Altitude compensation for target engine speed in hybrid electric vehicle
AssigneeFord Global Technologies, LLC
InventorCarol Louise Okubo
Life of this patent
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Abstract
A method for controlling a hybrid electric vehicle includes selecting a first target engine speed in response to a driver power request, calculating an available engine torque at the first target engine speed, adjusting the target engine speed if the available engine torque is insufficient to satisfy the driver power request, and commanding an engine to run at the target engine speed. The first target engine speed is optimized for fuel economy. The calculated available engine torque is less than a calculated maximum engine torque at the target engine speed, such that a torque reserve is maintained for engine vacuum.
Claims17
A method for controlling a hybrid electric vehicle comprising:
- in response to a reduced engine torque availability, commanding an engine to run at a target engine speed that exceeds an engine speed based on desired fuel efficiency, where a calculated maximum engine torque at the target engine speed exceeds a torque required to satisfy a driver power request at the target engine speed.
A hybrid electric vehicle comprising:
- an engine;
- and
- a controller programmed to set a first target engine speed in response to a driver power request and increase the target engine speed if a calculated available torque at the first target engine speed is insufficient to satisfy the driver power request.
A method for controlling a hybrid electric vehicle comprising:
- controlling engine speed in response to a difference between a driver power request and an available engine power, wherein the available engine power equals the product of a target engine speed and an available engine torque that is less than a calculated maximum engine torque at the target engine speed.
Dependencies are inferred from the claim text.