Composite brake control device of four-wheel independent hub electric automobile

Abstract

The invention discloses a composite brake control device of a four-wheel independent hub electric automobile. The composite brake control device of the four-wheel independent hub electric automobile comprises a hub electric automobile single wheel brake system, a layered control architecture and a composite brake single wheel control program. The specific implementation mode comprises the following steps of firstly, determining whether the remaining capacity (SOC) exceeds a safety threshold value or not according to upper layer brake information; and if the remaining capacity exceeds the safety threshold value, exiting a regenerative braking function; and if the SOC does not exceed the safety threshold value, judging whether the braking is traditional braking or emergency braking accordingto the upper layer information; when a demand braking moment is less than a maximum allowed output value of a single wheel regenerative braking moment at the moment, providing all braking moment through regenerative braking; and when the demand braking moment is higher than the maximum regenerative braking moment allowed output value, enabling a motor system to brake with the allowed maximum regenerative braking moment. According to the composite brake control device of the four-wheel independent hub electric automobile, by using a layered control strategy, regenerative braking force energy can be effectively utilized to save energy.

Description

technical field [0001] The invention relates to the technical field of electric vehicle electronic control, in particular to a composite braking control device for four-wheel independent hub electric vehicles. Background technique [0002] Electronic control of electric vehicles refers to the combination of electronic technology and electric vehicles, so that electronic technology is applied to electric vehicles, so that electric vehicles can be well controlled. Regenerative braking control method” and the patent No. “CN102923128B” gave the control flow chart, but did not give the specific braking hardware structure diagram and control hardware structure diagram, and the reason for the brake wheel lock caused by emergency braking is The braking force applied to the wheels is too large, and the regenerative braking torque is expected to be output at the peak value when recovering the braking energy, so the regenerative braking at this time constitutes an inherent contradictio...

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Problems solved by technology

[0002] Electronic control of electric vehicles refers to the combination of electronic technology and electric vehicles, so that electronic technology is applied to electric vehicles, so that electric vehicles can be well controlled. Regenerative braking control method” and the patent No. “CN102923128B” gave the control flow chart, but did not give the specific braking hardware structure diagram and control hardware structure diagram, and the reason for the brake wheel lock caused by emergency braking is The braking force applied to the wheels is too large, and the regenerative braking torque is expected to be output at the peak value when recovering the braking energy, so the regenerative braking at this time constitutes an inherent contradiction with the braking stability of the vehicle, and because the motor and the hydraulic system The response speed is not synchronized, and a slightly larger regenerative braking force may cause braking instability. Under the working condition of anti-lock braking, the slip rate is used as the judgment condition, and when the slip rate is too high, it is limited by a small fixed value The moment of regenerative braking can recover energy when the road surface adhesion coefficient is relatively high, but there is still a risk of locking when the road surface adhesion coefficient is too low. Braking torque distribution

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