PWM Fuel Pump

Hardware inside and outside of the ECU
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SHOf429
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PWM Fuel Pump

Post by SHOf429 »

There's a bit of discussion on return-less fuel pumps here https://rusefi.com/forum/viewtopic.php?p=35101#p35101 and how to drive them. Ford has a fuel pump driver module (FPDM) in many applications https://www.partsgeek.com/hfd5znt-ford-taurus-fuel-pump-driver-module.html such as a 2000 Taurus.



Here is a Megasquirt using this method. The Ford module accepts a PWM signal in the 25-75% range for normal operation. Outside this is used for diagnostic and error conditions.

I understand FSIO could be used to handle the hardware side, curious about software implementation. This could expand the target audience to include those more modern vehicles that don't have a return line on the fuel system and need "smart" fuel pump control.
Josh
94 Ford Taurus SHO
Frankenso in progress

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AndreyB
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Re: PWM Fuel Pump

Post by AndreyB »

Do we know if that's open loop control or closed loop control (PID?)

For open loop https://github.com/rusefi/rusefi/wiki/rusEFI-project-Advanced#general-purpose-pwm-1 should be nice and easy

For closed loop we have one channel aux PID which is usually used for VVT. It could or should be expanded to multi-channel one day.
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SHOf429
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Joined: Sun May 24, 2020 11:37 pm

Re: PWM Fuel Pump

Post by SHOf429 »

For this application, closed loop would be a must. The Ford uses a vacuum referenced fuel pressure sensor mounted on the rail. https://www.autozone.com/engine-management/fuel-injection-pressure-sensor/ford/escort

PWM on the pump driver is modulated to maintain a 39 psi delta across the injectors under all conditions. Not sure if even a 1D table would be necessary.
Josh
94 Ford Taurus SHO
Frankenso in progress

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AndreyB
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Re: PWM Fuel Pump

Post by AndreyB »

Gotcha.

We have many of the building blocks ready but some code to integrate would be needed. Someone would have to write some code one day.
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kb1gtt
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Re: PWM Fuel Pump

Post by kb1gtt »

I think the prototype could be done with FSIO. Then once it's working, it could be done better with code changes.
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