Oil injection rule online measurement system suitable for multi-injection strategy of diesel engine fuel oil system and online measurement method thereof

Abstract

The invention discloses an oil injection rule online measurement system suitable for a multi-injection strategy of a diesel engine fuel oil system and an online measurement method thereof. The online measurement method comprises the steps of S1, collecting water hammer pressure signals of an oil inlet of an oil injector through an experimental device; S2, calculating the sound velocity of fuel oil based on the water hammer pressure signals of the oil inlet of the oil injector in the S1 and a pressure wave reflection principle; S3, simulating the pressure oscillation of a pre-spraying water hammer based on the sound velocity of the fuel oil in theS2 and a liquid-electricity simulation method to obtain oscillation simulation signals of the pre-spraying water hammer; S4, decoupling the water hammer pressure signals measured in the S1 based on the pressure oscillation simulation signals of the pre-spraying water hammer in the S3 to obtain fuel oil pressure fluctuation signals generated in the main spraying process; and S5, calculating a fuel oil injection rule based on the decoupled fuel oil pressure fluctuation signals in the S4 to achieve oil injection rule online measurement. The online measurement method aims to solve the bottleneck problem that the accurate control of the fuel oil injection process needs to be solved in the multi-injection process.

Description

technical field [0001] The invention belongs to the field of diesel engine fuel system testing and control, and in particular relates to an on-line measurement method of fuel injection rules applicable to multiple injection strategies of the diesel engine fuel system and the on-line measurement method. Background technique [0002] With the increasingly severe energy crisis and environmental problems, diesel engines are gradually developing in the direction of intelligence, greenness and high efficiency. The combustion quality of a diesel engine is determined by the fuel injection process and the degree of oil-air mixing, which is a typical diffusion combustion. Therefore NO x There is a trade-off relationship between carbon and soot emissions. Most of the current advanced control strategies and new combustion concepts are dedicated to improving the power and economy of diesel engines while achieving a compromise between the two. [0003] The multiple injection strategy c...

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Problems solved by technology

[0007] The invention provides an online measurement method of fuel injection law applicable to multiple injection strategies of a diesel engine fuel system and the online measurement method thereof, aiming at the problems of fuel injection quantity fluctuation and distortion of fuel injection law in the process of multiple injections, and avoiding the problem of fuel injection complex offline calibration process

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