Light diesel engine EGR (Exhaust Gas Recycle) intake control system
A control system and diesel engine technology, applied in engine control, charging system, mechanical equipment, etc., can solve the problems of the critical value of the EGR rate cannot be greatly increased, the combustion speed is reduced, and the EGR rate is increased, so as to achieve a compact structure and meet the emission requirements. Requirements, the effect of low failure rate
Inactive Publication Date: 2012-04-11
GUANGXI YUCHAI MASCH CO LTD
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Problems solved by technology
3. Reduce the burning speed
[0009] 3) It is difficult to greatly increase the EGR rate in the cylinder by changing the closing angle of the intake valve
[0010] 4) As the valve overlap angle decreases, the EGR rate will increase, but there is a critical value in the EGR rate that cannot be greatly increased
Method used
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[0028] A specific embodiment of the present invention will be described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiment.
[0029] Such as figure 1 As shown, the air intake control system of the entire diesel engine with EGR is composed of seven parts: the intake pipe 1, the intake throttle valve 2, the EGR conduit 3, the intake swirl control valve 4, the intake pipe 5, the electric control EGR valve 6, EGR cooler 7.
[0030] further as figure 2 As shown, the intake pipe is divided into two layers. The first pressure stabilizing chamber 8 of the intake pipe is at the bottom, and an intake swirl control valve 4 is installed at its front end; The plenum bronchus 12 is connected. After the exhaust gas is controlled and cooled by the electronically controlled EGR valve 6 and the EGR cooler 7 , it is introduced into the intake manifold 5 through...
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The invention discloses a light diesel engine EGR (Exhaust Gas Recycle) intake control system, which comprises an intake union pipe communicated with a fresh air source, and an intake throttle is arranged on the intake end of the intake union pipe, and is used for controlling the total intake of the fresh air; the intake union pipe is of a double-layer structure, wherein the lower layer of the intake union pipe is communicated with a first intake pipe pressure-stabilizing cavity and utilizes an intake swirl control valve to control the flow of the fresh air flowing into the first intake pipe pressure-stabilizing cavity, and thereby a fresh air intake assembly is formed; the root of the upper layer of the intake union pipe is provided with an EGR inlet, an electrically controlled EGR valve is utilized to control the flow of the cooled tail gas entering the EGR inlet, the tail gas and the fresh air are mixed in the upper layer of the intake union pipe, and enter a second intake pipe pressure-stabilizing cavity after being sufficiently mixed, and thereby an EGR tail gas intake assembly is formed. The system can obtain a controllable high EGR rate at medium and low speeds, and can also guarantee the volumetric efficiency in the high-speed section.
Description
technical field [0001] The invention relates to the field of diesel engines, in particular to an air intake control system with EGR for a light-duty diesel engine. Background technique [0002] The exhaust gas burned by the diesel engine during the working process contains NOx and other harmful gases to the human body. Therefore, the country clearly stipulates the NOx content in the engine exhaust in the environmental protection regulations. With the promulgation of the National III, National IV, and National V standards, the NOx content limit is becoming more and more stringent. This requires full consideration of the control of the limit value in the design and combustion development of the engine, not only to meet the national emission regulations, but also to take into account the performance requirements of the engine. [0003] The three elements of the formation mechanism of NOx in the exhaust gas are high temperature, oxygen enrichment, and combustion duration. That...
Claims
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Login to View More IPC IPC(8): F02D9/10F02M25/07F02M26/64
CPCY02T10/121Y02T10/12
Inventor 庞威赵贵
Owner GUANGXI YUCHAI MASCH CO LTD