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Thread: 0-5V analog output?

  1. #1

    Default 0-5V analog output?

    I've been digging through the configurable outputs, and it's not clear to me if Holley can output a 0-5V analog signal. I have a brushless pump controller that requires 0-5V (actually 0.5-3.7V) to scale pump speed. Pump explicitly cannot be Pulse Width Modulated. Ideally, I'd like to populate an Advanced 2D RPM/MAP table to control the pump. Has anyone had to do something similar? Worst case I can just wire it to be low/high, or I've found some PWM voltage converters, just trying to keep it simple. Thanks

  2. #2
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    Default

    Here's a copy & paste of some related information:
    Doug Flynn (Holley EFI Chief Engineer):
    You can certainly use an ECU PWM output to drive a solid state relay. The burden of proper operation falls on the pump controller and whether the fuel pump is designed to operate as such. The ECU "can do it", meaning provide a programmable PWM output based on RPM or load or whatever you want to the controller. Most electric pumps are not designed to be pulse width modulated, as far as "turning them on and off"; only have the voltage varied.

    Danny Cabral:

    Contact the manufacturer of your electric motor (fuel pump, water pump, cooling fan, etc.) for the recommended frequency.
    Also, be sure your electric pump or fan is capable of pulse width modulation. Not all electric motors are capable of PWM.
    A PWM electronic controller is required, to convert the PWM signal (from the ECU), into variable voltage to the electrical component.

    Holley HP ECUs do have two programmable "PWM+" & "PWM−" Outputs (or two 12V & ground switched Outputs and four Inputs).
    All Holley ECU Outputs are limited to 2 amps, so an appropriate electronic (solid state) controller is necessary for PWM control.
    FYI: Holley's 554-111 High Current Relay (device/solenoid driver) is not for use as a continuous duty pulsing relay.
    It's rated at 40 amps and can operate at 100% duty cycle continuously or temporarily pulsing (PWM) high currents.
    http://documents.holley.com/199r11304.pdf (NOS 15620NOS Solid State Relay Instructions - See Page 2)

    First, create the custom Output(s) in the I/O ICF. Name it, select PWM+ or PWM−, Enable & Configure it.
    Open PWM Setup. Select "Fixed" Type, "Duty Cycle %" Table Units, and enter the Frequency.
    Configure which two ECU parameters (X & Y axis) you'd like to control the PWM Output Table.
    Then "Pin Map" this new Output to an available J1 pin/connector (see "View Outputs"), and run this wire to the PWM relay.
    May God's grace bless you in the Lord Jesus Christ.
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  3. #3

    Default

    You'd have to put the right amount of capacitance in the wire. The problem with that is it also induces lag.

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