US 4,300,652 AGranted

Soft shift reversing control system

AssigneeClark Equipment Company

InventorsGilbert E. Redzinski, Donald N. Pinne, Jr., Joseph R. Den Bleyker

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Abstract

An electronic reversing control system is disclosed for preventing excessive shock loading of the vehicle driveline when the operator calls for vehicle reversal with the vehicle in motion. A digital logic forward-reverse control channel links the operator's direction control lever and the reversing means in the transmission. When reversing is called for the control channel logic is inhibited by a speed responsive signal unless the vehicle speed is below a predetermined value. A speed retarding control channel controls the vehicle brakes and throttle when a reversing signal is produced provided the speed is above the predetermined value. Additionally, the system is provided with a logic power loss detector which resonds to power supply failure and automatically shifts the transmission into neutral.

Claims15

Dependent claims

For use in a vehicle of the type having an engine coupled with traction wheels through a driveline including a change-speed transmission, said transmission including drive direction reversing means and direction selector means having a forward and reverse position, a drive reversing control system comprising a direction signal generator responsive to the position of said selector means for producing a direction command signal, first actuating means adapted to be connected with said reversing means and being responsive to the direction command signal, first gate means having a data input coupled with said direction signal generator, an output coupled with said first actuating means and having a clock input adapted to receive an inhibit signal, said first gate means being a storage gate means which produces on its output the state of the direction command signal applied to its data input in the absence of an inhibit signal on its clock input and which memorizes on its output the state of the direction command signal on its data input at the time an inhibit signal is applied to its clock input, a speed signal generator adapted to be connected with said driveline for producing a speed signal corresponding to the speed of the vehicle, inhibit signal means coupled with said speed signal generator for producing an inhibit signal only when said speed is above a predetermined value, said inhibit signal means being coupled with the clock input of the first gate means, whereby actuation of said reversing means is prevented when the vehicle speed is above said predetermined value.

For use in a vehicle of the type having an engine coupled with traction wheels through a driveline including a change-speed transmission, said transmission including drive direction reversing means and direction selector means having a forward and reverse position, a drive reversing control system comprising a direction signal generator responsive to the position of said selector means for producing a direction command signal, first actuating means adapted to be connected with said reversing means and being responsive to the direction command signal, first gate means having a data input coupled with said direction signal generator, an output coupled with said first actuating means and having a clock input, a speed signal generator adapted to be connected with said driveline for producing a speed signal corresponding to the speed of the vehicle, inhibit signal means coupled with said speed signal generator for producing an inhibit signal only when said speed is above a predetermined value, said inhibit signal being coupled with the clock input of the first gate means, and adapted to inhibit a change in the output of the gate means to prevent actuation of said reversing means when the vehicle speed is above said predetermined value, speed retarding means, said reversing control system including a reversing signal generator coupled with said direction signal generator for producing a reversing command signal when said direction selector means is moved between foward and reverse positions, second actuating means adapted to be connected with said vehicle speed retarding means, second gate means, said reversing signal generator being coupled through said second gate means with said second actuating means.

Dependencies are inferred from the claim text.