Electric Power Steering Pump Question
I am looking at ways to remove load on the engine of my Jeep while retaining function. I think a good start is going with an electric pump which can be made to work easily. However I want to refine it since most retrofit installs have the pump either off or running 100% which I think will add the load back to the alternator negating gains. I want to be able to vary the amount of voltage based on speeds since I will only need it 90-100% below 25mph and can lower the voltage as speed incrases so cruiseing at highway speeds, the pump will not create load on the motor.
What are options where I can program a PWM output based on a VSS input? I was thinking of using a variable voltage fan controller from a Grand Caravan to regulate voltage to the pump, but I need something to tell it how much voltage to send. |
I don't know, but I'm willing to speculate that an OEM solution would be embedded in a larger system;leaving you the option of an Arduino or Raspberry Pico controller board. And some fairly simple programming.
edit: I've thought about it some more, and the single-board computers I suggested are really overkill. Minimum would be the BASIC Stamp: Quote:
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If you are good at fabricating, consider an electric motor:
https://www.kartek.com/parts/400-wat...ering-kit.html This 400W motor is good for up to 37 inch tires. This is much easier than trying to come up with a completely custom solution in my opinion. |
BASIC stamp; haven't heard that referenced, ever.
That was my introduction to microcontrollers and robotics. Not sure I'd start with power steering pump in my quest to make a Jeep run more efficiently, but it's something. |
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I have not really dealt with programming, but willing to learn. I have very limited hands off understanding of CNC programming. Right now I am running a Holley Terminator where I can setup a PWM table within the tune to accomplish my goal and figure out what works best at what speeds fairly easy. But this is a temporary setup since I will be going with a stock EFI setup next winter and I really doubt I can have a programmable PWM output based on the VSS with that. |
I have experimented with one it's prohibitively expensive for minimum gains.
But if you must I would say forget hydraulics. I bet by now there are off the shelf aftermarket electric power steering rigs for sale somewhere. |
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I second that I would not go the route of replacing a mechanical hydraulic pump with an electric hydraulic pump. Honda integrates a motor into their rack, whereas Toyota integrates it into the steering column. Both use a torque sensor to adjust assist. A lot of people retrofit the Toyota system into other cars.
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An effective electro hydraulic setup is going to suck power. I think mine ran at 50 to 60 amps no load, which was fine for a diesel truck with a big alternator with big alt wires and big batteries.
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