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Flandrs

Electric waterpump PWM

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Hi

I'm going to use a electric waterpump that i wan't to run with pwm control as i don't have any possibilties to have a thermostat.

I have a Hella solid state relay

and going to wire it

85 n/c

86 aux 7 pwm

30 + battery

87 + pump

Now to the setup for the ECU, how should i set it up?

What frequency and so on??

Anyone who could help me out with that?

 

startad 2020.pclr

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As for your wiring, pin 30 will need to be connected to a relay that switches on with ignition.  With it connected direct to battery as you propose when the ignition is off you will get a back feed through the ECU.  

As for settings, generally you would set up a GP PWM, set some conditions so it only turns on above a certain temperature, then in the PWM table you would have ECT on one axis and possibly RPM or boost on the other to vary the speed of the pump with temp and load.

Frequency needs to be determined by trial and error, it depends on the motor.  Usualy 100-500Hz will do for a water pump, the motor will sound most happy when you have it right.

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Wiring is Done and working

i have a hella solid state relay

so you think 100hz would be fine? 
The pump is a Davies and Craig 

Thanks for helping me out
 

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9 hours ago, Flandrs said:

so you think 100hz would be fine? 

Yeah I would think around 100-400Hz would be the ballpark it would be happy.

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