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EAA-PHEV

From SeattleEVA
Revision as of 21:41, 27 October 2005 by Rjf (talk | contribs) (→‎Links: news)
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This is an Initial Page for the EAA-PHEV Projects.
Which will focus on the Prius Plus Conversions for the moment.

Maillist

See the Maillist for past messages and instructions for joining the list.
An archive of the maillist can also be found here http://groups.yahoo.com/group/eaa-phev.
Those who join the group are reminded to observe standard email etiquette and be respectful of each other. The information is provided as a public service and the EAA assumes no liability for its use. Anyone modifying a Prius or other vehicle does so at their own risk and may void their manufacturer's warranty.

In addition to the maillist you can Post any comments, questions, or suggestions you may have to the discussion page, or view the Talk:EAA-PHEV page with the discussion link in the menu at the top of the page.

You do not need to register on this wiki site to join the maillist. However if you intend to contribute to these pages you should create an account and login. Although even this is not strictly required as anyone can edit pages at the moment, it does help keep track of who's changing what, and you get a page of your own!

Disclaimer

  • Use this information at your own risk, there is no warranty expressed nor implied. Even should you perform these modifications to the letter you could still cause damage to any number of components in you Prius and cause it to no longer funcion. In performing some of these modifications you may also void your warrenty with Toyota.
  • HV warning: The Prius Traction Battery is a HV (High Voltage) Battery and could cause serious injury or death if proper precautions are not taken while working with it.

Terms

  • MFD is the Multi-Function Display, or the Touch Screen which is standard on all Prii.
  • CAN is the communications network within the Prius which all the computer systems use to communicate.

EV-Mode

Here is the minimum needed in terms of a computer for spoofing the Prius' built-in BMS:

  • CAN message reading and parsing (CAN bus writing is NOT necessary or even desirable)
  • The ability to separately close and open two reed switch contacts based on CAN information
    • one to set EV-only mode, based on it not already being set, speed <34 mph, power request <120 (out of 200), SOC >49%, and a few other parameters.
    • one to set a voltage boost (to be explained later) to keep perceived SOC within a given range until the battery is sufficiently depleted
  • Amp-hour integration and display from the appropriate CAN bus messages
  • HV battery voltage and current display (both analog and digital desirable) from the appropriate CAN bus messages
  • Display of trip info (since reset): # of CAN errors (important for debugging), odometer, milligallons of gasoline used, Amp-hr and/or kWh used, trip milligallon/mi, Wh/mi, and mpg, highest peak charge and discharge currents, highest and lowest HV battery voltages, and the battery's internal resistance (beginning, current, and end)

Additional displays, desirable but not necessary:

  • Not strictly necessary, but SUPER desirable: storage of CAN trip running data on a removable medium (like a CompactFlash card) for later analysis.
  • Small graphical engine tachometer (but see rectangular suggestion below)
  • Gasoline use rate (milligallon/min and/or milligallon/mi (inverse of mpg), or just a binary for gasoline being used
  • Tiny graphical brake cylinder pressure (sum of that for each wheel), to indicate amount of non-regenerative braking being used

A very cool display would be two rectangular graphs indicating engine and electric power:

  • Engine power (e.g. blue for combustion): vertical: RPM, horizontal: torque
  • Electric (e.g. red for discharge, green for charge): vertical: HV battery voltage; horizontal: HV battery current (absolute value)

The areas can be calibrated so that they show the relative power being produced by the electric motor vs. the engine. The same pair of rectangles could display and compare the power going into regenerative braking vs. that being wasted in the friction brakes.

CAN-View

This is a MFD Intigrated CAN Scanner, named CAN-View.

Additional accessories

These additional features are supported by the 2nd version of the CAN-View, some require additional hardware.

Screenshots

There is a video of it in opperation here http://priuschat.com/index.php?showtopic=11644&st=20#
Screenshots from: http://priuschat.com/index.php?showtopic=11644&st=40#

  • Version2bare1.JPG

    The enhanced version as a bare board.

  • Version2bob.JPG

    With the BOBIII text-video option.

  • Version2plusaccessories.JPG

    With the NTSC video converter option.

  • Version2all.JPG

    With the case it goes in.

  • Version1X3.JPG

    The basic unit bare, assembled and in its smaller box.

  • MFD removed.JPG

    What the dash looks like with the MFD removed to install the M13 cable.

  • Inimenu.jpg

    Initial menu screen.

  • Iniuser.jpg

    User selectable screen.

  • Iniuser2.jpg

    Same showing how you can select your own options.

  • Iniset.jpg

    The set-up screen.

  • Inimech.jpg

    One of the bar-graph screens.

Other CAN scanners

Batteries

  • Any battery which meets the minimum requirements could be used to replace the stock Prius NiMH battery pack. The stock battery does not nesecarily need to be removed, but should probably be disconnected while in PHEV mode.
  • CalCars has used 18 B&B 20Ah 12v SLA PbA batteries from www.electricrider.com
  • EDrive plans on using more exotic 40Ah Li batteries from Valence.

Chargers

File:Prius Charger.jpg
THS Charger
  • CalCars uses a Busha(sp) (link)(model)
  • PFC (bi-directional, reversable)

Links

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