Diesel engine system capable of being powered by mixed DME (dimethyl ether) gas and control method

Abstract

The invention relates to a compression ignition type diesel engine system capable of being powered by mixed DME (dimethyl ether) gas and a control method. On the basis that a total body and a control system of an original engine are kept, the diesel engine system is additionally provided with a mixed fuel electronic control unit, a DME storage tank, a DME pipeline pressure sensor, a DME pipeline electromagnetic valve and a DME spray nozzle. The DME fuel electronic control unit can respectively control start and stop of a diesel spray nozzle and start and stop of the DME spray nozzle by means of receiving an original engine sensor signal and a DME gas pipeline pressure signal. The DME electronic control unit judges working conditions of the engine according to obtained rotation speed and pedal plate position signals when the DME electronic control unit is communicated with an electronic control unit of the original engine, then the DME electronic control unit transmits signals so as to respectively control a jetting time interval and a pulse width of the diesel spray nozzle of the original engine and a jetting time interval and a pulse width of the DME spray nozzle, and the compression ignition type diesel engine system realizes combustion modes including that pure DME cold start is carried out, diesel is mixed with DME under small load, pure diesel start is carried out under large load. Accordingly, HC, CO and particle emission in a cold start process of the diesel engine is greatly reduced, and thermal efficiency and emission level of the engine under a steady work condition are improved.

Description

technical field [0001] The compression ignition internal combustion engine mainly burns diesel fuel. The invention provides a compression ignition internal combustion engine in which diesel fuel is mixed with dimethyl ether (DME) gas and a control method. The specific content relates to a compression ignition engine in which DME gas is mixed in fuel. Fuel injection and supply system, fuel ratio distribution and combustion process control of internal combustion engines. Background technique [0002] The continuous reduction of petroleum resources and the increasingly serious environmental pollution have made energy saving and emission reduction an inevitable trend in the development of the internal combustion engine industry. Diesel engines are widely used in light passenger vehicles, trucks, construction machinery and other vehicles due to their good power performance. At present, diesel engines are also widely used in cars in developed countries in Europe. However, limited...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of difficult cold start at low temperature and high particle emission in current compression ignition diesel engines, the present invention provides a new type of DME-diesel mixed fuel diesel engine and its control method

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