Patent ID: 6098594
Filing Date: 2000-08-08
Classification: F02D

Abstract:
An electrically-controlled throttle valve apparatus including a motor, a speed reducing mechanism for reducing the rotation speed that is transmitted from said motor, a throttle valve connected to the speed reducing mechanism, and force applying means for applying a force to the throttle valve in the direction of returning said throttle valve to an initial position and for adjusting the opening of said throttle valve by driving said motor;wherein specification parameters of said motor, said speed reducing mechanism, and said force applying means have values such that the operation time t from the minimum opening to the maximum opening of said throttle valve, which is determined by the following equation (1): ##EQU6## where T.sub.max =K.sub.m E/R.sub.m, and T.sub.s : the preload of a return spring of said force applying means [Nm], T.sub.max : the torque of said motor [Nm], N: the speed-reducing ratio, J: the equivalent moment of inertia [kgm.sup.2 ], K.sub.m : the torque constant [Nm/A], R.sub.m : the resistance of said motor [.OMEGA.], and E: the voltage applied to said motor [V], is shorter than a prescribed target operation time t*.