| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve the traveling characteristic and control characteristic of a vehicle by changing pressure of a consumption unit, which is formed in a consumption unit side, as a function of controlled variable between at least two stages. SOLUTION: Consumption unit pressure as a function of the control pressure is set at multi stages so as to improve the fine control ability in a characteristic line range having a low slope, because range of the control pressure Ps at a given consumption unit pressure Pv is large. Furthermore, range of the control pressure can be reduced within a high slope range. Consequently, control pressure, which can be typically utilized for consumption unit to be typically used, can be optimized without disregarding a safety function to be secured by all of the high consumprion pressure. Since a control valve 4 is formed into the multi-stage structure and a characteristic line of a range of low controlled variable is gradually raised, pressure can be more finely adjusted so as to reduce the hysteresis.</p> |
