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:
Jul. 03, 2012
Filed:
May. 14, 2008
Takenobu Yamamoto, Kariya, JP;
Takenobu Yamamoto, Kariya, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
An ECU performs PM removal control, in which the bed temperature of a DPF is adjusted to a target bed temperature through addition of unburned fuel to exhaust gas. In the PM removal control, the ECU learns a learned value of a fuel addition amount by which the difference between the bed temperature and the target bed temperature of the DPF is corrected. When the determination in step Sis positive, in other words, when it is determined that the flow of the exhaust gas to the DPF is in a steady state, the ECU stores a correction value K as a steady state learned value Ka in step S. When the determination in step Sis negative, in other words, when it is determined that the flow of the exhaust gas is in a transient state, the ECU stores the correction value K as a transient state learned value Kb in step S. In the PM removal control, the ECU reflects the transient state learned value Kb in the fuel addition amount. NOx reduction control is carried out based only on the steady state learned value Ka.