I previously asked about fuel pump closed loop control, and I received a couple of helpful answers. But what I’ve just worked out is that the pump (a GM ZL1 pump) draws 15-17A. The Pro’s bridges are rated at 7.5A. Is there a solution using a PMU (I’m using the ECUMaster PMU 16-AS)? Or has anybody done something cool with a MOSFET or a solid state relay that they’d share? Or is there another answer?
Many thanks!
Hi,
It will probably be too much of a load for the PMU to handle with PWM.
A solution from us would be to use a Dual H-bridge module. You can use those two bridges in parallel to achieve a constant current capability of 20 A with high-frequency PWM. The duty cycle can be controlled from EMU PRO using CAN data.
I don’t have experience with SSRs, so I am unable to recommend anything here.
Hi Marek, thanks. Can you provide a bit more detail how one would wire that using your dual H-bridge? thanks!
It’s a standard motor control with an H-bridge.
To use both bridges in parallel, you connect output 1A with 2A together, and that goes to the positive side of the motor. Next, you connect 1B with 2B, and that goes to the negative side of the motor.
Other than that, you connect the power supply and CAN bus.
That’s it.
Seems pretty simple. I’ll get one coming from ECUMaster USA. Thanks.