| 摘要 |
In an automotive vehicle having an engine connected to a gear-type transmission via a torque converter and a 1x converter-bridging clutch, an electronic circuit for automatically shifting the transmission and operating the clutch comprises a comparison-pulse generator emitting pulses having durations varying in accordance with engaged gear ratio and engine-loading conditions, these pulses being fed to the data inputs of a pair of D-type flip-flops for a time comparison with clock-input signals from a multiplexer/counter having periods proportional to the rotation rate of a converter turbine during a first processing phase of a time-division operating cycle and to the rotation rate of a transmission output shaft during a second processing phase. The flip-flops generate upshifting and downshifting signals for updating the contents of a converter-clutch store during the first phase and of a gear-state store during the second phase, the gear-state store being connected via an output circuit to gear-shift actuators in the transmission. The control device includes a read-only memory (VP) responsive to a gear-state signal from the gear-state store and to drive-program signals from a program selector for preventing the updating of the gear-state store by an upshifting signal when the engaged gear state is the maximum for the selected drive program. The device has another read-only memory (ZP) responsive to gear-state signals and a gear-change signal from a detector/comparator (GK) for modifying the moduli of counters (UZ, RZ, VWZ, OWZ) controlling the durations of respective gear-change operations. |
