Abstract: A device is provided with which it is made possible to rapidly determine that an internal combustion engine is in a stop state and to prevent an erroneous determination of starting. In a stop determination device provided with a detection unit that detects the rotation direction of the crankshaft of an internal combustion engine, it is determined that the internal combustion engine is in a stop state, in the case where a signal from the detection unit is not inputted for a predetermined time or in the case where a rotation-direction signal from the detection unit continuously reverses thrice or more times. Additionally, in the case where, from the detection unit, a signal of the same rotation direction is continuously inputted twice or more times, a determination that an internal combustion engine is in a stop state is cancelled.

Abstract: A control device of an internal combustion engine includes a target air-fuel ratio set portion that sets a target air-fuel ratio according to an operating state of the internal combustion engine, an air-fuel ratio detection portion that detects an actual air-fuel ratio, a feedback correction value calculation portion that calculates a feedback correction value to correct a fuel injection amount for the actual air-fuel ratio to coincide with the target air-fuel ratio, and a fuel property change determination portion that determines a change of a fuel property on the basis of a change of a correction amount including a correction value for the fuel injection amount calculated on the basis of the feedback correction value in addition to the feedback correction value. The control device can determine a change of the fuel property accurately even when a change of the feedback correction value is reflected on another correction value.

Abstract: The device including: a fuel correction value calculating unit for calculating a correction value for a fuel injection quantity so that an actual air-fuel ratio becomes equal to a target air-fuel ratio; a fuel switching detecting unit for detecting that fuel switching has occurred; a fuel property estimating unit for setting a period, in which there is a possibility that a fuel property changes, as a property change period when the fuel switching is detected to calculate a fuel property correction value corresponding to another correction value for the fuel injection quantity based on the correction value within the property change period; and a property change judging unit for judging whether or not a change in the correction value is due to the change in the fuel property in a case where the correction value becomes out of a predetermined range even though the property change period is not set.

Abstract: The fuel supply system of an internal combustion engine includes an electronic control unit (ECU) for transferring the engine from a state in which a high-pressure fuel pump does not deliver any pressurized fuel to a state in which the high-pressure fuel pump begins to deliver the pressurized fuel by gradually varying an output period of a drive signal for controlling opening/closing behavior of a solenoid valve while monitoring changes in fuel pressure detected by a pressure sensor, and for estimating a mounting error between angular mounting positions of the high-pressure fuel pump and a pump actuating cam with reference to a rotation signal from a state of the solenoid valve drive signal when a change in the fuel pressure has been detected. The solenoid valve drive signal is corrected based on the value of the mounting error estimated by the ECU.

Abstract: A device is provided with which it is made possible to rapidly determine that an internal combustion engine is in a stop state and to prevent an erroneous determination of starting. In a stop determination device provided with a detection unit that detects the rotation direction of the crankshaft of an internal combustion engine, it is determined that the internal combustion engine is in a stop state, in the case where a signal from the detection unit is not inputted for a predetermined time or in the case where a rotation-direction signal from the detection unit continuously reverses thrice or more times. Additionally, in the case where, from the detection unit, a signal of the same rotation direction is continuously inputted twice or more times, a determination that an internal combustion engine is in a stop state is cancelled.

Abstract: A magnetic detection device is provided in which a first signal is outputted in accordance with the mutual phase relationship between the output of a first magnetoelectric conversion output circuit and the output of a second magnetoelectric conversion output circuit that are based on the movement, in forward direction, of a detection subject, thereby generating a pulse of a high level 1 and a low level 1; a second signal is outputted in accordance with the mutual phase relationship between the output of the first magnetoelectric conversion output circuit and the output of the second magnetoelectric conversion output circuit that are based on the movement, in forward direction, of the detection subject; an output signal processing circuit for generating a pulse of a high level 2 and a low level 2 is provided; and not only the pulse of the high level 1 and the low level 1 does not cross the other comparison level, but also the pulse of the high level 2 and the low level 2 does not cross the one comparison level

Abstract: A magnetic detection device is provided in which a first signal is outputted in accordance with the mutual phase relationship between the output of a first magnetoelectric conversion output circuit and the output of a second magnetoelectric conversion output circuit that are based on the movement, in forward direction, of a detection subject, thereby generating a pulse of a high level 1 and a low level 1; a second signal is outputted in accordance with the mutual phase relationship between the output of the first magnetoelectric conversion output circuit and the output of the second magnetoelectric conversion output circuit that are based on the movement, in forward direction, of the detection subject; an output signal processing circuit for generating a pulse of a high level 2 and a low level 2 is provided; and not only the pulse of the high level 1 and the low level 1 does not cross the other comparison level, but also the pulse of the high level 2 and the low level 2 does not cross the one comparison level

Abstract: A control apparatus for an internal combustion engine, comprising crank angle calculation means for calculating a crank angle between edges which are detected by a first crank angle sensor and a second crank angle sensor, on the basis of a crank cycle between the edges, and engine-rotation-direction detection inhibit means for inhibiting detection of an engine rotation direction on the basis of the calculated crank angle, wherein the engine-rotation-direction detection inhibit means inhibits the detection of the engine rotation direction in a case where the crank angle calculated by the crank angle calculation means has satisfied a predetermined inhibit decision condition.

Abstract: A control apparatus for an internal combustion engine, comprising crank angle calculation means for calculating a crank angle between edges which are detected by a first crank angle sensor and a second crank angle sensor, on the basis of a crank cycle between the edges, and engine-rotation-direction detection inhibit means for inhibiting detection of an engine rotation direction on the basis of the calculated crank angle, wherein the engine-rotation-direction detection inhibit means inhibits the detection of the engine rotation direction in a case where the crank angle calculated by the crank angle calculation means has satisfied a predetermined inhibit decision condition.

Abstract: The fuel supply system of an internal combustion engine includes an electronic control unit (ECU) for transferring the engine from a state in which a high-pressure fuel pump does not deliver any pressurized fuel to a state in which the high-pressure fuel pump begins to deliver the pressurized fuel by gradually varying an output period of a drive signal for controlling opening/closing behavior of a solenoid valve while monitoring changes in fuel pressure detected by a pressure sensor, and for estimating a mounting error between angular mounting positions of the high-pressure fuel pump and a pump actuating cam with reference to a rotation signal from a state of the solenoid valve drive signal when a change in the fuel pressure has been detected. The solenoid valve drive signal is corrected based on the value of the mounting error estimated by the ECU.

Abstract: A fuel supply apparatus for an internal combustion engine includes a rotation position detection unit for outputting a rotation position signal of the internal combustion engine, a control unit for controlling a electromagnetic valve by the rotation position signal so that the discharge amount corresponds to an operation state, and an error estimation means for estimating the attachment error of a high pressure fuel pump and a pump driving cam on the basis of a fuel pressure change position where the fuel pressure in a delivery pipe is changed by a discharge start of the high pressure fuel pump and a rotation position of the internal combustion engine, in which the control unit controls the control signal to the electromagnetic valve according to the attachment error estimated by the error estimation means.

Abstract: A fuel supply apparatus for an internal combustion engine includes a rotation position detection unit for outputting a rotation position signal of the internal combustion engine, a control unit for controlling a electromagnetic valve by the rotation position signal so that the discharge amount corresponds to an operation state, and an error estimation means for estimating the attachment error of a high pressure fuel pump and a pump driving cam on the basis of a fuel pressure change position where the fuel pressure in a delivery pipe is changed by a discharge start of the high pressure fuel pump and a rotation position of the internal combustion engine, in which the control unit controls the control signal to the electromagnetic valve according to the attachment error estimated by the error estimation means.

Abstract: A starting device for an internal combustion engine is capable of increasing starting torque as well as supplying air to a cylinder that is on the expansion stroke without separately providing a means for supplying high-pressure air. Communication control valves control the states of communication between cylinders of the engine. A crank angle detector detects the crank angle of a crankshaft of the engine. A compression/expansion identification part identifies the compression stroke or the expansion stroke of each cylinder. Fuel is injected into a cylinder on the expansion stroke and ignited therein, and the expansion stroke cylinder is placed in communication with a cylinder on the exhaust stroke by a communication state control part for a prescribed time after the ignition thereof, after which the expansion stroke cylinder is further placed in communication with a cylinder on the compression stroke for a prescribed time.

Abstract: A starting device for an internal combustion engine is capable of increasing starting torque as well as supplying air to a cylinder that is on the expansion stroke without separately providing a means for supplying high-pressure air. Communication control valves control the states of communication between cylinders of the engine. A crank angle detector detects the crank angle of a crankshaft of the engine. A compression/expansion identification part identifies the compression stroke or the expansion stroke of each cylinder. Fuel is injected into a cylinder on the expansion stroke and ignited therein, and the expansion stroke cylinder is placed in communication with a cylinder on the exhaust stroke by a communication state control part for a prescribed time after the ignition thereof, after which the expansion stroke cylinder is further placed in communication with a cylinder on the compression stroke for a prescribed time.

Abstract: A starting device for an internal combustion engine is capable of increasing starting torque as well as supplying air to a cylinder that is on the expansion stroke without separately providing a means for supplying high-pressure air. Communication control valves control the states of communication between cylinders of the engine. A crank angle detector detects the crank angle of a crankshaft of the engine. A compression/expansion identification part identifies the compression stroke or the expansion stroke of each cylinder. Fuel is injected into a cylinder on the expansion stroke and ignited therein, and the expansion stroke cylinder is placed in communication with a cylinder on the exhaust stroke by a communication state control part for a prescribed time after the ignition thereof, after which the expansion stroke cylinder is further placed in communication with a cylinder on the compression stroke for a prescribed time.

Abstract: The present invention has: a crank signal vane in which teeth are provided on a circumference at predetermined crank angles, and a first missing tooth portion having one missing tooth and a second missing tooth portion having two missing teeth are established; a crank angle sensor for outputting a pulse shape crank signal pattern corresponding to the teeth; and an electronic control unit for calculating a crank signal period based on the crank signal pattern, computing a missing tooth identification value based on the calculated crank signal period; detecting the number of missing teeth based on the computed missing tooth identification value, detecting a crank angle reference position for cases in which the detected number of missing teeth is one or two, and identifying a cylinder group.

Abstract: A starting device for an internal combustion engine is capable of increasing starting torque as well as supplying air to a cylinder that is on the expansion stroke without separately providing a means for supplying high-pressure air. Communication control valves control the states of communication between cylinders of the engine. A crank angle detector detects the crank angle of a crankshaft of the engine. A compression/expansion identification part identifies the compression stroke or the expansion stroke of each cylinder. Fuel is injected into a cylinder on the expansion stroke and ignited therein, and the expansion stroke cylinder is placed in communication with a cylinder on the exhaust stroke by a communication state control part for a prescribed time after the ignition thereof, after which the expansion stroke cylinder is further placed in communication with a cylinder on the compression stroke for a prescribed time.

Abstract: A cylinder identifying apparatus has a generator which generates a cylinder discrimination signal, a generator which generates a crank angle position signal, and a control unit which obtains the number of detections of the crank angle position signal, the number of detections of the cylinder discrimination signal, the number of detections of the crank angle position signal at the time of detection of the cylinder discrimination signal, etc. The control unit sets a cylinder discrimination period B35° to B75° CA if the present reference crank position is a first-time detection result after startup, sets a cylinder discrimination period B75° to B75° CA if the present reference crank position is a second-time or some other subsequent detection result, obtains the number of detections of the cylinder discrimination signal, and identifies a cylinder on the basis of the number of pulse dropouts and the number of detections of the cylinder discrimination signal.

Abstract: An actuator for changing a relative position of at least an intake or exhaust camshaft, and a crank shaft; a cylinder identifying unit for performing cylinder identification in accordance with results detected by a crank angle sensor and a cam angle sensor; a valve timing detecting unit for detecting valve timing in accordance with the results detected by the crank angle sensor and the cam angle sensor; and an OCV for controlling the actuator based on a value detected by the valve timing detecting unit are provided. Control is performed at a neutral point by a valve timing controlling unit when the cylinder identification by the cylinder identifying unit is in an indefinite state.

Abstract: The present invention has: a crank signal vane in which teeth are provided on a circumference at predetermined crank angles, and a first missing tooth portion having one missing tooth and a second missing tooth portion having two missing teeth are established; a crank angle sensor for outputting a pulse shape crank signal pattern corresponding to the teeth; and an electronic control unit for calculating a crank signal period based on the crank signal pattern, computing a missing tooth identification value based on the calculated crank signal period; detecting the number of missing teeth based on the computed missing tooth identification value, detecting a crank angle reference position for cases in which the detected number of missing teeth is one or two, and identifying a cylinder group.