Method of optimizing shift schedule of stepped automatic transmission of electric vehicle

A technology of automatic transmission and electric vehicles, which is applied in the direction of control devices, etc., to achieve the optimal effect of vehicle power and economic comprehensive performance indicators

Inactive Publication Date: 2017-06-13
XIHUA UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned shift schedule based on experience and a shift schedule based on a single constraint condition, and to provide a multi-performance index comprehensive optimal shift s

Method used

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  • Method of optimizing shift schedule of stepped automatic transmission of electric vehicle
  • Method of optimizing shift schedule of stepped automatic transmission of electric vehicle
  • Method of optimizing shift schedule of stepped automatic transmission of electric vehicle

Examples

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example 1

[0097] Example 1: Set the weight of each sub-objective function to w d = 70%, w j =30%, to express that the driver hopes to drive the car in a mode that focuses on power and takes economical into consideration. Using the above method to optimize and calculate the optimal shift schedule of multi-performance with superior dynamic performance is as follows: Figure 5 shown.

[0098] Example 2: Set the weight of each sub-objective function to w d = 30%, w j =70%, to express that the driver hopes to drive the car in a mode that is more economical in energy consumption and at the same time takes power into account. The economically superior multi-performance comprehensive optimal shift schedule obtained by the optimization calculation of the above method is as follows: Image 6 shown.

[0099] Example 3: Set the weight of each sub-objective function to w d = 50%, w j =50%, to express that the driver has the same expectations for power and economy. The optimal shift law of p...

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Abstract

A method of optimizing shift schedule of a stepped automatic transmission of an electric vehicle comprises: constructing an integrated evaluation function for electric vehicle multi-performance integrated optimal shift schedule; with the integrated evaluation function as an optimization target, and basic conditions of vehicle driving and speed range corresponding to a motor high-efficiency area as constraints, using optimization algorithm to calculate multi-performance integrated optimal shift schedule for the electric vehicle stepped automatic transmission; by using the shift schedule for the electric vehicle stepped automatic transmission formulated by the method, it is possible to ensure optimal vehicle power and optimal ecological integrated performance indexes at the premise of allowing the vehicle to reflect a driver's shifting intention.

Description

technical field [0001] The invention relates to a method for optimizing the shift schedule of a stepped automatic transmission of an electric vehicle, and belongs to the technical field of the stepped automatic transmission of an electric vehicle. Background technique [0002] Shift schedule plays a very important role in vehicles equipped with automatic transmission, and it is one of the core technical links of automatic transmission system. At present, electric vehicles mostly use traditional automatic transmissions, so they have the same effect as the shift schedule of internal combustion engine vehicles, and both are the basis for gear decision-making. Considering its impact on motor efficiency, power and economy, the shift schedule is also There are certain differences. [0003] According to different control parameters, shift schedules are mainly divided into single-parameter (vehicle speed), two-parameter (vehicle speed, accelerator pedal intensity) and three-paramet...

Claims

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Application Information

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IPC IPC(8): B60W40/00B60W40/105B60W50/00
CPCB60W40/00B60W40/105B60W50/00B60W2050/0042B60W2520/10
Inventor 阴晓峰武小花孙华孙超王贵均
Owner XIHUA UNIV
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