Braking energy recovery and correction method for vehicle mass and road slope recognition

Abstract

The invention provides a braking energy recovery correction method for vehicle mass and road slope recognition, which comprises the following steps of: acquiring an accelerator pedal opening signal, a driving motor rotating speed signal and a vehicle speed signal by using a standard accelerator pedal opening sensor, a driving motor rotating speed sensor and a vehicle speed sensor on a vehicle, and calculating related parameters; vehicle mass and ramp gradient identification is completed as an identification sample; according to the method, vehicle parameters and dynamic balance equation parameters of a flat road surface are packaged and simplified into reference quantities, and the reference quantities are used as known quantities for identifying the slope gradient, so that the identification difficulty and precision of the slope gradient are improved; by recognizing the vehicle mass and the ramp gradient, the motor negative torque for regenerative braking is corrected, and braking energy recovery correction control is conducted on the pure electric vehicle during ramp braking, so that the adaptability of vehicle braking energy recovery is improved.

Description

technical field [0001] The invention relates to a braking energy recovery and correction method for pure electric vehicles, in particular to a braking energy recovery correction method based on vehicle mass and identification of the slope of the road surface. Background technique [0002] In the context of the increasing shortage of non-renewable resources in the world, more and more attention has been paid to the braking energy recovery technology of pure electric vehicles. Using this technology can effectively improve the driving range of the vehicle and improve the energy saving effect. The generation strategy of the motor negative torque for braking energy recovery is based on the level road surface. When the vehicle travels on the road with a slope, the change of the slope gradient will cause the change of the driving resistance; due to the load weight and the number of passengers The quality of the whole vehicle often changes, and the negative torque of the motor for b...

AI Technical Summary

Problems solved by technology

The recognition method based on the vehicle dynamics model needs to rely on an accurate vehicle dynamics simulation model, which is not suitable for complex and diverse real vehicles; the sensor-based recognition method requires a large number of high-precision sensors to collect vehicle parameters, which is costly and unfavorable. Product promotion and use; the parameter identification method based on the least squares algorithm cannot obtain accurate time-varying characteristics of the system, and the identification accuracy of changing vehicle quality and road slope is low, which cannot meet actual needs

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