I have an 4x4 which I have heavily modified, the only thing missing is mechanical differential locks. I think it wouldn't be too hard to fit a four channel abs pump from another vehicle and produce my own controller. Which would give me more or less the same ability as diff locks plus a few more features without the hefty price tag. Features I intend to have are.
- Individually locking a wheel on demand (just like fiddle brakes at the touch of a button for all 4 wheels)
- Two potentiometers for automatic control of the amount of slip to allow between left and right wheels.
- Automatic air stop. For detecting front wheel air (on jumps etc)to slow them to a min speed when we detect a run away difference between front and rear.(this will stop breakage of front drive components when they hit the ground).
I plan to monitor wheel speed with 4 hall effect sensors and abs rings fitted to each wheel. The control unit will be an arduino and will count pulses on interrupt.
The electronics and programming side of things I am quite proficient at. The hydraulic side of things no so much.
I understand that these abs pumps have 4 channels and two feeds usually labelled mc1 mc2, I assume one for front and one for rear from the master cylinder. each channel is controlled by a three way valve. This is where my knowledge runs out.
My question then is how are these valves usually controlled in terms of positions and electrical connection?
Whats the maximum / typical frequency these valves actuate at or is it variable depending on rotational speed?