Hybrid Electric Vehicle Controller and Method of Controlling a Hybrid Electric Vehicle
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Abstract
Embodiments of the invention provide a controller for a hybrid electric vehicle (HEV) having an engine and an electric machine, the controller being configured upon start-up to control an electric machine to provide torque to drive a vehicle with an engine off if a state of charge (SoC) of an energy storage device is above an EV-start SoC threshold and to start an engine if a SoC of an energy storage device is below the EV-start SoC threshold, wherein the EV-start SoC threshold is determined to be one selected from amongst a value sufficient to allow a vehicle to travel a prescribed distance before a SoC falls below a SoC minimum level at which an engine is started and a value sufficient to allow a vehicle to operate for a prescribed time period before a SoC falls below the SoC minimum level.
5 Citations
33 Claims
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1-16. -16. (canceled)
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17. A controller for a hybrid electric vehicle (HEV) having an engine and an electric machine and an energy storage device, the controller being configured to start the engine if a state of charge (SOC) of the energy storage device is below a SoC minimum level (SoCmin),
the controller being further configured, upon initial start-up of the vehicle in which the vehicle is corm-oiled to transition from, a not ready state to a ready state, to determine whether the SoC of the energy storage device is below an EV-start SoC threshold (SoCEV-start) instead of SoCmin; -
if the SoC of the energy storage device is below an EV-start SoC threshold the vehicle is controlled to start the engine, and if the SoC of the energy storage device is not below an EV-start SoC threshold the vehicle is controlled to start in EV mode, wherein SoC EV-start is greater than SoCmin and. comprises at least one of; a value sufficient to allow the vehicle to travel a prescribed distance before the SoC falls below SoCmin; and a value sufficient to allow the vehicle to operate for a prescribed time period before the SoC falls below SoCmin. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A method of controlling a hybrid electric vehicle having an engine and an electric machine, the method comprising:
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upon initial start-up of the vehicle in which the vehicle is controlled to transition from a not ready state to a ready state, determining whether a SoC of an energy storage device of the vehicle is below an EV-start SoC threshold (SoCEV-start) instead of a SoC minimum level (SoCmin); if the SoC of the energy storage device is below the EV-start SoC threshold, controlling the vehicle to start the engine, and if the SoC of the energy storage device is not below the EV-start SoC threshold, controlling the vehicle to start in EN mode, wherein SoC EV-start is greater than SoCmin and comprises at least one of; a value sufficient to allow the vehicle to travel a prescribed distance before the SoC falls below SoCmin; and a value sufficient to allow the vehicle to operate for a prescribed time period before the SoC falls below SoCmin. - View Dependent Claims (29, 30, 31, 32, 33)
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Specification