Summary of Euro 7/VII proposal – criteria pollutants
November 10, 2022
The EU Commission has proposed Euro 7 / VII emission standards for light- and heavy-duty vehicles. Here is a quick tabular summary.
The EU Commission has proposed Euro 7 / VII emission standards for light- and heavy-duty vehicles. Here is a quick tabular summary.
Around 40% of the US now follows California’s tougher-than-federal criteria pollutant standards. Here’s a summary of the latest, including followers of the Advanced Clean Cars rule.
Here’s a summary of possible changes to emission standards for passenger cars being considered as part of Euro 7.
The US EPA has revised the fuel economy standards for model years 2023 – 2026. On average, this will require fleet averaged annual reductions of CO2 or fuel consumption by 7%. Overall, the model year 2026 CO2 emissions will be further reduced by 23% compared to the previous Safer Affordable Fuel-Efficient (SAFE) rule.
A simple calculation, taking the US as an example, to show that improving air quality for the next couple of decades will require that we continue to improve IC engines, even as electrification proceeds rapidly.
If you have not heard of the term “Environmental Justice” or “EJ” as it is abbreviated, then it’s time to read up. Policy makers have to pay close attention to this topic in the quest for a rapid transition to greener energy and mobility.
California Clean Cars 2.0 : Emission standards beyond 2025 Based on workshops held by California’s Air Resource Board (CARB) Background California has the world’s toughest gas emissions standards for light-duty vehicles. The standards phase-in to 30 mg/mi of combined non-methane organic gases (NMOG) and nitrogen oxides (NOx) by 2025. CARB is now considering tightening these and other standards even more beyond 2025, while also promoting reduced fuel consumption and electrification of the fleet. A few key takeaways follow. Non-ZEV SULEV 30 fleet and pathway to 100% EV sales by 2035 California’s Air Resource Board (CARB) is aiming for further NOx and particulate reductions from the light-duty fleet. Here’s a summary of the proposed approach, based on a workshop held on May 6th, 2021. Fleet Electrification CARB Electric Vehicle Sales Targets Goal is to achieve 100% plug-in electric sales by 2035. Move from credit driven to sales driven approach: one ZEV credit per ZEV, with 5-year credit life. PHEVs must have > 50mi all-electric range, must be able to complete US06 on all electric mode, and meet SULEV30 & zero evaporative emission standards. 20% cap on PHEVs allowed to fulfill OEM obligation to ZEV requirements. As input to cost modeling, it
GPFs work well under wide operating conditions. But, very higher filtration will be needed for Euro 7. Journal Paper Review : Particle Number Emissions of a Euro 6d-Temp Gasoline Vehicle under Extreme Temperatures and Driving Conditions https://www.mdpi.com/2073-4344/11/5/607 Background Tailpipe particle number (PN) measurements were done on a Euro 6d-temp vehicle with a close-coupled TWC and uncoated GPF in the underfloor position. Ambient temperature and driving conditions were varied. Key Takeaway (1) The tailpipe PN emissions were well below the Euro 6d limit over a wide range of ambient temperatures (-30 to + 50 C), when driving aggressively (dynamic RDE) and under stop & go conditions (“Transport for London, TfL” test), and even when including particles down to 10 nm. Key Takeaway (2) Tailpipe PN emissions were low even at very low ambient temperatures. Surprisingly the emissions peaked at 5 deg C and not at the lowest temperature (PN is expected to increase with low ambient temp. due to fuel impingement on colder surfaces and incomplete combustion). However, the authors point out that a dynamic RDE test was done before the testing at 5 C, so that the filter was most likely passively regenerated and was in a “clean” state (i.e. without
How is vehicle fuel economy (mpg) measured in the US ? Ever wonder how those city / highway MPG (miles per gallon) numbers on the sticker come from ? Here you go. The US EPA requires vehicle fuel consumption to be measured using lab chassis dynamometer testing. A representative vehicle is run over five test cycles, listed below along with the respective ambient temperatures: FTP-75 at 75 F: Represents city driving. Includes 3 measurements called bags (because the emissions are collected in bags !), with the first bag after a cold start (>12 hour overnight “soak”) and a hot start with engine off for only 10 min. HFET at 75 F: Highway fuel economy test US06 at 75 F: High speed and aggressive urban driving SC03 at 95 F: Represents the impact of air conditioner use at high temperatures Cold FTP at 20 F : Impact of cold ambient temperatures The above tests measure the fuel consumption over a wide range of driving conditions and provide a realistic assessment of on-road performance to the consumer. Note that till a few years back, only two cycles were used to measure the fuel economy: FTP-75 and HFET. Miles per gallon numbers from
