Abstract: A control system for an internal combustion engine is provided which is capable of controlling ignition timing, fuel injection timing and a fuel injection amount in a stable manner at any time even in an engine, or in an operating range or in an operating condition thereof, in which there are great variations in the number of revolutions per minute of the engine.

Abstract: A power supply system for a control unit of an internal combustion engine is provided which is capable of holding an engine controllable state after starting of the engine until the engine is stopped at a driver's will. A relay 8 with a self holding function is inserted in a power supply line 21a exclusively used for supplying electric power from a battery 6 to the internal combustion engine control unit and its related devices.

Abstract: A control unit for an internal combustion engine is provided in which the number of input and output terminals can be reduced while maintaining the function of detecting an abnormality of an existing internal combustion engine and generating a warning based thereon, as a consequence of which the size and weight of the control unit is reduced.

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: 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: 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 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: 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: The invention provides a sensing device capable of outputting a high-accuracy signal precisely corresponding to a particular position (angle) of a rotating member made of a magnetic material without being disturbed by external noise. The sensing device includes: a magnet for generating a magnetic field; a rotating member made of a magnetic material, for changing the magnetic field generated by the magnet, the rotating member being disposed a predetermined distance apart from the magnet; and a giant magnetoresistance device whose resistance changes in response to the change in the magnetic field caused by the rotating member of magnetic material, wherein the size L.sub.3 of the magnetic field sensing plane of the giant magnetoresistance device is set to a value less than the smallest value of the dimensions L.sub.1 and L.sub.2 of the protruding and recessed portions of the rotating member of magnetic material, that is, the size L.sub.

Abstract: An electronic circuit equipment including a substantially box-shaped case body 30 for defining a sealed interior space therein and an electronic circuit board 11 having a plurality of electronic components 12 mounted thereon. The case body comprises a pair of cup-shaped sections 30a clamped together at their opposite ends, and sandwiching between them the circuit board, surrounded and sealingly enclosed by a gas-impermeable flexible sheet 32. A vent hole 20 is provided in one of the sections 30a such that the sheet 32 flexes to absorb pressure fluctuations, and prevents the circuit board from bending.

Abstract: A ignition coil device for an internal combustion engine includes: a tubular high tension terminal which is electrically connected to a secondary output terminal of an ignition coil and has a side face portion, and one end of which is open; a first member accommodated in the tubular portion of the high tension terminal and fixed in the side face portion; a coil-shaped electrically conductive spring member which is accommodated in the tubular portion of the high tension terminal, and one end portion of which is wound around the first member a plurality of times in contact therewith; a second member accommodated in the tubular portion of the high tension terminal and having a shaft portion around which another end portion of the electrically conductive spring member is wound a plurality of times in contact therewith and a contacting portion which is electrically connected to a conductor of an ignition cable in contact therewith; and a retaining portion for retaining the conductor in a state in which the conduct

Abstract: An electronic circuit equipment including a substantially box-shaped case main body (10) for defining a sealed interior space therein and an electronic circuit board (11) having a plurality of electronic components (12) thereon. The case main body (10) comprises a case body (13) and a flat plate-shaped lid (17) positioned properly with respect to the case body (13) to seal the interior space. A vent hole (20) is formed in the bottom wall of the case body (13) for communicating the interior of the case body (13) with ambient atmosphere. A cover member is attached to the case body (13) to cover the vent hole hermetically. By using a cover member, the interior space of the case body (13) is sealed for protecting electronic components (12) on the electronic circuit board (11) from moisture and rainwater and, for absorbing a pressure fluctuation therein. A mounting flange extends from the case body and surrounds the vent hole. The cover member is a flexible diaphragm with a circumferential bulge.

Abstract: A control device for an internal combustion engine comprises a shift lever position detector for detecting a shift lever position of an engine for an outboard motor; and an ignition timing controller for retarding an ignition timing of the engine for the outboard motor based on the shift lever position when a clutch is disengaged.

Abstract: An engine control apparatus and method can prevent engine stall in a reliable manner when the engine is changed from a high-speed loaded operation into an idling operation. An air/fuel mixture is supplied to engine cylinders 16 through an intake passage 1 with a throttle valve 6 disposed therein, and a bypass passage 10 with an air valve 12 disposed therein is connected with the intake passage 1 for bypassing the throttle valve 6 to supply auxiliary air to the cylinders. Based on an operating condition signal D in the form of an idle switch on/off signal, an electronic control unit (ECU) 30A detects a change from a loaded operation into an idling operation of the engine, and determines, based on a speed signal R from a speed sensor, whether the number of revolutions per minute of the engine R is equal to or less than a predetermined reference value Rk.

Abstract: An engine control apparatus for a multi-cylinder engine is provided which precisely controls a plurality of groups of cylinders on the basis of a plurality of reference position sensors, each of which senses a reference crank position of a corresponding group of cylinders. The apparatus generates control signals for controlling the plurality of groups of cylinders even in the event of a failure of any one of the sensors thus providing a fail-safe operation. The sensors generate output signals, in synchronization with the crankshaft, which are feed to an OR gate which generates a single output signal each time a signal is received from the sensors. The output signal from the OR gate is feed to an interrupt terminal of a microcomputer whereupon the latter starts an interrupt processing which identifies the group of cylinders corresponding to the output signal and generates control signals.

Abstract: An ignition timing control device for an internal combustion engine includes an ignition signal coil for producing a first pulse signal in synchronism with the revolution of the engine and in correspondence to a predetermined crank angle position, a crank angle sensor for producing a second pulse signal in synchronism with the revolution of the crank, the second pulse signal having a greater frequency than said first pulse signal, and a microcomputer for performing an ignition control of the engine by detecting the crank angle on the basis of the first and second pulse signals. The microcomputer is adapted to perform an ignition control by another means when an abnormal state of the crank angle sensor is detected from the second pulse signal.

Abstract: An engine control apparatus and method can prevent hunting during engine deceleration in a reliable manner, thereby improving the driving sensation or comfort of the driver of a vehicle. An air/fuel mixture is supplied to engine cylinders through an intake passage with a throttle valve disposed therein, and a bypass passage with an air valve disposed therein is connected with the intake passage for bypassing the throttle valve to supply auxiliary air to the cylinders.

Abstract: Disclosed herein is a malfunction detection apparatus for use in an outboard engine or motor system having a tachometer. The apparatus includes a tachometer output circuit for applying the tachometer signal to the tachometer in accordance with the input signal attributing to the battery voltage or engine speed, the battery abnormality detecting circuit for detecting the abnormal condition of the battery voltage, to provide the detection signal and the switch circuit for suspending, in response to the detection signal, the application of the tachometer signal from the tachometer output circuit to the tachometer. The apparatus is advantageous in that the erroneous operation of the tachometer can be positively prevented.

Abstract: Disclosed herein is a trouble diagnosis device for use in a motor vehicle includes a plurality of input units for inputting signals corresponding to various conditions, a plurality of display units provided respectively for the plurality of input units, for displaying the various conditions and an engine control unit which, when plural input units, which are normally not selected in combination, are actuated, enters a trouble diagnosis mode, and turns on the plurality of display units as a trouble diagnosis display. The device can perform the inputting and displaying of the trouble diagnosis mode with ordinary units and without particular units.

Abstract: Disclosed herein is a device for detecting an occurrence of abnormal condition accurately in a load such as a plurality of fuel injectors for use in an internal combustion engine or the like with a single abnormality determining circuit.