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Method for improving low-temperature combustion soot emission and fuel economy of diesel engine

A fuel economy and low-temperature combustion technology, applied in mechanical equipment, engine control, machine/engine, etc., can solve problems such as fuel economy deterioration, soot emission increase, and increase the difficulty of combustion control, achieving combustion rate and Effects of shortening combustion duration, reducing heat transfer loss and exhaust loss, and improving control performance

Inactive Publication Date: 2013-04-24
TIANJIN UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

It can be seen that low-temperature combustion of diesel engines with low carbon smoke and low NO x Emissions are limited to a specific EGR ratio, and studies have also shown that the soot emission in the low-temperature combustion process is very sensitive to changes in the EGR rate. A sharp increase, significantly increasing the difficulty of combustion control
In addition, in the high proportion EGR area, although the emissions of soot and nitrogen oxides are close to zero, the fuel economy deteriorates significantly, and a large amount of HC and CO are generated

Method used

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  • Method for improving low-temperature combustion soot emission and fuel economy of diesel engine
  • Method for improving low-temperature combustion soot emission and fuel economy of diesel engine
  • Method for improving low-temperature combustion soot emission and fuel economy of diesel engine

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Embodiment 1

[0034] (1) The control unit reads the speed signal of the sensor installed on the engine crankshaft and the engine load signal of the sensor installed on the accelerator pedal respectively, and judges the load and speed condition of the engine according to the speed signal and engine load signal ; The compression ratio of the engine cylinder is controlled at 16, and the height of the piston ring groove from the top surface is 4mm. The diameter of the piston of the engine cylinder is 65.6mm, the depth of the piston pit is 18.8mm, the radius of the arc of the piston pit is 6mm, the ratio of the shrinkage diameter to the cylinder diameter is 62.5%, and the ratio of the pit depth to the cylinder diameter is 17.9 %.

[0035] (2) If the judgment result in step (1) is the low-medium load condition, the intake air condition controller outputs a control signal according to the read intake air temperature parameter, and the control method is as follows: reduce the exhaust gas recirculat...

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Abstract

The invention discloses a method for improving low-temperature combustion soot emission and fuel economy of a diesel engine. The method includes the steps of firstly, a control unit reads a rotation speed signal of a sensor mounted on a crankshaft of the engine and an engine load signal of a sensor mounted at an accelerator pedal, and judges operation load and rotation speed of the engine according to the engine load signal and the rotation speed signal; and secondly, a control signal is output according to the judging result obtained in the first step. EGR (exhaust gas recirculation) rate when low-temperature combustion soot emission increases evidently is delayed effectively by the method, EGR tolerance is increased from 35% to above 55%, and soot emission peak is lowered effectively.

Description

technical field [0001] The invention relates to the field of internal combustion engines, in particular to a method for reducing the emission of soot during the low-temperature combustion process of a diesel engine and improving the fuel economy of the low-temperature combustion. Background technique [0002] Due to its high torque and low fuel consumption, diesel engines are widely used in urban public transportation, logistics transportation, construction machinery and other fields. However, due to the essential characteristics of the diffusion combustion of the diesel engine, there are obvious local mixture-rich regions and high-temperature regions in the cylinder, so that the diesel engine has relatively high emissions of soot and nitrogen oxides. Moreover, the control strategies of soot and nitrogen oxide emissions from diesel engines are contradictory, that is, measures to reduce soot emissions often lead to increased nitrogen oxide emissions. Therefore, when controlli...

Claims

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Application Information

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IPC IPC(8): F02D43/00
Inventor 刘海峰尧命发郑尊清张全长
Owner TIANJIN UNIV
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