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pAGe 24 HIL AND SIL Indestructible right from the start HIL and SIL tests for heavyduty equipments with ASM
Construction, mining, demolition and forestry in the modern age are dynamic, increasingly complex tasks, and the heavyduty equipment involved has a lot more intelligence inside than one would guess from the outside. The release tests on the electronic systems for the brand new machinery illustrate how development processes are conducted at Caterpillar. From function design with custombuilt highfidelity models to the validation of control software, Caterpillar has efficient processes in place. Caterpillar (Cat, for short) is an international company that manufactures heavyduty equipment for the worldwide markets of construction, mining, agriculture, and power generation. The products are equipped with electronic control units (ECUs) ranging from engine and transmission mana gement to dedicated control devices for specific system features. At Caterpillar, softwareintheloop (SIL) and hardwareintheloop (HIL) testing are the standard methods for productive development and to efficiently ensure the quality and reliability of these ECUs. To test the engine ECU of its heavyduty equipment, Caterpillar chose the diesel engine model and physical turbocharger model from <strong>dSPACE</strong>’s Automotive Simulation Models (ASM). A customized drive train model from Caterpillar was used to meet the requirements of the equipment drive train. Due to the openness of the ASM, it was quite easy to integrate the custom drive train models with ASM. High-Fidelity models for Combustion Control The development of new control functions begins with using highfidelity engine models created by Caterpillar that simulate the combustion process in great detail – but not in real time of course. The result of many years of development, these “Enterprise” models are ideal for function design, where precise control of the fuel and air systems and of combustion is essential. The models use a onedimensional approach. The combustion models also take cylinder pressure into account. During simulation with Enterprise, development focuses on optimized torque output, minimized fuel consumption, etc., but not on diagnostics and interECU communication yet. Early Controller Software Validation In the next step, more ECU functions are integrated with the combustion control functions. SIL testing is a common procedure at Caterpillar to pAGe 25
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Page 5 and 6: 20 AiR-fUel RATiO | pAGe OpTimAl 48
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Page 13 and 14: Function Development & Communicatio
Page 15 and 16: The future of the brake is electric
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Page 19 and 20: “ The test system that IABG set u
Page 21 and 22: airfuel ratio control performed b
Page 23: “ We replaced the ECU with a dSPA
Page 27 and 28: Reprinted Courtesy of Caterpillar I
Page 29 and 30: Eleven robot car teams out of the o
Page 31 and 32: Moritz Werling from Team AnnieWAY f
Page 33 and 34: “ The whole event was amazing! A
Page 35 and 36: Two of our students in the faculty
Page 37 and 38: Road Traffic Roads To have a lot ha
Page 39 and 40: Driver assistance systems such as A
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Page 47 and 48: Transparent and Safe modeling The n
Page 49 and 50: A conversation with Dr. Herbert Han
Page 51 and 52: And a Japanese company was experime
Page 53 and 54: “ We haven’t wasted our time on
Page 55 and 56: The young scientists Wolfgang Fritz
Page 57 and 58: Interview Dr. Herbert Schütte, Dir
Page 59 and 60: dSPACE direct Would you like upto

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