Spark duration time monitoring circuit for engine ignition system

Abstract

The invention relates to a spark duration time monitoring circuit for an engine electronic control ignition system. The spark duration time monitoring circuit is characterized in that a time processing unit channel of a central processing unit is connected with the grid electrode of a switching element IGBT through a drive circuit of the switching element IGBT; the collector electrode of the switching element IGBT is connected with the first end of an ignition primary coil; the second end of the ignition primary coil is connected with a vehicle-mounted direct-current power source; the collector electrode voltage of the switching element IGBT is connected to a time processing unit input port of the central processing unit after passing the spark duration time monitoring circuit, the central processing unit regulates the charging time, namely ignition energy of the primary coil in real time according to the monitored spark duration time, and the spark duration time is controlled within a certain range (please see the range in the specification). By means of feedback signals of the spark duration time monitoring circuit of the ignition system, the charging time, namely the ignition energy of the primary coil is regulated in real time, the spark duration time is controlled within a certain range, and the purposes that it is guaranteed that mixed gas in an air cylinder is completely burned every time when ignition of an engine is carried out, and the situation that erosion of electrodes of a sparking plug is accelerated due to tool much ignition energy is provided and the service life of the sparking plug is shortened is avoided are achieved.

Description

technical field [0001] The invention relates to a spark duration monitoring circuit of an electronically controlled ignition system of an engine, which belongs to the field of hardware circuits of electronic control units of automobiles. Background technique [0002] Engine electronic control technology has developed into a comprehensive engine management system, which mainly includes air intake, electronically controlled fuel injection, electronically controlled ignition, etc. The electronically controlled ignition system collects various sensors installed on different parts of the engine by the engine electronic control unit (ECU), judges the operating conditions of the engine, and selects the most reasonable ignition advance angle to ignite the ignition coil, thereby improving the combustion and ignition of the engine. emission. [0003] figure 1 It is a structural schematic diagram of an existing electric control ignition system. The ignition coil adopts a transformer...

AI Technical Summary

Problems solved by technology

However, too long spark duration (>700μs) does not significantly improve the combustion effect, and the heat generated by the ignition system during the discharge process will increase the temperature of the spark plug, accelerate the ablation of the spark plug electrode, and reduce the service life of the spark plug

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