04414863 is referenced by 84 patents and cites 18 patents.

A controller including a microprocessor for automatically shifting a transmission and selectively locking and unlocking a torque converter connecting the engine with the transmission. The controller has both manual and automatic modes of operation. In the automatic mode, one of three different shift patterns is automatically selected depending on the condition of a transport/loading mode switch and a throttle position switch. Transmission output speed is monitored and downshifts are prevented when the output is accelerating. Solenoid valves which are selectively activated to shift the transmission are monitored for open- or short-circuits. When a faulty solenoid is detected, the controller prevents shifting to a gear ratio which utilizes that solenoid and a display flashes diagnostic information including the gear ratios still available. The solenoids are pulsed at one of two duty cycles depending on the voltage level of the power supply.

Title
Automatic electronic control for a power shift transmission
Application Number
122404
Publication Number
4414863
Application Date
September 15, 1982
Publication Date
November 15, 1983
Inventor
Dean L Heino
Cedar Falls
IA, US
Assignee
Deere & Company
IL, US
IPC
B60K 41/18
F16H 3/74
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