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:
Apr. 24, 2012
Filed:
Feb. 26, 2008
Hidenori Moriya, Susono, JP;
Ryo Tadokoro, Okegawa, JP;
Hidenori Moriya, Susono, JP;
Ryo Tadokoro, Okegawa, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, JP;
Abstract
A control device of an internal combustion engine that can accurately estimate an NOx concentration in exhaust gas by using a cylinder internal pressure as basic data. A cylinder internal pressure sensor provided to the internal combustion engine detects a cylinder internal pressure P. An internal energy correlation value (ΣV·dP/dθ·Δθ) having correlation with internal energy consumed in the cylinder is calculated based on the cylinder internal pressure Pand an in-cylinder volume V(θ represents a crank angle). The internal energy correlation value is standardized by a load ratio KL, then corrected by a function f(kl) as for a load factor KL so as to calculate an NOx concentration estimated value [NOx]={(ΣV·dP/dθ·Δθ)/KL}×f(kl).