A control method and control system for automatic shifting of a two-speed transmission of an electric vehicle

Abstract

The invention provides a control method for automatic gear shifting of an electric vehicle two-gear transmission. The control method includes the steps that after a finished vehicle is normally supplied with power, a gear shifting device is propelled to the forward gear, an accelerator pedal is treaded, a motor controller controls the output of a motor, and a transmission controller detects the rotating speed of the motor and the input quantity of the accelerator pedal. The transmission controller judges whether the finished vehicle meets the gear shifting condition or not according to the rotating speed of the motor and the input percentage of the accelerator pedal, and gear shifting is conducted when the rotating speed of the motor and the input percentage of the accelerator pedal meet the gear shifting condition; if the rotating speed of the motor and the input percentage of the accelerator pedal do not meet the gear shifting condition, the current status is maintained; the transmission controller is in communication with the motor controller, speed regulating and gear shifting begin, and the driving force of the finished vehicle is reduced to be zero; after gear shifting is completed, the finished vehicle recovers the driving force, and the finished vehicle runs continuously. The intention of a driver can be prejudged effectively, and the driving performance of the finished vehicle is good.

Description

technical field

[0001] The invention relates to the field of gear shifting of electric vehicles, in particular to a control method for automatic gear shifting of a two-speed transmission of an electric vehicle and a control system thereof. Background technique

[0002] At present, electric vehicles on the market are mostly driven by manual gearboxes or single-stage reducers, and manual gearboxes have disadvantages such as inconvenient operation and single-stage reducers that are difficult to match motors, which makes the economy and drivability of electric vehicles uneffective. combination. In order to solve this problem, CN200810125793 discloses a clutchless shift control method for pure electric vehicles. The driver controls the speed of the vehicle through the throttle, and the shift process in the gearbox is controlled by the relevant control device of the vehicle. auto-complete. However, this method cannot effectively predict the driver's intention in advance, making ...

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