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I am trying to design a simple autonomous braking system for a 4 wheel drive ATV. The system needs to be as cheap as possible. I have come up with two possible solutions. The use of a linear Actuator to activate the brake or a stepper motor attached in someway to the master cylinder. It needs to operate quickly and with enough force to completely depress the pedal.

I am having problems with both options due to budget, torque and speed requirements. The force needed to depress the brake pedal fully is 420 Newton’s acting 0.12m away from the pivot point. There are plenty of Linear Actuators that have enough force but I am struggling to find ones that operate fast enough (I understand that there is a trade off, the greater the force the slower the speed). I started to wonder if you could use a stepper motor, but when sourcing one, I again encounter this speed force trade off in the opposite way, steppers are fast enough but I cannot find one with enough torque.

Can anyone suggest another method I have not thought of or a possible solution using one of the two ideas I have proposed?

Any help would be greatly appreciated.

Thanks

M