Fuel injection device for cooling engine piston, engine and fuel injection control method

Abstract

The invention relates to an oil injection device for cooling engine pistons, an engine and an oil injection control method. The oil injection device includes a main oil passage, an auxiliary oil passage, a piston cooling nozzle oil passage, a piston cooling nozzle and a controller, and the main oil passage It is connected with the oil pump of the engine, the auxiliary oil passage is connected with the main oil passage, and there are multiple piston cooling nozzles, each piston cooling nozzle corresponds to a cylinder hole in the engine, and the gap between each piston cooling nozzle and the auxiliary oil passage They are respectively connected through a piston cooling nozzle oil passage; each piston cooling nozzle oil passage is provided with a piston cooling nozzle solenoid valve, and each piston cooling nozzle solenoid valve is respectively connected to the controller, and is connected to the engine coolant temperature sensor, Crankshaft position sensor, camshaft position sensor correlation control. The fuel injection device of the present invention can realize independent and accurate control of the fuel injection cooling of each cylinder piston, and is associated with the state of the engine and the state of the corresponding cylinder.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to an oil injection device for cooling engine pistons, an engine and an oil injection control method. Background technique [0002] In response to the national requirements for energy conservation and emission reduction, the automobile industry vigorously promotes engine fuel consumption improvement technologies, including engine miniaturization and supercharging technology, variable cylinder technology, variable displacement oil pump and other friction reduction technologies. [0003] With a miniaturized engine, in order to ensure the power of the vehicle, supercharging technology is required to ensure sufficient intake air. But the exhaust gas turbo will make the intake air temperature rise, making the intake air volume lower than expected. [0004] In order to improve the utilization rate of gas heat, it is necessary to reduce the heat transfer to the relevant components of the ...

AI Technical Summary

Problems solved by technology

The disadvantage of this technology is that the opening or closing of the piston cooling nozzles only depends on the overall working conditions of the engine (speed, load, etc.), and it is impossible to further finely control whether the pistons of each cylinder are cooled at different times under the overall working conditions; The opening or closing of the piston cooling nozzle cannot be independently controlled for each cylinder. When the engine is closed, the piston of the non-working cylinder does not need to be cooled, which is not conducive to reducing the amount of oil used, the displacement of the oil pump and the reduction of power loss.

The disadvantage of this technology is: the opening or closing of the piston cooling nozzle is not related to the overall working conditions of the engine, resulting in a large amount of oil consumption under no cooling conditions, high energy consumption of the oil pump, and heat loss in the combustion chamber, etc.; piston cooling The opening of the nozzle is only limited when the piston is near the bottom dead center, and it cannot realize the cooling of the piston at the beginning of the intake stroke and the end of the compression stroke (the piston is near the top dead center), which is not conducive to reducing the temperature of the fresh air mixture in the combustion chamber

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