Dr.-Ing. Rainer Rasche dspace GmbH Rathenaustrasse Paderborn automotive testing expo June 22, 2010

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1 Combining Two Worlds: Precise Real-Time- Based and Convenient PC-Based Testing Dr.-Ing. Rainer Rasche dspace GmbH Rathenaustrasse Paderborn nd automotive testing expo June 22, 2010

2 Agenda Testautomation Hardware-in-the-Loop (HIL) Simulation Automated PC-based ECU Testing Real-Time Testing (RTT) Python scripting Basics on Executing RTT Sequences Examples Summary 2

3 Hardware-in-the-Loop (HIL) Simulation Advantages Early testing without real prototypes. Modifying test parameters easily. Avoiding dangerous situations. Avoiding abrasion, resource consumption. Automated testing possible. 3

4 Overview HIL Simulation HIL Simulator Processor board(s) run models in real-time, e. g. vehicle dynamics, lighting. Connected to ECU(s) via I/O and signal conditioning. Real actor loads. Power supply replaces vehicle battery. I/O I/O Board(s) Power Supply Real sensor loads. Failure Simulation on ECU pins. Actor Loads ECU(s) - Unit under Test Fault Injection Unit (FIU) Sensor Loads Bus Connected to bus systems e. g. CAN, LIN, FlexRay. 4

5 Automated ECU Testing Requirements Engineering Version Control Test Management Automated ECU Testing Repeating tests precisely and automatically as often as required. Non Real-time Real-time PC I/O < > Failure Simulation Access Remote Diagnostics (COM) Remote Calibration (COM) Real-Time Testing Platform Access < > HIL Access (ASAM HIL API) Board(s) I/O Cal/Diag ag Tool Access to all relevant test interfaces. State of the art: Convenient PC-based test development and execution. ECU(s) - Unit under Test Fault Injection Unit (FIU) 5

6 Computation of Real-Time Tests and Simulation Model Step size PreComputation Simulation Model PostComputation Idle Real-Time Testing and Simulation Model time Python interpreter is part of the real-time application. Real-time tests can be hooked in before or after model execution. Synchronized execution of simulation model and tests. every model change can be observed by real-time tests (e. g. concurrent watchdogs) real-time test can access the model in every step (e. g. for reactive stimulus) 6

7 Why Python for Describing Real-Time Tests? High-level programming concepts result in compact and readable code. Easy to learn, easy to use, easy to extend libraries. Various standard libraries available out of the box. Functionality can easily be extended by user libraries. Successfully in use for test automation of dspace simulators for several years (AutomationDesk). Python can now also be used for real-time test programming. Existing test know-how can be reused. Python objects can easily be passed between host and target. 7

8 Example: Flashing (ok) 8

9 Example: Flashing (not synchronous) 9

10 Example: Warning-light activated correctly 10

11 Example: Warning-light activated by accident 11

12 Generators and Observers Signal Generators Observers Step Wobble Pulse-Pattern Front-Rear-Synchronization Engine Start Phase Voltage Warning-Light-Activation Select data (e. g. error event logging) React (start additional test, abort the test, etc.) Run concurrently (e. g. watchdog) 12

13 Implementing A Real-Time Test Sequence Concurrent aggregation of modular signal generators and observers Wobble Pulse-Pattern Warning-Light- Activation Front-Rear- Synchronization 13

14 Implementing A Real-Time Test Sequence Pre-conditions Wobble Pulse-Pattern Front-Rear- Synchronization Warning-Light- Activation Post-conditions 14

15 Python Example Pre-conditions Post-conditions 15

16 What Real-Time Testing allows ECU Testing for Tougher Requirements Tougher Requirements for ECU Testing Timing precision (sample time precise). Reproducability (100%). Test reactivity (in same sample step). Data selection. Concurrent watchdogs. Flexible, powerful test programming language (Python). 16

17 Graphical Test Description Requirements Engineering Version Control Test Management How to combine Real-Time sequences and PC-based test descriptions? HIL Access (ASAM HIL API) I/O I/O Board(s) ECU(s) - Unit under Test Fault Injection Unit (FIU) 17

18 Graphical Test Description Requirements Engineering Version Control Test Management TestFramework Failure Simulation Access Remote Diagnostics (COM) Remote Calibration (COM) Real-Time Testing Platform Access Report HIL Access (ASAM HIL API) I/O I/O Board(s) ECU(s) - Unit under Test Fault Injection Unit (FIU) 18

19 Test Process Integration Requirements Engineering Version Control Test Management Bi-directional Synchronisation with DOORS HIL Access (ASAM HIL API) I/O I/O Board(s) SCC-based Version Control Interface for Visual SourceSafe, Subversion, MKS etc. ECU(s) - Unit under Test Fault Injection Unit (FIU) 19

20 Test Report (Overview) 20

21 Detailed Test Report: Monkey Test TurnSignalLever t t Results logged by real-time observers and transferred to host PC. t 21

22 Detailed Test Report: Monkey Test TurnSignalLever Wobble (Stimulus) t t t 22

23 Summary Timing precision, reactive and concurrent real-time tests in Python allow ECU Testing for Tougher Requirements Tougher Requirements for ECU Testing Embedded into convenient PC-based graphical test development and execution. Test Framework Initialization, Evaluation, Reporting, CleanUp, Error Handling, etc. Easy combination with other other HIL access types Diagnostics, Calibration, FIU etc. Easy integration into the test process Requirements Engineering, Version Control, Test Management etc. 23

24 Thank you very much for your attention. Copyright 2010, dspace GmbH. All rights reserved. Brand names or product names are trademarks or registered trademarks of their respective companies or organizations. Contact:

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