Engine pressure balance adjusting system

Abstract

The invention discloses an engine pressure balance adjusting system and relates to the field of gasoline direct injection spark ignition engines. The engine pressure balance adjusting system comprisesan air filter, an air pump, an air storage tank, an electromagnetic valve, an engine and a sealed control cylinder. The air filter, the air pump and the air storage tank are connected sequentially. The air storage tank communicates with a third port of the electromagnetic valve. A first port and a second port of the electromagnetic valve communicate with a crankcase inner cavity and an air inletpipe correspondingly. A control piston and a piston rod connected with the control piston are arranged in the control cylinder. The control piston separates cylinder inner cavities on the two sides ofthe control piston in a sealed mode. The cylinder left cavity communicates with the crankcase inner cavity through a sixth conduit. The cylinder right cavity communicates with an air cylinder inner cavity on the upper side of the piston through a seventh conduit and an air channel. The two side walls of the control piston are elastically connected with the cylinder walls of the separately adjacent ends through springs correspondingly. A pressure adjusting valve is in series connection with a conduit connected with the air inlet pipe. According to the engine pressure balance adjusting system,the differential pressure of the upper and lower sides of the piston in an air cylinder is lowered, the gasoline downward rushing phenomenon is reduced, and the pressure of air flowing from a crankcase to the air inlet pipe is controlled by the pressure adjusting valve.

Description

technical field [0001] The invention relates to the field of direct injection engines in gasoline cylinders, in particular to an engine pressure balance adjustment system. Background technique [0002] In the current gasoline direct injection engine, the air pressure on the upper side of the piston in the cylinder changes at any time with the change of the working stroke of the engine. Especially in the compression stroke, the air pressure in the cylinder on the upper side of the piston is much greater than the air pressure in the crankcase, and the unburned gasoline injected into the cylinder will flow into the crankcase through the end clearance of the piston or the gap between the piston and the cylinder wall. As a result, gasoline is mixed into the engine oil in the crankcase, causing the oil to be polluted and the lubricating performance of the engine oil to decrease. Contents of the invention [0003] In order to solve the problem of gasoline running down, the inven...

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Problems solved by technology

[0003] In order to solve the problem of gasoline running down, the present invention provides an engine pressure balance adjustment system

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