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When is the fuel engine used in the hybrid car compare to the battery?
Hi,
short answer:
The internal combustion engine starting and running depends on conditions for full and partial hybrids, and continuously for mild hybrids.
full answer:
It depends on the hybrid, because not all hybrids work the same. I will give you the basics for any hybrid you look at.
There are three basic levels of hybrids- full, partial and mild.
- A full hybrid can move and run the AC without the internal combustion engine (ICE) running. Think all Toyota/Lexus hybrids.
A full will have strong electric motor/generators for moving and stopping the vehicle and a large capacity nickel metal hydride (NiMH) battery for storing power to move the vehicle.
The ICE can turn on at any point, however, it is designed to turn on-
- when the accelerator pedal is pressed hard
- when the available charge in the NiMH falls below a preset level (Toyota hybrids keep their NiMH between 50-70% of peak potential charge, for example)
- when moving above a certain speed or distance (usually roughly 25 mph or 25 miles of distance, although I had my Prius up to 36 mph on Thurs before the ICE turned on, so it really depends on how it's driven).
A mild can move very short distances at low speeds on electricity only before the ICE starts, but not run the AC without the ICE starting at any speed. Think the Civic Hybrid.
A mild will have smaller motor/generators and a smaller capacity NiMH to provide less boost for the ICE.
A partial cannot move or run the AC without the ICE running. There may or may not be a very limited NiMH battery. Think the Malibu Hybrid.
Essentially, the ICE is shut off at full stops (if the AC is not running) and restarts when the accelerator is pressed. The ICE will run at all speeds and distances.
I can only speak for Toyota/Lexus hybrids (for a variety of fun and legal reasons) on how their full hybrids work in specifics.
Toyota/Lexus hybrids run the electric portion of the parallel drive at all times. The ICE will start up and run only as it's needed, so there is no definitive start/stop speed or distance, only generals.
As an example, if I am on a downgrade on the highway, the ICE will shut off even at 65 mph and then restart when I go back uphill or level out.
I have other, more detailed posts here in Answers, you can do a search for those. You can also look up the main Toyota site for hybrid information (which literally has over a gig of info pages, pdf's, and moving gifs and diagrams) at:
www.hybridsynergydrive.com
Good luck with your project.
