Abstract
The paper attempts to analyze full load characteristics of over 500 combustion engines. Using statistical tools, the author determined the value of the coefficient of flexibility. Engine flexibility is the capability of the engine to adapt to varying loads. Importantly, in the investigations, the author took into account the parameters calculated in the course of the investigations on a chassis dynamometer, i.e., actual, not taken from technical specifications of brand new vehicles. Different stages of operating wear allow a better characterization of the population. Subsequent utilization of the results in tractive calculations is more reliable. The engines were divided into in six groups, depending on the type of fuel system: fuel injected gasoline and turbocharged gasoline, spark ignition LPG, naturally aspirated diesel and turbocharged diesel. However, engines running on alternative fuels are characterized with a greater flexibility than the fuel injected base engines. Conformity of flexibility of fuel injected and LPG IV generation engines have been observed, which confirms the appropriateness of engine adaptation to alternative fueling. Gasoline engine supercharging allowed a reduction of the maximum engine speed of the maximum torque, which extends the range of analyzable speeds for flexibility and consequently, the flexibility as such.
Highlights
1 Introduction Yet another indicator showing vehicle tractive and operational abilities is engine flexibility coefficient E (Eq (1)) that is the factor of the torque flexibility eT and engine speed flexibility in Ref. [1]
On a chassis dynamometer we may simulate the motion resistance using the coefficient values and using the flexibility option determine the times of acceleration on selected gears
If the vehicle drives on the IV gear near the engine speed of the maximum power and if the vehicle drives onto a hill, because of the collective resistance its engine speed will drop to increase the torque and reach point 3
Summary
Another indicator showing vehicle tractive and operational abilities is engine flexibility coefficient E (Eq (1)) that is the factor of the torque flexibility eT and engine speed flexibility (range) in Ref. [1]. Another indicator showing vehicle tractive and operational abilities is engine flexibility coefficient E (Eq (1)) that is the factor of the torque flexibility eT and engine speed flexibility (range) in Ref. Full load engine characteristics can be used in many aspects, such as modeling of the vehicle in motion-performance with automatic transmission [17, 18], vehicle body behavior [19, 20], performance under different soil conditions [21], when changing lanes [22], when assessing motion stability (vehicle-driver) [23], because additional information allows a virtual diagnostic assessment in real time [24]) or a vehicle acceleration simulation [13]
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