How to Ensure Safety in ADAS Design and Verification

How to Ensure Safety in ADAS Design and Verification

Blind-spot monitoring. Adaptive cruise control. Lane departure warnings. Features like these are popular in today’s vehicles, but are consumers getting what they think they are buying? ADAS functional safety systems fall short in ways that drivers may not expect.

With the escalating deployment of these features — collectively known as Advanced Driver Assistance Systems (ADAS) — car makers must be aware of what is required to design, test, and produce systems on which the public can rely. ADAS verification and validation must show that the systems will work not only as designed, but also as intended. Doing anything less may not only lose customers but also raise the risk of injuries to vehicle occupants and liabilities for manufacturers.

Thankfully, guidance and tools are available to set manufacturers on the right course.

The Issues

Owners find comfort and convenience in ADAS systems. According to a 2018 study by the American Automobile Association, 75% of buyers find the features to be useful, and nearly the same percentage would recommend them to others.

Manufacturers are expanding the types of ADAS and are quickly adding them to a wider range of vehicles.

So, what’s the big deal? The problems stack up this way:

• Manufacturers promote ADAS as safety devices.
• There are numerous conditions under which today’s systems do not work correctly. Sensors cannot “see” if they are blocked by dirt or snow. Blind-spot monitors are typically unable to recognize vehicles passing at very high speeds. Motorcycles and pedestrians are detected with only intermittent success.
• Drivers often lack knowledge of ADAS limitations, yet they depend on these systems and modify their behavior behind the wheel as a result. Drivers are backing up and changing lanes based on sensor response rather than visually checking blind spots.
• Manufacturers are trying to shift accountability by placing disclaimers in vehicle user manuals.

This gap between user perception and product reality can spawn casualties on streets and highways. People generally assume that the items they purchase are basically safe and will not cause harm when used as directed. However, even if the driver has read the disclaimers and is being attentive, ADAS, as designed today, sometimes misbehave in ways that may startle the driver and confuse surrounding traffic. This can lead to accidents and tragedies, trigger lawsuits, and make the manufacturer the inevitable deep-pocket target for compensation.

The Right Way

Though these electromechanical wonders are in their infancy, they are already providing valuable functionality for drivers. As they mature and improve, they will become the core of autonomous vehicles. But, ADAS development must be rooted in safety. The tragic accidents involving self-driving cars just a few years ago are a reminder that the expansion of ADAS technology must be done mindfully.

ADAS must be founded on requirements-based design and testing, where safety goals are set, the design follows, and thorough testing confirms functionality. Unfortunately, the typical approach across the automotive industry today is not so meticulous; for instance, design goals that start in marketing and testing avoid potentially problematic conditions.

To advance properly, the industry needs a consistent, methodical approach to the development of vehicles and their systems, creating products conceived and developed with safety in mind, backed by complete, transparent, and traceable documentation. This will depend on the standards used.

The Standards To Use

We recommend the deployment of the following standards:

• Functional Safety (ISO 26262) — Considers the avoidance or management of malfunctions in safety-critical electrical and electronic (E/E) systems
• Safety of the Intended Functionality (SOTIF; under development as ISO/PAS 21448) — Addresses the risk of unintended behaviors from systems operating “correctly.”
• Automotive Software Process Improvement Capability dEtermination (ASPICE) — Provides a strategy for software development and a process assessment model for measuring the quality of the development

These standards provide processes to address the complexities of ADAS and autonomous vehicles. Electronic brains – using millions of lines of software code to interpret input from multiple sensors – make rapid decisions in varying (and sometimes unpredictable) circumstances and instruct control devices on the actions to take.

The standards contain numerous recommendations and guidelines, not all of which will be necessary for every product. To avoid wasting money and effort, the most effective application of the standards is to understand the intents and demonstrate that your development process satisfies them.

This may sound like a downward spiral into confusing detail, but it need not be. This is where applied expertise can be very valuable.

The support you need

LHP Engineering Solutions is a technology integrator and engineering services provider in the transportation industry. Founded in 2001, LHP provides expertise in ADAS, electrification, connectivity, and associated standards. Using a bottom-up approach, we will work with you to ensure you interpret and implement the standards correctly and efficiently. We have a clear understanding of how to manage and map standards requirements into the workflow processes you will need.

LHP is committed to creating a safe automotive landscape by delivering state-of-the-art training, hands-on consulting and implementation, dedicated on-site resources, technology solutions, and engineering services built on the latest industry standards and best practices.

Our mission is to create a safer, smarter, and more connected world through the use of autonomous technology. We believe that by developing technology solutions and engineering services built on intelligence, connectivity, and actionable insight, real autonomy is possible.

The eBook You Will Want To Read

LHP has prepared an eBook, The Guide to ADAS Products, as a resource to further educate your organization on how to ensure safety when designing and verifying ADAS products, features, and vehicles. It tells the story of ADAS deficiencies, their impact on organizations, and the standards and processes that can save the day.

The eBook also describes:

• The level of testing necessary to ensure that ADAS will function safely and as intended.
• How lab testing, rather than on-the-road testing, can make in-depth verification and validation economical.
• The value of integrating information management tools to support automated data flow and to avoid multiple (and possibly divergent) versions of the same information.

Summary

ADAS’s rapid evolution is similar to the introduction of smartphones;  they have positively affected our lives. However, there is one major difference: the impact on the user's safety and well-being. ADAS systems are marvelous combinations of electronics and hardware that provide significant support to drivers and can improve road safety, but only if implemented properly.

LHP’s eBook provides excellent guidance on how to make your ADAS project a safety success

Further reading and references

• Vehicle Owners’ Experiences with and Reactions to Advanced Driver Assistance Systems

• How to Design Safety into ADAS Products