Gear shifting method using economy shift schedule of blade electric vehicle

A pure electric vehicle and shifting regularity technology is applied in the shifting field that utilizes the economical shifting regularity of pure electric vehicles. It can solve the problems that are rarely studied and affect the performance of the whole vehicle, so as to reduce the number of charging times, prolong the life, The effect of saving power

Inactive Publication Date: 2013-08-28
BEIJING ELECTRIC VEHICLE
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is little research on the shift schedule of multi-gear pure electric vehicles, and the quality of t

Method used

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  • Gear shifting method using economy shift schedule of blade electric vehicle
  • Gear shifting method using economy shift schedule of blade electric vehicle
  • Gear shifting method using economy shift schedule of blade electric vehicle

Examples

Experimental program
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Embodiment Construction

[0019] 1. In order to realize the optimal economical shift control, it is necessary to first obtain the optimal economical shift schedule curve:

[0020] 1. Draw the driving characteristic curve and efficiency relationship graph of the motor at the first gear and the second gear on the same graph, such as figure 1 As shown in , take the vehicle speed as the abscissa, and the torque at the output end of the gearbox as the ordinate;

[0021] 2. Draw a horizontal line of constant driving force torque T0 in the overlapping area of ​​the 1st gear and 2nd gear efficiency diagram in the figure, that is, when the output driving force is T0, there are two choices of 1st gear and 2nd gear;

[0022] 3. Draw the efficiency value curves corresponding to the traction force T0 at different speeds of the 1st gear and 2nd gear in the same graph, as shown in figure 2 As shown, the intersection point A of the two curves, that is, at the vehicle speed before point A, the driving motor efficienc...

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Abstract

The invention relates to a gear shifting method using economy shift schedule of a blade electric vehicle. According to the method, firstly the optimal economy shift schedule curve is made, and driving characteristic curves and efficiency relational graphs of a motor in 1 gear and 2 gear are made in the same graph; a horizontal line of constant driving force torque T0 is made in an overlapped area of the efficiency graphs in the 1 gear and the 2 gear; efficiency value curves, corresponding to different vehicle speeds in the 1 gear and the 2 gear, of traction T0 are made in a graph, and the intersection of the two curves is an ideal gear shifting point; opening degree values of an accelerator of upshift points and downshift points of the 1 gear and the 2 gear are calculated; the obtained upshift points and the downshift points are linked, so the optimal economy shift schedule can be obtained. Then the shift schedule curve is written in a TCU gear shifting control program. A TCU of the electric vehicle receives an accelerator opening degree signal and a vehicle speed signal of a driver in gear shifting, after judgment, when an ideal gear shifting point reaches, the TCU controls a gearbox gear shifting actuator, and thus gear-shifting motion is achieved.

Description

technical field [0001] The invention relates to a gear shifting method for a pure electric vehicle, in particular to a gear shifting method utilizing the economical gear shifting rule of the pure electric vehicle. Background technique [0002] The pure electric vehicle is considered to be the development direction of the automobile industry, and its green design is the source of the sustainable development of the automobile industry. The national new energy industry plan has elevated pure electric vehicles to a strategic development level. At present, major automobile companies in various countries are paying attention to the research and development and industrialization of pure electric vehicles. [0003] At present, the biggest bottleneck hindering the industrialization of pure electric vehicles lies in batteries. The low energy density of batteries makes the driving range of electric vehicles unable to meet the needs of long-distance driving; therefore, how to improve t...

Claims

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Application Information

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IPC IPC(8): F16H61/02F16H59/02
Inventor 朱波张青平张农魏跃远柯南极
Owner BEIJING ELECTRIC VEHICLE
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