Increasing Hardware-in-the-Loop Testing Capabilities


Endigit engineers been doing Hardware-in-the-loop (HIL) test systems for over a decade. We recently made a strategic decision to increase our investment in HIL test. One step toward this was hiring National Instruments (NI) HIL Systems Engineer Andrew Heim. Andrew has been working to help NI’s largest HIL customers to be successful in their deployment of complex test systems. Adding Andrew’s experience boosts Endigit’s HIL capabilities.

An HIL test system simulates physical systems to test control units or other devices. The example shown below is a test system for testing an airplane’s wing actuator controller (shown in black). In the tests we simulate the flight control computer, the wing, and the actuator (shown in blue). This simulation is accomplished by either acquiring or generating all of the signals on the wires that connect to the controller. With that feedback loop in place, we can run software models to mimic behavior of the real system – and run those continuously. Then we can inject scenarios by changing variables over time – whether that be airspeed, temperature, or critical fault scenarios.

With these simulation capabilities, we can do full testing on the UUT without needing to fly an actual plane. We are able to run the UUT through full flight patterns without needing an airplane or other costly equipment. Test can be run more precisely and repeatably since can be run from a script. This is beneficial because we can run more test situations in less time without risk of damage to equipment or operators. Additionally, we can achieve far more test coverage than we could without such simulations.

In a world of complex model-based-design-built systems, ubiquitous embedded controllers, and differentiating features defined by software, this sort of system-level simulation has become industry best practice.

hardware in the loop testing

Endigit will continue to grow our capabilities and experience in HIL test systems. If you have a controller you need tested then let us know and we are happy to help you with it. Also, look forward to blog posts from Andrew to increase your understanding of HIL test systems.



Bryan Heslop

Vice President of Sales and Marketing, Vice President of Human Resources, Staff Systems Engineer

Bryan first discovered he was a megageek in a college physics class when he got way too excited about tesla coils (most people figured it out much sooner). Bryan worked as a machinist programming and operating CNC lathes while attending Brigham Young University. He earned a degree in Computer Engineering with a Business Management minor in 2008. After graduation Bryan moved to Austin, Texas to work at National Instruments. He worked as an Applications Engineer in the Engineering Leadership Program for 2 years then spent 1 year in Albuquerque, New Mexico as a Field Sales Engineer. He then moved back home to Utah and worked as District Sales Manager for National Instruments where he managed NI’s large accounts in Utah like Hill Air Force Base, Boeing, Northrop Grumman, OrbitalATK and L-3.

At Endigit Bryan is responsible for sales and marketing. As a Certified LabVIEW Architect, he also works as a Systems Engineer doing LabVIEW development.

Bryan enjoys everything about water (boating, swimming, rock skipping, drinking, etc.), riding ATVs, comedy writing, exploring the mountains around his home and dreams of going to space.  He also serves as a volunteer firefighter and emergency medical responder in his community.

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