Abstract: A method of electronically controlling an operating amount of a control means for controlling operation of an internal combustion engine, such as a fuel injection control means. When the engine is operating in a predetermined low load condition, a desired operating amount of the control means is determined in dependence on the detected value of a first engine operating parameter indicative of loaded conditions of the engine, whereas when the engine is not operating in the predetermined low load condition, the desired operating amount of the control means is determined in dependence on the detected value of a second engine operating parameter indicative of loaded conditions of the engine.

Abstract: A spark control apparatus (1) for an internal combustion engine using a breaker point (3) or solid state (5) ignition to control current to an ignition coil (11). The waveform of the ignition signal from the ignition system is applied to a converter section (35) of the apparatus to convert the signal waveform to a predetermined waveform. A sensor (25) senses engine vibration and generates a representative electrical signal which a signal processor (41) processes to determine engine knock by comparing the peak and average values of the signal. A delay circuit (45) delays termination of current to the ignition coil and thus the ignition timing as a function of the comparison of the peak and average values of the control signal. When there is no knock, the timing slowly returns to normal. A driver (50) responds to current signals to control current to the ignition coil. The driver is shut off when the engine is not running to reduce current drain.

Abstract: An extended range throttle body fuel injection system wherein overlapping or near-overlapping fuel quantity pulse width signals are compensated to maintain the operation of the injectors in a near linear operating mode. The system is capable of being implemented in software for controlling microprocessors in a microprocessor based system or in hardware logic for operation in a hardware system.

Abstract: A system for regulating the idle speed of an internal combustion engine. The engine has an alternator, and a voltage regulator having a Darlington circuit connected between an end of a field winding of the alternator and the ground. The Darlington circuit is responsive to the output voltage of the alternator for controlling the current flowing a field winding of the alternator so as to regulate the output voltage of the alternator. The system has an integrator for integrating the voltage across the Darlington circuit and a comparator for comparing the output voltage of the integrator with a reference voltage and for producing an output voltage dependent on the comparison.A solenoid is operatively connected to a throttle valve of the engine.A switching transistor circuit is provided to respond to the output voltage of the comparator for allowing the current to pass through the solenoid and for actuating the throttle valve to regulate the idle speed.

Abstract: The invention relates to an electronically controlled ignition system in which a correction signal is obtained from a control signal derived directly from an ignition pulse sensor. The invention consists of producing a saw-tooth signal with a rising flank and a falling flank within one cycle of the square wave control signal, using only one flank of the said control signal. The ratio or relationship between the gradients of the two flanks is a measure of the change in the corrected signal relative to the control signal. The electronically controlled ignition system is particularly suitable for compensating for the ignition advance, caused by an induction sensor, as compared to the mechanical position of the rotor at low engine speeds.

Abstract: An internal to be at engine is provided with an engine cooling system by which the amount of cooling water introduced to a radiator is changed in accordance with engine load, so that the temperature of the cooling water is controlled to be at lower levels during a high engine load mode operation than during a low engine load mode operation. Additionally, an ignition timing control system of the engine is arranged to retard the ignition timing for a time period immediately after engine operation is shifted to the high engine load mode, thereby effectively preventing engine knock from arising when the engine operation is shifted to the high engine load mode.

Abstract: A break ignition plug for piston engines wherein an electromagnet acts upon an armature which activates a movable electrode and an ignition pulse passes through the magnet coil of the electromagnet and a short-circuit path between the electrodes. The magnetic field which builds-up in the electromagnet causes breaking of the short-circuit path and spark formation. At the free end of blade or band springs arranged in spaced relationship from one another at the lengthwise axis of the ignition plug there are provided confronting electrode heads. The blade springs are retained at the magnet core and freely protrude by means of the electrode ends into a hollow space or chamber formed at a threaded portion of the ignition plug. At a magnet gap region of the core there are formed at the blade springs armatures which repel one another upon excitation of the electromagnet.

Abstract: Idling speed of the internal combustion engine is controlled to a predetermined engine speed by correcting an engine operating parameter, such as, an ignition timing, the quantity of fuel injection, etc., to suppress a variation rate of the engine torque. Instead of detecting the torque variation rate directly, an engine speed variation rate is detected, and a correction value of the engine parameter is determined as a function of the engine speed variation rate based on the finding that the torque variation rate can be approximated as the engine speed variation rate with a fixed phase difference therebetween. Since the phase difference is determined by the engine speed, a correction value at the present moment is obtained from the previously obtained correction value which is preceding by the phase difference.

Abstract: A method comprising correcting the air/fuel ratio of a mixture being supplied to an internal combustion engine, by the use of a correction coefficient determined as a function of detected values of atmospheric absolute pressure and intake pipe absolute pressure. A device is also provided, which includes means for arithmetically calculating the correction coefficient as a function of outputs of sensors for sensing the two kinds of absolute pressure or means storing predetermined values of the correction coefficient for selective reading as a function of the sensor outputs, and means for correcting the valve opening period of a fuel injection valve by the calculated or read coefficient value.

Abstract: A process for intermittent control of a cyclically operating internal combustion engine wherein, in the succession of working cycles, working strokes are skipped--in approximately uniform distribution--and the number of skips is varied in dependence on the load. Fuel is fed in a controlled fashion only to the nonskipping working chambers of the internal combustion engine independently of the load in a constant quantity optimal for consumption. For a sensitive power distribution, especially in the low load range, the number of skips is varied chronologically at least approximately randomly and independently of the speed, i.e., the temporal density of the working strokes is varied. This can be accomplished by setting differently finely staggered firing patterns or by a stochastic ignition setting.

Abstract: A spark-plug assembly comprises a fitting mounted on the piston cylinder of an internal-combustion engine and formed with a generally closed firing chamber, at least one firing port extending between the firing chamber and the piston cylinder for fluid communication therebetween, and a storage compartment opening only into the firing chamber. The fitting being provided with a flame-blocking element or formation preventing the entrance of a flame front from the firing chamber into the storage compartment. This firing chamber is open substantially only to the storage compartment and to the piston cylinder. A spark plug has electrodes in the firing chamber. The electrodes form a spark gap lying in the firing chamber between the storage compartment and the port and the storage compartment opens only into the firing chamber.

Abstract: To provide ignition energy to respective spark plugs of a multi-cylinder internal combustion engine (ICE) without a distributor, winding groups, each including a primary and secondary winding, are located on respective core portions of an iron core, which core portions are coupled together by zones (a, b, c) of high magnetic reluctance, or low magnetic flux conductivity; the winding groups can be located on L cores (16, 17) with two high-reluctance gaps between the ends of the facing L cores (FIG. 1) or on a common U core (28, 30, 29) with a cross yoke (31) spaced from the ends of the legs of the U.

Abstract: In accordance with an amount of a change or a proportion of the change of at least one of operating parameters, such as a crankshaft rotational speed, an intake pipe pressure, etc., of an internal combustion engine equipped with an electronically controlled fuel injection system, or a rate of incremental change of the amount of the change or the proportion of the change and in dependence on whether air-fuel ratio feedback compensation by the use of an oxygen sensor is effected or not, at least one of control variables, such as a fuel injection quantity, ignition timing, etc., is corrected to ensure stable control of the rotational speed of the engine during its idling and low speed operations.

Abstract: The invention relates to an electric gas pedal for automotive vehicles having a desired-value transmitter 1 from which a desired-value signal can be fed to an electronic controller unit 3. The controller unit 3 controls by means of electric signals a setting member 4 which controls the motor power via a displacement device. In order to make optimum adjustment of this electric gas pedal possible in a simple and economical manner, the actual setting range possible for the displacement device is determined and stored as effective desired setting range of the controller unit 3 in the latter.

Abstract: A method for controlling the quantity of supplementary air being supplied to an internal combustion engine during idling operation thereof in a feedback manner responsive to the difference between the actual engine rpm and desired idling rpm. When the engine is operating in a decelerating condition with the throttle valve fully closed, a provisional value of desired idling rpm is set, which is larger than a proper value of desired idling rpm by a predetermined amount. The quantity of supplementary air is controlled in a feedback manner responsive to the difference between the actual value of engine rpm and the provisional value of desired idling rpm for a predetermined period of time from the time a predetermined condition of feedback control for bringing the engine rpm to the provisional value of desired idling rpm has been satisfied as a result of comparison between the actual value of engine rpm and the provisional value of desired idling rpm.

Abstract: In an internal combustion engine provided with a hot-wire air flowmeter and a canister for supplying fuel evaporated from a fuel tank into an intake passage, there exists a state where an excessively-rich mixture is supplied from the canister to the intake passage because of trouble of the canister and therefore engine stops. If the hot wire is heated in such a state as described above for removal of contaminations sticked onto the hot wire after an ignition switch has been turned off, there exists a problem such that rich mixture may be fired by the heated hot wire. To overcome this problem, an engine stop detecting means is additionally provided in order to inhibit the hot-wire from being heated up when the ignition switch is turned off after engine stop. That is, the hot wire is heated only when the engine is running before the ignition switch is turned off.

Abstract: A fuel supply control method for an internal combustion engine, in which while the rotational speed of the engine is lower than a predetermined value, the mixture is enriched either when a detected value of absolute pressure in the intake pipe of the engine is higher than a first predetermined value or when a detected value of the throttle valve opening is larger than a predetermined value, whereas while the rotational speed of the engine is higher than the predetermined value, the mixture is enriched when a detected value of the intake pipe absolute pressure is higher than a second predetermined value, thereby preventing an excessive increase in the bed temperature of the catalyst device of the engine, as well as ensuring required output performance of the engine.

Abstract: A method for controlling the air-fuel ratio in an internal combustion engine in which the correction of a base air-fuel ratio is carried out on the basis of the determination as to whether the base air-fuel ratio is on the richer or the leaner side of the air-fuel ratio corresponding to optimum specific fuel consumption, the determination being carried out by comparing four driving state indicating signals at different air-fuel ratios with each other, the correction being directed to bringing the base air-fuel ratio closer to the air-fuel ratio corresponding to the optimum specific fuel consumption.

Abstract: An ignition timing control circuit for internal combustion engine comprising a pulse generator which provides a pair of pulses in synchronization with the crank shaft rotation, a pair of polygonal wave generators for providing two types of polygonal waves, one having a constant amplitude, the other having a peak level which varies depending on the engine speed, and a comparator which detects the point of time at which the two waves have the same level and provides an ignition signal at this point, whereby the timing of ignition can be varied automatically, based on the engine speed.

Abstract: A piezoelectric sensor produces a first signal indicative of the pressure of fuel in a working chamber defined by the plunger housing and the inner end of a fuel distributing plunger reciprocating through the plunger housing. A threshold discriminator responds to the signal and produces a second signal indicative of the interval during which the first signal exceeds a fixed level. A counter counts clock pulses in the presence of the second signal and outputs its count value to a calculating unit which calculates a fuel injection quantity on the basis of the count value and engine speed sensed in accordance with the desired relationship amount count value, engine speed and fuel injection quantity.