Diagnostic circuit and method for hazardous voltage interlock loop (HVIL)

A technology for diagnosing circuits and loops, applied to electric vehicles, electrical devices, transportation and packaging, etc., can solve problems such as incomplete fault diagnosis types, and achieve the effect of saving time and cost

Inactive Publication Date: 2017-11-03
东营俊通汽车有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] 1. The type of fault diagnosis is incomplete, only the short circuit and open circuit

Method used

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  • Diagnostic circuit and method for hazardous voltage interlock loop (HVIL)
  • Diagnostic circuit and method for hazardous voltage interlock loop (HVIL)
  • Diagnostic circuit and method for hazardous voltage interlock loop (HVIL)

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Embodiment Construction

[0020] In order to describe in detail the technical content, architecture, purpose and effect of the present invention, the following describes the implementation in conjunction with the accompanying drawings.

[0021] Such as figure 1 As shown in the vehicle system architecture of the loop interlock (HVIL), the loop interlock signal (HVIL) is generated by the VCU, and passes through the high-voltage component Un, the high-voltage component Un-1...the high-voltage component U2, the high-voltage component U1 (n is an integer, n≥1), finally enter the BMS, and the BMS completes the collection and diagnosis functions of the loop interlock (HVIL); all connections are electrically connected, and the electrical signal on the loop interlock (HVIL) circuit is a low-frequency signal (frequency is F), the loop interlock (HVIL) of each high-voltage component (including VCU and BMS) has a resistance to ground R0 (the resistance value, power, and withstand voltage are the same), and a total...

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PUM

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Abstract

The invention discloses a loop interlock diagnosis circuit and method. Loop interlock is a common method for electric vehicles to check the electrical integrity of all high-voltage components, high-voltage wires and connectors by using small electrical signals to connect all high-voltage components in series. By detecting the frequency and voltage amplitude of the loop interlock signal, the invention can accurately judge three faults of the loop interlock: open circuit, short circuit to power supply and short circuit to ground. Cooperating with the pull-down resistors of each high-voltage component node of the loop interlock, it can quickly and quickly locate which high-voltage component disconnection causes the loop interlock (HVIL, the same below) to disconnect, saving time and cost for maintenance.

Description

technical field [0001] The invention designs the high-voltage safety field of electric vehicles. Background technique [0002] At present, petrochemical resources are becoming increasingly tense, air pollution is becoming more and more serious, and new energy vehicles represented by electric vehicles are booming. The voltage of the high-voltage system of electric vehicles has far exceeded the safe voltage of the human body. A high-voltage loop interlock (HVIL) is added to the system to prevent electric shocks caused by misoperation by non-professionals. The national standard GB / T18384.3-2015 also recommends the use of a loop interlock (HVIL) to disconnect the high-voltage contactor (HVC, the same below). [0003] The high-voltage interlock system connects all high-voltage components in series by using electrical small signals, and checks the electrical integrity (continuity) of all high-voltage components, high-voltage wires and connectors. When the connector is released, ...

Claims

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Application Information

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IPC IPC(8): B60L3/00
CPCB60L3/0023
Inventor 贾少清朱刚王世良
Owner 东营俊通汽车有限公司
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