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Fault managing method for low-voltage storage battery of pure electric automobile

A low-voltage battery, pure electric vehicle technology, applied in the field of low-voltage battery fault management, DCDC converter output enable control, can solve the problems of reduced reliability, inability to drive the battery, inaccurate diagnosis of low-voltage batteries, etc., to achieve a long service life. Effect

Active Publication Date: 2014-04-02
奇瑞新能源汽车股份有限公司
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  • Abstract
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Problems solved by technology

[0006] The present invention designs a low-voltage storage battery failure management method for pure electric vehicles. The technical problem it solves is that the existing low-voltage battery diagnosis of pure electric vehicles may not be unable to run on electricity

Method used

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  • Fault managing method for low-voltage storage battery of pure electric automobile
  • Fault managing method for low-voltage storage battery of pure electric automobile
  • Fault managing method for low-voltage storage battery of pure electric automobile

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Embodiment Construction

[0036] Combine below Figure 2 to Figure 4 , the present invention is further described:

[0037] Such as figure 2 As shown, a DCDC converter output enabling control method, when the following seven conditions are all satisfied, the single-chip code enables the DCDC output port of the vehicle controller and enables the DCDC converter:

[0038] 1. When the key is in the ON gear;

[0039] 2. The DCDC converter feedbacks that the current function is normal;

[0040] 3. The power battery system has been connected;

[0041] 4. When the power battery power fed back by the battery management system is higher than a certain value;

[0042] 5. The charger feedbacks that the current vehicle is not charging;

[0043] 6. At this time, the vehicle controller will calculate the maximum discharge power of the current power battery according to the maximum discharge current fed back by the battery management system at this time;

[0044] 7. Any one of the failure conditions is not esta...

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Abstract

The invention relates to a fault managing method for a low-voltage storage battery of a pure electric automobile. A whole automobile controller confirms that a storage battery fault exists and lightens a storage battery fault lamp on an instrument according to fault information, when any one of the following four fault conditions is met: a DCDC (Direct Current to Direct Current) converter feeds back information that a storage battery is in a fault state at present to the whole automobile controller; a voltage-collecting sensor at a storage battery end is abnormal; a voltage at the storage battery end is abnormal; and an output circuit of the DCDC converter is abnormal. The fault managing method for the low-voltage storage battery provided by the invention is used for monitoring the state of the low-voltage storage battery of the pure electric automobile and is used for determining set DCDC output voltage according to feedback information from the DCDC, a charger, a storage battery temperature sensor and the like and timely opening DCDC to charge the storage battery. Meanwhile, a set of fault managing method for monitoring the storage battery is developed. If a fault happens, the storage battery fault lamp on the instrument lights up to remind a driver of repairing the automobile as soon as possible.

Description

technical field [0001] The present invention relates to a pure electric vehicle vehicle control method, in particular to a pure electric vehicle low-voltage storage battery failure management method, a DCDC output voltage management method and a DCDC converter output enabling control method. Background technique [0002] The high oil price has led to the rapid development of pure electric vehicles. Under the background of the current rapid development of pure electric vehicles, the fault diagnosis of electric vehicles is becoming more and more important, especially the diagnosis of key components that affect the function of the whole vehicle should be done as much as possible. Strict and rigorous diagnosis to avoid unreasonable failures such as false positives and false positives. Batteries are an indispensable key component of conventional gasoline-powered vehicles and electric vehicles. [0003] The traditional gasoline engine directly drives a small generator to charge t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L11/18H01M10/44
CPCY02E60/12Y02T10/7005Y02T10/7216Y02E60/10Y02T10/70Y02T10/72
Inventor 肖岩
Owner 奇瑞新能源汽车股份有限公司
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