Automobile gear shifting control method

Abstract

An automobile gear shifting control method comprises the steps that oil charging phase stage control is conducted, specifically, the power end input torque is not changed, the oil pressure of a separation clutch is reduced to critical oil pressure from locking oil pressure, and the oil pressure of a combination clutch is reduced to contact oil pressure from oil charging oil pressure; the combined clutch oil pressure is increased from the contact oil pressure to the critical oil pressure, and the separated clutch oil pressure is gradually reduced from the critical oil pressure to the contact oil pressure; the oil pressure of the separation clutch and the combination clutch is kept unchanged, the motor assists the power end to rise or drop torque, and the rotating speed of the power end and the rotating speed of the driven end of the combination clutch are gradually synchronized; and lock-up phase stage control: the output torque of the power end is kept unchanged, the oil pressure of a separation clutch is reduced from contact oil pressure to zero, and the oil pressure of a combination clutch is increased from critical oil pressure to lock-up oil pressure. The constant output torque of the transmission in the gear shifting process can be achieved, and gear shifting impact is avoided.

Description

technical field [0001] The invention relates to the technical field of automobile control, and relates to a shift control method for automobiles. Background technique [0002] With the increasingly stringent automobile emission regulations and stricter requirements for automobile fuel economy, hybrid vehicles, as an important solution for energy conservation and emission reduction, have received more and more attention from OEMs. Parallel hybrid schemes such as P0, P1, P2, P3, P4 and combined schemes are improved on the basis of the original powertrain, with small changes to the original powertrain, low development costs, and high technology maturity. The typical scheme of technology adoption is also vigorously developing in various OEMs in China. The motor carried by the parallel hybrid vehicle has the functions of pure electric drive, starting and stopping the engine, adjusting the engine operating point, braking energy recovery, etc., which greatly reduces the fuel consu...

AI Technical Summary

Problems solved by technology

The starter motor does not intervene during the gear shifting process of fuel vehicles, and the gear shifting control process can only be completed by adjusting the engine output torque and clutch oil pressure. Due to the disadvantages of low control accuracy, slow torque response, and inability to adjust after the fuel is cut off, the engine torque causes The impact of fuel vehicle shifting is relatively large, and the control process is complicated

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