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Electric vehicle vacuum pump control method based on altitude signals

A technology of electric vehicles and control methods, applied in the direction of brakes, vehicle components, brake safety systems, etc., can solve problems such as inability to adapt to brake booster requirements, imperfect control logic of vacuum pumps, and insufficient fault response, etc., to achieve a reasonable and perfect response Measures, perfect strategy control, comprehensive effect of fault diagnosis

Pending Publication Date: 2022-03-18
YIBIN COWIN AUTO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the control logic of the vacuum pump in the prior art is not perfect. The same brake boosting control strategy is adopted at different altitudes and geographic locations, which cannot meet the needs of different geographic locations for brake boosting. At the same time, the fault detection strategy is too simple, etc. , and the response to the failure is not perfect

Method used

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  • Electric vehicle vacuum pump control method based on altitude signals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The vacuum pump control strategy scheme is as follows:

[0023] Vacuum pump control

[0024] First, the vacuum degree VAC is obtained according to the vacuum degree pressure sensor;

[0025] Obtain the current altitude value of the vehicle, and determine the external atmospheric pressure value AP of the current vehicle position by the altitude-air pressure calculation formula;

[0026] Use the external atmospheric pressure value AP and the vacuum pump test data at each altitude to formulate the AP-VAC table to determine the corresponding vacuum thresholds (VAC_on, VAC_off) and duty cycle for starting and stopping the vacuum pump at different altitudes. The working cycle is the cycle time of each start-up, and VAC_on and VAC_off are the opening threshold and closing threshold of the vacuum degree respectively.

[0027] According to the external atmospheric pressure value AP, look up the table to get the most suitable start-stop vacuum threshold and working cycle of the...

Embodiment 2

[0042] like figure 1 As shown, it is the control schematic diagram of the vacuum pump of the present application. The driving control of the vacuum pump is controlled by the vacuum pump controller, and the vacuum value detected by the vacuum sensor is sent to the vacuum pump controller for control. The vacuum pump controller Connect other controllers of the vehicle through CAN for data acquisition and collaborative control. The control strategy for the vacuum pump is as follows:

[0043] A method for controlling a vacuum pump of an electric vehicle based on an altitude signal, comprising: obtaining the current altitude value of the vehicle and converting it into an atmospheric pressure value AP of the vehicle's current position; the altitude value can be obtained through an altitude sensor and then converted into an inflating pressure value, or directly The atmospheric pressure sensor is used to collect the atmospheric pressure value AP, because the altitude value and the atmo...

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Abstract

The invention discloses an electric vehicle vacuum pump control method based on altitude signals, which comprises the following steps: acquiring a current altitude value of a vehicle and converting the current altitude value into an atmospheric pressure value AP of the current position of the vehicle; the start-stop vacuum degree threshold value and the work cycle of the vacuum pump at the current altitude are obtained through the AP-VAC comparison table, and the vacuum pump is controlled according to the obtained start-stop vacuum degree threshold value and the work cycle of the vacuum pump at the current altitude; wherein the AP-VAC comparison table is a corresponding relation table of the atmospheric pressure value matched with the altitude value, the vacuum pump start-stop vacuum degree threshold value and the work cycle, wherein the corresponding relation table is obtained through experimental calibration in advance. The method has the advantages that strategy control over the vacuum pump is more perfect, the requirements of a vehicle braking system for the vacuum degree of the vacuum pump at different altitudes and different atmospheric pressures can be met, the vehicle driving comfort is improved, meanwhile, fault diagnosis is more comprehensive and accurate, and reasonable and perfect countermeasures are also taken after the vacuum pump detects the fault.

Description

technical field [0001] The invention relates to the field of automobile braking control, in particular to an electric automobile vacuum pump control method based on an altitude signal. Background technique [0002] The structure of the braking system of new energy vehicles is basically the same as that of fuel vehicles. The difference is that fuel vehicles rely on the engine intake pipe as a vacuum source, while new energy vehicles do not have a vacuum source provided by the engine, so a separate vacuum pump is used for vacuum boosting. Through the vacuum pressure sensor installed in the vacuum tank or vacuum pipeline, the vacuum pressure in the vacuum tank can be detected in real time. The control unit controls the vacuum pump to start and stop according to the vacuum pressure value collected by the sensor, and detects the failure of the vacuum pump. [0003] However, the control logic of the vacuum pump in the prior art is not perfect. The same brake boosting control stra...

Claims

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Application Information

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IPC IPC(8): B60T13/52B60T17/22
CPCB60T13/52B60T17/22
Inventor 朱薇郭军李果
Owner YIBIN COWIN AUTO CO LTD