Test system and method for capture rate and scavenging efficiency of two-stroke engine

A testing system and engine technology, applied in the direction of engine components, machines/engines, mechanical equipment, etc., can solve the problems of difficult testing operations, less testing conditions, and lower overall engine efficiency, and achieve the effect of simple testing operations and small transformations.

Inactive Publication Date: 2020-05-12
TIANJIN UNIV
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AI Technical Summary

Problems solved by technology

[0002] Due to the large valve overlap angle of the two-stroke engine, it will cause a large ventilation loss, which will reduce the overall efficiency of the engine.
The method of direct sampling in the cylinder has the problems of difficult experimental operation and few test conditions, and the test method of tracer gas with low auto-ignition point will make the test accuracy not guaranteed

Method used

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  • Test system and method for capture rate and scavenging efficiency of two-stroke engine
  • Test system and method for capture rate and scavenging efficiency of two-stroke engine
  • Test system and method for capture rate and scavenging efficiency of two-stroke engine

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with accompanying drawing.

[0027] Such as Figure 1 to Figure 3 As shown, a test system for the capture rate and scavenging efficiency of a two-stroke engine acts on the cylinder 13, the top of the cylinder 13 is provided with a fuel injector 1, and the two sides of the top of the cylinder combustion chamber 14 are respectively provided with intake air Road 4 and exhaust channel 15, the inlet channel 4 leads to the tracer gas, and the exhaust channel 15 is connected to the tester 12 to detect the amount of tracer gas. The air inlet 4 is connected to a cylinder 9 through a pressure stabilizing chamber 5 , a pressure reducing valve 7 and a flow meter 8 .

[0028] The quality of the tracer gas passing into the intake passage 4 can be quantitatively calculated by controlling the pressure reducing valve 7 and the flow meter 8. In order not to affect the combustion of the two-stroke engine, the volume con...

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Abstract

The invention discloses a test system for capture rate and scavenging efficiency of a two-stroke engine. The test system acts on a cylinder, wherein the top of the cylinder is provided with a fuel injector, the two sides of the top of a combustion chamber of the cylinder are respectively provided with an air inlet channel and an air outlet channel, tracer gas is introduced into the air inlet channel, and the air outlet channel is connected with a tester to detect the amount of the tracer gas. The invention further discloses a test method. The test method comprises the steps that under the state that an air inlet valve and an air outlet valve are opened at the same time, a part of tracer gas directly enters the air outlet channel from the air inlet channel and is not combusted, the other part of tracer gas is left in the combustion chamber, and when the combustion stage is reached, the tracer gas left in the combustion chamber is completely combusted; and the average volume concentration of the tracer gas in the air outlet channel of the two-stroke engine within the set measurement time is measured by using the tester, so that the capture rate and scavenging efficiency of the two-stroke engine are determined. The system and the method is simple to operate, easy to implement and high in measurement precision.

Description

technical field [0001] The invention belongs to the field of engine testing, and in particular relates to a testing system and method for the capture rate and scavenging efficiency of a two-stroke engine. Background technique [0002] Due to the large valve overlap angle of the two-stroke engine, it will cause a large ventilation loss, which will reduce the overall efficiency of the engine. The quality of air exchange can be evaluated by the capture rate and scavenging efficiency. Therefore, the measurement of the capture rate and scavenging efficiency of the two-stroke engine is particularly important. The current trapping rate and scavenging efficiency testing technology has not been able to meet the current needs, so it is urgent to develop a test method for measuring the trapping rate and scavenging efficiency of two-stroke engines. [0003] The current methods for measuring the capture rate and scavenging efficiency of two-stroke engines are mainly the test method of d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02B75/02F02B77/08
CPCF02B75/02F02B77/08F02B77/081F02B77/084F02B2075/025
Inventor 裴毅强叶自旺许锴秦静王晨晰董蒙蒙彭忠张启锐
Owner TIANJIN UNIV
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