Anti-slip control method and device for four-wheel-drive hybrid power system

Abstract

The invention provides a method and device for anti-slip control over a four-wheel drive hybrid power system. The method for anti-slip control comprises the steps of respectively calculating a front axle slip error coefficient and a rear axle slip error coefficient; according to a current torque request of a driver, the front axle slip error coefficient and the rear axle slip error coefficient, obtaining a front axle torque distribution coefficient and a rear axle torque distribution coefficient; according to the front axle torque distribution coefficient and the rear axle torque distribution coefficient, adjusting front axle torque and rear axle torque which are preliminarily distributed by a vehicle control unit, and obtaining pre-distributed front axle torque and rear axle torque; respectively performing torque limitation on the pre-distributed front axle torque and rear axle torque, and obtaining anti-slip front axle torque and rear axle torque. The method and the device have the advantages that when a vehicle slips, the anti-slip front axle torque and the rear axle torque can be distributed intelligently, an optimal vehicle road adhesive force and an optimal off-the-hook capability are achieved, and driving stability and passing capability of the vehicle are effectively improved.

Description

technical field [0001] The invention relates to the field of new energy vehicles, in particular to an anti-skid control method and device for a four-wheel-drive hybrid power system. Background technique [0002] Vehicles with various structures in the field of hybrid vehicles can be divided into mild hybrid, medium hybrid and strong hybrid according to the mixing intensity. Among them, the weak hybrid mainly refers to the hybrid power of the BSG structure, that is, adding a starter motor to the engine. The starter motor has functions such as assisting in starting the engine, automatic shutdown and coasting recovery, and the fuel saving rate is about 5%. The medium hybrid mainly includes the addition of an ISG motor Or add a low-power rear drive motor, etc., in addition to realizing the weak hybrid function, it can also realize the low-speed pure electric function. The above-mentioned hybrids are generally two-wheel drive hybrids. When one side of the front wheel of the vehi...

AI Technical Summary

Problems solved by technology

If a hybrid system with a traditional four-wheel drive structure is used, on the one hand, due to the existence of structures such as a central differential, it will lead to problems such as complex structure and high cost; on the other hand, it cannot intelligently distribute the torque of the front and rear axles, which will affect the driving stability of the vehicle and vehicle passability

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