Engine scavenging coefficient online detection apparatus

Abstract

The present invention provides an engine scavenging coefficient online detection apparatus, including a box body, a sampling tube, and a gas component concentration sensor. The box body is divided into upper and lower chambers, the lower chamber is a sampling voltage regulator chamber, and the upper chamber is a constant pressure chamber, and the two chambers are connected. When sampling and measurement are performed, gas enters the upper chamber via the lower chamber by using a middle passage tube. The sampling voltage regulator chamber is connected to the sampling tube. The constant pressurechamber is connected to an air outlet interface. The gas component concentration sensor is installed on the sidewall of the constant pressure chamber of the box body. When sampling and measurement are performed, a component concentration of sample gas is instantaneously measured. Both sides of the box body are provided with a heating rod. The online detection apparatus of the present invention has a simple structure and a reasonable and reliable setting, so that online detection can be conveniently performed on an engine scavenging coefficient, an extended application range is wide, and the apparatus can be widely applied to an engine test room and a vehicle traveling on a road.

Description

technical field [0001] The invention belongs to the technical field of internal combustion engine work testing, and in particular relates to a device capable of on-line detection of the engine scavenging process. Background technique [0002] The performance of an internal combustion engine is largely dependent on its air exchange process. During the ventilation process, the intake valve and the exhaust valve have a period of overlapping opening, which is called "valve overlap period". During the valve overlap period, fresh air enters the cylinder from the intake valve, and at the same time, exhaust gas in the cylinder is expelled from the cylinder through the exhaust valve to complete the scavenging process. The scavenging process directly affects the composition of the compressed gas in the engine cylinder, and has an important impact on the subsequent combustion process. When the scavenging is insufficient, there will be more residual exhaust gas in the cylinder, which ...

AI Technical Summary

Problems solved by technology

More and more product engines have the problem of low scavenging efficiency, incomplete scavenging, and coexistence of air intake short circuit

[0004] In the actual vehicle operation process, due to the complex working conditions and environmental conditions, there is a large gap between the simulation calculation results of the scavenging process in the engine design and development stage and the actual situation in some working conditions, which makes the combustion system under the corresponding working conditions Difficulty in calibration

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