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A hybrid operation mode switching control method of a hybrid electric vehicle

A hybrid vehicle and working mode technology, applied to hybrid vehicles, motor vehicles, transportation and packaging, etc., can solve the problems of inaccuracy, different models cannot be borrowed from each other, waste of people, time and materials, and save cycle costs Effect

Active Publication Date: 2019-01-25
JIANGLING MOTORS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is actually a discrimination method similar to an empirical formula, which requires a large amount of data and later calibration as support, which is time-consuming and labor-intensive and not accurate enough.
In the actual development process of the whole vehicle, different models cannot be borrowed from each other, which will cause a lot of waste of people, time and materials

Method used

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  • A hybrid operation mode switching control method of a hybrid electric vehicle
  • A hybrid operation mode switching control method of a hybrid electric vehicle

Examples

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Effect test

Embodiment 1

[0030] see figure 1 , figure 2 , the hybrid working mode switching control method of the hybrid vehicle of the present invention, according to the actual working conditions of the motor, the hybrid working mode is divided into four operating modes: pure electric mode, traditional engine mode, power assist mode and power generation mode, and pure electric The mode is the default mode; in the traditional engine mode, the engine provides all the torque requested by the driver; in the other three modes, the motor will play different roles, in the pure electric mode the motor provides all the torque requested by the driver, in the assist mode the motor Provide part of the torque requested by the driver. In the power generation mode, the motor is dragged backwards to generate electricity;

[0031] 1) Pure electric mode, booster mode and power generation mode can directly enter the traditional engine mode under the premise of meeting certain conditions:

[0032] The pure electric ...

Embodiment 2

[0039] see figure 1 , figure 2 , the hybrid working mode switching control method of a hybrid vehicle in this embodiment is different from Embodiment 1 in that: further, several state quantities are determined in the following manner:

[0040] 1) The critical vehicle speed X for switching between pure electric mode and traditional engine mode is obtained through real vehicle test calibration;

[0041]2) The maximum torque T_Limit_Mot provided by the motor: It is determined by the inherent torque limit value of the motor and the motor torque limit value after considering the power consumption of high-voltage components, and the minimum value of the two is taken;

[0042] 3) SOC critical value SOC4 of battery pack power in the process of switching between pure electric mode and traditional engine mode: this value is the minimum battery pack power SOC value in EV operation mode, defined as 20%;

[0043] 4) SOC critical value SOC2 of battery pack power during the process of swi...

Embodiment 3

[0047] see figure 1 , figure 2 The difference between the hybrid operating mode switching control method of the hybrid vehicle in this embodiment and the first and second embodiments is that: further, the real-time working condition of the vehicle is monitored by the state machine using the state switching algorithm, and the state machine The 4 nodes are the four working modes. The input conditions of the switching function are the current vehicle speed, the SOC value of the battery pack, the torque requested by the driver, and the maximum torque parameter provided by the motor. The four working modes are switched according to the state machine. Build the algorithm model in Simulink / Stateflow, then compile it into machine language, and write it into the controller to realize the algorithm control.

[0048] The state machine is a directed graph consisting of a set of nodes and a corresponding set of switching functions, the state machine "running" by responding to a series of...

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Abstract

A hybrid operating mode switching control method of a hybrid electric vehicle, wherein a motor in a default pure electric mode provides all torque requested by a driver; in conventional engine mode, the engine provides all of the torque requested by the driver; electric only mode, The boost mode and the power generation mode meet certain conditions and directly enter the traditional engine mode: when the vehicle is in the traditional engine mode, the current vehicle speed, the requested torque and the battery charge SOC value are judged at all times. When the vehicle speed is less than the critical vehicle speed X, or the requested torque of the driver is less than the maximum torque value of the motor, or the battery charge SOC is greater than the critical value SOC4, the vehicle enters the pure electric mode; and when the vehicle speed is less than the critical vehicle speed X, the battery charge SOC is greater than the critical value SOC4. When the torque requested by the driver exceeds the maximum torque that can be transmitted by the engine and the transmission at the current vehicle speed, and the battery charge SOC is greater than a certain value SOC2, the power-assisted mode is entered; the battery charge SOC value is lower than a certain value SOC2, and the torque requested by the driver is lower than the optimal economic torque provided by the engine at the current vehicle speed, so the power generation mode is switched to the power generation mode.

Description

technical field [0001] The invention relates to a hybrid working mode switching control strategy of a hybrid vehicle, in particular to a method for adaptively switching the hybrid working mode according to the state of the vehicle. Background technique [0002] As a new energy vehicle, new energy vehicles can solve the exhaust emissions caused by fuel combustion of traditional automobile engines. They have the advantages of low environmental pollution, low noise, and high efficiency. They are an important trend in the development of the transportation industry in the future. [0003] In new energy vehicles, hybrid vehicles have both traditional engines and motors, so there are two power modes: pure electric and hybrid. Among them: pure electric is only powered by the motor, and the working mode is relatively single; while the hybrid mode is relatively complicated. According to different combinations of engines and motors, its working modes can be divided into four types: pur...

Claims

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Application Information

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IPC IPC(8): B60W20/20
CPCB60W20/20
Inventor 吴方义刘卫东王爱春邬杰
Owner JIANGLING MOTORS
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