Cold-start and small-load combustion control system and method for low-temperature combustion engine

Abstract

The invention relates to a cold-start and small-load combustion control system and method for a low-temperature combustion engine. The cold-start and small-load combustion control method for the low-temperature combustion engine comprises the steps that a control system which comprises cylinder pressure detection glow plugs, oil nozzles, common rail systems, batteries, engine electric-control units, glow plug control units and combustion state analysis units which are arranged in four air cylinders of an internal combustion engine correspondingly is arranged; the operating state information of the engine is detected, and the operating state information includes the temperature of the engine, the temperature of cooling liquid, the air inlet temperature, the air inlet pressure, the rotating speed of the engine, the torque of the engine, the torque required by a driver and the environment temperature and pressure; whether the engine is in a cold-start state or not currently is judged, and cold-start control is conducted if it is judged that the engine is in a cold-start state; the next step is executed if the engine is not in the cold-start state; whether the engine is under a small load working condition or not is judged, and small-load combustion assisting control is conducted if the engine is under the small load working condition; and otherwise, heating through the glow plugs and intervention of a low-pressure spraying method are not needed. The cold-start and small-load combustion control system and method for the low-temperature combustion engine can be widely applied to various electric-control diesel engines and electric-control gasoline engines.

Description

technical field [0001] The invention relates to a low-temperature combustion control system and method for an engine, in particular to a low-temperature combustion engine cold start and small-load combustion control system and method applied in the engine field. Background technique [0002] Low-temperature combustion is a new engine combustion mode, which avoids high temperature and reduces NOx emissions by diluting the mixture; reduces particulate matter emissions through lean combustion. At the same time, thanks to its direct injection and compression ignition characteristics, it can obtain relatively high combustion efficiency. When the engine is running under medium and high loads, it can achieve relatively stable low-temperature combustion. However, under light load conditions, due to the overall high air-fuel ratio and the heat transfer loss of the cylinder wall, the combustion stability becomes poor. For gasoline or fuel with a high gasoline blending ratio, it is d...

AI Technical Summary

Problems solved by technology

However, under light load conditions, due to the overall high air-fuel ratio and the heat transfer loss of the cylinder wall, the combustion stability becomes poor.

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