![]() ![]() This type of end-to-end work is usually done by customers with the most HIL experience. Planning is needed to set up the HIL system to make sure there are enough I/O channels and computing bandwidth for each of the controllers. HIL systems can be scaled to simulate very large systems and multiple controllers can be connected instead of only one. MathWorks specifically uses HIL simulation to refer to CHIL simulation.Ĭan HIL testing be used to study the interactions between multiple subsystems, or even an end-to-end look at the drivetrain or battery system? HIL simulation: Any real-time system mentioned above, but in most circles implies CHIL simulation.The controller is simulated by the real-time computer and connected to the real (hardware) system. RCP (rapid control prototyping): This is the complement of CHIL.A real-time computer would calculate the battery’s response to given drive profiles and provide this information to a dc-dc converter, which would emulate the output voltage of the battery such that the inverter and motor would respond as if connected to a real battery. For example, for an electric-vehicle drivetrain, a motor controller could be connected to an inverter and traction motor, but the battery is simulated. PHIL simulation (power hardware-in-the-loop): In this regime, the controller AND some portion of the power-handling hardware are being tested, with the rest of the system being virtual.In this scenario, there’s real control hardware, such as an ECU connected to a real-time computer, which simulates the hardware being controlled. CHIL simulation (controller hardware-in-the-loop): This is also typically what people mean when they refer to HIL.Specific terms (these terms always communicate a specific implementation of a real-time system) ![]() But several other related types of mixed hardware/software testing are used for design and development that may or may not involve an ECU.īefore we dive into the technology, let's get familiar with some of the more common nomenclature used across industries: ECU is the common terminology in the automotive industry otherwise, it would be referred to just as a controller or embedded system, often implemented on a microcontroller. So "ECU" is the correct term for the controller that’s being tested. When discussing HIL testing, it is the hardware/system being controlled by the engine control unit (ECU) that’s simulated. When you refer to HIL simulation, is this simulation of the ECU (I think that’s correct?), the hardware being controlled by the ECU, or something else entirely? He also reveals some of the advantages HIL testing brings to the development of EVs/PHEVs and other energy-efficient products that will enable the transition to a vibrant, sustainable economy. Since HIL also plays a major role in the creation of many other products with complex electromechanical systems (agricultural equipment, utility-scale wind turbines, etc.), Electronic Design invited Joel Van Sickel, a Senior Application Engineer at MathWorks, to introduce some of the important concepts that underlie HIL testing. Battery emulation helps accelerate testing of the electric powertrain, dc fast charging, and other EV applications that require a battery for testing. HIL testing that incorporates battery emulation can provide a competitive advantage for testing electric-vehicle components and systems. ![]() As a result, hardware-in-the-loop (HIL) simulation and testing has become one of the automotive industry's most important tools for navigating this increasingly complex design space. But designing drivetrains for electric vehicles EVs/PHEVs is more challenging than conventional vehicles due, in good part, to the large number of electromechanical components involved and the complex interactions that occur between them. Electric and plug-in hybrid-electric vehicles (EVs and PHEVs) are helping the world end its dependence on fossil fuels while reducing the cost of transportation for their owners. ![]()
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