Preparing Emissions Development Programmes for Euro 7

by | Mar 26, 2026 | AUTO, Blogs, Catalyst Ageing, Green Emissions Testing

by Matthew McVitty, Head of Business Performance, CATAGEN Green Emissions Testing

Euro 7 is one of the most discussed topics across automotive emissions development teams.

While the regulation is often described as simply a tightening of limits, the reality is more complex. Euro 7 will change how emissions robustness must be demonstrated across the entire vehicle lifetime.

For engineering teams responsible for powertrain development, aftertreatment systems and emissions validation, this means development programmes will need to adapt.

The challenge is no longer just passing emissions tests, it is proving that emissions performance remains robust across a much wider range of conditions and over longer operating periods.

Euro 7 changes the development challenge


Euro 7 introduces a number of changes that will increase the complexity of emissions development programmes.

Among the areas OEMs are already discussing internally are:

– broader operating condition coverage
– longer durability expectations
– tighter measurement accuracy requirements
– increased regulatory scrutiny of validation methods

    These changes increase pressure on development teams to understand not only baseline emissions performance, but also how system behaviour changes over time as catalysts age, calibration margins tighten, and application complexity grows.

    Under previous regulations, development teams could often recover performance late in the programme through targeted calibration optimisation ahead of certification. Under Euro 7, that margin recovery approach becomes harder to rely on. Compliance confidence will depend increasingly on early visibility of deterioration behaviour, stronger understanding of system robustness, and more repeatable methods for assessing lifetime emissions performance. 

    Durability visibility becomes critical

    One challenge in emissions development is that durability-related deterioration mechanisms rarely appear during early calibration work.

    In most cases, these effects only become visible later in the programme, once multiple technical factors begin to interact:

    – catalyst ageing has reduced conversion efficiency
    – calibration margins become tighter
    – increasing vehicle and powertrain derivative complexity has expanded the validation matrix

    When this happens, engineers often have limited room to make adjustments.

    For this reason, understanding how catalyst performance evolves over time is becoming just as important as measuring initial emissions performance.

    Improving visibility into durability behaviour earlier in development allows teams to identify potential risks before certification testing begins.

    The challenge with traditional durability testing

     
    Conventional durability programmes have historically relied on engine ageing to age catalysts and assess the resulting emissions performance. While this methodology is well established, it becomes increasingly challenging to deploy efficiently across large development portfolios spanning multiple vehicle platforms, powertrain variants and calibration states. 

    While this approach has been used successfully for many years, it can present several challenges when programmes scale across multiple vehicle platforms.

    Engine durability testing can be:

    – time intensive
    – expensive to run repeatedly
    – difficult to scale across large development portfolios

    Engine ageing methods embed system level variability into the ageing process. Variations in engine out species, combustion stability, fuel composition, lubricant interaction, exhaust thermal management and duty cycle execution can all influence catalyst ageing and measured conversion behaviour.

    From a data quality perspective, this introduces test noise that can obscure the underlying catalyst signal. Distinguishing genuine catalyst degradation from engine-induced variability becomes increasingly difficult, particularly when tracking gradual changes in emissions or attempting to resolve differences between hardware variants.

    This reduction in signal clarity can limit confidence in the repeatability, comparability and interpretability of the results. For engineering teams, the challenge is therefore, not only, to generate durability data, but to generate data with sufficient robustness to support confident calibration, hardware and certification decisions.

    This can make it harder for engineers to isolate catalyst-specific durability behaviour and fully understand emissions margin stability.

    Why repeatable catalyst ageing matters

    As emissions development programmes become more complex, many teams are focusing more closely on repeatability in durability testing methods.

    When ageing conditions are tightly controlled and repeatable, engineers can:

    – isolate catalyst behaviour more clearly
    – detect durability drift earlier
    – improve visibility into emissions margins
    – reduce uncertainty before certification testing

      This is where alternative ageing approaches are beginning to play a role.

      At CATAGEN, we support emissions development teams through our Omega synthetic catalyst ageing technology, which removes engine variability from the ageing process through accuracy and control of key ageing conditions.

      By ageing catalysts without an engine, development teams can generate highly repeatable ageing profiles through the ageing test. This allows engineers to observe catalyst durability behaviour earlier and more clearly in the development cycle and in turn build stronger confidence in emissions compliance before entering certification phases. 

      Speak to CATAGEN about how Omega can help you quantify durability margin early, reduce export risk and protect long-term compliance confidence – https://catagen.com/contact