Abstract: An internal combustion engine comprising an activating chamber provided separate from a combustion chamber, a valve disposed between the activating chamber and the combustion chamber, fuel feeding means adapted to feed fuel into the interior of the activating chamber in accordance with a predetermined ignition timing sequence and valve opening and closing control means for opening the valve in accordance with the predetermined ignition timing sequence.

Abstract: There is disclosed a fuel cutoff apparatus for use in an engine-driven vehicle. The apparatus comprises a fuel supply means for supplying fuel to the engine, a hydraulically actuated means that is actuated in response to the pressure of the engine oil, and a fuel cutoff control means which, when the pressure of the engine oil decreases below a certain level, is actuated in response to the actuation of the hydraulically actuated means to control the fuel supply means in such a way that the supply of fuel to the engine is cut off.

Abstract: A method of controlling fuel supply to an internal combustion engine at the start thereof. A fuel quantity to be supplied to said engine is set in dependence on a temperature of the engine when the engine is in a predetermined starting condition, and the fuel quantity thus set is corrected to an increased value by means of a correction value which varies with a rise in the rotational speed of the engine. The varying rate of the correction value is set in dependence on the engine temperature such that the set fuel quantity decreases at a first rate with a rise in the engine rotational speed when the engine temperature is higher than a predetermined value, and at a second rate smaller than the first rate with a rise in the engine rotational speed when the engine temperature is lower than the predetermined value. The set fuel quantity is corrected by means of the correction value having its varying rate set as above while the engine is in the predetermined starting condition.

Abstract: A fuel-injection control system for an internal combustion engine capable of ensuring the stable and proper backup operation of the engine in case of a failure of an intake-air sensor without suffering from any substantial influence from the amount of intake air flowing through a bypass conduit which bypasses a part of intake air in an intake passage across a throttle valve.

Abstract: According to the invention, a combustion chamber for internal combustion engines is constructed by forming a combustion chamber recessed in the head portion of a piston, and disposing therein a fuel injection nozzle means that atomizes and supplies the fuel thereinto in such a manner that the plural number of fuel mists formed by the fuel injection nozzle means will strike the inner wall of the combustion chamber at intervals at the outside of the swirl generated in the combustion chamber but adhere to the combustion chamber inner wall flowing in the direction of the swirl. Therefore, the fuel so supplied does not cool the combustion chamber inner wall excessively, and itself is heated by the heat of the inner wall as well as by the heat of the compressed air so to vaporize easily, so that favorable dispersion and distribution of the mixture gas within the combustion chamber is ensured, developing stabilized power output and sustaining favorable combustion while suppressing the exhaust of HC and NOx.

Abstract: In determining an optimum target fuel ignition timing in accordance with the engine operating conditions, including at least an engine load and an engine speed, the target ignition timing is determined on the basis of a corrected engine load and a corrected engine speed. The corrected engine load and corrected engine speed are obtained by making corrections, according to the engine operating conditions, to a detected engine load and a detected engine speed, respectively. In this way, the optimum target fuel ignition timing according to the engine operating conditions can be obtained without directly detecting a fuel injection quantity.

Abstract: An idling speed control system for controlling idling rotational speed of an internal combustion engine. A vacuum-operated actuator having a diaphragm defining a vacuum chamber controls opening and closing of a throttle valve in response to first and second control pressures supplied from a change-over control valve to the vacuum chamber. An electronic control unit generates, in response to an on-off control pulse signal having a period corresponding to rotational speed of the engine, one of on-period and off-period of the on-off control pulse signal having a predetermined constant value, and supplies the change-over control valve with the control pulse signal. Preferably, a detector is connected to the electronic control unit for detecting a change in the magnitude of a load on the engine and supplying the electronic control unit with an output signal indicative of the detected change in the load magnitude.

Abstract: A fuel injection control apparatus includes a booster apparatus, in which a cylinder chamber is divided into first and second fluid chambers by a piston. The operative area of the piston facing the first fluid chamber is sufficiently greater than that facing the second fluid chamber. Pressurized fuel is supplied to the first fluid chamber through a first check valve. The fluid is delivered from a second fluid chamber to a fuel injection valve via a second check valve. A fluid passage is formed between the first and second fluid chambers. A third check valve is set in the fluid passage, whereby the fuel is allowed to flow only from the first fluid chamber toward the second fluid chamber. The booster piston is located by means of a first piezoelectric device which includes a plurality of piezoelectric elements stacked in layers. When high voltage is applied to the first piezoelectric device to extend it, the piston is moved toward the first fluid chamber.

Abstract: A portable lamp, especially for mounting on the head of the user, includes an adjustment collar designed to ensure displacement of the reflector causing a variation of the light beam focus, and operation of the bulb switch. The lamp comprises a single casing having an insulating body subdivided by an intermediate wall into a first rear compartment housing the power supply unit, and a second front compartment housing the bulb and the adjustable focusing device. The wall is provided with a communication orifice between the two adjacent compartments, and with a fixed sleeve to house the bulb. The switch is composed of an elastic contact blade cooperating with a flange of the reflector. Refer to FIG. 1.

Abstract: An air/fuel ratio control system for an internal combustion engine having an air supply system for controlling the air/fuel ratio of mixture to be supplied to the engine, and an oxygen concentration sensing device for sensing the oxygen concentration in the exhaust gas of the internal combustion engine. The oxygen concentration sensing device includes a pair of solid electrolyte members operating as an oxygen pump element to which a pump current is supplied, and a sensor cell element. An open/close valve is provided in the air supply system and controlled by a duty ratio control circuit which causes the open/close valve to be opened for a calculated valve open time period in each of successive predetermined cycles in response to a result of detection of air/fuel ratio. When the calculated valve open time period exceeds a predetermined upper limit, the supply of the pump current is stopped so that the blackening phenomenon of the solid electrolyte members is avoided.

Abstract: Two or more valves which are positioned opposite one another relative to a center plane in which the cylinder axis and the crankshaft axis are located and which are arranged in the cylinder head in a parallel, upright position, are actuated via separate cams and levers by a camshaft which is spaced from the center plane and extends in parallel with the crankshaft. The lever actuating the valve on the same side of the center plane as the camshaft is configured as a one-armed lever which is positioned underneath the camshaft and is supported by a bearing on the cylinder head. The lever actuating the valve on the other side of the center plane is configured as a rocker lever, its axle being situated above the one-armed lever, parallel to the camshaft.

Abstract: In an internal combustion engine, a heater for heating an air-fuel ratio sensor provided in the exhaust gas flow passage is controlled in accordance with a parameter of a load of the engine. That is, the heater is turned ON when the load parameter is not larger than a predetermined value, and the heater is turned OFF when the load parameter is larger than the predetermined value. The turning OFF of the heater is delayed with a predetermined delay time when the engine rotational speed is lower than a predetermined value, and the turning ON of the heater is delayed with the predetermined delay time when the engine rotational speed is higher than the predetermined value. Thus, the number of times that the heater is turned ON and OFF is decreased, thereby prolonging the life of the heater.

Abstract: In a fuel injection apparatus for an internal combustion engine which has a fuel injection pump having a plunger and one control sleeve fitted on the plunger and capable of regulating both the fuel injection quantity and the timing of the beginning of fuel injection by the adjustment of the relative positional relationship therebetween, and a control unit for controlling the positional relationship in order to obtain the optimum fuel injection rate and fuel injection quantity, the apparatus comprises a detector for detecting any trouble occurring in the control system for regulating the position of the control sleeve and a limiting circuit for limiting the control operation by the control unit so that an excessive rise in the inner pressure of the cylinders in the internal combustion engine is prevented when the occurrence of the trouble is detected by the detector.

Abstract: An outer vent control device for use with a carburetor includes a valve housing adapted to be attached to the outer wall of a float chamber in thermally conductive relation, a first control valve disposed in the valve housing and openable when the engine stops its operation, and a second thermosensitive control valve disposed in the valve housing and closable when the temperature of the float chamber drops below a preset temperature. The second thermosensitive control valve includes a thermosensitive unit and a cover attached to a valve housing thereof in covering relation to the thermosensitive unit. The second thermosensitive control valve also has a valve seat member with a valve seat disposed in the valve housing and a valve body movably disposed in the valve housing and seatable on the valve seat. The valve body has an upper conical surface facing an inlet port remotely from the valve seat. The cover has a ventilation hole defined in the bottom thereof at a lowermost position thereon.

Abstract: An apparatus for controlling an internal combustion engine having a plurality of cylinders and fuel injectors provided for the respective cylinders. The apparatus includes a digital computer for calculating a value for fuel delivery requirement based upon various engine operating conditions. The digital computer provides a control signal in response to a demand for engine acceleration. A control circuit is coupled between the digital computer and the fuel injectors for generating synchronous fuel injection pulses having a pulse width corresponding to the calculated value to drive the fuel injectors in synchronism with engine rotation. The control circuit generates an asynchronous fuel injection signal to drive the fuel injectors so as to provide an additional supply of fuel to the engine in response to the control signal.

Abstract: A learning and control apparatus for an electronically controlled internal combustion engine having such an object of control as the air-fuel ratio in an air-fuel mixture or the idle rotation number of the engine wherein a pulse duty signal corresponding to a basic control value is set according to engine driving states. The basic control value is corrected by adding an appropriate correction value to the basic control value. Feedback control is carried out so that the actual controlled value is made to follow the aimed control value, and a learning correction quantity is computed by learning said feedback control so that the feedback control amount is set as small as possible.

Abstract: An ignition system having a low voltage source serving as a starting point for producing of an ignition voltage at least one ignition spark gap via at least one ignition branch, said branch including a said ignition spark gap, a high voltage capacitor, a high voltage transformer for producing a voltage at the high voltage capacitor of at least the same order of magnitude as said ignition voltage, an auxiliary spark gap having a breakdown threshold, and timing control means for controlling voltage delivery timing to said branch; wherein said auxiliary spark gap is disposed at an output side of said high voltage transformer and said high voltage capacitor is coupled to said auxiliary spark gap in a manner causing the high voltage capacitor to discharge to said ignition spark gap when the breakdown threshold of the auxiliary spark gap is exceeded; wherein the high voltage transformer has minimum inductances and minimum impedances; wherein a medium voltage transformer for producing a voltage between the low volta

Abstract: Disclosed is an apparatus for controlling at the time of idling the rotational speed of an engine having an injector for injecting fuel in proportion to the width of an input pulse. The control apparatus includes: a rotational speed sensor for cyclically detecting the rotational speed of the engine; an airflow meter for cyclically detecting the quantity of air being sucked into the engine; an idle switch for detecting the complete closing of a throttle valve; a judging means for judging that the engine is in the idling condition on the basis of the output of the idle switch and the output of the rotational speed sensor; and an operating means for cyclically outputting the injector a fuel injection pulse having a pulse width obtained by the following expression on the basis of the output of the rotational speed sensor and the output of the airflow meter when the judging means has judged that the engine is in the idling condition.Tp.sub.1 =k(Qa.sub.1 /N.sub.1).multidot..alpha.+Tp.sub.0 .multidot.(1-.alpha.)Tp.

Abstract: An airstream driven rotor assembly with a centrifugal pump forcing a measured fuel quantity through a fixed orifice in direct substantially linear proportion to rotor speed and thus to airstream volume. The ultimate fuel-air ratio is corrected for optimum operation by slightly changing, in response to measured parameters, one of the mixture constituents. In one embodiment, the fuel discharge bore (9) of a rotor (7) is dimensioned that the rotor carburetor (2) produces a lean mixture with a .lambda.-value which is constant for all operating points approximately 1.25. For fuel-air ratio correction additional fuel is brought into atomization ring (11) of rotor (7), by which the fuel-air ratio in the lean mixture is changed and at the engine operating points the .lambda.-values are adjusted to give most favorable fuel consumption, output and pollution.

Abstract: A knock sensor is provided on a selected cylinder which is most liable for engine knocking to occur. The ignition timing is corrected in accordance with the occurence of knock in the selected cylinder. The corrected ignition timing is stored in a table for operating all cylinders of the engine.