Abstract: A method of controlling an internal combustion engine employs a microcomputer to control the fuel supply to the engine as well as the ignition timing thereof on the basis of measurement of the air quantity fed to the engine. For measuring the air quantity charged to the engine with high accuracy, the intake air flow fed to the engine is sampled in synchronism with the pulsating variation thereof. A value obtained by averaging the sampled values is used as the intake air quantity on the basis of which the fuel supply and the ignition timing are arithmetically determined.

Abstract: The output of a knock sensor for detecting a knock signal of an engine is applied to a bandpass filter for bandpassing only the knock signal. The output of the bandpass filter is applied to an automatic gain control circuit for variably controlling the gain of the knock signal. The output of the automatic gain control circuit is applied to an averaging circuit via a maximum clamp circuit. A comparator supplies an output to an integration circuit of the next stage when the output of the bandpass filter becomes greater than that of the averaging circuit. An ignition control device for controlling the spark timing of an ignition coil energizes the ignition coil by the output from a pick-up coil and that of the integration circuit and delivers a feedback signal to the integration circuit.

Abstract: In a method and a system for engine control an engine control signal is generated on the basis of a signal produced at each moment from at least one sensor for detecting the operating condition of the engine, the control signal being used for engine control. In order to attain the proper engine operating condition, data representative of the detection signal from the sensor is adjusted in advance, and data for correcting the sensor output is calculated from said adjustment value, the correction data being stored in a memory. While the engine is running, the data representative of the detection signal from the sensor is corrected by the correction data stored in the memory, and this corrected detection signal representative data is used to produce the control signal.

Abstract: An engine control system with a microcomputer is disclosed which controls the amount of fuel injection of a spark ignition engine having a fuel injection system. In each intake process of a cylinder of the engine, a regular fuel injection is effected. An acceleration fuel injection is effected only once in each interval of said regular fuel injection in the case where the task actuated in predetermined cycles regardless of the engine rotational speed decides that the engine is in an accelerated condition.

Abstract: A method and a system for engine control are disclosed. Electrical signals representing the engine operating conditions are detected, which electrical signals, together with the control data stored in a memory, are used to calculate a correction factor for correcting the control data for controlling the engine, where the correction factor is stored in a volatile memory, thus controlling the engine on the basis of the control data corrected by the correction factor. The correction factor stored in RAM is transferred to a non-volatile memory under predetermined conditions. Even if the voltage applied to RAM is reduced to a level lower than the storage ability of RAM, resulting in the loss of the stored data, the correction factor stored in EAROM is transferred back to RAM upon restoration of a normal voltage at RAM.

Abstract: An electronic type air/fuel ratio control system for use in gasoline engines comprises an accelerator, a detector of the manipulation angle of the accelerator, a shunt conduit by-passing a throttle valve, an air by-pass valve exposed in the shunt conduit for controlling flow rate of by-pass air, and a control circuit. The control circuit is responsive to the output of the accelerator manipulation angle detector and generates a control signal for the air by-pass valve, whereby the air/fuel ratio can be controlled with high accuracy when the flow rate of air is low.

Abstract: An electronic control apparatus for an internal combustion engine having engine parameter data sensors, an input/output unit, actuators and a data processing unit carries out a prescribed scenario for starting the engine. The starting sequence begins with the operation of a starting subsystem having a switch the state of which controls the operation of the starter motor. The starter motor is caused to be engaged and a set of initialization procedures are carried out by the data processing unit and input/output unit in dependence upon the state of the switch in the starting subsystem. These initializing procedures include engine operation control calculations as well as system preset steps. During this time, prescribed interrupts which would otherwise be delivered to the data processing unit from the input/output unit are inhibited. However, once the engine has been started, the interrupt inhibit is removed and the system operates under normal conditions.

Abstract: In an electronic engine control apparatus in which ignition timing and fuel injection quantity are calculated from the negative pressure in an intake manifold of the engine or from a flow rate of suction air and the rotational speed of the engine, a reference register group is constituted of register for storing the result of the calculation while an instantaneous register group is made up of registers for storing the instantaneous states of actuators. One of the registers of the instantaneous register group is selected according to a stage timing signal, so that the contents of the two registers selected are compared with each other for producing control pulses for driving actuators such as an ignition coil or fuel injector.

Abstract: A signal corresponding to the oxygen concentration in exhaust gas as detected by an O.sub.2 sensor is applied to a control logic circuit after analog conversion. The duty ratio of a pulse signal for keeping the optimum air-fuel ratio corresponding to a running state of an automobile is calculated by the use of the detection signal and in accordance with a program stored in a ROM in advance. The control pulse having the duty ratio is used for the switching control of a solenoid valve for regulating the air-fuel ratio of a mixture.

Abstract: A transistorized ignition apparatus for driving plural ignition coils of an internal combustion engine comprising two power transistor circuits, each having a power transistor, and a pick-up coil for generating an ignition timing signal synchronized with the rotation of the engine. A wave-form shaping circuit receives the ignition timing signal and determines the conduction period of the power transistors, including the conduction starting point thereof. Two driver circuits, which are provided for respective power transistor circuits, produce driving signals thereto on the receipt of an output from the wave-form shaping circuit. Each power transistor circuit has a current limiter circuit which decreases the base current of the power transistor depending on the amount of the current flowing therethrough. The currents through the power transistors, therefore, are restricted to respective maximum values and the operations thereof are drawn into the non-saturation region.

Abstract: A power transistor is connected in series with a DC power supply and the primary winding of an ignition coil. The base of the power transistor is connected to first and second transistors connected in compound fashion. A current limiter circuit is operated when the current in the primary winding reaches a predetermined value, thus controlling the first transistor. The second transistor is controlled by and the current thereof limited by the first transistor on the one hand and on the other hand subjects the power transistor to on-off control in accordance with the ignition timing signal synchronous with the engine r.p.m.

Abstract: A control system for the internal combustion engine comprises means for detecting the flow rate of air sucked into the engine, as an electrical signal, means for detecting the number of revolutions of the engine, a sensor for sensing the oxygen concentration in the engine exhaust gas, a fuel injector for injecting fuel into the path of air sucked into the engine, in synchronism with the rotational angle of the engine at the required injection timing, and control means for controlling the fuel injection timing of the injector on the basis of the air flow rate signal from the air flow rate detector means, the number-of-revolutions signal from the number-of-revolutions detector means and the air-fuel ratio signal from the oxygen sensor.

Abstract: An electronic spark timing advancing apparatus for an internal combustion engine having an ignition device is disclosed, wherein a crank angle at which an internal pressure of a cylinder of the engine assumes a peak value is detected and a desired crank angle at which the internal pressure of the cylinder is to assume a peak value under a given condition is calculated in accordance with that condition, and a spark timing of the ignition device is controlled in response to a deviation therebetween to minimize the deviation.

Abstract: A detecting means for detecting an alternating signal produced by a pickup coil in timed relationship with engine rotation is provided by a circuit including in combination a P-N-P transistor and an N-P-N transistor. The temperature effects of these transistors, each of which has a characteristic which shifts with respect to the operating level thereof, compensate each other and the current through the ignition coil is thereby controlled in response to the output of the detecting means independent of the effects of temperature.

Abstract: An ignition apparatus wherein an AC current signal is produced from the coil of a pick-up in accordance with the engine revolutions and the primary-side current of the ignition coils is regulated in accordance with the output signal from the pick-up coil thereby to generate a high voltage at the secondary side of the ignition coils. Further, a monostable multivibrator and means for generating a voltage corresponding to the output frequency of the pick-up coil are provided in order to maintain the duration of energization of the primary side of the ignition coils substantially constant over a wide range of variations of engine revolutions from low to high levels.

Abstract: In an ignition system wherein an ignition timing signal generated in synchronism with the engine rotation is detected by a detecting transistor and a base current of a power transistor adapted to control a primary current of an ignition coil is controlled by the detected ignition timing signal thereby to generate a high voltage across a secondary side of the ignition coil; the primary current of the ignition coil is controlled by the power transistor not to exceed a predetermined value, a time interval during which the primary current of the ignition coil is restricted to the predetermined value is detected by a change in collector voltage of the power transistor, i.e. an output thereof, and a conduction starting point for the primary current of ignition coil is controlled by the output of the power transistor.

Abstract: An electronic ignition timing control system for controlling the advance angle of ignition timing of an internal combustion engine, in which an electrical signal for controlling the advance angle is applied to an ignition timing control circuit separately from a trigger pulse signal used to set the ignition timing so as to obtain an advance angle controlled output from the ignition timing control circuit.

Abstract: An ignition system for internal combustion engines, in which a spark is produced across a spark plug gap when a capacitor is discharged through a primary winding of an ignition coil.As a switching means for energizing and deenergizing the primary winding of the ignition coil a transistor is used, and also a time constant circuit for controlling the transistor is provided. At the time of producing a spark by rendering the transistor conductive, electromagnetic energy is stored in the primary winding of the ignition coil. When the transistor is subsequently cut off by the action of the afore-mentioned time constant circuit, a second spark is produced with the electromagnetic energy stored in the primary winding.

Abstract: A fuel injection apparatus has two magnetic coils, a valve-opening magnetic coil and a valve-closing magnetic coil. During the valve opening operation the magnetic force caused by the valve opening magnetic coil moves the movable armature toward the opening position for discharging the fuel into the engine and during the valve closing operation the magnetic force caused by the valve-closing magnetic coil moves the movable armature to the closing position for stopping the fuel injection, so that the response time of the fuel injection apparatus is shortened.

Abstract: A feedback circuit for feeding back the output voltage of a comparing amplifier to the input circuit of the comparing amplifier for causing a steep change in the output voltage so as to stabilize the operation of the succeeding circuit. The feedback circuit includes means for applying the feedback voltage to a low potential portion of the input circuit of the comparing amplifier.