The objective of this numerical study is to investigate the effect of CO2 mole fraction controlled by simulated-exhaust gas recirculation (EGR) on fuel droplet behavior for simultaneous exhaust emissions reduction in compression ignition engine under early injection conditions. ...
Global warming makes it necessary to reduce energy consumption, which in the case of motor vehicles, is connected, among other things, with reduction of resistive forces acting on a vehicle during its motion. One of the most important components of those forces is rolling resist...
A dynamic friction coefficient model in engagement was established based on the friction transmission mechanism of a wet clutch. The effects of parameters, such as the material permeability, surface roughness, Young’s modulus, ATF viscosity, applied pressure, initial relative a...
The development of commercial vehicle technology is strongly influenced by the trends of new drives and automation. In order to develop new drive train concepts and associated operating strategies, a simulation methodology was created. It includes among others a high-level contr...
A novel compound power-split hybrid power system based on two planetary gear sets for commercial vehicles is developed. The equivalent lever diagram is used to investigate the components speed and torque characteristics of the system, and then the system dynamic torque control a...
The effects of intake pressures and EGR rates on the natural gas/diesel dual-fuel combustion under a high load condition (brake power of 100 kW) were evaluated using a 6-L CI engine in this study. Natural gas fraction was fixed as 80 % of total input energy for all the dual-fuel...
The paper focuses on experimental approaches for selected mechanical coupling components to type-approval. The obtained results have enabled to present behaviour of the following tested objects: ball (with homologation certificate), transport platform, and rigid drawbars under c...
Wet clutch systems are widely used in modern automobile systems including clutch packs in automatic transmissions, other take-off devices in hybrid powertrains, and 4 WD couplings in drivelines. The torque transfer performance of clutch pads is correlated to the friction abruptl...
A total of 96 tests were conducted using a driving simulator with six male volunteers. The driving simulator produced a series of 4.8-second cycle motions that combines roll (Rx) and sway (Dy). The cycle motions were produced in four levels of intensity by linearly adjusting the...
With the different physiological properties and thermal conditions, different body parts of passengers have inconsistent thermal sensations and thermal requirements in a highly non-uniform and transient vehicle cabin thermal environment. Determining the thermal comfort requireme...
This study was conducted focusing on AIS (Amplified Ignition Source) technology to increase the usability of LFG (Land Fill Gas) for SI (Spark Ignition) currently being used. To simulate the LFG combustion environment, experiment was conducted by changing the LFG chemical compos...
Various types of emission-reducing systems or waste heat recovery systems installed on exhaust pipes of internal combustion engines are a source of high exhaust gas backpressure. Increased backpressure can cause negative impacts on the performance of internal combustion engines....
The design process of chassis systems is considerably difficult because of the complexity caused by numerous design variables and extreme nonlinearity. To address these problems, this study proposes a modular architecture design process for chassis systems. First, a chassis syst...
The purpose of this study was to develop a one-dimensional (1-D) model for predicting the amount of unburned hydrocarbons (UHC) due to flame extinction by quenching close to the combustion chamber wall in a gasoline engine. The local Reynolds number was used to predict the thick...
Wear and deformation occur in the body seat of diesel fuel injector nozzles, thereby affecting fuel spray behaviors and injection characteristics. In this study, the effects of body seat temperature, test duration, temperature increase duration, tempering temperature, and temper...
In recent years, EVs have attracted considerable attention as eco-friendly vehicles. Owing to a significant decrease in fuel economy during the winter season, heat pump technology is currently being applied for EVs in lieu of the standard electric heater option. However, heat pu...
Lean-diluted combustion can enhance thermal efficiency and reduce exhaust gas emissions from spark-ignited (SI) gasoline engines. However, excessive lean mixture with external dilution leads to combustion instability due to high cycle-to-cycle variations (CCV). The CCV should be...
ABSTRACT–Forged parts made of cold heading quality wire materials are used for automotive brake systems. In general, forged parts are limited in weight reduction due to strict configuration management, and thus cost reduction in the manufacturing process is a significant topic....
Adopting back-disk impingement cooling is an effective way to cool small radial turbines. The circumferential uneven flow field caused by the volute leads to an uneven distribution of cooling efficiency on the back disk. To improve the uneven distribution, the arrangement of imp...
Active suspension systems can improve ride comfort and driving safety. However, conventional active suspension systems have high energy consumption because of continuous actuator operation. This study proposes a continuous damping control (CDC)-based high-efficiency active suspe...
A hierarchical vehicle collision avoidance control method based on model predictive control is presented in this study. In the upper level of the controller, a spatial-based two-degree-of-freedom vehicle model is used for dynamic path planning to decrease the computational burde...
The paper presents design of a disc-on-disc-type CNC (Computer Numerical Control) tribometer aimed at
experimental characterization of friction and wear behaviors of automotive dry clutches. The torque or normal force, slip
speed, friction interface temperature, and closing ti...
Vehicle driving stability is the basis of chassis integrated control and automatic driving. In this paper, we construct an 18 degrees of freedom (DOF) unified dynamics model of vehicle chassis. The unified dynamics model includes three subsystems: steering subsystem, brake subsy...
This study investigates the performance of vehicle cabin supplemental cooling and heating systems equipped with a 1 kW thermoelectric module (TEM) heat exchanger. The TEM heat exchanger comprises 96 thermoelectric modules, the heat sink with a louver fin and water cooling jacket...
This paper deals with the static, impact, and dynamic strength of reduction gears applied to a shift-by-wire (SBW) actuator system. A sintered material (FD-0405-60) was used for cost competitiveness and mass production. Therefore, strength verification is essential at the beginn...
