Validation of Complex. Systems
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1 Validation of Complex Systems EVoCS Evolutionary Validation of Complex Systems Ross McMurran WMG, University of Warwick Lead Partner: Partners: 1
2 Content Introduction Systems of Systems Validation of SoS Design Validation of SoS Implementation Future Work Conclusions 2
3 EVoCS Project Overview Part of UK Technology Programme Project size 10M Total Partners: Jaguar Land-Rover, QinetiQ, add2, Warwick Univ Objective: To maximise confidence in the design and implementation of complex automotive electrical systems through: Innovative techniques for the validation of the design at a System of Systems level Typical Premium Architecture (Current Generation) ECU Bus Next Generation Platforms for the validation of the implementation at a Systems of Systems level 3
4 Project Consortium Relationships & Skills Test tool development JLR Automobile Customer Manufacture & / Supplier Customer Systems Integrator / Supplier Vehicle design, development & testing add2 Test Equipment Vendor Research Relationship QinetiQ Technology consulting/tools Research Relationship Warwick Academic Research Institute Research Relationship Automotive electronics modelling & testing Process analysis Research project management Dependable systems Formal methods 4
5 Content Introduction Systems of Systems Validation of SoS Design Validation of SoS Implementation Future Work Conclusions 5
6 Systems of Systems Systems of Systems are a specific type of Complex System affecting many fields including biology, sociology, engineering and military New systems are composed of a number of individual systems with their own levels of autonomy. Significant properties are: Autonomy of elements Evolutionary development Heterogeneous elements Sharing of resources Geographic distribution Emergent behaviour 6
7 Automotive Electronics SoS View Super System e.g. Broadcast, Manufacturing & Service systems, Interfaces with Consumer devices, Intelligent Transportation Systems System of Systems i.e. Vehicle Electrical System System e.g. Infotainment System Sub-System e.g. FM Radio Component e.g. Radio Receiver As systems become more complex it becomes harder: - to predict behaviour (Emergent properties) - to verify complete system (state space explosion) or sub-parts in isolation New Methods are required for Validation and Verification at System of Systems Level throughout development 7
8 Validation of Systems of Systems - Issues Late availability of vehicle level platforms Large Scale Effort to model Understanding of interactions Scaling issues with formal methods Non-homogeneous nature of individual systems Different levels of detail Different modelling techniques Different failure modes Extent of re-validation when a change occurs in one system What properties/attributes to validate at an SoS level? Those that relate most strongly to robustness 8
9 Robustness of Systems of Systems Robustness concerns the resilience of a system to maintain an appropriate level of function during and after variations or disturbances. Service Operating Regime Calibration Configuration Design Hardware (component tolerance) Manufacture Memory dynamic behaviour Software Crash failure Execution failure Method of control Radiated Interference Users Other processes Internal Operating Modes Initialisation states Shutdown states Bus Message Omission Message Commission e.g. babbling idiot Message Timing Message Content e.g. Quality factors Conducted Interference EMC Voltage Resistance Electrical Variance in Electrical Systems Actuator Operating Modes Tolerance Calibration Ground Shift Assembly Design change Plant Design fault Temp Dust Environment Sensor Manufacture (Misbuild) Fluid Humidity Vibration Tolerance Calibration Assembly Design change Design fault Tolerances Design fault Design change 9
10 Factors in Validating Robustness of SoS Sources of variation Continuous and state event driven based behaviours Coverage v s time to market Impact of failures Detecting latent faults outside nominal operating regions Transient conditions Under fault condition in another area of SoS Under conditions of variation e.g. tolerance spread, wear out System Interactions expected range 10
11 Content Introduction Systems of Systems Validation of SoS Design Validation of SoS Implementation Future Work Conclusions 11
12 System of System Design Validation Model Based Development Processes Enhanced Physical Modelling Automated Model Based Testing Typical Premium Architecture (Current Generation) Interaction Modelling Test case generation & coverage metrics Formal Methods for Dependability ECU Bus Static Code Analysis Tools Design for Robustness 12
13 Interactions at SoS Level Understanding System interactions vital for design of SoS Information typically spread across several specifications Large amount of interactions CANdb2DSM Tool Interaction Analysis TPMS RSJB RCCM PSM PDM PAM KVM JDS INST ICP ICM HDM FSJB DSM DDM CANalyz TPMS RSJB RCCM DSC ESCL INST ACC ADCM JDS TCM AFLS PIE RCM CANalyzGSM ECM EPB PSM PDM DSC PAM ESCL KVM INST JDS ACC INST ADCM ICP JDS ICM TCM HDM AFLS FSJB PIE DSM RCM DDM CANalyz CANalyz GSM ECM EPB Lack of analytical modelling techniques at SoS level to capture inter system interactions Conflict between detail and coverage Differing levels of detail known by integrator across systems 13
14 43 *2A Braking 44 *2A1 Antilock Braking (ABS) 45 *2A2 El. Brakeforce Distribution (EBD) 46 *2A4 Emergency Braking 47 *2A5 Park Braking 49 *2B Hill Holding 50 *2C Stability Traction Control 51 *2C1 Traction Control 52 *2C2 Stability Control 53 *2C3 Hill Ascent Control 54 *2C4 Hill Descent Control 57 *2E Power Steering 58 *2E0 Basic Power steering (inc by-wire) 59 *2E1 Speed sensitive steering 60 *2F Damping Control 61 *2F0 Adjustable Damping 62 *2F1 Contin. Contr. Damping 63 *2G Levelling Control 64 *2G1 Rear Levelling 65 *2G2 Front Levelling 66 *2H Suspension Control 67 *2H1 Rear Suspension 68 *2H2 Front Suspension 71 *2J Pitch Control 72 *2K Yaw Control 73 *2L Roll Control 74 *2L1 Active Cornering Enhancement 75 *2L2 Roll Stability Control 76 *2M Pedestrian Protection 77 *2N Driver Condition 78 *2N1 Driver Imparement Monitoring EVoCS Evolutionary Validation of Complex Systems Static Interaction Model e.g. INTERACTION MATRIX Braking Antilock Braking (ABS) El. Brakeforce Distribution (EBD) Emergency Braking Park Braking Hill Holding Stability Traction Control Traction Control Stability Control Hill Ascent Control Hill Descent Control Power Steering Basic Power steering (inc by-wire) Speed sensitive steering Damping Control Adjustable Damping Contin. Contr. Damping Levelling Control Rear Levelling Front Levelling Suspension Control Rear Suspension Front Suspension Pitch Control Yaw Control Roll Control Active Cornering Enhancement Roll Stability Control Pedestrian Protection Driver Condition Driver Imparement Monitoring Interactions classification: - Generic: input, output, request/acknowledge. - Complex Interaction & Dependability Modelling & Analysis Modelling Dynamic Interaction Model Modules and interactions for a function Abstract state machine model of modules internal behaviour Sufficient semantics for import into Modelworks Suitable for development into full functional model / autocoding Detailed Component Detailed Function Component Model Function (Executable Model Spec) Detailed (Executable Component Spec) Detailed Function Component Model Function (Executable Model Spec) Detailed (Executable Component Spec) Function Model (Executable Spec) Simulink/Stateflow C Code C Code C Code C Code C Code Analysis Initial Design Analysis (DSM) Design Structure Matrix - Completeness - Consistency - Functional Coupling & Cohesion Dependability Analysis (Modelworks) CSP (Communicating Sequential Processes) Tools (QinetiQ) Function Implementation Analysis (ClawZ) Assessment of adherence of code to model Static Code Analysis (Malporte) Including identification of external conditions necessary for correct execution of code 14
15 Hierarchical Approach to Design Validation Multiple refinements to check properties of detailed system System Properties Model check high level design satisfies system properties MW state machine 1... Stateflow 1 Code 1 MW state machine n Stateflow n Code n Compositional model check of stateflow model satisfies high level design State-based refinement calculus + MALPORTE healthiness checking 15
16 Advanced Physical Modelling Control Algorithm Physical Hardware Electronic (Software) Electrical Mechanical Facilitates robustness testing at SIL & HIL through modelling of variability of physical parts (e.g. tolerance and wear-out) 16
17 Content Introduction Systems of Systems Validation of SoS Design Validation of SoS Implementation Future Work Conclusions 17
18 System of Systems Validation of Implementation Next Generation HIL Tests Flexible HIL Platform Platforms for full vehicle tests Test Automation HMI Simulation & Testing Machine Vision Validation of Manufacturing Systems Robustness Testing Low Voltage Testing 18
19 EVoCS Reconfigurable HIL Platform High flexibility under software control to support intersystem robustness testing Flexible Connectivity Flexible Signal Conditioning Flexible Signal Type Flexible Signal Direction Flexible Signal Disabling Flexible ground and reference selection Flexible Fault Insertion I/O Routers Genix SC Pods ECU PSU Switching and Measurement CAN Switching LIN Switching Programmable PSU s I/O Routers PX20 Real-Time Target 19
20 EVoCS Reconfigurable HIL Platform 20
21 EVoCS Reconfigurable HIL Platform Channels can be configured individually under software control Signal type Direction Bandwidth Gain Loading requirements Internal loads can be pulled up to a supply rail or pulled down to ground Support for external loads /sensors 21
22 Low Voltage Robustness Testing Low voltage a key issue for automotive SoS Conditions of variable system states Current tests insufficiently representative of real conditions Waveform variety Duration Coverage 22
23 Low Voltage Robustness Testing Low Voltage test system Pseudo-random automated waveform generator Uniform parameters Electronic Rusty File Vehicle impedance simulator for component testing T1 -- 1/x distribution T1 -- normal distribution 23
24 Low Voltage Robustness Testing Work in progress Standardisation for release to suppliers Compact test equipment development by add2 Automated analysis of DTC s & CAN buses 24
25 Automated Infotainment Testing Fully automated robustness testing of Infotainment system initialisation Emulate expert functional testing to confirm that system (of systems) appears to be operating correctly Key elements Pseudo random initialisation Stimulation of inputs: via electrical stimulation of touch screen and remote controls Monitoring and analysis of video and audio outputs Test Automation of manual test procedures Automated logging of diagnostics and MOST bus 25
26 Automated Infotainment Testing Images (referenced to test) Camera Vision Test Trigger Test Result Host PC Control Parameters HIL Tester Electrical control of touch screen CAN Capture Data Test Automation scripts Most Master Test Script Precondition.test.post condition Precondition.test.post condition Precondition.test.post condition Precondition.test.post Test Resultscondition Precondition.test.post condition. Precondition.test.post condition Precondition.test.post condition Precondition.test.post condition Precondition.test.post condition Power Supply MOST Ring Optolyser. AMP Audio output monitoring Data Logger MOST Bus Trace 26
27 Content Introduction Systems of Systems Validation of SoS Design Validation of SoS Implementation Future Work Conclusions 27
28 Future Work Design of multi-parameter robustness tests Large scale optimisation approach Incorporating domain knowledge from design stage Modular dependability cases Overall framework for design for robustness at SoS level 28
29 Content Introduction Systems of Systems Validation of SoS Design Validation of SoS Implementation Future Work Conclusions 29
30 Conclusions Automotive Electrical System is in fact a system of systems with accompanying issues Key characteristic of System of Systems is robustness to deal with disturbances or unexpected interactions New validation tools and techniques required to deal with scale of system and fully explore robustness 30
31 EVoCS Evolutionary Validation of Complex Systems END Ross McMurran WMG, University of Warwick Stand
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