Abstract: A fuel injection control system is designed to be commonly available to an engine with a manual transmission and an engine with an automatic transmission. The internal combustion engine has a fuel injection device for delivering different amounts of fuel to the engine according to engine operating conditions. The fuel injection control system causes the fuel injection device to make an increase in fuel amount when the engine operates in a specific zone of engine operating conditions defined by engine operating speeds and loads. When the engine operating condition remains in the specific zone, the control system makes the increase in fuel amount with a time delay from a time the engine operating condition changes into the specific zone.

Abstract: A method for learning control and precontrol for adjusting the lambda value for the air/fuel mixture to be metered to an internal combustion engine 11 compares a large comparison value with a small comparison value with the large comparison value being formed by averaging of adaptation factors for large precontrol values and the small comparison value being formed by averaging of adaptation factors for small precontrol values. Whenever the large comparison value is smaller than the small comparison value, a global summand is incremented by a correction value, otherwise it is decremented. An apparatus operating according to this method has the advantage that disturbing influences which act additively on the injection time are compensated with great accuracy.

Abstract: An air-fuel ratio controller, including: fuel injection apparatus to supply an engine with fuel, a quantity of fuel to be delivered by the fuel injection apparatus being controlled by an impressed fuel quantity injection pulse having an injection time width corresponding to a desired fuel quantity; engine status detecting apparatus for detecting a status of at least one of a rotation frequency, intake manifold pressure, and volumetric efficiency operating parameter with respect to an operation of the engine; basic fuel quantity calculating apparatus for calculating a basic fuel quantity according to the status detected by the engine status detecting apparatus; air-fuel ratio sensor apparatus for detecting an air-fuel ratio in an exhaust gas from the engine; proportional integral processing apparatus for integrally processing and calculating an actual fuel quantity according to the output from the air-fuel ratio sensor apparatus; learning apparatus for calculating, using an output from the integral processing

Abstract: An adaptation value memory is used for a learning control method having precontrol for an internal combustion engine and a corresponding apparatus. The adaptation value memory has a predetermined number of support points which are addressable via data records of values of address operating values. A learning operation is initiated if a support point region is left during operation of the internal combustion engine and if steady state operation was present therebefore. The adaptation value of the above-mentioned support point is changed by the learning operation when a control means issues an actuating variable which deviates from a desired actuating variable. The actuating variable deviation is not applied in full strength, instead, it is applied attenuated to change the old adaptation value. This is performed by means of an attenuation means which, as main function groups, has a learning intensity table 26, a counter read memory 27 and a counter difference table 28.

Abstract: A slip value of a driving wheel is calculated on the basis of driving and driven wheel velocities detected by wheel velocity sensors. A target engine output of a vehicle is set in accordance with the slip value of the driving wheel. A target fuel amount to the engine is set in accordance with the target engine output. A target opening of a throttle valve is set based on the target fuel amount. An opening correction value of the throttle valve is calculated in accordance with a deviation between the target fuel amount and an actual fuel amount to the engine detected by a fuel controller. A traction controller controls to cause the engine output to coincide with the target engine output by ontrolling the opening of the throttle valve to attain an opening as a sum of the target opening and the opening correction value.

Abstract: A fuel control apparatus for an internal-combustion engine, capable of accurately determining fuel injection quantity according to exhaust gas recirculation rate regardless of bypass air flow rate and the atmospheric pressure.

Abstract: An engine control device is provided for reducing the retrieving time of control data from sensors at high and low engine speeds. Control parameters from the sensors are converted into memory access parameters to a control map to recover the desired injection amount. The fuel injection quantity is calculated by retrieving fuel injection amounts using the memory access parameters as addresses and performing a four-point interpolation of the memory parameters. A previously retrieved value is used as a reference value to aid the determination of an updated memory access parameter so that the retrieving time can be reduced for high and low engine speeds.

Abstract: There is disclosed an air-fuel ratio control system for an automotive engine having a fuel injection system including injectors, an intake air quantity measuring system including an intake air quantity sensor, and a canister purge control system corresponding to a necessity. The air-fuel ratio control system comprises a learning designation circuit for selecting a learning region for the measuring system or the injection system, a measuring system learning circuit for learning a correction amount of the measuring system responsive to the selection of the designation circuit, an injection system learning circuit for learning a correction amount of the injection system responsive to the selection, and a fuel quantity setting circuit for setting the quantity in dependency on an engine speed and an intake air quantity and for setting an actual fuel injection quantity by correcting the basic fuel injection quantity with the both correction amount.

Abstract: An air-fuel ratio control system for a two-cycle engine is disclosed, which includes a cylinder, a crank case serving also as a pressure chamber, a fuel injection unit including an injector and a pump, an engine speed detecting element for detecting the engine speed, and a throttle opening degree detecting element for detecting the opening degree of a throttle valve.

Abstract: A two-cycle engine has a scavenge pump provided in an intake passage, and a fuel injector provided for injecting fuel directly in a cylinder of the engine. A scavenge pressure sensor is provided in the intake passage for detecting a scavenge pressure. A plurality of data relative to quantity of air induced in the cylinder excluding escape air at scavenging the cylinder are stored in a memory. Quantity of air is derived from the memory in accordance with the detected scavenge pressure. Quantity of fuel injected by the fuel injector is calculated based on the derived quantity of air induced in the cylinder.

Abstract: An apparatus for use in an internal combustion engine operable on either of gasoline fuel and gasoline-alcohol fuel blend. The apparatus includes an alcohol concentration sensor for sensing the alcohol concentration of the fuel to be delivered to the engine, and an oxygen sensor sensitive to the oxygen content in exhaust gases discharged from the engine for producing an air/fuel ratio feedback signal. A difference of the air/fuel ratio from the stoichiometric value is calculated based on the air/fuel ratio feedback signal for a closed loop air/fuel ratio control. A correction factor is used to correct the amount of fuel delivered to the engine so as to provide fuel enrichment during high engine load conditions. In the event of failure of the alcohol concentration sensor, the amount of fuel delivered to the engine is determined with the alcohol concentration being set at a predetermined value.

Abstract: In order to obviate the delay between a demand for transitory engine operation and the injection of the appropriate amount of fuel, an initial correction pulse width is generated in response to the change in throttle valve position is added to a basic width which is developed based on the output of an air flow meter located in an upstream section of the induction conduit. The system further provides for continuously updating correction factors which are applied to the throttle sensor to ensure linearity and generating weighting factors and the like which are appropriately applied to improve the air-fuel control.

Abstract: A system and method for controlling fuel combustion for an internal combustion engine in which one of a plurality of maps representing basic control values derived according to the engine operating condition which corresponds to fuel having a high octane number is first and always selected and used for combustion control at an initial state of the engine whenever the engine is started. When the engine is transferred into a predetermined area of the engine operating condition during the use of the map, the ignition timing angle is retarded by a retardation amount upon detection of occurrence of engine knocking and the map is switched to another map which corresponds to fuel having a low octane number. A control value (e.g., ignition timing angle value) is set which controls the combustion state and a parameter associated with the engine combustion state is operated to control the combustion state on the basis of the control value.

Abstract: A fuel control for an engine using a liquid fuel mixture of two fuels such as gasoline and alcohol has a fuel composition sensor and stores a fuel composition value derived from the sensor near the end of one period of engine operation. That value is used in place of the actual fuel composition sensor output for a predetermined time at the start of the next period of engine operation. The predetermined time is at least long enough for the fuel movement caused by the fuel pump to remix separated fuel in the vicinity of the fuel composition sensor and may conveniently be the period of time from the initiation of fuel pump activity until the time that fuel from the tank would be expected to at least reach the sensor.

Abstract: A known control system for adjusting the lambda value of an internal combustion engine includes a corrective value ROM for transient operation wherein corrective values are stored for correcting the injection times for transient operation. In contrast thereto, the system according to the invention includes a corrective base value ROM 30, an adaptation value RAM 35 and an adaptation unit 34. The values from the corrective base value ROM are not utilized directly for correcting injection times; instead, these values serve as corrective base values which only become adapted corrective values by means of multiplication with adaptation values. The adaptation unit adapts the adaptation values in the adaptation value RAM. For this purpose, the adaptation unit determines the lambda value control deviations during a transient operation.

Abstract: The quantity of air inducted in a cylinder of an engine is estimated by using equations based on various coefficients. The coefficients are stored in a memory and derived in accordance with engine operating conditions. A basic injection pulse width is calculated by the estimated inducted air quantity and speed of the engine. The basic injection pulse width is corrected by a feedback coefficient, thereby producing a fuel injection pulse width signal for operating a fuel injector of the engine.

Abstract: An air-fuel ratio control system for controlling the air-fuel ratio of air-fuel mixture to be inducted into an automotive engine in order to accomplish feedback control of the air-fuel ratio into a stoichiometric level of feedforward control of the air-fuel ratio into a lean level. The air-fuel ratio control system is comprised of a control unit which is electrically connected to an oxygen sensor for detecting the air-fuel ratio and to a variety of sensors for detecting engine operating condition. The control unit is adapted to calculate an air-fuel ratio correction coefficient in accordance with the detected air-fuel ratio. The feedback control of the air-fuel ratio is accomplished in accordance with the air-fuel ratio correction coefficient. The control unit is further adapted to form a plurality of learning areas defined respectively by engine operating conditions. Learning is made in each learning area. At least a part of each learning area is under the feedback control.

Abstract: An electronic control system for an internal combustion engine, in which parameters necessary for the engine control are found by use of auxiliary quantities to thereby control the operating characteristic quantities of the internal combustion engine, the electronic control system comprising: a memory device for storing in advance, in the form of a two-dimensional map, a charging efficiency per se or related values of the charging efficiency corresponding to a degree of opening of the throttle valve and a number of engine revolution under the reference atmospheric condition; and a computing device for computing atmospheric pressure related values which include therein at least the atmospheric pressure value and are dependent on the atmospheric pressure, in accordance with a predetermined computation equation which takes a ratio of the charging efficiency per se or related values of the charging efficiency to be found out by selective use of signals of the intake air flow rate and a number of revolution of the

Abstract: A fuel supply control apparatus for an internal combustion engine according to the present invention relates to an apparatus, in which the air intake quantity for the internal combustion engine is detected by an air flow sensor and a quantity of a fuel to be supplied to the internal combustion engine is controlled on the basis of an output from said air flow sensor, provided with the air flow sensor and a crank angle sensor for detecting a crank angle of the internal combustion engine and capable of reasonably controlling an air fuel ratio of the internal combustion engine even in the case, where a throttle valve is almost completely opened, by detecting the air intake quantity in a range of a predetermined crank angle interval, determining a resulting value which is proportional to the air intake quantity per one intake stroke of the internal combustion engine, on the basis of the detected value, limiting the resulting value by a predetermined value corrected by parameters of the internal combustion engine,

Abstract: Average pressure of pressure in an intake passage is calculated. A basic injection quantity is determined by engine speed and the average pressure. On the other hand, estimated pressure is estimated from engine speed and throttle position. A correcting coefficient is obtained from the average pressure and the estimated pressure, and the basic injection quantity is corrected with the correcting coefficient.

Abstract: In a method and an apparatus for open-loop and closed-loop control of operating characteristic quantities of an internal combustion engine, it is proposed that the anticipatory or pilot control area, which is variable by means of learning, be embodied such that in a factor characteristic field associated with a basic characteristic field, not only the particular support point but with decreasing influence outward the area surrounding it as well are changed by the carry-over of an averaged regulating factor value. Alternatively, or preferably combined therewith, the factor characteristic field is replaced by at least two correcting characteristic fields, which have larger inclusion areas, overlapping one another, for each support point, so that even in the event of fluctuations of input quantities about a border of an area, at least one of the correcting characteristic fields will be addressed.

Abstract: A system for controlling fuel injection has an engine speed sensor, a throttle position sensor and an atmospheric pressure sensor. A first basic injection pulse width is calculated based on detected engine speed, throttle position, and atmospheric pressure. A memory storing correcting coefficients dependent on engine speed is provided, and a correcting coefficient is derived from the memory in accordance with the engine speed. The first basic injection pulse width is corrected with the derived correcting coefficient to provide a fuel injection pulse width signal for operating a fuel injector.

Abstract: An electronic control device in an internal combustion engine with an EGR apparatus for calculating a predetermined control variable such as a fuel injection time period or an ignition timing, and correcting same to exclude a component stemming from EGR gas in the intake air. The device comprises a first unit for calculating a fundamental value of the fuel injection time period (TP), a second unit for converting the detected intake pressure under the detected atmospheric pressure into a converted intake pressure under the standard atmospheric pressure in response to the detected atmospheric pressure and a third unit for calculating a correcting value (TPE) from data including information regarding the EGR gas under the standard atmospheric pressure and stored as a function of the converted intake pressure (PMT). In this device, the fundamental value can be corrected by subtracting the correcting value from the fundamental value in the case of the fuel injection time period.

Abstract: An electronically-controlled fuel injection system for an internal combustion engine including means including a computer for electronically controlling a fuel injection quantity of an engine, means for detecting a rotational speed of the engine and a throttle sensor having lower and higher opening regions for detecting an opening of a throttle valve is further provided with means for storing the ratio between the slopes of output voltage characteristic curves derived from the regions with respect to a throttle opening in a range where the ranges of throttle openings to be detected in the regions overlap, and means for correcting the output voltage generated from one of the regions by use of the ratio in a throttle opening range exceeding said overlapping range.

Abstract: A fuel injection control system coupled to a multiport fuel injected engine for adjusting the air/fuel mixture of each combustion chamber to a preselected level. A plurality of fuel command controllers provides a separate fuel command signal to each fuel injector in response to a single base fuel command. During each correction interval of a correction time period, each of the fuel command signals is perturbed or offset in a predetermined sequence by a predetermined amount. A measurement of the average of air/fuel ratios among the combustion chambers is taken each correction interval. Airflow inducted into the combustion chambers is also measured. In response to these measurements, and the known fuel offsets, the actual fuel delivered by each fuel injector is calculated. All the fuel command controllers are corrected in response to associated fuel calculations to balance the air/fuel ratios of each combustion chamber.

Abstract: A fault diagnosis system for automotive electronic devices which are adapted to transmit their diagnosis data at different data transmission speeds peculiar thereto. The system has a memory device for storing transmission data concerning speeds of data transmission optimum for the respective electronic devices. The memory device also is capable of storing diagnosis data concerning the respective electronic devices. The diagnosis system also has a tester for reading, when connected selectively to one of the electronic devices, the data concerning the data transmission speed optimum for the selected electronic device from the memory device. The tester then forms a transmission reference clock reference signal on the basis of the read data. The tester is further adapted for exchanging data with the selected electronic device in accordance with the transmission reference clock signal and other stored data.

Abstract: The invention refers to a device for adapting the fuel/air metering system and the ignition system of an internal combustion engine to enable the engine to be operated with all normally available grades of petrol (gasoline). The invention provides for a manual facility for switching-over the fuel/air metering system from a fuel/air map for .lambda.=1 (operation with three-way catalytic converter and .lambda. sensor) with unleaded fuel to a fuel/air map for .lambda..noteq.1. Additionally, a manual facility is provided for switching over or selecting two out of a total of four ignition timing maps for premium grade unleaded fuel (s.sub.u), regular grade unleaded (n.sub.u), premium grade leaded (s.sub.b) and regular grade leaded (n.sub.b) (switch contacts 4, 10 11). An automatic switch-over function between the ignition timing maps s.sub.u /n.sub.u and s.sub.b /n.sub.

Abstract: A learning control system has a table storing learning coefficients in divisions thereof. An abnormality detecting system has a section for determining a number of updating times of coefficients in the table, and for determining a fact that a number of divisions in which each coefficient is out of a predetermined limit range is larger value than a predetermined second number. The section produces an abnormality signal when a coefficent exceeding the limit range in a particular division is updated a number of times more than a predetermined number of times. In accordance with the abnormality signal, all of coefficients in the table are held to a standard value.

Abstract: A fuel feed quantity control system of the so-called L-Jetronic system is described. The system is equipped with a Karman vortex air-flow sensor, at least one injector for feeding a fuel into an internal combustion engine, a controller for controlling the quantity of the fuel, which is to be injected, on the basis of intake air flow rate information from the air-flow sensor, and at least one operation parameter sensor. The controller also includes at least one additional control unit which serves to correct the quantity of the fuel, which is to be fed into the engine, in accordance with at least one operation parameter from the operation parameter sensor and frequency information outputted from the air-flow sensor. The quantity of the fuel, which has been determined based on an output from the air-flow sensor, is corrected by the controller in accordance with changes in kinematic viscosity of the atmospheric air.

Abstract: A method of controlling an operation of an internal combustion engine. A memory has stored therein a plurality of basic values of a control amount by which the operation of the engine is to be controlled, and which conform to at least one operating parameter of the engine, as well as at least one correction value for correcting the basic values. When each of first and second conditions is detected under which the operation of the engine is required to be controlled by respective different amounts, ones of the basic values are read from the memory, which corresponds to the value of the at least one operating parameter. When a predetermined one of the first and second conditions is detected, the at least one correction value is read from the memory, by which the read basic values are corrected by the read correction value. The operation of the engine is controlled by control amounts based upon the corrected basic values.

Abstract: The invention relates to a method and apparatus for controlling operating characteristic quantities of an internal combustion engine. For issuing an uncorrected anticipatory control value, a characteristic field is addressed by directing pregiven operating characteristic quantities as addresses and, with a simultaneously superposed control, an averaged value of the control factor is applied to the anticipatory control region for effecting an adaptive learning procedure. From the averaged control factor, a global factor is defined which works multiplicatively on the entire basic characteristic field. This considers especially multiplicative disturbance influences.

Abstract: Steady state of engine operating conditions is determined by two variables of engine operation. A two-dimensional table having addresses dependent on one of the two variables is provided. Data stored in the two-dimensional table is updated with a new data obtained at the determined steady state at a corresponding address.

Abstract: In a two stroke fuel injection type internal combustion engine provided with intake and exhaust valves, a basic amount of fuel to be injected is calculated in accordance with an engine load and engine speed. Values of a factor corresponding to a ratio of air captured by an engine cylinder for combustion to the total amount of air introduced into the engine are stored in a memory in accordance with combinations of an engine load and engine speed. A value of a captured air factor corresponding to a detected combination of an engine load and speed is calculated by a map interpolation. The basic amount is corrected by the captured air factor so that a desired air-fuel ratio is obtained. The captured air factor may be further corrected in accordance with a secondary engine condition, other than an engine load and speed, such as a cooling water temperature, intake air temperature, atmospheric air temperature, atmospheric air pressure, exhaust gas temperature, or intake pressure.

Abstract: A fuel is injected based on the rpm of the engine and the suction air rate. The fuel injection amount is corrected depending on a map of fuel injection share correction coefficient prepared in advance and determined by data such as a throttle valve opening and the rpm of the engine so that amounts of fuel injected will be even at the respective cylinders. The fuel injection share correction coefficient is for correcting fuel deviation due to construction of suction passage to with the respective cylinders or for correcting fuel deviation due to arrangement of two injectors in one bore with respect to the throttle valve shaft.

Abstract: The invention is directed to an engine control system wherein fuel injection and ignition is dependent upon elevation. In this system, the elevation is detected via the maximum charge signal in the full-load operation of the engine. For this purpose, characteristic curves for the maximum fuel quantity corresponding to various elevation values are stored. A limitation of the maximum charging signal is carried out in the specific speed range in dependence upon the detection elevation in order to prevent overenriching by means of pulsations. Furthermore, a correction ignition angle adapted to the particular elevation and a corrosion factor for the injection time are effective which makes possible a full-load adaption of the motor at the elevation.

Abstract: A fuel injection system and method for injecting fuel into a chamber in an air intake manifold which is connected to plurality of engine cylinders by a plurality of branch passages. The fuel injection system controls separately an amount of fuel injected from an injector to each engine cylinder with configurations of the respective branch passages taken into account. That is to say, in the fuel injection system, at least one fuel injector is disposed so as to inject fuel into the chamber, timing of suction stroke of each engine cylinder is determined, and the amount of fuel supplied to each cylinder is set on the basis of the dimensions of the branch passage from the position of the fuel injector to a corresponding cylinder, and the amount of fuel injected through the fuel injector for each cylinder is calculated on the basis of the amount of fuel to be actually distributed to each cylinder.

Abstract: Two matrixes, each of which is formed by two variables of engine operation such as engine load and engine speed, is provided in staggered relation on the X axis by a predetermined value. Two tables are provided, each having addresses corresponding to the X axis of the matrix. Data stored in the two tables is updated when a single position in at least one of the matrixes remains the same for a predetermined time. Data in the two tables are read out and available data is calculated from the two data.

Abstract: A fuel supply control system for an internal combustion engine which is capable of precisely controlling the amount of fuel to be supplied to an engine so as to provide a predetermined air/fuel ratio irrespective of the provision of an EGR system or the amount of EGR in the case of EGR control. Fuel is supplied to an engine by fuel injection valves, and a part of exhaust gas discharged from the engine is adjustably recirculated to a location downstream of a throttle valve in an intake pipe. In a memory that is stored data detemining the amounts of fuel to be supplied to the engine in the absence of the exhaust gas recirculation corresponding to the respective engine operating conditions which are determined by the manifold pressure of the intake gases at the downstream side of the throttle valve detected by a pressure detector and the engine RPM detected by an engine RPM detector, and which are classified in a two dimensional manner.

Abstract: A method of effecting feedback control of the air-fuel ratio of an air-fuel mixture supplied to an internal combustion engine to a first predetermined value, by correcting a basic fuel supply quantity by the use of a correction coefficient variable in response to the output of an exhaust gas ingredient concentration sensor, when the engine is operating in a predetermined feedback control region. A predetermined engine low-load operating region outside the predetermined feedcback control region is defined by at least one parameter representing load on the engine. When the engine enters the predetermined low-load operating region, the correction coefficient is gradually decreased until the air-fuel ratio of the air-fuel mixture is increased to a second predetermined value leaner than the first predetermined value.

Abstract: The air/fuel ratio of an engine during its open loop fuel controlled warm up period is established by one schedule while the vehicle automatic transmission is in drive and established by another schedule while the vehicle automatic transmission is in neutral.

Abstract: A first lookup table is provided for storing a plurality of basic fuel injection pulse widths from which one of pulse widths is derived in accordance with engine speed and intake-air pressure. A second lookup table is provided for storing a plurality of maximum correcting quantities for correcting a derived basic fuel injection pulse width in order to correct deviation of air-fuel ratio due to change of valve clearance of the engine. A necessary correcting quantity is obtained by multiplying a learning coefficient and a derived maximum correcting quantity. A desired fuel injection pulse width is obtained by adding the necessary correcting quantity to the derived basic fuel injection pulse width. The learning coefficient is determined so as to reduce the deviation of air-fuel ratio to an allowable value at a first updating only.

Abstract: A first lookup table is provided for storing a plurality of basic fuel injection pulse widths from which one of pulse widths is derived in accordance with engine speed and intake-air pressure. A second lookup table is provided for storing a plurality of maximum correcting quantities for correcting a derived basic fuel injection pulse width in order to correct deviation of air-fuel ratio due to change of valve clearance of the engine. A necessary correcting quantity is obtained by multiplying a learning coefficient and a derived maximum correcting quantity. A desired fuel injection pulse width is obtained by adding the necessary correcting quantity to the derived basic fuel injection pulse width.

Abstract: Steady state of engine operating conditions is determined by two variables of engine operation. A table is provided comprising a two-dimensional table having addresses dependent on one of the two variables and a three-dimensional table having addresses dependent on the two variables is provided. Data stored in the two-dimensional and three-dimensional tables are updated with new data obtained at the determined steady state at a corresponding address.

Abstract: An air/fuel ratio control system is constructed to calculate a base value of an air/fuel ratio control in response to a plurality of engine operational parameters. The base value is adjusted by an output signal of an exhaust gas component concentration sensor, to provide an output value which is directly used for the air/fuel ratio control. Under a predetermined operational condition of the engine, the adjustment of the base value on the basis of the output signal of the exhaust gas component concentration sensor is stopped and the base value is corrected by a correction value, which is one of a number of values stored correspondingly as engine operational parameters, and read out using present values of the engine operational parameters.

Abstract: An air-fuel ratio feedback control system is provided with a look-up table storing a plurality of time data dependent on an engine operating condition. The time is decided to correspond to a control delay time of the control system. When a desired air-fuel ratio varies, feedback operation is stopped for a time derived from the look-up table.

Abstract: A method of controlling fuel supply to an internal combustion engine, wherein a quantity of fuel for supply to the engine is determined by correcting a basic value of the quantity of fuel determined as a function of at least one operating parameter of the engine by correction values dependent upon operating conditions of the engine, and the determined quantity of fuel is supplied to the engine. A value of at least one predetermined operating parameter of the engine is detected. A single voltage creating means is adjusted to set an output voltage therefrom to a desired value. Predetermined one of the correction values has a value thereof set as a function of the output voltage from the voltage creating means and dependent upon the value of the at least one predetermined operating parameter of the engine.

Abstract: A fuel injection control system for an internal combustion engine in which the amount of fuel injected per input stroke of the engine is precisely controlled so that a predetermined constant air-to-fuel ratio is maintained at all times. A fuel flow arithmetic unit, operating from inputs supplied from a sensor which detects the pressure in the intake manifold of the engine, calculates a fuel flow amount per intake stroke. The output of the fuel flow arithmetic unit is applied as an address input to a memory in which are prestored values of driving times for each value supplied from the fuel flow arithmetic unit. The driving times are calculated taking into account the non-zero opening and closing times of the fuel injection valves, thereby eliminating nonlinearities in the fuel flow amount driving time characteristics. A driving signal generating circuit drives (opens) the fuel injection valves for times indicated by the driving times outputted by the memory.

Abstract: A fuel supply control method for an internal combustion engine in a cold state. A basic value of fuel supply quantity is corrected to an increased value by the use of a correction variable set based upon engine temperature and engine load. Intake air temperature is detected, and the correction variable is corrected by the detected intake air temperature. Preferably, the correction variable is corrected to a larger value as the detected intake air temperature is lower.

Abstract: A fuel injection control system intended to correct for return blow. First, the sensed throttle valve opening is corrected according to the engine'rotation rate to provide a correction factor. Then this correction factor is combined with a sensed air-flow signal and an air temperature signal to provide a corrected air-flow amount.

Abstract: An electronic air-fuel mixture control system is adapted to an internal combustion engine to determine an optimum air-fuel ratio in dependence upon renewal of plural learning values related to a plurality of load regions of the engine. The control system is arranged to select one of the learning values in accordance with the engine load and to prohibit learning of the selected learning value when a difference between the selected learning value and the adjacent learning value is more than an allowable value determined in consideration with allowable fluctuation of the air-fuel ratio caused by change of the amount of air flowing into the engine.