High-efficiency and low-emission novel composite thermodynamic cycle control method for engine

Abstract

The invention discloses a high-efficiency and low-emission novel composite thermodynamic cycle control method for an engine. The control method comprises the following steps that: (1) a control unit respectively reads a rotating speed signal of a sensor arranged on an engine crank and an engine load signal of a sensor arranged on an accelerator pedal and judges a load and a rotating speed working condition during running of the engine according to the rotating speed signal and the engine load signal; (2) if the rotating speed working condition is a low-mid rotating speed working condition, the control unit sends a switch off signal to an electric control bypass valve arranged on an engine exhaust bypass pipe, and a medium-pressure grade waste gas recycling valve and a low-pressure grade waste gas recycling valve are opened; and (3) if the rotating speed working condition is a high rotating speed working condition, the control unit sends a switch on signal to the electric control bypass valve arranged on the engine exhaust bypass pipe. By the method, the boosting power and the low speed torque of the engine are greatly improved.

Description

Technical field [0001] The invention relates to the field of internal combustion engines, and in particular to a control method of a novel composite thermal cycle with high efficiency and low emission of an engine. Background technique [0002] The internal combustion engine is the main source of power for transportation, engineering and agricultural machinery. The internal combustion engine consumes more than 60% of my country's total oil consumption. In 2011, my country's dependence on foreign crude oil reached 56.5%. Through technological innovation, greatly improving the thermal efficiency of internal combustion engines is a major requirement for ensuring national energy security. At the same time, the CO caused by human activities 2 In terms of emissions, transportation powered by internal combustion engines accounts for 25%. Improving the thermal efficiency of internal combustion engines is reducing CO 2 One of the main battlefields of emissions. At present, the share of ...

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Problems solved by technology

[0005] However, a new technical bottleneck has been encountered in the research of advanced "homogeneous compression ignition and low temperature combustion" technology at home and abroad, that is, five contradictions that are difficult to coordinate appear under high engine speed, high load, and high power density. , that is, the contradiction between high charge pressure and engine strength, the contradiction between limited mixing time and soot suppression, the contradiction between low oxygen concentration (high EGR rate) and low oxygen content, the contradiction between low chemical reaction rate and high thermal efficiency, the contradiction between thermal efficiency and Harmful emissions control paradox

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