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EAA-PHEV

From SeattleEVA
Revision as of 11:58, 24 October 2005 by Rjf (talk | contribs) (→‎EV-Mode)
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This is an Initial Page for the EAA-PHEV Projects. Initially this will focus on the Prius Plus Conversions.

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.

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 be 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.

  • Aftermarket Navigation System Interface (Pioneer's AVIC-88)
  • A $99 BOBIII device from http://www.decadenet.com outputs clean RGBs to the MFD via the CAN-View, it uses serial input to create color text.
  • A $110 CC2RGB converter from http://www.threedoubleyou.com/otherconverters.htm outputs composite NTSC video via the CAN-View.
  • Serial MFD touch screen coordinates are outputted from the CAN-View via a serial rs232 port.

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

Links

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