Combustion system and control method of lean-burn natural gas engine based on ring electrode

Abstract

The invention discloses a lean-burn natural gas engine combustion system based on an annular electrode and a control method. The control method comprises the steps of enabling the working condition of an engine to change during a running process; regulating the opening of a throttle valve by an ECU (Electronic Control Unit) according to a feedback value of a revolution speed sensor so as to stabilize the revolution speed; controlling the natural gas injection amount of a natural gas injection module by the ECU according to a MAP which is calibrated in advance, and regulating according to a feedback value of an exhaust gas oxygen sensor; controlling the voltage and the frequency of an alternating current power supply through an alternating current power supply control module by the ECU according to the MAP which is calibrated in advance; accurately controlling the voltage and the frequency of an electric field power supply through the alternating current control module by the ECU according the air inlet temperature and excess air coefficients fed back by a pressure sensor, the revolution sensor and the exhaust gas oxygen sensor. According to the lean-burn natural gas engine combustion system and the control method, disclosed by the invention, the lean-burn limit of a natural gas engine can be expanded, the flame propagation speed is increased, the efficiency of the engine is increased, and the emission is reduced.

Description

technical field [0001] The invention relates to the field of engines, in particular to a combustion system and control method of a lean-burn natural gas engine based on an annular electrode. Background technique [0002] Global warming and energy shortage have made natural gas, as an abundant, efficient and clean fuel, attract more and more attention. With the increasingly stringent emission regulations, the development of efficient and clean combustion technology for natural gas engines has become one of the focuses of natural gas application technology in the world today. [0003] At present, lean combustion is considered to be an effective measure to reduce the emission of natural gas engines. However, since the flame propagation velocity of natural gas combustion is much lower than that of diesel engines, especially when the excess air coefficient is greater than 1.8, the laminar flame propagation velocity of natural gas is extremely slow, which can easily lead to Combu...

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Problems solved by technology

[0003] At present, lean combustion is considered to be an effective measure to reduce the emission of natural gas engines. However, since the flame propagation velocity of natural gas combustion is much lower than that of diesel engines, especially when the excess air coefficient is greater than 1.8, the laminar flame propagation velocity of natural gas is extremely slow, which can easily lead to Unstable combustion

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