Auto Start/Stop - Pros and Cons

Rodney_Trotter

InsideInsurance wrote: »

So wikipedia is wrong when it says some vehicles have an electric motor to drive it when the engine is off?

It's hardly the most reliable source of information.

AdrianC

InsideInsurance wrote: »

So wikipedia is wrong when it says some vehicles have an electric motor to drive it when the engine is off?

Some do. Very, very, very few.

InsideInsurance

Rodney_Trotter wrote: »

It's hardly the most reliable source of information.

Its not flawless which is why I ask the question of if its wrong rather than saying the other poster is incorrect because wiki says otherwise.

Certainly the above poster seems to think wikipedia is correct on this point though

Ultrasonic

GolfBravo wrote: »

Not all stop-start systems use a starter motor, eg. Mazda.

Any chance of a brief explanation of how they restart the engine?

AdrianC

Ultrasonic wrote: »

Any chance of a brief explanation of how they restart the engine?

Combo generator/starter, sometimes built into the flywheel.

daveyjp

Ultrasonic wrote: »

Any chance of a brief explanation of how they restart the engine?

Mercedes use the Valeo i-stars system which is a combined alternator/starter. It can also provide cool air when the engine isn't running.

GolfBravo

Ultrasonic wrote: »

Any chance of a brief explanation of how they restart the engine?

Yes, click here --> Mazda i-Stop. It restarts the engine through combustion, no starter motor involved.

anotherbaldrick

GolfBravo wrote: »

Yes, click here --> Mazda i-Stop. It restarts the engine through combustion, no starter motor involved.

But the diagram shows start is combustion with STARTER MOTOR ASSIST

To restart the engine by combustion, the compression-stroke and expansion-stroke pistons need to be stopped at exactly the correct positions to create the right balance of air volumes. Mazda's i-stop ensures precise control over the piston positions during engine shutdown. With all the pistons stopped at the optimum positions, the system then identifies the initial cylinder for fuel injection. It injects fuel and ignites it to restart the engine. Even at extremely low rpm, cylinders are identified for sequential ignition, making the engine quickly pick up to idling speed

Good luck with that when wear and tear lets the gremlins in.

GolfBravo

anotherbaldrick wrote: »

But the diagram shows start is combustion with STARTER MOTOR ASSIST

Only in certain situations (I'm still trying to extract this extra info from Mazda engineers), usually it is done without the starter motor.

anotherbaldrick wrote: »

Good luck with that when wear and tear lets the gremlins in.

My thoughts exactly.

Ultrasonic

GolfBravo wrote: »

Yes, click here --> Mazda i-Stop. It restarts the engine through combustion, no starter motor involved.

That's really interesting, thanks. Getting the engine to always stop at particular cylinder positions seems impressive to me!

Is it reasonable to assume that all diesel engine cars (Mazda or otherwise) require starter motor involvement on re-start?