Gas exhaust valve drive system with stroke capable of being compensated and regulated

Abstract

The invention discloses a gas exhaust valve drive system with stroke capable of being compensated and regulated. The gas exhaust valve drive system comprises a low-voltage servo drive oil supply device, a stroke compensating and regulating module, a high-voltage common rail unit, a control implementation unit, a gas exhaust valve and a drive device thereof, wherein the stroke of a valve rod of the gas exhaust valve is adjustable; oil supply pressure of the low-voltage servo drive oil supply device can be flexibly regulated according to needs by virtue of a pressure compensating valve; the stroke compensating and regulating module is used for flexibly regulating the valve rod stoke and keeping the valve rod stroke at a required position according to a valve rod displacement or air cylinder pressure feedback signal; meanwhile, valve rod closing buffer time is flexibly regulated by virtue of a variable throttle at an outlet of a proportional flow valve, so that impact force when the valve rod is dropped is reduced; and opening and closing of the valve rod are controlled by the high-voltage common rail unit and the control implementation unit. According to the gas exhaust valve drive system, flexible adjustment of valve rod stroke, opening, buffering and closing time is realized, impact force when the valve rod is dropped is effectively reduced, control freedom of a diesel engine gas exhaust system is improved, gas exhaust consistency of each cylinder is improved, and the service life of the system is prolonged, and therefore, the gas exhaust valve drive system is suitable for internal combustion engines with different cylinder diameters, different performances and different exhaust needs.

Description

technical field [0001] The invention relates to an electro-hydraulic control type exhaust valve stroke compensation adjustment driving system, in particular to a marine high-power low-speed diesel engine exhaust valve control and adjustment driving system, which belongs to the technical field of diesel engines. Background technique [0002] The exhaust valve and its control driving system of marine low-speed diesel engine are one of the core components of the diesel engine. to directly affect. The exhaust advance angle, exhaust duration, and the opening and closing speed of the exhaust valve during the exhaust process all have a crucial impact on the quality of the air exchange. An exhaust mechanism with a large degree of control freedom and high reliability is of great significance to ensure good working performance and service life of a diesel engine. [0003] The electro-hydraulic control exhaust valve drive system widely used at present works on the same principle: whe...

AI Technical Summary

Problems solved by technology

The volume of the pressurized chamber in this type of system is fixed, the stroke of the valve stem cannot be adjusted according to the requirements of different working conditions, the degree of freedom of exhaust control is small, and due to the differences in system processing, assembly and system operation, the exhaust gas cannot be guaranteed. The air valve reaches the design stroke or makes each cylinder and each cycle have a consistent stroke, resulting in different air exchange quality of each cylinder of the diesel engine under each working condition, thus affecting the performance of the diesel engine

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