Abstract: A valve timing correction control apparatus for an internal combustion engine is provided. The engine includes a plurality of banks and variable valve operating mechanisms disposed at the respective banks for variably controlling valve timings of intake valves separately at the respective banks. The valve timing correction control apparatus comprises air/fuel ratio sensors provided to exhaust systems of the respective banks, and a control unit that corrects the valve timings of the intake valves at the respective banks in accordance with deviations of air/fuel ratios detected by the respective air/fuel ratio sensors. A valve timing correction control method is also provided.

Abstract: A variable valve control system for an internal combustion engine, includes a valve to open and close an opening of a combustion chamber of the engine, a variable lift characteristic control mechanism to adjust a valve lift characteristic of the valve, a sensing section to collect information needed to determine an estimated valve lift characteristic of the valve, an input section to receive an externally input calibration-mode command. The variable valve control system is configured to perform: controlling the valve lift characteristic to be a mechanically defined small setting in response to the calibration-mode command; collecting the information when the valve lift characteristic is the small setting; and calibrating the sensing section in accordance with the collected information.

Abstract: In digital data counterfeit detecting program, apparatus, and method, an address arithmetic processing is performed for a value of one of a plurality of digital data which is stored in each of addresses, a result of the address arithmetic processing performed for the value of the one of the digital data representing one of the addresses and a predetermined arithmetic processing is executed for the value stored in each of the addresses which are the respective results of the address arithmetic processing to calculate a collation value used for a digital data counterfeit detection.

Abstract: In variable valve control system and method for a vehicular multi-cylinder internal combustion engine, a first learning timing at which a reference position of a lift characteristic is learned for a first cylinder group is deviated from a second learning timing at which the reference position is learned for a second cylinder group.

Abstract: An intake air control apparatus method and apparatus for an internal combustion engine in which the engine includes a variably operated valve mechanism for making at least one of an operating angle of an intake valve and a valve lift thereof variable. A determination is made on whether a deceleration fuel supply cutoff condition to cutoff the fuel supply to the engine is established. A fuel supply cutoff control is carried out when the deceleration fuel supply cutoff condition is established, and at least one of the operating angle of intake valve and the valve lift thereof is reduced by the variably operated valve mechanism to a predetermined extreme minimal value before the fuel supply cutoff control is started in a state in which the deceleration fuel supply cutoff condition is established.

Abstract: A learning apparatus for a variable valve control of an internal combustion engine includes a variable valve operating mechanism, an actuator that rotationally drives the control shaft, a control shaft sensor that detects an angular position of the control shaft, a reference position determining section that determines whether or not the control shaft has reached a predetermined reference position under the drive from the actuator, a learning section that learns an output value of the control shaft sensor when it is determined that the control shaft has reached the reference position and stores the learned output value as a sensor output reference value, and a learning preparing section that causes the control shaft to be driven by the actuator toward the reference position when a crankshaft of the engine is rotating and supply of fuel to the engine is stopped. A learning method is also provided.

Abstract: A variable valve control system for an internal combustion engine including a plurality of cylinders, the variable valve control system including a variable lift characteristic control mechanism to adjust a valve lift characteristic of each of intake valves.

Abstract: In variable valve control system and method for a vehicular multi-cylinder internal combustion engine, a first learning timing at which a reference position of a lift characteristic is learned for a first cylinder group is deviated from a second learning timing at which the reference position is learned for a second cylinder group.

Abstract: A variable valve control system for an internal combustion engine, includes a valve to open and close an opening of a combustion chamber of the engine, a variable lift characteristic control mechanism to adjust a valve lift characteristic of the valve, a sensing section to collect information needed to determine an estimated valve lift characteristic of the valve, an input section to receive an externally input calibration-mode command. The variable valve control system is configured to perform: controlling the valve lift characteristic to be a mechanically defined small setting in response to the calibration-mode command; collecting the information when the valve lift characteristic is the small setting; and calibrating the sensing section in accordance with the collected information.

Abstract: A learning apparatus for a variable valve control of an internal combustion engine includes a variable valve operating mechanism, an actuator that rotationally drives the control shaft, a control shaft sensor that detects an angular position of the control shaft, a reference position determining section that determines whether or not the control shaft has reached a predetermined reference position under the drive from the actuator, a learning section that learns an output value of the control shaft sensor when it is determined that the control shaft has reached the reference position and stores the learned output value as a sensor output reference value, and a learning preparing section that causes the control shaft to be driven by the actuator toward the reference position when a crankshaft of the engine is rotating and supply of fuel to the engine is stopped.

Abstract: A first compressor (1a) which supercharges intake air is provided in the intake passage (6, 20, 21) of an internal combustion engine (12). The first compressor (1a) is driven by the exhaust gas energy of the engine (12). A second compressor (2a) driven by an electric motor (2b), and a bypass valve (3) which bypasses the second compressor (2a), are provided in the intake passage (7, 20, 21) between the first compressor (1a) and the engine (12). The bypass valve (3) shifts from the open state to the closed state according to the operation of the second compressor (2a). At this time, the bypass valve (3) starts closing at some time after startup of the second compressor (2a) so that the intake air amount of the engine (12) is not deficient.

Abstract: A variable valve control system for an internal combustion engine including a plurality of cylinders, the variable valve control system including a variable lift characteristic control mechanism to adjust a valve lift characteristic of each of intake valves.

Abstract: A valve timing correction control apparatus for an internal combustion engine is provided. The engine includes a plurality of banks and variable valve operating mechanisms disposed at the respective banks for variably controlling valve timings of intake valves separately at the respective banks. The valve timing correction control apparatus comprises air/fuel ratio sensors provided to exhaust systems of the respective banks, and a control unit that corrects the valve timings of the intake valves at the respective banks in accordance with deviations of air/fuel ratios detected by the respective air/fuel ratio sensors. A valve timing correction control method is also provided.

Abstract: Oxygen sensors (3, 13) are provided upstream and downstream of a three-way catalytic converter (10) in an exhaust passage (9) of an internal combustion engine (1). A controller (2) performs feedback correction of an air-fuel ratio of an air-fuel mixture burnt in the engine (1) by proportional/integral control based on the output of the upstream oxygen sensor (3). In this process, the controller (2) corrects a proportional part by a correction value based on the output of the downstream oxygen sensor (13) (S11, S12). The feedback correction is performed based on a feedback correction coefficient calculated using the proportional part and an integral part. The controller (2) further determines if there is a leak in the exhaust passage (9) based on the correction value (S61) (S62). Higher diagnostic precision is obtained than in the case where the determination is performed based directly on the feedback correction coefficient.

Abstract: In an intake passage (1) of an internal combustion engine (8), a compressor (4) combined with an electric motor/generator (4a) is provided. A bypass valve (6) connecting upstream and downstream portions of the intake passage (1) to bypass the compressor (4) is further provided. When a required intake air flow rate of the engine (8) is smaller than a threshold value, the engine (8) operates by natural aspiration of intake air and the electric motor/generator (4a) generate electric power by using rotational energy of the compressor (4) which rotates due to the flow of intake air. By increasing the opening of the bypass valve (6) as the required intake air flow rate diverges from the discharge flow rate of the compressor (4) the intake air flow rate is accurately controlled while satisfying the power generation requirement.

Abstract: In variable operation intake valve controlling apparatus and method for an internal combustion engine, using both of a cam operational angle variable mechanism and a cam phase variable mechanism, a controller controls an intake air quantity in accordance with valve timings of the intake valve determined according to the operational angle through the cam operational angle variable mechanism and the phase through the cam phase variable mechanism, the controller determining an allowable residual gas quantity from a required air quantity and an engine speed, the required air quantity being determined according to a manipulated variable of an accelerator, calculating optimum intake valve open and closure timings (IVO and IVC) in such a manner that both of the required air quantity and the allowable residual gas quantity enter a cylinder of the engine, and determining the operational angle and the phase from the optimum intake valve open and closure timings.

Abstract: In intake air control apparatus method for an internal combustion engine, the engine comprising variably operated valve means for making at least one of an operating angle of an intake valve and a valve lift thereof variable, a determination is made on whether a deceleration fuel supply cutoff condition to cutoff the fuel supply to the engine is established, a fuel supply cutoff control is carried out when the deceleration fuel supply cutoff condition is established, and at least one of the operating angle of intake valve and the valve lift thereof is reduced by means of the variably operated valve mechanism to a predetermined extreme minimal value before the fuel supply cutoff control is started in a state in which the deceleration fuel supply cutoff condition is established.

Abstract: In a variable intake-valve operating system for an engine enabling a working angle of an intake valve and a phase at a maximum lift point of the intake valve to be varied, a variable working-angle control mechanism is provided to continuously change the working angle of the intake valve and a variable phase control mechanism is provided to continuously change the phase of the intake valve. A control unit is configured to be electronically connected to both the two variable control mechanisms, to simultaneously control these control mechanisms responsively to a desired working angle and a desired phase both based on an engine operating condition. The control unit executes a synchronous control that a time rate of change of the working angle and a time rate of change of the phase are synchronized with each other in a transient state that the engine operating condition changes.

Abstract: A first compressor (1a) which supercharges intake air is provided in the intake passage (6, 20, 21) of an internal combustion engine (12). The first compressor (1a) is driven by the exhaust gas energy of the engine (12). A second compressor (2a) driven by an electric motor (2b), and a bypass valve (3) which bypasses the second compressor (2a), are provided in the intake passage (7, 20, 21) between the first compressor (1a) and the engine (12). The bypass valve (3) shifts from the open state to the closed state according to the operation of the second compressor (2a). At this time, the bypass valve (3) starts closing at some time after startup of the second compressor (2a) so that the intake air amount of the engine (12) is not deficient.

Abstract: In an intake passage (1) of an internal combustion engine (8), a compressor (4) combined with an electric motor/generator (4a) is provided. A bypass valve (6) connecting upstream and downstream portions of the intake passage (1) to bypass the compressor (4) is further provided. When a required intake air flow rate of the engine (8) is smaller than a threshold value, the engine (8) operates by natural aspiration of intake air and the electric motor/generator (4a) generate electric power by using rotational energy of the compressor (4) which rotates due to the flow of intake air. By increasing the opening of the bypass valve (6) as the required intake air flow rate diverges from the discharge flow rate of the compressor (4) the intake air flow rate is accurately controlled while satisfying the power generation requirement.