| 摘要 |
Under idle condition of a vehicle, control valve 90 is "left half position", line pressure modulated by throttle valve 41 is applied to clutch hydraulic servo C1 through ports delta , mu ; and the clutch is held just under connection, line pressure is applied to brake hydraulic servo B1 through shift valve 52 being under low speed condition; in case of high speed running, shift valve 52 is "left half position", so that line pressure is not applied to brake hydraulic servo B1; when a vehicle starting, control valve 90 becomes "right half position", then, line pressure is applied to clutch hydraulic servo C1 through ports alpha , mu and port beta is drained; in case of high speed coasting, control valve becomes "left half position", line presure is not applied to clutch hydraulic servo C1; in case of speed higher than certain level, if a manual valve being shifted to R range, control valve 90 becomes "left half position" and ports epsilon , eta are disconnected; due to the above, creeping is avoided, hill-hold mechanism works, shift shock when clutch is connected is eliminated, engine braking under high speed coasting is avoided, and shifting to R range when running forward is avoided.
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