A valve control system includes a vehicle control module that generates a
lift mode command signal to transition one of intake and exhaust valves
between N open lift modes. A time module generates a response time signal
that indicates a duration of the transition and a lift limit signal that
disables the transition. The time module generates the response time and
lift limit signals based on current lift mode and status signals. The
current lift mode signal indicates a current lift state of one of the
intake and exhaust valves. The status signal indicates status of a lift
control valve. The lift control valve actuates one of the intake valve
and the exhaust valve. The event module generates the current lift mode
and status signals based on the lift command signal, the response time
signal, and the lift limit signal. One of the time and event modules
enables the transition.