Interrelated power delivery controls – including engine control – Transmission control – Engine controlled by transmission
Patent
1998-03-02
2000-04-04
Ta, Khoi Q.
Interrelated power delivery controls, including engine control
Transmission control
Engine controlled by transmission
477 97, 477110, 123 4113, F01P 702
Patent
active
060454822
ABSTRACT:
A system for controlling air flow to an engine cooling system includes a control computer responsive to a number of engine and/or engine accessory operating conditions, and to various engine operational states to control operation of an engine cooling device. The engine operational states are each a function of at least engine fueling commands and include a "free energy" state corresponding to zero fueling, an "absorbing additional torque" state corresponding to zero fueling and activation of either service brakes or engine brakes, and a "needs additional torque" state corresponding to a rapid positive change in fueling, recent gear shifting to the lower gears of the transmission with fueling above a predefined level or a high rate of change in fueling rate. All other engine operational states are defined as a don't care state. The control computer is operable to control the engine cooling device as a function of the number of engine and/or engine accessory operating conditions and a current engine operating state, wherein examples of the engine and/or engine accessory operating conditions include engine coolant temperature, rate of change of engine coolant temperature, intake manifold air temperature and air conditioner refrigerant pressure. The engine cooling device is preferably a single speed, dual speed or variable speed engine cooling fan.
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DDEC III/IV Application and Installation Manual, pp. 14-1-14-13 (Oct. 1998) .
Dollmeyer Thomas A.
Nishar Dipchand V.
Cummins Engine Company, Inc.
Ta Khoi Q.
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