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Boosting hybrid power vehicle energy utilization ratio method and fault diagnosis method thereof

A technology for fault diagnosis of hybrid electric vehicles, applied in electric vehicles, vehicle energy storage, vehicle components, etc., to achieve the effect of reducing consumption and improving energy utilization

Inactive Publication Date: 2008-05-21
CHERY AUTOMOBILE CO LTD
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Problems solved by technology

In hybrid vehicles, reducing the load on engine accessories is an effective way to reduce fuel consumption and improve the energy utilization of power sources. At present, there is no effective way to solve this problem.

Method used

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  • Boosting hybrid power vehicle energy utilization ratio method and fault diagnosis method thereof

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Embodiment Construction

[0013] As shown in Figure 1, a converter (DC-DC converter) that converts high-voltage direct current into low-voltage direct current is installed between the power battery and the low-voltage battery to reduce the load on the engine of the hybrid electric vehicle and increase the power supply of the hybrid electric vehicle. energy utilization.

[0014] DC-DC converter faults are divided into three modes: charging fault mode, overcharge fault mode or self-failure mode.

[0015] The hybrid vehicle controller monitors the low-voltage battery. When the low-voltage battery cannot be charged normally or the low-voltage battery is lower than the minimum limit of the converter output voltage; or the hybrid vehicle controller detects that the converter output current is lower than the When the charging current of the low-voltage battery enters the charging failure mode, the vehicle controller of the hybrid electric vehicle closes the converter, and stops the idling shutdown and automat...

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Abstract

The invention relates to a method of lifting energy utilization ratio of hybrid engine vehicle and a method of failure diagnosis, which can lower the load of the hybrid engine vehicle, further lower consumption of automobile fuel and timely diagnose and treat the failure of high voltage direct current to low voltage direct current converter. The invention adopts the technical proposal that: a converter which can convert high voltage direct current into low voltage direct current is arranged between power batteries and low voltage battery. A whole vehicle controller of hybrid engine vehicle isused for monitoring the low voltage battery; when the low voltage battery cannot charge normally or the low voltage battery is lower than minimum limit value of output voltage of the converter; or thewhole vehicle controller of hybrid engine vehicle detects that the output current of the converter is lower than the charged current for the low voltage batter by the converter, thereby switching into charging failure mode; the whole vehicle controller of hybrid engine vehicle enables the converter to close, thereby stopping the function of idle speed shutdown and automatically restarting for thestarting the power motor.

Description

technical field [0001] The invention relates to a method for improving the energy utilization rate of a hybrid electric vehicle and a fault diagnosis method thereof. Background technique [0002] At present, high-efficiency, energy-saving, and environmentally friendly clean cars have become a new trend in the development of the automotive industry. For this reason, hybrid electric vehicle (Hybrid Electric Vehicle, abbreviated as HEV) has attracted more and more attention due to its combination of low emission advantages of electric vehicles and high specific energy advantages of internal combustion engine vehicles, and has become one of the new vehicles being developed at the current stage . The so-called hybrid electric vehicle is to install a low-power engine and an auxiliary power source (such as an electric motor) on a car at the same time to provide driving force for the vehicle. , and can take advantage of the advantages of no pollution and low noise of the motor. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/14B60L1/00
CPCY02T10/7005Y02T10/70
Inventor 王野林伟义
Owner CHERY AUTOMOBILE CO LTD
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