Regenerative braking control method of electric car and device thereof

Abstract

The invention relates to a regenerative braking control method of an electric car and a device thereof, which are characterized in that a throttle signal, a braking signal, the current speed of the car and the SOC (state of charge) value of a battery are acquired during the running process of the car, when the current speed of the car is larger than the preset minimum feedback speed of the car, and the throttle opening is smaller than the preset feedback threshold value or the braking signal, the feedback moment is calculated according to the current speed and the braking depth; when the SOC value of the battery is smaller than the preset upper limit, the feedback moment is output to charge the battery pack; and when the SOC value of the battery reaches the preset upper limit, an electricmachine controller controls an electric machine not to generate braking feedback charge current, and braking is carried out according to the traditional braking method. The method and the device can increase the utilization rate of battery energy, the car can be kept smooth during the travelling, the regenerative braking can be also realized, and in addition, the SOC value of the battery can be real-timely monitored, too, so the battery is prevented from being damaged when the battery is over charged downhill.

Description

technical field [0001] The invention relates to an energy recovery method of a motor, in particular to a braking energy recovery control method and device for an electric vehicle. Background technique [0002] The key component of an electric vehicle is the battery, and the amount of energy stored in the power battery is an important factor in determining the driving range of an electric vehicle. However, the current battery technology is still the bottleneck in the development of electric vehicles, and breakthroughs have not been made, and the driving range of electric vehicles cannot meet the needs of users. If the kinetic energy when the vehicle decelerates is converted into electrical energy and recycled into the battery instead of being wasted by friction, this is undoubtedly equivalent to increasing the capacity of the battery. Under the existing technical conditions, doing so has important significance for improving the driving range performance of the electric vehic...

AI Technical Summary

Problems solved by technology

[0005] Although the above-mentioned prior art also considers the recovery of energy from the perspective of recovering the braking energy of the electric vehicle, so as to reduce the energy consumption of the electric vehicle and improve the battery life of the electric vehicle, the regenerative braking recovery method of the prior art may While affecting the braking effect of the vehicle, it is also possible to overcharge the battery

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