Study On Measurement Technology Of Transient Fuel Consumption In Idling Condition Of Marine Vessel Diesel Engine

There is no power output when fishing vessel diesel engine is in idling condition. Meanwhile,the fuel consumption is very low and a lot of fluctuations,2-4L/h on average; On the other hand,because of the low consumption, it is difficult for regular flow sensor to measure anddemonstrate,which is a blind spot for diesel engine measurement technology.To use a oval gear flow meter who can measure small flow, the minimum flow rate is1L/h.the calculation of the coefficient of the oval gear flow meter is K=0.2778mL/pulse.The Wiegandsensor selection of good response and high accuracy To cooperate with oval gear flow meter, theadvantages of oval gear flow meter measurement accuracy and Wiegand sensor characteristics canbe achieved on the micro flow measurement; To design a new kind of two five-way valve for oil,the two five-way valve used to switch measurement channels and non-measurement channel, toensure that the diesel engine is not shut down because of the flow meter get stuck when the oilconsumption meter failed; Use a regulator is used to reduce or eliminate the impact of flow meterby diesel oil return pulsating flow, the flow meter run more stable.To determine the calculation coefficient K of the flow meter,it is necessary to calibratingflow of oval gear meter,make curve linear relationship between pulse valve from flow sensor andflow and then calculate its relationship. The test on YC6A220C diesel engine was did in idlecondition, which is mainly to test the accuracy of oil consumption measurement, fuel pulsedecreasing rate and system stability, so that we can figure out whether the design and principle ofthe oil consumption measurement is right or not. The result showed that the cumulative accuracyof oil consumption meter can reach0.5when in the idling condition and instantaneous fuelconsumption undulating dramatically, The maximum error is27%.Fuel consumption meter runssmoothly. Repeatability tests show that oil consumption meter better reliability, total fuelconsumption error can reach0.5, instantaneous fuel consumption error in1200r/min conditions theaverage error is about2.2%.It is also essential to analyze the influence of oil viscosity on accuracy of fuel consumptionmeter by comparing the results of different viscosity fuel flow meter calibration, and the best choseis real used oil, some similar oil is also allowed. The relationship of the loss of flow meterImporters fuel pressure and fuel flow rate shows that the pressure loss increases with the increasein the viscosity of the fuel by analysis and comparison the calibration test. The influence of temperature on fuel viscosity, fuel meter thermal expansion and fuel thermal expansion is neededto analyze, and then calculate. Through the error analysis of pressure loss,we can get that thetemperature change is the leading cause of elliptical gear flow meter error.This article is to design a kind of device to measure the fuel consumption of the dieselengine based on the volume of oil consumption meter.It has simple structure, easy to operate and itwill play an important role in the detection and evaluation of the fuel economy of the fishing vesseloil machine.It also has a good application value.