A braking energy recovery control method for extended-range hybrid electric vehicle

Abstract

The invention discloses a braking energy recovery control method of an extended-range hybrid electric vehicle, which belongs to the technical field of hybrid electric vehicles. The control method includes the following steps: when the electric power of the power battery is not fully charged, the braking energy needs to be recovered; and then according to whether the engine range extender is in the working state, the driving motors are respectively generated with different power P mo To charge the power battery, ensure that the power generated by the engine range extender charged to the power battery is P e and the generated power P charged by the driving motor to the power battery mo The sum is not greater than the maximum charging power P of the power battery bat In the case of P e +P mo ≤P bat , so that the drive motor can charge the power battery with the maximum charging power, so that the engine range extender can charge the power battery with the minimum charging power in a relatively gentle manner when the state of the engine range extender is not changed frequently. Beneficial effect: the reliability of the engine range extender is improved.

Description

technical field [0001] The invention relates to the technical field of hybrid electric vehicles, in particular to a braking energy recovery control method for an extended-range hybrid electric vehicle. Background technique [0002] When a range-extended hybrid electric vehicle brakes the whole vehicle, part of the braking energy is consumed through mechanical braking, while the other part of the braking energy can be recovered through the drive motor, that is, under braking conditions, the drive motor will drive the entire vehicle Kinetic energy is converted into electrical energy and stored in the power battery to recover braking energy. The range-extended hybrid electric vehicle is essentially a series hybrid electric vehicle. In the extended-range hybrid electric vehicle, the engine range extender is used to drive the generator to generate electricity, thereby charging the power battery or providing electric energy to the drive motor, so that the drive motor It can drive...

AI Technical Summary

Problems solved by technology

[0003] However, in the current range-extended hybrid electric vehicle, when the vehicle is in the braking condition, it only depends on whether the power battery is fully charged as the judgment condition, and at the same time, according to the difference between the braking power of the vehicle and the maximum braking power of the driving motor relationship, to control and distribute the braking energy; although it can recover the braking energy, it does not take into account the working state of the engine range extender, and it is easy to be affected by the recovery of the braking energy of the driving motor during the braking process. The battery is charged. In order to avoid the sum of the regenerative braking power of the drive motor and the generated power of the engine range extender exceeding the maximum charging power of the power battery, it is easy to cause the engine range extender to shut down suddenly during braking. During driving conditions, the engine range extender is restarted to charge the power battery, which directly leads to frequent activation of the engine range extender, resulting in lower reliability of the engine range extender and reduced driving comfort

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