Control method of hybrid vehicle
AssigneesHyundai Motor Company, Kia Motors Corporation
InventorsSang Joon Kim, Seong Ik Park
Life of this patent
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Abstract
A control method of a hybrid vehicle that includes engages a second clutch and in response outputs a torque through an output shaft that is connected to the second carrier via torque supplied from an engine and a first and second motor-generators. Accordingly, the speed of the engine is controlled via the first motor-generator, and a torque of an output shaft is control via the second motor-generator. Accordingly, the second motor-generator is used to control an operating point of the engine so that a base motor torque is effectively set.
Claims4
A control method of a hybrid vehicle that includes a first planetary gear set having a first sun gear, a first planetary gear, a first ring gear, and a first carrier, a second planetary gear set having a second sun gear, a second planetary gear, a second ring gear, and a second carrier, an engine connected to the first carrier via a first output shaft, a first motor-generator configured to rotate the first ring gear, a second motor-generator connected to the second sun gear to rotate the second sun gear and the first sun gear, a first brake configured to brake the first ring gear, a second brake configured to brake the second ring gear, a first clutch selectively connecting the first ring gear with the first carrier, and a second clutch selectively connecting the first carrier with the second ring gear, the method comprising:
- controlling, by a control unit installed in the vehicle, the second clutch to be engaged;
- outputting torque through a second output shaft that is connected to the second carrier, the torque supplied from the engine and the first and second motor-generators;
- controlling, by the control unit installed in the vehicle, the speed of the engine by using the first motor-generator;
- and
- controlling, by the control unit installed in the vehicle, the torque of the second output shaft by using the second motor-generator wherein a rotation speed of the first motor-generator is controlled so that the engine reaches a predetermined target speed, and
- wherein the predetermined target speed of the engine is calculated by Formula 2 below:
- ω
- MG
-
-
- 1
- =
- 1
- +
- R
- 1
- +
- R
- 2
- R
- 1
-
- ω
- ENG
- -
- 1
- +
- R
- 2
- R
- 1
-
- ω
- out
- ,
- Formula
-
-
- 2
- wherein R1 corresponds to a gear ratio of a ring gear of a first planetary gear set, R2 corresponds to a gear ratio of a ring gear of a second planetary gear set, ωout corresponds to an output velocity of the second carrier gear and ωENG corresponds to an output velocity of the engine.
Dependencies are inferred from the claim text.