Control method of isg motor intervening in dual-clutch automatic transmission shifting

Abstract

The invention relates to a method for controlling an ISG (Integrated Starter Generator) motor to get involved in gear shifting of a dual clutch automatic transmission. Under a pure engine working condition, the ISG motor comprehensively gets involved in the gear shifting process of the DCT. The control method comprises the following specific steps of 1) enabling the ISG motor to work at upshift assistant mode or a downshift power generation mode in a torque phase of the gear shifting process of the DCT; 2) rapidly enabling the ISG motor to switch a working state and enter an uplift power generation mode or a downshift assistant mode in an inertial phase of the gear shifting process of the DCT; and enabling the ISG motor to provide a synchronous torque for enabling an engine and a target clutch driven disk to be rapidly synchronized; and 3) enabling the ISG motor to gradually exit the working mode and gradually switching an engine torque into a driving demand torque in a torque switching stage. Compared with the prior art, the method for controlling the ISG motor to get involved in the gear shifting of the dual clutch automatic transmission, provided by the invention, is advantaged in that torque coordination control problems among double clutches, the engine and the ISG motor in the gear shifting process of the DCT are effectively solved and so on.

Description

Technical field [0001] The invention relates to a shift control method of a dual clutch automatic transmission (Dual Clutch Transmission, DCT) for a hybrid electric vehicle (Hybrid Electric Vehicle, HEV), and in particular to an ISG (Integrated Starter Generator, ISG) motor intervening a dual clutch automatic transmission The shift control method can also be applied to the shift process of the hydraulic automatic transmission of a hybrid electric vehicle. Background technique [0002] In the traditional DCT shift process, the engine cooperates to complete the shift, and its torque change rate and change directly determine the speed synchronization time, but on the one hand, the engine torque response speed is slower and the speed synchronization time is longer (see figure 1 ); On the other hand, the engine operating point has a jump, which increases the difficulty of engine control, which is not conducive to the improvement of engine fuel economy and emissions. In addition, the c...

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Problems solved by technology

[0004] A literature search of the prior art found that the relevant control strategies of hybrid electric vehicles in the pure engine operation mode did not fully consider the power of the vehicle during the gear shifting process, as well as the dynamic response capability and accuracy of the engine, and there was no motor involved in DCT shifting. A precedent for blocking the control process

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