PWM Fuel Pump Speed Control

[immortality]

Awesome. would be very handy.

[immortality]

have you made up a module or a circuit that can be copied?

[Holden202T]

perfect results!

[VL400]

At the moment its just a thrown together circuit with a pair of MOSFETs from the parts draw. But I am going to be using a BTN7960B (http://www.infineon.com/cms/en/product/ ... e9554e00da) as I have a few of them.

I want a drop in replacement of the current mechanical relay. The issue with all solid state relays that I could find is they are not high side drivers (the fuel pump is supplied with switched 12V), a low side driver is supplying a ground and is the common switching method with solid state devices. The ones I tried that say they do a high side drive, do not and just get toasty.

[immortality]

If you go as far as making up a little pcb/module I'd be keen for one.

[VL400]

No problem, will keep this thread updated with the driver board.

[OZ38]

Reading all your info here is handy for me as I have recently fitted a larger pump to my VS V6 via surge tank set up. I notice the fuel pressure runs at around 46.5 psi now at idle where as before with just stock pump it was around 34 - 36 psi. So figure like you did the reg is being over pressured.

So to digress a little with what you have found out. What does the s/c L67 fuel pump controller do when inline with the L67 ecu/pcm to control the fuel pump duty cycle. I know that set up would run at either 100% duty or back down at 66% duty.
Where as here you have played with & changed code & not used a fuel pump controller as is fitted to the VS - VX s/c V6 models of Commodores ?
(Purposely left the VY model out as some later L67's did not have the fuel pump controller fitted).

Cheers

[OZ38]

I want a drop in replacement of the current mechanical relay. The issue with all solid state relays that I could find is they are not high side drivers (the fuel pump is supplied with switched 12V), a low side driver is supplying a ground and is the common switching method with solid state devices. The ones I tried that say they do a high side drive, do not and just get toasty.

Or is this above what the L67 fuel pump controller is & how it works ?

Cheers

[Holden202T]

yeah i'd definitely be keen to try one too, as you know in the past my attempts at fuel pump speed controllers did get toasty with the 2 x 044's!

[VL400]

Reading all your info here is handy for me as I have recently fitted a larger pump to my VS V6 via surge tank set up. I notice the fuel pressure runs at around 46.5 psi now at idle where as before with just stock pump it was around 34 - 36 psi. So figure like you did the reg is being over pressured.

So to digress a little with what you have found out. What does the s/c L67 fuel pump controller do when inline with the L67 ecu/pcm to control the fuel pump duty cycle. I know that set up would run at either 100% duty or back down at 66% duty.
Where as here you have played with & changed code & not used a fuel pump controller as is fitted to the VS - VX s/c V6 models of Commodores ?
(Purposely left the VY model out as some later L67's did not have the fuel pump controller fitted).

Cheers

Certainly sounds like you are exceeding the reg return. For 11P I have a table of RPM vs MAP and can adjust the DC, which a MOSFET circuit PWMs the actual pump.

Settings.png (22.68 KiB) Viewed 4939 times

The factory method is a two speed setup, they look at fuel flow and if it exceeds a set point goes to high speed. The PCM sends a PWM signal to the fuel pump controller but I dont know if that then PWMs the pump or just switches in a series resistor to run the pump at a lower voltage and hence lower speed (Toyota do it this way).

yeah i'd definitely be keen to try one too, as you know in the past my attempts at fuel pump speed controllers did get toasty with the 2 x 044's!

The new controller uses a driver designed for the task so hopefully should work a bit better than an SSR. Will keep you posted!