Abstract: The invention is directed to an ignition arrangement for an internal combustion engine of a handheld portable tool such as a chain saw or the like. The engine has a crankshaft and a fan wheel is seated on the crankshaft for rotation therewith. The ignition arrangement includes a permanent magnet. The magnet has two pole shoes and an exciter coil is mounted on the permanent magnet. The permanent magnet equipped in this way is fixedly mounted on the tool to save weight. A relatively light self-supporting annular member with projections is mounted in the fan wheel. The projections of the annular member and the permanent magnet with its pole shoes conjointly define a magnetic circuit. As the projections pass the pole shoes at a minimal spacing therefrom during operation of the engine, the projections alternately open and close the magnetic circuit thereby causing changes in the flux of this circuit.

Abstract: In order to insure that, even when there arises a change in the rate of air flowing through an intake mixture passageway, the air-fuel ratio of the mixture which is to be supplied to an engine is always kept constant, the fuel control system comprises: an intake mixture passageway having a first negative pressure generating section and a second negative pressure generating section provided upstream of the first negative pressure generating section for generating a negative pressure weaker than that in the first negative pressure generating section; a fuel passageway having its one end opening in the first negative pressure generating section and its other end connected to a float chamber via a fuel metering jet; an electromagnetic valve for controlling the rate of the fuel flowing through the fuel passageway; a negative pressure passageway having its one end opening in the second negative pressure generating section and having its other end connected to the fuel passageway at a site located between the fuel m

Abstract: A device for injection of a two-phase mixture composed of fuel and carrier air into intake pipes associated with the individual cylinders of a multi-cylinder, mixture-compressing combustion engine, the device having carrier air apportioning means which apportions a carrier air current, branched off the intake manifold and conveyed by an air pump, to the injection lines associated separately with the individual cylinders of the combustion engine, a fuel injection valve is provided which injects the fuel by way of separate injection nozzles into the individual injection lines, the carrier air apportioning means is provided with a carrier air collecting space formed in a housing containing the injection valve, the collecting space surrounding the injection valve in annular manner and communicating, on the one hand, with the air pump and, on the other hand, with the injection lines, a carrier air reservoir is provided between the carrier air collecting space and the injection lines, which surrounds the injection

Abstract: In an electronic governor for an internal combustion engine provided with a fuel injection pump having a control rack for adjusting fuel supply, a constant speed control signal Vnd for control to maintain the deviation of the actual speed N from a designated speed No within a permissible range, and a maximum rack position control signal VLd for control to maintain the deviation of the rack position from the maximum position for the particular speed N within a permissible range, are inputted into a control mode selector, which outputs the constant speed control signal Vnd when a speed detection signal Vn is not smaller than a designated speed signal Vno, or when the speed detection signal Vn is smaller than the designated speed signal Vno and the rack is below the maximum position, and outputs the maximum rack position control signal VLd when the speed detection signal Vn is smaller than the designated speed signal Vno and rack is above the maximum position.

Abstract: A method of controlling the idle speed of an internal combustion engine is disclosed, in which the rotations of the internal combustion engine is detected by a crank angle sensor, the flow rate of air supplied to the engine is detected by an air flow sensor, the amount of fuel supplied to the engine is controlled by a fuel supply unit, an idle condition of the engine is detected by another sensor, and an abnormal condition with the engine speed exceeding a predetermined level in idle state is detected by an electronic control unit by use of electrical signals from the sensors. The number of times fuel is supplied to the engine is counted, and the fuel supply is suspended each time the count of the counter reaches a predetermined value.

Abstract: This invention relates to a control system for feedback control of the air/fuel ratio in an internal combustion engine, which may be an automotive engine, by using an oxygen sensor to detect actual values of the air/fuel ratio from the concentrations of oxygen in the exhaust gas. The control system has the function of temporarily shifting the feedback control of air/fuel ratio to open-loop control when any of predetermined transient operating conditions of the engine is detected. To resume the temporarily interrupted feedback control at an optimum time-point, the air/fuel ratio control system includes means to detect the degree of warm-up of the engine and means to variably determine the duration of the temporary open-loop control according to the detected degree of warm-up of the engine.

Abstract: A circuit and method for actuation of a gas intake or exhaust valve which is electromagnetically held in its opened and closed positions by an actuator assembly having a ferromagnetic element attractable by actuating solenoids. Control of the holding current flow through the solenoid coil is provided by a relaxation circuit element, and the excitation current is directly monitored and measured. Upon deexcitation of the coil and relaxation circuit-element activation, the decay current is not measured but is instead simulated. The relaxation circuit is supplied with pulsed current during the stationary phase of the valve, the current being measured in the pulse cycle during current supply, and is turned off upon exceeding a ceiling value. After the decay current has reached a threshold value, the current is turned on and permitted to rise momentarily. It is thereafter cycled off and on between an I.sub.1 and I.sub.2 value which is only about 10-20% of I.sub.max, the capture current.

Abstract: A fuel delivery system particularly useful for supplying petroleum distillate fuels to a fuel combustion device is described. When such device is operated in cold ambient conditions, fuel clogging can occur in the fuel supply lines. In the past, attempts to overcome such problems have been directed toward applying heat to the portions of the conduits subject to restrictions or by introducing solvents into the fuel. These steps are, however, unsatisfactory. In accordance with this invention, the fuel supply conduits are drained of fuel upon shut-down of the associated engine or other fuel fired device. Upon an engine start-up command, a small quantity of fuel is warmed, preferably using an electric immersion type heater. Once a sufficient fuel temperature is reached, the fuel conduits are reprimed with fuel. Since the fuel does not cold soak in these conduits, fuel clogging problems are eliminated. Various methods for venting the fuel supply conduit enabling such purging and priming is described.

Abstract: This invention relates to a blocking oscillating converter for transferring energy from a source of power, such as a vehicle battery, to a storage means, such as an energy storage capacitor in a capacitor discharge ignition system. A novel control and feedback circuit incorporated in the blocking oscillator allows the drive level to the switching transistor to be controlled in response to the peak current in said transistor as well as the output voltage of the blocking oscillator. Furthermore the control circuit allows the blocking oscillator to be turned off during the short period of time after each spark discharge that is needed for turnoff of a switching device used to control that discharge.

Abstract: A vapor control valve (12) and system therefor for controlling fuel tank (14) pressure and for purging hydrocarbons from a storage canister (16) comprising a single electrical coil (44) responsive to control signals, wound about a carrier or bobbin (34) including a central passage (36) and means for dividing said central passage into first (40) and second (42) axially aligned portions; a first piston (60) slidably received within said central passage at said first portion (40); a second piston (80) slidably received within said central passage at said first portion (42); a first valve seat (132) for receiving said first piston; a second valve seat (106) for receiving said second piston, a first spring (66) for biasing said first piston into said first valve seat; a second spring (90) for biasing said second piston into said second valve seat, wherein the spring constant of said first spring is less than the spring constant of said second spring.

Abstract: A valve obstructs flow of fuel vapor to an engine induction passage both when the engine is not operating and when the engine is operating with a closed throttle, and varies flow of fuel vapor to the induction passage when the engine is operating with an open throttle.

Abstract: A marine propulsion device comprising a mounting assembly adapted to be mounted on the transom of a boat, and a propulsion unit mounted on the mounting assembly for pivotal movement relative thereto about a generally vertical steering axis, the propulsion unit including a rotatably mounted propeller, and an internal combustion engine drivingly connected to the propeller, the engine comprising an engine block, a timing member mounted on the engine block for movement relative thereto in opposite advance and retarding the spark timing of the engine, a releasable lock for preventing movement of the timing member in the retard direction, and an operator actuatable mechanism for releasing the lock and moving the timing member in the retard direction, and for moving the timing member in the advance direction.

Abstract: An ignition timing control method for an internal combustion engine having a catalytic exhaust emission purifier for scrubbing toxic exhaust gas components from engine exhaust gases by means of a catalyst, wherein the timing at which a mixture in the engine is ignited is controlled on the basis of an ignition timing set in dependence upon operating parameters of the engine. The method comprises the steps of sensing temperature of the engine after the engine is started, sensing elapsed time from the moment the engine is started when the sensed temperature lies within a predetermined temperature range, setting a delay angle correction amount in dependence upon the sensed elapsed time, correcting the ignition timing by the set delay angle correction amount, and controlling the ignition timing in accordance with the ignition timing so corrected. Preferably, the correction of the ignition timing is effected only when a particular operating condition of the engine is sensed.

Abstract: A fuel vapor control device having a valve opening and closing a passage connecting a carburetor and a charcoal canister according to a predetermined temperature. A first coil spring formed by a "shape memory effect" alloy is provided to urge the valve to open the passage when the temperature is high. A second coil spring urges the valve to close the passage. A solenoid is provided to urge an armature against the valve to close the passage against the force of the first coil spring when the engine is running. The solenoid heats the first coil spring to generate a spring force therein when the engine is running. When the engine is turned off, the solenoid is deactivated, and the force of the first spring overcomes the force of the second spring to open the passage until such time as the temperature of the first spring drops below the predetermined temperature.

Abstract: Device for purging evaporated fuel captured by a charcoal canister from a fuel supply system of an engine. A purge path connects the charcoal canister to an engine intake path, an ON-OFF valve and a fixed throttle are arranged in parallel in the purge path, and a solenoid valve is provided in the purge path between the engine intake path and the parallel ON-OFF valve and fixed throttle. The solenoid valve is opened only at low engine speeds and low engine temperatures. The ON-OFF valve is opened at engine loads higher than a predetermined engine load and is closed at engine loads lower than the predetermined engine load. In this way, purging of the evaporated fuel is cut off at low engine speeds and low engine temperatures, purging is occurs small quantity at low engine loads, and purging is increased at high engine loads, providing increased capturing ability of the charcoal canister without impairing drivability.

Abstract: An injector apparatus for an internal combustion engine and suitable for injecting two different fuels, namely a "pilot injection" liquid fuel and a "main injection" liquid or gaseous fuel comprising a low-pressure pump (1B) for pilot injection fuel feed, a high-pressure pump (1A) of the injection pump type, two fuel injectors, and a metering pump (30) selectively connecting the low-pressure pump, the high-pressure pump, and the two fuel injectors. The metering pump (30) includes a transfer piston (2) and two abutments (3, 4) which are independently adjustable so as to vary the relative importance of pilot injection and of main injection and also vary the extent to which the two injection stages overlap.

Abstract: A fuel injection system according to the present invention comprises a fuel injection nozzle for injecting a supplementary fuel prior to injection of a main fuel, a distributor-type fuel injection pump for supplying the main fuel to the nozzle, a supplementary fuel feed pump for delivering the supplementary fuel to the nozzle, a relief valve for adjusting the pressure of the fuel from the feed pump to a fixed level, and a supplementary fuel feed valve disposed between the relief valve and the nozzle. The open period of the feed valve is controlled in accordance with the operating state of the engine.

Abstract: A structure for mounting a sub-combustion chamber in an internal combustion engine includes a ceramic sub-combustion chamber and a metal casing separated therefrom by an adiabatic air gap. The air gap is locate opposite to a portion of the external surface of the casing that is in contact with a cylinder head so that the negative effects of differences in the thermal characteristics of the sub-combustion chamber, the casing, and the cylinder head are eliminated.

Abstract: An air-to-fuel ratio of an air-fuel mixture in an engine is controlled via a fuel supply system. The fuel supply system operates in accordance with a signal representing a desired air-to-fuel ratio of an air-fuel mixture in the engine. When the fuel supply system operates normally, an actual air-to-fuel ratio of the air-fuel mixture can be essentially equal to the desired air-to-fuel ratio. An actual air-to-fuel ratio of the air-fuel mixture is detected. A malfunction of the fuel supply system is detected in accordance with the detected actual air-to-fuel ratio and the desired air-to-fuel ratio. In the case where the fuel supply system includes fuel injection valves and an air-to-fuel ratio sensor is disposed in an exhaust passage of the engine, a malfunction of at least one of the fuel injection valves may be detected in accordance with whether or not an output signal from the air-to-fuel ratio sensor changes periodically in synchronism with operation cycles of the engine or revolution of the engine.

Abstract: Fuel injection is adjusted in accordance with an air-fuel reation feedback correction coefficient which is calculated in accordance with a concentration of a specific compound in the exhaust gas of an engine. At least one of the amplitude and frequency of the air-fuel ratio feedback correction coefficient is controlled in accordance with the intake air flow of the engine.