Energy efficiency analyses of a vehicle in modal and transient driving cycles including longitudinal and vertical dynamics

Abstract

The growing concerns about the environmental issues caused by vehicles and a strive for better fuel economy, urge the legislators to introduce conservative regulations on vehicle testing and homologation procedures. To have accurate evaluations, driving cycles that can sufficiently describe the vehicles' conditions experienced during driving is a prerequisite. In current driving cycles there are still some issues which are disregarded. The aim of the presented work is to study the contribution of chassis and vehicle dynamics settings on tyre rolling loss in comparison with the original assumptions made in the NEDC, FTP and HWFET driving cycles. A half-car model including a semi-physical explicit tyre model to simulate the rolling loss is proposed. For the chosen vehicle and tyre characteristics, depending on the specific chassis settings and considered driving cycle, considerable difference up to 7% was observed between the energy consumption of the proposed-and conventional approach. The current work aims to provide the legislators with a better insight into the real effects of chassis and vehicle dynamics during the certification process to further improve the test related procedures required for homologation such as generation of road load curves. I.e., the aim is not to provide a new homologation process, since there are also other effects such as road roughness and tyre temperature that need to be considered. The results are also of interest for the vehicle manufacturers for further considerations during test preparation as well as in the development phase in order to reduce the environmental impacts.

Weighted multiple model control system for the stable steering performance of distributed drive electric vehicle

“…All of tyre lateral force F yi , i = f , r are described as the function of the tyre sideslip angle i and relevant cornering stiffness C i [20]. Additionally, the tyre longitudinal and vertical stabilities have been already investigated [21]. The tyre lateral stability is introduced as follows: The sideslip angles of two front/rear tyres are equal to each other.…”

Simulation of 8x8 Heavy Duty Truck for Evaluating Effects of Torque Converter Characteristics on Vehicle Performance

“…Torque converter assembly is composed of three major components [10]. Impeller is the input element of converter which is attached directly to the engine and turns at engine speed.…”

“…Speed and moment requirements of automatic gearbox components such as sun gear and pinion gear are determined the analysis either. Energy efficiency analyses of a vehicle was simulated [10] by using powertrain model for all system according to vehicle velocity profile named drive cycle. Tao et al [11] focused on automatic transmission model and applied evaluation models for heavy duty vehicle performance.…”

“…8x8 heavy duty truck has two power module at the rear side of vehicle including diesel engine, hydrodynamic torque converter and automatic transmission. The hydrodynamic torque converter is a major component among of all which affects driving performance [10]. Required power is transferred from engines to transmissions and engine torque is also increased by torque converter.…”

“…Drive cycles can be utilized to predict vehicle performance, fuel consumption and exhaust emissions. New European Drive Cycle (NEDC), Urban Dynamometer Driving Schedule (UDDS) and Federal Test Procedure (FTP-75) are used as standard drive cycle for reaching and testing legislative boundaries about vehicle design [10,5]. Heavy Duty Urban Dynamometer Driving Schedule (HD-UDDS) is developed for heavy duty vehicles.…”