Abstract: In an rpm control device for an internal combustion engine, a loop for adjusting a suction rate of the engine to a target value and a loop for adjusting a speed (rpm) of the engine to a target value are operated in combination, so that the suction rate and the engine speed are adjusted quickly.

Abstract: An electronic control device for internal-combustion engines wherein the quantity of air taken in is decreased when the engine speed is greater than a target value, that is, when the deviation of the number of revolutions of engine is positive, with the engine in a slow-speed hunting state, and the quantity of air taken in is increased when the engine speed is less than a target value, that is, when the deviation of the number of revolutions is negative, or wherein the quantity of air taken in is decreased when at least one of the quantity of air taken into the engine, intake pipe pressure, and a value obtained by dividing the quantity of air taken in by the number of revolutions is greater than the target value, that is, when the deviation is positive, with the engine in the slow-speed hunting state, and also the quantity of air taken in is increased when it is less than the target value, that is, when the deviation is negative, thereby controlling the aforementioned parameters to their target values and acc

Abstract: Signals from a intake air quantity sensor disposed in the intake air passage of an internal combustion engine are calculated to obtain a basic value corresponding to an amount of fuel required for the engine; the basic value is corrected by a negative feed-back control on the basis of the output of an air-fuel ratio sensor so as to obtain a desired air-fuel ratio to thereby supply the fuel to the engine by controlling a fuel control valve. A fuel control device comprises a writing means for writing in a memory a value of negative feed-back correction or a value related thereto when the output of the intake air quantity sensor is in the vicinity of a representative point, a correcting means for correcting the basic value on the basis of data in the memory and a valve controlling means to close a control valve which controls feeding of vaporized fuel caught in a canister to the air intake system of the engine when the value of negative feed-back corection or the value related thereto is written in the memory.

Abstract: A rotational frequency control apparatus of an internal combustion engine comprising a bypass route bypassing a throttle valve provided to an intake pipe of internal combustion engine, an intake control valve which controls an intake amount of this bypass route, an intake drive and control device which drives and controls open and close conditions of this intake control valve, and moreover, an intake amount sensor which detects the intake amount of the intake pipe, a rotational frequency sensor which detects a rotational frequency of the engine, a rotational frequency adjusting part which generates a target intake amount based on an actual rotational frequency detected by the rotational frequency sensor and a target rotational frequency, an intake amount adjusting part which outputs an intake control signal based on the target intake amount and the actual intake amount detected by the intake amount sensor, a switching part which causes both adjusting parts to make output operations under an unloaded condition

Abstract: A fuel control apparatus comprises a fuel supplying means for supplying fuel to an internal combustion engine depending on the operation of a fuel control valve, a hot-wire type intake air quantity sensor disposed in an air-intake passage for the internal combustion engine to detect the quantity of air passing therethrough, a memory means which is adapted to accumulate an output from the intake air quantity sensor, the number of revolution of sand internal combustion engine, or the length of time in operation of the internal combustion engine, and holds the value obtained by the accumulation after the engine is stopped, and a control means for heating a hot wire at a temperature higher than a temperature in the normal operation so as to burn off a deposit on the hot wire after the accumulated value in the memory means reached a predetermined value and the engines is stopped.

Abstract: A fuel control device for internal-combustion engines in which a proper correction value is calculated from the contents of memories corresponding to adjacent representative points, meeting every condition of the amount of mixture drawn in, by selecting representative points to represent the tendency of a flow-dependency characteristic change of intake sensor output, thereby obtaining a proper correction value in a region where the negative feedback of air-fuel ratio is controlled as well as in a region where the negative feedback can not be controlled.

Abstract: A system for controlling the operation of an internal combustion engine on the basis of air/fuel ratios and engine loads. A flow rate of intake air sucked into the engine and the cycle of engine revolutions are detected to determine an average flow rate of intake air, which is then used in cooperation with a compression ratio and an engine displacement to determine a net flow rate of intake air or the charging efficiency of the engine. This parameter represents a precise engine load and is used to regulate fuel injected into the engine. As a result, engine operations may be optimally controlled even during transitional operating states of the engine.

Abstract: A fuel control apparatus comprises a hot-wire type intake air quantity sensor disposed in an air intake passage for an internal combustion engine to detect the quantity of air passing therethrough, a burn-off control section for heating a hot wire at a temperature higher than a temperature in the normal operation, after the engine has been stopped, so as to burn off a deposit on the hot wire, wherein the operation of the burn-off control section is stopped when an output from the sensor exceeds a predetermined value. A signal indicative of a trouble in the sensor can be generated.

Abstract: A fuel control apparatus comprises a hot-wire type intake air quantity sensor disposed in an air intake passage for an internal combustion engine to detect the quantity of air passing therethrough, a fuel control valve placed in the air intake passage and injecting fuel, a burning-off section for heating a hot wire at a temperature higher than a temperature in a normal operation, after the engine has been stopped, so as to burn off a deposit on the hot wire, wherein the operation of an injector is stopped by detecting an output of the sensor for a predetermined time to thereby prevent undesired firing of the fuel.

Abstract: In a fuel control apparatus having a hot-wire type intake air quantity sensor for burning-off a deposit on a hot wire, the hot wire is heated when the output of the sensor indicates that suction of air in an intake air passage for an engine is stopped or when a certain time goes on after the generation of the output, or when the output of the sensor is lower than a predetermined value under the condition that a fuel control valve is deenergized and an engine stop flag is reset after a power source switch has been turned off.

Abstract: A fuel injection control system for an internal combustion engine having means for limiting a fuel amount to be supplied to the engine according to an output of an air flow sensor to a predetermined upper limit value, and means for correcting the intake air flow rate by the output of the air flow sensor when the opening of an intake air throttle valve is opened at a predetermined value, thereby limiting the output of the sensor to the predetermined upper limit value in case that the output of the sensor increases larger than the actual value and correcting the air density if different from a reference by the correcting means.

Abstract: A fuel control apparatus comprises a burn-off control section for heating a hot wire at a temperature higher than a temperature in the ordinal operation of an internal combustion engine after the engine is stopped, so as to burn off a deposit on the hot wire, and a burn-off prohibiting section for prohibiting its operation after the engine stop by detecting that an output value from a hot-wire type intake air quantity sensor has reached a predetermined level.

Abstract: A fuel control apparatus for an internal combustion engine includes an electronic control unit which has a memory to be set when the engine is operated under a given condition for a given time after a predetermined time has passed from the starting of the engine, or the engine is warmed up to reach a predetermined temperature. Burning-off operation is carried out when the memory is in the set condition after the engine has been stopped to thereby remove a deposit on a hot wire.

Abstract: A fuel control apparatus for an engine has a temperature sensor for detecting the temperature of the intake air to the engine, and is constructed to correct the upper limit value of the intake air amount preset in response to the operating characteristic of the engine in the operating range of the engine which does not exhibit the true value of the intake air amount by the detected output of the air flow sensor due to the reverse-flow effect of the intake air of the engine by the detected temperature by the temperature sensor.

Abstract: A fuel injection control system in which the output of a hot-wire air flow sensor is limited to a maximum value in order to compensate for return blow at low-speed, high-power conditions. However, the maximum value is adjusted for altitude and temperature.

Abstract: A novel and improved fuel-injection control system for an internal combustion engine capable of effecting minute or fine revisions of acceleration of an engine by appropriately processing an output signal from an AFS without employing a throttle sensor for detecting the opening degree of a throttle valve. The width of a basic injection pulse is calculated from the amount of intake air sucked into an internal combustion engine and the number of engine revolutions so that between the injection pulses synchronized with the number of engine revolutions, a series of special injection pulses having the calculated pulse width are generated for revision of engine acceleration.

Abstract: A fuel control apparatus for an engine has an atmospheric pressure sensor for detecting the atmospheric pressure in the vicinity of the engine, and is constructed to correct the upper limit value of the intaken air amount preset in response to the operating characteristic of the engine in the operating range of the engine which does not exhibit the true value of the intaken air amount by the detected output of the air flow sensor due to the reverse-flow effect of the intaken air of the engine.

Abstract: An RPM control apparatus for an internal combustion engine including a first limiter which suppresses an RPM feedback control signal indicating a target suction quantity or a target suction pipe pressure within a predetermined range that is set necessary and sufficient for covering a fluctuation range attributed to a no-load loss of the engine, and a second limiter which suppresses a suction feedback control signal on the basis of the output of the first limiter and an actual suction air quantity or suction pipe pressure within a predetermined range that is set necessary and sufficient for covering a fluctuation range attributed to the density of suction air, etc.

Abstract: An RPM control apparatus for an internal combustion engine capable of stopping the operation of an RPM adjuster which generates an RPM feedback control signal indicating a target suction quantity signal or a target suction pipe pressure signal for the engine in relation to the RPM of the engine and a target RPM thereof, and/or the operation of a suction adjuster which generates a suction feedback control signal in relation to the output of the RPM adjuster and an actual suction quantity or an actual suction pipe pressure of the engine, when at least one of the output of the adjusters exceeds a corresponding predetermined value.

Abstract: A suspension device for automobile performs changing-over of the damping force of a shock absorber and the spring constant of a suspension spring by an output from an acceleration sensor or an output from a road clearance sensor mounted on the vehicle body. The changing operation is not performed by magnitude of an output but is performed only when an output greater that a predetermined level continues for a predetermined time period to avoid unnecessary change-over operations of the suspension characteristic during cruising a rough road.