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What do you want to see in a SOC meter with larger display ?

Posted: Sat Aug 06, 2011 6:40 pm
by evnow
Assuming we standardize on a 16x2 large format LCD, what do you wan to see displayed ?

In the first line I think we should have
- SOC # (3+1 chars)
- SOC % (4+1 chars)
- 9 chars left

Second line
- anything we want, including scrolling stuff, if we need more than 16 chars


Ideas I have now are
- Range left @ different speeds (like my WinPhone7 app shows, based on Tony's chart)
- Rate of consumption of charge and based on that # of minutes of driving left

ps : I should add - with the AVR-CAN we are using, we can only pull data from one CAN bus - and in our case EV-CAN since we want SOC. Anything in the EV-CAN can be shown (as long as it has been identified).

Re: What do you want to see in a SOC meter with larger displ

Posted: Sun Aug 07, 2011 7:18 am
by TEG
Another request for voltage and pilot signal ampacity when hooked to an EVSE.
(I saw those values as CAN/OBD accessible when I was looking at the service manual.)

Re: What do you want to see in a SOC meter with larger displ

Posted: Sun Aug 07, 2011 7:47 am
by garygid
Can you be more specific where these values are described or found?

Old Service Manual LAN page 33+?

Can you use the CAN-Do progran to identify the data field(s)?

1. Max-Current value specified by the EVSE's Control Pilot.
2. Actual AC input voltage (volts) supplied to the charger.
3. Actual AC current (amps) being drawn by the charger.
4. Actual into-charger ("from-wall") power (watts), and energy (kWh).

Re: What do you want to see in a SOC meter with larger displ

Posted: Wed Sep 07, 2011 11:23 pm
by TEG
I thought I posted those details a while back, but can't seem to find them now.

In any case, I see this:

VC.pdf
VC-17
Freeze Frame Data Item List or Data Monitor Mode
EVSE SIGNAL PULSE WIDTH [us] : Displays the pulse width of the PWM signal being sent from the EVSE.
AC INPUT VOLTAGE [V] : Displays AC input power voltage.

EVSE SIGNAL PULSE WIDTH
AC power: 12 A : 220 us (Approx.)
AC power: 16 A : 250 us (Approx.)
AC power: 30 A : 500 us (Approx.)


LAN.pdf
LAN-37
EVSE PWM Communication signal EV/HEV=Receive OBC=Transmit ( Note, EV/HEV = VCM )

Does that tell you enough?

Image

Re: What do you want to see in a SOC meter with larger displ

Posted: Wed Sep 07, 2011 11:43 pm
by garygid
I believe that the 90% meaning an "Off-Board-Charger" is no longer correct.

Re: What do you want to see in a SOC meter with larger displ

Posted: Thu Sep 08, 2011 10:53 am
by TEG
Yes, that was from the old 1996/Avcon spec.
I think Tesla worked with them to update it so that rates above 50amps (up to about 75amps) are supported with a modified formula.
In any case, I am hoping that someone can read that signal pulse width value over the CAN I/F and display it when charging... (?)