Hybrid vehicle control method and system for low adhesion road surface

Abstract

The invention relates to the technical field of hybrid vehicles, and provides a hybrid vehicle control method and system for a low adhesion road surface. The hybrid vehicle control method used for theP0 and P4 power configuration comprises the following steps that whether a current road surface is the low adhesion road surface or not is identified; and when the current road surface is the low adhesion road surface, the output torque of an engine is adjusted to reduce front wheel end torque of a hybrid vehicle, torque rise slope and output torque of a rear axle motor are adjusted to reduce rear wheel end torque of the hybrid vehicle and / or a strength of brake energy recovery used for the hybrid vehicle is reduced or a braking energy recovery function of the hybrid vehicle is inhibited. According to the hybrid vehicle control method and system, the low adhesion road surface where vehicle wheel drifting is prone to occurring is identified, the engine shaft end torque and the rear axle motor are subjected to special treatment aiming at the low adhesion road surface, the slip probability of the front wheel end is reduced, the stability of a rear wheel is ensured, the energy recovery strategy is optimized, and the situation that excessive recovery energy causes vehicle instability is avoided.

Description

technical field [0001] The invention relates to the technical field of hybrid vehicles, in particular to a method and system for controlling hybrid vehicles on low-adhesion road surfaces. Background technique [0002] At present, hybrid electric vehicles can be divided into four power configurations: P0, P1, P2, P3, and P4 according to the location of the motor in the power system. Among them, for P0, it is also called belt-driven starter generator (Belt Starter Generator, BSG), the motor is arranged in the front wheel train of the engine, and is coupled with the engine crankshaft through the belt; for P4, the motor is arranged in the rear axle, which can be connected with The engine provides torque to drive the vehicle at the same time, and can also be used as a drive module to output power, which is also called electric Axle Drive (eAD). For the hybrid electric four-wheel drive system with P0+P4 power configuration, the power of the front axle comes from the traditional E...

AI Technical Summary

Problems solved by technology

But for the motor, its torque response is fast, and dangerous situations such as rear wheel slippage and even tail flicking are likely to occur during low-attachment steering. movement and "thump-thump-thump" noise

[0007] 3) On low-adhesion roads, the HCU will generate a certain braking force when coasting energy recovery. At this time, the rear axle will generate a relatively large braking force, which is more likely to cause the wheels to lock up, and the vehicle is more likely to become unstable due to oversteering

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