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

A technology of AT89C52 and fuel injection timing, which is applied in the field of automatic control and detection of internal combustion engines, and can solve problems such as changing the structure of the fuel injector

Inactive Publication Date: 2014-03-26
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 d...

Method used

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

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Experimental program
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Embodiment 1

[0025] 1. According to the engine speed synchronization signal output by the photoelectric encoder installed at the free end of the crankshaft, a clamping pressure sensor is used to clamp on the high-pressure oil pipe, and a high-pressure oil pipe pressure is collected corresponding to each pulse rising edge signal output by the photoelectric encoder. To obtain the pressure change history in the high-pressure oil pipe;

[0026] The pressure sensor selects the pressure sensor of the reinforced TPM_YD1206 oil pipe, and fixes it on the side of the high-pressure oil pipe near the injector.

[0027] Choose a suitable photoelectric encoder (model: Omron E6C2-CWZ6C) and install it on the free end of the crankshaft of the diesel engine. In order to meet the measurement accuracy of fuel injection timing, the specification of the photoelectric encoder requires outputting 360 or more speed synchronization signals per revolution.

[0028] 2. Design a signal conditioning circuit for the pr...

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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...

Claims

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Application Information

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IPC IPC(8): F02M65/00
Inventor 张德福余明宸肖会超
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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