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Engine crankcase ventilation installation OBD diagnostic method based on electrical circuit

A technology for crankcase ventilation and diagnosis method, which is applied to crankcase ventilation, engine components, machines/engines, etc., can solve problems such as imprecise decision logic and no visual warning system, and achieve rigorous logic setting and fault judgment accuracy. High, avoid the effect of fault false trigger

Inactive Publication Date: 2020-10-13
DONGFENG AUTOMOBILE COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the problems of unrigorous judgment logic and no visual warning system in the prior art, and provide an OBD diagnostic method for an engine crankcase ventilation device based on an electric circuit with rigorous judgment logic and a visual warning system

Method used

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  • Engine crankcase ventilation installation OBD diagnostic method based on electrical circuit
  • Engine crankcase ventilation installation OBD diagnostic method based on electrical circuit
  • Engine crankcase ventilation installation OBD diagnostic method based on electrical circuit

Examples

Experimental program
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Effect test

Embodiment 1

[0065] An OBD diagnosis method for an engine crankcase ventilation device based on an electric circuit, the OBD diagnosis method for an engine crankcase ventilation device is based on a crankcase ventilation device detection circuit, and the detection circuit includes: a ventilation pipe 1, a first contact switch 2, a second Two contact switches 3 and the engine controller 4, the two ends of the ventilation pipe 1 are respectively press-fitted with the switch contacts of the first contact switch 2 and the second contact switch 3, and one end of the first contact switch 2 is connected in sequence After being connected with PCV resistance 5 and ECU resistance 6, it is connected with the 5 volt DC power supply in the engine controller 4, and the other end of the first contact switch 2 is connected with the ECU in the engine controller 4 after the second contact switch 3 is connected in series. The ground phase is connected, and a PVC voltage detection point 7 connected to the sign...

Embodiment 2

[0080] Embodiment 2 is basically the same as Embodiment 1, and its difference is:

[0081] The connecting wires of the first contact switch 2 and the second contact switch 3 are pre-embedded outside the ventilation pipe 1. When the ventilation pipe 1 is installed normally, the first contact switch 2 and the second contact switch 3 are all in a closed state. The second contact switch 3 was disconnected when the left end of 1 fell off, and the first contact switch 2 was disconnected when the right end of the ventilation pipe 1 fell off.

Embodiment 3

[0083] Embodiment 3 is basically the same as Embodiment 2, and its difference is:

[0084] The ignition key opening time refers to the time when the ignition key is placed in the ON gear; the engine running time refers to the duration of the engine starting from the stop state, passing through the starting state, and the engine speed is greater than the calibration threshold of the running state; the engine working state , judged according to the position of the ignition key and the engine speed, divided into four states: stop, start, run, and flameout; the ignition key opening time threshold, engine running time threshold, battery voltage minimum threshold and battery voltage maximum threshold are all set The value can be changed according to different models; the high threshold of PCV circuit voltage and the low threshold of PCV circuit voltage are set voltage values, which can be changed according to different models; the setting of high PCV circuit voltage fault_pending dur...

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Abstract

The invention relates to an engine crankcase ventilation installation OBD diagnostic method based on an electrical circuit. The diagnostic method is based on a crankcase ventilation installation detection circuit; the detection circuit comprises a ventilation pipe and an engine controller 4; the two ends of the ventilation pipe are respectively in press fit with switch contacts of a first contactswitch and a second contact switch; one end of the first contact switch is sequentially connected with a PCV resistor and an ECU resistor in series and then is connected with a 5V direct current powersupply in the engine controller; the other end of the first contact switch is connected with the second contact switch in series and then is connected with ECU ground in the engine controller; and aPVC voltage detection point connected with an engine controller signal acquisition point is arranged between the PCV resistor and the ECU resistor. The diagnostic method comprises a first step of diagnosis enabling and a second step of high voltage diagnostics and low voltage diagnostics. The design has the function of diagnosis enabling, the judgment logic is rigorous and reliable, and also a visual warning system is adopted to prompt a driver and find faults in time.

Description

technical field [0001] The invention relates to an OBD diagnosis method of an engine crankcase ventilation device based on an electric circuit, which is particularly suitable for strict judgment logic and realizes visual warning. Background technique [0002] According to the requirements of China's sixth-stage emission standards, the crankcase ventilation device of an automobile engine must adopt a closed structure in principle, and it is not allowed to directly discharge crankcase pollutants into the atmosphere. In order to meet the requirements of the regulations, the crankcase pollutants are usually introduced into the intake pipe from the cylinder head cover through the ventilation pipe, so that they can enter the cylinder again for combustion. When using this structure, the engine electronic control unit ECU must have a corresponding OBD diagnosis strategy, so as to ensure that when the crankcase ventilation pipe is disconnected and the crankcase pollutants are directl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02B77/08F01M13/00
CPCB60W50/0205B60W50/14F01M13/00F02B77/08G01R31/52G01R31/54
Inventor 王善元董波卢勇华岳崔巍王晓龙石磊李旭李楚桥
Owner DONGFENG AUTOMOBILE COMPANY
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