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Diesel engine intake alcohol injection apparatus and injection control method

A diesel engine and diesel technology, which is applied in the field of diesel/alcohol fuel mixed combustion of diesel engines, can solve the problems of HC emissions, difficult fuel ignition, technical difficulty, etc., and achieve the effects of improving emission quality, improving emission quality, and reducing costs

Inactive Publication Date: 2004-01-28
TIANJIN UNIV
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Problems solved by technology

This method is high and technically difficult, and it is currently difficult to achieve in China
(2) High-quality diesel with ultra-low sulfur content is used, but the quality of domestically supplied diesel is difficult to meet the standard
At present, this method is mostly used to form mixed fuel after diesel oil is mixed with alcohol and emulsified for combustion. Its shortcoming is that the mixed fuel is easy to stratify; due to the increase of the latent heat of vaporization of the mixed fuel, it is difficult for the fuel to ignite at low temperature, and the engine is cold. Difficult to start; in addition, unburned HC emissions are serious under light load conditions

Method used

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  • Diesel engine intake alcohol injection apparatus and injection control method
  • Diesel engine intake alcohol injection apparatus and injection control method
  • Diesel engine intake alcohol injection apparatus and injection control method

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Embodiment

[0018] 1. Install a low-pressure needle nozzle on the intake manifold of the 485Q-1 (DI) diesel engine at a distance of 300mm from the cylinder head, and place an electric fuel pump in the alcohol fuel tank, and the fuel supply pressure is 300-350kPa. A speed sensor is installed on the flywheel housing, a torque sensor is installed at the power output end of the engine, and a cooling water temperature sensor is installed on the engine outlet pipe. The electronic control unit is mainly composed of MS-51 single-chip microcomputer, which can collect engine speed, torque, and temperature signals, and judge the working condition of the engine to send out the start signal of the nozzle. That is, when the diesel engine speed exceeds 1200r / min, the torque exceeds 70N.m and the cooling water temperature exceeds 70°C, MS-51 sends a high-level signal, and the nozzle opens to inject alcohol fuel to the engine, and the fuel injection quantity is changed from high level to continuous time t...

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Abstract

The present invention discloses an air-intake alcohol-spraying device of desel engine and its spray control method. Said device is mainly formed from nozzle mounted in the air inlet tube of engine ornozzle mounted in the inlet channel of every cylinder, electric control unit for driving nozzle to open or close it and various sensors of engine load, rotating speed, cam shaft position and cooling water temp. for transferring information to electric control unit. Said invention can substituted diesel oil by partial alcohol fuel, so that the carbon smoke discharge can be reduced by 40%, at the same time the discharge of NOx also can be reduced by above 30%.

Description

technical field [0001] The invention relates to a diesel engine intake air injection alcohol fuel device and an injection control method, belonging to diesel engine / alcohol fuel mixed combustion technology. Background technique [0002] Due to its good economy and reliability, diesel engines are widely used not only in trucks and city buses, but also in cars. However, due to the nature of diesel engine combustion, the problem of particulate and nitrogen oxide (NOx) emission standards is still the key to restricting its development. At present, the basic ways to solve the contradiction between reducing NOx and particulate emissions in the world at the same time are: (1) using high-pressure injection combined with exhaust gas after-treatment on diesel engines and other high-tech technologies. This approach is high and technically difficult, and it is currently difficult to achieve in China. (2) High-quality diesel with ultra-low sulfur content is us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/04
Inventor 姚春德王银山李云强郑贵忠
Owner TIANJIN UNIV
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