Diesel injection timing detection method based on AT89C52 single-chip microcomputer

Abstract

The invention provides a diesel injection timing detection method based on an AT89C52 single-chip microcomputer. The method includes the steps that a clamping type pressure sensor is clamped on a high pressure fuel pipe, output signals of a photoelectric encoder which is installed at the free end of a crankshaft are detected, and phase angle signals of a crank of a diesel are acquired through algorithm calculation; the pressure of the high pressure fuel pipe is detected, the moment fuel pressure begins to rise is judged according to a developed algorithm, corresponding crankshaft angle signals are read according to the signals and displayed as diesel injection timing outputs. The factors of elasticity of the fuel pipe, fuel compressibility and the like are eliminated through measured engine injection timing, and compared with a traditional injection timing measurement method, the diesel injection timing detection method has the advantages that injection timing detection is in real time and accurate, and is not limited by the working state of the diesel.

Description

(1) Technical field [0001] The invention belongs to the field of automatic control and detection of internal combustion engines. It relates to a diesel engine fuel injection timing detection method based on the AT89C52 single-chip microcomputer. The method realizes the automatic detection of the oil pipe pressure by means of the single-chip microcomputer technology, and completes the identification of the fuel injection starting point position, that is, the fuel injection timing, by means of automation theory and algorithm. (2) Background technology [0002] According to the working principle of diesel engine, the combustion quality of diesel engine is the main factor affecting the economy and emission characteristics of diesel engine. Diesel injection timing is the main factor affecting the formation of mixture and combustion quality. Therefore, whether it is theoretical research in the laboratory or engineering site, the detection of diesel injection timing is a prerequisi...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the structure of the fuel injector needs to be changed in the dynamic measurement method, and to provide a diesel engine fuel injection timing detection method based on the AT89C52 single-chip microcomputer

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