{"id":3586,"date":"2026-05-19T11:57:36","date_gmt":"2026-05-19T09:57:36","guid":{"rendered":"https:\/\/itpower.de\/en\/?page_id=3586"},"modified":"2026-05-21T14:49:07","modified_gmt":"2026-05-21T12:49:07","slug":"virtual-ecu-for-control-unit-testing","status":"publish","type":"page","link":"https:\/\/itpower.de\/en\/blog\/virtual-ecu-for-control-unit-testing\/","title":{"rendered":"Virtual ECU for control unit testing"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"3586\" class=\"elementor elementor-3586\">\n\t\t\t\t<div class=\"elementor-element elementor-element-03d2ef0 e-flex e-con-boxed e-con e-parent\" data-id=\"03d2ef0\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-c8ef449 elementor-widget elementor-widget-text-editor\" data-id=\"c8ef449\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h1><strong>Using Virtual ECUs for Early Control Unit Testing<\/strong><\/h1><p>One of the key challenges in software development for automotive control units is the increasing complexity of both hardware and software, as well as that of the surrounding systems. Modern vehicles contain dozens to hundreds of <strong>Electronic Control Units (ECUs) <\/strong>that are interconnected via bus systems such as <strong>CAN, LIN, FlexRay<\/strong> and <strong>Ethernet <\/strong>and execute highly complex control algorithms.<\/p><p>Particularly in the context of automated driving, it is clear that the sheer number of necessary tests can no longer be handled solely through real-world test drives or Hardware-in-the-Loop (HiL) systems. Validation through \u201cvirtual testing\u201d is therefore increasingly becoming an indispensable complement to traditional testing methods. The introduction of virtual ECUs makes it possible to test ECU software earlier and more intensively, thereby improving software quality and identifying safety risks at an early stage of development.<\/p><h2><strong> What is a virtual ECU (vECU)?<\/strong><\/h2><p>A <strong>virtual electronic control unit (vECU)<\/strong> is an artifact that contains all the software components needed to simulate the essential aspects of a real electronic control unit. The software does not require ECU hardware but runs on a PC-based simulation platform.<\/p><p>More precisely: A vECU consists of C code that was either generated from a controller model, originates as production code from ECU software development, or is available as pre-compiled binary code. It is typically used to test ECU software\u2014in this case, the vECU is the \u201cSystem under Test\u201d (SUT). Additionally, a vECU can also be used to generate input for other ECUs, i.e., as a realistic <strong>bus simulation<\/strong>. This allows already integrated software to be tested before the target hardware is available.<\/p><p>Since large portions of the software in the vECU are already available as production code, its subsequent transfer to the real ECU is easy to implement. Virtual ECUs can also be easily scaled through the use of computing power and run in the cloud, for example\u2014a decisive advantage over physical test setups.<\/p><h2><strong>Levels of Virtualization for vECUs<\/strong><\/h2><p>Depending on the application, vECUs can be used with varying degrees of realism and corresponding complexity. A classification method developed by <a href=\"https:\/\/www.prostep.org\/\" target=\"_blank\" rel=\"noopener\">prostep ivip<\/a> prostep ivip ranges from Level 0 to Level 4:<\/p><p><strong>Level 0 \u2013 Controller Model:<\/strong> The simplest vECU contains only the controller model itself (e.g., as a MATLAB\/Simulink model) or the C code generated from it (e.g., as an FMU). It contains no production code and no parts of the base software. This type is suitable exclusively for testing the control algorithm itself.<\/p><p><strong>Level 1 \u2013 Application Level:<\/strong> The Level 1 vECU contains the production code of the application software. The software components are supplemented by lower-layer functions created specifically for the vECU (e.g., RTE and operating system in AUTOSAR). The vECU communicates at the signal level, without bus or network communication. It is suitable for testing application functionalities across multiple components.<\/p><p><strong>Level 2 \u2013 Simulation BSW:<\/strong> Level-2 vECUs additionally offer simulated basic software (BSW) functionalities created specifically for simulation purposes\u2014such as a COM stack, NVRAM functionality, or diagnostic functions. Unlike Level 1, Level 2 vECUs can communicate at the bus or network level (e.g., via simulated CAN or Ethernet).<\/p><p><strong>Level 3 \u2013 Production BSW:<\/strong> Level 3 vECUs contain not only the application\u2019s production code but also the production code for the base software. Both the application and base software must be hardware-independent. In the AUTOSAR context, this includes everything above the Microcontroller Abstraction Layer (MCAL), the operating system, and hardware-independent parts of complex drivers. This level is currently the most widely used.<\/p><p><strong>Level 4 \u2013 Target Binary:<\/strong> The Level 4 vECU contains the production code compiled for the real target ECU, including any hardware dependencies. Instruction set simulation is required for execution on a simulation platform. For this vECU type, an identical build process is used for both simulation and the real ECU\u2014no code changes are required.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-c2a698e e-flex e-con-boxed e-con e-parent\" data-id=\"c2a698e\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-c041692 elementor-widget elementor-widget-image\" data-id=\"c041692\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/itpower.de\/en\/wp-content\/uploads\/sites\/3\/2026\/05\/autosar-sw-layer2-1024x683.png\" class=\"attachment-large size-large wp-image-3590\" alt=\"\" srcset=\"https:\/\/itpower.de\/en\/wp-content\/uploads\/sites\/3\/2026\/05\/autosar-sw-layer2-1024x683.png 1024w, https:\/\/itpower.de\/en\/wp-content\/uploads\/sites\/3\/2026\/05\/autosar-sw-layer2-300x200.png 300w, https:\/\/itpower.de\/en\/wp-content\/uploads\/sites\/3\/2026\/05\/autosar-sw-layer2-768x512.png 768w, https:\/\/itpower.de\/en\/wp-content\/uploads\/sites\/3\/2026\/05\/autosar-sw-layer2.png 1536w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Virtualisierungslevel f\u00fcr virtuelle Steuergar\u00e4te nach prostep ivip<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-f1c7c7d e-flex e-con-boxed e-con e-parent\" data-id=\"f1c7c7d\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-c150a57 elementor-widget elementor-widget-text-editor\" data-id=\"c150a57\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h2><strong>Software Layers of a vECU: The Case of AUTOSAR<\/strong><\/h2><p>To understand what goes into a vECU, it is helpful to look at the layer model of a real ECU. Using the <strong>AUTOSAR Classic<\/strong> Platform as an example, the software is divided into the following layers:<\/p><p>The <strong>application layer<\/strong> contains the actual control algorithm and is, in most cases, the \u201csystem under test.\u201d Below this lies the <strong>Runtime Environment (RTE)<\/strong><b>,<\/b> which acts as a connection layer between the application and the base software and is generated differently depending on how the software components are distributed across various ECUs. The <strong>base software (BSW)<\/strong> provides services for bus communication, memory, and input\/output. Hardware-dependent components are encapsulated in the <strong>Microcontroller Abstraction Layer (MCAL)<\/strong><b>.<\/b> If complete decoupling from hardware dependencies is not possible, so-called <strong>complex drivers<\/strong> are used, which connect the application software directly to the microcontroller.<\/p><p>For simulation, certain parts of these layers must be replaced or adapted. For example, hardware drivers for vECUs must be implemented differently than the drivers for real ECUs. Depending on which layers are included in the vECU and in what form (production code or simulated replacement implementation), the corresponding vECU level is determined.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-96363cf e-flex e-con-boxed e-con e-parent\" data-id=\"96363cf\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-88a3c21 elementor-widget elementor-widget-image\" data-id=\"88a3c21\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"1024\" height=\"475\" src=\"https:\/\/itpower.de\/en\/wp-content\/uploads\/sites\/3\/2026\/05\/autosar-sw-1024x475.png\" class=\"attachment-large size-large wp-image-3591\" alt=\"\" srcset=\"https:\/\/itpower.de\/en\/wp-content\/uploads\/sites\/3\/2026\/05\/autosar-sw-1024x475.png 1024w, https:\/\/itpower.de\/en\/wp-content\/uploads\/sites\/3\/2026\/05\/autosar-sw-300x139.png 300w, https:\/\/itpower.de\/en\/wp-content\/uploads\/sites\/3\/2026\/05\/autosar-sw-768x356.png 768w, https:\/\/itpower.de\/en\/wp-content\/uploads\/sites\/3\/2026\/05\/autosar-sw-1536x712.png 1536w, https:\/\/itpower.de\/en\/wp-content\/uploads\/sites\/3\/2026\/05\/autosar-sw.png 1842w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/>\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\">Layer model of the AUTOSAR Classic platform according to prostep ivip<\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-5ad354c e-flex e-con-boxed e-con e-parent\" data-id=\"5ad354c\" data-element_type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e055a96 elementor-widget elementor-widget-text-editor\" data-id=\"e055a96\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h2><strong>Standards and Tools: FMI, AUTOSAR &amp; Co.<\/strong><\/h2><p>The creation, management, and commissioning of vECUs are carried out using toolchains from various vendors, such as <strong>dSPACE, Vector Informatik, and Synopsys<\/strong><b>.<\/b> These tools provide capabilities for bus simulation <strong>(CAN, LIN, Ethernet)<\/strong>, support for AUTOSAR development, environmental simulation, test automation, and continuous integration. The tools can be seamlessly integrated into existing toolchains for ECU development, allowing tests to run on the same platform and be reused for the actual ECU. On the standardization side, two approaches play a key role:<\/p><p>The <strong>Functional Mock-up Interface (FMI)<\/strong> simplifies model exchange between OEMs and suppliers via a standardized C-API. An FMU (Functional Mock-up Unit) is a compressed file containing an XML description as well as source code or precompiled binaries. FMI is well-suited for Level 0 and Level 1 vECUs. For higher levels, however, the standard reaches its limits: The current version 2.0 supports only scalar data types and offers no efficient way to represent bus communication such as CAN, FlexRay, or Ethernet.<\/p><p><strong>AUTOSAR\u00a0<\/strong>standardizes the software architecture of ECUs and defines a clear interface between hardware-dependent and hardware-independent code components\u2014particularly through the OS and MCAL. This interface could serve as the basis for a vECU standard. AUTOSAR covers both the Classic Platform and the Adaptive Platform (for more dynamic architectures that can be configured at runtime).<\/p><h2><strong>Advantages of virtual ECUs: Quality, Cost, Compliance<\/strong><\/h2><p>The use of virtual ECUs offers measurable advantages throughout the entire development process:<\/p><p><strong>Early error detection:<\/strong> Many software errors that previously only became apparent during HiL and vehicle testing can now be identified and corrected in advance. This significantly reduces costly late-stage errors.<\/p><p><strong>Scalability:<\/strong> vECUs can be easily scaled by utilizing additional computing power and run in the cloud\u2014ideal for extensive regression tests or load tests.<\/p><p><strong>Efficiency through reuse:<\/strong> Tests created in SIL mode with vECUs can, in many cases, be directly reused in subsequent HiL operations with the real ECU.<\/p><p><strong>Regulatory-compliant archiving:<\/strong> A vECU can be easily archived and put back into operation as needed\u2014for example, to demonstrate compliance with regulatory requirements such as ISO 26262 or UN-ECE regulations.<\/p><p><strong>Earlier availability of the test object:<\/strong> Since no real ECU is required for testing, software development and validation can begin independently of the hardware delivery date.<\/p><h2><strong>Conclusion\u00a0<\/strong><\/h2><p>Virtual ECUs are no longer a topic for the future\u2014they are now a crucial component of modern, efficient ECU development. Those who adopt vECU-based test strategies early on benefit from shorter development cycles, higher software quality, and more robust compliance with regulatory requirements.<\/p><p>If you would like to learn more about the potential use of virtual ECUs in your development process or need advice on selecting a suitable tool environment, we are happy to assist you. 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Modern vehicles contain dozens to hundreds of Electronic Control Units (ECUs) that are interconnected via bus systems such [&hellip;]<\/p>\n","protected":false},"author":85,"featured_media":3588,"parent":3243,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-3586","page","type-page","status-publish","has-post-thumbnail","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Virtual ECU for control unit testing | ITPower Solutions<\/title>\n<meta name=\"description\" content=\"By introducing virtual ECUs, you can test ECU software earlier and more thoroughly, thereby improving quality!\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/itpower.de\/en\/blog\/virtual-ecu-for-control-unit-testing\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Virtual ECU for control unit testing | ITPower Solutions\" \/>\n<meta property=\"og:description\" content=\"By introducing virtual ECUs, you can test ECU software earlier and more thoroughly, thereby improving quality!\" \/>\n<meta property=\"og:url\" content=\"https:\/\/itpower.de\/en\/blog\/virtual-ecu-for-control-unit-testing\/\" \/>\n<meta property=\"og:site_name\" content=\"ITPower Solutions GmbH\" \/>\n<meta property=\"article:modified_time\" content=\"2026-05-21T12:49:07+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/itpower.de\/en\/wp-content\/uploads\/sites\/3\/2026\/05\/adobestock_974892088-scaled.jpeg\" \/>\n\t<meta property=\"og:image:width\" content=\"2560\" \/>\n\t<meta property=\"og:image:height\" content=\"1086\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"7 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/itpower.de\\\/en\\\/blog\\\/virtual-ecu-for-control-unit-testing\\\/\",\"url\":\"https:\\\/\\\/itpower.de\\\/en\\\/blog\\\/virtual-ecu-for-control-unit-testing\\\/\",\"name\":\"Virtual ECU for control unit testing | ITPower Solutions\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/itpower.de\\\/en\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/itpower.de\\\/en\\\/blog\\\/virtual-ecu-for-control-unit-testing\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/itpower.de\\\/en\\\/blog\\\/virtual-ecu-for-control-unit-testing\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/itpower.de\\\/en\\\/wp-content\\\/uploads\\\/sites\\\/3\\\/2026\\\/05\\\/adobestock_974892088-scaled.jpeg\",\"datePublished\":\"2026-05-19T09:57:36+00:00\",\"dateModified\":\"2026-05-21T12:49:07+00:00\",\"description\":\"By introducing virtual ECUs, you can test ECU software earlier and more thoroughly, thereby improving quality!\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/itpower.de\\\/en\\\/blog\\\/virtual-ecu-for-control-unit-testing\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/itpower.de\\\/en\\\/blog\\\/virtual-ecu-for-control-unit-testing\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/itpower.de\\\/en\\\/blog\\\/virtual-ecu-for-control-unit-testing\\\/#primaryimage\",\"url\":\"https:\\\/\\\/itpower.de\\\/en\\\/wp-content\\\/uploads\\\/sites\\\/3\\\/2026\\\/05\\\/adobestock_974892088-scaled.jpeg\",\"contentUrl\":\"https:\\\/\\\/itpower.de\\\/en\\\/wp-content\\\/uploads\\\/sites\\\/3\\\/2026\\\/05\\\/adobestock_974892088-scaled.jpeg\",\"width\":2560,\"height\":1086},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/itpower.de\\\/en\\\/blog\\\/virtual-ecu-for-control-unit-testing\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Startseite\",\"item\":\"https:\\\/\\\/itpower.de\\\/en\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Blog\",\"item\":\"https:\\\/\\\/itpower.de\\\/en\\\/blog\\\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Virtual ECU for control unit testing\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/itpower.de\\\/en\\\/#website\",\"url\":\"https:\\\/\\\/itpower.de\\\/en\\\/\",\"name\":\"ITPower Solutions GmbH\",\"description\":\"The Software, Testing &amp; 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