Model based development of Cruise Control for Mercedes-Benz Trucks
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1 Model based development of Cruise Control for Mercedes-Benz Trucks M. Wünsche, J. Elser Truck Product Creation (4P) TPC / MMP Agenda Introduction functional and technical overview Project description motivation and development process C-Code analysis analysing and documentation methods Control-module Structure, metrics and co-operation methods Auto-Code generation experiences and results Testing SIL, PIL and HIL test methods 2
2 World wide application Cruise Control is used in several commercial vehicles e.g. Heavy duty trucks Delivery Trucks Coaches working machines Cruise Control is used in several market specific vehicles in Europe Turkey Brazil future: NAFTA 3 Functional Overview v T 0 zero injection engine lighted friction torque endurance brakes Desired speed Hysteresis Hysteresis between Drive and Brake Mode in case of increasing slope t t Combined Cruise Control Drive Mode only drive torque allowed Brake Mode only brake torque allowed permanent open outlet valve butterfly valve drive line retarder, e.g. eddy current retarder Adaptive Mode separate controller constant distance regulation Road Speed Limiter limits drive torque activates Brake Cruise Control 4
3 Controller Overview CC-Lever Acceleration Pedal CAN - Signals Governor Limiter driver set value governor desired value Display desired speed Hysteresis Brake mode act. vehicle speed Speed Governor a a Acceleration T Drive - Brake T min Governor Switch Engine Distance Governor a act. vehicle acceleration 5 Project description World wide application needs functional extension reengineering of Cruise Control was necessary Project of model based software development Auto code generation (Real-Time Workshop Embedded Coder) -Chand written frame code m-script based build process Advantages reuse of reliable functionality reuse of known scaling model based restructuring simulation based function verification one step fixed point code generation 6
4 C - Code analysis Analysis steps Study of documentation consulting the developers automatically C-code analysis modelling of complicated code parts Analysis results Structure charts Requirements use cases function and variable database simulation models Database 7 Reengineering Tool Analyzer Automatic C-Code analysis tool Developed in R/T Department of DaimlerChrysler in an European research project Outputs structure charts function trees variable lists relation charts SQL like access functions list list of related variables 8
5 Cruise Control Model Model consists of 16 libraries 4MB mdl-files 2 MB Simulink 2 MB Stateflow blocks 140 inputs 40 outputs 340 parameters Co operation model structure is build up in CVS several programmers simultaneously 9 Co-operation methods Interface blocks encapsulate modules data type and scaling of each signal will be checked 10
6 Tool chain for auto-code generation One supplier tool chain Simulink / Stateflow Fixed-Point blockset Stateflow Coder Real-Time Workshop Embedded Coder no auto scaling used in the project Fixed point blockset most of the Simulink blocks can be used for float and fixed point simulation Embedded Coder adjustment of settings was sufficient to receive desired code appearance user defined storage classes improve code efficiency 11 Main steps for code optimisation RAM: Byte RAM / Byte Top level function-call scheduler (1) Using bit-fields in exported internal signals (2) Using bit-fields in generated data structures (3) Elimination of intermediate interface variables (4) 410 (1) (2) (3) 300 (4) 210 STACK: Byte Some subsystems realised as atomic functions (1) Elimination of the most 32bit operations (2) Redesign of some atomic subsystems (3) 220 (1) STACK / Byte (2) (3) 12
7 Hand written vs. Auto code 300 byte hand written code 27 Kb auto code 19 Kb RAM effort of Auto-Code is 16% less than optimised hand written code! RAM STACK ROM 13 Test step overview Test completion Vehicle Test HIL HIL Test Test Auto-Code Evaluation SIL Simulation Module Test Module Test Module Test % Software Development 14
8 SIL - Simulation System Driver Controller model Vehicle model Interactive tests, test-database with predefined tests and free combination of both 15 Auto-Code Evaluation Controller Model Input one time step Comparison 0,0, Deviation has to be zero! EVA-Board with Auto-Code based binary 16
9 HIL Tests Software-module Modul x x real controller hardware and software Measuring by CAN-ID s real Vehicle-CAN Stimulation by drive cycles Real-Time vehicle simulation Real-Time sensor simulation 17 Project schedule Design phase C-Code analysis Requirements documentation Structure development Structure verification Modelling of basic functions Winter test drive basic functionality ABS / ASR functionality Extending phase Modelling of additional functions HIL - testing Auto-Code evaluation Summer test drive Final inspection of the whole functionality 18
10 Conclusions Results Project needs only 18 month until release including analysis, restructuring, modelling and testing SIL based function development high state of maturity before vehicle tests start higher test efficiency desktop debugging instead of debugging in vehicle Code generation Embedded Coder meets our demands code efficiency and readability like hand written code Project aims could be reached in time! Experiences Well defined model structure is essential base for all work, especially in stateflow parts allows multiple use of the feature is a stable base of further enhancements gives easy overlook of complex functions Model reviews efficient method of model optimising shows possible incorrect parts Code evaluation manual code reviews not possible because the whole code will be renewed each time automatic code evaluation is necessary 19
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