Abstract: A device for controlling an electromechanical transducer such as a proportional electromagnetic valve, in which a pulse signal having a constant period shorter sufficiently than the minimum response time required for the displacement of the plunger of the proportional electromagnetic valve over its predetermined full stroke is applied to the electromagnetic coil of the proportional electromagnetic valve to superpose a very small vibratory stroke component on the stroke of the plunger, and the duty cycle of the pulse signal applied to the electromagnetic coil is varied so as to urge the plunger in directly proportional relation to the variation of the duty cycle without substantially giving rise to mechanical hysteresis in the stroke of the plunger.

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 of controlling, electronically, the operation of an internal combustion engine on the basis of results of arithmetic operations of digital control quantities derived from detected operating conditions of the engine through digital processing operations. The digital processing operations are divided into a number of tasks in dependence on the control functions to be performed. The method comprises a step of setting an activation request indication for a task through the execution of another task, a step of setting an activation request indication for a task through execution of the task itself, a step of searching the activation request indications for the individual tasks, and a step of executing the tasks to which the activation requests are issued on the basis of the effects of the tasks.

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 apparatus for driving a hot-wire air-flow sensor of constant temperature difference type includes a hot wire and a temperature sensitive compensating element such as a resistor for compensating temperature of air. The hot wire and the resistor are formed of identical elements. A pulse train signal having a pulse width varying in correspondence to difference between voltage drops produced, respectively, across the hot wire and the compensating resistor supplied with a constant current is produced for interrupting the current supplied to the hot wire.

Abstract: A hot-wire flow rate measuring apparatus comprises a series circuit including a first thermo-sensitive resistive element placed in the fluid path of a fluid and a first resistive element, a circuit for dividing the voltage across the first thermo-sensitive resistive element, a second thermo-sensitive resistor for temperature compensation placed in the fluid path of fluid, means for detecting the difference between the output voltage of the voltage dividing circuit and the output voltage of the second thermo-sensitive resistor for temperature compensation. Current fed to the series circuit is controlled in accordance with the detected voltage from the detecting means, and output means is provided for producing a voltage in accordance with the voltage across the resistive element, wherein the output voltage of the output means indicates a flow rate of fluid.

Abstract: In a system which detects the condition of an exhaust gas of an internal combustion engine by an exhaust gas sensor and corrects the rate of fuel supply in a feedback control mode, on the basis of the detected condition, the rate of fuel supply is corrected, in response to a particular output of the exhaust gas sensor indicating an optional air-to-fuel ratio of the fuel supply, to a rate of the past fuel supply which occurred at a dead time before detection of the particular output of the sensor, the dead time being corresponding to a time required for a fuel fed into the air inlet pipe to be burned up and then its exhaust gas to reach the sensor.

Abstract: A method and an apparatus for controlling the ignition timing for an internal combustion engine wherein whether the engine rotation is in acceleration or deceleration is detected and the magnitude of the acceleration or deceleration is detected. Each time an acceleration is detected, the ignition timing is shifted by a determined value in the same direction as that of the immediately preceding shifting, while each time a deceleration is detected, the ignition timing is shifted by a determined value in the direction reverse to that of the immediately preceding shifting, thus causing the ignition timing to approach to a situation where the engine is capable of producing its maximum torque under a given fuel supply.

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 electric ignition control system for an internal combustion engine has a first pulse generator for producing pulses at each 180.degree. interval of crank shaft revolution, a second pulse generator for delivering a predetermined number of pulses, such as 1800 counts, during each 180.degree. interval, and a read only memory for producing a digital signal representing ignition timing in response to both engine speed and throttle opening. When the first counter circuit has counted the number of the second pulse generator pulses equal to the digital value of the digital signal from the memory, the primary current of an ignition coil applied from a battery to the primary coil thereof is interrupted for producing a high voltage to establish an ignition spark across the gap of a spark plug.

Abstract: A car exhaust gas purification device controlling circuit wherein a deviation between an output of an exhaust gas sensor and a set value is converted into a time-width signal and a proportional electromagnetic valve is controlled by an integrated output of the time-width signal to control the air-fuel ratio around a theoretical air-fuel ratio, whereby an offset of air-fuel ratio due to hysteresis of such as the proportional electromagnetic valve used for controlling the air-fuel ratio is eliminated.

Abstract: A power transistor device having a circuit provided with first, second, third and fourth transistors, wherein the first and the second transistors are connected in the Darlington configuration while the third and the fourth transistors are connected respectively between the base and the emitter of the first transistor and between the base and the emitter of the second transistor, so as to release the residual charges in the first and the second transistors therethrough by being rendered conductive in response to the inputs thereto.

Abstract: The output of an oxygen concentration detector monitoring the conditions of exhaust gases from an internal-combustion engine is not a linear function of the concentration but varies widely. When feeding this output back to control the air-fuel ratio of the mixture being fed to the engine, the feed back system having the small time constant (small delay time in operation) becomes unstable due to the nonlinear output of the oxygen concentration detector. In order to stabilize the operation of the system the output of the oxygen concentration detector is input to compensating circuit which outputs the voltage being proportioned to the oxygen concentration of the exhaust gas and the output is used as the feedback signal.

Abstract: An apparatus which comprises a detector for detecting the density of one component (oxygen, for example) of exhaust gases from an internal combustion engine for regulating the ratio of air to fuel based on the detected value of the component in such a manner that the air-fuel ratio can be made approximate to the theoretical air-fuel ratio. The apparatus further comprises a first comparator having a hysteresis range and a second comparator having no hysteresis range for detecting the output of the detector for detecting the density of one component of exhaust gases, in order that variations in the characteristics of the detector or changes in its characteristics with time can be compensated for.

Abstract: An ignition apparatus for supplying ignition energy of high voltage to the ignition plugs at the optimum ignition timing required of the internal combustion engine is disclosed, in which an electric or electronic adder in a control circuit begins to be energized after a time delay sufficient at least for completion of one ignition starting from the time of generation of at least one rotational angle signal occuring prior to the optimum ignition timing, the accumulating operation continues until the generation of the next rotational angle signal when a subtractor begins subtracting operation, and the next ignition is effected by causing electromagnetic induction in the ignition coils when the result of subtraction reaches a predetermined value.