Device and method for monitoring blow-by quantity fault of engine

Abstract

The invention discloses a device and a method for monitoring blow-by quantity fault of an engine. The device comprises a respirator connecting pipe, a negative pressure suction chamber, a gas flowmeter, a suction pipe, a negative pressure exhaust chamber and an air pump, wherein an electric control valve is distributed on the respirator connecting pipe, and the rear end of the electric control valve communicates with the negative pressure suction chamber; the front end of the suction pipe communicates with the negative pressure suction chamber; the suction pipe is also provided with a one-wayvalve and the gas flowmeter; the negative pressure exhaust chamber is also arranged behind the one-way valve and the gas flowmeter, and the air pump is connected with the rear of the negative pressureexhaust chamber. According to the invention, the device and the method are adopted for the blow-by fault monitoring, so the accurate, quick and timely effects can be achieved.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to an engine blow-by gas fault monitoring device and method. Background technique [0002] Engine blow-by means that when the engine is working, part of the combustible mixture and combustion products will escape from the cylinder through the piston ring into the crankcase and finally be discharged into the atmosphere through the respirator (open respirator system). All engines have blow-by when they are in operation. When the engine has a fault such as cylinder scuffing or piston ring fracture, the blow-by gas will suddenly increase. If the engine is not shut down in time after cylinder scuffing and piston ring fracture occur, serious engine failure will easily occur and the entire engine will be scrapped. After the engine is equipped with the whole vehicle, due to various reasons, failures such as engine scuffing and other failures will also occur. When the engine supporting th...

AI Technical Summary

Problems solved by technology

When the engine supporting the whole vehicle is running on the road, the cylinder is scuffed. If it is not found and dealt with in time, the scuffing problem will lead to the melting of the top of the piston and the failure of the high-temperature deterioration of the engine oil, and the increase in the mechanical force of the connecting rod and the crankshaft. Rods and crankshafts are broken, the body is smashed, the engine is scrapped, etc., and even endanger the safety of vehicle drivers, passengers and road pedestrians under certain circumstances

However, because the design of the crankcase of many engines is becoming more and more complicated, for example, some are equipped with labyrinth ventilation devices, etc., during the period from the blow-by gas entering from the crankcase to the outlet of the respirator, the pressure in each area is unstable, and the air pressure may lag or have some Toggle, using a conventional air pressure sensor to monitor blow-by faults is impossible at all (also because blow-by gas generally carries corrosive gases such as foggy oil), so there is currently no better device and method for monitoring blow-by faults

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