Fuel Economy & Emissions Talk about the mileage database, EPA, hypermiling, gas and driving strategy.

[TECHNICAL-HCH] electrical, mechanical controls?

  #1  
Old 07-02-2006, 08:09 AM
bwilson4web's Avatar
Engineering first
Thread Starter
Join Date: Oct 2005
Location: Huntsville, AL
Posts: 5,613
Question [TECHNICAL-HCH] electrical, mechanical controls?

Hi,

I've ordered a "Texas Instrument MSP430 USB Stick Development Tool" that comes with a 16-bit, ucontroller. My plan is to implement hypermiler rules as inputs to the cruise control. I know where the Prius cruise control and other signals run. What I don't know is how the HCH signals and controls operate the vehicle.

How does the HCH cruise control work? Are the operator cruise control signals passed via mechanical, mult-conductor ON-OFF or like the Prius, switching of a resistor network to a control computer? For example, the Prius supports single, pulses from the resistor network to make 1 mph changes.

How is the HCH cruise control turned on-off-suspend? In the Prius, ON and OFF are handled via switching in resistance values to a single ECU input. Suspend is handled by the OR of 'brake', a stalk resistance value, or speeds below 23 mph.

Is there a good HCH control chart that shows how the HCH systems tie together? I've got some in my Prius maintenance manuals but obviously no source for the HCH equivalent. Heck, is there a recommended maintenance guide for the HCH that would show the systems?

The reason I ask is I plan to be fairly open in my ucontroller implimentation. It might be fun to see to what extent this approach could work with the HCH (or other) non-Prius hybrids. Yes, we have a Toyota Echo, a non-gas car, and it is a candidate too but not high on my list. Unlike CNW Marketing, we haven't been driving our Echo very often after we got our hybrid.

Bob Wilson
 
  #2  
Old 07-03-2006, 04:15 AM
Ridiculously Active Enthusiast
Join Date: May 2005
Location: Severna Park, MD
Posts: 1,089
Default Re: [TECHNICAL-HCH] electrical, mechanical controls?

Originally Posted by bwilson4web
How does the HCH cruise control work? Are the operator cruise control signals passed via mechanical, mult-conductor ON-OFF or like the Prius, switching of a resistor network to a control computer? For example, the Prius supports single, pulses from the resistor network to make 1 mph changes.Bob Wilson
The Honda CC also supports pulsed increments/decrements. I have not done any further investigation, but I would head over to driveaccord.com or temple of vtec to ask specifics, and especially for recommendations about which tech manuals are appropriate.
 
  #3  
Old 07-03-2006, 03:11 PM
bwilson4web's Avatar
Engineering first
Thread Starter
Join Date: Oct 2005
Location: Huntsville, AL
Posts: 5,613
Cool Re: [TECHNICAL-HCH] electrical, mechanical controls?

Originally Posted by gonavy
The Honda CC also supports pulsed increments/decrements. I have not done any further investigation, but I would head over to driveaccord.com or temple of vtec to ask specifics, and especially for recommendations about which tech manuals are appropriate.
Since I don't have a Honda hybrid to test with, I was wondering if there was a Honda owner with a mechanical/engineering bend who was interested in sharing information and colaborating on automating their cruise control system. If so, we can design the interface and write the software for the uController with a well defined set of I/O routines that can be modified to deal with the Honda CC as well as the well defined Prius CC interface.

The NHW11 Prius uses switches on a resistor network so I know how to make the uController 'ghost' the CC inputs. But I still have no clue as to how the Honda driver's CC inputs are communicated to the CC controller. Also, we'd need some sort of "load" signal to let the uController know when to 'slack off'.

I guess what I'm askin' is if there is a Honda owner/operator who has the interest and skills to collaborate on a 'smart' CC uController. If so, I'd be happy to share what I'm doing if they will identify and define the equivalent Honda interfaces. This can lead to a somewhat common 'smart' CC uController. At least smart enough that unsophisticated drivers can achieve hypermiler mileage.

Although I know there are non-hybrid dirvers who would be interested in this approach, I'm really interested in seeing what can be done with our Honda, Toyota or other hybrids first. If we can get a smart CC uController working with them, then it will be a proven design that non-hybrid owners can pickup and use.

Bob Wilson
 
Related Topics
Thread
Topic Starter
Forum
Replies
Last Post
SanAntonio Joe
Toyota Camry Hybrid
12
07-08-2010 09:50 AM
acco20
Toyota Camry Hybrid
11
09-28-2007 06:25 PM
SoopahMan
Toyota Prius
35
11-27-2006 06:55 PM
mickster
Honda Civic Hybrid
5
06-05-2006 06:13 PM
Z71
Honda Civic Hybrid
2
02-11-2006 02:30 PM


Thread Tools
Search this Thread
Quick Reply: [TECHNICAL-HCH] electrical, mechanical controls?


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.