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'''Hardware-in-the-
==How HIL works==
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==Why use hardware-in-the-loop simulation?==
In many cases, the most effective way to develop an embedded system is to connect the embedded system to the real plant. In other cases, HIL simulation is more efficient. The metric of development and test efficiency is typically a formula that includes the following factors:
1. Cost
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===Tight development schedules===
The tight development schedules associated with most new automotive, aerospace and defense programs do not allow embedded system testing to wait for a prototype to be available. In fact, most new development schedules assume that HIL simulation will be used in parallel with the development of the plant. For example, by the time a new [[Internal combustion engine|automobile engine]] prototype is made available for control system testing, 95% of the engine controller testing will have been completed using HIL simulation.
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===High-burden-rate plant===
In many cases, the plant is more expensive than a high fidelity, real-time simulator and therefore has a higher-burden rate. Therefore, it is more economical to develop and test while connected to an HIL simulator than the real plant. For jet engine manufacturers, HIL simulation is a fundamental part of engine development. The development of Full Authority Digital Engine Controllers (FADEC) for aircraft jet engines is an extreme example of a high-burden-rate plant. Each jet engine can cost millions of dollars. In contrast, an HIL simulator designed to test a jet engine manufacturer’s complete line of engines may demand merely a tenth of the cost of a single engine.
===Early process human factors development===
HIL simulation is a key step in the process of developing human factors, a method of ensuring usability and system consistency using software ergonomics, human-factors research and design. For real-time technology, human-factors development is the task of collecting usability data from man-in-the-loop testing for components that will have a human interface.
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==External links==
* [http://www.embedded.com/story/OEG20011129S0054 Hardware-in-the-Loop Simulation] embedded.com
* [http://rthil.sourceforge.net/ RTHIL Hardware-in-the-Loop Framework]
* [http://www.automotivedesignline.com/howto/199500231 HIL simulation boosts automotive design efficiency] automotivedesignline.com
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