Research and application of fuel consumption law of 220 t electric wheel dump truck

The fuel consumption of mining dump truck in open pit mine accounts for up to 1/3 of the total cost.Therefore,fuel consumption analysis is extremely important for mine to reduce cost,save energy,reduce emission and intelligentize transportation system.However,the conventional fuel consumption estimating model and fuel-burn monitoring device of mining dump trucks are not accurate enough for precise analysis,which in turn leads to the unpredictable fuel consumption and the inability to formulate fuel consumption KPI.First,a 220-ton mining electric wheel dump truck in an open pit mine was taken as the research object,and the balance analysis of the driving force and driving resistance of the dump truck was carried out.The wheel driving force can be simplified as the sum of rolling resistance,slope resistance and acceleration resistance.The balance analysis of engine power of dump truck showed that the engine power was mainly divided into rolling resistance power,slope resistance power,acceleration power,non-driving power and transmission system loss power,a fuel burn model was developed to simulate the major power output components of the engine in a working condition.Second,based on vehicle dynamics and other methods of the first-principal,an accurate formula for estimating fuel consumption of electric drive dump trucks was proposed,which can quantify the influence of load,speed,rolling resistance,and slope resistance on fuel consumption.Theoretically,the multi-dimensional characteristic parameters of fuel consumption rate of dump truck engine were load,speed,rolling resistance coefficient,slope resistance coefficient and acceleration.On this basis,in combination with the driving/electric braking performance curve,the influence pattern of load,speed,rolling resistance coefficient and slope resistance coefficient on fuel consumption rate and unit consumption of mining dump truck were quantified.Finally,an open-pit mine was taken as an example,in which a highly-precise and reliable volumetric fuel consumption sensor was introduced to verify the accuracy of the fuel consumption estimation model of mine electric drive dump trucks.The results showed that the unit consumption prediction errors of mining electric dump trucks on three main transportation lines were 4.18%,0.96% and 5.88%,respectively,which verified the model accuracy under different working conditions,and thus met the accuracy requirements of field unit consumption estimation.The research results can be applied to formulate fuel consumption assessment indicators and cost budget schemes for different haulage conditions,and to optimize the fuel consumption of truck-operations.