| 摘要 |
PURPOSE:To facilitate the detection of an reduction in pressure of an air supply source where at least a part of suspension springs is composed of air springs by providing a warning when the condition that height is out of a standard value has continued for more than a predetermined time. CONSTITUTION:The rear front wheel 15 and the rear rear wheel 19 of a truck are suspended from a frame 13 by means of leaf springs 16 and 20 and air springs 17 and 21. And respective air springs 17 and 21 are communicated with each other, and are connected with an automatic suction valve 27 and an auto matic exhaust valve 28. And height is controlled by a step of controlling respec tive valves 27 and 28 by a computer 40 based on the output from a height detecting sensor 56 and the like. In this case, a present height is compared with a standard clearance in order to judge whether or not a discrepant condi tion that the present height is out of the standard one has continued for more than a predetermined time. And it if is judged to be 'YES', both an operation lamp 44 and a warning lamp 57 turn on and off for having the abnormality of the height sensor 56 known. |
