System and method for controlling torque for hybrid vehicle

Abstract

A system for controlling torque for a hybrid vehicle includes a power source having an engine and a motor. An engine clutch is provided between the engine and the motor. A driving information detector detects demand torque for driving. A traction controller controls oil pressure supplied into a brake to prevent a wheel slip and request torque reduction control from a vehicle controller when the wheel slip is detected. A vehicle controller controls engagement of the engine clutch for driving in a hybrid electric vehicle (HEV) mode, wherein the vehicle controller determines output torques of the engine and the motor to perform torque reduction control according to the torque reduction control, and when the request for the torque reduction control is released, the vehicle controller sets a gradient for torque restoration of the engine and the motor and applies the gradient to follow the demand torque for driving.

Description

technical field [0001] The present invention relates to hybrid vehicles. More particularly, the present invention relates to a system and method for controlling torque of a hybrid vehicle by restoring gradient control at a constant torque when torque reduction control of a traction control system (TCS) is released. The engine and electric motor, maintain the continuity of torque without torque step. Background technique [0002] In line with the continuous need to improve vehicle fuel efficiency and regulations on exhaust emissions in various countries, the demand for environmentally friendly vehicles has increased, and hybrid vehicles and fuel cell vehicles have emerged as options to meet this demand. Although a hybrid vehicle may be different from a fuel cell vehicle and an electric vehicle, a hybrid vehicle is defined here as a vehicle that has one or more batteries to use the energy stored in the battery as the vehicle's driving power, including ordinary electric vehicl...

AI Technical Summary

Problems solved by technology

However, in a hybrid vehicle in which two or more power sources, such as an engine and an electric motor, are operated, when the two power sources recover driving demand torque, since torque demand and response will occur between the two power sources Step-type difference in performance, so starting linearity deteriorates, resulting in sudden shocks

[0007] In addition, in a vehicle including two or more power sources, when the torque reduction control of TCS is released, and the output torque of the power source operated last changes sharply, the actual output torque will not Will vary with the dynamic characteristics of each power source, deteriorating drivability

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