The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 24, 1997
Filed:
May. 10, 1995
Nippondenso Co., Ltd., Kariya, JP;
Abstract
An air flow rate control apparatus for an internal combustion engine includes a stepping motor. The stepping motor has a plurality of coils and a rotor which is rotated by energizing the coils. A throttle valve connected to the rotor moves together with the rotor, and controls a rate of air flow drawn into the internal combustion engine. A control device is operative for feeding command currents of first and second command current values to first and second coils among the plurality of the coils respectively, and for controlling a degree of opening of the throttle valve. The first and second command current values correspond to a command degree of opening of the throttle valve at which the control device is intended to control the throttle valve. A direction of a resultant of vector forces generated by the first and second command currents simultaneously fed to the first and second coils corresponds to a held position of the rotor. A magnitude of the resultant of the vector forces corresponds to a magnitude of a hold force of the rotor.