Variable electric water pump control

[Sprocket]

Has any one succesfuly managed to control an electric water pump variably? Would be nice if VEMS had a singular 0-12v output linked into temp

Failing this what other options are there. PWM?? with an external controller?? what would i need to build the controler.

This is my first stop with this thought so if i seem a little simple its because i havent researched it yet

Any help would be apreciated, In no rush, i can use the on off control for now

Sprox

[dnb]

I would think the on/off will be fine for the moment.  If you're not using the PWM from the boost subsystem then maybe this can be subverted into working with temperature?

Remember that you can't run a centrifugal pump at lower voltage as to slows down and then doesn't pump properly.  It would only work if you have a +ve displacement pump.

[miniminor63]

Hi

my first post on here. I have a meziere electric water pump that is going on my mini, its the smallest type (quite big still though...). I went for it as I do not want to mess around with small bosch pumps from coffeemachines and rely on them to cool my expensive engine.

Anyway I find it dificult to get in contact with meziere, do any of you know if they handle pumping against a thermostat?

here is the general info on it:

WP136
20 GPM flow rate
Single in Single out design (#12AN both sides)
Billet aluminum impeller
Adapter to #8 AN available for common replacement issues
4130 mounting bracket included

and a pic:


is this a centrifugal pump?

I know VEMS will be able to turn it on and off, and I would not like to turn on and off depending on temp as this would cause hot spots due to no circulation so thats okay, but could VEMS make the pump run for say 5 minutes after the engine is shut off?

Thanks!
André

[rob@vems.co.uk]

VEMS will keep the pump running if the water temperature is above the set amount, but once VEMS is turned off the pump will stop.

[miniminor63]

I see. Maybe I could put a timer in to keep power to the VEMS up for say 5 minutes after the engines has run. The A series have quite some problems with heat soak, and its an expensive engine, so would like to avoid it as much as possible.

I think I will keep that temperature limit low then and if it can handle it I'll keep the thermostat for temperature control as I am afraid some parts of the engine will get very hot before water at the location where my sensor is will be...

Thanks!
André

[dnb]

You may be able to do something with VEMS and a light timer relay.  (Vehicle wiring products sell them) 

Get VEMS to turn on this relay as required, but when the ignition goes off the relay will hold power to the pump for a set time.  You could even have this relay feed power to the VEMS so that it persisted for a time so that there was still some form of control on the pump - just make sure that the fuel pump, injectors and ignition are turned off at the key!

[Sprocket]

The Rover MEMS ECU's have this sort of thing built in although its only a few seconds to allow the IAC to close and then re open to its refference table. The ECU is fed by the ignition switch as the live, when it comes live the ECU does. When the engine is started, the Main relay is energised by the ECU, wich provides power to the injectors and ignition coil. At the same time, this same feed also powers the latching circuit within the ECU. The ecu simply holds the main relay energised for a pre determined length of time after the ignition switch is turned off

Idealy the fuel pump output would be able to do this but then how would you control the fuel pump.

The Misc outputs needs a time refference (as well as a temperature refference for emissions purge )