The high-speed step-up intervention control method for three-gear line control automatic transmission of electric car

Abstract

The invention discloses a high-speed step-up intervention control method for the three-gear line control automatic transmission of an electric car. The method variator detects D switch signal, the rotation speed signal n2 of transmission output shaft speed sensor, the rotation speed signal n1 of motor speed sensor, opening amount signal (i) Alpha ( / i) of accelerator pedal position sensor by TCU, to determine whether there is a need for rising the second gear from first gear, rising the third gear from the second gear, and the motor speed intervention control during each upshift. For example, the first gear up to the second gear, the target rotate speed of the second-speed motor is determined according to the target rotation speed function of the second-gear-up motor, and the electric-control unit of the motor controls the rotation speed of the motor to reach the target rotation speed, carrying out the intervention control of the speed-up process of the wire-controlled automatic transmission to realize the stable speed-up of the wire-controlled automatic transmission.

Description

technical field [0001] The invention relates to a control method of an automatic transmission, more precisely, an upshifting intervention control method for a three-speed wire-controlled automatic transmission of an electric vehicle. Background technique [0002] Automatic transmissions are widely used in various vehicles such as automobiles, electric vehicles, and construction machinery. The existing automatic transmissions mainly include hydromechanical automatic transmission (AT), metal belt continuously variable automatic transmission (CVT), mechanical automatic transmission (AMT) and dual clutch automatic transmission (DCT). [0003] The above-mentioned four types of automatic transmissions all adopt electronically controlled hydraulic servo devices to realize the control of the shifting process, which has complex structure, high cost and increased control difficulty and complexity. In particular, the executive mechanism of DCT includes: oil supply mechanism composed o...

AI Technical Summary

Problems solved by technology

[0005] In order to realize the power shift of the wire-controlled automatic transmission, that is, the driver does not need to interrupt the power between the electric motor and the wire-controlled automatic transmission during the shifting process. If the intervention control of the motor is not used, the motor speed cannot meet the shifting speed during the shifting process. requirements, causing shift shock and reducing the life of the electric motor and automatic transmission by wire

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