Abstract: An engine control system is provided which calculates an optimum air/fuel ratio by minimizing the smoke produced by the engine while at the same time maximizing the engine response time for all altitudes over which the engine operates. The control system includes a microprocessor, an ambient pressure sensor, fuel injectors, and storage means. A manual adjustment is provided that allows an operator to manually adjust the air/fuel ratio within certain pre-defined limits of the optimum value.

Abstract: In order to determine the fuel quantity to be fed into an internal combustion engine during each stroke of the engine, the air mass sucked into each cylinder for combustion during each intake stroke is determined based on an intake-pipe pressure. A current air mass is determined using a measured value for the intake-pipe pressure. Subsequently, during a period in which there is no change in an air intake cross-section for each cylinder, the air mass is determined using a projected intake-pipe pressure, and the fuel quantity to be fed to each cylinder during the current and subsequent intake strokes is determined based on the air mass determinations and a wall film model.

Abstract: An arrangement for controlling the drive power of a motor vehicle has at least two control units for controlling at least two changing variables for influencing the drive power. The variables are independent of each other. The arrangement further includes at least one measuring device for detecting an operating variable of the drive unit and/or of the motor vehicle. This one measuring unit includes at least two redundant sensors with the output signal of one sensor being supplied to a first control unit and the output signal of another sensor being supplied to a second control unit. Both control units monitor the measuring device on the basis of the output signals with additional monitoring measures being carried out on the basis of the monitoring results of the two control units.

Abstract: An engine control system to calculate the intake air quantity comprises engine revolution speed detecting means for producing an output signal of engine revolution data, intake air temperature detecting means for producing an output signal of intake air temperature data of the intake manifold, cylinder operation condition determining means for producing an output signal of the cylinder operating condition data for each engine cylinder, intake air pressure detecting means for producing an output signal of air pressure data of the intake manifold, intake air ratio compensation value calculating means for calculating, on the basis of the cylinder operation data of each cylinder an intake air ratio compensation value derived from the air pressure data of air in the intake manifold and the engine revolution speed data of the engine, and intake air quantity calculating means for calculating an intake air quantity on the basis of the intake air ratio compensation value.

Abstract: A mass airflow based control system for an internal combustion engine is provided which is capable of inferring cylinder air charge during non-steady state periods of operation of the engine. The control system infers cylinder air charge from values of rotational engine speed, air mass flow inducted into the engine, inlet air temperature, engine coolant temperature, and barometric pressure. The control system employs the inferred cylinder air charge value for air/fuel ratio control.

Abstract: Diagnosis of an electronically fuel-injected engine equipped with sensors connected to an on-board microcomputer. Use of a standard personal or portable computer and a connector for electrical connection to the sensors and the on-board computer. An interface device is connected between the connector and the computer to enable the computer to read the values of the operational parameters of the engine as detected by the sensors, and to perform a diagnostic software comparison of the measured values with predetermined values or ranges. The interface device is switchable to a selected sensor or the on-board computer under software control from the computer, and includes a multiple mode measurement device which is also selectively switched to a desired measurement mode by the computer. The computer is then able to selectively measure the operational parameters of the engine, test for correct operation, and display the appropriate diagnostic or tutorial instructions for fault location and rectification.

Abstract: A learning control method for an electronic engine control system in which a variable concerning the adhesion of injected fuel onto a wall surface of an intake manifold, the evaporation of adhered fuel or the runaway of fuel to a cylinder is determined on the basis of a detection value of the operating state of an engine in accordance with a predetermined relational expression and the quantity of fuel injection is controlled on the basis of the determined value of the variable so that a target air/fuel ratio is realized, comprises the steps of determining the degree of deviation of an air/fuel ratio from the target value after the engine has been turned from a steady operating state into a transient operating state, determining a range in which the detection value of the engine operating state as the base of determination of the variable has changed upon occurrence of a fuel injection quantity control error which causes the deviation of the air/fuel ratio from the target value, and correcting a corresponding

Abstract: A vehicle control apparatus comprises various sensors sensitive to vehicle operating parameters for producing signals having values sensed for the respective vehicle operating parameters. The vehicle control apparatus also comprises a transition detector. The transition detector includes a memory for storing threshold values specified for the respective vehicle operating parameters, and a comparator for comparing the sensed values with the respective threshold values in a predetermined sequence to sense a transition in one of the vehicle operating parameters when the value sensed for the one vehicle operating parameter is in a range defined by the threshold value specified for the one vehicle operating parameter. The transition detector is coupled to a control unit for controlling the automotive vehicle for the sensed transition.

Abstract: A method for accurately determining the measure of mass airflow into an internal combustion engine is implemented with a controller that determines measures of various engine parameters, determines a prediction set including at least one predicted value of a measurable engine parameter and at least one predicted value of mass airflow into the engine, determines an estimation set including at least one estimated value of mass airflow into the engine and controls the engine in response to the estimated value of mass airflow.

Abstract: A method of and apparatus for starting and accelerating a vehicle through a range of vehicle speeds during which the vehicle internal combustion engine is operated in a plurality of different operating modes is disclosed. Different operating modes are available during normal operation. Under high demand conditions, the engine may be run as a conventional inefficient but effective throttled engine or converted to operation in a fourth mode as a two-stroke cycle engine. The vehicle management system includes a first read only memory for storing a fixed table of engine operating parameters corresponding to various engine conditions, and a random access second storage means for storing a table of engine operating parameters corresponding to various engine conditions with the second table being initially the same as the first table. The system responds to sensed engine conditions to modify the parameters in the second table and controls the vehicle in accordance with the parameters stored in the second table.

Abstract: To ensure a high-precision simultaneous control of the enginegenerated torque, air fuel ratio of the automobile engine and related factor, the present invention calculates the target air mass flow rate as the air mass flow rate at the inlet port which achieves the target torque, estimates the air flow condition inside the intake manifold, supplies the result to the fuel injection control system and the throttle control system, and determines the fuel injection pulse width which achieves the target air fuel ratio according to the estimated air mass flow rate at the inlet port for the fuel injection control system, while determining the throttle angle which achieves the target torque according to the estimated condition and the target air mass flow rate for the throttle control system.

Abstract: A future value is predicted based on time-serial data of measurement data heretofore available to attain high precision control of fuel injection of an engine, by providing: (1) an unit for determining an acceleration/deceleration level representing a magnitude of acceleration/deceleration of a vehicle based on a displacement of a throttle opening degree in a predetermined time, (2) an unit for predicting the future value by a digital advancing filter based on measurement data heretofore available, and (3) a correction unit for calculating a measurement amount which is under or over when the predicting process is conducted, in accordance with the acceleration/deceleration level, and adding the calculated measurement value to said predicted value to calculate the future value of the measurement data. Where a table for converting outputs of various sensors arranged around the engine etc. to physical amounts such as suction air amount, an unit for increasing the search speed for the table is provided.

Abstract: A method for accurately determining the measure of mass airflow into an internal combustion engine determines measures of various engine parameters and implements the mathematical modeling technique of prediction and estimation.

Abstract: An electronic control module for use in controlling a vehicle comprises a first processor 10 adapted to calculate the fuelling requirements of the engine and spark advance, and also to control a plurality of diagnostic tests for testing engine operating paramenters. A second processor 12 triggers the spark and spark dwell timing together with the start of fuel injection. By such partitioning of tasks, it is possible to provide a wide variety of facilities with a low cost electronic control module. The second processor 12 is adapted to operate the engine in a back-up mode on failure of the first processor 10 by use of look-up tables for fuel pulse width and spark advance. The vehicle therefore remains operational even on failure of part of the electronic control module.

Abstract: A control system for controlling fueling and/or timing of a fuel injector in an internal combustion engine. Fuel injection is controlled based upon the recent operating history of the engine. In particular, the difference between the instantaneous speed and the average speed over a previous predetermined period are compared and the difference is utilized in determining a control variable which in turn can be used for selecting fueling and/or timing values. The difference between the instantaneous fueling and the average fueling over a predetermined period can also be used in selecting the control variable. The fuel injector fueling and/or timing is determined utilizing fueling and/or timing values from at least two maps, with the control variable determining the proportions of the timing/fueling valves to be utilized in determining commanded timing/fueling.

Abstract: A two cycle internal combustion engine with multiple cylinder fuel injection constantly secures an accurate air intake volume and as a result provides good power characteristics through appropriate control of the fuel injection. In order to accomplish this, the pressure inside the crank chamber is detected by a pressure sensor and the timing of the scavenging stroke and the engine speed are detected by determining the crank angle. An ECU then determines amount of air intake from the engine speed and the crank chamber pressure prior to commencement of the scavenging stroke, and the amount of fuel injected from an injector is based on the amount of this air intake.

Abstract: In a fuel control device for an internal combustion engine wherein an estimated pressure (Pi) in the engine intake manifold is calculated by digital filtering an output signal from a H/W sensor by making use of a difference equation, an air flow rate (Qc) at the engine cylinder port is estimated based upon a detected engine rotating number (N) and the calculated estimated pressure (Pi) by retrieving a value of air flow rate from a map defined by the engine rotating number (N) and the estimated pressure (Pi) in the engine intake manifold. Then, the fuel quantity (Tp) to be injected is calculated based upon a detected engine rotating number (N) and the estimated air flow rate (Qc) at the engine cylinder port. However during the engine starting period, a learned estimated pressure in the engine intake manifold is used instead of the calculated estimate pressure (Pi) in the engine intake manifold to determined the retrieved estimated air flow rate (Qc).

Abstract: The fuel supply apparatus for a multiple-cylinder internal combustion engine is comprised of a fuel supply means through which a fuel amount is injected into each combustion chamber of the engine. The fuel amount is corrected by fuel supply amount correcting means in a controller of the fuel supply apparatus, in accordance with intake port pressure near the fuel supply means to maintain a proper fuel injection even in various intake pressure conditions. The intake port pressure is estimated by intake port pressure estimating mean in the controller to search a data map in the intake port pressure estimating means, in accordance with an engine speed, an opening degree of the throttle valve, and an crankangle at the fuel injection start time.

Abstract: A motor vehicle is controlled with a neural network which has a data learning capability. A present value of the throttle valve opening of the engine on the motor vehicle and a rate of change of the present value of the throttle valve opening are periodically supplied to the neural network. The neural network is controlled to learn the present value of the throttle valve opening when the rate of change of the present value of the throttle valve opening becomes zero so that a predicted value of the throttle valve opening approaches the actual value of the throttle valve opening at the time the rate of change thereof becomes zero. An operating condition of the motor vehicle is controlled based on the predicted value of the throttle valve opening, which is represented by a periodically produced output signal from the neural network.

Abstract: An electronic engine control apparatus includes: a plurality of first sensors for detecting the driving action taken in accordance with a driver's intent; a plurality of second sensors for detecting the operating conditions of a vehicle and an engine; a plurality of actuators for controlling the engine; a unit for discriminating the driver's intent of how to drive the vehicle based on output signals from the first and second sensors; and a unit for controlling the engine to match the driver's intent by selectively adjusting at least one of the actuators, in accordance with the discriminated driver's intent.

Abstract: A system for managing operation of a V-twin motorcycle engine that includes a throttle body having an air intake manifold adapted to be mounted to the engine over the cylinder intake ports, and a throttle for control by an operator to admit combustion air into the manifold. A pair of fuel injectors are mounted on the throttle body, and are responsive to electronic injector control signals for injecting fuel into the air intake manifold adjacent to the intake ports. A fuel pump delivers fuel under pressure from a fuel supply, and a pressure regulator is coupled to the pump for supplying fuel at regulated pressure to the injectors. An engine speed sensor is operatively coupled to the engine for supplying an electrical signal as a function of engine speed. A second sensor such as a pressure sensor is operatively coupled to the engine air intake manifold for supplying an electrical signal as a function of combustion air available in the manifold.

Abstract: An air-fuel ratio control apparatus for an internal combustion engine controls a fuel supplying means by a signal generated from an air-fuel sensor so that the air-fuel ratio of a gas mixture to be sucked into the internal combustion engine becoms a target air-fuel ratio. The air-fuel ratio control apparatus corrects the target air-fuel ratio by a parameter on the condition of the engine detected by the detecting means so that a fuel supplying device is controlled to obtain a corrected target air-fuel ratio.

Abstract: A CPU includes a program counter, an execution unit, and a program status word register. A pulse producing unit connected to the CPU includes a plurality of output terminals, a port selection register for designating at least one of the output terminals, and a system for generating a pulse start timing signal, a system responsive to the pulse start timing signal for bringing the designated output terminal into one of two bistable logic states. A counter counts a clock pulse signal and brings the selected output terminal into the other of the bistable logic states when the counter indicates a predetermined elapsed time. Another system responsive to the pulse start timing signal sends a signal to the CPU requesting a macro service operation.

Abstract: An automotive engine is provided with a fuel control system having a fuel injector for injecting a properly controlled quantity of fuel into cylinders of the automobile engine. The control system is adapted to cause the fuel injector to inject an increased quantity of fuel when an engine control value, relative to which the automotive engine changes its speed of rotation for a decision as to whether the automotive engine is in an acceleration state, is higher than a critical level. The control system also detects the transmission coupled to the automobile engine, and changes, when a temperature of the automotive engine is lower than a preselected temperature, the critical level according to the type of transmission detected.

Abstract: A fuel supply control system for an internal combustion engine sets an amount of heat generated within a combustion chamber at least based on an engine load condition, and a reference temperature of an exhaust system on the basis of an engine coolant temperature or other parameter associated with the engine coolant temperature. The control system predicts a temperature in the exhaust system based on the set head amount and set reference temperature. The control system derives a correction value for correcting a fuel supply amount on the basis of the predicted temperature of the exhaust system.

Abstract: An engine controller includes a first calculation unit for calculating an amount of fuel injection and ignition timing by a first interrupt process in response to a TDC signal and calculating fuel injection start timing and ignition timing by a higher-order interrupt process having a higher priority than the first interrupt process, a second calculation unit for obtaining a value representing a proportion of the interrupt execution time contained in one interrupt period in accordance with the period of the first interrupt process and the interrupt execution time and comparing the value of the proporiton with a predetermined value, and an inhibition unit for omitting or inhibiting the execution of a next interrupt process by the first calculation means when the interrupt execution time contained in one interrupt period exceeds a predetermined value.

Abstract: A digital fuel control system for a small internal combustion engine having a pressure sensor for detecting the instantaneous pressure in the air intake manifold of the engine to generate air pressure data. A microprocessor responsive to the air pressure data generates a fuel quantity output signal indicative of the quantity of fuel to be delivered to the engine. A fuel metering apparatus responsive to the fuel quantity output signal generated by the microprocessor meters the fuel being delivered to a fuel delivery mechanism which delivers the fuel into the air intake manifold of the engine. The microprocessor in response to the air pressure data generated by the pressure sensor determines the engine's speed and the average pressure of the air inhaled by the engine. The engine speed data and air pressure data address a look-up table to extract data indicative of the fuel requirements of the engine.

Abstract: An engine fuel delivery control system includes an engine having at least one fuel injector fuel injector responsive to electronic control signals for delivering fuel to the engine cylinders and a plurality of sensor for supplying electrical sensor signals as various functions of engine operating conditions. An electronic engine control unit includes an electronic memory storing engine control parameters in a variety of look-up tables, a microprocessor-based controller for periodically addressing the memory tables and obtaining required control parameters as a function of sensor signal inputs, and circuitry for supplying control signals to the injectors as a predetermined function of the control parameters obtained from the look-up tables.

Abstract: A system for managing operation of a V-twin motorcycle engine that includes a throttle body having an air intake manifold adapted to be mounted to the engine over the cylinder intake ports, and a throttle for control by an operator to admit combustion air into the manifold. A pair of fuel injectors are mounted on the throttle body, and are responsive to electronic injector control signals for injecting fuel into the air intake manifold adjacent to the intake ports. A fuel pump delivers fuel under pressure from a fuel supply, and a pressure regulator is coupled to the pump for supplying fuel at regulated pressure to the injectors. An engine speed sensor is operatively coupled to the engine for supplying an electrical signal as a function of engine speed, and a pressure sensor is operatively coupled to the engine air intake manifold for supplying an electrical signal as a function of manifold air pressure.

Abstract: A fuel control system for an engine has a fuel injector which injects fuel into an intake passage communicating with a combustion chamber. The quantity of a direct delivery part of fuel injected from the fuel injector which is directly fed to the combustion chamber is estimated, the quantity of a drawn part of fuel which has been on a wall surface of the intake passage and is vaporized and fed to the combustion chamber together with the direct delivery part is estimated, and the quantity of fuel to be injected from the fuel injection means is dcetermined on the basis of the estimated quantities of the direct delivery part and the drawn part so that the sum of them provides a desired quantity of fuel to be fed to the combustion chamber. The estimated quantity of at least one of the direct delivery part and the drawn part is increased as a factor which governs the degree of evaporation of the fuel on the wall surface changes in such a direction as to promote evaporation of the fuel on the wall surface.

Abstract: A method for the adaptation of a precontrolled value for a feedback control is based on the realization that, whenever the operating conditions coincide with the calibration conditions for the initial determining of precontrolled values, no control-manipulated variable deviations may occur in all the operating ranges, and that accordingly deviations which are nevertheless observed are a sign that the calibration conditions no longer exist. This may be caused by aging effects or by uncompensated disturbances. The method establishes the differences in control-manipulated variable deviations over different classes of an influencing variable. For each influencing variable class, a correction value is then determined such that, by means of the correction value, the error previously observed for the respective range is compensated during operation of the controlled system.

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 fuel supply control system for an internal combustion engine having an intake pipe, and a throttle valve arranged in the intake pipe. A basic value of a fuel amount to be supplied to the engine is determined based on a load on the engine. The determined basic value of the fuel amount is corrected by a correction value for increasing the fuel amount during and/or after acceleration of the engine. The correction value is determined based on a change in the opening degree of the throttle valve. The correction valve is further determined based on a change in the magnitude of the load on the engine.

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: A car control apparatus in which correction characteristics indicating whether or not various control constants are proper or not are calculated through loop control of one of the car's operation parameters, such as the air-fuel ratio, on the basis of the air-fuel ratio correction factors subjected to learning to thereby rationalize the control constants such as the fundamental injection time so as to realize proper fuel injection and proper ignition timing control.

Abstract: An airflow meter detects an amount of intake air flowing through an intake passage of the engine, and a fuel injector injects fuel in an amount which is determined according to the amount of intake air detected by the airflow meter. A controller calculates moving averages of outputs of the airflow meter, and the ratio of the difference between each output of the airflow meter and the moving average to a value derived from the moving average. The controller causes the fuel injector to increase the amount of fuel to be fed to the engine when the ratio is not smaller than a predetermined reference threshold value.

Abstract: An automotive fuel injection system for detecting as quickly as possible the occurrence of acceleration without employing a throttle sensor to thereby perform an asynchronous fuel injection for the purpose of maintaining the air-to-fuel ratio of the combustible air-fuel mixture at an optimum value during the acceleration of the automotive engine. The automotive fuel injection system comprises a device for comparing the pressure inside the fuel intake system with an average value of the pressures inside the fuel intake system. When the pressure prevailing in the fuel intake system deviates by a predetermined quantity from the average pressure inside the fuel intake system, acceleration is deemed as actually occurring in the automotive engine and, hence, asynchronous fuel injection is effected substantially simultaneously with the detection of the occurrence of engine acceleration.

Abstract: An apparatus for detecting the degree of opening of a throttle valve of an engine. A first value indicating the degree of opening of the throttle valve and a second value indicating the opening of the throttle valve in an idling position are detected and stored. Whether the first value is kept unchanged for a fixed interval is decided when the throttle valve is in an idling position. A stable value of the first values is provided when the first value is kept unchanged for a fixed interval and the throttle valve is in an idling position. Then the second value is updated to the stable value. A value indicating the difference between the stored first and second values is calculated. The calculated value is used to control the amount of fuel supplied to the engine.

Abstract: In order to control all revolution numbers of an engine at high precision, combustion of each cylinder is reliably controlled. For the combustion control of each cylinder, there are controlled measurement timings of an air volume as well as a fuel volume contributive to the combustion and exhaust gas being a combustion result, calculation timings of a fuel injection volume and an ignition timing, and output timings of fuel injection and/or ignition. These timings are synchronized by crank angle positions from a reference point such as top dead center. Particularly as to the measurement timing, a delay time of a gas stream between a measurement spot and the cylinder is compensated in terms of a crank angle corresponding thereto, whereby the variables to be measured are synchronized.

Abstract: A fuel injection control system assumes fuel amount introduced in an engine combustion chamber on the basis of an air/fuel ratio dependent value derived by monitoring an air/fuel ratio dependent component in an exhaust gas, and an intake air amount introduced into the combustion chamber, assumes wetting fuel amount to be consumed for wetting an induction system on the basis of the fuel amount introduced into the combustion chamber and a fuel injection amount injected up to the immediately preceding fuel injection cycle, and prospect fuel amount to be introduced into the combustion chamber on the basis of the current fuel injection amount and the wetting fuel amount. The prospected fuel amount to be introduced into the combustion chamber is compared with a target fuel amount which is derived according to the engine driving condition for modifying the fuel injection amount so that the prospected fuel amount coincides with the target fuel amount.

Abstract: A method is disclosed for the operation of a data processing system for motor vehicles including at least two computers and a line connecting the computers for the transmission of messages. This line permits a fast and reliable data transmission between the computers installed in the motor vehicle, taking into account the specific requirements of a controller-coupling in the motor vehicle. An embodiment is provided which describes in detail the interface between the individual computers and the line linking the computers, and with the aid of which a controller-coupling is realized in the vehicle.

Abstract: An operation control system for an engine using alcohol fuel or mixed fuel of alcohol and hydrocarbon, or for an engine supplying cooling liquid such as alcohol, water or the like as fuel. Vapor concentration in exhaust gas and an air excess ratio of air-fuel mixture are detected, and a supply rate of alcohol, a water absorption ratio of alcohol or an amount of the cooling liquid is computed on the basis of the vapor concentration and the air excess ratio. Ignition timing, temperature of the coolant, a compression ratio and an air excess ratio are controlled on the basis of the supply rate of alcohol or the water absorption ratio of alcohol. Further, the cooling liquid is supplied which has its amount computed at a heavy load. Thus, operational performance of the engine is improved.

Abstract: A data communication control system includes first and second control units each having a microcomputer, the second control unit carrying out a first interrupt processing which starts in accordance with a first timing signal having a first period, and a second interrupt processing which starts in accordance with a second timing signal having a second period, the second interrupt processing being for the second control unit to receive data transferred from the first control unit. The second timing signal is generated in the first control unit in such a manner that adjacent ones of the second timing signal have values of the second period different from each other. Therefore, even if the first interrupt processing and the second interrupt processing conincide with each other the coincidence is not continued whereby transfer of data can be reliably carried out.

Abstract: An engine control system is disclosed in which the air-fuel ratio is controlled by feedback in accordance with the oxygen concentration detected of the exhaust gas, and a feedback control system thereof separate learning compensation values for compensating for the changes of the input/output characteristics of an air flow meter and a fuel injector respectively.

Abstract: A fuel injection control system for controlling the amount of fuel to be injected to an internal combustion engine. The fuel injection control system consists of a control unit arranged to calculate the fuel injection amount in accordance with a standard injection amount corrected with a transient correction amount. The transient correction amount is calculated in accordance with a difference value and a correction coefficient which is previously set in accordance with engine operating condition. The difference value is of between an equilibrium amount of adhering and floating fuel in steady state in an intake system and a predicted variable of amount of the adhering and floating fuel at a predetermined point of time.

Abstract: An electronic fuel injection system for an internal combustion engine comprising an electronic control system having a central processing unit for detecting engine speed, throttle setting regulating air supply to the engine, exhaust gas concentrations, and for controlling fuel injection. The central processing unit also calculates an open basic injection time, corrected by sensors for engine cooling water and air supply temperature and a closed-loop injection time using an exhaust gas sensor.

Abstract: An arrangement for the detection of speed signals of a control device controlling the fuel feed in an internal combustion engine is suggested, in which an (inductive) pulse generator is used in connection with a tested sensing arrangement. The point in time of the detection of the speed signal is freely controllable within a crankshaft and/or camshaft revolution. A minimization of the time interval between the signal detection and the output of the output signals dependent on the speed signals is accordingly achieved. In this way, the phase rotation in the control circuit is minimized and the dynamic behavior is accordingly decisively improved.

Abstract: A fuel injection system for a multiple cylinder two-stroke cycle engine having a plurality of cylinders provided with intake manifolds, respectively, comprises a plurality of fuel injectors each operatively connected to its respective intake manifold, a controlling unit operatively connected to the fuel injectors for controlling fuel injection of the fuel injectors, and a unit operatively connected to the fuel injection controlling unit for detecting the revolution number or speed of the engine. The fuel injection controlling unit includes a micro computer for carrying out calculations in response to information from the engine revolution operation detecting unit so as to inject the fuel a plurality of times with equal angular intervals defined therebetween during one revolution of the engine, or the crank shaft, during the neutral and low revolution periods of the engine.

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: A fuel injection controlling device for a two-cycle engine comprising an air manifold; a throttle valve; a fuel injector; a fuel supply system including a fuel pump; a battery voltage sensor; an air temperature sensor; an engine speed sensor; a timing sensor; a barometric pressure sensor; a throttle position sensor; a first data processor for receiving and processing sensing signals for determining fuel injector duration and timing and fuel pump operating speed; a first data processor temperature sensor for sensing the relative temperature of certain electronic components in the first data processor; a heater operatively associated with the first data processor electronic components for selectively heating the electronic components; and a second data processor operable independently of the first data processor for receiving an electronic component temperature sensing signal and for generating a control signal to the heater responsive thereto for heating the components when the temperature thereof is below a p