Abstract
The paper presents the method and results of the car tractive efficiency comparative investigations. Both technical characteristics and fuel consumption values of numerous cars tested in the ECE simulated driving cycles were used as the input data. On the basis of the obtained data together with simulated tractive energy consumption the correlation between tractive efficiency and selected parameters of a vehicle were determined. The proposed method also allows indirect determination of the average engine effective efficiency of a vehicle at variable speed.
Highlights
The tractive efficiency of a vehicle is expressed by the ratio of tractive energy consumption [4] to chemical energy of the fuel supplied to the engine
The tractive efficiency is expressed by the product of the engine effective efficiency and the powertrain system efficiency which equals the ratio of power input on the drive wheels to engine effective power [4]
A specific property of the car motion in the road traffic is the variable speed described by the driving schedule, i.e. speed versus time course
Summary
The tractive efficiency of a vehicle is expressed by the ratio of tractive energy consumption [4] to chemical energy of the fuel supplied to the engine. The tractive energy consumption of a vehicle equals the value of power necessary to move wheels in order to overcome the motion resistance along a given distance [4]. The energy depends on particular properties of a vehicle and kinematic parameters of the driving schedule. The tractive efficiency is expressed by the product of the engine effective efficiency and the powertrain system efficiency which equals the ratio of power input on the drive wheels to engine effective power [4]. The speed variability of a vehicle has a significant influence on the engine effective efficiency as well as on the powertrain system efficiency. Some authors [1] use engine characteristics for stable conditions so as to determine fuel consumption at the variable speed which, in consequence, leads
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