Air intake and exhaust thermal control device and method for implementing HCCI (homogeneous charge compression ignition) combustion of gasoline engine

Abstract

The invention discloses an air intake and exhaust thermal control system for implementing HCCI (homogeneous charge compression ignition) combustion of a gasoline engine. The system comprises an air intake pipeline, an air exhaust pipeline and an air exhaust-intake heat exchanger, wherein the heat exchanger is filled with heat storage materials; the air intake pipeline, the air exhaust pipeline and a bypass are respectively provided with an electrically operated valve; the pipelines are provided with a plurality of temperature sensors; the electrically operated valves and the temperature sensors are connected with a controller; and the controller comprises a signal conditioning circuit and a driving circuit which are connected with a singlechip and are used for implementing the thermal control of air intake and air exhaust. The device provided by the invention has the heat storage capability of the heat exchanger, reasonable storage and release of air exhaust heat can be realized. Whenthe gasoline engine operates at medium and large load, the storage and accumulation of surplus air exhaust heat in the heat exchanger can be realized, and the device is used for heating the intake air when the gasoline engine operates at low load, the problem that the air exhaust heat is insufficient to heat the intake air at low load is solved, the requirement of air exhaust-intake heat exchangeefficiency is lowered, and the device can be practically applied to the HCCI combustion of the gasoline engine.

Description

technical field [0001] The invention relates to an intake and exhaust heat control system of a gasoline engine, in particular to an intake and exhaust heat control system for realizing HCCI combustion of a gasoline engine. Background technique [0002] Homogeneous Charge Compression Ignition (HCCI) on gasoline engines has higher fuel economy and lower NO X emissions potential. In order to realize the homogeneous compression ignition combustion method of the gasoline engine, it is necessary to compress the oil-air mixture in the cylinder to a high temperature of 1000K near the compression top dead center. Under the condition of not making major changes to the engine body and maintaining the compression ratio of conventional gasoline engines, heating the intake air of the engine is a main way to realize HCCI combustion of gasoline engines. Since the exhaust gas of the engine has relatively high heat, a heat exchanger is used to realize the heat exchange between the exhaust g...

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Problems solved by technology

However, the gas-air heat exchanger itself has the disadvantage of low heat transfer efficiency. It is difficult to optimize the structural parameters of the heat exchanger to greatly improve its heat transfer efficiency. At the same time, it will also bring about negative effects such as increased airflow resistance and increased size. , such a contradiction makes it difficult for the exhaust-intake heat exchanger to be practically applied to gasoline engine HCCI combustion

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