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  1. #1
    SHOBiz's Avatar
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    Operating a Solenoid

    If you have a volt solenoid (AVCR Solenoid?) how can you operate (On/Off) it using the ECU.
    Plan on using a temp reading and if the number > xxx temperature open the valve.


  2. #2
    im unsure of the ecu you intend on using but if it were me id be using the signal to switch a relay then in turn the Solenoid on and off as its safer for the sake of your ecu the last thing you want is a stuck solenoid buring out one of your outputs on your ecu or worse your whole computer

    fuse the relay from the battery if you use one
    also id fuse the signal wire from the ecu to your relay


    give me the following info and ill help you out

    (1) how many milli amps is the solenoid rated at that you intend on useing and what voltage is it im guessing 12volts
    (2) how many times is it going to be opening and closing ......hundreds or thousands each time you run it or just a few
    (3) how many milli amps can your ecu switch and at what output voltage

    cheers trev

  3. #3
    MoTeC Pete's Avatar
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    Quote Originally Posted by SHOBiz View Post
    If you have a volt solenoid (AVCR Solenoid?) how can you operate (On/Off) it using the ECU.
    Plan on using a temp reading and if the number > xxx temperature open the valve.
    Hi ShoBiZ
    Below there is a table from the help menu in the M400 software
    You will see that each of the different drives are capable of different current control, also depending on whether they are high side driving (supplying voltage) or low side drive, grounding voltage.
    First thing to do is measure the resistance of the solenoid, a lot of boost control solenoids are btween 20 and 40 ohms and are easily driven directly by the ECU
    Even if you hook up a 1 ohm solenoid (14 amps) the ECU will self protect and shut down the drive.

    Assuming you have the solenoid connected direct you would wire it to a spare Aux Out put.
    Aux 7 should be free and you would configure it as "#3" a 3D table
    The 3D table can be configured to supply a pulse width signal “PWM” or switch something on and Off.
    In this case it sounds like you want to switch something on or off.
    The table axis can be anything you want, you will often choose RPM on the horizontal axis and in your case temp on the verticle axis.
    You can write any numbers on the axis you want.
    Numbers in the table greater than or equal to 50 will turn the solenoid on,
    You can put the numbers where you want and the relay will switch at the cell where you have entered 50.

    You can also configure a feature called Hysteresis.
    This allows the turn off point to be below the turn on point.
    This means the relay might trigger on at 90 degrees but not off until 80, this is done so that if you happen to sit the engine close to a switching point the solenoid doesn’t chatter on and off
    If you want to use this feature get the system up and running then I will tell you how.

    Cheers




    Auxiliary Output Characteristics



    The following tables list the characteristics for the Auxiliary Outputs, including the Ignition and Injector Outputs when used as Auxiliary Outputs.



    Output


    Low Side Driver


    High Side Driver


    General



    Nominal Max Current (A)


    Min Current Limit


    (A)


    Nominal Max Current (A)


    Min Current Limit


    (A)


    Fly-Back Voltage (V)


    Max Freq (Hz)


    AUX1


    5


    7 *


    5


    7


    Recirculate


    10000


    AUX2


    5


    7 *


    5


    7


    Recirculate


    10000


    AUX3


    1


    3


    -


    -


    60V


    10000


    AUX4


    1


    3


    -


    -


    60V


    10000


    AUX5


    1


    3


    0.7


    0.7 *


    Recirculate


    200


    AUX6


    1


    3


    0.7


    0.7 *


    Recirculate


    200


    AUX7


    1


    3


    0.7


    0.7 *


    Recirculate


    200


    AUX8


    1


    3


    0.7


    0.7 *


    Recirculate


    200


    IGN1


    1


    3


    -


    -


    60V


    5000


    IGN2


    1


    3


    -


    -


    60V


    5000


    IGN3


    1


    3


    -


    -


    60V


    5000


    IGN4


    1


    3


    -


    -


    60V


    5000


    IGN5


    1


    3


    -


    -


    60V


    5000


    IGN6


    1


    3


    -


    -


    60V


    5000


    INJ1


    2


    4


    -


    -


    60V


    5000


    INJ2


    2


    4


    -


    -


    60V


    5000


    INJ3


    2


    4


    -


    -


    60V


    5000


    INJ4


    2


    4


    -


    -


    60V


    5000


    INJ5


    2


    4


    -


    -


    60V


    5000


    INJ6


    2


    4


    -


    -


    60V


    5000


    INJ7


    2


    4


    -


    -


    60V


    5000


    INJ8


    2


    4


    -


    -


    60V


    5000




    Normally the current should not exceed the Nominal Max Current but in some circumstances it may exceed this value for a short period of time as long as it does not exceed the Min Current Limit and as long as the duty cycle is low. The limiting factor is thermal dissipation in the output driver.


    The total maximum low side current should not exceed 15A (all outputs added together).


    The minimum frequency for all outputs is 15Hz (except when used as a switched output).


    Items marked * use a linear current limit, all other outputs shutdown at the current limit.

    Bugger
    that table didnt come out right.
    probably easier to got to the help menu, then topics, then specifications, then Auxilary Outputs.

    Last edited by MoTeC Pete; 03-02-2010 at 01:04 AM. Reason: Table no go

  4. #4

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    THAT................... is amazing!!!
    Is the Motec system the only one to have these sorts of abilities or is all this stuff common thru-out your ECU industry?
    Not pissin in your pocket Pete, just stunned it can to this and more.
    (I have an electronics background, just not very good at it.).

  5. #5
    SHOBiz's Avatar
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    PWM it!! LOL

    Okay, thanks.
    I am still looking for a good solenoid right now. A lot I see I don't trust.

    Plan is to see how the engine cooling kit goes here in a Texas Summer. If the engine reaches a set temp open the valve via the ECU and let the additional water come in.

  6. #6

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    [QUOTE=SHOBiz;1352852]
    I am still looking for a good solenoid right now. A lot I see I don't trust.
    QUOTE]

    You probably know more than me Biz but have you considered a solid state (electronic) relay.
    Less connections to corrode up.
    Easy to wire if you get one with fly leads and has a good IP rating (waterproof).

    Just a thought.


    I'd never use a contact/mechanical relay if there's a way around it.

  7. #7
    MoTeC Pete's Avatar
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    [QUOTE=Gunna;1352997]
    Quote Originally Posted by SHOBiz View Post
    I am still looking for a good solenoid right now. A lot I see I don't trust.
    QUOTE]

    You probably know more than me Biz but have you considered a solid state (electronic) relay.
    Less connections to corrode up.
    Easy to wire if you get one with fly leads and has a good IP rating (waterproof).

    Just a thought.


    I'd never use a contact/mechanical relay if there's a way around it.
    Gunna, thoses SSR's are the go for sure but if his solenoid ends up over 20 ohms in resistance he can wire it direct to the ECU



  8. #8
    SHOBiz's Avatar
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    Well, the solenoid I received today is crap. When you energize it you get flow, but just flow. Way too restricted and you do not even get a 100% seal when closed when just blowing air through it by mouth. Need to get something else. I guess more automotive specific so my requirements have a better chance of being met.

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