Abstract
In order to improve the starting smoothness of new-energy vehicles under multiple working conditions and meet the driving intention better, and to make the control strategy have high portability and integration, a starting control method for vehicle based on state machine is designed. Based on inclination, starting of vehicle is divided into three working conditions: flat road, slight slope and steep slope. The method of vehicle starting control is designed, which includes five control states: default state control, torque pre-loading control, anti-rollback control, pedal control and PI (Proportion-Intergral) creep control. The simulation is carried out under the conditions of flat road, slight slope and steep slope. In terms of flat road and light slope, the vehicle travels below 3 km/h according to the driver’s intention, the speed is stable at 8 km/h during the creeping control phase and the jerk is lower than 5 m/s3. In terms of steep slope, the speed is controlled at 0 km/h basically and the 10 s-rollback distance is less than 0.04 m. The results show that the strategy can fully meet the driver’s intention with lower jerk, better dynamic and stability, and the method can achieve the demand of new-energy vehicle starting control.
Highlights
With environmental protection and energy issues becoming increasingly serious, the new-energy vehicle attracts more and more attention because of its low emission and high efficiency
The application software is composed of multiple battery management system (BMS), motor controller unit (MCU) and vehicle control unit (VCU)
The starting control strategy studied in this paper is integrated into torque arbitration calculation control strategy, which is integrated with accelerator pedal control strategy, brake pedal control strategy
Summary
With environmental protection and energy issues becoming increasingly serious, the new-energy vehicle attracts more and more attention because of its low emission and high efficiency. Compared with the control method based on logic threshold, computer hardware technology, the application of state machine in practical engineering has become it has the characteristics of greatly simplifying model complexity, clear logic and strong system more advantageous. With the continuous improvement of automatic code generation technology in starting which is often tested, revised in the development and control computer[18], hardware technology, the application of and state optimized machine in practical engineering hasprocess and upgrading process of new-energy vehicles. Theon analysis of driver’scontrol, intention, safetyfully control of driving torque and logical judgment are safety, method based state machine which considers driver’s intention, comfort and criticalthe in requirements starting controlof[18], whichstart is often tested, and optimized in stable the development and satisfies smooth on flat roadrevised and slight slope, and holding on steep process and upgrading process of new-energy vehicles.
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