| 摘要 |
1537408 Change-speed gear control NISSAN MOTOR CO Ltd 24 Dec 1976 [27 Dec 1975] 54118/76 Heading F2D In a control system for an automatic changespeed gear in a vehicle full depression of the accelerator pedal to open the engine throttle operates a kiekdown switch which energizes a solenoid 28 to move a valve spool 52 and supply pressure fluid from a passage 44 to a downshift circuit 48 and so raise the vehicle speeds at which downshift will occur, deenergization of the solenoid allowing the valve spool 52 to return to the position shown when pressure is supplied to a chamber 36 from passage 44 through a valve 30, this only happening when the spool 80 of valve 30 is moved by a spring 86 against throttle-variable pressure supplied from a line 74. The pressure supply to the downshift circuit is thus only discontinued when the throttle has been closed to a predetermined extent, to reduce the pressure in line 74 sufficiently. |
