Optimal engine operating power management strategy for a hybrid electric vehicle powertrain
First Claim
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1. An engine power management method for a hybrid vehicle having an engine, a generator, an electric motor, and a traction battery, the engine coupled through a planetary gearset to the generator, the electric motor, and vehicle wheels, the method comprising:
- receiving a vehicle speed signal and a total power command associated with a current driver demanded power;
calculating power losses for the engine, the generator, the electric motor, the traction battery, and the planetary gearset using the vehicle speed and the total power command;
combining the power losses to obtain a total powertrain loss;
determining a target engine speed based on the total powertrain loss in response to the total power command;
adjusting engine torque to a value corresponding to the target engine speed; and
controlling rate of increase of the engine speed until the target engine speed corresponding to a changed total power command is attained.
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Abstract
A method for managing power in a hybrid electric vehicle powertrain having multiple components including at least two of a group comprising an engine, a motor, a generator and a high voltage battery includes computing power losses for the individual components. An engine operating speed and torque for a given vehicle speed and total power command is determined so that total power losses for powertrain components are minimized.
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1 Claim
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1. An engine power management method for a hybrid vehicle having an engine, a generator, an electric motor, and a traction battery, the engine coupled through a planetary gearset to the generator, the electric motor, and vehicle wheels, the method comprising:
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receiving a vehicle speed signal and a total power command associated with a current driver demanded power; calculating power losses for the engine, the generator, the electric motor, the traction battery, and the planetary gearset using the vehicle speed and the total power command; combining the power losses to obtain a total powertrain loss; determining a target engine speed based on the total powertrain loss in response to the total power command; adjusting engine torque to a value corresponding to the target engine speed; and controlling rate of increase of the engine speed until the target engine speed corresponding to a changed total power command is attained.
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Specification