CR-Z has no alternator, is that right ? - Honda CRZ Forum: Honda CR-Z Hybrid Car Forums
 5Likes
  • 2 Post By Spdbump
  • 1 Post By Defiant
  • 2 Post By Serge
 
LinkBack Thread Tools Display Modes
post #1 of 10 (permalink) Old 04-06-2017, 06:37 AM Thread Starter
Newbie
 
Join Date: Mar 2017
Location: U.K. - Surrey/Hampshire
Posts: 28
CR-Z has no alternator, is that right ?

Hi,
Not sure if I have this correct.

But from what I read, the CRZ does not use an alternator to topup and supply 12v to the car.

Instead the IMA battery has a DC-DC converter for this.

Is that correct ? - I was just wondering what would happen if the IMA battery is empty, like after a long hill crawl with foot down.

So maybe this is not correct.

Thanks,
Keith
keithjmason is offline  
Sponsored Links
Advertisement
 
post #2 of 10 (permalink) Old 04-06-2017, 06:56 AM
Super Duper Member
 
Join Date: May 2015
Posts: 2,485
There is no alternator in a conventional sense. The IMA motor charges both the IMA battery and the under hood battery. It also provides the Motor assist when needed. It acts as both a "generator" and a motor. We also have regenerative braking which is another "power" source.

The CR-Z is very smart in how it manages energy and it moves it where it is needed. If there is extra it charges if you need more power to move the vehicle it uses the IMA as a motor. Just cruising along it uses it as a Generator.

I hope this long winded explanation helps your understanding. Others will be more eloquent in their responses.

This is why the under hood battery should be load tested( with the car not running) if you see any electrical oddities because the car prioritizes movement and IMA over the under hood battery charging. Once the car is running most things are using the IMA battery.
Defiant and Aceryl like this.

Last edited by Spdbump; 04-06-2017 at 07:02 AM. Reason: added load testing recommendation
Spdbump is offline  
post #3 of 10 (permalink) Old 04-06-2017, 08:43 AM
Super Duper Member
 
Defiant's Avatar
 
Join Date: Jul 2014
Location: glorious Galt CA
Posts: 1,851
Garage
You'll never run the IMA battery down to nothing- the onboard controls won't let it happen. I'm always surprised when driving up 8000 feet up to Tahoe, under throttle, and the battery gauges showing the IMA is still "Charging". If your amount of throttle is such that the gasoline can maintain your requested power output, the system won't go to "Assist". But this happens without my trying to make it.

Your best bet with the battery indicators is to ignore them. There's nothing going on there for you to be concerned about, as the man behind the curtain is well in control. If you manage to load the system up enough to show the IMA battery "drained", it isn't true.

And yes, the Z has no separate alternator.
Spdbump likes this.
Defiant is offline  
 
post #4 of 10 (permalink) Old 04-06-2017, 02:51 PM
Senior Member
 
rayray's Avatar
 
Join Date: Mar 2013
Location: California
Posts: 404
Garage
the closest thing to an alternator would be the IMA motor as stated by spdbump.

in technical terms it's a stator like those commonly found on motorcycles.

the recovered energy from the flywheel/crank assembly is what acts as the "alternator" in our cars.

'13 CRZ - PWP EX 6MT

mksengineering.com
rayray is offline  
post #5 of 10 (permalink) Old 04-09-2017, 05:27 PM Thread Starter
Newbie
 
Join Date: Mar 2017
Location: U.K. - Surrey/Hampshire
Posts: 28
Thanks everyone. That makes sense.

Cheers,
Keith.
keithjmason is offline  
post #6 of 10 (permalink) Old 04-09-2017, 05:28 PM
Super Duper Member
 
Join Date: May 2015
Posts: 2,485
Quote:
Originally Posted by keithjmason View Post
Thanks everyone. That makes sense.

Cheers,
Keith.
You are very welcome now get off the forum and go drive!
Spdbump is offline  
post #7 of 10 (permalink) Old 04-14-2017, 10:14 PM
Newbie
 
Join Date: Mar 2017
Posts: 10
Quote:
Originally Posted by keithjmason View Post
Hi,
Not sure if I have this correct.

But from what I read, the CRZ does not use an alternator to topup and supply 12v to the car.

Instead the IMA battery has a DC-DC converter for this.

Is that correct ? - I was just wondering what would happen if the IMA battery is empty, like after a long hill crawl with foot down.

So maybe this is not correct.

Thanks,
Keith
An alternator is not required on an hybrid.
A typical alternator has a poor effciency of only about 55%.
The DC-DC converter that replaces it is probably around 90% efficient and much lighter than an alternator.

It's the same thing on the Insight.
I have not check other hybrids but I supposed it's the same.

Serge
litz and Defiant like this.
Serge is offline  
post #8 of 10 (permalink) Old 04-15-2017, 12:27 AM
@ the speed of white
 
litz's Avatar
 
Join Date: Jun 2014
Location: Somerset, OH
Posts: 3,218
Garage

2013 Honda CRZ EX PWP w/navi CVT | Litz's 2013 PWP Build Thread
Sprintex | Mugen | Takeda | Heko | DIY: CVT with 6-Speed shift boot
the speed of sound...the speed of light...the speed of love...the speed of white!
litz is online now  
post #9 of 10 (permalink) Old 04-15-2017, 08:27 AM
Super Duper Member
 
Join Date: May 2015
Posts: 2,485
Quote:
Originally Posted by litz View Post
Video unavailable
Spdbump is offline  
post #10 of 10 (permalink) Old 04-15-2017, 09:22 AM
@ the speed of white
 
litz's Avatar
 
Join Date: Jun 2014
Location: Somerset, OH
Posts: 3,218
Garage
Quote:
Originally Posted by Spdbump View Post
Video unavailable
Oh, but it was a good video too--I'll see if I can find it again.

2013 Honda CRZ EX PWP w/navi CVT | Litz's 2013 PWP Build Thread
Sprintex | Mugen | Takeda | Heko | DIY: CVT with 6-Speed shift boot
the speed of sound...the speed of light...the speed of love...the speed of white!
litz is online now  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Honda CRZ Forum: Honda CR-Z Hybrid Car Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome