Hybrid electric vehicle control strategy to achieve maximum wide open throttle acceleration performance
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United States of America Patent
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Apr 22, 2003
Grant Date -
N/A
app pub date -
Oct 19, 2001
filing date -
Oct 19, 2001
priority date (Note) -
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Abstract
The invention is a controller for a hybrid electric vehicle (HEV) to meet driver expectation when forward wide open throttle (WOT) acceleration is requested while optimizing the total powertrain system efficiency and performance, especially when the engine is not even running. The controller can consider accelerator position, PRNDL position, and vehicle speed and start the engine if an estimated sum torque of a traction motor and generator motor is less than the calculated sum torque output of the traction motor and the engine at any given speed. Other control variables can include battery condition such as operating capacity, temperature, and state of charge. A constant can be added to allow a prestart of the engine to assure it is available when needed to maintain vehicle WOT acceleration requests.
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