Method for determining gear shifting curve of two-gear box pure electric bus based on hardware-in-loop simulation

Abstract

The invention discloses a method for determining a gear shifting curve of a two-gear box pure electric bus based on hardware-in-loop simulation. The method comprises the following steps: performing calculating according to a wheel radius, a main reduction ratio, motor peak power and peak torque to obtain a preliminarily determined dynamic upshift point; decreasing the preliminarily determined power upshift point and the vehicle speed corresponding to the highest rotating speed of the motor at the first gear, and obtaining a finally determined power upshift point; setting the offset for the dynamic upshift point, obtaining an economical upshift point, and obtaining a complete upshift curve; shifting the upshift curve towards the negative direction of the x axis to obtain a downshift curve;and performing a standard cyclic working condition simulation test on different sums on a hardware-in-loop rack to obtain a sum value corresponding to the optimal economy. According to the method, thecalibration of the upshift and downshift curves is simplified, the calibration of different values is carried out on the two parameters of the economical upshift offset and the economical downshift offset, the hardware-in-loop simulation testing of the standard cyclic working condition is carried out, the parameter value with the optimal economical efficiency is selected, and no software change needs to be carried out on the vehicle control unit in the whole process.

Description

technical field [0001] The invention relates to the technical field of new energy vehicles, and more specifically refers to a method for determining a shift curve of a two-gear pure electric passenger car based on hardware-in-the-loop simulation. Background technique [0002] At present, in addition to the motor direct drive form without a gearbox, there is a more mainstream solution for pure electric buses, that is, a gearbox with two gears. This solution can significantly improve the power performance of the vehicle at low and medium speeds and the climbing ability. , and the motor can be miniaturized. At the same time, this scheme also puts forward new requirements for vehicle driving control, and the vehicle needs to have a suitable gear shift strategy. Due to the particularity of passenger car products, there are many vehicle configurations. A gearbox may be loaded on many different models, and the parameter configurations of vehicles between different models are quite...

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a method for determining the shift curve of a two-gear box pure electric bus based on hardware-in-the-loop simulation, in order to overcome the fact that the design of the shift curve of the existing two-gear box electric bus relies more on theoretical analysis, and the generated shift curves are compared Complicated, which increases the difficulty of the development of pure electric bus control software, and affects the power and economy of vehicle drive.

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