Method for controlling valve timing of diesel engine

Abstract

The invention discloses a method for controlling valve timing of a diesel engine. The method comprises the steps of barring the engine in a preset direction with the position where a piston is on a top dead center of compression as the initial position and detecting the lifting ranges of an inlet valve and an exhaust valve in real time; acquiring a first corner, relative to the initial position, of a flywheel of the engine at the moment when the lifting range, during closing, of the inlet valve is equal to a first preset lifting range; acquiring a second corner, relative to the initial position, of the flywheel at the moment when the lifting range, during opening, of the exhaust valve is equal to a second preset lifting range; adjusting the valve clearance and / or the position of a cam of the engine according to the first corner and the second corner to enable the first corner and the second corner to conform with a first standard corner range and a second standard corner range respectively. According to the method for controlling valve timing of the diesel engine, the corners corresponding the preset lifting ranges of the valves serve as reference values of valve timing to detect whether valve timing meets requirements accurately, adjustment is carried out in a targeted mode, and then technological requirements of the valve timing are finally met.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a method for controlling valve timing of a diesel engine. Background technique [0002] As we all know, in the actual working process of a diesel engine, the opening and closing of the intake valve and the exhaust valve are not at the position where the piston is at the top dead center or the bottom dead center, but must be opened in advance and closed with a delay to achieve the maximum possible intake air. The purpose of full, exhaust as clean as possible. Use the crankshaft angle to represent the opening and closing moments of the intake valve and exhaust valve, which is called valve timing. Each type of diesel engine has its own valve timing, which are generally determined through experiments during design. Valve timing It can be represented by a valve timing diagram. [0003] At present, the detection method of valve timing in the assembly process of diesel engine includes...

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Problems solved by technology

[0006] Using the above control method, the valve timing can be obtained relatively simply. However, the above control method relies on the operator's feeling to know whether there is resistance or resistance disappears, and personal feel is different, especially for large diesel engines with relatively large valve timing. In other words, the test results of valve timing have a large deviation

[0007] In addition, for large four-stroke diesel engines, process pointers and dials cannot be installed during the assembly process. If the traditional method is forced to be tested, more process parts need to be produced, and the cost is too high

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