Electric water pump control logic

Postby **kranyx** » Mon Nov 14, 2022 3:33 am

I'm running a Pierburg CWA400 water pump where the speed is controlled by a low current PWM output rather than variting the voltage of the high current power supply.

Currently I'm controlling it using an independent controller:
https://www.tecomotive.com/en/products/tinycwa.html

This seems like it would be easy to add control logic for a water pump like this into the haltech.

Both tinycwa and Davies Craig controllers use similair control algorithms where they pulse the pump during warm up to help the car warm up faster with no thermostat, That's the main thing that I think would need special logic. That and I've read the CWA pumps require a "wake up" signial to be sent to them.

Postby **tomeitel** » Thu Dec 22, 2022 7:31 am

I completely agree we need some more electric water pump functionality. it can be used as a post shut down turbo cooler as well and keep water running on that turbo for an extra 5 mins or so post shut down that would be a dream feature for me.

Postby **aus jd 2703** » Thu Dec 22, 2022 8:18 am

you can do that now, you simply set the water pump up as a generic out put with 3D table.
enable turbo timer, then use the ignition switch to trigger the water pump to cool down, you can also adjust how long the motor runs on with the turbo timer and how long it runs just the fans and pump.

i have mine set to run full until coolant temps under 80'c.

Postby **kranyx** » Sat Jan 21, 2023 10:36 am

aus jd 2703 wrote:you can do that now, you simply set the water pump up as a generic out put with 3D table.
enable turbo timer, then use the ignition switch to trigger the water pump to cool down, you can also adjust how long the motor runs on with the turbo timer and how long it runs just the fans and pump.

i have mine set to run full until coolant temps under 80'c.

Yeah, I guess you could run with a turbo timer and the engine run time ratio set to 0%

I could also get the EWP to run after the car shuts down with a PD16, maintaining power to everything for a while and runing the pump at 0 rpm levels (or overide levels)

It also looks like I could use the 0 RPM levels as the "wake up" signal for the pump.

But the pulsing of the pump during warmup is going to be harder to tune in. Might require some timers to be creatively used.