Hybrid vehicle and method of controlling mode transition thereof
AssigneesHyundai Motor Company, Kia Motors Corporation
InventorYoung Jun Lee
Life of this patent
Estimating the term…
Abstract
A method of performing a mode transition in a hybrid vehicle includes: determining a transition from a first mode to a second mode; comparing a driver's required torque with a maximum torque of an electric motor, determining a compensation torque when the driver's required torque is greater than the maximum torque; and determining a first torque to be output from an engine and a second torque to be output from a hybrid starter generator, which is connected to the engine, in consideration of the compensation torque and a system efficiency.
Claims20
A method of performing a mode transition in a hybrid vehicle, the method comprising steps of:
- determining, by a hybrid control unit (HCU), a transition from a first mode to a second mode;
- comparing, by the HCU, a required torque with a maximum torque of an electric motor;
- determining, by the HCU, a compensation torque when the required torque is greater than the maximum torque;
- and
- determining, by the HCU, a first torque to be output from an engine and a second torque to be output from a hybrid starter generator, which is connected to the engine, in consideration of the compensation torque and a system efficiency,
- wherein the compensation torque includes the first torque to be output from the engine and the second torque to be output from the hybrid starter generator,
- wherein a first duration during which the compensation torque is output from the hybrid starter generator, a second duration during which the electric motor is outputting the maximum torque, and a third duration during which a transmissive torque of an engine clutch is formed due to an engagement of the engine clutch are at least partly overlapped during the transition, and
- wherein the hybrid starter generator, the electric motor, and the engine drive a same driving axle of the hybrid vehicle.
A hybrid vehicle comprising:
- a motor control unit (MCU) configured to control an electric motor and a hybrid starter generator;
- an engine control unit (ECU) configured to control an engine;
- a hybrid control unit (HCU) configured to determine whether or not to perform a mode transition between a first mode in which the vehicle is driven using power of the electric motor and a second mode in which the vehicle is driven using power of both the electric motor and the engine, and to control the MCU and the ECU based on the determination, and
- wherein the HCU compares a required torque with a maximum torque of the electric motor when a transition from the first mode to the second mode is determined, determines a compensation torque when the required torque is greater than the maximum torque, and determines a first torque to be output from the engine and a second torque to be output from the hybrid starter generator, which is connected to the engine, in consideration of the compensation torque and a system efficiency,
- wherein the compensation torque includes the first torque to be output from the engine and the second torque to be output from the hybrid starter generator,
- wherein a first duration during which the compensation torque is output from the hybrid starter generator, a second duration during which the electric motor is outputting the maximum torque, and a third duration during which a transmissive torque of an engine clutch is formed due to an engagement of the engine clutch are at least partly overlapped during the transition, and
- wherein the hybrid starter generator, the electric motor, and the engine drive a same driving axle of the hybrid vehicle.
Dependencies are inferred from the claim text.