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boostDR

0-5v output for MAF simulation

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Hi, 

    Is there a way to output 0-5v referenced to MAP ? I want to remove my MAF sensor however the TCU still requires the reference signal.

Kind Regards,

Matt

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Only our Kurofune ECU has analog outputs designed for piggyback type sensor simulations.

If you have one of our other ECU's then you will need to use a GP PWM, and add a basic external circuit with a 5V pullup and a R-C filter to smooth the PWM signal down into an analog looking signal.  Remind me in a day or two when Im back at work I will draw a quick diagram with some recommended values & settings.

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1 minute ago, boostDR said:

Done. Will post up the frequency vs voltage once I do some testing.

The frequency should be fixed at 1000Hz, as above.  Duty cycle is what you vary.  It should work out pretty close to: 0%=0V, 50%=2.5V, 100%=5V.

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I have it set up as GP PMW and 1000hz constant. 

Duty: 100% is 3.3v and 0% is 6.8v 

The PWM output goes to ground at 100% and sits at about 7v at 0%. Wondering if I’m doing something wrong. Can seem to get the required scaling. 

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Ok, modified the cct. Works as expected now, thankyou.  

15 % duty at 1kHz is 5.1v 

84.5% is 0.05v 

response time is ok. You can see a slight ripple at the second decimal point. I might try 4kHz on the weekend and see how it goes. 

 

Matt

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