Hit-and-Hold Valve Control

[Poofjunior]

Numerous valves cannot be energized and left on at their nominal voltage, or they risk burning up. The solution is a hit-and-hold strategy where the valve is initially energized at it's nominal voltage and then left energized at a reduced voltage that is just high enough to keep the valve energized, but low enough so as not to burn out the solenoid if left on continuously.

We can achieve a simple hit-and-hold strategy using PWM to modulate the output voltage and current sent to the valve and simple state machine to control hit-to-hold transition logic.

We will need hit-and-hold pwm control for all 16 valve outputs.

References

• Hit and Hold Driver Strategy from Lee Co

[Poofjunior]

This is implemented in #4