A learning apparatus for a variable valve control of an internal combustion engine
includes a variable valve operating mechanism, an actuator that rotationally drives
the control shaft, a control shaft sensor that detects an angular position of the
control shaft, a reference position determining section that determines whether
or not the control shaft has reached a predetermined reference position under the
drive from the actuator, a learning section that learns an output value of the
control shaft sensor when it is determined that the control shaft has reached the
reference position and stores the learned output value as a sensor output reference
value, and a learning preparing section that causes the control shaft to be driven
by the actuator toward the reference position when a crankshaft of the engine is
rotating and supply of fuel to the engine is stopped. A learning method is also provided.