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:
Feb. 18, 2014
Filed:
Nov. 12, 2010
Shigeyuki Urano, Susono, JP;
Shigeyuki Urano, Susono, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
In an internal combustion engine having an in-cylinder pressure sensor provided on each cylinder, an in-cylinder pressure detection value is corrected into an absolute pressure using an absolute pressure correction value Pr by calculating the absolute pressure correction value Pr (=(PV−PV)/(V−V)) from in-cylinder pressure detection values Pand P, in-cylinder volumes Vand V, and a specific heat ratio K at predetermined crank angles θand θduring the adiabatic compression stroke from IVC to the ignition timing. When the adiabatic compression stroke (ignition timing−IVC) is shorter than a predetermined crank angle period CA, the ignition timing is delayed. When the adiabatic compression stroke is longer than or equal to CA, IVC is advanced. Preferably, a torque variation is suppressed by controlling the ignition timing of each cylinder before IVC is advanced.