An engine piston cooling system

Abstract

The invention discloses a cooling system of an engine piston. The cooling system of the engine piston comprises a main engine oil passage, a secondary engine oil passage and a connecting engine oil passage, wherein a plurality of piston cooling nozzles are connected with the secondary engine oil passage, an engine oil passage blocker is arranged at the inlet of the secondary engine oil passage for cutting off communication of the connecting engine oil passage and the secondary engine oil passage, an electromagnetic valve control module is mounted at the inlet of the secondary engine oil passage on an engine cylinder, the inlet and the outlet of the electromagnetic valve control module are formed in two sides of the engine oil passage blocker respectively for controlling the on-off of an oil circuit, an electronic control unit (ECU) is connected with an engine and the electromagnetic valve control module, and controls the on-off of the electromagnetic valve control module according to load conditions of the engine so as to control whether the secondary engine oil passage can provide pressure engine oil to a piston to carry out oil injection cooling or not. According to the invention, the piston can be precisely cooled and the temperature of the piston can be controlled according to different working conditions of the engine to reduce the engine oil consumption at part load of the engine, so that the engine is more compact and lighter in weight, and then fuel consumption indexes of the whole engine and a whole vehicle are improved.

Description

technical field [0001] The invention relates to the technical field of internal combustion engine structures, in particular to an engine piston cooling system. Background technique [0002] During most of the working process of the engine, the temperature of the piston is not too high, far from reaching the temperature limit that the piston material can withstand, so it is not necessary to spray oil to cool the piston through the piston cooling nozzle at these moments. If the cooling of the piston is not precisely controlled, in the cold start stage of the engine when the piston needs to be heated up as soon as possible, the temperature of the piston cannot be raised to the optimum range as soon as possible due to the cooling of the cooling nozzle. When the speed is high, excessive high-pressure oil is consumed due to the unnecessary oil injection cooling of the piston by the piston cooling nozzle, which results in a waste of part of the work of the oil pump. When the oil s...

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Problems solved by technology

[0004] At the same time, the opening pressure value of the spring valve of the traditional spring valve piston cooling nozzle has a large tolerance range, which results in that the actual opening pressure of the spring valve exceeds the design value under the pressure condition where the fuel injection should be opened, and the opening pressure of the spring valve cannot be opened. When it is low, because the actual opening pressure of the spring valve is lower than the design value, it opens in advance, so the traditional mechanical spring valve controls the piston cooling nozzle, which cannot accurately spray and cool the piston according to the demand.

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