Gas leakage detection method for engine cylinder

A technology of engine cylinder and detection method, which is applied in the direction of using liquid/vacuum degree for liquid tightness measurement, etc., can solve problems such as difficult to find leakage and air leakage, and achieve the effect of reducing maintenance cost, reducing maintenance time, and avoiding replacement of normal components

Inactive Publication Date: 2014-01-29
UNITED AUTOMOTIVE ELECTRONICS SYST
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  • Abstract
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  • Claims
  • Application Information

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  • Gas leakage detection method for engine cylinder
  • Gas leakage detection method for engine cylinder

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[0010] see figure 1 , Each working cycle of a four-stroke engine commonly used in motor vehicles consists of an intake stroke, a compression stroke, a power stroke and an exhaust stroke.

[0011] During the intake stroke, the intake valve opens, the exhaust valve closes, and fuel and air are injected into the cylinder through the intake valve to form a combustible mixture.

[0012] During the compression stroke, both the intake valve and the exhaust valve are closed, and the combustible mixture is compressed by the piston to increase the pressure and temperature in the cylinder.

[0013] During the power stroke, both the intake valve and the exhaust valve are closed, and the combustible mixture is ignited by the spark plug (gasoline engine) or self-igniting (diesel engine) to release heat energy, which further increases the pressure and temperature in the cylinder sharply and pushes the piston to move. output mechanical energy.

[0014] During the exhaust stroke, the intake ...

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Abstract

The invention discloses a gas leakage detection method for an engine cylinder. On the condition of no oil being sprayed to the engine, a motor is used to drive the engine to operate. If the compression stroke time of one or a plurality of cylinders of the engine is smaller than that of other cylinders and the power stroke time of the one or the plurality of the cylinders is larger than that of the other cylinders, determining the gas of the one or the plurality of the cylinders is leaked; if not, determining all the cylinders are complete in gas tightness. By the aid of the method, tightness of each cylinder of the engine can be determined rapidly, simply and accurately, the method can be applied in troubleshooting of vehicles, and repairing time can be reduced; normal components can be protected from being changed mistakenly, and repairing cost can be reduced.

Description

technical field [0001] The present application relates to a method for detecting the tightness of a cylinder of a vehicle engine. Background technique [0002] With the continuous growth of the number of automobiles, the pollution of automobile exhaust emissions has been paid more and more attention. In order to control environmental pollution, countries have increasingly strict requirements on vehicle exhaust emissions and OBD (On-Board Diagnosis, on-board automatic diagnosis system), which makes EMS (Engine Management System, engine management system) more and more complicated, thus The difficulty of maintenance after the vehicle breaks down is also continuously improved. [0003] Statistics show that engine misfires are one of the most difficult failures to pinpoint the root cause. The so-called engine misfire refers to the low ignition energy, poor combustion quality, incomplete combustion, or no combustion at all caused by improper ratio of air to fuel in the combusti...

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Application Information

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IPC IPC(8): G01M3/02
Inventor 赵燕李君
Owner UNITED AUTOMOTIVE ELECTRONICS SYST
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