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:
Oct. 04, 2011
Filed:
May. 26, 2009
Seiji Asano, Hitachinaka, JP;
Masanobu Ohsaki, Maebashi, JP;
Takayuki Obu, Isesaki, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A control device for an internal combustion engine can quickly control, regardless of variation of the quantity of evaporative fuel gas adsorbed in a canister of the engine, the air-fuel ratio to a target value by performing air-fuel ratio feedback compensation control so as not to cause the emission performance of the engine to deteriorate. For the first canister purge performed after the engine is started up, a purge valve is driven for a prescribed period at a prescribed purge flow rate. During the period, the quantity of purged fuel is calculated using an air-fuel ratio feedback factor. Based on the fuel quantity thus calculated, an adsorption quantity estimation section estimates the quantity of evaporative fuel gas adsorbed in the canister. At the same time, a fuel evaporation quantity calculation section calculates the quantity of fuel evaporating from a fuel tank according to the condition of the engine and vehicle, and the quantity of fuel in the canister is estimated based on the balance between the quantities of fuel charged to and purged from the canister.