JPH0340108U - - Google Patents

Description

[Brief explanation of drawings]

The drawings show one embodiment of this invention, and FIG. 1 is a pneumatic circuit diagram showing a control device for a rear two-axle type air suspension, and FIG. 2 is a schematic side view of a rear two-axle type automobile. . DESCRIPTION OF SYMBOLS 1...First air spring, 2...Second air spring, 6...Compressed air source, 7...Connecting pipe line,
8... Branch pipe, 9... Leveling valve, 10
... Bypass pipe line, 11 ... First electromagnetic directional control valve, 12 ... Second electromagnetic directional control valve, 15 ... Current supply circuit, 21 ... Electronic controller, 22, 24 ...
Wheel sensor, 28...second relay switch (cutoff switch), 29...pressure switch.

Claims (1)

[Scope of claims for utility model registration] (1) A first rear axle driven by an engine;
a second rear axle that is disposed near the first rear axle and rotates freely; a first air spring that is provided between the first rear axle and the vehicle body to support the vehicle body; and a second rear axle and the vehicle body. and a second air spring that supports the vehicle body and is provided between the compressed air source and the first air spring. a connecting pipe connecting between the two, a branch pipe branching from a part of the connecting pipe between the compressed air source and the first air spring and connecting to the second air spring, and a connecting pipe a leveling valve that is inserted into the vehicle body and operated in response to changes in vehicle height to control the air pressure in the first and second air springs to maintain the vehicle height at a constant level; and the connecting pipe. a bypass conduit extending from a portion between the leveling valve and the first air spring in the passage;
a rest position in which the bypass line is closed and a connection between the compressed air source and the leveling valve; and an active position in which the bypass line is connected to the compressed air source and the connection between the compressed air source and the leveling valve is cut off. a first electromagnetic directional control valve having a first electromagnetic directional control valve, a rest position inserted in the branch pipe, and opening the branch pipe while cutting off the connection between the second air spring and the atmosphere side; a second electromagnetic directional control valve having an operating position that disconnects the spring from the compressed air source and connects the second air spring to the atmosphere; A plurality of wheel sensors detect the rotational speed of each wheel and output a sensor signal, and the sensor signals from these wheel sensors are received and processed, and the wheels on the first rear axle are compared to the wheels on the front axle. A rear dual shaft comprising: an electronic controller that outputs a drive signal to switch both the first and second electromagnetic directional control valves to the operating position only when it is determined that the rotational speed has increased beyond a predetermined value. Type air suspension control device. (2) When a drive signal is output from the electronic controller, the solenoids of the first and second electromagnetic directional control valves are energized to switch the first and second electromagnetic directional control valves from the rest position to the operating position. a pressure switch that outputs a detection signal when the air pressure in the first air spring reaches a predetermined limit pressure; 2. The control device for a rear twin-shaft air suspension according to claim 1, further comprising a cutoff switch for cutting off the energized circuit.