Hybrid cold start emissions?

Question

From my understanding, a huge amount of a vehicle's emissions (something like 85%) is produced in the first 30 seconds of the engine start. I believe it has something to do with the raw fuel pushed through before ignition catches and the fact that the catylitic converter doesn't work well until warmed up. I don't own a hybrid (yet) so I don't know how many engine stops and starts would be typical while driving to the local supermarket. Is anyone aware of any studies on the emissions generated by the many engine starts that a hybrid goes through during in-town driving? Thanks for any info

Answer 1

The gas engine interrupt will only occure when the engine is up to proper temps and when the battery is fully charged.  So on those cold morning drives....you aren't going to shutting off at stop lights for several miles anyway.

Answer 2

Dana, check your math, that's only city driving. At highway speeds your hybrid is just another gasoline powered car.

Ambient temperature would also play a huge role in this.

Answer 3

No, as far as I know they just measure average carbon emissions.  For example, on average the Prius emits 104 grams of CO2 per kilometer of driving.

http://www.hybridsynergydrive.com/en/pri...

An average sedan emits somewhere around 150-170 g/km of CO2.

However, an engine will only be cold during the first start.  The internal combustion engine in a hybrid will turn off if you're sitting at a stoplight for a few seconds, but it won't have gone cold by the time it starts up again.

Answer 4

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