Analysis of the acceleration process of a passenger vehicle under variable load conditions

The study contains an analysis of the acceleration process of a passenger vehicle equipped with an IC powertrain, aimed at determining a throttle control strategy that minimizes fuel consumption during acceleration while maintaining adequate dynamic performance. The first stage involved measuring traction parameters for a constant assumed engine power. The second stage focused on determining a control trajectory that would ensure minimal fuel consumption during acceleration. To achieve this the acceleration process was examined during a flexibility test in the speed range from 12.5 to 35 m/s, following an acceleration pedal control line related to the crankshaft rotation speed. Implementing the acceleration process along this control line resulted in a reduction in acceleration dynamics, accompanied by a decrease in fuel consumption per distance traveled by nearly 51%. An analysis of the average acceleration values for a given drivetrain gear ratio revealed that exceeding a throttle position of 70% yields no significant improvement in vehicle dynamics. The optimal throttle positions during acceleration were found to be within the range of 25% to 70%.