Search Results

The objective of this paper is to present the update procedures and the future tendencies for the diagnosis projects in commercial vehicles, specially buses and trucks. The constant increase in the number of components and electronic systems in commercial vehicles demands that the subject “Diagnosis” be treated and previously defined, while the vehicle is in the project phase. The final goal of this thought is to provide to the vehicle the best possible acting of all the electronics systems placed in vehicle, and, as a consequence, the best running of the On-Board and Off-Board diagnosis systems which should assist the customer needs directly. The tendency is to project the vehicles of the same brand in the same conceptual line facilitating the assembly work in production line and the after sales support.

Several automotive electrical systems can be analyzed and optimized using circuit simulators and simple equivalent circuits. However, there are several cases in which it is easier to include data collected from experimental measurements such as very complex waveforms derived from electrical conducted noises. The objective of this work is to show how to improve the accuracy of the simulations by importing experimental data such as voltage waveforms generated by solenoid valves while switching off. Nowadays, due to the storing features already available on modern measurement systems, this procedure is easier, allowing the recording of the measured data in simple computer files (usually in ASCII format).

In order to attend the more demanding expectations of the commercial vehicles customers, it is being looked for improvements in order to reach better comfort on driving. Among the systems that interact with the driver, the shifting system can be distinguished. The development of a commercial vehicle shifting system is getting complex, because besides making possible the gear changes, it should follow comfort, ergonomics and durability parameters, balancing the necessary robustness for heavy applications with the shift smoothness desired by the user. At the start of the development of commercial vehicles shifting systems, the concept to be applied is analyzed, defining the model. Then it starts the study of the system construction, according to layout parameters of the vehicle project. This stage is predominantly accomplished by computer models. Then the prototypes are manufactured, in which functional tests are made for refinement.

This paper intends to show how Telematics has started in Brazil and describe its impact in the traditional way of making Business with commercial vehicles. We want to make a brief comment about the main enabling technologies for the Telematics improvement: Telecom infrastructure: the investments after the privatisation of the sector, as well, trends for new services (WAP, SMS, Tracking, etc); Internet infrastructure: the growing of internet accesses and its impact in the industrial economy; The impact of these new technologies in the trucking Business and how Brazil is prepared for. New investments that are coming; The impact of IT technologies in the Brazilian GIP (Gross Internal Product) and in the Transportation market.

During the last years, DaimlerChrysler do Brasil (DCBR) has been moving ahead in order to research and to develop an Automatic Vehicular Location System (AVL System) due to the increase of the security through blocking and tracking devices, monitoring and mainly, logistic solutions that includes maintenance and fleet management. DaimlerChrysler do Brasil faced the necessity to prepare a test that could reflect a real situation, not only to try the system's features regardless communication and management of transmitted data, also however, to ensure the durability and reliability of the on-board vehicles equipment focusing on Brazilian Infrastructure. The objective of this paper is to describe the methodology, used tools and acquired results obtained by DCBR improvement test of his AVL System, throughout the “9o Rally Internacional dos Sertões - 2001”.

The objective of this paper is to present the update procedures and the future tendencies for the diagnosis projects in commercial vehicles, specially buses and trucks. The constant increase in the number of components and electronic systems in commercial vehicles demands that the subject “Diagnosis” be treated and previously defined, while the vehicle is in the project phase. The final goal of this thought is to provide to the vehicle the best possible acting of all the electronics systems placed in vehicle, and, as a consequence, the best running of the On-Board and Off-Board diagnosis systems which should assist the customer needs directly. The tendency is to project the vehicles of the same brand in the same conceptual line facilitating the assembly work in production line and the after sales support.

The purpose of this article is to present the reasons which justify the electromagnetic compatibility (EMC) evaluations used for automotive vehicles. It shows practical experiences of field measurements. Current actions in Brazil to prevent future problems are presented.

Approximately 50% of the industrial processes are related to the measurement and control of temperature. The automotive industry often uses thermocouples, transducers that work according to thermoelectric principles. For higher measurement reliability it is necessary to calibrate these transducers, preferably at low cost. The thermal laboratory at DCBR is developing calibration procedures and the evaluation of associated uncertainties. The object of this article is to present the thermocouple calibration process among other transducers and specially the importance of their vehicle application.

The purpose of this paper is the presentation of the main experiences of customers and users of trucks and buses regarding the electronic systems placed in these vehicles, specially in the Latin American market. Basically, in the past years the number of on-board electronic devices increased a lot and the evolution of the customer know-how concerning the new technologies is in progress. Therefore, a line between the mechanical engine and the electronic vehicle management will be traced on this paper, considering the time the customers have taken to react regarding the applied innovations.

The paper looks for the degree of linear correlation of some acoustic parameters concerning Speech Intelligibility in vehicles. The Articulation Index (AI) was originally a criterion to characterize the influence of parasite noise on the Intelligibility of a conversation in the design of speech communication systems. Introduced in the automobile acoustics, it is more and more commonly used by vehicles manufacturers to estimate the middle and high frequency content of spectra noise inside various types of vehicles driven under several running conditions. The correlation with Speech Intelligibility, measured through subjective measurements is well known. Presently we have more sophisticated parameters like STI, RASTI, SII… directed mainly to architectural acoustics and sometimes used in vehicle acoustics. They require specific hardwares and softwares and are more complicated to deal with and often are called machine measures of Speech Intelligibility.

The approach of the proposed technical work: - Brazilian market needs and requirements - The Internet growing up and Telematics, - Potential business to be found out, - Technical approach, - Conclusions