Abstract: A fuel injection control system is directed a sequential injection type fuel injection internal combustion engine for injecting fuel to each engine cylinder at different timings. Acceleration enrichment asynchronous fuel injection is initiated in response to an acceleration demand. Acceleration enrichment is further performed for subsequent injection cycles to compensate for engine load indicative sensor signals which differ from actual engine load due to errors in an air flow meter.

Abstract: An apparatus for use with a multi-cylinder internal combustion engine including a plurality of fuel injectors, each being operable in its open position for injecting fuel into an intake port with which an intake valve is in cooperation for regulating the entry of combustion ingredients into the corresponding cylinder. The apparatus includes a control circuit for operating the fuel injectors in a predetermined sequence. The control circuit determines a length of time one fuel injector to be operated is in its open position in response to selected engine operating conditions. The control circuit opens the one fuel injector at a time to terminate the determined time length substantially at the same time when the corresponding intake valve opens. In addition, the control circuit prolongs the determined time length in response to a demand for engine acceleration produced when the one fuel injector is in its open position.

Abstract: A fuel injection control system is directed for a sequential injection type fuel injection internal combustion engine for injecting fuel for each engine cylinder at different timing. Acceleration enrichment asynchroneous fuel injection is initiated in response to an acceleration demand. Acceleration enrichment is further performed for subsequent given injection cycles for compensation of smaller engine load indicative sensor signal than actual engine load due to error in an air flow meter.

Abstract: Disclosed is an electronic learning control apparatus for an internal combustion engine, in which a basic control quantity corresponding to a target control value is corrected and computed by a feedback correction value to determine a control quantity and an objective parameter to be controlled is controlled by a static control quantity through control means. The entire deviation of the feedback correction value from a predetermined reference value is separated into deviations for respective error causes according to predetermined analysis rules, and a learning correction value for each error cause is computed according to the separated deviation for each error cause, and the basic control quantity is corrected based on the learing correction value for each error cause to obtain a final optimum control quantity. In this apparatus, the learning speed is increased and the learning correction precision can be improved.

Abstract: A self-diagnosis system for an auxiliary air control system of an internal combustion engine having an auxiliary air control valve provided in an auxiliary air passage bypassing a main throttle valve, comprises an air flow meter for detecting the amount of intake air, a control unit diagnosing malfunction of the air flow meter and comparing the amount of air inducted when the main throttle valve is fully closed with a value calculated according to the opening angle of the auxiliary air intake control valve. The control unit deems that the auxiliary air control system has malfunctioned only when the amount of intake air is larger than the calculated valve. In the device according to the invention, the malfunction of auxiliary air control system can be detected within a relatively short time, such as 1 sec, and the malfunction can be detected regardless of the engine speed.

Abstract: An apparatus for learning and controlling an air/fuel ratio in an engine wherein a fuel injection quantity Ti is computed by correcting a basic fuel injection quantity Tp by a feedback correction coefficient LAMBDA based on a detected air/fuel ratio. Deviation of LAMBDA from a reference value during the feedback control is learned to determine a learning correction coefficient, and on computation of Ti, Tp is corrected by a learning correction coefficient. A base air/fuel ratio obtained from Ti computed without correction by LAMBDA is made in agreement with an aimed air/fuel ratio and during the feedback control, Ti is computed by further correcting the air/fuel ratio by LAMBDA. The learning correction coefficient is divided into an altitude learning correction coefficient K.sub.ALT for learning deviation by the change of the air density with respect to all the areas of the engine driving state and an area-wise learning correction coefficient K.sub.

Abstract: An apparatus for learning and controlling an air/fuel ratio in an engine having an air/fuel feedback control function wherein a fuel injection quantity Ti is computed by correcting a basic fuel injection quanity Tp by a feedback correction coefficient LAMBDA based on a detected air/ful ratio. Deviation of LAMBDA from a reference value during feedback control is determined to further determine a learning correction coefficient. Upon computation of Ti, Tp is corrected by a learning coefficient. A base air/fuel ratio obtained from Ti computed without correction by LAMBDA is made based on a desired air/fuel ratio. During feedback control, Ti is computed by further correcting the air/fuel ratio by LAMBDA. The learning correction coefficient is divided into an indiscriminate learning correction coefficient K.sub.ALT for learning deviation by the change of the air density with respect to all the areas of the engine driving state and an area-wise learning correction coefficient K.sub.

Abstract: A spark ignition control system performs spark advance adjustment during engine acceleration according to fluctuation of engine speed for compensating the fluctuation and thus for smoothly increasing the engine speed. In order to achieve this, the spark advance is advanced during a period where the engine speed drops and is retarded during a period where the engine speed increases.

Abstract: A setting device of basic fuel injection amount for an internal combustion engine in an operating region of acceleration comparing a detected amount of intake airflow with a retrieved amount of intake airflow stored with the area of opening of a throttle valve and the engine velocity used as parameter, and when the detected amount is less than the retrieved amount, modifying the detected amount on the basis of the change ratio of opening area in the throttle valve, the engine load and the engine velocity, thereby modifying the detected amount so that it is close to the amount required by the engine.

Abstract: An electronically controlled fuel injection device for an internal combustion engine during engine acceleration determines a basic amount of injected fuel based on the amount of intake airflow detected by an airflow meter and the engine velocity until the portion filled into the intake air manifold is detected, and then a basic amount of injected fuel based on the data of intake airflow which has been recorded excluding the portion filled into the intake air manifold.

Abstract: An apparatus for learn-controlling the air-fuel ratio for an internal combustion engine is disclosed. Every time area-wise learning correction coefficients for a predetermined number of different engine running condition areas are corrected, it is judged whether or not the deviations of the present area-wise learning correction coefficients for said areas from a reference value have the same direction. If all the deviations have the same direction, a mean value of said deviations or a minimum value among the deviations in terms of the absolute value is calculated. The calculated mean or minimum value is added to a global learning correction coefficient stored in global learning correction coefficient storing means to thereby rewrite the stored data. The mean or minimum value is regarded as a deviation component due to a change in the air density which may uniformly be employed for all the areas and is substituted for the global learning correction coefficient.

Abstract: A learning and control apparatus for an electronically controlled internal combustion engine having such an object to be controlled as a fuel injection valve for controlling the air-fuel ratio in an air-fuel mixture or an idle speed control valve for controlling the idle rotation number of the engine wherein a pulse duty signal corresponding to a basic control value is set according to engine driving states. The basic control value is corrected by adding an appropriate correction value to the basic control value. Feedback control is carried out so that the actual controlled value is made to follow the aimed control value, and a learning correction quantity is computed by learning said feedback control so that the feedback control amount is set as small as possible.

Abstract: A learning and control apparatus for an electronically controlled internal combustion engine having such an object of control as the air-fuel ratio in an air-fuel mixture or the idle rotation number of the engine wherein a pulse duty signal corresponding to a basic control value is set according to engine driving states. The basic control value is corrected by adding an appropriate correction value to the basic control value. Feedback control is carried out so that the actual controlled value is made to follow the aimed control value, and a learning correction quantity is computed by learning said feedback control so that the feedback control amount is set as small as possible.

Abstract: A learning and control apparatus for an electronically controlled internal combustion engine having such an object to be controlled as, for instance a fuel injection valve for controlling the air-fuel ratio in an air-fuel mixture or an idle speed control valve for controlling the idle rotation number of the engine wherein a pulse duty signal corresponding to a basic control value is set according to engine driving states. The basic control value is corrected by adding an appropriate correction value to the basic control value. Feedback control is carried out so that the actual controlled value is made to follow the aimed control value, and a learning correction quantity is computed by learning said feedback control so that the feedback control amount is set as small as possible.

Abstract: In controlling the air-fuel ratio in an air-fuel mixture in an internal combustion engine, a pulse duty signal Tp corresponding to the basic fuel injection quantity is operated at least from the intake air flow quantity Q and the rotation speed N of the engine, a signal of a fuel injection quantity Ti corrected by adding an appropriate correction value to said Tp is applied to a pulse-controlled fuel injection apparatus. Feedback control is carried out so that the actually detected air-fuel ratio is made to follow the aimed air-fuel ratio, and the learning correction coefficient .alpha.o is operated by learning so that the correction coefficient for this feedback control is as small as possible and the operated value is given as a correction value to Tp. Since the reliability of .alpha.o is low in a driving state area where learning is not advanced, .alpha.o of the area where learning is not advanced is estimated from .alpha.

Abstract: A voltage regulator for a microprocessor unit provided with a reset circuit for the microprocessor unit. Voltage from the regulator circuit is applied to the reset circuit as well as to the microprocessor unit. The production of a reset signal during a rise time of the regulator circuit is prevented by delaying generation of a reset signal until the regulator voltage to be applied to the microprocessor level has reached an operating level. The regulator circuit and the reset circuit are commonly formed in an integrated circuit so as to eliminate the wiring therebetween and to reduce size. Further, the reset signal is produced by the reset circuit when a run signal indicative of the proper execution of program steps is not produced at a regular rate.

Abstract: The present invention relates to a learning control apparatus for controlling the air-fuel ratio in an electronic control fuel injection type internal combustion engine wherein the injection quantity (Ti=Tp.times.K.times..alpha.) is basically operated by multiplying the basic injection quantity (Tp), determined from the flow amount of sucked air and the rotation speed, by the air-fuel ratio feedback correction coefficient (.alpha.), and the feedback control of the air-fuel ratio to the aimed target air-flow ratio is performed on the thus operated injection quantity Ti. However, as it takes long time to control the air-fuel ratio to the target air-flow ratio by the feedback control of the integration if the basic air-fuel ratio at the time of .alpha.=1 deviates from the aimed at air-fuel ratio, the value .alpha. at the time in the stationary driving condition and the driving condition per se, are detected, the learning correction coefficient .alpha.

Abstract: A program run-away supervisory circuit for a microcomputer which generates a run signal each time prescribed steps are executed in a re-circulating program includes run signal discriminating frequency is above a predetermined frequency and below a preselected frequency, such that the predetermined frequency is greater than the preselected frequency.

Abstract: An electronically-controlled fuel injection system for an internal combustion engine having a supercharger, wherein fuel is injected into each power cylinder of the engine at a rate which is controlled through detection of various operational parameters including the output speed of the engine, the temperature of the engine cooling water and the pressure of the air compressed in the air induction unit of the engine by the supercharger or turbocharger.