A Computer Code for S.I. Engine Control and Powertrain Simulation Ivan Arsie, Cesare Pianese and Gianfranco Rizzo University of Salerno Roberto Flora and Gabriele Serra Magneti Marelli. A computer code oriented to S.I. engine control and powertrain simulation is presented. The model, developed in Matlab-Simulink® environment, predicts engine and driveline states, taking into account the dynamics of air and fuel flows into the intake manifold and the transient response of crankshaft, transmission gearing and vehicle. The model, derived from the code O.D.E.C.S. for the optimal design of engine control strategies now in use at Magneti Marelli, is suitable both for simulation analysis and to achieve optimal engine control strategies for minimum consumption with constraints on exhaust emissions and driveability via mathematical programming techniques. The model is structured as an object oriented modular framework and has been tested for simulating powertrain system and control performance with respect to any given transient and control strategy. The adoption of a hierarchical structure based on different classes of models, ranging from black-box Neural Network to grey-box mean value dynamic models, allows a satisfactory accuracy with limited computational demand which makes it suitable for the optimization of engine control strategies. In the paper the whole model framework is described together with simulation results obtained for different transient manouevres and control strategies.

ABSTRACT Vehicle acceleration induced pressure spike on the high side of an Air Conditioning (AC) system is causing considerable concerns, especially for systems with high efficiency compressors. Head pressure surge in the order of one to two hundred pounds per square inch can be observed within a time span of 10 seconds or less. As the industry moves to meet increased system durability standards and passenger comfort requirements, clear understanding of the underlying mechanisms is required so that the impact of the head pressure spike can be minimized or eliminated. The present investigation seeks to understand the mechanisms of the head pressure spike phenomenon through both experimental and mathematical analyses. Experimentally, extensive testing has been conducted in environmental wind tunnel. Our mathematical analysis is based on the mass conservation principle for the refrigerant flow through the high side of an AC system. The analyses establish that the head pressure spike is primarily a phenomenon of mass balance between the refrigerant expansion device and the compressor. Consequently, all the variables in the AC system that have bearings over the mass flow rate through the compressor or the expansion device can all exert due influence on the magnitude of the head pressure spike. Based on the analysis, a number of practical measures are recommended for mitigating the head pressure spike, especially for scroll compressor AC systems. SAE Paper 2000-01-0973/Delphi

An Improved Non-Intrusive Automotive Suspension Testing Apparatus with Means to Determine the Condition of the Dampers. Anatoly Tsymberov Hunter Engineering Company Bridgeton, Missouri. ABSTRACT Suspension testing equipment has previously been designed to provide the time-domain response of the automotive suspension. The results of this type of test, although quantitative, are dependent on all suspension components, and are unreliable in determining the safety of the vehicle and condition of the dampers. Frequency domain suspension testers have also been designed; however, they have been limited to the magnitude response of the suspension system. This result, usually referred to as "road" adhesion, is indicative of the safety of the vehicle; however, it is unreliable in determining the performance of the dampers. The present apparatus provides, along with the magnitude response (adhesion), the phase response of the wheel versus the road surface irregularities. This information, including a quantity known as "minimum phase angle," gives valuable information as to the suspension damping value. EuSAMA

Project Davinci starts with a state of the art study on automated vehicle guidance concepts and all primary functions a vehicle had to fulfil within a transport environment, covering the normal vehicle functions and additional transport functions such as loading, unloading, coupling, de-coupling, positioning. That all should allow manufacturers and suppliers to develop integrated control systems in a more efficient and effective way, with guaranteed safety, reliability and optimal functionality. The study of vehicle dynamics has traditionally focused on steady-state analysis, which provided adequate design equations. Braking, turning, acceleration, and ride are among the most essential properties of a motor vehicle and, therefore, should be well understood by every automotive engineer. Achievement this goals requires a better understanding of a vehicle as a system, so that qualities and performance can be predicted at an early stage of the design.

·2001 SAE® Tech Papers, 2000 SAE® Tech Papers, 1999 SAE® Tech Papers, Other Tech Papers - Tudományos műszaki közlemények

Die Berücksichtigung unterschiedlicher Straßenreibwerte an Vorder- und Hinterachse bei der Auslegungsoptimierung von Bremssystemen The consideration of the differences of road friction factors at the front and rear axles by the optimization of the distribution of the braking forces Prof. Dr. Eberhard R. Drechsel; Prof. Dr. Gisbert Wermuth (FH München + FAF), Dipl.-Ing. Carsten Müssig (MCC smart GmbH)(német, PDF, AcrobatReader igény)

Welcome to the DriveTrain Plus™ by ArvinMeritor Tech Library! Here’s where you can easily access product brochures, maintenance and service publications, and specifications and vocational warranty information for ArvinMeritor’s broad range of components for commercial vehicle systems. Our Tech Library features Meritor’s front, steer and drive axles; trailer axles; braking system components; drivelines and universal joints; air suspension systems; tire inflation systems; and transfer cases; ZF Meritor transmission shift systems; Meritor WABCO vehicle control systems; and Meritor Clutch Company products

Dynamic EGR Estimation for production Engine Control. Martin Müller, Peter M. Olin and Bart Schreurs. Delphi Automotive Systems. Copyright SAE 2001