Misfire generator for vehicle-mounted fault diagnosis

A fault diagnosis and generator technology, applied in the direction of internal combustion engine testing, etc., can solve the problems of catalytic converter damage, automobile engine emission value exceeding the standard, etc., and achieve the effect of simple wiring, convenient connection and avoiding conflicts

Active Publication Date: 2012-09-05
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

An important part of the OBD system is the misfire diagnosis system. Misfire is an abnormal combustion phenomenon in the cylinder, which will cause the emission value of the car engine to exceed the standard seriously, and may cause the catalytic converter to be damaged due to overheating

Method used

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  • Misfire generator for vehicle-mounted fault diagnosis
  • Misfire generator for vehicle-mounted fault diagnosis
  • Misfire generator for vehicle-mounted fault diagnosis

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Embodiment Construction

[0015] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0016] Such as figure 1 As shown, the present invention includes a casing 1, the size of which can be set to 110×200×41 mm, small in size and easy to carry. The main operation of the present invention is completed through the panel, and plug-in wiring is adopted. A number of connection holes are provided on the panel of the casing 1, including: twelve cylinder ignition coil signal input holes C1-C12, a power supply positive connection BAT, a power supply negative connection GND and a fire signal output connection S_KILL. Among them, the twelve cylinder ignition coil signal input ports C1~C12 are divided into odd-numbered cylinder ignition coil signal input ports C1, C3, C5, C7, C9 and C11, and even-numbered cylinder ignition coil signal input ports C2, C4, C6 , C8, C10 and C12.

[0017] The panel of the housing 1 is also provided with two power fus...

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Abstract

The invention relates to a misfire generator for vehicle-mounted fault diagnosis, which comprises a housing, wherein a signal acquisition unit is arranged in the housing; an OR gate circuit; a counter; a misfire rate setting unit; a data storage unit; a trigger; a voltage conversion unit; a misfire exertion unit and a power supply unit. The panel of the housing is provided with a plurality of connection holes, two misfire switches, two misfire indication lamps, a plurality of misfire mode indication lamps, a misfire generator power switch, two misfire mode selection switches and two digital dial-up switches. The misfire switches are electrically connected between the data storage unit and the trigger. The misfire mode indication lamps are electrically connected with the output terminals of the signal acquisition unit and the trigger. The misfire generator power switch is electrically connected between the power supply unit and a storage battery on a vehicle. The digital dial-up switches are electrically connected with the misfire rate setting unit. The misfire generator is suitable for vehicles provided with an electronic ignition system without a distributor, and an ignition coil and spark plug integrated electronic ignition system.

Description

technical field [0001] The invention relates to a misfire generator, in particular to a misfire generator for on-board fault diagnosis. Background technique [0002] With the mass production and use of automobiles, the environmental pollution caused by automobile emissions is becoming more and more serious, and the detection of automobile emissions has become a concern. Various countries have successively issued regulations to control vehicle exhaust emissions, such as OBD (On Board Diagnostics, on-board automatic diagnostic system)-II regulations that are more common in the United States, and EOBD (European on board Diagnosis, European on-board diagnostic system) that is more commonly used in Europe . At present, my country has also issued some standards on OBD, such as HJ 437 2008 and HJ 500 2009, etc. Many regions have also begun to require that newly launched vehicles must be equipped with OBD systems. An important part of the OBD system is the misfire diagnosis system...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M15/11
Inventor 聂圣芳魏红军张云龙李永利
Owner TSINGHUA UNIV
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