A Dynamic Coordinated Control Strategy for Mode-Switch of Hybrid Electric Vehicle Based on the Effect Control

Due to the direct connection between the engine and the compound power split hybrid transmission (CPSHT) in hybrid electric vehicle (HEV), engine ripple torque (ERT) can result in obvious jerks in engine starting process (ESP). In order to improve the riding comfort, two wet clutches are mounted in this novel CPSHT. This research developed a new coordinated control strategy and its effectiveness was verified in simulation. Firstly, the mechanical and hydraulic parts of the CPSHT were introduced, and the riding comfort problem during ESP in primary design was illustrated. Secondly, the dynamic plant model including ERT, driveline model and clutch torque was deduced. Thirdly, a coordinated control strategy was designed to determine the target engine torque, motor torque, clutch torque and the moment of fuel injection. A Kalman filter based clutch torque estimator was applied with the help of electric motors information. The simulation result indicates that proposed coordinated control strategy can indeed suppress vehicle jerk and improve the riding comfort in ESP.

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Gear Shift Coordinated Control Strategy Based on Motor Rotary Velocity Regulation for a Novel Hybrid Electric Vehicle

Applied Sciences ◽

10.3390/app112412118 ◽

2021 ◽

Vol 11 (24) ◽

pp. 12118

Author(s):

Qicheng Xue ◽

Xin Zhang ◽

Cong Geng ◽

Teng Teng

Keyword(s):

Electric Vehicle ◽

Control Strategy ◽

Hybrid Electric Vehicle ◽

Control Algorithm ◽

Sliding Friction ◽

Coordinated Control ◽

Velocity Control ◽

Gear Shift ◽

Shift Quality ◽

Hybrid Electric

This paper proposes a novel hybrid power system to improve the shift quality of a hybrid electric vehicle (HEV). After selecting a typical shift scheme, the study focused on the motor rotary velocity control algorithm and coordinated control strategy for the motor and clutch. The effects of various control algorithms on different target rotary velocities were analyzed, and a proportional-integral-derivative (PID)–bang-bang–fuzzy compound intelligent algorithm for a motor rotary velocity control system was investigated. In addition, to address the problems of the long synchronizing time required for the rotary velocity and large sliding friction work, which affect the shift quality during the process of engaging the clutch, a coordinated control strategy for the motor rotary velocity and clutch oil pressure was investigated. The research results showed that, compared with a gear shift coordinated control strategy based on a PID control algorithm, the strategy based on the PID–bang-bang–fuzzy compound intelligent control algorithm proposed here reduced the shift time and clutch slipping friction work by 35.7% and 19.2%, respectively.

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Torque coordinated control in engine starting process for a single-motor hybrid electric vehicle

Advances in Mechanical Engineering ◽

10.1177/1687814017705965 ◽

2017 ◽

Vol 9 (7) ◽

pp. 168781401770596 ◽

Cited By ~ 8

Author(s):

Minghui Hu ◽

Guochang Jiang ◽

Chunyun Fu ◽

Datong Qin

Keyword(s):

Electric Vehicle ◽

Control Strategy ◽

Hybrid Electric Vehicle ◽

Coordinated Control ◽

Engine Torque ◽

Motor Torque ◽

Parallel Hybrid ◽

Synchronization Phase ◽

Hybrid Electric ◽

Starting Process

To tackle the excessive output torque ripple during engine starting process of parallel hybrid electric vehicles, the engine starting process is divided into three phases in this study: engine cranking phase, speed synchronization phase, and after synchronization phase. The expressions of the vehicle jerk are derived from the vehicle dynamic formula in each phase, and the influences of various parameters on the jerk are analyzed. The coordinated control strategy for the clutch pressure and motor torque and that for the motor torque and engine torque are proposed. The simulation model for the single-motor parallel hybrid electric vehicle is established using MATLAB/Simulink, and the effectiveness of the proposed control algorithms is verified. Besides, a bench test is conducted and the test results show that the selected change rates of clutch pressure, motor torque, and engine torque can effectively coordinate the relation between clutch, motor, and engine. It can be concluded that the proposed control strategy satisfies the requirement of vehicle ride performance in engine starting in-motion process.

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Coordinated Torque Control for Mode-Switch between Motor and Engine Driving in Heavy Hybrid Electric Vehicle

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.86.779 ◽

2011 ◽

Vol 86 ◽

pp. 779-783 ◽

Cited By ~ 1

Author(s):

Yang Yang ◽

Jian Feng Huang ◽

Da Tong Qin ◽

Wen Hui Yang

Keyword(s):

Electric Vehicle ◽

Control Strategy ◽

Hybrid Electric Vehicle ◽

Torque Control ◽

Mode Switch ◽

Driving Mode ◽

Vehicle Simulation ◽

Hybrid Power ◽

Torque Control Strategy ◽

Hybrid Electric

Aiming the vehicle ride performance, the process of driving mode-switch for a heavy hybrid power system and parameter changes among the engine, motor, clutch and transmission during the Mode-Switch process between Motor and Engine Driving were analyzed. The coordinated torque control strategy was established for Mode-Switch between motor and engine driving. The heavy hybrid electric vehicle simulation model was developed based on the strategy. The performance for the mode-switch process between motor and engine driving was simulated and analyzed. The results show that introducing the coordinated control strategy reduces the torque fluctuation during the driving-mode-switch process and improves the vehicle drivability.

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