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Integrity of Automotive Electronic Systems, IEE Colloquium on

Date 22 Mar 1993

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Displaying Results 1 - 11 of 11
  • The use of statecharts in developing body electronics software [for automobiles]

    Page(s): 7/1 - 7/5
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (260 KB)  

    The author describes one particular area of automotive electronics where good software specifications are highly desirable: that of body controllers. He goes on to describe the statechart specification notation and shows, with the help of an example, how this notation may be particularly well suited to the kind of problems body controllers pose View full abstract»

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  • Integrity levels in automotive telematic systems

    Page(s): 3/1 - 3/3
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (120 KB)  

    The authors describe how there are two current methodologies for assessing the safety of an automotive system. The first simply categorises the system as being either safety-critical or not. This second approach is to classify the system into one of `m' integrity levels necessary for the development process. The value of `m' is usually either 5 or 8. This method, ideally, minimises the cost of development to that which is necessary but no more. During the EC DRIVE I research programme, the project `DRIVE Safely' used the IEC framework of five levels of integrity for advanced road transport telematic (ATT) systems View full abstract»

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  • An analysis of automotive signal multiplexing-the J1850 requirement

    Page(s): 2/1 - 2/6
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (224 KB)  

    Automotive electrical systems have historically not troubled the high-technology community of integrated-circuit designers and computer software engineers. In recent years though the increasing demand by consumers for ever more luxury on-the-move has necessitated a very wide range of electronically controlled add-ons to be fully integrated with the core design of the car. This in turn has put pressure on the wiring and control system, to be as efficient and compact as possible. The author examines the design and analysis of one such system able to achieve these goals View full abstract»

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  • The automotive environment and what it means to the power switch

    Page(s): 10/1 - 10/8
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (484 KB)  

    In today's trading environment, the commercial success of a vehicle is not guaranteed by good technical performance alone. Nowadays users expect that cars and vans to achieve high levels of performance for long periods of time. In other words they must be reliable and reliability of the whole depends on the reliability of the parts which, increasingly, includes complex electronic systems. The author describes some of the overstress conditions that can occur in vehicles and their effect on power semiconductor switches. He goes on to describe several methods of surviving such conditions including the use of discrete protection circuits. The author shows how integrating protection into the power chip gives devices like the Philips TOPFET and protected IGBTs, enhanced protection and introduce several other useful benefits View full abstract»

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  • The immunity to RF interference of a CAN system

    Page(s): 4/1 - 4/8
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (268 KB)  

    A Rover 820Si equipped with a controller area network (CAN) was tested for radio frequency susceptibilities in the EMC chamber at Rover Gaydon Test Centre. The car was configured in turn with two different types of twisted pair wire and a flat pair for the CAN data bus. Each type of wire was tested in the chamber at a range of frequencies and with various antenna positions. The CAN data was collected and stored on a commercially available PC based network analyzer for later analysis. The author describes the method of preparation and testing of this vehicle, with an overview of the results of this test which are very encouraging for the future of CAN View full abstract»

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  • IEE Colloquium on `Integrity of Automotive Electronic Systems' (Digest No.063)

    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (216 KB)  

    The following topics were dealt with: automotive electronics; integrity; reliability; signal multiplexing; telemetering; RFI immunity; controller area networks; formal languages; software engineering; powertrain control; sigma-delta modulation; and power electronics View full abstract»

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  • Structured software methods as applied to powertrain control

    Page(s): 8/1 - 816
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (536 KB)  

    Rover has over the last few years evolved its MEMS range of modular engine management systems, which are now fitted to the majority of the model line. Although not a safety critical device, the integrity of MEMS is vital to the performance, driveability, fuel economy, emissions and reliability of the vehicle. Detailed attention to the engineering process has produced highly reliable combination of hardware and software, demonstrated by the fact that Rover has never had to arrange to modify MEMS in the field. Four areas in which this detailed process design has proved successful are described: (1) use of data dictionaries; (2) construction of state transition diagrams; (3) reviewing of RTSA (real time structured analysis) models; and (4) recursive design View full abstract»

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  • Integrity of a vehicle multi-ECU system

    Page(s): 1/1 - 1/4
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (164 KB)  

    The author describes how the overall integrity of in-vehicle systems which contain electronic components is dependent on three main groups of components: the vehicle sensors, which may be either electronic in nature (e.g. temperature sensors) or electromechanical (e.g. throttle position); the actuators which will be largely electromechanical (e.g. hydraulic modulator); and the interconnected electronic control units (ECUs) around the vehicle. A typical structure incorporating these is shown View full abstract»

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  • Formal methods and how to start using them

    Page(s): 5/1 - 5/5
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (20 KB)  

    `Formal methods' are hardly headline news today. They are mandated or recommended in many emerging software development standards, and have been applied in published papers and case studies in some other industries. There are many courses and books to overcome the problem of learning the formal notation language. However, one hurdle still remains-what should be done to gain a greater understanding of the strengths and weaknesses of formal methods? Here, the author addresses what is needed prior to working with formal methods. Based upon her experience, she then suggests activities which will increase the understanding of formal methods and how and where they can be applied. Finally, the author outlines her future plans in this topic View full abstract»

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  • Application of sigma-delta modulation techniques to transducers [automotive electronics]

    Page(s): 9/1 - 9/4
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (160 KB)  

    The automotive industry is employing ever increasingly complex electronic control systems in modern vehicles. The object here is to indicate how modern control engineering design can assist in the production of a vital component in the control system chain namely the transducer. One device which has potentially a large market is the accelerometer used for ride control, engine knock, safety air bags etc. The technique proposed here is not limited to this type of transducer however. The technique, well known in the telecommunications and audio industries, is known as sigma-delta modulation, a technique which is not generally familiar to industrial engineers. Here a simple explanation is attempted but more importantly the special properties that are the consequence of the application of the technique are examined View full abstract»

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  • Development of guidelines for in-vehicle software

    Page(s): 6/1 - 6/5
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (204 KB)  

    The most basic vehicular electronic systems may be elementary circuits such as and interior light delay. However, many microprocessor-based systems with complex embedded software are now being fitted. These electronic control systems are often employed in safety critical applications, such as engine management, antilock braking and supplemental restraints. The growth in vehicle electronics will lead to a greater public exposure to safety critical software than in any other commonplace application. It is therefore essential that such software is not only correct but perceived as being correct. The author examines some of the issues involved in ensuring the reliability of software, with particular reference to the development in the UK of guidelines for the application of software to vehicles View full abstract»

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