| 摘要 |
PURPOSE:To prevent the waste of air in an air pressure tank, by operating a level control valve with a control device which inputs an average car level on the basis of a signal out of a level sensor and a signal out of a level setter, in case of a vehicle fitted with an air spring type suspension. CONSTITUTION:During car stoppage, whether an engine is driven or not is discriminated by a discriminator 30 setting a signal of an engine speed sensor 24 as an input whereby the signal of a level sensor 15 is controlled. That is to say, during engine driving, when a signal variation in the sensor 15 is below the set value on the basis of an unsensitive value setter 31 and an unsensitive time setter 32, this disparity is ignored and an average car level is found at every specified time by an operation circuit 35 instead. During engine stoppage, on the basis of an unsensitive value setter 33 and an unsensitive time setter 34, a level variation being larger than that in time of engine revolution is inorged and the average car level at every longer time is found by the circuit 35 instead. And, on the basis of a signal commensurate to the average car level and a signal of a level setter 22, each of level control valves C of front and rear wheels is operated by a control device 36. |
