Abstract: A hydraulic apparatus for adjusting the timing of opening and closing of an engine valve of a prior art has the drawback that sludge from the oil pressure chamber tends to accumulate on the inner surface of the housing of the actuator, which controls the rotor in a valve timing adjusting system for controlling the valve timing of the engine. This causes troubles in the operation of the rotor. In the present invention, while the fuel delivery to the engine M1 is being cut off, the hydraulic media providing means M10 is controlled by the timing advance control means M13 to rotate further the rotor from the position at the moment that the fuel delivery is cut off, so as to clean the inner side of the housing of the actuator M9, the control of the setting and the execution of the cleaning mode is carried out by a cleaning condition judging means M14. A mode exchange means M15 controls the hydraulic media providing means M10 to exchange its normal mode and the cleaning mode, according to the state of the engine.

Abstract: A valve timing controlling device of internal combustion engine having a means for controlling an actual valve timing which controls the actual valve timing so as to converge at a target valve timing, a means for controlling integration which corrects a controlled variable, the means for controlling actual valve timing, and means for terminating integration which terminates integration performed by the means for controlling integration when the actual valve timing is heading to the target valve timing, by which the actual valve timing can stably be converged at the target valve timing and a steady-state deviation between the actual valve timing and the target valve timing can be eliminated because the means for controlling integration performs integration when the steady-state deviation exists between the actual valve timing and the target valve timing, namely when the actual valve timing does not converge at the target valve timing.

Abstract: A valve timing control system for an internal combustion engine which is capable of making an actual valve timing converge rapidly to a desired valve timing immediately after power-on includes a desired valve timing arithmetic means (202) for arithmetically determining desired valve timings (To) for an intake valve (17) and an exhaust valve (18), respectively, in dependence on an engine operation state (D) as detected, a variable valve timing mechanism (40) for changing open/close timings of the intake valve (17) and the exhaust valve (18), an actual valve timing detecting means (203) for detecting actual valve timings (Ta) of the intake valve (17) and the exhaust valve (18), respectively, an actual valve timing control means (204) for generating a control quantity (i) for the variable valve timing mechanism (40) so that a timing deviation (ER) of the actual valve timing (Ta) from the desired valve timing (To) becomes zero, an integral control means (205) for arithmetically determining an integral correcting

Abstract: A cylinder identified apparatus for a multi-cylinder internal combustion engine can prevent abnormal or erroneous engine control based on misidentification of cylinders due misfiring, thus avoiding possible damage to the engine. A signal generator 108 generates a reference position signal L in synchronization with the rotation of the engine, the reference position signal L comprising a series of a specific pulse corresponding to a specific cylinder and remaining pulses corresponding to the remaining cylinders. Each pulse of the reference pulse signal L has a rising edge and a falling edge respectively corresponding to a first reference position and a second reference position of a piston in a corresponding cylinder. The rising edge of each specific pulse is angularly coincident with that of each remaining pulse, whereas the falling edge of each specific pulse is angularly offset from that of each remaining pulse.

Abstract: An engine-controlling atmospheric pressure detection system which is capable of detecting atmospheric pressure highly frequently, even during descending, based on a signal from a pressure sensor for detecting air-intake pressure. An actual air-intake pressure is normalized in relation to air-intake pressures at high and low altitudes, respectively, when a throttle valve is closed, which pressures have been stored in a ROM, thereby determining the resultant value as a parameter. The atmospheric pressure is thus detected from the minimum value of such a parameter.

Abstract: A flow quantity valve controller includes a unit for positioning so that a phase of a stepper motor becomes a predetermined phase when a motor shaft making a linear move with rotation of the stepper motor is pulled most into the stepper motor side. When the motor shaft is pulled most into the stepper motor side, a flow quantity valve controller changes a stepper motor drive signal to a drive signal corresponding to a predetermined phase.

Abstract: A device for controlling an ignition timing of an engine wherein a basic ignition timing map classified based on a revolution number and an intake quantity of the engine is provided in a main body of a control device and a target ignition timing of the engine is set based on the basic ignition timing map, said main body of a control device comprising: an idling state detecting means for detecting that the engine is in an idling state; and an ignition timing limiting means for comparing a basic ignition timing read from the basic ignition timing map with a predetermined limited ignition timing when the idling state detecting means detects the idling state and selecting the limited ignition timing as the target ignition timing when the basic ignition timing is retarded compared with the limited ignition timing.

Abstract: An apparatus detects occurrence of a fault in an exhaust gas recirculation (EGR) control system of an internal combustion engine. An intake air amount is changed by a predetermined quantity, which is determined in dependence on an operation state of the engine, when an EGR control valve is temporarily opened or closed. A determination is made as to whether a pressure within an intake pipe of the engine has changed after opening or closing of the EGR control valve. On the basis of the result of the above determination, occurrence of a fault in the EGR control system is determined. Regardless of resolution of an A/D converter which is employed in the EGR control system for performing A/D conversion of an analog signal indicative of a sensed intake air pressure, a fault thereof can be detected with high accuracy.

Abstract: An electronic control apparatus for an internal combustion engine includes a microprocessor for calculating an atmospheric pressure value by using an arithmetic formula in which the ratio of a charging efficiency obtained by an intake air flow rate to a memorized set value is used, wherein the microprocessor calculates the atmospheric pressure value when a steady operation detecting means detects the operational condition of the engine to be a steady operation for a first predetermined period of time, and uses the calculated atmospheric pressure value in order to control the engine only when the steady operation detecting means detects the engine to be the steady operation for a second predetermined period of time.

Abstract: An air-fuel ratio control device for an internal combustion engine comprising:a first air-fuel ratio sensor for detecting concentrations of specified components of exhaust gas provided at an exhaust system of an internal combustion engine and on upstream side of a catalytic converter for purifying the exhaust gas; a low-pass filter for removing a high-frequency component of an output signal of the first air-fuel sensor; an air-fuel ratio comparing and determining means for comparing an output signal of the low-pass filter with a set value and determining a comparison value; an air-fuel ratio correction quantity calculating means for calculating an air-fuel ratio correction quantity corresponding with an output signal of the air-fuel ratio comparing and determining means; an air-fuel ratio controlling means for controlling an air-fuel ratio of the internal combustion engine corresponding with the air-fuel ratio correction quantity; a second air-fuel ratio sensor for detecting the concentrations of the specifie

Abstract: An engine speed control apparatus including an air control valve which controls the cross-sectional area of a bypass passage provided so as to bypass the throttle valve of the engine. The apparatus also includes a control unit which controls a degree of opening of the air control valve on the basis of a synthesized quantity which is obtained by synthesizing a basic air quantity for maintaining a target engine speed and an engine speed feed-back correction quantity which effects to eliminate an error between the target speed and an actual engine speed. An atmosphere pressure sensor is used to detect an atmospheric pressure, and a correction circuit is used to ensure that the synthesized quantity corresponds with the detected atmospheric pressure the engine is started.

Abstract: A control apparatus for an engine comprises an air-fuel ratio sensor for detecting an air-fuel ratio on the basis of an exhaust gas component from the engine, a fuel controller which receives an output from the air-fuel sensor so as to feed-back-control a fuel quantity in response to the operating conditions of the engine so that the air-fuel ratio becomes optimum, a fuel supplier to supply fuel on the basis of a signal from the fuel controller, and a target advance angle value changer which selects a fixed advance angle value for ignition timing independent from the operating conditions of the engine when an instruction signal for adjusting the ignition timing is generated from an ignition timing adjustment signal generator, an ignition device which effects ignition in accordance with an output from the target advance angle value changer, and a feed-back control stopping device which stops the feed-back control of the air-fuel ratio when the instruction signal is generated from the ignition timing adjustment

Abstract: A control apparatus for an engine comprises an air-fuel ratio sensor for detecting an air-fuel ratio on the basis of an exhaust gas component from the engine, a fuel controller which receives an output from the air-fuel sensor so as to feed-back-control a fuel quantity in response to the operating conditions of the engine so that the air-fuel ratio becomes optimum, a fuel supplier to supply fuel on the basis of a signal from the fuel controller, and a target advance angle value changer which selects a fixed advance angle value for ignition timing independent from the operating conditions of the engine when an instruction signal for adjusting the ignition timing is generated from an ignition timing adjustment signal generator, an ignition device which effects ignition in accordance with an output from the target advance angle value changer, and a feed-back control stopping device which stops the feed-back control of the air-fuel ratio when the instruction signal is generated from the ignition timing adjustment

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 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 an idling adjusting method for the engine of a vehicle, an intake air quantity for the engine is adjusted independent of a flow rate control device so that a revolution number correcting signal or a signal related thereto is within a predetermined value, by providing a reference signal generating device which outputs a reference control signal necessary for maintaining a target engine revolution number, a correction signal generating device which generates a revolution number correction signal in the direction to reduce the deviation between an actual engine revolution number of engine and the target engine revolution number and the flow rate control device which controls the intake air quantity for the engine so as to increase or decrease by receiving the reference control signal and the revolution number correction signal, wherein the reference control signal is changed dependent on atmospheric pressure.

Abstract: An abnormality detecting device for an EGR system comprises an EGR valve disposed in an EGR passage to control a flow rate of exhaust gas recirculated therethrough, a first temperature detecting device disposed in the EGR passage to detect the temperature of the same, a second temperature detecting device disposed in the intake air passage of an internal combustion engine, an operational condition detecting device to output parameters of the engine or the EGR valve as signals indicating operational conditions of the engine, an EGR abnormality determining zone discriminating device adapted to discriminate that the operational conditions are in a predetermined EGR abnormality determining zone in the operable area of the engine or the EGR valve in which recirculation of the exhaust gas is controlled by the EGR valve, and an abnormality determining device to determine abnormality in the EGR system on the basis of a quantitative relation between a value of the EGR abnormality determining temperature which is obtai

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: A fuel control apparatus for an internal combustion engine which comprises a pressure detecting means for detecting a pressure in a bypass air passage which bypasses a throttle valve in an air intake system for an internal combustion engine, a first estimating means for estimating a value corresponding to the effective cross-sectional area of the bypass air passage, a second estimating means for estimating a pressure in an intake air pipe of the air intake system on the basis of a pressure value detected by the pressure detecting means and an estimated value of effective cross-sectional area obtained by the first estimating means, and an operating means for calculating a fuel injection quantity on the basis of an estimated value of pressure in the intake air pipe which is obtained by the second estimating means.

Abstract: A detecting device for detecting abnormality in an EGR system comprises an EGR valve disposed in an EGR passage to control a flow rate of recirculated exhaust gas, a first temperature sensor disposed in the EGR passage to detect the temperature of the same, a second temperature sensor disposed in the air-intake passage of an engine, an EGR abnormality determining zone discriminating means to discriminate a specified operational zone in an operable area for the engine in which recirculation of the exhaust gas is controlled by the EGR valve. Abnormality in the EGR system is detected on the basis of a value obtained by comparison of the output of the first and second temperature sensors in the specified operational zone.