DC-DC converter fault diagnosis method for pure electric automobile

A pure electric vehicle, fault diagnosis technology, applied in the direction of electric vehicles, collectors, instruments, etc., can solve the problems of insufficient protection, excessive load current, etc., and achieve the effect of protection

Inactive Publication Date: 2009-09-30
CHERY AUTOMOBILE CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0009] Compared with traditional vehicles, the electrical equipment of the pure electric vehicle has increased a lot. In some extreme cases, the lo

Method used

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  • DC-DC converter fault diagnosis method for pure electric automobile
  • DC-DC converter fault diagnosis method for pure electric automobile
  • DC-DC converter fault diagnosis method for pure electric automobile

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Experimental program
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Embodiment Construction

[0023] figure 1 It mainly illustrates the relationship between the high-voltage electrical system, low-voltage electrical system and DC-DC converter of pure electric vehicles, and also reflects the basic system structure of pure electric vehicles. The high-voltage electrical system loop of a pure electric vehicle is mainly composed of a motor, an inverter and a high-voltage battery. The function of the inverter is to realize the mutual conversion between three-phase power and DC power. The low-voltage electrical circuit mainly includes various electric loads on batteries and pure electric vehicles. The function of the DC-DC converter is to convert the 250-volt high-voltage electrical system of a pure electric vehicle into a 12-volt low-voltage electrical system for the electrical load of the vehicle. In order to improve the efficiency of the vehicle's electrical system and fully manage the only energy source of the vehicle, the DC-DC converter here needs to be controlled by t...

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Abstract

The invention discloses a DC-DC converter fault diagnosis method for pure electric automobile. The DC-DC converter is diagnosed if there has some fault according to corresponding parameter state as output voltage value, voltage of low voltage battery and loaded current value of whole automobile; output voltage target control value of DC-DC converter is set according to environment temperature, and maximum error of the actual output voltage and target voltage control value is set; when actual voltage value of filtered low voltage 12V battery is higher than sum of set maximum error and target control value, and DC-DC converter is in working state, it is considered that fault occurs in DC-DC converter output voltage control logic. The fault diagnosis method of the invention can quickly and effectively detect possible fault, thereby provides better protection for DC-DC converter.

Description

technical field [0001] The invention belongs to the field of electric vehicle control, and realizes the management of the medium and high voltage batteries and low voltage batteries of the electric vehicle through the control of the DC conversion device, so that the medium and low voltage systems of the electric vehicle can work stably, reliably and safely. Background technique [0002] With the development of society and economy, the energy and environmental protection problems brought by traditional internal combustion engine vehicles have gradually attracted the attention of countries all over the world. Due to the increasing scarcity of world oil resources and the environmental pollution caused by vehicle exhaust emissions, domestic and foreign auto companies are striving to demand new energy as a power source. Automobiles are favored by experts from various countries. Of course, my country also regards the development of pure electric vehicles as an important aspect of...

Claims

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Application Information

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IPC IPC(8): G01R31/00H02J7/00
Inventor 刘小飞
Owner CHERY AUTOMOBILE CO LTD
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