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Coolant Loop Design

2504 Views 26 Replies 4 Participants Last post by  oudevolvo
I'm working on designing my cooling loop. The idea is to control flow via two solenoids to control flow to the original heater core when cold, and to the batteries to warm them on cold days, or bypass these for ordinary cooling. The "battery valve" in the diagram is a 2 way solenoid driven switch, sourcing coolant either from the coolant heater path or not, depending on whether the battery is below ideal temp. Here is a quick, dirty, terrible diagram. My question is am I off base, #1, and #2, what solutions are out there for the coolant heater I've indicated with a question mark below.

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I have used the early, simple, two wire Prius coolant pumps in cooling systems. Prius also has a three-way motorized coolant control valve in the 04-09 Gen 2 models, that I have not used yet:
 

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Looks like that valve may have a motor in it. Any idea how it works, the connection modes, & the pinout?
No idea, at this point. In this video at~8:30, one is taken apart. It's motor driven through a gear train. It looks like it has a simple, electromagnetically activated positioning switch or sensor. Or, it could have Hall sensors. Although, that would probably take more wires?

 

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remy wrote: "Looks like a potentiometer. So there should be a feedback pin, and then a way to forward/reverse the motor".

I hadn't thought of the pot potential(sorry). The valve, from what I understand, controls coolant flow in and out of a thermos that stores hot coolant to aid in rapid warm-up of the gas engine. Also,this apparently provide some cabin heat with the engine off, reduces emissions, engine wear, sludge build-up in the crankcase, etc. Hey, it's an ICE thing! The motor drive along with some kind of position sensor(pot or otherwise) implies some kind of proportional control.
brian, we need a deep dive into this!
 
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