Energy feedback method and system for hybrid electric vehicle

A technology of hybrid electric vehicles and braking energy feedback, which is applied in hybrid electric vehicles, electric braking systems, motor vehicles, etc., can solve the problems of low efficiency of braking energy feedback, improve fuel economy and increase braking energy Feedback efficiency and the effect of extending battery driving range

Active Publication Date: 2016-07-20
BEIQI FOTON MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For this reason, the technical problem to be solved by the present invention lies in the technical problem of low braking energy feedback efficiency in the prior art, thereby proposing a hybrid electric vehicle that performs energy feedback respectively for various braking situations and improves energy feedback efficiency Energy feedback method and system

Method used

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  • Energy feedback method and system for hybrid electric vehicle
  • Energy feedback method and system for hybrid electric vehicle
  • Energy feedback method and system for hybrid electric vehicle

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Embodiment 1

[0063] In this embodiment, the deep hybrid system structure of the hybrid vehicle is as follows figure 2 shown. The engine back is connected with the clutch C1 driving disk, the clutch C1 driven disk is connected with the generator, the clutch C2 driving disk is connected with the generator back, and the clutch C2 driven disk is connected with the drive motor. The power battery is connected with the generator controller and the drive motor controller. The drive motor is followed by an electromechanical automatic transmission (AMT transmission), and the final drive is connected with the AMT transmission through a transmission shaft. The AMT transmission controller (TCU) controls the clutch and the gear selection mechanism to perform the gear selection operation.

[0064] The hybrid system can realize multiple working modes: when the clutch C1 is disengaged, the power battery supplies power to the drive motor (TM) and / or generator (ISG) to drive the vehicle, and this structure...

Embodiment 2

[0067] In this embodiment, an energy feedback method for a hybrid electric vehicle is provided, and the flow chart is as follows image 3 shown, including the following steps:

[0068] The first step is to obtain the current brake pedal opening value and the current vehicle speed, and determine the braking energy feedback torque value according to the current brake pedal opening degree and the current vehicle speed.

[0069] When the vehicle is running, the current recoverable energy value can be obtained through the current speed and the opening value of the brake pedal. The opening value of the brake pedal here can be 0-100%. When the opening value is 0, it means that the vehicle has not stepped on the brake pedal. At this time, it is in a coasting state. When the opening value of the brake pedal is greater than 0 , indicating that the brake pedal is applied, and the braking force is proportional to the opening of the brake pedal. When the opening of the brake pedal is 100%...

Embodiment 3

[0080] This embodiment provides an energy feedback method for a hybrid electric vehicle. The first step and the second step of the method are the same as the first step and the second step in Embodiment 1. Two working modes are explained separately.

[0081] Since the current working mode of the hybrid vehicle includes pure electric working mode, series mode, and parallel mode, when the clutch between the engine and the generator is separated and the power battery supplies power to the drive motor and / or generator to drive the vehicle, the structure is Pure electric mode; when the clutch between the engine and the generator is closed, the clutch between the generator and the drive motor is separated, the engine charges the power battery through the generator, and the power battery provides power for the drive motor at the same time to drive the vehicle. It is a series mode; when the clutch between the engine and the generator is closed, and at the same time the clutch between ...

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Abstract

The invention provides an energy feedback method for a hybrid electric vehicle. The method includes the steps that firstly, a braking energy feedback torque value is confirmed according to the current opening degree of a brake pedal and the current vehicle speed, the small value is selected from the braking energy feedback torque value and a torque value corresponding to the maximum charging power of a battery, a braking energy feedback torque required value is obtained, a current work mode of the vehicle is stopped according to the braking energy feedback torque required value, and braking energy feedback is conducted. By the adoption of the scheme, a brake pedal opening degree signal is used, the opening degree of the brake pedal ranges from 0% to 100%, the braking energy feedback torque value is confirmed according to the current braking degree, and compared with the prior art in which only a sliding state and a braking state are available, the method is more accurate. An analog quantity brake pedal signal is adopted in braking energy feedback provided by the scheme, the braking energy feedback torque of an electric generator and the braking energy feedback torque of a drive motor are reasonably distributed according to the current working state of a clutch and the work mode of the whole vehicle, the braking energy feedback efficiency can be improved, the running mileage of the battery is increased, and the purpose of improving fuel economical efficiency is achieved.

Description

technical field [0001] The invention relates to the field of hybrid electric vehicles, in particular to an energy feedback method and system for hybrid electric vehicles. Background technique [0002] In the 21st century, world energy issues and environmental protection issues have become prominent issues that limit the development of human society. Under this background, the automotive industry regards new energy vehicles as a research hotspot. In the research and development of new energy vehicles, how to improve energy storage and utilization, and how to improve the driving range of new energy vehicles have become urgent problems to be solved. During the deceleration process of new energy vehicles, a large amount of kinetic energy is converted into heat energy due to participation in mechanical braking or hydraulic braking. If the kinetic energy is recycled, it will definitely improve the energy utilization rate of new energy vehicles and prolong the service life of power...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L7/10B60W10/02B60W20/00
Inventor 邹正佳孔令安
Owner BEIQI FOTON MOTOR CO LTD
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