Toyota AXV-IV

12 Фев 2015 | Author: | No comments yet »
Toyota AXV-IV

Objectives and State of the Art

Industrial and Expected Achievements Industrial and Issues Involved

Stricter requirements and the desire for better and higher safety raises standards for current and even so for future vehicles. This into vehicles with sophistication. On the other hand, availability and maintainability have essential demands of the automotive Increased reliability is of course with proper design However, since many of the car are subject to wear and deterioration, a increase in availability can be gained the introduction of on-board monitoring and systems that can warn the before failures occur, providing condition-based maintenance. on-board tools must be with appropriate off-board systems that can lead to and effective repair solutions. with an electronic control and a high number of transmitted are typical components which can be by such a diagnostic solution. are the test procedures of such a that the functions are non-transparent to personnel.

The long-term industrial are ambitious. An increase of vehicle by reduction of vehicle breakdown due to deterioration of at least one order of These causes are responsible of 50% of malfunctions according to statistics by EUROQUALITY. A reduction of repair of nearly 50% with respect to best practice is envisioned. At the only emission related have been taken account for monitoring: see California Air Board Regulations (CARB ) for Diagnostics (OBD) II. This could be relevant as an example for European legislation. No other provisions have yet been apart from SAE/ISO tion concerning the diagnostic between on-board systems and off front end equipment (mainly for display functions concerning the codes of the connected control The SAE/ISO standard includes the possibility of extended services to be by the individual manufacturers.

The goal of the project is the development of an environment containing general strategies, a library of exemplary and a diagnostic shell, which allow the generation of custom on-board and off-board systems. The will be based on the knowledge systems (KBS) technology, on different kinds of models.

is a need to develop an integrated to the design, development and execution of and on-board vehicle diagnostics. The of off-board vehicle diagnosis is maturing. The field of on-board diagnosis is virtually non-existent. recently, the capability for on-board has been relatively primitive or It is now capable of supporting and adopting techniques used for off-board

The integrated approach can be realised in a design and development environment. environment should be capable of the designer in addressing a combi of the on-board and off-board diagnosis and producing the complementary diagnostics. possible the environment should be of automating the design and production of

The prototype environment as developed in the will need at least 2 years productisation before available in the market place. In the tool kit can be regarde as a first towards standardisation of vehicle

State-of-the-Art and Degree of Innovation

The approach to diagnosis emerged in the 80’s as a solution to some of the traditional expert system based on heuristic knowledge. then, research in knowledge-based has very much focused on model based reasoning in order to overcome limitations due to used expert systems based on empirical associations. The of the new technology is an explicit, declarative of a technical system that can be from context independent behaviour models of components from a domain library. for formulating and using such at a conceptual and qualitative level been developed in the area of reasoning (Weld-de Kleer 90 ), 92 ) and several partners in the project made significant contributions, (Dague et. al. 90 ), (Lee-Ormsby 94 ), (Struss 88. 89. 92 ). diagnosis is the task for which the advanced work has been out (Console-Hamscher-de Kleer 92 ).

Today, model based shows both a strong foundation in terms of logical (Reiter 87 ), (de Kleer-Mackworth-Reiter 90 ), (Console-Torasso 91 ), 89 ), (Dressler-Struss 92. 94 ), (Dague-Deves-Raiman 88 ), (Tatar 94 ), 94 ) and considerable work on industrial such as diagnosis of power (Beschta et al. 93 ), (Struss 92. 93 ), analogue (Dague et al. 87. 94 ), diagnosis and failure and effects analysis of automotive (Price et al. 92 ; Hunt et al. 91. 93 ), (PROMOTEX ). The indicates that the methods, and systems developed are mature for industrial applications, at least for domains and tasks. The first for model-based diagnosis are appearing on the (IDEA, RODON ).

In the automotive diagnostic systems have mainly developed for off-board The first diagnostic approach in field was the exploitation of on-board provided from the ECU, a hand-held system compatible standard ISO 9141. Later, tools employed knowledge-based technology, mainly based on analysis. Examples for such are Strategy Engine from HP and from Carnegie Group. To these limitations second-generation systems have been these systems are based on a and functional approach, the so-called Examples of such systems are (Fiat Research Centre) and MDS Research).

The main tasks to be for the application of model-based diagnosis at a scale are:

the generation of model libraries the domain,

the creation of environments provide support for model maintenance of model libraries, and of diagnostic systems,

the development of and strategies appropriate for diagnosing systems.

From the point of of the on-board diagnosis at the moment emission related systems been taken into for monitoring/fault detection. No other provisions have yet been apart from SAE/ISO concerning the diagnostic interfaces on-board systems and out-board equipment, which are mainly to electrical faults diagnosis of short circuit, open Error codes generated by on-board diagnosis systems are related to classes of symptoms and detection, rather than to localisation. Centralised diagnostic are not present on the market. Some of on-board systems have demonstrated on Japanese concept (Mitsubishi HSR-IV, Toyota while General Motors and have started research on diagnostic techniques.

The main aspects of the project are:

the use of based diagnosis for vehicles,

the integration between on-board and diagnostic systems,

Toyota AXV-IV

definition of guidelines for on-board vehicle where no standard approaches yet been defined (apart the cited OBD II).

The expected are innovative per se:

a set of reusable model for vehicle systems,

an environment for building libraries and diagnostic systems,

a set of diagnostic tested on a vehicle, that more coverage, guarantee for of their results, more power, and capabilities of fault

One of the major advances of the project is the of model libraries covering application domains and their in a variety of application examples. The of current modelling and diagnostic will be expanded by not only models of correct and faulty but also by formalising knowledge the transition from correct (or to faulty (or suboptimal) behaviour models).

This project is related to INDIA (intelligent in application), proposed to BMBF Federal Ministry of Education and The INDIA project investigates how the relevant knowledge in an enterprise can be automatically. This requires the of knowledge from the development system functions and knowledge potential faults of components, as it is by quality assurance methods FMEA.

In the UK-funded project qualitative models of automotive systems have been (Lee, Ormsby 94 ) and used as of prototype diagnosis and failure and analysis (FMEA) systems et al. 92 ; Hunt-Price-Lee 93 ).

Currently, two related both funded by the UK Engineering and Sciences Research Council. The project, is developing further the work which was under on the Jacquard project. The end result of project will be model-based to support FMEA for use by automotive engineers in their daily The tools combine electrical descriptions derived from an tool and a model of system in order to reason about the of failure (Price et al. 95 ).

Dream is a much smaller concerned with the development of that can be used to support the of more traditional diagnostic The aim here is to investigate the extent to model-based techniques can assist the of conventional automotive diagnostic

[VMBD Home ] [Aims ] State of the Art

Toyota AXV-IV
Toyota AXV-IV
Toyota AXV-IV

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