Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Hybrid PWM/Contactor controller turbo-boost

MetroMPG · 02-08-2009, 10:27 PM

The EVDL guys have chewed over this before, and the biggest obstacle is that when you go back into PWM mode from Contactor/Turbo mode, you can fry the controller.

There will be back EMF (... if I'm not mistaken ...) in the motor for a short while which will feed back to the controller at a level higher than its rated to handle.

02-08-2009, 10:27 PM	#2 (permalink)
MetroMPG Batman Junior Join Date: Nov 2007 Location: 1000 Islands, Ontario, Canada Posts: 22,530 Blackfly - '98 Geo Metro Team Metro Last 3: 70.09 mpg (US) MPGiata - '90 Mazda Miata 90 day: 54.46 mpg (US) Even Fancier Metro - '14 Mitsubishi Mirage top spec 90 day: 70.75 mpg (US) Appliance car Mirage - '14 Mitsubishi Mirage ES (base) 90 day: 62.14 mpg (US) Thanks: 4,078 Thanked 6,978 Times in 3,613 Posts	The EVDL guys have chewed over this before, and the biggest obstacle is that when you go back into PWM mode from Contactor/Turbo mode, you can fry the controller. There will be back EMF (... if I'm not mistaken ...) in the motor for a short while which will feed back to the controller at a level higher than its rated to handle. __________________ Project MPGiata! Mods for getting 50+ MPG from a 1990 Miata Honda mods: Ecomodding my $800 Honda Fit 5-speed beater Mitsu mods: 70 MPG in my ecomodded, dirt cheap, 3-cylinder Mirage. Ecodriving test: Manual vs. automatic transmission MPG showdown EcoModder has launched a forum for the efficient new Mitsubishi Mirage www.MetroMPG.com - fuel efficiency info for Geo Metro owners www.ForkenSwift.com - electric car conversion on a beer budget