Series-connection braking energy-recovering system and method

Abstract

The invention discloses a series-connection braking energy-recovering system and method and belongs to the field of electric control and electric driving of electric cars. Specifically, the displacement change of a braking pedal during idle stroke is obtained by means of the method that a displacement sensor is additionally installed, so that when a user lightly steps the braking pedal, electric braking force can be loaded by an electric braking device according to the obtained displacement change, when the braking pedal is heavily stepped, hydraulic braking force is loaded by a hydraulic braking device, and meanwhile, the loaded hydraulic braking force and electric braking force are superimposed. According to the series-connection braking energy-recovering system and method, the electric braking force is generated before the hydraulic braking force, on the one hand, at most of the time, the electric braking force is provided, so that the loading frequency of the hydraulic braking force is decreased, and overall energy recovering rate is increased; and on the other hand, when the hydraulic braking force is generated, generation is a superimposed process, so that discomfort, brought by overquick loading of the braking force, of a user is avoided, and the driving and taking experience is promoted.

Description

technical field [0001] The invention relates to the field of electric control and electric drive of electric vehicles, in particular to a series braking energy recovery system and method. Background technique [0002] In the field of automobiles, electric vehicles, as clean new energy vehicles, are receiving more and more attention and promotion. Electric vehicles use high-voltage electric energy to drive the motor, and have a complete set of systems different from traditional vehicles, including power batteries, MCUs, motors, PTCs, DCDCs, air compressors, power distribution boxes, etc. However, due to the bottleneck of battery technology, there are still unfavorable factors such as low energy density and long charging time, which limit the wide application of pure electric vehicles. [0003] The improvement of battery energy density is a relatively long-term process. In the current stage of battery use, the effective use of battery energy should be strengthened to improve ...

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Problems solved by technology

[0005] In the process of realizing the present invention, the inventor found that there are at least the following problems in the prior art: when the brake pedal is lightly stepped on, there is no braking, and when the brake pedal is stepped on moderately and heavily, the brake pedal is not braked. Excessive power will cause user discomfort. In order to avoid user discomfort caused by excessive overall braking force in the prior art, the overall loading of electric braking force is limited. However, limiting the intensity of electric braking force loading makes the electric braking recovery system Overall recycling capacity is also limited

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