Patent application number | Description | Published |
20080256929 | Internal combustion engine system and control method of internal combustion engine system - Under the condition that a catalyst temperature Tc of a purification catalyst reaches or exceeds a preset reference temperature Tcref, when a cooling water temperature Tw of an engine is not lower than a preset reference temperature Twref, the internal combustion engine system of the invention sets a target exhaust recirculation rate EGR* based on a given rotation speed Ne of the engine and a given load factor KL and performs exhaust recirculation control to open an EGR valve at a specific angle or opening corresponding to the set target exhaust recirculation rate EGR*. When the cooling water temperature Tw is lower than the preset reference temperature Twref, on the other hand, the internal combustion engine system of the invention sets a fuel increment amount a based on the given rotation speed Ne of the engine and the given load factor KL and performs fuel increment control to increase the specific amount of fuel, which is set relative to the amount of intake air to attain the stoichiometric air-fuel ratio as a value to be injected from a fuel injection valve, by the set fuel increment amount α. This arrangement effectively prevents overheat of the purification catalyst while minimizing the deterioration of fuel consumption. | 10-23-2008 |
20080257323 | Internal combustion engine system and vehicle, and ignition control method for internal combustion engine system - When a transient knocking occurrence prediction condition is met, that is, when a cooling water temperature θw is not lower than a threshold value θwref, an intake air quantity Qa is not smaller than a threshold value Qaref, and an intake air quantity difference ΔQa is not smaller than a threshold value ΔQaref (S | 10-23-2008 |
20100076635 | VEHICLE AND CONTROL METHOD OF VEHICLE - Upon satisfaction of the condition for making the malfunction diagnosis at least one of the EGR system, the air-fuel ratio sensor | 03-25-2010 |
20110071748 | CONTROL DEVICE FOR AN ENGINE - In an engine having a variable valve timing mechanism to which an intermittent operation control is applied, appropriate execution of a foreign object removal process for the variable valve timing mechanism is enabled. An engine control device ( | 03-24-2011 |
20110120216 | MALFUNCTION DETERMINATION APPARATUS FOR COOLING APPARATUS AND MALFUNCTION DETERMINATION METHOD FOR COOLING APPARATUS - In a malfunction determination apparatus and a malfunction determination method for a cooling apparatus that cools an internal combustion engine by circulating a cooling medium that flows in a first passage that extends through an inside of the engine, using an electric pump, a first temperature of the cooling medium is detected at an inlet of the first passage, through which the cooling medium flows into the inside of the engine; a second temperature of the cooling medium is detected at an outlet of the first passage, through which the cooling medium flows out from the inside of the engine; and it is determined that the switching valve is able to normally select the second passage, if both of the first temperature and the second temperature reach a first threshold value when a temperature of the cooling medium increases due to start of the engine. | 05-26-2011 |
20110192146 | MULTICYLINDER INTERNAL COMBUSTION ENGINE, INTER-CYLINDER AIR/FUEL RATIO IMBALANCE DETERMINATION APPARATUS, AND METHOD THEREFOR - A multicylinder engine includes: combustion chambers; fuel injection valves corresponding to the individual combustion chambers; an exhaust control catalyst; an upstream-side air/fuel ratio sensor disposed upstream of the exhaust control catalyst; and a downstream-side A/F sensor disposed downstream of the catalyst. A first abnormality determination-purpose rich A/F control of controlling the A/F of the mixture formed in each combustion chamber to an A/F richer than stoichiometric is executed when it needs to be determined whether the downstream-side A/F sensor is abnormal. An inter-cylinder A/F imbalance determination of estimating the A/F of the mixture in each combustion chamber based on the output of the upstream-side A/F sensor is executed when the first abnormality determination-purpose rich A/F control is being executed, and it is determined whether there is a difference between the estimated A/Fs of the mixtures. | 08-11-2011 |
20120046814 | VEHICLE CONTROL APPARATUS - A vehicle control apparatus for a vehicle that includes an internal combustion engine and an electric motor, and that is capable of traveling by motive power from at least one of the internal combustion engine and the electric motor includes: a control portion that causes the vehicle to travel in a travel mode of a plurality of travel modes that differ in an engine start condition for the internal combustion engine; and a determination portion that determines whether exhaust from the internal combustion engine has deteriorated, wherein the determination portion changes the deterioration determination condition for determining that the exhaust has deteriorated, according to the travel mode. | 02-23-2012 |
20130261859 | HYBRID VEHICLE - The hybrid vehicle executes a diagnosis of a component related to exhaust qualities during a fuel-cut operation of the internal combustion engine and generates a fuel-cut request to execute the diagnosis. When the internal combustion engine is operated in an idle state, the hybrid vehicle feedback-controls a throttle valve opening (control parameter) such that an engine rotation speed is maintained at a target idle rotation speed, and learns a value corresponding to the control parameter as a learned value for controlling the idle operation in a state where the vehicle speed is not more than a learning permission vehicle speed and the internal combustion engine is operated in the idle state. The hybrid vehicle continues generation of the fuel-cut request until the learning of the idle operation control learned value is completed. | 10-03-2013 |