Online detection method and device for cyclic fuel injection quantity of engine under variable working conditions

Abstract

The invention provides an online detection method and device for cyclic fuel injection quantity of an engine under the variable working conditions. The specific values of instantaneous intake pressure and instantaneous exhaust pressure to cylinder pressure are calculated according to dynamic intake pressure, dynamic exhaust pressure and dynamic cylinder pressure, and in combination with the instantaneous flowing areas at an intake valve and an exhaust valve, the temperature of working media on the intake side and the temperature of working media on the exhaust side, the instantaneous flows of gas entering a cylinder and gas exhausted out of the cylinder are calculated; the instantaneous flows of gas entering the cylinder and gas exhausted out of the cylinder are subjected to integration, so that the quantity of accumulated gas in the cylinder is obtained when the intake valve is closed; and according to the quantity of accumulated gas in the cylinder when the intake valve is closed currently and the excess air coefficient, the cyclic fuel injection quantity is calculated. The problem that so far, the cyclic fuel injection quantity of the internal combustion engine is difficult to accurately detect online under the transient working conditions is solved, and the nuance of the air intake and fuel injection quantity of each cylinder can be detected accurately.

Description

technical field [0001] The invention relates to the technical field of internal combustion engine testing, in particular to an online detection technology of cycle fuel injection quantity under variable engine working conditions. Background technique [0002] With the rapid development of the automobile industry, the number of automobiles has also increased significantly, followed by major problems such as environmental pollution and energy shortage. Energy saving and emission reduction has become the consensus and development trend of the world. Improving the combustion efficiency and thermal power conversion efficiency of automobile engines and controlling the generation of pollutants are the most direct and effective technical solutions for automobile energy saving and emission reduction. The precise real-time monitoring and control technology of the fuel-gas mixture ratio in the actual running state of the engine is the key to energy saving and emission reduction. [00...

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Problems solved by technology

[0014] In order to solve the above-mentioned problems, the present invention proposes an online detection method of the circulating fuel injection quantity under variable engine working conditions, which can solve the problem that the prior art cannot accurately detect the circulating fuel injection quantity under the variable working conditions of the engine online

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