CNG (compressed natural gas) engine ignition advancer on basis of closed-loop control and method for controlling CNG engine ignition advancer

Abstract

The invention discloses a CNG (compressed natural gas) engine ignition advancer on the basis of closed-loop control and a method for controlling the CNG engine ignition advancer. The CNG engine ignition advancer which is an ignition angle advancer comprises an ignition advance angle measuring module, a crankshaft position signal modifying module, a crankshaft position signal conditioning circuit and an ignition pulse signal conditioning circuit. Ignition signals are inputted to the ignition pulse signal conditioning circuit, ignition signals outputted by the ignition pulse signal conditioning circuit and throttle valve position signals outputted by a throttle valve position sensor are respectively inputted to the ignition advance angle measuring module, signals outputted by the ignition advance angle measuring module are inputted to the crankshaft position signal modifying module, original crankshaft position signals outputted by a crankshaft position sensor are processed by the crankshaft position signal conditioning circuit and then are respectively inputted to the crankshaft position signal modifying module and the ignition advance angle measuring module, and signals outputted by the crankshaft position signal modifying module are inputted to an ECU (electronic control unit) of an engine. The CNG engine ignition advancer and the method have the advantages that continuous change of ignition advance angles of a dual-purpose fuel automobile can be controlled, and accordingly stable combustion of natural gas can be guaranteed.

Description

technical field [0001] The invention relates to a CNG automobile ignition technology, in particular to a CNG automobile ignition which can reduce the energy consumption when the automobile is in use, fully burn the automobile fuel, reduce engine exhaust emissions, improve engine power, and perform ignition in advance to adjust the ignition advance angle of the automobile Advancer and control method. Background technique [0002] Due to the reduction of oil resources and the increasing cost, traditional gasoline or diesel vehicles are increasingly unable to meet the development requirements, while natural gas, as a clean energy, is getting more and more attention, and natural gas is used as the main fuel In recent years, dual-fuel vehicles with gasoline as the auxiliary fuel have gained more and more people's attention and welcome because of their superior emission performance, low use cost, and good economic effect. [0003] However, due to the relatively stable chemical pr...

AI Technical Summary

Problems solved by technology

[0006] At present, the existing CNG ignition advancers on the market can only advance the fixed 6°, 9°, 12° or 15° according to the ignition advance angle preset by the user, and the advance angle cannot change with the change of the engine working condition , cannot adapt to the real-time change requirements of the ignition advance angle of the engine under different working conditions, and cannot make the engine achieve better performance under various working conditions

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