Abstract: An electronically controlled fuel injection system for an internal combustion engine, the system being of the type which controls fuel injection using the charging and discharging of a capacitor and comprising engine operating parameter sensors, a capacitor, and a control unit for controlling the charging and discharging of the capacitor. The charging of the capacitor is initiated at a timing determined as a function of engine speed and throttle opening angle and the discharging thereof is initiated subsequently to the completion of the charging. The charging time period is determined by engine speed and the discharging current is determined by intake air quantity. A basic fuel injection signal is produced so as to have a pulse duration equal to the discharging time period.

Abstract: In the scanning type ultrasonic equipment provided with a probe a plurality of transducer elements and with a phasing circuit for signals which are delivered from the transducer elements on the basis of a received ultrasonic wave, the phasing circuit includes constant current circuits each for converting selected ones of the signals from the transducer elements into a constant current signal, and a delay line having taps which are connected to the constant current circuits, in order to reduce the number of parts included in the phasing circuit and the number of adjusting operations performed therein.

Abstract: An .alpha.-amino acid is effectively separated and recovered from an aqueous solution containing at least an .alpha.-amino acid and its corresponding .alpha.-amino acid amide by performing ion-exchange electrodialysis in the presence of ammonia. A reaction product liquid obtained by biochemical asymmetric hydrolysis of a D, L-.alpha.-amino acid is used preferably as the raw material aqueous solution for dialysis.

Abstract: A sliding caliper disc brake includes a caliper slidably mounted on a fixed torque-taking member to urge one friction pad onto one side of a rotatable disc and having a fluid actuated piston which urges the other friction pad onto the other side of the rotatable disc. The caliper is connected to the torque member by a pin so as to permit sliding of the caliper in an axial direction of the rotatable disc and also pivoting of the caliper with respect to the torque member. The pivoting of the caliper in the inward direction is restrained by an extension which is formed on the caliper and is in contact with the torque member while the pivoting of the caliper in the outward direction is restrained by a link plate which is oscillatingly disposed on one friction pad and is in contact with the caliper.

Abstract: In an electronic fuel injection control system for an internal combustion engine, a first integration circuit is responsive to an angular signal with a time period in inverse proportion to the rotational speed of the engine for integrating the first half of the time period of the angular signal and for producing a first integration signal indicative of a resultant value of the integration, a hold circuit is arranged to hold the value of the first integration signal upon lapse of the first half of the time period and to produce a hold signal of the held value and maintain it for the second half of the time period and the first half of the time period of the following angular signal, a second integration circuit is responsive to the angular signal for integrating the value of an air quantity signal indicative of the quantity of air drawn into the engine at each start of the first and second halves of the time period and for producing a second integration signal indicative of a resultant value of the integration

Abstract: A multielement acoustic transducer comprising a metal plating which is formed by plating the convex surface of a low-melting metal having a plurality of convex semispherical holes and then fusing and removing the low-melting metal, the metal plating being used as a base electrode, a piezoelectric material which is formed on the base electrode, and a top electrode which is formed on the piezoelectric material, the piezoelectric material functioning as concave transducer elements.

Abstract: A wear-limit warning device for a vehicle disc brake, warning the vehicle driver that a maximum permissible wear limit is reached on the friction pad or pads. The warning device comprises a projection protruding sideways from the end face of a backing plate of each friction pad, and a warning member made from a spring sheet material. The warning member consists of a mounting leg portion, a contact portion and a spring portion connecting the leg and contact portions. The leg portion having a pair of legs which grip therebetween an end portion of the backing plate and the protruding projection thereby attaching the warning member to the backing plate and preventing the same from being shifted out of position during service. The contact portion extends along the end face of the projection until its end reaches a permissible wear limit level of the friction member of the friction pad, and is pressed against the end face of the projection with a resilient force of the spring portion.

Abstract: A fuel injection control for an internal combustion engine having electromagnetic fuel injectors determines a basic fuel injection time width of a fuel injection pulse signal applied to the electromagnetic fuel injectors in accordance with detected conditions of engine operation parameters, stores maximum fuel injection time width values predetermined in correspondence to values of a predetermined one of the engine operation parameters, reads one of the predetermined maximum fuel injection time width values corresponding to the values of the predetermined engine operation parameter and corrects the same in accordance with the values of the other engine operation parameters, and corrects the basic fuel injection time width in accordance with the corrected predetermined maximum fuel injection time width value, thereby controlling the air-fuel ratio at a desired air-fuel ratio under every operating condition of the engine, while simultaneously preventing a misoperation of continuous fuel supply from occuring in

Abstract: The air-to-fuel ratio of a combustible mixture supplied to an engine is controlled by a feedback loop which includes an integration circuit for integrating the output signal of an oxygen sensor which detects the oxygen concentration in the exhaust gases of the engine, to produce an output voltage. The output of the sensor is applied to the integration circuit through a switch which opens in response to predetermined conditions of the engine whereby the output voltage of the integration circuit is held at a value occurring just before the switch opens.

Abstract: An electronic control type fuel injection system in which, at the time of engine deceleration the fuel injection is stopped, and when resuming to a normal fuel injection from the fuel injection stopped condition, if the reducing rate of the engine speed is smaller than a preset value, a smaller amount of fuel than the amount of fuel injection during normal operation as if fuel injection had not been stopped is first injected and subsequently the amount of fuel to be injected is gradually increased, while when the reducing rate of the engine speed is larger than the preset value, a larger amount of fuel than the fuel injection amount during normal operation is injected.

Abstract: A sealing boot of elastomeric material for hermetically enclosing an annular opening between a support member and a movable member axially reciprocable on the support member, the sealing boot including a tubular bellows which is integrally formed at one end thereof with a first cylindrical sealing sleeve portion coupled over the support member and at the other end thereof with a second cylindrical sealing sleeve portion coupled within the movable member, the sealing boot being characterized in that the first cylindrical sealing sleeve portion being connected substantially at its center to the one end of the tubular bellows and being formed at its inner end shoulder with an annular thick wall tapering radially toward the inner wall surface of the tubular bellows.

Abstract: In an air-fuel ratio control system for an internal combustion engine, the basic fuel injection amount computed from engine parameters such as engine speed and intake air flow is corrected by using map having air-fuel ratio compensation data stored battery back-up in accordance with the engine parameters. The compensation data is read out of the map in accordance with the parameters at the time of detection of the stable combustion state of the engine. When an output of an oxygen sensor is on lean side, a predetermined amount is added to the data thus read, while when the output of the oxygen sensor is on rich side, a predetermined amount is subtracted from the data thus read, thereby renewing the stored value.

Abstract: An apparatus for controlling the atomization of fuel in an electronically fuel injection device for internal combustion engine, by jetting air or exhaust gas into the injection device so as to mix the air or the exhaust gas with the fuel thereby to atomize the fuel. The apparatus has a regulator adapted to maintain the pressure of the air or the exhaust gas at a level higher than the pressure in the main air passage by a predetermined pressure. The regulator has a housing in which a back pressure chamber and a control chamber are defined at both sides of a diaphragm accommodated by the housing. The back pressure chamber receives the air pressure transmitted from the downstream side of a throttle valve and accommodates a spring which urges the diaphragm toward the control chamber, while the control chamber receives the air from the upstream side of the throttle valve or the exhaust gas.

Abstract: In a closed loop control system for air/fuel ratio control of an internal combustion engine, an integration correction factor is derived from the output signal of a gas sensor indicative of the concentration of an exhaust gas component, and an engine condition correction factor is selected from a memory in which a plurality of engine condition correction factors are prestored in the form of a table. The engine condition correction factor is renewed in accordance with the variation in the value of the integration correction factor so as to perform learning control. In order to prevent each of the engine condition correction factors from assuming an undesirable value which are far deviated from its standard, a constant or variable limit value is set. The limit value may be set by calculating some typical engine condition correction factors.

Abstract: A device for warning the allowable wear-limit of a pad assembly in a disc brake. The device comprises (a) a vibration member composed of (i) a fixing portion secured to a lateral end portion of a backing plate of the pad assembly, (ii) a spring portion bent into a curve as an extension from the fixing portion for being located on the rear side of the pad assembly, and (iii) a vibrating portion extended from the spring portion, passing through between the lateral end portion of the backing plate and a torque member movably supporting the same, toward the friction surface of the disc rotor as far as almost reach at a tip thereof a wear limit of the pad assembly, (b) a supporting member supporting the vibrating portion at a root portion thereof against biasing force of the spring portion, and (c) a projection disposed on either the supporting member and the vibration portion for determining contact position therebetween.

Abstract: An electronic control system for fuel injection into an engine controls an air-fuel ratio at a desired air-fuel ratio during a high load operation of the engine. The electronic control system performs the operations of detecting operating parameters of the engine, computing by a computing unit a time width in accordance with the detected operating parameters, selecting a maximum time width value of the injection pulse from a preliminarily stored table of maximum time width values thereof in accordance with the value of at least one of the detected operating parameters, comparing the computed time width value with the selected maximum time width value, limiting the computed time width value in accordance with the selected maximum time width value, and applying the injection pulse to the fuel injectors, thereby controlling the air-fuel ratio under the high load conditions at a desired air-fuel ratio and also preventing the malfunction of continuous fuel supply from occurring in the fuel injectors.

Abstract: A method and an apparatus for controlling the air-fuel ratio in an internal combustion engine in which the calculation of the presumed amount of fuel attached to the wall of the intake port of the engine is effected for correcting the amount of the fuel supplied to the engine in order to compensate for the variation of the air-fuel ratio of the air-fuel mixture used in the combustion of the engine.

Abstract: An improved disc brake caliper housing structure including a cylinder portion which has a cylinder wall section formed with a cylinder having a cylinder bore, a reaction portion located opposite to the cylinder portion axially of the cylinder, and a bridging portion connecting the cylinder and reaction portions. The bridging portion has a cross section, taken perpendicularly to the axis of the cylinder, which is of substantially circular arc configuration along the periphery of a disc rotor, and the cylinder wall section which has a fan-shaped profile to which the circumferential wall of the cylinder is virtually inscribed, has openings spaced radially of the cylinder. The openings are formed between both ends of the circular arc of the bridging portion, and those two segments of the circumferential wall of an open end portion of the cylinder which are nearest to the both ends of the bridging portion radially of the cylinder.

Abstract: A sealing boot of elastomeric material for hermetically closing an annular opening between support and movable members in relatively reciprocable relationship, the sealing boot including a tubular bellows portion which is integrally formed at the opposite ends thereof with a pair of cylindrical sealing portions respectively attached to the support and movable members, and wherein one of the cylindrical sealing portions is formed with a cylindrical sealing surface to be tightly in contact with the outer circumference of either the support or movable member and is further formed at its inner end with an annular flank which is curved radially away from the cylindrical sealing surface.

Abstract: A closed loop mixture control system for internal combustion engines is responsive to a signal derived from an exhaust gas sensor. The sensor signal is time-integrated in a direction depending on the level of the gas sensor output to derive a first mixture corrective setting of the control system. Second corrective settings or learning data are established for the control system in correspondence with the amount of air supplied to the engine. Each of the latter settings is varied as a function of time in a direction depending on the value of the time-varying first corrective setting relative to a reference so that the second settings are automatically updated to meet varying engine performance such as aging. One of the second corrective settings is selected in response to the detected quantity of the supplied air and multiplied by the first corrective setting to correct the basic mixture control setting of the system toward an optimum value.