Thanks for your quick response and idea. I think it is a great idea, but
it would still leave the following problems:

1. Without building a replacement battery management system (BMS), we
don't have an easy way of determining real SOC, so we would not
necessarily know how to adjust perceived SOC relative to real SOC.

We are currently using the spoofed ECU to determine the end-of-charge
point (CAN-View, by the way, is currently incapable of the accurate
integration necessary to do the job of a BMS). We are spoofing the ECU
by increasing the battery voltage by a set amount. We adjust this fixed
additional voltage so that (during trial runs referencing an amp-hour
meter), with continuous spoofing, perceived SOC drops to around 60% --
the point where the hybrid system's average battery throughput drops to
zero -- just when 70-80% of the PHEV battery's charge has been used up.

2. No matter what real SOC is, a major problem is that adjusting
perceived SOC anywhere near 80% automatically causes CCL to decrease
well below 50%, prohibiting EV operations and causing poor drivability.


acranjel wrote:

> From the notes I have read from the website. I thought of this.
>
> Your state of charge or soc loop value is static between certain
> values of the real soc. But what if the value which implements the
> loops were to be dynamic as a function of the real state of charge
> wouldn’t this keep the soc artificially high while still allowing the
> ccl to rise in value when the soc drops? The reason I am asking is
> perhaps by varying the state of charge loop value in proportion the
> real state of charge your perceived state of charge would vary in such
> a way to more efficiently use the Pruis charging mechanism’s ,but only
> as much as the battery pack could take advantage of this. You would
> still have a vehicle that operates like intended but with more
> electric usage when the battery was fully charged and more regen. when
> the real state of charge was low. Ex. Real State of charge would be
> 100% and the loop value for soc would be 80% and when the real state
> of charge is 30% then loop soc would be 60%. Perhaps something along
> these lines would work whether linear or exponential. Maybe one would
> be better than the other.
>
> Let me know if there are problems with this idea or if my thinking is
> flawed.
>
> Alfonzo Ranjel acranjel@... <mailto:acranjel@...>
>
> Alamo City Electric Auto Association
>

--
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Ron Gremban, rgremban@...
California Cars Initiative, a nonprofit organization:
http://www.CalCars.org
Moderator & Technical Lead
http://www.priusplus.org
PRIUS+ PHEV Conversion Group: http://groups.yahoo.com/group/priusplus
Newsletter: http://groups.yahoo.com/group/calcars-news
Do-it-yourself PHEVs: http://www.eaa-phev.org
+++++++++++++++++++++++++++++++++++++++++