Electronic shift control

Claim 1

A control system for controlling an element engageable to establish a gear ratio in a gear set, a torque transmitting shaft in said gear set, a torque sensor associated with said shaft and adapted to provide a signal responsive to torque transmitted by said shaft, acceleration signal means producing a signal responsive to a desired acceleration rate, an electronic controller connected to said acceleration signal means and said torque sensor, said electronic controller including an amplifier stage having logic means responsive to the gear ratio established to provide a signal representative of the gear ratio established, transducer means responsive to vehicle weight and connected to provide a signal thereto representative of vehicle weight to said controller, a control mechanism for controlling engagement of said engageable element, means connecting said controller and control mechanism whereby establishment of said ratio is controlled by said controller in accordance with the torque value in said shaft and said desired acceleration rate, whereby said acceleration rate will not exceed the limit established by said acceleration signal means, wherein said controller includes a comparator connected to said acceleration signal means and said torque sensor, a pulse width modulating means connected to said comparator and said hydraulic valve, whereby said comparator supplies a signal to said pulse width modulating means which varies with torque of said shaft and said acceleration signal.