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:
Jan. 25, 2005
Filed:
Jan. 29, 2003
Kengo Kubo, Yokohama, JP;
Kengo Kubo, Yokohama, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
An internal combustion engine () is provided with a three-way catalytic converter () which purifies exhaust gas, a spark plug () which ignites a gaseous mixture and a throttle () which regulates an intake air flow rate. When the engine () is started, the ignition timing of the spark plug () is retarded based on the difference of the rotation speed Ne from a target idle rotation speed Net. If the engine rotation speed Ne is higher than the target idle rotation speed even after the ignition timing has reached a retard limit, the ignition timing is fixed to the retard limit and the intake air flow rate is reduced through the throttle (), thereby forcing the engine rotation speed Ne to converge rapidly to the target idling rotation speed Net while maintaining the ignition timing at the retard limit to ensure rapid temperature increase in the converter ().