Methanol feeding system of methanol/diesel dual-fuel engine

Abstract

The invention relates to the field of dual-fuel engines, in particular to a methanol feeding system of a methanol / diesel dual-fuel engine. A methanol rail is fixedly connected with an engine air inlet pipe through a methanol rail support, air inlet branch pipes of cylinders are arranged on the engine air inlet pipe and provided with electric spray valve connecting seats, the electric spray valve connecting seats are connected with methanol electric spray valves, and the methanol electric spray valves communicate with the methanol inlet branch pipes of the methanol rail. When a controller detects that the pressure and the temperature of methanol in the methanol rail reach set values, the methanol electric spray valves are controlled to spray methanol on the air inlet branch pipes of the cylinders of the engine in a timing and quantifying mode according to the ignition sequence after an engine exhaust valve is closed. The design meets the multi-point spraying requirement of the dual-fuel engine, and pressurized air and methanol are mixed in the air inlet branch pipes of the cylinders to form homogeneous mixed gas, and then the homogeneous mixed gas enters the engine. Through timing and quantifying multi-point sequential spraying control, waste of engine fuel is reduced, the heat efficiency of the engine is improved, emission of the engine is optimized, and a big step is made towards the environment-friendly engine.

Description

technical field [0001] The invention relates to the field of dual-fuel engines, in particular to an alcohol feeding system for a methanol / diesel dual-fuel engine. Background technique [0002] Alcohol fuel for dual-fuel engines is supplied to the alcohol rail of the engine through an external methanol pump to establish rail pressure. The methanol EFI valve connects each branch pipe of the alcohol rail with the upper socket of each air intake branch pipe of the engine. The opening and closing of each methanol electric injection valve is controlled by the engine ECU, and the methanol fuel enters the combustion chamber through the intake branch pipe of each cylinder of the engine along with the engine intake air. Methanol fuel forms a homogeneous mixture of methanol and air with air in the combustion chamber of the engine, thereby realizing the purpose of blending methanol with the diesel engine through the "quasi-internal mixing" method. [0003] The raw materials for meth...

AI Technical Summary

Problems solved by technology

This design has a simple structure and achieves the purpose of blending methanol with the diesel engine, but this design cannot avoid the overlapping angle of the intake and exhaust of the diesel engine, causing a part of the fuel to be discharged with the engine scavenging, and this part of the discharge is directly discharged into the exhaust pipe without doing work. Causes fuel waste, reduces engine thermal efficiency, and worsens engine emissions

In addition, part of the fuel burns in the exhaust pipe, causing adverse effects such as high engine exhaust temperature.

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