m****a
发帖数: 2593 | 1 大众丑闻一爆，才发现turbo diesel 实际运行的 NOx 是标准的15倍！
看来混动和电动是王道，丰田要继续牛X下去
Here's Why Automakers Are Making the Surprising Switch to Bigger Engines
http://fortune.com/2016/10/14/automakers-cars-bigger-engines-emissions/
These mini-motors sailed through official lab tests conducted—until now—on
rollers at unrealistically moderate temperatures and speeds. Carmakers,
regulators and green groups knew that real-world CO2 and nitrogen oxide (NOx
) emissions were much higher, but the discrepancy remained unresolved.
All that is about to change. Starting next year, new models will be
subjected to realistic on-the-road testing for NOx, with all cars required
to comply by 2019. Fuel consumption and CO2 will follow two years later
under a new global test standard.
Independent testing in the wake of VW’s exposure last year as a U.S. diesel
emissions cheat has shed more light on the scale of the problem facing
automakers.
Carmakers’ smallest European engines, when driven at higher loads than
current tests allow, far exceed legal emissions levels. Heat from the souped
-up turbos generates diesel NOx up to 15 times over the limit; gasoline
equivalents lose fuel-efficiency and spew fine particles and carbon monoxide.
“They might be doing OK in the current European test cycle, but in the real
world they are not performing,” said Pavan Potluri, an analyst with
influential forecaster IHS Automotive.
“So there’s actually a bit of ‘upsizing’ going on, particularly in
diesel.” | f********r
发帖数: 3155 | 2 turbo不会死，要死的是小排量三缸turbo，用加大排量或者混动代替
The tougher tests may kill diesel engines smaller than 1.5 liters and
gasolines below about 1.2, analysts predict. That in turn increases the
challenge of meeting CO2 goals, adding urgency to the scramble for electric
cars and hybrids.
“You can’t downsize beyond a certain point, so the focus is shifting to a
combination of solutions,” said Sudeep Kaippalli, a Frost & Sullivan
analyst who predicts a hybrids surge.
In future, he said, “downsizing will mean you take a smaller engine and add
an electric motor to it.” |
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