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Isolated wiring short circuit detecting method and circuit

An isolated and circuit technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of PCB area affecting product miniaturization design, unsatisfactory sensitivity, complicated circuits, etc., to achieve low cost and high sensitivity High, strong anti-interference ability effect

Inactive Publication Date: 2016-12-21
CHINA NORTH ENGINE INST TIANJIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the sensitivity of the circuit is not satisfactory, and the line current needs to reach a certain value to react
The circuit is more complicated, and it also takes up a lot of PCB area, which affects the miniaturization design of the product

Method used

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  • Isolated wiring short circuit detecting method and circuit
  • Isolated wiring short circuit detecting method and circuit
  • Isolated wiring short circuit detecting method and circuit

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Embodiment Construction

[0028] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0029] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0030] The method for isolated detection of load wiring short circuit in the embodiment of the present invention includes the following steps:

[0031] Step 1. After setting the high-end public signal line and the low-end signal line of the fuel injection solenoid valve to be tested in the opposite and parallel direction of the current, they pass through the induction coil vertically, and collect the current signal changed by the external wiring through the induction coil;

[0032] The placement of the induction coil and the external wiring is as follows: because the fuel injection solenoid valve control signal is generally a high-end public signal line (one end of a group of solenoid va...

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PUM

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Abstract

The invention provides an isolated wiring short circuit detecting method and circuit. The circuit comprises an isolated collection circuit and a signal processing circuit in serial connection, the isolated collection circuit collects a control signal of an oil injecting solenoid valve via an induction coil, and the signal processing circuit determines whether the induction coil collects the signal via a comparator. Compared with the prior art, The method and circuit of the invention have the advantages that (1) the induction coil collects the signal in an isolated manner, so that weak signals at the rear end is prevented from interference of large-power signals, and the anti-interference capability is high; and (2) the short-circuit condition of external wiring can be detected every time the solenoid valve is driven, and the sensitivity is high.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to an isolated method and circuit for detecting a short circuit in a load connection. Background technique [0002] In the design of the diesel engine electronic control system, the solenoid valve is the key executive component of the entire diesel engine. Typical electronic control systems, such as electronically controlled unit pump systems, high-pressure common rail systems, etc., all adjust the fuel injection process through the switch control of the solenoid valve [0003] The drive of the solenoid valve requires the controller to provide a dynamic power signal with an output voltage of 24V and higher and a current of several to tens of amperes. In engineering applications, occasionally a single fault occurs in the wiring of the solenoid valve, that is, one of the high-end public lines or low-end signal lines will be grounded after the cable is broken, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02
CPCG01R31/50
Inventor 陈志瑞龚思扬申晓彦郭佳旭周慧芳耿万洋孟庆涛赵玲玲况涪洪
Owner CHINA NORTH ENGINE INST TIANJIN
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