Interrelated power delivery controls – including engine control – Transmission control – Control by sensed ambient condition – pattern indicia,...
Patent
1997-03-03
1998-09-08
Bonck, Rodney H.
Interrelated power delivery controls, including engine control
Transmission control
Control by sensed ambient condition, pattern indicia,...
475117, F16H 5972
Patent
active
058038639
ABSTRACT:
A transmission warm-up control strategy is provided for an automatic transmission used in a machine that is started or operated in cold conditions. When the operating value of the oil in the transmission is below a predetermined level, as sensed by a temperature sensor or a viscosity sensor, a controller turns on an indicator lamp, de-energizes all of the solenoid to the solenoid actuated valves, and holds for a predetermined period of time. The respective solenoids are incrementally energized and held for a second period of time while continuously monitoring the operating condition of the oil in the transmission. Once the operating condition of the oil is above the predetermined operating value, the indicator lamp is turned off and the system is returned to normal operating conditions. If the shift lever is moved from the park position during warm-up, all solenoids are de-energized and the indicator lamp is set to flash. The condition is held for the first predetermined period of time then the solenoids for the neutral clutches are energized and if the shift lever is not in the neutral position, the controller require that the shift lever be returned to the neutral or park position.
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Hayward Randy R.
Winzeler James E.
Bonck Rodney H.
Burrows J. W.
Caterpillar Inc.
Estremsky Sherry Lynn
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