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Thread: Advance ACD Controller

  1. #1

    Default Advance ACD Controller

    AEM is producing a more advance ACD controller for EVO with the active diff. Pretty much a EMS for your ACD.

    "The ACD is a replacement controller for the Lancer Evo 7/8/9 active diff system. It uses all the same sensors and valves as the original system but uses a completely new strategy. The ACD is a hydraullically controlled system using a small electric pump the product reservoir pressure and a proportional control valve to adjust the controlling pressure. The control pressure is controlled by the wheel speeds, handbrake, footbrake and throttle postition. In addition there are 5 modes of operation: Off, Gravel, Snow Tarmac and Lock."

    Control Strategy
    OFF Cal
    There are 5 CAL modes ( refered to as the Cal )of operation 3 active modes OFF and
    LOCK mode.
    On power up the CAL mode is set by the Default Mode option.
    The values of the Default Mode option are: 0 off
    10 Gravel
    20 Snow
    30 Tarmac
    40 Lock

    Each mode is selected in turn by pressing and releasing the CAL button. OFF Cal is
    indicated by all three of the Cal LEDS on the dash board are off. In OFF Cal the
    accumulator pump is switched off.

    LOCK Cal
    LOCK Cal is indicated by all three mode LEDs being on. In LOCK the demanded
    pressure is set by the LockPRS option. The hand brake can be set to release the lock
    pressure if the Hbrk in lock option is set to ON, in which case the demand pressure
    will be set by the Handbrake press option when the handbrake is operated.
    Active Cals
    The 3 Active Cals Tarmac Gravel Snow are selected in turn by pressing and releasing
    the CAL button. The relevent LED is illuminate to idicate which mode is selected.
    In the active modes the strategy is the same in each mode but the active regime
    calibrations can be different .
    There 5 regimes, START, HANDBRAKE, FOOTBRAKE, ACCEL and DECCEL.
    The current regime is determined by the various system inputs.

    START
    Regime = 36
    The Start regime is selected if the average wheel speed is 0 KPH for 5 seconds.
    The Start regime is exited when average wheel speed is >STARTspd option
    In the Start regime the control pressure is set by the Start Prs table . This table has
    TPSVAL as an input and CNT_DEM pressure as an output. There are 11 sites
    covering the TPSVAL range of 0-100 % in 10% steps. The control pressure can be set
    from 0 to 25 bar.
    The Handbrake can interrupt the Start regime if the Hbrk in Start option is on
    The Start regime is disabled if STARTspd option =0

    HAND BRAKE
    Regime = 12
    The Handbrake regime is selected if the hand brake switch is activated by pulling the
    hand brake leaver. In the Hand brake regime Demand is set by the Handbrake press
    option .

    FOOT BRAKE
    Regime = 20
    The Foot Brake regime is selected if the Brake lights are On ,the Throtle < TPS left
    foot brake option.(Throttle position for left foot braking) and the Hand brake is not
    operated. In Foot brake regime is set by the FBRKprs option. This can be set from 0
    to 25 bar.

    DECCEL
    Regime =24
    The Deccel regime is selected if none of the above regimes are selected and the
    Throttle < CDCLTPS option. In the Deccel regime the pressure is set by one of 3 3D
    look up tables ( SnowD GravelD and TarmacD ) which table is used is set by the
    mode. The mode is set by pressing the Mode switch on the dash board.
    The Deccel look up table has input axis for Slip and Average Wheel Speed (KPH).
    Slip is the difference between Average front wheel RPM and Average rear wheel
    RPM (Fastest – Slowest ).
    The Average wheel speed axis has 8 sites and each site can be to a KPH value of 0 to
    255 KPH. (Site 0 must be the slowest and site 7 the fastest). The Slip axis has 5 sites
    and starts at 0 with steps set by the RPMSTEP option.
    Each site in the table can be set to a Demand value of 0 – 25 bar.

    ACCEL
    Regime = 28
    The Accel regime is selected if none of the above regimes are selected and the
    TPSVAL > CACLTPS option. In the Accel regime the pressure is set by one of 3 3D
    look up tables ( SnowA GravelA and TarmacA ) which table is used is set by the
    mode. The mode is set by pressing the Mode switch on the dash board.
    The Accel look up table has input axis for Slip and Average Wheel Speed (KPH).
    Slip is the difference between Average front wheel RPM and Average rear wheel
    RPM (Fastest – Slowest ).
    The Average wheel speed axis has 8 sites and each site can be to a KPH value of 0 to
    255 KPH. (Site 0 must be the slowest and site 7 the fastest). The Slip axis has 5 sites
    and starts at 0 with steps set by the RPMSTEP option.
    Each site in the table can be set to a CNT_DEM value of 0 – 25 bar.

    Settings
    There are 6 3D look up tables, 3 2D look Up tables, 11 Calibration options and 7
    Control options. Which are all user programmable and must be set for the Control
    Strategy to work correctly.
    The Calibration options set the non control related features of the system

    Here are some more info http://www.roadraceengineering.com/e...r-20V1.011.pdf


  2. #2
    KareBearPowa Guest

    Default Re: Advance ACD Controller

    The telemetry stuff looks interesting. I wonder if they will have a logger for it?

  3. #3

    Default Re: Advance ACD Controller

    You want to try it out?

  4. #4
    KareBearPowa Guest

    Default Re: Advance ACD Controller

    Quote Originally Posted by StockEVO
    You want to try it out?
    Sure, I am always up for more doohickeys.

  5. #5

    Default Re: Advance ACD Controller

    Clitorically speaking? Yes it does telemarketing and such.

    Quote Originally Posted by EarlyApex
    The telemetry stuff looks interesting. I wonder if they will have a logger for it?

  6. Default Re: Advance ACD Controller

    Quote Originally Posted by StockEVO
    You want to try it out?
    Are you guys looking for people to test it?
    www.xperformance.com

  7. #7

    Default Re: Advance ACD Controller

    Is this basically the same as the GEMS unit that has been around for the Subaru's?

    If so that's a pretty slick unit, we used that on some rally cars.

    Mike

  8. #8
    KareBearPowa Guest

    Default Re: Advance ACD Controller

    yea it is from GEMS Mike.

    Isn't the AEM EMS originally from GEMS as well?

  9. #9

    Default Re: Advance ACD Controller

    Not at the moment.

    We got one box from AEM, Scot Gray is going to try it out on his MR and give some feedback to Mike and AEM on it.

  10. #10

    Default Re: Advance ACD Controller

    any word on this product yet???

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