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this post was submitted on 14 Jun 2023
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You Should Know
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I always wondered why hybrids could start their engines instantaneously, when many conventional cars couldn't. This is why, isn't it?
I can't speak for other cars, but my Prius uses the electric assist motor as the starter motor as well. Compared to a regular ICE car that's a massively stronger electric motor than average starting a smaller than average engine.
My favorite thing about it though is I have the longer hatchback model and if you replace one of the back seats you can fully lie down for car camping. What about the heat you may ask? I can just leave the AC on overnight, the car will start up and use the engine like a generator to recharge the battery then turn back off autonomously. I always keep some spare gas in case but I'm always shocked how little it uses.
According to priuschat you can leave your prius "idling" with light duty power draws (a small lcd tv and a fan) for about 7 days on a full tank of gas.
Also I think on the prius the starter motor-generator is also the one that bleeds excess engine power to charge the battery, but I'm not 100% sure on that one.
Regular old cars use weak starter motors from the 12V battery. They've gotten better, but it's still just a small part used only to start the car, so it only turns over the engine fast enough to get it going.
A car like a Prius will put the car's big, beefy generator in "reverse" to start the motor at whatever RPM the computer wants it at, and since it has abundant power from the synergy drive batteries, it can start the engine at whatever RPM the computer deems appropriate.
Also the fact that a hybrid has a huge electric motor to start the petrol engine instead of a small starter motor.