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Shift control method for hybrid electric vehicle

A technology of a hybrid electric vehicle and a control method, applied in the field of shift control, capable of solving problems such as reduced driving stability, insufficient clutch torque, and loss of braking force

Active Publication Date: 2022-04-08
HYUNDAI MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, we have found that when the transmission's clutch starts to release during regenerative braking, the vehicle's braking force is lost despite the driver pressing on the brakes, so the vehicle is in a dangerous driving mode where the driving stability of the vehicle is reduced
[0006] For example, we have found that during a power cut shift, when the regenerative braking torque changes suddenly, the input torque to the transmission varies excessively as a result, the clutch on the engaging side is undertorqued, and therefore the clutch on the engaging side and the releasing side The clutch's total torque becomes lower than the transmission's input torque, which causes the clutch to release

Method used

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  • Shift control method for hybrid electric vehicle
  • Shift control method for hybrid electric vehicle
  • Shift control method for hybrid electric vehicle

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Embodiment Construction

[0040] The following description is exemplary in nature only and is not intended to limit the invention, application or uses of the invention. It should be understood that throughout the drawings, corresponding reference numerals indicate like or corresponding parts and features.

[0041] Various forms of the present invention will be described in detail below with reference to the accompanying drawings.

[0042] One form of the invention may be applied to a hybrid vehicle in which a dual clutch transmission (DCT) is equipped as figure 1 the form shown. refer to figure 1 , the DCT includes: two clutches, namely, an engaging side clutch and a releasing side clutch, which are respectively denoted by reference numerals CL1 and CL2; an engaging side clutch actuator and a releasing side clutch actuator, the actuators operate CL1 and CL2, and denoted by reference numerals CLA1 and CLA2, respectively; and an engagement-side input shaft and a release-side input shaft, which are den...

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Abstract

The present invention provides a shift control method for a hybrid vehicle, so as to reduce the clutch release phenomenon caused by an excessive change in the input torque of the transmission during the shift of the vehicle. The method includes: utilizing a controller to an entry step executed in response to a power cut shift to enter torque shift control; an ramp up control step executed by the controller in which, during torque shift control, when the input torque of the transmission When the rate of change is equal to or greater than the reference value, the clutch torque on the engaging side is increased to correspond to the changed transmission input torque.

Description

technical field [0001] The invention relates to a shift control method for a hybrid vehicle. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not constitute prior art. [0003] For hybrid vehicles, regenerative braking is generally performed using an electric motor directly connected to wheels, thereby controlling the braking force of the electric motor to be continuously transmitted to the wheels, thereby improving fuel efficiency. [0004] That is, when the driver steps on the brakes while driving the vehicle, electric power is generated by regenerative braking of the motor to charge the battery. Therefore, the charged power of the battery is used as a power source capable of outputting power when the vehicle is restarted. Therefore, regenerative braking of the electric motor plays an important role in terms of fuel efficiency, even if it is also applied in the shifting section of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60W10/02B60W30/19
CPCB60W10/02B60W30/19B60K6/48B60K6/547B60W10/113B60W30/18127B60K2006/4825B60W2510/0695B60W2510/088B60W2710/027B60W20/40B60W2510/103B60W20/00Y10S903/945Y10S903/946Y02T10/62F16H3/727F16H59/14F16H61/0403F16H2059/147F16H2061/0407F16H61/688
Inventor 曺圣铉南周铉
Owner HYUNDAI MOTOR CO LTD