Torsional Vibration Prediction and Elimination Method of Hybrid Electric Bus Transmission System

Abstract

The invention relates to the field of hybrid power buses and provides a torsional vibration prediction and elimination method for a drive system of a hybrid power bus in order to improve torsional vibration detection efficiency of the drive system of the hybrid power bus and reduce detection costs. The method comprises the steps of establishing a torsional vibration detection platform, defining an independent variable of the drive system of the hybrid power bus, and determining an upper limit and a lower limit of the independent variable; obtaining an independent variable sample point matrix of the drive system of the experimental hybrid power bus from a design space; building an agent model of the drive system of the hybrid power bus; inputting the independent variable of the drive system of the to-be-detected hybrid power bus to the agent model to calculate a corresponding torque estimation value, and judging whether the drive system of the hybrid power bus generates torsional vibration in a running process or not; and if the torsional vibration is generated, performing optimization and modification on the value of the independent variable to enable vibration amplitude of a torque corresponding to the independent variable to be minimal, thereby eliminating the torsional vibration. The method is low in technical threshold, short in calculation time, high in prediction efficiency, high in accuracy, low in prediction cost and high in practicality.

Description

technical field [0001] The invention relates to the field of hybrid electric passenger cars, in particular to a method for predicting whether torsional vibration occurs in a transmission system of a hybrid electric passenger car and eliminating the torsional vibration when it is predicted that the torsional vibration occurs. Background technique [0002] Compared with internal combustion engine buses, the structure of the transmission system of hybrid electric buses is more complicated. Since changes in the structure of the transmission system and rapid changes in the motor torque will pose new challenges to the strength, stiffness and stability of the shafting of the hybrid bus, how to detect whether the torsional resonance occurs in the transmission system of the hybrid bus (referred to as torsional vibration) and how to eliminate torsional vibration is the main problem to be solved when designing and producing the transmission system of a hybrid electric bus. [0003] Su...

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Problems solved by technology

[0006] When the above method is used to test the torsional vibration of the transmission system of a hybrid electric bus, the modeling is complex and requires high modeling technology. It can only provide a reference for the follow-up experimental test, but not as the final analysis result; the preparation stage of the experimental test takes a long time, and the transmission system of each type of hybrid electric bus needs to be repeatedly tested, and the experimental process is expensive and inefficient , and once the torsional vibration phenomenon occurs during the experimental test, it is necessary to modify the unit dynamic parameters of the transmission system and perform the experimental test again, and how to modify the dynamic parameters of the transmission system is also a difficult problem

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