Toyota Jidosha Kabushiki Kaisha

Denso Corporation

Hiroshi Morita

Kazuto Ikeda

Kiyoo Hirose

Kazuhiro Iwahashi

Toshio Asahi

Taisuke Miyamoto

Kimitoshi Murata

Ikuo Marumoto

Nobuyuki Ishihara

Satoru Tojo

Iwao Hibino

An air-fuel ratio control device of an internal combustion engine is provided. The control device includes a learning section, a correction section, and an inhibiting section. When an execution condition is met, the learning section learns, as a deviation amount learned value, a constant deviation amount between a correction amount and its reference value in different manners between a case in which the lift amount of the intake valve is in a first lift amount region used only when the execution condition is not met and a case in which the lift amount is in a second lift amount region used only when the execution condition is met. The learning section computes and stores the relationship between the deviation amount and the lift amount based on the deviation amount learned value. A correction section computes the deviation amount correction value from the stored relationship based on the lift amount, and corrects the fuel injection amount command value using the deviation amount correction value. When there is no record of completing learning of the deviation amount when the lift amount is in the first lift amount region, an inhibiting section inhibits the lift amount from being shifted from the first lift amount region to other lift amount region.

Air to fuel ratio control device

An air-fuel ratio control apparatus includes a learning unit learning amounts of divergence of a correction amount from a reference value thereof respectively as to a plurality of set lift amount regions as divergence amount learning values, a correction unit calculating a divergence amount correction value and correcting a fuel injection amount command value, and a reflection unit reflecting a learning result of the divergence amount learning value of a specific one of the plurality of the set lift amount regions on the divergence amount learning value of another one of the lift amount regions when there is a history indicating that the divergence amount learning value of the specific one of the lift amount regions has been learned and there is no history indicating that the divergence amount learning value of that another one of the lift amount regions has been learned.

Air-fuel ratio control apparatus and air-fuel ratio control method

An air-fuel ratio control apparatus is applied to an internal combustion engine including a variable lift mechanism which changes a lift amount of an intake valve. An oxygen sensor, which outputs a signal indicating an oxygen concentration in exhaust gas, is provided downstream of an exhaust gas purification catalyst in an exhaust passage of the internal combustion engine. Air-fuel ratio control is performed to correct the fuel injection amount command value using the correction amount that is set based on the value output from the oxygen sensor. The relationship among the deviation of the correction amount from its reference value, the learned small lift value, the learned medium lift value, and the lift amount is learned. The learned deviation value is calculated based on the lift amount, using the learned relationship. Then, the fuel injection amount command value is corrected by the correction amount including the calculated learned deviation value.

Air-fuel ratio control apparatus

If it is determined that an engine has been started, an engine coolant temperature is detected. If the engine coolant temperature is equal to or lower than a threshold value, the catalyst quick warm-up control is started to retard ignition timing, and a signal indicating a command to increase an operate angle is transmitted to a VVLA controller. When a VVT hydraulic pressure is increased to a predetermined value, a signal indicating a command to decrease the operate angle is transmitted to the VVLA controller, and a signal indicating a command to advance open timing of an intake valve is transmitted to a VVT controller so that the open timing of the intake valve is not changed. If the engine coolant temperature is equal to or higher than a threshold value, the catalyst quick warm-up control ends, and the ignition timing is returned to normal timing.

Control apparatus and control method for internal combustion engine

An electronic control unit increases the maximum lift amount or the working angle of an intake valve if it is determined that the operation for stopping an engine is performed. The electronic control unit stops fuel injection or ignition before increasing the maximum lift amount or the working angle.

Apparatus and method for controlling internal combustion engine

In the electrode for preventing noise electric wave according to the present invention in which the resistivity of the second layer is larger than that of the first layer, it is possible to prevent the generation of noise electric wave. In the electrode for preventing noise electric wave according to the present invention in which the layer for preventing noise electric wave has the porosity of not more than 20%, it is possible to prevent the radio noise. In the electrode for preventing noise electric wave according to the present invention in which the high-fusing conductive material layer exists between the substrate and the resisting material layer, it is possible to prevent the formation of the concave portion.

Growing community of inventors

Obu, Japan

Hiroshi Morita