Strategy for switching spark ignition and homogeneous compression ignition modes of dual-fuel engine, and implementation device thereof

Abstract

The invention belongs to the technical field of internal combustion engines, and relates to a strategy for switching spark ignition and homogeneous compression ignition, and an implementation device thereof. The implementation device comprises an electronic control unit, an air inlet pipe pressure temperature sensor, a gasoline oil supply system and a normal heptane oil supply system, wherein a gasoline injector, a normal heptane injector and a pressure temperature sensor are all mounted on an air inlet pipe. During process of combustion mode switching, the electronic control unit collects inlet air temperature and inlet air pressure inside an induction manifold, and determines the proportion of gasoline and normal heptane required by compression ignition under the condition; according to load requirements, the electronic control unit determines the opening degree of a throttle valve and circulating oil supply quantity; according to pre-determined circulating oil injection quantity and proportion of oil injection of two fuels, the electronic control unit is used for respectively adjusting oil injection pulse width of a gasoline injector and a normal heptane injector, so as to achieve switching from spark ignition to compression ignition under a burning mode. The implementation device provided by the invention is reasonable in design, has a simple structure, and is applicable to an engine burning mode switching system based on fuel design and management.

Description

Technical field [0001] The invention relates to a novel engine combustion mode switching control strategy and its implementation device, in particular to a gasoline-n-heptane dual-fuel engine based on a traditional gasoline engine spark ignition and homogeneous compression ignition mode switching strategy and its implementation device. Background technique [0002] With the development of modern society, people have higher and higher requirements for engine energy saving and environmental protection. Homogeneous compression ignition, as a new type of engine combustion mode, can reduce fuel consumption and greatly reduce nitrogen oxide emissions. Homogeneous compression ignition engines based on traditional gasoline engines still face problems that need to be solved urgently, such as the difficulty of cold start and the small load range. In practical applications, the working conditions of the engine are constantly changing, so it is necessary to constantly switch between the spa...

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Problems solved by technology

This method has the characteristics of high thermal efficiency and wide operating range, but due to the thermal inertia of t

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