APPARATUS AND METHOD FOR CONTROLLING ENGINE STOP OF HYBRID ELECTRIC VEHICLE
First Claim
1. An apparatus for controlling an engine stop of a hybrid vehicle, the apparatus comprising:
- an engine that provides output to the hybrid vehicle;
a hybrid starter generator configured to absorb engine torque;
a battery connected to the hybrid starter generator; and
a control unit for controlling whether the engine is driven, and the torque generation of the hybrid starter generator,wherein the control unit executes a negative torque command of the hybrid starter generator to stop the engine by absorbing the engine torque, and the control unit sets a profile so that a magnitude of an instantaneous charging energy becomes maximum in view of a hybrid starter generator efficiency and an efficiency of the battery depending on an engine RPM, and provides the torque of the hybrid starter generator depending on the profile.
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Abstract
An apparatus and method for controlling an engine stop of a hybrid electric vehicle provides an efficient torque in the operation of a hybrid starter generator, by applying a torque of a high efficiency point of the hybrid starter generator according to a drop of engine RPM when the engine is stopped, so as to improve fuel efficiency of a vehicle and damping vibration of the vehicle when the engine is stopped, by generating a negative torque on the hybrid starter generator side in accordance with the drop of the engine RPM when the engine is stopped, and by applying a torque of the point that gives the maximum charging power of the battery through the generated negative torque.
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Citations
8 Claims
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1. An apparatus for controlling an engine stop of a hybrid vehicle, the apparatus comprising:
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an engine that provides output to the hybrid vehicle; a hybrid starter generator configured to absorb engine torque; a battery connected to the hybrid starter generator; and a control unit for controlling whether the engine is driven, and the torque generation of the hybrid starter generator, wherein the control unit executes a negative torque command of the hybrid starter generator to stop the engine by absorbing the engine torque, and the control unit sets a profile so that a magnitude of an instantaneous charging energy becomes maximum in view of a hybrid starter generator efficiency and an efficiency of the battery depending on an engine RPM, and provides the torque of the hybrid starter generator depending on the profile. - View Dependent Claims (2, 3, 4)
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5. A method for controlling an engine stop of a hybrid vehicle, the method comprising the steps of:
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determining whether an engine power drive shaft is disconnected and a fuel injection of the engine is stopped when an engine of the hybrid vehicle is stopped; generating a negative torque in the hybrid starter generator, depending on a profile that is set so that a magnitude of an instantaneous charging energy of the battery becomes maximum, in view of a hybrid starter generator efficiency and a battery efficiency depending on an engine RPM when the engine power drive shaft is disconnected and the fuel injection of the engine is stopped; and determining whether the engine RPM is less than a preset reference value by the generated torque of the hybrid starter generator. - View Dependent Claims (6, 7, 8)
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Specification