Abstract: A plurality of intake air amount control systems are provided for diagnosing a failure of each intake air amount control system. At the failure of any of them, a fail-safe control is performed using a normal intake air amount control system.

Abstract: When controlled variable in a variable valve event and lift mechanism is made to be a predetermined value, requested closing timing at which a target air amount can be obtained and requested opening timing at which a target residual gas rate can be obtained are calculated, and the controlled variable is changed in stepwise until an absolute value of a deviation between a requested operating angle at the requested closing timing and the requested opening timing, and an operating angle corresponding to the controlled variable, reaches a predetermined value or less, so that the controlled variable of the time when the absolute value of the deviation reaches the predetermined value or less is set to a desired value.

Abstract: A system for performing stroke determination and cylinder determination by using intake pressure as a parameter, in order to provide a stroke determination system for a four stroke cycle engine by which accurate determination can be achieved.

Abstract: Gains of a feedback control of a variable valve mechanism are varied so that a response delay occurs. As a result that a transient response is diagnosed under this state, in the case where the occurrence of response delay is not judged, it is judged that a response diagnosis function is abnormal.

Abstract: A requested volume flow ratio calculated based on a requested torque, an amount of two times a spit-back gas amount at the valve overlap time calculated based on a requested residual gas rate, and a spit-back gas amount of the time when an intake valve is closed are added together, to set a requested valve passing gas amount of the intake valve, thereby determining a target operating characteristic of the intake valve based on the requested valve passing gas amount.

Abstract: In an internal combustion engine, which is provided with a variable valve mechanism that varies an open/close characteristic of an intake valve, a target open/close characteristic of the intake valve is determined. Simultaneously, a control speed at a time when the intake valve is controlled to have the target open/close characteristic is determined. As a result, the variable valve mechanism is controlled according to the target open/close characteristic and the control speed.

Abstract: To enable restart of an engine by detecting that a vehicle is restored to the upright position after overturning in an early state. An acceleration sensor having a detection axis laid laterally of a vehicle body is integrated into an ECU and mounted on the vehicle body. Outputs of the acceleration sensor are weighted and averaged, and when an average value exceeds an overturn threshold repeatedly, an overturn determination unit determines that the vehicle is overturned. On the other hand, when outputs of the acceleration sensor are determined to be below a restoration threshold, and the determination is repeatedly made, it is determined that the vehicle is restored from the overturned state. The engine is stopped when determination of overturn is made, while restart of the engine is enabled when determination of restoration is made. Especially, the reference value of determination is set so that determination of restoration is made at an early stage.

Abstract: A centric phase of an operating angle of an engine valve is detected on the basis of an interval between a reference rotational position of a crankshaft and a reference rotational position of a camshaft, and on the other hand, the centric phase is detected at a period shorter than a period between the reference rotational positions, and one of those detected results is selected on the basis of a predetermined regulation, and an opening characteristic of the engine valve is operated on the basis of the selected centric phase.

Abstract: A requested volume flow ratio calculated based on a requested torque, an amount of two times a spit-back gas amount at the valve overlap time calculated based on a requested residual gas rate, and a spit-back gas amount of the time when an intake valve is closed are added together, to set a requested valve passing gas amount of the intake valve, thereby determining a target operating characteristic of the intake valve based on the requested valve passing gas amount.

Abstract: A centric phase of an operating angle of an engine valve is detected on the basis of an interval between a reference rotational position of a crankshaft and a reference rotational position of a camshaft, and on the other hand, the centric phase is detected each predetermined time, and a Variable valve Timing Control mechanism is feedback-controlled on the basis of a value which has been updated more recently between both detected results.

Abstract: In an internal combustion engine, which is provided with a variable valve mechanism that varies an open/close characteristic of an intake valve, a target open/close characteristic of the intake valve is determined. Simultaneously, a control speed at a time when the intake valve is controlled to have the target open/close characteristic is determined. As a result, the variable valve mechanism is controlled according to the target open/close characteristic and the control speed.

Abstract: In an internal combustion engine provided with a variable valve mechanism that variably controls at least an operating characteristic (valve lift amount and the like) of an intake valve, a valve opening area AWm at a valve overlap time is calculated based on a valve lift amount (VCS-ANGL) and opening timing IVO of the intake valve, and a spit-back gas amount Wm at the valve overlap time is calculated based on the valve opening area AWm. On the other hand, a volume flow ratio (basic actual engine volume flow ratio) RQH0VEL1 in the intake valve, equivalent to an actual intake air amount of the engine, is calculated based on the valve lift amount and closing timing of the intake valve, and a basic residual gas amount Wcyl is calculated based on the basic actual engine volume flow ratio RQH0VEL1. Then, a resultant obtained by adding the spit-back gas amount Wm and the basic residual gas amount Wcyl, is set as a total residual gas amount of the engine.

Abstract: A photochemical hole burning medium is composed of a material in which a rare earth complex and a reducing agent is dispersed in a solid matrix. The rare earth complex may be at least one complex selected from the group consisting of a europium (III) crown ether complex, a europium (III) polyether complex, and a europium (III) cryptand complex.

Abstract: In an internal combustion engine provided with a variable valve mechanism that varies an open/close characteristic of an intake valve, a target open/close characteristic of the intake valve is determined and at the same time, a control speed of when the intake valve is controlled to have the target open/close characteristic is determined, so that the variable valve mechanism is controlled according to the target open/close characteristic and the control speed.

Abstract: In a control apparatus for controlling an intake air amount of an engine by variably controlling a lift amount of an intake valve, when a variable valve lift mechanism is failed, the control is switched to a control of the intake air amount based on an opening degree of a throttle valve, and also the opening degree of the throttle valve is restricted within an upper limit value in order to ensure a negative pressure utilized by a brake booster.

Abstract: A valve timing control apparatus for an internal combustion engine which comprises a variable valve timing mechanism which varies an opening-and-closing timing of an intake valve and/or an exhaust valve of an engine, and in which the opening-and-closing timing at a time of starting the engine is set to a starting time timing which is at a further advance side than a maximum retard timing which is retarded at the maximum, said apparatus characterized in that, at a time of stopping the engine, the variable valve timing mechanism is controlled such that the opening-and-closing timing is made to be the starting time timing.

Abstract: A centric phase of an operating angle of an engine valve is detected on the basis of an interval between a reference rotational position of a crankshaft and a reference rotational position of a camshaft, and on the other hand, the centric phase is detected at a period shorter than a period between the reference rotational positions, and one of those detected results is selected on the basis of a predetermined regulation, and an opening characteristic of the engine valve is operated on the basis of the selected centric phase.

Abstract: A centric phase of an operating angle of an engine valve is detected on the basis of an interval between a reference rotational position of a crankshaft and a reference rotational position of a camshaft, and on the other hand, the centric phase is detected each predetermined time, and a Variable valve Timing Control mechanism is feedback-controlled on the basis of a value which has been updated more recently between both detected results.

Abstract: When a variable valve mechanism which varies an opening characteristic of an engine valve is malfunctioned, the power supply to a drive circuit for the variable valve mechanism is stopped, and also a control signal to the drive circuit is cleared.

Abstract: When it is detected that any one of a plurality of variable valve characteristic mechanisms disposed for every cylinder groups is failed, an effective opening degree (valve lift amount, valve operating angle or the like) in a valve characteristic in the failed state, is obtained. When the effective opening degree is judged to be a predetermined value or above, the valve characteristic of the normal variable valve characteristic mechanism is controlled to be coincident with the valve characteristic in the failed state. When the effective opening degree is judged to be less than the predetermined value, there is performed a control for limiting the control to coincide the valve characteristic of the normal variable valve characteristic mechanism with the valve characteristic in the failed state.