Coordinated Engine-Start Control of Single-Motor P2 Hybrid Electric Vehicles with Respect to Different Driving Situations

Abstract

Abstract:To cut down the costs caused by the additional starter, single-motor P2 hybrid electric vehicles (HEVs) make use of the driving motor to propel the vehicle as well as start the engine, and accordingly the engine-start control becomes more difficult. To satisfy the passengers' demands, this paper developed different coordinated engine-start control strategies with respect to different situations. First, a detailed model for the single-motor P2 HEVs system was built and related parameters were presented. Then, the coordinated engine-start control architecture for the internal combustion engine (ICE), engine disconnect clutch (EDC), electric motor (EM) and 8-speed automatic transmission (AT) was analyzed. Considering with the different driving situations, soft start strategy and dynamical start strategy are individually proposed. Through the simulation, the above control strategies were validated in accordance with their control objectives. Last, to optimize the trade-off between driving performance and riding comfort, some key parameters were further discussed. This work not only decreases the difficulty of engine-start control in the single-motor P2 HEVs but also is helpful to improve the quality of engine-start.

Constructing a Single-Motor Hybrid Driving Mechanism for Completely Hybrid Electric Cars

“…In this context, hybrid vehicles, which combine the advantages of pure electric vehicles and traditional combustion engine vehicles, have gradually gained market share and reached a mature stage of technological development, showcasing outstanding performance in terms of energy conservation and environmental protection. 8 Hybrid drives can be categorized into two main types based on the power source configuration: double-motor scheme hybrid drives and single-motor scheme hybrid drives. 1 The double-motor scheme hybrid drive:…”

Progress in Automotive Transmission Technology

“…In control strategies, it is important to coordinate the engine torque, EM torque and clutch torque properly and precisely. Xu [129] proposed different engine-start control strategies with respect to riding comfort or a quick response under different starting conditions. To realize the smooth and fast engine start of a P2 PHEV, Yang [130] proposed a hierarchical mode transition control method based on a robust H ∞ controller.…”