Loading patent…
AssigneesHitachi, Ltd., Hitachi Car Engineering Co., Ltd.
InventorsTakehiko Kowatari, Yuzo Kadomukai, Shigeru Tokumoto, Yasuo Saito, Toshifumi Usui, Masaru Ito
Estimating the term…
An electrically-controlled throttle valve apparatus includes a motor, a speed reducing mechanism for reducing rotation speed transmitted from the motor, a throttle valve connected to the speed reducing mechanism, and a force applying device applying force to the throttle valve in the direction of returning the valve to its initial position and adjusting the opening of the throttle valve by driving the motor. Parameters of the motor, the speed reducing mechanism, and the force applying device have values such that the operation time t from the minimum to the maximum throttle valve opening, which is determined by an evaluation equation obtained from equations of throttle valve motion, is less than a prescribed target throttle valve operation time t*. Furthermore, resistance and an induction voltage constant of the motor are determined to satisfy a constraint equation obtained based on Ohm's law.
An electrically-controlled throttle valve apparatus comprising:
An electrically-controlled throttle valve apparatus comprising:
An electrically-controlled throttle valve apparatus comprising:
Dependencies are inferred from the claim text.
Drawings are temporarily unavailable. Open the PDF at USPTO
From the US filing history. Foreign family members aren’t listed.
Characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance: of the…
A mode being the stratified charge spark-ignited mode: further comprising a homogeneous charge spark-ignited mode
According to or using specific or several modes of combustion: with special control during transition between modes
Controlling combustion engines
Term ended 21 Oct 2018 (estimated)
The present invention relates to an electric-control-type throttle valve apparatus for controlling the amount of intake air in an internal combustion engine.
Japanese Patent Publication 177534/1996 discloses a throttle valve control apparatus including a throttle valve body, a throttle valve installed in the air intake path of the throttle valve body via a rotatable shaft, an actuator for driving the throttle valve via a plurality of gears, and a detection means for detecting the rotation angle of the throttle valve.
The plurality of gears of this apparatus is composed of a first gear fixed to the shaft of the throttle valve, a third gear fixed to the rotation shaft of the motor used as the actuator, and a second gear engaged between the first and third gears. This gear arrangement can increase the speed reducing ratio, which can allow for fine control of the opening of the throttle valve.
FIG. 1 is a horizontal section of an electric-control-type throttle apparatus representing an embodiment according to the present invention.
FIG. 2 is a diagram showing the principle of operation of a default mechanism.
FIG. 3 is a graph showing the force applied to the shaft of a throttle valve by a return spring and a default spring.
Hereinafter, details of various embodiments will be explained with reference to the drawings.
FIG. 1 shows a horizontal section of an electric-control-type throttle valve apparatus representing an embodiment according to the present invention, and FIG. 8 is a front view of a gear portion in the electric-control-type throttle valve shown in FIG. 1, as viewed from the direction of the shaft of the throttle valve.
The electric-control-type throttle valve apparatus comprises a throttle valve body 101 including an air intake path and a motor 107 generating the torque necessary to operate the valve, a motor shaft 105 of the motor 107, a motor gear 106 fixed on the motor shaft 105, a large intermediate gear 104a fixed on an intermediate shaft 109 and engaged with the motor gear 106, a small intermediate gear 104b fixed on the intermediate shaft 109 coaxially with the large intermediate gear 104a, a valve gear 103 engaged with the small intermediate gear 104b, a valve shaft 108 on which the valve gear 103 is fixed, throttle valve members 102 screwed to the valve shaft 108, and a default mechanism using a return spring 112 and a default spring 112 for biasing the valve shaft 8 to a default position.