I know this isnt a popular take but as a diesel engine mechanic, i think Amsterdam is going to be surprised at just how many "clean idle" diesel and modern trucks they are going to catch simply due to the nature of the regulation.
the regulatory ban on dirty trucks is a good thing, but most manufacturers implemented their fixes in the most ham-fisted and half-hearted way they could think of at the expense of noise emissions. take Vortec for example, a technology that creates a little mini "tornado" or air in the intake box to boost performance and improve emissions. at the hood or 'bonnet' of the truck during accelleration this thing can peak around 100db. Volvo tries to solve this with foam insulation for the intake area but that never lasts more than a few hundred thousand miles. Ive seen vortec trucks set off car alarms.
then theres the desperate attempt to keep unmaintained trucks on roads. If trucks dont get service regularly for urea tanks and other emission control devices, theyre supposed to go into 'limp' mode. 30kph, no faster, until service is made. well truck companies got around this by instituting 'regenerative' mode. if you walk past a very loud truck (and i mean freight train loud) idling in the street during a delivery, chances are good its past its service interval and has entered regen mode. idle engine speed is ramped up from 750 RPM to nearly 3500 in an attempt to generate temperatures hot enough to combust waste gasses instead of clean them on exit (frankly it doesnt really work.) its hard on the entire engine and environmental system but hey, truck still gets to do its job for the week.
I don't see anything in your comment that suggests a problem with their plan if the goal is to prevent vehicles from being too loud.... sure there may be some vehicles that are too loud because of good intentions on the emissions side, but that doesn't change the fact that they're too loud?
> i think Amsterdam is going to be surprised at just how many "clean idle" diesel and modern trucks they are going to catch simply due to the nature of the regulation
To me, this didn't read as a problem with the plan so much as an observation that they're going to be catching a broader profile of problem vehicles than they anticipated.
All in all, probably a good thing, but (as a foreigner who hasn't been there) it was, for me, an interesting observation.
It took me a few reads to come to the conclusion that this was the meaning instead of opposing the law. It feels like in needs an extra sentence along the lines of "this law will also help prevent work-arounds of existing emissions regulations."
The regeneration mode is to burn off accumulated particulates in a diesel particulate filter. This is why diesel cars typically need to be driven at motorway speeds regularly or have their DPF manually cleaned.
Urea is used to reduce NOx emissions, not particulates. It’s unrelated.
the regulatory ban on dirty trucks is a good thing, but most manufacturers implemented their fixes in the most ham-fisted and half-hearted way they could think of at the expense of noise emissions. take Vortec for example, a technology that creates a little mini "tornado" or air in the intake box to boost performance and improve emissions. at the hood or 'bonnet' of the truck during accelleration this thing can peak around 100db. Volvo tries to solve this with foam insulation for the intake area but that never lasts more than a few hundred thousand miles. Ive seen vortec trucks set off car alarms.
then theres the desperate attempt to keep unmaintained trucks on roads. If trucks dont get service regularly for urea tanks and other emission control devices, theyre supposed to go into 'limp' mode. 30kph, no faster, until service is made. well truck companies got around this by instituting 'regenerative' mode. if you walk past a very loud truck (and i mean freight train loud) idling in the street during a delivery, chances are good its past its service interval and has entered regen mode. idle engine speed is ramped up from 750 RPM to nearly 3500 in an attempt to generate temperatures hot enough to combust waste gasses instead of clean them on exit (frankly it doesnt really work.) its hard on the entire engine and environmental system but hey, truck still gets to do its job for the week.