An Active Sealing Device Used in Piston Ring-Cylinder Liner Friction Measurement System

Abstract

The invention belongs to the field of testing of internal combustion engines, and particularly relates to an active sealing device for a measurement system for the friction force between a piston ring and a cylinder sleeve. The active sealing device for the measurement system for the friction force between the piston ring and the cylinder sleeve comprises a cylinder cover, a floating cylinder sleeve, a piston, a cylinder body, a high-pressure guide pipe, an air valve, a high-pressure tank, an air compressor, a pressure sensor, an in-cylinder pressure sensor, a pressure measurement and control instrument and a sealing cavity. The pressure measurement and control instrument actively controls the air valve through contrastive analysis of pressure values measured by the pressure sensor and the in-cylinder pressure sensor, so that the value of pressure in the sealing cavity and the value of the in-cylinder pressure of a combustion chamber are made synchronous and equal, and active sealing of the floating cylinder sleeve is achieved. A force sensor is mounted between the floating cylinder sleeve and the cylinder body and used for measuring the friction force between the piston ring and the cylinder sleeve. By adoption of the active sealing device for the measurement system for the friction force between the piston ring and the cylinder sleeve, active sealing of the cylinder sleeve is achieved, leakage of gas in a cylinder is prevented, and it is ensured that the friction force between the piston and the cylinder sleeve is measured under the normal combustion condition of an internal combustion engine.

Description

technical field [0001] The invention belongs to the testing field of internal combustion engines, and in particular relates to an active sealing device used in a friction force measurement system between a piston ring and a cylinder liner. Background technique [0002] At present, oil resources are becoming more and more scarce, and the corresponding fuel consumption regulations are becoming stricter. How to reduce the fuel consumption of internal combustion engines has become an important work. By reducing the friction loss of the internal combustion engine is a commonly used energy-saving improvement technology of the internal combustion engine. Generally speaking, 40% to 50% of the internal combustion engine friction loss is consumed by the piston ring-cylinder liner friction pair. In order to measure and analyze the friction and lubrication between the piston-cylinder liner assembly, researchers have made a lot of attempts to develop a test device that can measure the ...

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Problems solved by technology

[0003] The object of the present invention is to provide an active sealing device for the friction force measurement system between the piston ring and the cylinder liner, so as to solve the sealing problem of the floating cylinder liner in the compression and power stroke of the internal combustion engine

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