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System for flexibly adjusting EGR rate of supercharged diesel engine and adjusting method

A diesel engine, flexible technology, applied in the direction of charging system, mechanical equipment, engine components, etc., can solve the problems that the EGR system cannot increase the EGR rate, and it is difficult to reduce NOx emissions, and achieve the effects of NOx suppression, flexible EGR rate, and conflict resolution

Inactive Publication Date: 2021-01-12
HARBIN ENG UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to provide a flexible and adjustable EGR rate system for supercharged diesel engines to solve the technical problems that the existing EGR system cannot realize high EGR rate under heavy load conditions and is difficult to reduce NOx emissions under heavy load. Adjustment method

Method used

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  • System for flexibly adjusting EGR rate of supercharged diesel engine and adjusting method
  • System for flexibly adjusting EGR rate of supercharged diesel engine and adjusting method

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Embodiment Construction

[0016] The present invention is described in more detail below in conjunction with accompanying drawing example:

[0017] combine Figure 1-2 , The present invention includes an injection fluid control valve 3 , a working fluid control valve 4 , an ejector 5 , an injection fluid inlet pipe 101 , a working fluid inlet pipe 102 and a mixed fluid exhaust pipe 103 .

[0018] Wherein, the ejector 5 includes a nozzle 7, a mixing chamber 8, a diffusion chamber 9, a working fluid inlet 10, an ejecting fluid inlet 11 and a mixed fluid outlet 12, such as figure 2 shown. The ejector fluid inlet 11 , the working fluid inlet 10 and the mixed fluid outlet 12 of the ejector 5 are respectively connected with the ejector fluid module, the working fluid module and the mixed fluid module. The function of the ejector 5 is to use pressurized air to introduce the low-pressure exhaust gas at the rear end of the turbine into the mixed fluid module.

[0019] The injection fluid module includes an ...

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Abstract

The invention aims to provide a system for flexibly adjusting the EGR rate of a supercharged diesel engine and an adjusting method. The system comprises the diesel engine and a turbocharger, wherein an exhaust pipe of the diesel engine is connected with a turbine of the turbocharger, an outlet of the turbine is connected with the atmosphere and a driving fluid inlet pipe, the driving fluid inlet pipe is connected with an injector through a driving fluid control valve, a compressor outlet of the turbocharger is connected with a working fluid inlet pipe and a mixed fluid exhaust pipe, the working fluid inlet pipe is connected with the injector through a working fluid control valve, the injector is connected with the mixed fluid exhaust pipe, and the mixed fluid exhaust pipe is connected withan air inlet pipe of the diesel engine through an intercooler. According to the system, low-pressure useless waste gas passing through the turbine is led back into an air cylinder by aid of high-pressure air according to the injection action of the injector, a flexible EGR rate of the diesel engine and particularly a high EGR rate under a large-load working condition are realized on the premise that the working efficiency of the turbocharger is not affected, and the contradiction between turbocharging and the EGR rate of the diesel engine under the large-load working condition is solved.

Description

technical field [0001] The invention relates to a diesel engine, specifically a diesel engine with EGR. Background technique [0002] With the increasingly stringent emission regulations, higher requirements are put forward for diesel engine pollutant emissions, especially NOx emissions. At present, exhaust gas recirculation (EGR) is the main technical means to reduce the emission of nitrogen oxides (NOx) from diesel engines. This is because the introduction of exhaust gas increases the specific heat capacity of the mixture in the cylinder, reduces the maximum temperature of combustion, and the inert gas The increase will reduce the proportion of fresh air entering the cylinder and the oxygen concentration, and the combination of the two will suppress the formation of NOx. [0003] In the existing diesel engine technical scheme with a turbocharger and an EGR system, part of the exhaust gas discharged from the cylinder is used to drive the turbine of the turbocharger, so tha...

Claims

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Application Information

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IPC IPC(8): F02M26/07F02M26/19F02M26/21F02M35/10F04F5/16F02D41/00
CPCF02D41/0007F02D41/0077F02M35/10006F02M35/10091F02M35/10222F02M35/10255F04F5/16F02M26/07F02M26/19F02M26/21
Inventor 赵建辉刘伟龙陈修旻
Owner HARBIN ENG UNIV
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