Abstract: A temperature projecting system includes a temperature sensor for monitoring a temperature of an objective portion where the temperature changes depending on an engine operating condition. The temperature projecting system projects an actual temperature of the objective portion based on the monitored temperature but free of a first-order lag of the temperature sensor. A temperature control system includes the temperature projecting system. The temperature control system derives a correction amount for a basic control amount of an actuator based on a difference between the projected actual temperature and a target temperature. The basic control amount is corrected by the correction amount to derive a corrected control amount which controls the engine operating condition and thus the temperature of the objective portion.

Abstract: The present invention-provides a method for preparing a high-purity aqueous quaternary ammonium hydroxide solution, and there is here disclosed this method for preparing the high-purity aqueous quaternary ammonium hydroxide solution which comprises reacting a quaternary ammonium organic acid salt with hydrogen peroxide, oxygen or an oxygen-containing gas in the presence of a platinum group metal catalyst to produce a quaternary ammonium inorganic acid salt, and then electrolyzing this inorganic acid salt by the use of an electrolytic tank having a cation exchange membrane.

Abstract: A fuel vapor purging control system for an internal combustion engine is provided. This purging control system incorporates an air/fuel ratio compensating system which includes a purge control valve for controlling a purge flow rate of an air-fuel vapor mixture flowing into an induction system of the engine through a purge passage according to a preselected engine operating condition parameter, a sensor disposed in the purge passage for determining an amount of fuel in the air-fuel vapor mixture, an air/fuel ratio controller for modifying an amount of fuel in an air/fuel mixture injected through a fuel injection system of the engine based on the amount of fuel in the air-fuel vapor mixture determined by the sensor for assuring a desired air/fuel ratio of the air/fuel mixture entering a combustion chamber of the engine.

Abstract: A spark timing control system includes an engine state detecting device for detecting a state of an internal combustion engine. A vehicle vibration detecting device serves to detect a vibration of a vehicle in a longitudinal direction with respect to the vehicle. A target vehicle vibration value calculating device serves to calculate a target vehicle vibration value on the basis of one of results of detections by the engine state detecting device and the vehicle vibration detecting device. A control quantity setting device serves to set a control quantity of a spark timing so as to control the result of detection by the vehicle vibration detecting device at the target vehicle vibration value by use of an optimal feedback gain which is determined according to a dynamic model of the engine.

Abstract: This invention provides a delay circuit capable of electrically varying the delay amount comprising a first transistor for receiving a signal to be delayed from the base connected to an input terminal and outputting a positive phase signal and a negative phase signal with respect to the signal from the input terminal, respectively from the emitter and the collector thereof; two variable capacity diodes with their terminals of the same polarity connected together and a specified control voltage applied to the point of said connection, one end of the connected diodes being connected to the emitter of said first transistor; a second transistor with the base grounded, the emitter connected to the collector of the above-mentioned first transistor, and the collector connected to one end of a specified resistance; and a delayed signal output terminal having connected thereto the other end of the two variable capacity diodes and the other end of the specified resistance.

Abstract: The digital control unit of the present invention relates to improvements in what is called recent control, and more particularly relates to the idle rotating speed control unit of an internal combustion engine in which the idle rotating speed can be quickly converged to the target rotating speed in the case where a load given from the outside varies. Especially, when the value of the state variable is reversely calculated from the state in which open loop control is conducted, the initial value can be accurately determined.

Abstract: There is disclosed a self-diagnosis apparatus in which when detecting a supply abnormally (i.e., failure to lead fuel evaporation gas into an intake passage), the abnormality can be accurately detected, taking into consideration variations in the fuel gas density (variations in the ambient temperature, variations in the volatility of the fuel, and etc.) due to the residual air in a fuel tank. In the apparatus, the amount of flow of the gas from the fuel tank to a canister can be detected, and a control circuit controls a purge valve to close a fuel gas discharge passage, and in this condition the control circuit detects the amount of flow of the gas from the fuel tank to the canister. When this flow amount exceeds a set value, the control circuit controls the purge valve to close and open the discharge passage, and judges in accordance with a change in an air-fuel ratio detected at this time by an O.sub.2 sensor whether or not any abnormality exists.

Abstract: An air-fuel ratio feedback control apparatus for a gas engine. A mixer mixes intake air and a fuel gas. A subsidiary supply path supplies at least one of the intake air and the fuel gas downstream of the mixer. Oxygen concentration sensors detect a concentration of oxygen in an exhaust gas; and operation condition detectors detect operating conditions of the gas engine. A basic amount setting unit sets a basic amount of at least one of the intake air and the fuel gas supplied through the subsidiary supply path. A correction amount setting unit sets a correction amount proportional to a total fuel gas supply rate, and a control amount setting unit for setting a control amount of at least one of the intake air and the fuel gas supplied through the subsidiary supply path by adding the basic amount and the correction amount together, whereby the air-fuel ratio of the gas engine can be controlled at a desired value even when a bypass supply ratio of the fuel gas varies.

Abstract: An air-fuel ratio control apparatus for an internal combustion engine which is equipped with an air-fuel ratio sensor for sensing an actual air-fuel ratio of a mixture to be introduced into the engine and a target air-fuel ratio setting section for setting a target air-fuel ratio of the engine. Also included is a controlled-amount calculating section for setting an optimal feedback gain on the basis of a predetermined dynamic model of the engine to calculate a controlled amount in accordance with the predetermined optimal feedback gain so that the actual air-fuel ratio becomes equal to the target air-fuel ratio. A fuel supply amount to the engine is determined on the basis of the calculated controlled amount, and the control responsiveness of the controlled-amount calculating section is suppressed when the engine is in a speed-decreasing state. This arrangement can adequately control the air-fuel ratio of the engine irrespective of the engine speed-decreasing state.

Abstract: An improved process for preparing a printed-circuit board, which successively comprises (I) a step of forming a positive photo-sensitive resist film onto a circuit board having a conductive film according to the electrodeposition coating process, (II) a step of irradiating a full dose of an actinic ray onto the positive photo-sensitive resist film through a photomask with which the actinic ray is cut off over a conductive circuit-forming area, (III) a step of developing the resulting resist film, (IV) a step of etching away a deposited copper-clad area, and (V) removing a remaining resist film on the conductive circuit-forming area, the improvement further comprising a step of imparting the resist film in the conductive circuit-forming area an increased alkali resistance prior to development so as to obtain the printed-circuit board having high resolution with good reproductivity without being affected by variations of the developing conditions.

Abstract: A surface treating agent for an aluminum line pattern substrate is disclosed, comprising an aqueous solution containing 0.01 to 15% by weight of quaternary ammonium hydroxide represented by the general formula: ##STR1## wherein R is an alkyl group having 1 to 3 carbon atoms, or a hydroxy-substituted alkyl group having 1 to 3 carbon atoms, and R.sup.1, R.sup.2 and R.sup.3 are independently an alkyl group having 1 to 3 carbon atoms, and 0.1 to 20% by weight of sugar or sugar alcohol. This agent can inhibit the after-corrosion of aluminum effectively.

Abstract: An air-fuel ratio control apparatus in which an air-fuel ratio of a mixture gas supplied to an engine, especially, a gas engine, is controlled in accordance with an output signal of each of oxygen concentration sensors disposed in upper and lower streams of an exhaust gas catalyzer of the engine. The output signal of the oxygen concentration sensor disposed on the upper stream side of the catalyzer is provided as one input signal of an air-fuel ratio control unit and the output signal of the oxygen concentration sensor disposed on the lower stream side of the catalyzer is provided as an input signal of an output signal correction amount determination unit, respectively. A mixing member for mixing an exhaust gas is disposed in an upper stream of each oxygen concentration sensor to detect the concentration of oxygen in the exhaust gas which is well mixed.

Abstract: A process of producing electrical terminals with electrical contacts, including the steps of: a first step for continuously providing contact mounting holes at a first predetermined distance in an electrical conductive base and conveying the electrical conductive base in a first direction; a second step for continuously providing contact holding holes at a second predetermined distance in a carrier, continuously fitting electrical contacts into the contact holding holes and conveying the carrier in a second direction perpendicular to the first direction; a third step for positioning the electrical contacts in the contact holding holes of the carrier to the contact mounting holes of the electrical conductive base; a fourth step for fitting the electrical contacts in the contact holding holes into the contact mounting holes of the electrical conductive base; and a fifth step for cutting the electrical conductive base to separate electrical terminal each having an electrical contact at an end thereof.

Abstract: A delay circuit of ultrasonic diagnostic apparatus comprising a delay line consisting of a plurality of unit portions connected in cascade, in each of which an anode of a first variable capacitance diode and a cathode of a second variable capacitance diode are connected with a connecting point of two inductors connected in series, or a delay line obtained by replacing capacitances in a second order all pass type delay line by variable capacitance diodes, or a delay line, in which variable capacitance diodes and inductors form a balanced circuit; and control circuit for applying a reverse bias voltage to each of the variable capacitance diodes; and an amplifier or a variable resistance circuit using FETs serving as a matching circuit for the delay line, capable of varying continuously an input impedance by using a control voltage from the exterior.

Abstract: A disc brake assembly includes a mounting member and two brake pads mounted on the mounting member on opposite sides of a disc to be acted upon the brake pads. The brake pads are mounted on backing plates which have circumferential ends disposed in facing relationship to torsion-resisting surfaces of the mounting member. The torsion-resisting surfaces have circumferentially extending projections which engage the backing plates in a manner resisting radial outward movement of the brake pads in response to frictional braking forces.

Abstract: An air-fuel ratio control apparatus for an engine for controlling a fuel injection amount so that an air-fuel ratio of a mixture gas which is supplied to the engine is set to a stoichiometric air-fuel ratio is disclosed. The apparatus has a first oxygen concentration sensor on the upstream side of a catalyst arranged in an exhaust pipe of the engine and a second oxygen concentration sensor on the downstream side, respectively. The first sensor gives to the apparatus a first linear detection signal for the air-fuel ratio of the mixture gas. The second sensor gives to the apparatus a second detection signal indicating whether the air-fuel ratio of the mixture gas is rich or lean for the stoichiometric air-fuel ratio. A target air-fuel ratio is set in accordance with the second detection signal and the first detection signal and the target air-fuel ratio are compared, thereby controlling a fuel injection amount.

Abstract: Disclosed is an electrodeposition coating composition for use in printed circuit board photo resist, comprising (a) an acrylic resin containing (meth)acryloyl group and obtained by use of diacetone (meth)acrylamide as an essential monomer component, said acrylic resin being a water-soluble or water-dispersible photo-curable unsaturated resin having an acid value of 20 to 300, a degree of unsaturation of 0.2 to 4.5 moles/kg, a number average molecular weight of 1,000 to 100,000 and a glass transition temperature of 0.degree. to 100.degree. C., and (b) a water-insoluble photopolymerization initiator.

Abstract: An engine control valve is disclosed which comprises a first bypass passage for introducing auxiliary air flow to an engine from an upstream side of an intake throttle valve disposed in an air intake pipe of the engine while bypassing the intake throttle valve; a second bypass passage having an inlet port in communication with an outlet port of the first bypass passage, for introducing the auxiliary air flow, introduced through the inlet port, to a downstream side of the intake throttle valve; a valve body for changing an opening area of at least one of the outlet port of the first bypass passage and the inlet port of the second bypass passage, thereby adjusting an amount of the auxiliary air flow to be introduced from the upstream side to the downstream side of the intake throttle valve; and a drive unit for driving the valve body in accordance with a drive signal outputted from the control unit.

Abstract: A disc brake assembly includes a disc rotor rotated with a wheel in a body, a mounting member fixed to a stational member of vehicles and having an arm portion in which a pair of grooves extending toward to the axial direction of the disc rotor are provided therein. A brake pad disposed to at least one side of the disc rotor and having a pair of ear portions which are outwardly projected at the center portion or the outer side of both ends in the rotational direction of the disc rotor of its backing plate, respectively and which are fitted into a pair of groove portion formed in the arm portion of the mounting member and slidably supported on the arm portion of the mounting member toward to the axial direction of the disc rotor.

Abstract: An ultrasonic diagnostic apparatus which has a probe including a plurality of transducer elements made of an electrostrictive material arranged on a plane in two-dimensional directions, a bias applying unit for selecting the transducer elements in an arbitrary row in the horizontal direction to be in an operative condition by applying the same with a bias voltage, and a switching unit for selecting the transducer elements in at least one arbitrary column in the vertical direction by applying the same with a bias voltage, and controls the bias voltage applying unit and the switching unit to scan an ultrasonic beam in the two-dimensional directions to collect three-dimensional information on a body under inspection.