Engine parameter correction method and engine

Abstract

The invention belongs to the technical field of engines, and discloses an engine parameter correction method and an engine, and the engine parameter correction method comprises the following steps: S1, according to an abrasion loss MAP table of a valve mechanism, calculating to obtain an accumulated abrasion loss of the valve mechanism under an actual working condition; s2, according to the accumulative abrasion loss, the actual valve timing phase change amount is calculated; and S3, according to the fuel injection advance angle correction coefficient MAP table, the fuel injection quantity correction coefficient MAP table and the urea injection quantity correction coefficient MAP table, the actual gas distribution phase change amount is input, the fuel injection advance angle correction coefficient, the fuel injection quantity correction coefficient and the urea injection quantity correction coefficient are obtained through table look-up, and the nozzle advance angle, the fuel injection quantity and the urea injection quantity are corrected. According to the engine parameter correction method, the actual valve timing change quantity of the valve timing mechanism is obtained by calculating the accumulated abrasion loss of the valve timing mechanism of the engine, then the parameters such as the fuel injection advance angle, the fuel injection quantity and the urea injection quantity of the engine are optimized, and the performance and emission indexes of the engine are optimized.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to an engine parameter correction method and an engine. Background technique [0002] The valve mechanism of the engine includes camshafts, tappets, pushrods, rocker arms, rocker shafts, valve springs, intake valves, exhaust valves, and valve guides. The gas distribution mechanism opens and closes the intake and exhaust valves of each cylinder regularly according to the requirements of the working cycle and ignition sequence in each cylinder of the engine, so that fresh combustible mixture or air can enter the cylinder in time, and the exhaust gas can be discharged in time. discharge from the cylinder. The valve timing is the opening and closing time and opening duration of the intake and exhaust valves represented by the crankshaft angle. The wear of the valve mechanism during operation leads to changes in the valve timing, which affects the parameters such as the engine's fuel i...

AI Technical Summary

Problems solved by technology

The wear of the valve mechanism during operation leads to changes in the valve timing, which affects the parameters such as the engine's fuel injection advance angle, fuel injection volume, and urea injection volume, resulting in the actual fuel injection advance angle, fuel injection volume, and The amount of urea injection is different from the preset value, which affects the performance and emission indicators of the engine

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