Internal combustion engine operated according to premixed charge compression ignition mode

Abstract

A premixed charge compression ignition engine, and a control system, is provided which effectively initiates combustion by compression ignition and maintains stable combustion while achieving extremely low oxides of nitrogen emissions, good overall efficiency and acceptable combustion noise and cylinder pressures. The present engine and control system effectively controls the combustion history, that is, the time at which combustion occurs, the rate of combustion, the duration of combustion and / or the completeness of combustion, by controlling the operation of certain control variables providing temperature control, pressure control, control of the mixture's autoignition properties and equivalence ratio control. The combustion control system provides active feedback control of the combustion event and includes a sensor, e.g. pressure sensor, for detecting an engine operating condition indicative of the combustion history, e.g. the start of combustion, and generating an associated engine operating condition signal. A processor receives the signal and generates control signals based on the engine operating condition signal for controlling various engine components to control the temperature, pressure, equivalence ratio and / or autoignition properties so as to variably control the combustion history of future combustion events to achieve stable, low emission combustion in each cylinder and combustion balancing between the cylinders.

Description

Technical field [0001] In a broad sense, the present invention relates to a compression ignition engine, which is arranged to facilitate internal combustion of a fuel-air premixed charge by auto-ignition, thereby reducing various emission indicators while maintaining ideal fuel economy. Background technique [0002] For more than 75 years, the internal combustion engine has been the main driving force used by mankind. Any evaluation of its importance and the efforts of humans in engineering to improve its performance cannot be overstated. Therefore, it is well understood for everyone that in the field of internal combustion engine technology, various so-called "new" engine designs are simply the result of selection from various known alternative designs. For example, an improved output torque curve can be easily obtained by sacrificing the fuel economy of the engine. Improvements in emissions or reliability can also be achieved by increasing the cost of the...

AI Technical Summary

Problems solved by technology

Therefore, it is impossible for this engine to provide effective active combustion control to ensure efficient combustion under all operating conditions with low emissions

Furthermore, compression ratio is only adjusted manually, without automatic temperature, equivalence ratio and / or auto-ignition performance control it will not be possible to produce stable, optimized combustion under all operating conditions

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