on the basis of a value of a controlled variable provided by the variable valve control means, further comprising a crank angle sensing means for one of sensing and estimating crank angles of the internal combustion engine,
where in the variable valve control means opens the intake valve when a piston is at a position corresponding to a crank angle at which the volume of the combustion chamber of the internal combustion engine is not less than twice the volume of the combustion chamber of the same with the piston at top dead center.