关键词: 电液复合；车辆稳定性；硬件在环试验；控制策略

Abstract: With the development of new energy technologies and the increasing demand for vehicle safety, the stability control of electric vehicles has become a research hotspot. To enhance the handling stability of electric vehicles, this paper designs a hierarchical electro-hydraulic composite stability control system. This system calculates the required additional yaw torque through the upper-level fuzzy proportional-integral (PI) controller, while the lower-level system optimally allocates the torque demand in coordination with the motor and hydraulic system. A hardwarein-the-loop test platform is built based on CarSim, and it was verified under the sinusoidal delayed steering conditions with three different steering angles. Tests show that the electro-hydraulic compound control strategy outperforms the pure electric control and non-control schemes in terms of yaw rate tracking accuracy, centroid deflection angle convergence and braking response. Especially under the 270°extreme steering condition, its advantages are significant, effectively enhancing the vehicle's handling stability. This control system is effective and will be further optimized in vehicle performance in combination with active steering technology in the future.

Key words: electro-hydraulic hybrid; vehicle stability; hardware-in-the-loop testing; control strategy