Abstract: In an ignition device for an internal combustion engine, the ignition device comprises: three closed circuits including first, second and third closed circuits, each circuit having at least a DC power source, a primary coil and a switching transistor; an ignition coil having three primary coils and a secondary coil; an ignition command signal generating means producing first and second ignition command signals, the first ignition command signal being applied to the third closed circuit and the second ignition command signal being applied to the control circuit; and a control circuit for causing the first and second switching elements to push-pull operate based on the input timing of the second ignition command signal.

Abstract: A device for measuring the flow rate of air includes an electric heater arranged in a path of the air flow and a temperature compensation resistor arranged at a distance from the heater in the path of the air flow, the resistance of the resistor being changed according to the temperature of the air. A selective current supply unit supplied the heater with a current having a current value selected from one of two, large and small, current values. A temperature selection unit selects a plurality of temperature values of the electric heater according to the change of the resistance of the temperature compensation resistor. A current value switching unit switches the current level of the selective current supply under the condition that one of the selected temperature values is attained or maintained.

Abstract: A displacement sensor is provided with first and second piezoelectric elements, a pair of electrodes at one and the other ends of each of the first and the second piezoelectric elements; a permanent magnet mechanically fixed to one end of the first piezoelectric element; a small piece mechanically fixed to one end of the second piezoelectric element and having almost the same weight as that of the permanent magnet; and a base plate to which the other ends of the first and the second piezoelectric elements are mechanically fixed; wherein the electrodes provided at the other end of each of the first and the second piezoelectric elements are electrically connected, and the electrodes provided at one end of each of the first and the second piezoelectric elements are used as output terminals.Also, a pair of small pieces made of a magnetic material and a non-magnetic material can be used instead of the above permanent magnet and small piece.

Abstract: The apparatus includes an ignition instruction signal generating unit for repeatedly generating a first ignition instruction signal instructing an AC discharging duration and a second ignition instruction signal instructing the current flow time of a first primary coil at each ignition timing; and an ignition control circuit unit for causing the first and second switching elements to perform a push-pull operation for a predetermined period of time upon reception of a given ignition instruction signal.

Abstract: A piezoelectric element driving device applicable to an actuator portion of a fuel injection valve for an internal combustion engine, including a first switching unit, operating to generate a first set voltage in response to a first signal transmitted at predetermined intervals, and a second switching element, operating to generate a second set voltage in response to a second signal transmitted after a predetermined period of time upon completion of the operation of the first switching element. There are provided a unit for regulating the first and second set voltages by means of rectifying devices arranged between the first and second switching elements and a piezoelectric element, and a resonance coil connected between connecting points of the first and second switching elements and the rectifying devices.

Abstract: A device for driving a load reactance element, such as a piezoelectric actuator for a fuel injection system, including a series reactance element connected in series with the load reactance element, and a resonance circuit formed by the load reactance and the series reactance. First and second switching elements are connected between the resonance circuit and the power source or ground potential. Each of the first and second switching elements is rendered conductive only during a half cycle of resonance. The directions of the load current flowing through the load reactance element are switchable by making alternately the first and second switching elements conductive.

Abstract: A gas-flow measuring apparatus including a plurality of thermocouples formed in series on a substrate. Every other thermojunction of the thermocouples is located upstream of an electric heater, while the remaining thermojunctions of the thermocouples are located downstream of the electric heater.

Abstract: A coated layer type resistor device having a first resistor element and a second resistor element. The ratio between the resistances of the first and second resistor elements is selected to be greater than a predetermined ratio. The first resistor element is formed on an insulator substrate and consists of a resistor layer and end conductor electrodes at the ends of the resistor layer, while the second resistor element is formed on the substrate and consists of a resistor layer, end conductor electrodes, and a plurality of intermediate conductors. The distance between adjacent ones of the intermediate conductors and the distance between one of the end conductor electrodes and the adjacent intermediate conductor in the second resistor element is equal to the distance between the end conductor electrodes in the first resistor element, so that the temperature coefficient property of the resistance is equal in both the first and second resistor elements.

Abstract: An ignition device for an internal combustion engine has a DC power source, first and second switching elements, a control signal generator for the switching elements, an ignition coil, and spark gaps. A first part of a primary coil of the ignition coil, a capacitor, the DC power source, and the first switching element form a closed circuit. A second part of the primary coil and the second switching element form another closed circuit. The signal generator generates ON signals for alternately turning on the first and second switching signals at predetermined timings based on an ignition command signal. The ignition performance of this ignition device for an internal combustion engine is improved.

Abstract: A signal converting apparatus for converting voltage into a pulse signal with a corresponding pulse-width comprises a switching circuit for selecting either one of an input voltage to be converted or a constant voltage depending upon a binary switching signal. The selected voltage is integrated with respect to time by an integrating circuit. When the output from the integrating circuit has reached an upper limit voltage or a lower limit voltage, the above-mentioned binary switching signal which is an output signal of this signal converting apparatus is inverted by a comparator/inverter circuit.

Abstract: In a fuel supply control apparatus for an internal-combustion engine, liquid fuel is vaporized and is supplied to a fuel gas passage leading to an intake air passage. The flow rate of the vaporized fuel flowing through the fuel gas passage is detected, and the flow rate of the fuel is calculated in accordance with the load of the engine. As a result, feedback control of the fuel to be supplied to the engine is carried out so that the detected flow rate of the vaporized fuel is close to the calculated flow rate of the fuel.

Abstract: A method for measuring the flow rate of fluid such as liquified petroleum gas fuel for an automobile fuel. A signal of the fluid flow rate and a signal of the fluid temperature are produced by using the signals from an electric heater and a first, second, and third temperature-dependent resistors in a signal processing circuit. The produced signals are supplied to a computer circuit to carry out modification, linearization, and multiplication by a conversion constant for linearization which is corrected regarding temperature characteristic. The result of calculation in the computer circuit is displayed on a display device.

Abstract: In a differential amplifier circuit, there are provided a chopper circuit for converting an input signal into an AC signal intermittently, an amplifier circuit for amplifying the output of the chopper circuit, a sample hold circuit for taking out a signal corresponding to the input signal out of the output of the amplifier circuit and an oscillator circuit for generating a pulse signal for controlling the chopper circuit and the sample hold circuit. The amplifier circuit includes an operational amplifier having an input terminal connected with a grounding resistor to which selected one of the potentials of said two input terminals is applied.

Abstract: A pair of power transistors in a push-pull connection are connected with a pair of primary coils of a transformer acting as an ignition coil. Between the neutral point of the pair of the primary coils and a power source at least one diode is connected. The paired power transistors are turned on and off with a high frequency to generate in the secondary coil of the transformer high voltage trigger pulses and substantially continuous discharge voltages which last over a long period during each ignition period.

Abstract: Two closed circuits respectively are each comprised of a primary coil of a transformer for plug ignition, a transistor, a diode, a resistor and a common power source. When one of the transistors is conductive during the ignition period, the current in the related closed circuit increases. When the increased current appearing across the associated resistor exceeds a reference value, the associated comparator renders the conducting transistor nonconductive while it renders the other nonconductive transistor conductive, whereby the transistors continues a push-pull operation at given periods. Each diode is inserted either between the associated primary coil and the associated transistor or between the associated primary coil and the common power source.