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Re: Hanging with Victor...EVision description

The diameter of the PCB is 73.5mm, diameter of the analog bar
(outer edges of LEDs) - 58mm. Outside diameter of the enclosure
globe - 79mm. I will update web site with this info and more
detail photos.

John and few others asked to describe features set. Here is quick
rundown for those who haven't looked on the web site:

Measured and displayed parameters:

Traction battery

* Instantaneous voltage, V
* Instantaneous current in or out, A
* Instantaneous power in or out, kW
* Current capacity, Ah
* Current energy, kWh
* Current SOC, %
* Current temperature (highest of 2 zones), ° C
* Indication of direction of battery current, OUT (drive)
or IN (regen or charging)
* Cycle life counter, full cycles
* Battery imbalance detection and measurement

Auxiliary 12V battery

* Instantaneous voltage (V)

Vehicle

* Current vehicle speed, mph
* Energy consumption, Wh/mile and/or miles/kWh
* DTE (Distance to empty) estimation
* TTF (Time to Full) estimation in charging mode
* Indication of charging status (in progress and completed)
* Stock analog fuel gauge driver
* Night time display and HMI dimming
* Sleep mode with wake up on ignition, HMI activation or charge
* Automatic drive/charge/idle mode detection
* No power consumed from onboard auxiliary 12V battery.

Instrument

* Streaming running data out from the galvanically isolated
RS232 serial port (NMEA ASCII format)
* Download and Upload instrument configuration parameters, user
preference, battery and vehicle parameters
* Long retention of internal RTC setup for correct time stamping
without power applied (~ 1 week).

Optional functions are (not implemented in the software yet):

* Tire pressure measurement, all 4 wheels, PSI
* Cruise control
* Power steering control
* Charger, BMS and other subsystems control via I/O expansion module

EVision consists of at least 4 sub-blocks - main controller, HMI (remote
user interface via rotary encoder) shunt measurement PCB and display.
Optional speed sensor is required for efficiency and distance estimation
calculations. Inter-component communication is implemented via CAN bus
(CAN2b protocol, 500 kbps, extended frame IDs).
Front end measurement hardware is based on BRUSA Ah counter shunt and
measurement PCB to maintain backward compatibility with legacy BRUSA Ah
counters. Thus existing BRUSA Ah counter owners can keep their
measurement board with shunt and upgrade only EVision display and main
controller. Display comes in 2 flavors: external in a spherical
enclosure and internal - without enclosure (for in-dash integration).
12V auxiliary battery voltage is monitored, but not used to power
EVision. In fact 12V power doesn't have to be present for proper
instrument operation. The power is supplied directly from the main
traction pack and the power consumed is about 2 W in running mode and
about 300 mW in sleep mode.

Relative SOC level is also outputted through the analog gauge driver as
PWM signal.

1 US models use Imperial units (distance - miles, speed - MPH, tire
pressure - PSI). EU models use metric units (distance - kilometers,
speed - km/h, pressure - bars). Computed values and correct units such
as Wh/mile for US or Wh/km for EU are displayed accordingly.

2 Speed sensor required for accurate energy consumption calculation.
If no sensor is present, default value user inputs during configuration
(say, 230Wh/mile) will be used for calculation of DTE.

Provision for Peukert correction is in the software, but this correction
is not implemented. Instead I use usable capacity concept and straight
Wh consumption calculation. User declares how much capacity he allows to
use and this number is assigned to 100% available capacity.
For instance if you have 50Ah battery (at 1hr rate) and don't want to
discharge deeper than 60% DOD, declare to EVision you have 30 Ah
"usable" capacity. Then, when the battery is full SOC=100% and by the
time 30Ah consumed SOC shows 0% (Ah shows 30Ah consumed) 50Ah is not
"visible" since you don't want to go there. (You can if you have to,
EVision will remain at zero SOC and Ah keep counting).

You can observe any 3 of about 20 monitored parameters at once.
2 with digital readout and one with analog bar. Actually, if you
assign analog bat to display something other than SOC and use stock
fuel gauge for SOC, you can observe 4 parameters).
You can pre-store 20 favorite combinations of any 3 parameters,
(pages") and flip through the pages by rotating encoder button
CW or CCW.

Configuration of pages, alarms, vehicle parameters (wheel diameter,
speed sensor teeth amount), pages, battery parameters and all defaults
are downloaded using simple GUI, but also can be downloaded using any
terminal software (Windows hyper-terminal or Mac Z-terminal).

Main electrical characteristics:

Model M2-RG-US, M2-RG-EU M2-BW-US, M2-BW-EU

Display color Upper digital - green, Upper digital - white,
lower digital - red, lower digital - blue,
analog bar - yellow analog bar - white and blue

As of now only red/green/yellow US version is being made.

Measured battery current range (0.01...250A or 0.02...500A in or out
standard. (Wayland's version is special - 2,500A max :) )

Custom shunts for higher current readout are available. High current
measurement is available at the expense of loosing accuracy on
the low side (charging).
Resolution - 1V on display; 0.1V (I think) out of data port;
1% of the top scale basic accuracy.
Current measurement resolution (100A shunt): 10mA up to 10A,
100mA up to 100A and 1A above 100A, but LSB is not very meaningful
since 1% accuracy is dominating factor. For instance 300V readout
will be up to +/-5V (which is ~1% of 512V top scale).

Measured traction battery voltage 60...512 VDC
Measured aux. 12V battery voltage 0...16 VDC
Measured traction battery capacity 0...999 Ah
Measured traction battery energy storage 0...999 kWh
Measured traction battery relative SOC 0...100%
Measured traction battery power 0...650 kW
Measured temperature -35°C...+99°C,
hottest of 2 points,
Measured battery imbalance 0.5V resolution
(lower half vs. upper)
Full charge cycles counter 0...65535 cycles
Driving efficiency (energy consumption) 0...999 Wh/mile (US),

0...999 Wh/km (EU)
Power supply current (from traction pack),
running mode, no optional expansion module: 6 mA @ 350VDC or
20 mA @100 VDC

Alarms can be set for over/under voltage, over current, under-voltage
of auxiliary 12V battery, under-temperature.

The power steering output actually is not on present model but is
on the next PCB rev. One can modify existing EVision to take advantage
of it when software is in place. It has 2 modes - logic transition
when pre-set speed is reached (cuts out steering pump) or PWM output
reducing duty from near 100% to 0% as speed increases - this can
be fed to the amp running steering pump motor. The motor will
gradually reduce speed as you move faster reducing power assist.

Basically this is it, I can answer specific questions if
anyone has them.

Ah, the price: $550 for the first 10 units to get going (few are
pre-ordered already) and $775 after that. The shunt of your choice is
extra: 100A (0-150A measurement) is $36; 200A (0-500A meas,) is $48
and 500A (0-2,500A meas.) is $69. This info is on the web site
(on the price list).

If you already happen to have BRUSA counter, you pay $215 less by
re-using its shunt and measurement PCB.

--
Victor
'91 ACRX - something different

p.s. I can use help of someone who knows how to write scripts
for reformatting ASCII text (perhaps Perl be the best, but makes
no difference) - actually all people will benefit from it.
The task is to take captured ASCII output and reformat/align
columns of data so that when imported into excel template,
excel produces plots of meaningful parameters. Best script
writer will get $100 discount if he/she wants to buy EVision :),
but the utility should be made available to all for free.
I will provide samples of the captured output.
Any volunteers? Please contact me off list if you care to
enhance usability of this gadget.




Tehben Dean wrote:
> What is the diameter of the face of evision?
> Any more info on power steering control?
>
> On 7/27/07, Joseph T. <[email protected]> wrote:
>> You should put a video of the EVision on youtube!
>>
>> On 7/27/07, Jim Husted <[email protected]> wrote:
>>> --- Victor Tikhonov <[email protected]> wrote:
>>>
>>>> I'll be releasing them for general sale in about 4
>>>> weeks.
>>>> John got to give me a feedback first...
>>>>
>>>> Victor
>>> Hey Victor
>>>
>>> If it can survive Wayland you're golden 8^) I'm
>>> guessing you or Tim put it in or he'd have broke it
>>> already ;^)
>>> Congrats on developing what looks like an awesome
>>> unit, I wish you much success with it and it's a total
>>> win, win, for both you and EVeryone with an EV.
>>>
>>> Anyway I just got this picture of you as you
>>> pondered... who can I get to try and break it, LMAO!
>>> Just one answer, hehe.
>>>
>>> Cya
>>> Jim Husted
>>> Hi-Torque Electric
 

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Discussion Starter #3
Re: Hanging with Victor...EVision description

Victor, did you receive the off-list Email that I sent you?

Bill Dennis
 

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Discussion Starter #4
Re: Hanging with Victor...EVision description

The speed sensor is included as an optional part of the system
if you choose to buy that option. Currently this is the only
config offered - later I will make lite (cheaper) version
with reduced features set. No speed sensor there (and of
course no Eh/mile efficiency data available either).

Victor

Joseph T. wrote:
> How is the speed sensor installed? As you can see, I'm no techie...
>
> On 7/28/07, Victor Tikhonov <[email protected]> wrote:
>> The diameter of the PCB is 73.5mm, diameter of the analog bar
>> (outer edges of LEDs) - 58mm. Outside diameter of the enclosure
 

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Discussion Starter #5
Re: Hanging with Victor...EVision description

Bill, yes I did, will reply.

Victor

Bill Dennis wrote:
> Victor, did you receive the off-list Email that I sent you?
>
> Bill Dennis
>
>
>
 

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Discussion Starter #7
Re: Hanging with Victor...EVision description

The speed sensor itself is about $30. Without it you won't
be able to tell drive efficiency, but you still will see the
power consumption at any time.

Asking not to take it out is like asking not to take useful
navigation system out of Prius while make it "lite" (less
expensive).

This is an option, so if you want it, you just get version with
sensor, I don't see what is the worry. OHOH, few people said -
EVision does too many things for their likes - they would be happy
with $25 Ah raw counter, nothing more. I guess you get
as many opinions as many people you ask.

Lite version will not have speed sensor and also data streaming
ability for those who just want to drive and don't care about
technicality of it. That's the plan. Again, if one doesn't like
spartan version, there is always full featured one.

Victor


Joseph T. wrote:
> "later I will make lite (cheaper) version
> with reduced features set. No speed sensor there (and of
> course no Eh/mile efficiency data available either)."
>
> Just some advice, in my very humble opinion. If I were you, I wouldn't
> get rid of the speed sensor in the lite version (Unless, of course, it
> is a major part of the price.) Anyone who has an EV, will want info
> about its power consumption. Getting rid of the wh/mile, is like
> getting rid of the big mpg display in a hybrid!
>
> On 7/28/07, Victor Tikhonov <[email protected]> wrote:
>> Bill, yes I did, will reply.
>>
>> Victor
>>
>> Bill Dennis wrote:
>>> Victor, did you receive the off-list Email that I sent you?
>>>
>>> Bill Dennis
>>>
>>>
>>>
>>
>
>
>
 

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Discussion Starter #9
Re: Hanging with Victor...EVision description

Victor Tikhonov wrote:

> This is an option, so if you want it, you just get version with
> sensor, I don't see what is the worry. OHOH, few people said -
> EVision does too many things for their likes - they would be happy
> with $25 Ah raw counter, nothing more. I guess you get
> as many opinions as many people you ask.

Oh - I think that was directed at me :) Actually, I was figuring it
would be more like a $100 raw Ah counter, but clearly you got the idea.

> Lite version will not have speed sensor and also data streaming
> ability for those who just want to drive and don't care about
> technicality of it. That's the plan. Again, if one doesn't like
> spartan version, there is always full featured one.

Could you let me know when this version will be entering the testing
stage? I'm most interested. (I got a working speedometer :)

Paul Gooch
 
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