A detection signal output from the brake sensor 29 is supplied to the computer 27. Furthermore, 30 is an accelerator, and an accelerator sensor 3 detects the amount of depression of this accelerator 30.
1 is provided. A detection signal output from the accelerator sensor 31 is supplied to the computer 27. Further, a vehicle height signal output from the vehicle height sensor 18 is input to a computer 32 for vehicle height adjustment and internal pressure constant control. In addition, vehicle height sensors (not shown) for the suspension units S _RR , S _FL , and S _FR
A vehicle height signal is also input to the computer 32 from above. The computer 27 also operates the stepping motors 141 to 144 and the solenoid valves 231 to
234, respectively. Further, the computer 32 is connected to the electropneumatic proportional valves 221 to 224.
A control signal is output to.

Next, the operation of this device configured as described above will be explained. In the following operations, only the operations of the suspension unit _SRL for the left rear wheel will be described, but the operations of the other suspension units _SRR ,
The same can be said about the operations of S _FL and S _FR .
A vehicle height signal output from the vehicle height sensor 18 is input to the computer 32, and the computer 32 determines whether to adjust the vehicle height. A control signal proportional to the internal pressure of the air spring chamber 17 is output from the computer 32 to the electropneumatic proportional valve 221. This control signal causes the air spring chamber 17 to be supplied and exhausted. Then, when air is supplied, the vehicle height rises, and when air is exhausted, the vehicle height decreases. In this way, the internal pressure of the air spring chamber 17 is regulated by the control signal supplied to the electropneumatic proportional valve 221. Thereafter, the internal pressure in the air spring chamber 17 is kept constant by controlling the electropneumatic proportional valve 221. As explained in the configuration section, the compressed air discharged from the electropneumatic proportional valve 221 flows into the exhaust pipe.

Further, the rotation angle, rotation speed, vehicle speed, amount of brake depression, or accelerator opening of the steering wheel detected by the steering sensor 25, vehicle height sensor 261, brake sensor 29, or accelerator sensor 31 is input to the computer 27, and these values are input to the computer 27. When the value exceeds a certain value, the computer 27 performs processing to harden the suspension.
That is, the solenoid valve 231 is closed by the control signal output from the computer 27. Then, under the control of the computer 27, the stepping motor 141 is driven to drive the shock absorber 13.
The damping force is assumed to be hard. In other words, when the solenoid valve 231 is closed, the suspension becomes hard.

In the above embodiment, a reserve tank is provided for each suspension unit, but two reserve tanks may be provided, one for the front wheels and one for the rear wheels.

As detailed above, according to this invention, in an electronically controlled suspension equipped with an air spring, by providing at least two reserve tanks for storing compressed air, one for the front wheels and one for the rear wheels, one reserve tank can be created. It is possible to provide an electronically controlled suspension that improves the performance of the suspension by reducing the capacity of the suspension and preventing interference between the suspensions of each wheel.

[Brief explanation of the drawing]

The drawing shows an electronically controlled suspension according to an embodiment of the invention. 11...Coil spring, 12...Air spring, 13...Shock absorber, 211-21
4... Reserve tank, 221-224... Electro-pneumatic proportional valve, 231-234... Solenoid valve.

Claims (1)

[Scope of utility model registration request] It consists of a suspension equipped with an air spring, a reserve tank for storing compressed air, a control valve that controls supply and exhaust of compressed air to the air spring chamber of the air spring, and a controller that controls the control valve. An electronically controlled suspension comprising at least two reserve tanks, one for front wheels and one for rear wheels.