Chapter 10 Engine working conditions and features Section 3 Load feature 1.1 Curve of fuel consumption rate 22 Fuel consumption rate and indicated nconst efficiency,mechanical efficiency is inversely 20 520 1700 proportional relationship.Therefore,as indicated 18 480 6.50 efficiency and mechanical efficiency increase, 16 440 fuel consumption rate decreases 14 400 550 1.2 Curve of fuel consumption per 12 360 500 hour 450 320 400 280 350 240 J300 102004006070Ps P(kW) Figure 10.8 The relationship of gasoline engine ninm with Figure 10.7 Load features of gasoline engine the load change 业机械与电子工收学原 Automobile and Tractor Northwest A&F University
Automobile and Tractor Northwest A&F University Chapter 10 Engine working conditions and features 1.1 Curve of fuel consumption rate Fuel consumption rate and indicated efficiency, mechanical efficiency is inversely proportional relationship. Therefore, as indicated efficiency and mechanical efficiency increase, fuel consumption rate decreases. 1.2 Curve of fuel consumption per hour Figure 10.7 Load features of gasoline engine Section 3 Load feature
Chapter 10 Engine working conditions and features Section 3 Load feature 2.Load Feature of Diesel Engine Under the condition of a certain engine rotational speed,the relationship of fuel consumption per hour,effective fuel consumption rate with the changes of the load is known as the load feature of diesel engine. Under the conditions of certain rotational speed and the same amount of air entering the cylinder,the corresponding change of the change in load is the fuel supply per cycle,so that the mixture composition changes. Diesel engine adapts to changes in the load by changing the composition of the mixture,and the method of load adjustment is called"quality adjustment." 2.1 Curve of fuel consumption rate Fuel consumption rate and indicated efficiency,mechanical efficiency is inversely proportional relationship. Being different from the gasoline engine, P as the load increases,indicated efficiency Figure 10.9 The relationship of diesel decreases very quickly. engine ni nm with the load change 机械电子工程学度 Automobile and Tractor Northwest A&F University
Automobile and Tractor Northwest A&F University Chapter 10 Engine working conditions and features 2. Load Feature of Diesel Engine Under the condition of a certain engine rotational speed, the relationship of fuel consumption per hour, effective fuel consumption rate with the changes of the load is known as the load feature of diesel engine. Under the conditions of certain rotational speed and the same amount of air entering the cylinder, the corresponding change of the change in load is the fuel supply per cycle，so that the mixture composition changes. Diesel engine adapts to changes in the load by changing the composition of the mixture, and the method of load adjustment is called "quality adjustment." 2.1 Curve of fuel consumption rate Fuel consumption rate and indicated efficiency, mechanical efficiency is inversely proportionalrelationship. Being different from the gasoline engine， as the load increases, indicated efficiency decreases very quickly. Figure 10.9 The relationship of diesel engine ηi 、ηm with the load change Section 3 Load feature
Chapter 10 Engine working conditions and features Section 3 Load feature Curve of fuel consumption rate analysis. 360 ☑600 2.2 Curve of fuel consumption 800 r/min 500⊙ per hour 340 25 200 r/min- 400 300 240 When rotational speed is constant, fuel consumption mainly depends on the 立230 amount of circulating oil supply. 300 Load and the amount of circulating 210 24 280 oil supply increase,increased fuel 200 220 consumption is proportional. 260 When the load increases to point 2, 6 14 combustion will deteriorate and fuel 240 180 12 1800rmin)】 consumption increases faster. 2204 170200mn 20406080100120140160P(PS) 20406080100120 P(kW) Figure 10.10 6135Q Load feature of diesel engine 业机械电子工程学原 Automobile and Tractor Northwest A&F University
Automobile and Tractor Northwest A&F University Chapter 10 Engine working conditions and features Curve of fuel consumption rate analysis. 2.2 Curve of fuel consumption per hour When rotational speed is constant, fuel consumption mainly depends on the amount of circulating oil supply. Load and the amount of circulating oil supply increase, increased fuel consumption is proportional. When the load increases to point 2, combustion will deteriorate and fuel consumption increases faster. Figure 10.10 6135Q Load feature of diesel engine Section 3 Load feature