Hydraulic steering

SteveSFX

Well-known member
Hello all

I have been asked by a friend for some assistance with his hydraulic steering system.

He has been building a mini digger thing (it's totally mad) and the steering is controlled by a 300mm dual action ram.

Up to now, he steers it just by pressing buttons to change the direction.

But, he has asked me to come up with a self centring steering solution using a joystick.

The ram has a 10k feedback pot fitted already. So, my thoughts are a Teensy 4.1 (because I have one) and a couple of Mosfets to control the dual action 24v valve block.

The joystick position can be read and then the ram basically told to attempt to match the reading. Obviously it is going to need some dampening (which I am thinking yo achieve using a trim pot for dialling it in).

Anyone know of any decent Mosfet boards off the shelf?

The valve must be proportional, so run the Mosfet with PWM to adjust the speed?

Seems too simple. I must be missing something
 
To drive the valve, I would consider a two channel motor driver. You could probably find something that will connect directly to the Teensy, and of course it will have PWM. Most likely you will only want to operate in one polarity. You will also need to know voltage and current required to operate the valves.
 
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