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Vehicle electric braking method and system

A technology of electric braking and vehicle power, applied in electric braking systems, vehicle components, electric vehicles, etc., can solve problems such as potential safety hazards and weakened electric braking capabilities of vehicles, so as to ensure normal operation and avoid excessive battery power Effect

Active Publication Date: 2022-03-15
ZHENGZHOU YUTONG BUS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a vehicle electric braking method and system, which is used to solve the problem that the existing vehicle braking method causes the motor to withdraw from braking when the vehicle power battery cannot recover more power in heavy-load downhill conditions, which will cause The electric braking ability of the vehicle is weakened, and there are potential safety hazards

Method used

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Embodiment approach 1

[0038] Embodiment 1 includes the embodiment of the vehicle electric braking system and the embodiment of the vehicle electric braking method.

[0039] The vehicle electric braking system of this embodiment is as follows: figure 1 As shown, the system includes: an electric brake control device (not shown in the figure), a first motor controller 1 (hereinafter referred to as motor controller I), a second motor controller 2 (hereinafter referred to as motor controller II), A first motor 3 (hereinafter referred to as motor I), a second motor 4 (hereinafter referred to as motor II) and an eddy current retarder 9 .

[0040] Among them, the vehicle power system adopts a double-motor + two-speed planetary transmission structure. The motor controller Ⅰ is connected to the motor 1 through a high-voltage line to control the motor Ⅰ. The motor controller Ⅰ is integrated with a DC / DC module; the motor controller II is connected to the motor II through a high-voltage line to control the m...

Embodiment approach 2

[0056] Embodiment 2 includes the embodiment of the vehicle electric braking system and the embodiment of the vehicle electric braking method.

[0057] The difference between the vehicle electric braking system of this embodiment and Embodiment 1 is that: the vehicle electric braking system of this embodiment only includes one motor or more than three motors, and correspondingly each of the vehicle electric braking methods of this embodiment The distribution strategy of electric braking power in braking mode is adjusted as follows:

[0058] Judgment condition 1 and its corresponding braking mode 1: When the power of the vehicle power battery is less than the set lower limit of power, and the braking power required by the vehicle is not greater than the sum of the rated braking power of all motors, enter the first braking mode. mode; in the first braking mode, the distribution of electric braking power should meet: all electric braking power is provided by the motor;

[0059] J...

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Abstract

The invention provides a vehicle electric braking method and system, and belongs to the technical field of vehicle braking. According to the method, corresponding braking modes need to be selected to achieve vehicle braking according to the vehicle power battery electric quantity and P, when the battery electric quantity is smaller than the electric quantity lower limit value, the first braking mode and the second braking mode correspond, when the battery electric quantity is larger than the electric quantity upper limit value, the third braking mode and the fourth braking mode correspond, and electric braking power (namely P electric quantity) in the first braking mode is all provided by a motor; in the second braking mode, Pelectricity is equal to the sum of rated braking powers of all motors (namely PN machine) plus braking power (namely Pvortex) output by the eddy current retarder, and the Pvortex is smaller than or equal to the PN machine, so that the electric quantity of the battery can be prevented from being too low, and normal operation of the vehicle is guaranteed; in the third braking mode, P electricity is all provided by the eddy current retarder; in the fourth braking mode, Pelectricity is equal to the sum of the rated braking power (PN vortex) of the eddy current retarder and the braking power output by all the motors (P machine), and P machine is smaller than or equal to PN vortex, so that the electric braking capacity of the vehicle can be improved.

Description

technical field [0001] The invention relates to a vehicle electric braking method and system, belonging to the technical field of vehicle braking. Background technique [0002] At present, mining vehicles operating on the market can be divided into pure fuel engine mining vehicles, hybrid mining vehicles and pure electric mining vehicles according to different power sources. Regardless of the type of mining vehicle, it is necessary to study how to provide sufficient braking force for the mining vehicle to complete a smooth downhill in the heavy-duty downhill condition. [0003] For hybrid mining vehicles, for example, the Chinese invention patent application document with the application publication number CN110605967A discloses an auxiliary braking control method for heavy-duty vehicles, which uses the engine, motor and hydraulic retarder as the braking components of the vehicle , when the braking power demanded by the vehicle is small and the motor is sufficient to provid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L7/18B60L7/28
CPCB60L7/18B60L7/28
Inventor 陈慧勇邓伟王纪福张晓伟惠杰刘新猛
Owner ZHENGZHOU YUTONG BUS CO LTD