Evaluation of energy consumption in the acceleration process of a passenger car

Abstract

The analysis of the vehicle acceleration process is a current topic based on the aspects related to the general characteristics of the car, its parameters, design, drive unit performance, and the influence of external factors. Therfore in the article, the authors assessed the dynamic and energy parameters of the car motion, in which the intensity of acceleration of the car with different intensities was examined. Acceleration was carried out in two variants, the first for a normal internal combustion engine and the second for the same engine but additionally equipped with a short-term boost system. In this way, it influences the increase in power and energy in the car drive system, changing its acceleration intensity. Variable car acceleration intensity was obtained in the range from 0.12 to 1.37 m/s2 , and energy consumption at the level of 0.4 to 1.2 MJ in the distance of 1/4 mile. The article proposes a combination of energy parameters and engine power in order to assess the acceleration dynamics, for this purpose, the specific energy consumption of the car was determined, ranging from 0.35 to 2.0 J/(kg∙m), which was related to the engine power, denoting it with the dynamics index. The study focuses on the assessment of the relationship between the specific energy consumption and acceleration of passenger cars in the available powertrain system using a new dynamics index. The proposed dynamics index combines the energy and dynamic parameters of the car to be able to objectively quantify the acceleration process.

Dynamic parameters of a car with a SI engine fueled with LPG/DME blends

“…Users take this aspect into account and consider it one of the criteria for assessing the possibility of widespread use of fuel. These types of tests approximate actual operating conditions and may also be conducted to determine fuel consumption or exhaust emissions [2,16].…”

Analysis of passenger car powertrain system measurements in road conditions

“…However, regardless of the vehicle's powertrain, the issues of its diagnostics and verification of whether its current operating parameters correspond to the original designers' assumptions remain. The powertrain's operating parameters are linked to the vehicle's dynamic properties [11,15] and often determine the choice of a particular vehicle. Modern powertrains generate higher torques than units produced a decade earlier, and the drive system's operation is controlled by sophisticated control systems.…”