Hil testing

Thorough and reliable tests are necessary to verify and validate design. But, as modern systems grow in complexity, particularly in software, this critical step is more easily said than done. Consider testing the electronic components of a new car. To remain relevant in today’s market, modern vehicles need to include The solution must provide comprehensive testing without the burden of using an assembled final product in the field. By allowing ECUs under test to interact with a simulated use case, you are free to test early and often to uncover as many software defects as possible. This is the basis of a hardware-in-the-loop (HIL) test. Again, consider a car. The engine ECU is responsible for converting sensor measurements into action such as adjusting air intake when the accelerator is depressed. Figure 1. Test System An HIL test replaces the engine with a simulation comprising hardware and software that interacts with real I/O as though the physical engine were present. Because updates can be made in software, you can quickly incorporate ECU or engine software changes, test a wide breadth of relevant scenarios, and expand test coverage as needed to fearlessly and comprehensively test without risk to a physical, costly system. Figure 2. Engine Replaced With HIL Simulation For HIL testing to be of value, the quality of the simulation software is of utmost importance. Simulation software must be paired with hardware that not only accounts for system specifications such as c...

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HIL tests (and XiL test methods in general) help validate embedded software on automotive ECUs using simulation and modeling techniques to shorten test times and increase coverage, especially for test cases that are hard to reliably replicate in physical lab/track/field testing. HIL testing is needed now more than ever to ensure the reliability of rapidly evolving EV and ADAS/Active Safety systems. As a test methodology, HIL is crucial for testing the increasing connectivity and interdependence between systems and vehicle domains as they jointly contribute to key vehicle attributes. NI’s HIL solutions are open and flexible. They provide for third-party model and device integration and the ability to adapt to inevitable changes in signal lists and I/O requirements. With NI, system ownership is with you, not the test vendor, so that you can maximize HIL system reuse throughout verification and validation on a common test architecture. The NI Partner Network is a global community of domain, application, and overall test development experts working closely with NI to meet the needs of the engineering community. NI Partners are trusted solution providers, systems integrators, consultants, product developers, and services and sales channel experts skilled across a wide range of industries and application areas.

As an integral part of an overall test strategy, the hardware-in-the-loop test method enables reproducible testing of real ECUs embedded in a realistic simulation environment. This offers 24/7 comprehensive testing in the laboratory, shortens validation times, and increases the range of test scenarios. Additionally, HIL allows for testing of critical corner cases without safety issues for the device-under-test or the environment in closed-loop as well as in open-loop test setups, e.g., data-replay testing. The increasing complexity of highly connected E/E architectures, evolving electric vehicles, and ADAS/AD active safety systems makes HIL testing crucial to ensure the reliability of the overall system. dSPACE HIL solutions range from component to system integration testing and cover all vehicle domains from autonomous driving to zero emissions. • HIL solutions ranging from component to system integration testing • For all vehicle domains including e-mobility and autonomous driving • End-to-end tool chain for efficient automated testing • Comprehensive offers for consulting, engineering, and training • Decades of experience with a wide range of customer projects What is HIL Testing? Hardware-in-the-loop testing means the tests of real ECUs (electronic control units) in a realistic simulated environment. These tests are reproducible and can be automated which leads to 24/7 comprehensive testing in the laboratory, shortens validation times, and increases the range of test s...

Hardware-in-the-Loop (HIL) simulation is a technique that is used for testing control systems. Carrying out a HIL simulation to test a control system is called HIL testing. The machine or physical part of the system (which we call the plant) is normally connected with the control system, through actuators and sensors. With HIL testing the plant is replaced by a simulation of the plant (which we call the HIL simulator). If the HIL simulator is designed well, it will accurately mimic the plant, and can be used to test the control system. Some HIL simulators are equipped with 3D visualization and represent the plant so well that they can be used for training. These HIL simulators are called training simulators. With a simulated plant you can run tests that would destroy a real plant or would be harmful for people in a real situation. That is why HIL simulation can greatly enhance the safe operation of machines. However there are more benefits: • • • • •

In the automotive industry, hardware-in-the-loop (HIL) refers to a method of testing and validating complex software systems on specially equipped test benches that receive data inputs from physical devices such as radars and cameras. As the automotive industry evolves toward the   A typical Performing manual testing is not practical, given the complexity of the software being developed. It is expensive and time-consuming to physically load software into an actual vehicle and test-drive it for the potentially hundreds of thousands of miles needed to make sure the software works in all types of driving conditions. How HIL works HIL testing entails simulating vehicle and environmental inputs for the For example, test scripts can create a scenario in which a vehicle traveling at 60 mph around a curve in the rain encounters an unknown object in the road or an oncoming car swerving across the center line. Cameras and radars attached to the HIL test bench send images to the ECU, and the system under test has to process that data in real time and decide the course of action to take. Benefits of HIL HIL testing is an indispensable part of the modern automotive software development process for a variety of reasons: • HIL testing can run through hundreds or thousands of scenarios without the time and costs associated with conducting physical road tests. • HIL testing can accommodate scenarios that would be too dangerous or impractical to test on the road. • HIL tests are re...

The Problem Vehicles are being controlled by progressively more advanced computers called ECUs (Electronic Control Units). Testing the designs for new ECU hardware and firmware on actual cars, trucks, and airplanes is expensive, cumbersome, and sometimes even destructive. To speed development and reduce risk, engineers test their ECU designs "virtually" by using software models to simulate various physical components like engines, wheels, and sensors. However, these "models-in-the-loop" or MILs have limitations. Would you drive a car or fly in an airplane that had been designed based only on software models? Executive Summary To bridge the gap between using MIL (models-in-the-loop or software component models) and actually building a car, truck, or airplane for each test engineering lab, engineers use HIL. Since an ECU interfaces with a vehicle through analog, digital, and bus (or messaging) inputs and outputs, an ECU can be physically tested by generating and consuming these electrical signals by placing "hardware in the loop" to emulate the vehicle. HIL enables ECU design teams to work on an engine controller in parallel with the mechanical team creating the engine. Applications can range from evaluating ECUs that control simple devices like windshield wipers to running firmware regression testing for flight controllers. You may run into different contexts for the term "HIL" depending on whether there are tight timing requirements like synchronizing automotive start-up s...