Abstract: A control unit outputs a data through an execution of each frequency of an engine driving operation condition such as an operation amount of an accelerator pedal, an engine speed, and a gear position. Frequency distribution of the engine driving condition is made through an addition processing and a subtraction processing in an area division. The present target throttle opening degree is determined through an area division judgment in the control unit. An actual throttle opening degree is adjusted so as to become a target throttle opening degree. The target throttle opening degree is searched through a map for searching the target throttle opening degree. The obtained engine control conditions are stored and memorized successively in the control unit, and an engine control characteristic is selected in sequence according to the memorized results. An operation characteristic corresponding to the driver's driving operation is selected and an optimum operability performance is obtained.

Abstract: In an engine control apparatus for controlling the amount of fuel to be supplied by calculating the amount of liquid film or fuel adhered to an intake pipe of an engine, the adhesion rate of fuel and the time constant of evaporation of fuel in a preestimating manner, the time constant of evaporation is determined on the basis of the determined amount of liquid film, the amount of suction air and an air-to-fuel ratio upon fuel cut and the adhesion rate is determined on the basis of the amount of supply of fuel, the amount of suction air and an air-to-fuel ratio upon fuel recovery.

Abstract: An internal combustion engine control apparatus in which upon detection of transient state of the engine such as acceleration, deceleration or the like, the amount of fuel supply to the engine is corrected by using transient correcting coefficients which are determined previously and updated through learning procedure. The correcting coefficient is updated on the basis of the result of comparison of the air-fuel ratio detected upon occurrance of the transient state with a predetermined reference value.

Abstract: A fuel adhesion percentage of an injected fuel to a surrounding portion of an intake valve is determined in accordance with a fluctuation value of an air-fuel ratio correction coefficient and a fluctuation value of a signal of an air-fuel ratio detecting sensor or a signal of an oxygen amount detecting sensor. Each adhesion percentage of the injected fuel is divided and stored in each division area of a characteristic memory map of a control unit. The adhesion percentage of the injected fuel is stored in a memory of the control unit and is determined in accordance with present throttle valve opening degree and present engine coolant temperature by the characteristic memory map. The adhesion percentage of the injected fuel is obtained through a learning control process in the control unit. An air-fuel ratio correction in a transient period is carried out smoothly.

Abstract: A novel method of controlling air-fuel ratio for an internal combustion engine is disclosed, which comprises a memory area for holding regional compensation factors used for air-fuel ratio control, a memory area for holding new regional compensation factors obtained by learning, and a memory area for holding regional compensation factors based on the result of the learning immediately before the latest learning, thus rationalizing the new setting and updating proceses of regional compensation factors according to the result of learning.

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: A novel method of controlling air-fuel ratio for an internal combustion engine is disclosed, which comprises a memory area for holding regional compensation factors used for air-fuel ratio control, a memory area for holding new regional compensation factors obtained by learning, and a memory area for holding regional compensation factors based on the result of the learning immediately before the latest learning, thus rationalizing the new setting and updating processes of regional compensation factors according to the result of learning.

Abstract: A method of controlling fuel injection to an internal combustion engine by electronic circuits. A plurality of cylinders installed in the internal combustion engine are divided into two groups and two electronic circuits for controlling the respective two cylinder groups are provided. By comparing between the outputs of the two electronic circuits, whether the operations of the respective electronic circuits are normal or not is judged. The fuel injection controlled by the electronic circuit which has been judged to be abnormal is stopped, while the fuel injection controlled by the electronic circuit which has been judged to be normal is continued. Thus, the internal combustion engine is driven solely by one group of cylinders.

Abstract: An ignition timing control apparatus for an internal combustion engine having a plurality of cylinders. The apparatus includes a knock sensor for detecting a knocking condition in the engine, sensors for detecting other operating conditions of the engine, a microprocessor unit for receiving signals from the sensors to determine a basic ignition timing of the engine and generate an ignition timing control signal, and a power transistor circuit responsive to the ignition timing control signal from the microprocessor unit to switch on and off the primary current in an ignition coil and generate a high-voltage ignition signal.

Abstract: A control apparatus for an internal combustion engine is arranged such that, for each of the operating condition sections (A, B, C) of an internal combustion engine (1), a deviation (K.sub.l) of a feedback control value in the section from a reference value is detected and written in a region in a memory corresponding to the section in the form of a map, and the deviation (K.sub.l) is read out such as to be used as a correction value when control is effected in relation to the corresponding operating condition section. In such control apparatus, whether or not the number of regions in the memory into which deviation values for operating condition sections (T.sub.p, N) have already been written has reached a predetermined value is examined.

Abstract: In a method of controlling a 4-stroke cycle internal combustion engine for automobile, when only a positional signal, which is generated each time the crank shaft of engine is rotated once, is first generated after the start of engine, only the fuel injection control is immediately made. When both the positional signal and a reference cylinder signal which is generated each time the crank shaft is rotated twice are generated after the start of engine, the fuel injection control and ignition control are made.

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: A device for electrically connecting a spark plug to a high-voltage cable supplying a high voltage to the spark plug from an ignition coil, comprising a connecting member whose maximum length in the axial direction of the spark plug is selected to be not longer than 25 mm so as to reduce the antenna effect in the area including the connecting member thereby minimizing undesirable radiation of noise which provides radio interference against other electronic units.