Brake linear calibration method and system for electric vehicle

Abstract

The invention discloses a brake linear calibration method and system for an electric vehicle. The method comprises: acquiring a vehicle parameter by a vehicle controller and determining whether the vehicle enters a sliding feedback state based on the obtained vehicle parameter; if so, calibrating sliding feedback torque coefficients at different rotating speeds under all energy feedback levels andcalibrating the equivalence between an initial brake feedback value and a maximum sliding feedback value; under all energy feedback levels, calibrating a minimum braking depth opening value at entrance of brake feedback and calibrating a maximum braking depth opening value at exit of brake feedback; calibrating a maximum brake feedback torque opening value under all energy feedback levels; calibrating braking feedback torque proportional coefficients corresponding to all energy feedback levels at different rotating speeds; and calculating brake feedback torque corresponding to all energy feedback levels. Therefore, a technical problem of low linearity of electric vehicle braking is solved on the premise that the energy recovery is met; and thus the driving comfort is improved.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a braking linear calibration method and system for electric automobiles. Background technique [0002] With the rapid development of the automobile industry and the continuous improvement of people's living conditions, automobiles have become one of the indispensable means of transportation for people to travel. Car ownership is increasing year by year, and more and more people own private cars. At present, with the continuous improvement of people's awareness of environmental protection, new energy vehicles, especially electric vehicles, have developed rapidly. [0003] When electric vehicles are braking, there is braking energy recovery, which is superimposed with the mechanical braking of the brake pedal, which will inevitably destroy the original braking effect of the brake pedal, and the linearity of the brake pedal will inevitably be affected. In the process of switch...

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Problems solved by technology

[0004] For this reason, an object of the present invention is to propose a braking linear calibration method for electric vehicles to solve the technical problem of non-linear braking of electric vehicles under the premise of satisfying energy recovery, so that the braking feeling is smooth and the torque during braking Control linearity and improve driving comfort

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