Cylinder identification method on basis of speed gradient incremental threshold value

Abstract

The invention discloses a cylinder identification method on the basis of a speed gradient incremental threshold value. The cylinder identification method on the basis of the speed gradient incremental threshold value is characterized by comprising steps of calibrating an incremental threshold value for an engine, starting the engine and enabling an ECU (electronic control unit) to complete power-on reset; positioning a certain component inside a first ring of a crankshaft; starting pilot injection in an asynchronous oil injection procedure; injecting oil at a bottom dead center and igniting a top dead center in a starting procedure; increasing oil injected to a set gas inlet bottom dead center by a unit quantity after the engine is started, only igniting a corresponding compression top dead center of the set gas inlet bottom dead center when a speed gradient of the engine exceeds the incremental threshold value in a working cycle, monitoring the transient speed of the engine and continuously measuring the transient speed of the engine to obtain at least two transient speed values of the engine; and determining a particular stage of the working cycle of the engine by means of comparing the speed gradient of the engine to the incremental threshold value according to the measured transient speed values of the engine. The cylinder identification method has the advantages that the cylinder identification method is simple and reliable and is low in cost, and shortcomings of an existing cylinder identification method on the basis camshaft positions and an existing cylinder identification method on the basis pressure are overcome.

Description

technical field [0001] The invention relates to a method for judging a specific stage of an engine working cycle, in particular to a method for judging a specific stage of an engine working cycle by a speed gradient increment threshold. Background technique [0002] Engine management system involves embedded system application, sensor technology, automatic control technology and software algorithm design, etc. Generally, an engine electronic control system is mainly composed of an electronic controller (ECU), hereinafter referred to as ECU, a plurality of sensors and a plurality of actuators. The engine electronic fuel injection management system is an intelligent system with a high-reliability single-chip microcomputer as the core. It collects the required input signals during the engine operation, and sends control commands to each actuator after comprehensive analysis and judgment of the signals. Each actuator works according to the ECU program to realize the control fun...

AI Technical Summary

Problems solved by technology

[0008] The present invention overcomes the deficiencies of the prior art, and provides a method for judging the cylinder by the threshold value of the speed gradient increment, expecting to solve the problems in the prior art such as difficulty in judging the cylinder, high cost and low accuracy of judging the cylinder