Abstract: An ignition control system is provided, which includes: an engine speed detector (101) for calculating an engine speed according to an engine crank angle signal (100); a current supply start controller (102) for outputting a proper current supply start timing signal corresponding to the engine speed to an ignition coil (5); a current supply finish controller (103) for outputting a proper current supply timing signal corresponding to the engine speed to an ignition coil; an ignition coil controller (104) for controlling supply of power to the ignition coil (5) according to the current supply start timing signal and the current supply finish timing signal; and an overspeed determination device (105) for outputting an overspeed determination signal when determining that the engine speed is in excess of a predetermined limit value. The overspeed determination signal prohibits starting the supply of current, and retards the current supply finish timing to such a degree as to decrease engine torque.

Abstract: The invention provides a magnetic object motion sensor which can operate with high accuracy not only when a magnetic object moves at high speeds but also even when it moves at low speeds, which can be produced with a greater production tolerance and a greater dimensional tolerance.

Abstract: A magnetic detector to detect a magnetic object's rotation and movement using a magnetoresistive element having hysteresis. The magnetoresistive element is set so as to tilt from the magnetizing direction of a magnet up to a predetermined angle &thgr; between the rotational magnetic object to be detected and the magnet. The magnetic detector provides a high accuracy signal that corresponds to the distance between the rotational magnetic object to be detected and the magnetoresistive element. The signal obtained is independent of the rotational direction or rotational speed of the magnetic object to be detected or the atmospheric temperature of an apparatus. Moreover, the temperature dependency of the output signal (amplitude) of the magnetoresistive element is decreased.

Abstract: A magnetic object motion sensor which can operate with high accuracy not only when a magnetic object moves at high speeds but also even when it moves at low speeds, which can be produced with a greater production tolerance and a greater dimensional tolerance.

Abstract: A combustion state detecting apparatus for an internal-combustion engine improves the signal-to-noise ratio of an ionic pulse signal to achieve good interfacing characteristic, high detection accuracy, and high control reliability without adding to cost. An electronic control unit (2A) which detects the combustion state in a spark plug according to an ionic pulse signal (Gi) includes: an edge detecting circuit (36) for detecting an end edge of an ionic pulse contained in the ionic pulse signal in a detection zone from a second reference crank angle to a first reference crank angle; a level detecting circuit (37) for detecting the level of the ionic pulse signal at the first reference crank angle; and a circuit (38) for determining the combustion state of the internal-combustion engine according to a detection result (Ni) received from the edge detecting circuit and a detection result (Li) received from the level detecting circuit.

Abstract: An exhaust gas recirculation control system for internal combustion engines, comprising an exhaust gas recirculation passage for recirculating a part of an exhaust gas from an internal combustion engine into the engine; an exhaust gas recirculation control valve for controlling a flow rate of the exhaust gas flowing in the exhaust gas recirculation passage; an opening degree controller for controlling an opening degree of the exhaust gas recirculation control valve; an operating condition detector for detecting an operating condition of the engine; means for setting a target exhaust gas recirculation ratio depending on the detected operating condition; a combustion state detector for detecting a combustion state in at least one cylinder of the engine; means for finding an actual exhaust gas recirculation ratio of the engine based on the detected combustion state; and means for controlling the opening degree controller so as to bring the actual exhaust gas recirculation ratio to the target exhaust gas recircul

Abstract: A control apparatus for an internal combustion engine comprises: driving state detecting means for detecting a driving state of the internal combustion engine based on detected information from various sensors; control calculating means for calculating a control parameter of the internal combustion engine in accordance with the driving state; combustion state detecting means for detecting a combustion state amount of at least one of cylinders of the internal combustion engine; fuel property calculating means for calculating a property of a fuel supplied to the internal combustion engine based on the driving state and the combustion state amount; and parameter correcting means for correcting the control parameter in accordance with the fuel property.

Abstract: A method for manufacturing an inexpensive rotation sensor having excellent performance, high workability, and high reliability is provided. In the method, the rotation sensor is manufactured by providing an insert conductor having a predetermined shape and insert-molding the insert conductor in a resin base such that at least a connector terminal and an conversion device terminal of the insert conductor remains exposed from the resin base. Also, a resin connector part is molded after the resin base is molded such that the resin connector part encircles the connector terminal.

Abstract: A combustion state detecting apparatus for an internal combustion engine is capable of ensuring a satisfactory ion current detection sensitivity and reliability by preventing discharge of bias voltage to an ignition coil to thereby protect the bias voltage against lowering.

Abstract: A combustion state detecting apparatus for an internal-combustion engine does not incur deteriorated ignition characteristics because the ionic current detecting circuit thereof is not affected by ignition current. The combustion state detecting apparatus is equipped with an ionic current detecting circuit (10A) which includes a biasing device (C) connected to the low voltage end of a secondary winding (2b) of an ignition coil (2) and which detects ionic current (i) flowing from the biasing device via a spark plug (4); rectifying device (5) which is inserted between the biasing device and the secondary winding so that the ionic current flows in the forward direction; a voltage clamping device (6) inserted between the secondary winding and the ground; and an ECU (20) which detects the combustion state according to the ionic current.

Abstract: A magnetic sensor whose electronic components will never become fatally damaged as the result of an external force. In this magnetic sensor, electronic components located near a connector are connected to a base and disposed in such a manner that the longitudinal axis of those electronic components are substantially perpendicular to the longitudinal axis of the base. A crack generating region is formed between the connector electronic component disposed near the connector. The crack generating region yields application of an external force on the base.

Abstract: A sensing device capable of outputting a correct signal precisely corresponding to a particular position (angle) of, for example a protruding or recessed portion of a rotating member made of a magnetic material as soon as the electric power of the sensing device is turned on.

Abstract: The invention provides a high-accuracy and high-reliability magnetic sensor which can be produced with a high production yield at a low cost.

Abstract: An combustion state detecting apparatus for an internal-combustion engine is provided for preventing control errors and detection errors by preventing a biasing circuit from discharging at the start of energization, thereby allowing good sensitivity for detecting ionic current to be maintained. The combustion state detecting apparatus comprises an ionic current detecting circuit which includes a biasing circuit connected to the low voltage end of a secondary winding of an ignition coil and which detects ionic current flowing from the biasing circuit via a spark plug after the combustion of a fuel-air mixture. A current limiting circuit is provided between the low voltage end of the secondary winding and the biasing circuit. An electronic control unit detects the combustion state at the spark plug according to the ionic current.

Abstract: The invention provides a sensing device capable of outputting a correct signal precisely corresponding to a particular position (angle) such as a protruding or recessed portion of a rotating member made of a magnetic material over the entire operating temperature range regardless of the temperature coefficient of the magnetic field sensing element. The sensing device includes: a magnet for generating a magnetic field; a rotary member of magnetic material for changing the magnetic field generated by the magnet, the rotary member being disposed at a predetermined distance apart from the magnet; a giant magnetoresistance device which changes in resistance in response to the magnetic field whose magnitude is changed by the rotary member of magnetic material; and an AC coupling circuit for performing an AC coupling process on the output of signal of the giant magnetoresistance device.

Abstract: An ignition controller for an internal combustion engine includes a control/calculation circuit for creating drive signals to injectors and ignition coils based on the rotation angle SGT and the operating state of the internal combustion engine. The control/calculation circuit includes means for calculating the respective timings at which the injectors and the ignition coils are controlled according to an operating state, means for discriminating a predetermined operating state corresponding to a state where fuel adheres to the ignition plugs and means for switching the timings at which the ignition plugs are driven according to a signal which discriminates the predetermined operating state.

Abstract: An combustion state detecting apparatus for an internal-combustion engine is equipped with: an ignition coil (4) for applying a high voltage (V2) for igniting to the spark plugs (8a through 8d) of the cylinders of an internal-combustion engine; an ionic current detecting circuit for applying a bias voltage (VBi) to at least one spark plug to detect ionic currents (ia, ib) flowing via the spark plug which has just been subjected to ignition control; comparator circuits (14a, 14b) which compare detected ionic current signals (Eia, Eib) with threshold values (TH1, TH2) and turn them into ionic current pulses (Gia, Gib); and an ECU (2A) which drives the ignition coil according to a crank angle signal (SGT) and determines the combustion state of the internal-combustion engine. The ECU changes the threshold values for each ignition control and judges the combustion state according to the respective threshold values and the state in which the ionic current pulses are generated.

Abstract: A rotation sensor is provided which is inexpensive and has excellent performance, high workability, and high reliability. Specifically, the rotation sensor contains a magnetoelectric conversion device, a base, an insert conductor, a surface mount electrode part, an electronic component, and a connector part. The magnetoelectric conversion device senses a magnetic flux change associated with a rotation of a magnetic rotation body, and the base is made of resin and holds the magnetoelectric conversion device. The insert conductor is insert-molded in the base, and an exposed part of the insert conductor is exposed to a surface of the base. The surface mount electrode part is formed by at least the exposed part of the insert conductor and is connected to the magnetoelectric conversion device. The electronic component is mounted on the surface mount electrode part, and the connector part is formed by using an end of the insert conductor as a terminal electrode.

Abstract: The invention provides a sensing device capable of outputting a correct signal precisely corresponding to a particular position (angle) of, for example a protruding or recessed portion of a rotating member made of a magnetic material.

Abstract: In an internal combustion engine controller, a crank angle signal SGTP includes pulses corresponding to first and second reference crank angles and a cylinder identification signal SGCP includes a pulse having a phase difference to the crank angle signal, the pulse number of a specific cylinder from the second reference crank angle to the first reference crank angle is different from those of other cylinders, a control/arithmetic operation circuit includes means for calculating control timings, means for counting the pulse number of the cylinder identification signal, means for outputting a cylinder identification flag FC by assessing a cylinder identifying state based on a count value CP and a previous count value CPO and means for reflecting the cylinder identification flag to the output state of drive signals and control reflection means prohibits the output of the drive signals when the cylinder identification flag is abnormal.