Apparatus and method for controlling creep torque of hybrid electric vehicle

Abstract

An apparatus and a method for controlling a creep torque of a hybrid electric vehicle that outputs the creep torque to improve shift feel and fuel consumption of the hybrid electric vehicle, may include the method for controlling a creep torque of a hybrid electric vehicle that may include detecting data of the hybrid electric vehicle for controlling the creep torque, determining whether a vehicle speed is greater than or equal to a predetermined speed and the hybrid electric vehicle is shifting from a current shift stage to 1 stage when the current shift stage is 3 stage or 2 stage, applying a creep torque factor depending on a shift stage and a brake amount when the hybrid electric vehicle is shifting from 3 stage or 2 stage to 1 stage, and controlling a motor to output the creep torque to which the creep torque factor is applied.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]The present application claims priority to and the benefit of Korean Patent Application No. 10-2014-0131638 filed on Sep. 30, 2014, the entire contents of which is incorporated herein for all purposes by this reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to an apparatus and a method for controlling a creep torque of a hybrid electric vehicle. More particularly, the present invention relates to an apparatus and a method for controlling a creep torque of a hybrid electric vehicle that outputs the creep torque to improve shift feel and fuel consumption of the hybrid electric vehicle.[0004]2. Description of Related Art[0005]A hybrid vehicle is a vehicle using two or more different kinds of power sources and is generally a vehicle that is driven by an engine that obtains a driving torque by burning fuel and a motor that obtains a driving torque with battery power.[0006]Hybrid electric ve...

AI Technical Summary

Benefits of technology

[0014]Various aspects of the present invention are directed to providing an apparatus and a method for controlling a creep torque of a hybrid electric vehicle having advantages of outputting the creep torque to improve shift feel and fuel consumption of the hybrid electric vehicle.

Problems solved by technology

In this shift process, a shift feel may be deteriorated when a torque variation is generated, a torque is less than 0, or a torque is too high.

As shown in FIG. 4, if the creep torque of the hybrid electric vehicle is increased and exceeds 0 torque before stopping and shifting, which results in deterioration of fuel consumption.

Moreover, a shift feel may be deteriorated during shifting before stopping because a torque variation is generated.

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