Abstract: Provided is a control apparatus for an internal combustion engine, which quietly restarts the engine with a reduced torque shock when a re-acceleration request is made by a driver.

Abstract: In an air-fuel ratio feedback control device for a fuel injection control system, a catalyst deterioration diagnosing means for carrying out deterioration diagnosis of the catalyst is equipped with a diagnosis permission judging means for judging permission of the deterioration diagnosis of the catalyst on the basis of a driving area of the internal combustion engine, an air-fuel ratio varying means for varying the target upstream air-fuel ratio at the catalyst deterioration diagnosis time, a catalyst deterioration judging means for judging the deterioration of the catalyst on the basis of the downstream air-fuel ratio detection output at the catalyst deterioration diagnosis time, and a catalyst deterioration diagnosis prohibiting means for setting a deterioration diagnosis prohibition time of the catalyst after the catalyst deterioration diagnosis.

Abstract: The present invention provides a control apparatus for an internal combustion engine which can make a determination on fuel property with high accuracy without causing a cost increase. The control apparatus for the internal combustion engine includes: an intake air amount control unit for controlling an intake air amount of the engine; an ignition timing control unit for controlling an ignition timing of the engine; a catalyst heat-up control unit for increasing the intake air amount after cold start of the engine and performing control for retarding the ignition timing; an air-fuel ratio detecting unit for detecting an air-fuel ratio of exhaust gas in the engine; and a fuel property determining unit for making a determination on fuel property through a comparison between a parameter value calculated from the air-fuel ratio and a preset reference value when the catalyst heat-up control unit performs the control for retarding the ignition timing.

Abstract: A control apparatus for an internal combustion engine, where a calculated fuel injection quantity is corrected with a purge-air-concentration learnt value calculated by subjecting a purge air concentration to purge-air-concentration filtering. A filtering effect in the purge-air-concentration filtering is changed in the direction of enhancing exhaust gas purification, when the purge air concentration is thick and when the purge air concentration is thin, whereby an air/fuel ratio introduced into the internal combustion engine is precisely controlled to a target air/fuel ratio so as to enhance the exhaust gas purification.

Abstract: A control device of an internal combustion engine is capable of controlling an air-fuel ratio to be lean based on an activity of oxygen occlusion properties to provide improved three-way catalytic performance. The control device comprises: a three-way catalyst disposed in an exhaust passage of an internal combustion engine; a part for operating a basic fuel injection quantity; a part for operating a compensation amount of a basic fuel injection quantity so that an air-fuel ratio upstream from the three-way catalyst is coincident with a target air-fuel ratio; a part for operating a fuel injection quantity compensated with a basic fuel injection quantity compensation amount; a part for detecting an activity of oxygen occlusion properties of the three-way catalyst; and a part for setting the target air-fuel ratio based on the activity of oxygen occlusion properties.

Abstract: In an air-fuel ratio feedback control device for a fuel injection control system, a catalyst deterioration diagnosing means for carrying out deterioration diagnosis of the catalyst is equipped with a diagnosis permission judging means for judging permission of the deterioration diagnosis of the catalyst on the basis of a driving area of the internal combustion engine, an air-fuel ratio varying means for varying the target upstream air-fuel ratio at the catalyst deterioration diagnosis time, a catalyst deterioration judging means for judging the deterioration of the catalyst on the basis of the downstream air-fuel ratio detection output at the catalyst deterioration diagnosis time, and a catalyst deterioration diagnosis prohibiting means for setting a deterioration diagnosis prohibition time of the catalyst after the catalyst deterioration diagnosis.

Abstract: In a control apparatus for an internal combustion engine, wherein a fuel injection quantity calculated by fuel-injection-quantity calculation means is corrected with a purge-air-concentration learnt value calculated by subjecting a purge air concentration to purge-air-concentration filtering, and wherein fuel in the corrected fuel injection quantity is injected from an injector; a filtering effect in the purge-air-concentration filtering is changed in the direction of enhancing exhaust gas purification, between in a case where the purge air concentration is thick and in a case where it is thin, whereby an air/fuel ratio which is introduced into the internal combustion engine is precisely controlled to a target air/fuel ratio so as to enhance the exhaust gas purification.

Abstract: A device includes: downstream air-fuel ratio feedback control unit that performs feedback control of an upstream target air-fuel ratio so that a downstream air-fuel ratio detected by a downstream air-fuel ratio detecting unit coincides with a downstream target air-fuel ratio; a target air-fuel ratio varying unit that varies the upstream target air-fuel ratio at the time of diagnosing degradation of a ternary catalyst; and a catalyst degradation judging unit that judges catalyst degradation from the behavior of the downstream air-fuel ratio at the time of diagnosing degradation of the ternary catalyst. When diagnosing degradation of the ternary catalyst, the downstream air-fuel ratio feedback control unit is stopped or its control constant is set at a smaller value. Thus, when varying the air-fuel ratio for diagnosing catalyst degradation, interference between downstream air-fuel ratio feedback and upstream air-fuel ratio feedback is prevented and catalyst degradation is accurately diagnosed.

Abstract: At the time of start-up, fuel supply is made excessive. When air-fuel ratio feedback control is started while the fuel is excessive, the control is put into a state of overshoot or hunting, and it takes a long time to converge to the target air-fuel ratio. In an air-fuel ratio control apparatus, a selection switch is provided at the output of an integration calculation circuit to perform air-fuel ratio feedback control, and immediately after start-up of the engine, an upper/lower limit clip value for use immediately after start-up, which is smaller than a normal one, is selected to perform the air-fuel ratio feedback control. Even if the air-fuel ratio feedback control is started immediately after the start-up in a state where the fuel is excessive, the actual air-fuel ratio does not overshoot with respect to the target air-fuel ratio and is quickly converged to the target air-fuel ratio.

Abstract: The present invention provides a control apparatus for an internal combustion engine which can make a determination on fuel property with high accuracy without causing a cost increase. The control apparatus for the internal combustion engine includes: an intake air amount control unit for controlling an intake air amount of the engine; an ignition timing control unit for controlling an ignition timing of the engine; a catalyst heat-up control unit for increasing the intake air amount after cold start of the engine and performing control for retarding the ignition timing; an air-fuel ratio detecting unit for detecting an air-fuel ratio of exhaust gas in the engine; and a fuel property determining unit for making a determination on fuel property through a comparison between a parameter value calculated from the air-fuel ratio and a preset reference value when the catalyst heat-up control unit performs the control for retarding the ignition timing.

Abstract: A control apparatus for the internal combustion engine includes a fuel cut post-return fuel increasing correction unit for performing a fuel increasing correction during a specified period when a fuel supply stop state by an fuel cut control unit is returned to a fuel supply state, and a fuel increasing correction stop unit which compares an integrated value of an amount of air flowing into a three-way catalyst during a period of the fuel supply stop with an integrated value of an amount of air flowing into the three-way catalyst during the fuel increasing correction after a fuel supply return, and stops the fuel increasing correction of the fuel cut post-return fuel increasing correction unit when a comparison value reaches a specified value.

Abstract: A control device of an internal combustion engine is capable of controlling an air-fuel ratio to be lean based on an activity of oxygen occlusion properties to provide improved three-way catalytic performance. The control device comprises: a three-way catalyst disposed in an exhaust passage of an internal combustion engine; a part for operating a basic fuel injection quantity; a part for operating a compensation amount of a basic fuel injection quantity so that an air-fuel ratio upstream from the three-way catalyst is coincident with a target air-fuel ratio; a part for operating a fuel injection quantity compensated with a basic fuel injection quantity compensation amount; a part for detecting an activity of oxygen occlusion properties of the three-way catalyst; and a part for setting the target air-fuel ratio based on the activity of oxygen occlusion properties.

Abstract: A device includes: downstream air-fuel ratio feedback control unit that performs feedback control of an upstream target air-fuel ratio so that a downstream air-fuel ratio detected by a downstream air-fuel ratio detecting unit coincides with a downstream target air-fuel ratio; a target air-fuel ratio varying unit that varies the upstream target air-fuel ratio at the time of diagnosing degradation of a ternary catalyst; and a catalyst degradation judging unit that judges catalyst degradation from the behavior of the downstream air-fuel ratio at the time of diagnosing degradation of the ternary catalyst. When diagnosing degradation of the ternary catalyst, the downstream air-fuel ratio feedback control unit is stopped or its control constant is set at a smaller value. Thus, when varying the air-fuel ratio for diagnosing catalyst degradation, interference between downstream air-fuel ratio feedback and upstream air-fuel ratio feedback is prevented and catalyst degradation is accurately diagnosed.

Abstract: At the time of start-up, fuel supply is made excessive. When air-fuel ratio feedback control is started while the fuel is excessive, the control is put into a state of overshoot or hunting, and it takes a long time to converge to the target air-fuel ratio. In an air-fuel ratio control apparatus, a selection switch is provided at the output of an integration calculation circuit to perform air-fuel ratio feedback control, and immediately after start-up of the engine, an upper/lower limit clip value for use immediately after start-up, which is smaller than a normal one, is selected to perform the air-fuel ratio feedback control. Even if the air-fuel ratio feedback control is started immediately after the start-up in a state where the fuel is excessive, the actual air-fuel ratio does not overshoot with respect to the target air-fuel ratio and is quickly converged to the target air-fuel ratio.

Abstract: A control apparatus for an internal combustion engine can detect degradation of a three-way catalyst with high accuracy without causing deterioration in an exhaust. A pair of first and second air fuel ratio detectors are disposed in an exhaust system at locations upstream and downstream of the three-way catalyst for detecting a first and a second air fuel ratio of an exhaust gas. A target oxygen change amount calculator calculates a target oxygen change amount of the three-way catalyst, and an oxygen change amount calculator calculates an oxygen change amount of the three-way catalyst from an amount of exhaust gas passing through the three-way catalyst and the first air fuel ratio. An air fuel ratio operator inversely controls the air fuel ratio to a rich side and a lean side with a prescribed air fuel ratio width each time the oxygen change amount reaches a target oxygen change amount.

Abstract: A control apparatus for an internal combustion engine can detect degradation of a three-way catalyst with high accuracy without causing deterioration in an exhaust. A pair of first and second air fuel ratio detectors are disposed in an exhaust system at locations upstream and downstream of the three-way catalyst for detecting a first and a second air fuel ratio of an exhaust gas. A target oxygen change amount calculator calculates a target oxygen change amount of the three-way catalyst, and an oxygen change amount calculator calculates an oxygen change amount of the three-way catalyst from an amount of exhaust gas passing through the three-way catalyst and the first air fuel ratio. An air fuel ratio operator inversely controls the air fuel ratio to a rich side and a lean side with a prescribed air fuel ratio width each time the oxygen change amount reaches a target oxygen change amount.

Abstract: An air-fuel ratio control device of the present invention is equipped with an upstream side air-fuel ratio sensor which is disposed in a passage at the upstream side of a three way catalyst and detects an air-fuel ratio of an engine, a downstream side air-fuel ratio sensor which is disposed in a passage at the downstream side of the three way catalyst and detects an air-fuel ratio after passing through the three way catalyst, and ECU.

Abstract: A control apparatus for the internal combustion engine includes a fuel cut post-return fuel increasing correction unit for performing a fuel increasing correction during a specified period when a fuel supply stop state by an fuel cut control unit is returned to a fuel supply state, and a fuel increasing correction stop unit which compares an integrated value of an amount of air flowing into a three-way catalyst during a period of the fuel supply stop with an integrated value of an amount of air flowing into the three-way catalyst during the fuel increasing correction after a fuel supply return, and stops the fuel increasing correction of the fuel cut post-return fuel increasing correction unit when a comparison value reaches a specified value.

Abstract: A vehicle key system comprises a mobile transmitter including a fingerprint information capturing unit for capturing fingerprint information from a user's fingerprint, and a transmit unit for transmitting the fingerprint information captured by the fingerprint information capturing unit together with a system-specific identifier. A receiver disposed in a vehicle includes a receive unit for receiving the fingerprint information and the identifier transmitted from the transmit unit of the mobile transmitter, a verification unit for verifying the fingerprint information against a list of pieces of previously stored fingerprint information, and for verifying the received identifier against a previously stored identifier, and a control unit for controlling pieces of equipment in the vehicle according to verification results from the verification unit.

Abstract: A vehicle key system includes a fingerprint verification unit for verifying identity of fingerprint information captured by a fingerprint information capturing unit by comparing it with a list of pieces of fingerprint information about fingerprints of authorized users stored in a fingerprint information storage unit. A manipulation detection unit can detect at least one of a predetermined manipulation of an operation unit, such as a wiper switch, a winker switch, or a shift lever, and a predetermined manipulation of a pedal, such as an acceleration pedal, a brake pedal, or a clutch pedal. A processing mode switching unit can switch between a plurality of processing modes according to the predetermined manipulation detected by the manipulation detection unit.