Ramp assist control method using permanent-magnet synchronous motor driving control system

Abstract

The invention provides a ramp assist control method using a permanent-magnet synchronous motor driving control system.The permanent-magnet synchronous motor driving control system has a ramp assist control mode and is used for ramp assist control of electric automobiles.The ramp assist control method is characterized by comprising the steps that a ramp assist control module judges whether an automobile enters the ramp assist control mode or not according to an automobile gear signal, an accelerator pedal signal, a braking signal and the wheel steering direction; when the automobile gear signal represents a forward gear, but the speed detected by a speed sensor module is a negative value, and meanwhile the braking signal and the accelerator signal are not detected out, the ramp assist control module starts to work, a fixed space voltage vector and a zero voltage vector are output to act with a permanent magnet of a permanent-magnet motor to produce torque, and the automobile is prevented from sliding backwards.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, and in particular provides a slope assist control method using a permanent magnet synchronous motor drive control system. Background technique [0002] With the development of society and the further expansion of demand, the energy crisis and increasingly serious environmental pollution are increasingly restricting people's lives. As a pillar industry of the modern economy, the automobile industry is also facing great challenges and tests. New energy vehicles have the advantages of zero emission, low noise, and energy saving. They are a means of transportation that is more suitable for the contemporary economy and society than traditional vehicles, and it is also an effective way to solve energy and environmental problems. [0003] Electric vehicles use electric energy as power, and the motor directly drives the vehicle, which has the advantages of fast speed increase and stability. In...

AI Technical Summary

Problems solved by technology

At present, the hill assist method for electric vehicles is generally to switch the control mode of the motor to the speed control mode once it is detected that the vehicle needs to park on the slope. Since the speed control must have a slipping behavior, the torque will be given, so The slope-assisted electric vehicles using this method cannot guarantee that they will not roll at all. It is only a matter of the length of the rolling distance. The good rolling is shorter, and the poor rolling is longer, depending on the motor controller. Control quality of speed loop

It can be seen that there is still a lack of effective slope assistance methods for electric vehicles at present.

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