Fault diagnosis circuit and fault diagnosis method of internal drive electronic control ignition system

Abstract

The invention discloses a fault diagnosis circuit of an internal drive electronic control ignition system. The fault diagnosis circuit comprises a sampling module used for sampling current flowing through a power switch tube so as to obtain a sampling current value, a calculation module which receives sampling current and carrying out calculation according to the sampling current so as to obtain an energy integral, a comparison module which receives the sampling current and the energy integral, comparing the sampling current with a current threshold value, and comparing the energy integral with an energy threshold value, and a judgment module which is connected with the comparison module and judges whether a fault occurs in a cylinder where an ignition coil is located according to the comparison results of the comparison module. The invention also discloses a fault diagnosis method of the internal drive electronic control ignition system. With the fault diagnosis circuit and fault diagnosis method of the internal drive electronic control ignition system of the invention adopted, various kinds of faults can be effectively diagnosed under a full-working condition. The circuit is simple in structure. The method is convenient to realize.

Description

technical field [0001] The invention relates to the technical field of electronically controlled ignition of engines, in particular to a fault diagnosis circuit and a fault diagnosis method of an internal drive electronically controlled ignition system. Background technique [0002] With the vigorous development of the automobile industry, the increase of vehicle comprehensive cost and emission-related environmental protection have received more and more attention. The automotive industry is accelerating research into new powertrains to reduce fuel consumption, increase power density and enhance vehicle robustness. As an important part of the vehicle power system, the ignition system makes a significant contribution to the improvement of system efficiency, the reduction of emission pollution and the increase of robustness. [0003] Coil ignition is currently the main ignition form of gasoline engines, natural gas engines, hydrogen engines and other fuel engines. The igniti...

AI Technical Summary

Problems solved by technology

For the internal drive, most of the ECUs of the engine management system on the market do not have the diagnostic function and protection function of the internal drive ignition. If a fault such as overcurrent or short circuit occurs for a long time or repeatedly, the ignition drive device inside the ECU will be burned. , resulting in the scrapping of the entire ECU, and even brings safety risks during vehicle operation

Internal drive ignition without diagnostic protection will cause more damage and cost more to repair than damage to other components such as the ignition coil alone

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