VORRICHTUNG ZUR DIGITALEN STEUERUNG SELBSTTAETIGER SCHALTEINRICHTUNGEN FUER KRAFTFAHRZEUGE

摘要

To change the speed ratio of an automatically shiftable power train by which the torque of an engine is transmitted to the traction wheels of a vehicle, a logic circuit emits commands to respective solenoid valves in response to a combination of operating parameters such as vehicle speed, engine temperature, accelerator position and road gradient. Speed is measured by a pulse generator, coupled with the output shaft of the transmission, whose pulses are counted by an accumulator that is periodically reset by a timing circuit and whose count between resettings is fed to the logic circuit together with signals indicating the position of a manual speed selector. The remaining parameters are used to modify the rhythm of the timer or the operation of a decoder inserted between the accumulator and the logic circuit.