Two-gear AMT comprehensive gear shifting method of pure electric vehicle

A technology of pure electric vehicles and shifting methods, applied in the field of new energy vehicle power systems, can solve problems such as braking state considerations

Inactive Publication Date: 2019-12-10
HEBEI NORMAL UNIV
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AI Technical Summary

Problems solved by technology

[0005] In terms of comprehensive shifting schedules, Zhang Yu conducted research on the shifting schedules of pure electric vehicles, analyzed and designed the optimal dynamic and optimal economical shift schedules of pure electric vehicles, and studied the load identification technology, analyzed The impact of load changes on the shifting schedule was studied. On this basis, a comprehensive shifting schedule for pure electric vehicles based on working condition identification was proposed; The constant power output requirement of the drive motor, the value of the SOC of the battery pack, and the four parameters of the accelerator pedal opening, vehicle speed an

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  • Two-gear AMT comprehensive gear shifting method of pure electric vehicle
  • Two-gear AMT comprehensive gear shifting method of pure electric vehicle
  • Two-gear AMT comprehensive gear shifting method of pure electric vehicle

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Embodiment Construction

[0079] Such as figure 1 Shown, a kind of pure electric vehicle two gears AMT comprehensive shifting method, comprises the following steps:

[0080] Step 1: According to the performance requirements of the pure electric vehicle, propose the best dynamic shift schedule and the best economic shift schedule;

[0081] (1) The determination process of the optimal dynamic shift schedule is as follows:

[0082] Acceleration time is one of the evaluation indexes of pure electric vehicle dynamics, and its magnitude is related to the selection of shift points. In this paper, the acceleration time is defined as the acceleration time per 100 kilometers: the pure electric vehicle starts with the first gear, and shifts gears according to a certain shift point, and the time required for the vehicle speed to reach 100 km / h, as shown in formula (1):

[0083]

[0084] Among them: t is the acceleration time of 100 kilometers, u 1 is the vehicle speed at the shift point, a 1 is the accelera...

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Abstract

The invention discloses a two-gear AMT comprehensive gear shifting method of a pure electric vehicle, and belongs to the technical field of new energy vehicle power systems. Firstly, an optimal dynamic gear shifting rule and an optimal economical gear shifting rule are provided according to overall performance demands of the pure electric vehicle; based on the two optimal gear shifting rules, withthe gear shifting point vehicle speed and the gear shifting delay quantity as optimization variables, and with the overall vehicle energy consumption and the gear shifting point acceleration difference value as target functions, a comprehensive performance gear shifting rule optimization model giving consideration to both economy and dynamic property is built; and finally, the optimization modelis solved by using a NSGA-II genetic algorithm to obtain comprehensive performance gear shifting rules.

Description

technical field [0001] The technical field of the new energy vehicle power system of the present invention is, in particular, a two-speed AMT comprehensive shift method for pure electric vehicles. Background technique [0002] The shift schedule is the core technology of AMT control theory, which determines the performance of the power transmission system and affects the acceleration performance and driving range of pure electric vehicles. Therefore, the development of AMT shift schedules suitable for pure electric vehicles is to improve the dynamic performance of electric vehicles. and one of the key technologies of economy. After years of development, the shift schedule has changed from the initial single-parameter shift schedule, to the widely used two-parameter shift schedule, and then to the three-parameter shift schedule that basically conforms to the dynamic process of the vehicle, and on the basis of various basic shift schedules. A comprehensive shift control strat...

Claims

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Application Information

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IPC IPC(8): B60W30/19B60W50/00
CPCB60W30/19B60W50/00B60W2050/0031Y02T10/40
Inventor 王再宙张春香宋强
Owner HEBEI NORMAL UNIV
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