Electric vehicle automatic shift control method and device

Abstract

The invention provides an electric vehicle automatic gear shift control method. The method includes the following steps that first, an initial state signal of an electric vehicle is acquired, and the electric vehicle is controlled to go forward and backward through the state signal of the electric vehicle; second, when the electric vehicle goes forward, a go-forward state signal of the electric vehicle is acquired and compared with a set signal, and the electric vehicle is controlled to perform conversion between high-speed gears and low-speed gears according to the comparison result. The electric vehicle automatic gear shift control method can effectively overcome the defect caused when the gears of the electric vehicle are manually shifted, effectively avoid power limitation of a wheel hub motor and guarantee power of the electric vehicle, the structure of a speed change structure can be simplified, cost is reduced, operation of a driver in the vehicle driving process can be simplified, driving safety can be improved, the control structure is simple, and accurate control is achieved.

Description

technical field [0001] The invention relates to the field of electric vehicles, in particular to an electric vehicle automatic shift control method and device thereof. Background technique [0002] As a new energy vehicle, electric vehicles are gradually being valued by people. Nowadays, electric vehicles are generally driven by permanent magnet synchronous or AC asynchronous power motors, and use fuel vehicle gearboxes. Manual shifting is required to meet driving requirements during driving. Although permanent magnet brushless hub motors do not require a gearbox and are widely used in electric two-wheeled vehicles, there are problems in the application of permanent magnet brushless hub motors in electric vehicles. Permanent magnet brushless hub motors are directly produced on the wheel hub , the main problem is that the size of the wheel hub is limited, and the power of the motor cannot be increased. The light weight of the two-wheeled vehicle only needs one brushless hub m...

AI Technical Summary

Problems solved by technology

[0002] As a new energy vehicle, electric vehicles are gradually being valued by people. Nowadays, electric vehicles are generally driven by permanent magnet synchronous or AC asynchronous power motors, and use fuel vehicle gearboxes. Manual shifting is required to meet driving requirements during driving. Although permanent magnet brushless hub motors do not require a gearbox and are widely used in electric two-wheeled vehicles, there are problems in the application of permanent magnet brushless hub motors in electric vehicles. Permanent magnet brushless hub motors are directly produced on the wheel hub , the main problem is that the size of the wheel hub is limited, and the power of the motor cannot be increased. The light weight of the two-wheeled vehicle only needs one brushless hub motor, while the car needs four brushless hub motors, and four controllers are required to control the four brushless hub motors respectively. The hub motor also needs a general controller to coordinate the control behavior of these four controllers, which makes the control complicated and the control accuracy is not high

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