IMA

iaowings · 05-29-2006, 08:49 PM

Hey I was wondering what are the differences between the two types.
I think that HSD would be better. I am curios though. I was unable to find much info at the Honda web site unlike the Toyota site. Honda only has a faq and that’s it.

The reason I ask is that my friends are now interested in hybrids after I got my Prius and I am unable to answer questions about anything not Toyota.

john1701a · 05-29-2006, 09:09 PM

IMA is an "assist" hybrid. Basically, one electric motor is inserted between the gas engine and the transmission. They share the same shaft, resulting in a very simple design but restricting each component to operate at the identical RPM. It's electrical system can best be described as "passive"

HSD is a "full" hybrid. It has two electric motors that interact with the gas engine through the use of a PSD (Power Split Device). This unique device provides for a dramatic range of flexibility, allowing each of the 3 power components to operate independently or in combination at any RPM. It's electrical system can best be described as "persistent".

http://john1701a.com/prius/hybrid-type_assist.htm

http://john1701a.com/prius/hybrid-type_full.htm
http://john1701a.com/prius/hybrid-type_full_details.htm
http://john1701a.com/prius/hybrid-ty..._operation.htm

iaowings · 05-30-2006, 10:18 AM

Thank you.
That is a large amount of info, will keep me busy for some time. I think I am going to print this out to show friends that way they can figure out what car they want. Personally, I like HSD.

05-29-2006, 09:09 PM	#2
john1701a Senior Member Join Date: Jan 2004 Location: Minnesota Posts: 3,376 My Car: 2010 Prius Model: IV Package: Solar Roof Thanks: 9 Thanked 145 Times in 70 Posts Friends: 12	IMA is an "assist" hybrid. Basically, one electric motor is inserted between the gas engine and the transmission. They share the same shaft, resulting in a very simple design but restricting each component to operate at the identical RPM. It's electrical system can best be described as "passive" HSD is a "full" hybrid. It has two electric motors that interact with the gas engine through the use of a PSD (Power Split Device). This unique device provides for a dramatic range of flexibility, allowing each of the 3 power components to operate independently or in combination at any RPM. It's electrical system can best be described as "persistent". http://john1701a.com/prius/hybrid-type_assist.htm http://john1701a.com/prius/hybrid-type_full.htm http://john1701a.com/prius/hybrid-type_full_details.htm http://john1701a.com/prius/hybrid-ty..._operation.htm __________________ JOHN http://john1701a.com 52.5 MPG average @ 10,808 miles

05-29-2006, 08:49 PM	#1
iaowings Join Date: May 2006 Posts: 450 My Car: Model: Package: Thanks: 0 Thanked 0 Times in 0 Posts Friends: 0	Hey I was wondering what are the differences between the two types. I think that HSD would be better. I am curios though. I was unable to find much info at the Honda web site unlike the Toyota site. Honda only has a faq and that’s it. The reason I ask is that my friends are now interested in hybrids after I got my Prius and I am unable to answer questions about anything not Toyota.

05-30-2006, 10:18 AM	#3
iaowings Join Date: May 2006 Posts: 450 My Car: Model: Package: Thanks: 0 Thanked 0 Times in 0 Posts Friends: 0	Thank you. That is a large amount of info, will keep me busy for some time. I think I am going to print this out to show friends that way they can figure out what car they want. Personally, I like HSD.