Abstract
Hybrid electric vehicles (HEV) might cause new noise vibration and harshness (NVH) problems, due to their complex powertrain systems. Therefore, in this paper, a new longitudinal dynamic simulation model of a series-parallel hybrid electric bus with an active torsional vibration control module is proposed. First, the schematic diagrams of the simulation model architecture and the active control strategy are given, and the dynamic models of the main components are introduced. Second, taking advantage of the characteristics of hybrid systems, a method of determining the key dynamic parameters by a bench test is proposed. Finally, in a typical bus-driving cycle for Chinese urban conditions, time domain and frequency domain processing methods are used to analyze vehicle body jerk, fluctuation of rotational speed, and torsional angle of the key components. The results show that the active control method can greatly improve the system’s torsional vibration performance when switching modes and at resonance.
Highlights
IntroductionHybrid electric vehicles (HEV) have been widely adopted by the automotive industry as a practical solution to increasing fuel efficiency and extending driving range [1,2,3,4,5,6,7,8]
We reduced torsional vibration of an auxiliary power unit (APU) during engine cranking by optimizing the spring stiffness of the torsional damper and using an active proportion integration differentiation (PID) control strategy
This paper proposes a new longitudinal dynamics simulation model of a series-parallel Hybrid electric vehicles (HEV) for torsional vibration study, and a torsional active control strategy under typical working conditions was designed
Summary
Hybrid electric vehicles (HEV) have been widely adopted by the automotive industry as a practical solution to increasing fuel efficiency and extending driving range [1,2,3,4,5,6,7,8]. Because the configuration is more complicated, if the design is not properly executed torsional vibration problems are more likely to occur, such as torsional damper damage and broken shafts, but it provides a new means for torsional vibration control [9,10,11]. To develop a hybrid system with excellent performance and improve the powertrain configuration quickly and at low cost, simulation analysis is indispensable. Accurate kinetic parameters and control performance parameters for critical components are required in a closed drivetrain. Another research hotspot is concerned with how to add the torsional vibration active control module under the original driving and energy management control strategy
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