Automatic Leveling System Research Articles

DESIGN AND HARDWARE-IN-THE-LOOP SIMULATION OF AN AUTOMATIC HEADLIGHT CONTROL SYSTEM

This paper presents the hardware in the loop simulation of an Adaptive Headlight System for motor vehicles. The headlamp orientation control system rotates the right and left low beam headlights independently. It also possesses an automatic headlamp levelling system, which, in addition to compensating for different loads, also cancels out the pitching effect during acceleration or braking to provide better night time visibility. The real time vehicle model used in this paper is the single track model with a half car suspension system. The hardware-in-the-loop simulation setup proposed for testing the adaptive headlight concept is based on a driving simulator. Real time simulations using this simulator are used to illustrate the approach.

Specification and Validation of Embedded Systems using LUSTRE and ARGOS. Case Study: The Automatic Headlight Leveling System

In thisarticle, the design, modeling and validation of embedded systemsis examined. There exist commercial tools for the developmentof control- or data-flow dominated systems, e.g.STATEMATE for control dominated systems and MATLAB for data-flowdominated systems, but there are problems to describe mixed systems.The system is split in a control and a transformation part. Thecontrol part is described with the graphical language ARGOS,the transformation part with the data-flow language LUSTRE. Integrationis done based on their common synchronous architecture. The designprocess is shown in a case study on an industrial application,the automatic headlight leveling system. A validation strategyaccording to the separation of the system is shown. Safety propertiesof the control part are proved with model checking, functionalcorrectness is shown in two steps by simulation and hardwarein the loop simulation.

Broad-Band Isolators and Variable Attenuators for Millimeter Wavelengths

A longitudinally magnetized rod of ferrite has been used as a dielectric waveguide which provides Faraday rotation independent of frequency in the band from 50 to 60 kMc. This rotator has been incorporated into broad-band isolators with forward losses of 1 db and reverse losses greater than 30 db with return losses of approximately 20 db over the band. It has also been used in a variable attenuator with a minimum loss of 1 db and a maximum loss greater than 30 db which is essentially constant over the band. Advantages of this type of rotator at millimeter wavelengths include bandwidths in excess of 20 per cent, low field requirements (25-50 /spl oelig/), relatively large dimensions, the use of common ferrites, and the absence of conducting waveguide walls which permits rapid switching of the control field. The last feature has been utilized in an automatic power leveling system capable of removing variations of several kc frequency content from the swept output of a millimeter wave BWO.