Method and system for engine control to provide driver reward of

Details Method and system for engine control to provide driver reward of Method and system for engine control to provide driver reward of

1998-03-30

2000-02-22

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Including means responsive to instantaneous change in engine...

123352, F02D 4100

Patent

active

060267844

ABSTRACT:
A method for comprehensive integrated control of an internal combustion engine, such as a compression-ignition engine or a natural gas spark-ignition engine, utilizes an electronic control module which includes an idle shutdown feature to limit the amount of time the engine is allowed to idle when the vehicle is stationary and the ambient air temperature is between calibratable limits. The system and method permit extended idle periods when the ambient air temperature is below a lower limit or above an upper limit to allow operation of the vehicle heating or cooling system, respectively. A selectable operator override permits engine idling for a calibratable period of time when requested by the operator, such as by momentarily depressing the accelerator pedal. The present invention also includes a system and method for estimating the ambient air temperature based on various other standard engine information, such as engine speed, cooling fan operation, engine oil temperature, and manifold air temperature or air inlet temperature. Ambient air temperature estimation is utilized when a direct sensor is not installed, not configured, or an error is detected. Furthermore, the present invention includes improved cooling fan control to anticipate temperature increases due to operation of a transmission retarder, and imposing a minimum torque requirement for cooling fan operation resulting from high coolant temperature.

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