Abstract: A valve timing control system for an internal combustion engine, comprising a required advance amount calculating section for calculating a required advance amount on the basis of operating condition of the engine, a valve timing control section for calculating a valve timing control variable on the basis of an obtained advance amount and the required advance amount calculated by the required advance amount calculating section, and a time period measuring section for measuring an elapsed time after the start of the engine. The required advance amount calculating section makes a calculation so that the required advance amount assumes a value smaller than that in an normal state until the time period measuring section measures a predetermined period of time. Hence, exhaust gas clarification immediately after the engine start, fuel consumption and drivability can be improved.

Abstract: In order to improve estimation accuracy of estimating the value of the NOx exhaust concentration, the air fuel ratio control apparatus is adapted to estimate the NOx exhaust concentration from at least either one of a value depending on the air fuel ratio or a value depending on the exhaust gas recirculation quantity and a value depending to the ignition timing by means of the ECU 230.

Abstract: A device for controlling the rise of the catalyst temperature in an internal combustion engine, capable of quickly raising the catalyst temperature at the start to satisfy the exhaust gas regulations to a sufficient degree.

Abstract: A control system for a cylinder injection type internal combustion engine which can improve exhaust gas quality, fuel cost performance and combustion behavior of the engine. The system includes a means (13) for injecting fuel directly into cylinders, an ignition means (8, 9, 10, 11), a means (7) for regulating an intake air quality (Qa), a control means (12A, 12B) for controlling the fuel injection valves (13), the ignition means (8, 9, 10, 11) and the intake air flow regulating means (7) in dependence on the engine states. Additionally, using this control system, the fuel injection timing and ignition timing can be set accurately to values optimal for the currently validated combustion mode even in transient operation phases of the engine and regardless of variance in the mechanical structure of the intake system.

Abstract: A fuel injection control system for a cylinder injection type internal combustion engine, which system suppresses occurrence of torque shock upon changeover of combustion modes while protecting combustion performance of the engine from degradation to thereby enhance drivability of a motor vehicle equipped therewith. The control system includes a means (21) for detecting cylinder-charged intake air quantity information (Qai), a means (22) for setting a combustion mode (M) of the engine, a means (24) for setting a desired air-fuel ratio (A/Fo), a means (25) for setting a desired intake air quantity (Qao) conforming to the combustion mode, a means (27) for setting a fuel injection quantity (Qf) for the fuel injector means (13) so that the desired air-fuel ratio (A/Fo) is realized, a means (26) for setting a throttle valve opening degree so that the desired intake air quantity can be realized, and a means (23) for changing over the combustion modes.

Abstract: A control device for an internal combustion engine includes a crank angle detecting device, which detects the crank angle of the internal combustion engine; a cam angle detecting device, which is installed in a variable cam shaft which variably rotates with respect to a crank shaft and detects a cam angle; a device for generating a cylinder identifying signal, which is separately located from the cam angle detector and generates the cylinder identifying signal, which identifies cylinders of the internal combustion engine; a device for varying valve timing, which varies the cam angle with respect to the crank angle; a valve timing controller, which controls the varying valve timing device; and a mechanism for controlling the internal combustion engine even when the cam angle detecting device is troubled because a control of supplying fuel and igniting is based on an identification of the cylinders by a signal from the device for generating the cylinder identifying signal.

Abstract: A device for controlling the rise of the catalyst temperature in an internal combustion engine, capable of quickly raising the catalyst temperature at the start to satisfy the exhaust gas regulations to a sufficient degree.

Abstract: A valve timing control system comprises a learning means for learning the phase difference between the crank angle and the cam angle at a position where the variable valve timing means is stopped mechanically and a valve timing control variable calculating means for calculating a valve timing control variable, for driving the variable valve timing means, on the basis of a deviation between the phase difference value learned by the learning means and the phase difference calculated by the advance amount calculating means. The learning means learns the phase difference between the crank angle and the cam angle at the mechanically stopped position when the internal combustion engine is not idling. Thus, errors resulting from the operating force of a cam shaft are not included in the maximum retardation value, which ensures precise learning of the maximum retardation value and high-precision valve timing control.

Abstract: A control system for a cylinder injection type internal combustion engine is capable of realizing improvement of the combustion state and reduction of harmful components contained in an exhaust gas by enhancing an air-fuel ratio control accuracy in EGR control. The system includes an air flow sensor for detecting a quantity of intake air, an air-fuel ratio sensor for detecting an air-fuel ratio of exhaust gas, means for controlling exhaust gas recirculation quantity to a desired exhaust gas recirculation quantity by means of an exhaust gas recirculation regulating means, and means for setting a fuel injection quantity of the fuel injection valve in dependence on a controlled desired air-fuel ratio within engine cylinder, intake air quantity and injection mode being validated. The exhaust gas recirculation quantity control means performs a feedback control on the exhaust gas recirculation quantity so that the air-fuel ratio of the exhaust gas coincides with the desired exhaust gas air-fuel ratio.

Abstract: A fuel injection control assembly for a cylinder-injected engine includes a mean fuel pressure calculating element for calculating mean fuel pressure, a fuel pressure regulator for adjusting the fuel pressure, an injection pulse calculating element for calculating an injection pulse duration for an injector based on the mean fuel pressure, and a cycle modifying element for modifying the calculation cycle for the mean fuel pressure in response to the running speed of the engine or of a high-pressure pump, the cycle modifying element setting the calculation cycle to a length greater than or equal to a running cycle of the high-pressure pump to ensure that the number of times that fuel pressure is detected within each calculation cycle of the mean fuel pressure calculating element is greater than or equal to a predetermined number of times.

Abstract: An engine controlling apparatus is provided in which a stable limp-home drive is possible even if an open breakdown of a throttle valve occurs. The apparatus includes a throttle breakdown detecting unit S1 for detecting the breakdown in a throttle controlling system including the throttle valve and a throttle opening degree sensor, a throttle power source interrupting unit S2 for interrupting a power source supply to a throttle actuator in the case where the breakdown in the throttle controlling system is detected, and a predetermined operational condition detecting unit S3 for detecting a shift of the operational condition to a predetermined operational condition corresponding to a fully closed condition of the throttle valve in operation of the throttle power source interrupting unit. A bypass controlling unit S4 opens the bypass valve to feed the air to the engine at the time when the predetermined operational condition is detected in operation of the throttle power source interrupting unit.

Abstract: An exhaust gas recirculation control system for internal combustion engines, comprising an exhaust gas recirculation passage for recirculating a part of an exhaust gas from an internal combustion engine into the engine; an exhaust gas recirculation control valve for controlling a flow rate of the exhaust gas flowing in the exhaust gas recirculation passage; an opening degree controller for controlling an opening degree of the exhaust gas recirculation control valve; an operating condition detector for detecting an operating condition of the engine; means for setting a target exhaust gas recirculation ratio depending on the detected operating condition; a combustion state detector for detecting a combustion state in at least one cylinder of the engine; means for finding an actual exhaust gas recirculation ratio of the engine based on the detected combustion state; and means for controlling the opening degree controller so as to bring the actual exhaust gas recirculation ratio to the target exhaust gas recircul

Abstract: A control apparatus for an internal combustion engine comprises: driving state detecting means for detecting a driving state of the internal combustion engine based on detected information from various sensors; control calculating means for calculating a control parameter of the internal combustion engine in accordance with the driving state; combustion state detecting means for detecting a combustion state amount of at least one of cylinders of the internal combustion engine; fuel property calculating means for calculating a property of a fuel supplied to the internal combustion engine based on the driving state and the combustion state amount; and parameter correcting means for correcting the control parameter in accordance with the fuel property.

Abstract: A fuel injection control apparatus for an internal combustion engine includes an injector control apparatus 120B for controlling a fuel injection amount toward a target fuel injection amount Fm. The injector control apparatus 120B includes an expected engine revolution number calculating means 9 for calculating an expected engine revolution number Nf for a predetermined interval based on the engine revolution number Ne, expected throttle opening degree calculating means 10 for calculating an expected throttle opening degree .theta.f for the predetermined interval based on a throttle opening degree .theta., expected drawn air amount calculating means 11 for calculating an expected drawn air amount Qf for the predetermined interval based on the expected engine revolution number and the expected throttle opening degree, and target fuel injection amount calculating means 12 for calculating a target fuel injection amount Fm.

Abstract: A control device for a cylinder injection internal-combustion engine detects the deterioration of the combustion efficiency of the engine. The control device is equipped with: a fuel injection valve for directly injecting fuel to each cylinder in the internal-combustion engine; an ignition coil unit for driving a spark plug in each cylinder; an electronic control unit for driving each fuel injection valve and ignition coil unit according to the operational state of the internal-combustion engine; combustion state determining means for determining the combustion state of the internal-combustion engine; and combustion efficiency recovering means for recovering the combustion efficiency of the internal-combustion engine.

Abstract: A device for controlling an automatic transmission and an engine for vehicles expanding a range of direct drive to improve fuel efficiency and decreasing the shock due to the transmission of torque at the time of acceleration or deceleration.

Abstract: An engine controller includes various sensors for detecting a degree of throttle opening .theta. and a degree of accelerator opening .alpha. and a control unit 5 for determining the control amount .theta.c of a throttle actuator 1 from operating states, the control unit includes an A/D converter 70 for A/D converting respective degrees of opening at a predetermined resolving power, means 71 for calculating a target degree of throttle opening .theta.1 at a resolving power higher than the predetermined resolving power, means 72 for calculating a target degree of throttle opening .theta.2 at the predetermined resolving power in accordance with the target degree of throttle opening .theta.1 and means 73 for calculating a control amount in accordance with the target degree of throttle opening .theta.2, the target degree of throttle opening .theta.

Abstract: A cylinder injection fuel control device for an internal-combustion engine provides a proper amount of fuel at the time of transient operation by reflecting the most up-to-date operational state in control. The cylinder injection fuel control device has a fuel injection valve for directly injecting fuel into each cylinder of an internal-combustion engine and it supplies the amount of fuel required for a single stroke of each cylinder by applying, to each fuel injection valve, an injection signal of a pulse width corresponding to the driving time of each fuel injection valve; wherein the injection signal applied in a single stroke of each cylinder is divided into three pulses, and the amount of fuel required for a single stroke is divided into three portions.

Abstract: A dual-sensor type air-fuel ratio control system for an internal combustion engine. A catalytic converter 10 is disposed in an exhaust pipe 9, together with a first upstream air-fuel ratio sensor 11 and a second, downstream air-fuel ratio sensor 12. An electronic unit 30A controls the air-fuel ratio of a mixture supplied to the engine, and includes first and second arithmetic circuits 51, 52 for determining first and second air-fuel ratio control quantities Cf1, C2' on the basis of the first and second air-fuel ratio signals V1, V2, and a circuit 53, 54 for correcting the first control quantity with the second one to determine a target air-fuel ratio control quantity J for the fuel injection. A filter 50 is provided for the first air-fuel ratio signal to compensate for variations in the output characteristic of the first sensor.

Abstract: A deterioration detecting apparatus for catalytic converter is provided to surely detect deterioration of a catalytic converter. In the deterioration detecting apparatus for catalytic converter, an electronic control unit decides whether or not a catalyst is activated in the catalytic converter for removing injurious ingredients from an exhaust gas of an engine, and the electronic control unit decides the deterioration of the catalyst only when it decides that the catalyst is activated. It is thereby possible to avoid erroneous decision of the deterioration since the deterioration of the catalyst is not decided when the catalytic converter is not activated.