Corner marking device of electronic fuel injection engine

Abstract

A corner marking device of an electronic fuel injection engine comprises an engine body, a rotor, a corner mark sensor and an electronic control unit (ECU). Being a magnetor or a flywheel and is coaxially fixed to an engine crankshaft, the rotor comprises an outer cylinder made of permeability magnetic materials, the outer cylinder comprises two sections of coaxial cylindrical surfaces different in radius, two steps are formed on the transition positions of the coaxial cylindrical surfaces in the circumferential direction, each circle the engine crankshaft turns, the steps turn around sensing parts of the corner mark sensor at the positions where the turning angle of the crankshaft is determined to generate two corner mark pulse signals, opposite in mark, namely a positive corner mark pulse signal and a negative corner mark pulse signal respectively, the corner mark pulse signals are inputted into the ECU which comprises circuits processing the positive and negative corner mark pulse signals, and engine crankshaft and operating circle phases can be sensed. By the aid of the corner marking device, cost of a system can be lowered, and the circle phases and ignition phases can be assuredly accurately determined.

Description

technical field [0001] The invention relates to engine electronic control technology, especially the fuel injection and ignition electronic control technology of single cylinder piston engine. Background technique [0002] Electronically controlled fuel / gas injection technology (engine electronic management technology, also referred to as EFI technology) is one of the main technologies for controlling harmful gas emissions of spark ignition engines and improving engine performance. Using closed-loop feedback electronically controlled fuel / gas injection technology and exhaust gas three-way catalytic conversion technology, it can precisely control the air-fuel ratio and ignition advance angle of the engine according to the requirements of the three-way catalytic converter, so that the three harmful gases of CO, HC and NOx Emissions have also been significantly reduced. [0003] In the process of controlling the ignition and fuel injection of the engine, it is necessary to acc...

AI Technical Summary

Problems solved by technology

[0004] However, for a single-cylinder four-stroke engine, such an angle marking system is more complicated, not only the cost of the crankshaft angle marking turntable is high, but also the calculation and processing of the angle marking signal is more complicated

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