| 摘要 |
A system for actuating a normally engaged clutch of a manual transmission type vehicle in which clutch re-engagement is sequenced in a plurality of steps or stages. A source of a first pressure level is employed to operate a clutch servo, and a clutch re-engagement control chamber having a second pressure level therein is employed in the stepped clutch re-engagement cycle. A solenoid valve, when energized, connects the source of the first pressure level to the servo to operate the servo and disengage the clutch, and at this time isolates the re-engagement control chamber from the servo. Then upon de-energization of the solenoid valve the source of first pressure level is isolated from the servo and the control chamber is substantially simultaneously connected to the servo so as to allow partial release of the first pressure level from the servo and thereby effect a first stage of clutch re-engagement. The servo is vented to atmosphere by a throttle-controlled valve and preferably also by a bleed orifice to allow complete release of the first pressure level from the servo and thereby allow the clutch to become fully re-engaged, and preferably the added volume of the control chamber is also simultaneously bled to atmospheric pressure to make the final clutch re-engagement stage more controllable and less critical. Preferably, the solenoid valve is energized and de-energized by a throttle-controlled switch to make clutch actuation fully automatic. Alternatively the solenoid may be energized by a novel gearshift knob tilt switch forming a part of the present invention.
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