Triennial Report 2003 - CHARMEC

Systems for monitoring and operation – System för övervakning och drift (SD) – Systeme für Überwachung und Betrieb – Systèmes pour surveillance et opérationSD3. COMPUTER CONTROL OF BRAKING SYSTEMS FORFREIGHT TRAINSDatorstyrning av bromsar till godstågRechnersteuerung der Bremssysteme von GüterzügenContrôle par ordinateur du freinage des trains de marchandisesProject leaderSupervisorMr Håkan Edler, MSc,Computer EngineeringProfessor Jan Torin,Computer EngineeringDoctoral candidate Mr Roger Johansson(from 1999-10-01 on part-time;Lic Eng before start of project)Period 1998-07-01 – 2003-06-30(– 2004-06-30)Chalmers budget Stage 2: ksek 300+100(excluding university Stage 3: ksek 1650basic resources) Stage 4: –Industrial interests Stage 2: ksek 250+200in-kind budget (Cardo Rail+SJ)Stage 3: ksek 250+50(SAB WABCO+TrainTechEngineering)Stage 4: –Computers are being used to control processes of themost varying types and the applications are often spreadover several computers in a network. Each computercan then be placed close to sensors and actuators togather data and process them close to sources and sinks.Traditional electrical and mechanical interfaces can bereplaced by data communication in the networks. Suchdistributed real-time systems provide many advantagesas regards speed, flexibility and safety/security. Oneexample is train brakes where a distributed computersystem can give shorter response times and better meansof controlling braking processes than pneumatic systems.An important issue in the sd3 project is how to achievea satisfactory level of safety with today’s commerciallyavailable technology.Håkan Edler formally left his post at Chalmers in September2000 but has continued to contribute as projectleader. Jan Torin left his chair in May 2001 but continuesas supervisor. The project plan dated 1999-02-09 wasapproved by the charmec Board on 11 February 1999.As of 1 January 2001, the project sd3 was transferred toChalmers Lindholmen University College where RogerJohansson is employed.A fault-tolerant control system architecture has beendevised and transformed into a brake system specificationwhich has been tested and verified using the concepts“inherent redundancy” and “programmable failsafebehaviour”. The brake system specification is to beimplemented using vhdl (vhsic Hardware DescriptionLanguage with vhsic standing for Very High SpeedIntegrated Circuit) and will be suitable for synthesis infpga (Field Programmable Gate Array) to be hostedby a test-bench.The project sd3 has a reference group with membersfrom Green Cargo, sab wabco and sp and also HalmstadUniversity.Roger Johansson: Dependability characteristics and safetycriteria for an embedded distributed brake control systemin railway freight trains, Report no 8, Chalmers LindholmenUniversity College (Electrical and Computer Engineering),Gothenburg 2001, 16 ppRoger Johansson and Jan Torin: On calculating guaranteedmessage response times on the SAE J1939 bus, Report no 10,ibidem, Gothenburg 2002, 9 ppRoger Johansson, Per Johannessen, Kristina Forsberg, HåkanSivencrona and Jan Torin: On communication requirementsfor control-by-wire applications, Proceedings 21st InternationalSystem Safety Conference 2003 (ISSC21), Ottawa (Canada)August 2003, pp 1123-1132PhD student Roger Johansson (centre) and his project leaderMr Håkan Edler (left) and supervisor Professor Jan Torin inproject SD348