Electronic control diesel-methanol dual-fuel engine control system and method based on EGR technology

Abstract

The invention discloses an electronic control diesel-methanol dual-fuel engine control system and method based on the EGR technology and relates to the field of internal combustion engines. The electronic control diesel-methanol dual-fuel engine control system comprises an air inlet system, an air discharging system, an EGR system, a diesel supplying system and a methanol supplying system. The airinlet system is used for providing fresh air for an engine. The EGR system is used for leading waste gas obtained after combustion into an air inlet manifold. The diesel supplying system is used forproviding the fuel diesel. The methanol supplying system is used for providing the fuel methanol, and the methanol is sprayed into the air inlet manifold. The control system comprises a diesel ECU, amethanol ECU, a sensor and CAN communication, the two ECUs share signals in real time through the CAN communication, the methanol supplying amount and the diesel supplying amount are adjusted in a linked manner, and therefore mode and work condition stable transition can be achieved. By means of the electronic control diesel-methanol dual-fuel engine control system and method based on the EGR technology, high-temperature waste gas is used for accelerating vaporization of the methanol, the quality of the methanol mixed gas is improved, the temperature and the pressure rise rate in a cylinder are controlled, NOx discharging and detonating are inhibited, and finally clean and efficient combustion of the double-fuel engine is achieved.

Description

technical field [0001] The invention belongs to the field of dual-fuel internal combustion engines, and in particular relates to a control system and method for an electronically controlled diesel-methanol dual-fuel engine based on EGR technology. Background technique [0002] The increasing consumption of fossil energy and worsening environmental pollution have become two major problems facing the development of the internal combustion engine industry. The development and utilization of alternative fuels is not only an important measure to alleviate the oil crisis, but also has great potential to reduce pollutant emissions. As an alternative fuel, methanol has the characteristics of high octane number, high oxygen content, and high latent heat of vaporization, and has great potential for application in internal combustion engines; It often enters the cylinder in a liquid state, which will dilute the lubricating oil and reduce the temperature in the cylinder at medium and lo...

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Problems solved by technology

[0004] The object of the present invention is to provide an electronically controlled diesel-methanol dual-fuel engine control method and system based on EGR technology, aiming to solve excessive HC, CO, methanol and formaldehyde emissions and insufficient combustion caused by poor methanol atomization Causes reduced combustion efficiency and instability when switching combustion modes of conventional dual-fuel engines

[0005] The invention arranges the entrance of the EGR pipeline before the methanol nozzle, uses high-temperature exhaust gas to preheat the methanol sprayed into the intake manifold, improves the atomization quality of methanol, ensures the formation of homogeneous mixed gas after methanol enters the cylinder, and solves the problems caused by methanol The problem of high HC, CO and other emissions due to poor vaporization; the present invention adds a methanol ECU on the basis of the original diesel electronic control unit (Electronic Control Unit; ECU) to control the methanol rail pressure regulator, methanol pump, methanol nozzle, EGR valve and EGR cooler, diesel ECU control mode switch, and real-time signal sharing between methanol ECU and diesel ECU through Controller Area Network (CAN) communication, solving the problem of unstable combustion mode switching of traditional dual-fuel engines question

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