Torque distribution method based on vibration instability of PS-HEV transmission system

Abstract

The power-split hybrid electric vehicle has multiple working modes, which can be switched to different working mode according to different working conditions. The main switching process involved in the vehicle driving is the switch from the pure electric mode to the hybrid driving mode. This paper studies the mode switching process involved in the power-split hybrid electric vehicle driving process, and a nonlinear dynamic equation of the electromechanical coupling of the corresponding transmission system is established. Then the multi-scale method is employed to solve the dynamic equation, and the amplitude-frequency response curve is drawn. According to the curve, the effects of load, mechanical input excitation of the engine and motor electromagnetic excitation on the electromechanical coupling torsional vibration of the transmission system are studied. The engine and motor torque distribution schemes are obtained by analyzing the amplitude-frequency response curve of the torsional vibration characteristics of the system. The analysis results show that the vibration instability phenomenon of the transmission system can be avoided by establishing the nonlinear dynamic equation of the transmission system, analyzing the vibration characteristics of the vibration system, and optimizing the torque distribution of a PS-HEV at different working modes.

Event-triggered H∞ coordinated control based mode transition system of DM-PHEV

“…By solving equation (7), the first four natural frequencies of the system can be obtained as shown in Table 2. According to Zhang et al 35 the sensitivity analysis of the natural frequency to the stiffness can be written as…”

“…Besides, for PHEVs with a clutch between engine and drive-line, the MTP from EM to HM includes extra clutch engagement process which may deteriorate the ride comfort. 7 For PHEVs with power-split transmission architecture, engine and motor are coupled by a compound power-split device. As no clutch is located between the engine and motor, the key goal of controller design is to coordinate motor torque and engine torque.…”

Load Spectrum Compilation Method of Hybrid Electric Vehicle Reducers Based on Multi-Criteria Decision Making

“…However, the traditional fuel vehicle load spectrum is not suitable for hybrid electric vehicles, because the reducer of the hybrid electric vehicle is directly subjected to the torque load transmitted from the engine and the drive motor through the transmission. The motor torque has the characteristics of high frequency and fluctuation and its effect on the fatigue life of the reducer is different from that of the engine torque [8][9][10]. Therefore, because of the lack of Energies 2022, 15, 3293 2 of 18 load spectra suitable for hybrid electric vehicle reducers, it is of great significance to study the method of compiling the load spectra of hybrid electric vehicle reducers under typical road conditions.…”

An active multiobjective real-time vibration control algorithm for parallel hybrid electric vehicle

“…Owing to the introduction of the driving motor in HEV, the working mode of the powertrain is changeable, the distribution of power source torque is diverse and the change of excitation source and powertrain structure makes torsional vibration of hybrid power system more complicated. [1][2][3] However, the driving motor not only adds a variety of working conditions for the torsional vibration problem but also provides a new actuator for the solution of the torsional vibration problem. [4][5][6] Based on the above research background, many scholars have studied the method of reducing the torsional vibration of the powertrain by controlling the motor to output torque compensation actively.…”

“…Based on the above research, this paper studies the active vibration reduction control of parallel hybrid powertrain and proposes an active multiobjective real-time vibration control (AMRVC) algorithm based on MPC, which can balance the contradiction between ride comfort and dynamic performance, and meet real-time performance and multimode adaptability. The contributions of this paper are as follows: (1) The torsional vibration model of parallel HEV powertrain is established, simplified, and verified by experimental data, which provides the basis for the multimode adaptability and the application of the controller. (2) The proposed AMRVC algorithm can not only achieve active vibration reduction of hybrid electric vehicles, but also meet the requirements of multiobjective and good real-time application conditions by designing MPC controller that coordinates vehicle ride comfort and dynamic performance.…”