Abstract: In a control apparatus for use in an internal combustion engine which has an exhaust gas sensor adapted to detect exhaust gas components and provide an output deliver to an air-fuel ratio of mixture and which performs stratified charge combustion, signals for controlling the air-fuel ratio of mixture and the fuel injection timing are generated on the basis of the output of the exhaust gas sensor. When an optimal air-fuel ratio responsible for combustion stability is changed as a result of execution of EGR and evaporative fuel purging, a change of the air-fuel ratio is determined by using the output of the exhaust gas sensor. When the influence of the EGR or the evaporative fuel purging upon the air-fuel ratio is great, the air-fuel ratio is corrected and the fuel injection timing or the ignition timing is corrected.

Abstract: An engine control device provided with a lean NOx catalyst comprises means for estimating a condition of the lean NOx catalyst, means for performing reactivation control of the lean NOx catalyst based on the result, and means for controlling the termination of the reactivation control. The lean NOx catalyst is constantly made usable in a favorable condition.

Abstract: In a control apparatus for use in an internal combustion engine which has an exhaust gas sensor adapted to detect exhaust gas components and provide an output deliver to an air-fuel ratio of mixture and which performs stratified charge combustion, signals for controlling the air-fuel ratio of mixture and the fuel injection timing are generated on the basis of the output of the exhaust gas sensor. When an optimal air-fuel ratio responsible for combustion stability is changed as a result of execution of EGR and evaporative fuel purging, a change of the air-fuel ratio is determined by using the output of the exhaust gas sensor. When the influence of the EGR or the evaporative fuel purging upon the air-fuel ratio is great, the air-fuel ratio is corrected and the fuel injection timing or the ignition timing is corrected.

Abstract: A control device employing a computer readable program code, for an engine is provided with an electromagnetic actuator controlling opening and closing operation of an intake valve in response to an electric driving signal. The device determines a target A/F based on a signal corresponding to a requested engine output value and a signal representing a driving condition of the engine, determines a requested intake air flow of a cylinder of the engine based on the signal representing a driving condition of the engine and the target A/F, and determines control values for opening and closing operation of an intake valve based on the requested intake air flow and the target A/F. The control values include at least one of a valve opening timing, a valve opening time and a maximum valve lifting amount of the intake valve. Electric driving signals are generated according to the control values.

Abstract: An engine control device provided with a lean NOx catalyst comprises means for estimating a condition of the lean NOx catalyst, means for performing reactivation control of the lean NOx catalyst based on the result, and means for controlling the termination of the reactivation control. The lean NOx catalyst is constantly made usable in a favorable condition.

Abstract: An engine control device provided with a lean NOx catalyst comprises means for estimating a condition of the lean NOx catalyst, means for performing reactivation control of the lean NOx catalyst based on the result, and means for controlling the termination of the reactivation control. The lean NOx catalyst is constantly made usable in a favorable condition.

Abstract: When a pulse width limitation control is carried out, an air-fuel ratio feedback correction control such as O2 feedback or an A/F (air-fuel ratio) learning correction control is prohibited or limited. When the pulse width limitation control is carried out, various kinds of factors for carrying out a basic injection amount are made a prohibition condition or a limitation condition, and when other operation conditions arise, the operability is not damaged.

Abstract: A control apparatus for an engine includes a burn mode determining unit for determining a stoichiometric burn mode or a lean burn mode, and a stratified charge burn mode or a homogeneous charge burn mode. A target A/F calculating unit calculates a target A/F according to the operational point of the engine and a phase lag filter changes the phase of said calculated target A/F. A first target A/F modifying unit modifies the target A/F whose phase is delayed, so that an unstable burn region is avoided and a second target A/F modifying unit further modifies the modified target A/F during a transitional period when the operation is switched so as to avoid the unstable region. A target A/F selecting unit selects one of the modified A/F modified by the first target A/F modifying unit and the target A/F modified by the second A/F modifying unit.

Abstract: A failure diagnosis apparatus for an internal combustion engine having an intake air swirl control valve, includes a broken wire detection unit, a target opening degree/actual opening degree deviation detection unit, an opening degree abnormally detection unit and a target opening degree execution abnormality detection unit. Outputs from these detection units are used to detect a failure of the swirl control valve which becomes a factor for inviting an aggravation of an operability such as a knocking etc.

Abstract: An engine fuel supply apparatus is provided with an accident judging device for effecting accident judgement in a fuel control system under the conditions that the fuel pressure regulator driver is subjected to feedback control of the fuel pressure, and that there is a change in the fuel pressure and the change continues for a predetermined time of period within a set time range.

Abstract: An electronic engine control system for a lean burn engine includes a unit for detecting an amount Qa of intake air fed into a cylinder of the engine, a unit for detecting an engine speed Ne, a unit for calculating a basic fuel injection pulse width TPbas on the basis of the intake air amount Qa and the engine speed Ne, and a unit for determining control parameters containing any of at least an air-fuel ratio, an ignition timing, a fuel injection timing, a throttle opening and an EGR rate in accordance with an operating state of the engine in optimum. A reference TPref having the same dimension as the basic fuel injection pulse width TPbas and which is a function of an accelerator operating amount determined on the basis of the accelerator operating amount is determined as a load parameter used upon determination of the control parameters of the engine in operation with a lean air-fuel ratio. Because the accelerator opening amount is inputted to calculate the reference .sub.

Abstract: A controller of a direct injection engine is basically provided with a swirl control valve arranged in an air intake port portion, a fuel injection valve and a variable fuel pressure regulator, further provided with means for controlling fuel pressure by the variable fuel pressure regulator, means for detecting operational conditions and means for detecting a combustion state, and still further provided with means for controlling a valve opening of the swirl control valve on the basis of the operational conditions and the combustion state.

Abstract: An exhaust gas purifying catalyst is provided for purifying NOx contained in an exhaust gas from an internal combustion engine of a vehicle operated at a high air fuel ratio due to excessive oxygen, using unburnt HC or CO in the exhaust gas as a reducing agent. The catalyst comprises platinum, strontium and a rare earth metal, as active components, each supported on a support of inorganic oxide. The active components of the catalyst include platinum of 0.01-3.7 by wt ratio, strontium of 0.01-55 by wt ratio and a rare earth metal of 0.01-36 wt ratio, per the inorganic oxide of 100 by wt ratio.

Abstract: An engine control device comprising has a processor which receives a variety of operating state detection signals (such as an engine crank angle signal and an accelerator opening signal) and computes control quantities for an interrupt routine on the basis of a predetermined signal such as the engine crank angle signal or a signal generated at fixed basic intervals, in accordance with a predetermined program during a period of time between the predetermined signals. A means is provided for counting and/or limiting the number of times interrupt processing triggered by an activation signal for the routine is executed during the period of time between the predetermined signals whenever processing of the routine exists.

Abstract: An electronic engine control system for a lean burn engine includes a unit for detecting an amount Qa of intake air fed into a cylinder of the engine, a unit for detecting an engine speed Ne, a unit for calculating a basic fuel injection pulse width TPbas on the basis of the intake air amount Qa and the engine speed Ne, and a unit for determining control parameters containing any of at least an air-fuel ratio, an ignition timing, a fuel injection timing, a throttle opening and an EGR rate in accordance with an operating state of the engine in optimum. A reference TPref having the same dimension as the basic fuel injection pulse width TPbas and which is a function of an accelerator operating amount determined on the basis of the accelerator operating amount is determined as a load parameter used upon determination of the control parameters of the engine in operation with a lean air-fuel ratio.

Abstract: In a direct injection internal combustion engine, a stratification combustion condition, a homogeneous combustion condition and an intermediate combustion condition which is intermediate the stratification combustion and the homogeneous combustion conditions are controlled selectively according to an operation condition of at least one selected from a combustion condition, an output condition of the engine and an acceleration condition of a vehicle. Without defeating an intended low fuel consumption operation, the engine operates to obtain a reduction of harmful exhaust gas. As a result, by assuring the low fuel consumption operation, an improvement in combustion stability and smoke reduction can both be realized.

Abstract: A system for purifying an exhaust gas for use in an automobile is disclosed which does not externally discharge unburnt hydrocarbons until a catalyst becomes active. An adsorbent is provided upstream of the catalyst. A heat exchanger is disposed between an upstream portion of the adsorbent and a portion between the adsorbent and the catalyst for controlling the elevation of the temperature of the adsorbent and for promoting the elevation of the temperature of the catalyst. The unburnt hydrocarbons are absorbed by the adsorbent 4 in the initial period of time from starting of an engine until the catalyst 8 becomes active. Temperature control is made in such a manner that the unburnt hydrocarbons which are adsorbed by the adsorbent 4 begins to be desorbed therefrom substantially simultaneously with the time when the catalyst 8 begins to function.

Abstract: Disclosed is an apparatus for controlling the fuel injection quantity for an internal combustion engine. The apparatus includes an operating condition detecting unit for detecting the operating conditions of an internal combustion engine on the basis of the engine speed and the intake air amount or the internal pressure of an intake pipe, a purge control variable calculating unit for calculating the amount of the purge control on the basis of the detected operating conditions, an A/F ratio learning and calculating unit for learning the deviation from the desired A/F ratio control by inputting the effect of the disturbance due to the canister purge and performing the A/F ratio feedback control, a memory unit for storing the deviation learned by the calculating unit, and a fuel injection quantity calculation means unit for determining the fuel injection quantity by the amount of correction based on the result of the learned deviation and the A/F ratio deviation obtained by the A/F ratio control.

Abstract: A cylinder fuel injection engine controller for controlling a cylinder fuel injection engine is capable of controlling the cylinder fuel injection engine for operation at a stable idling speed regardless of the variation of engine speed and load on the cylinder fuel injection engine while the cylinder fuel injection engine is cold and stratified combustion is impossible. The cylinder fuel injection engine controller comprises: a basic fuel injection quantity determining means for determining a basic fuel injection quantity (Tp1), a reference fuel injection quantity determining means for determining a reference fuel injection quantity (Tp2) from an engine speed and an accelerator pedal position; and a target fuel injection quantity calculating means for determining a target fuel injection quantity (Tp3) by multiplying the reference fuel injection quantity (Tp2) by a desired A/F ratio and dividing the product of the multiplication by the stoichiometric A/F ratio.

Abstract: To perform the proper control conforming to the intent of a driver of an automotive vehicle under any condition which is encountered by the vehicle, optimum control methods are preliminarily classified in accordance with categories relating to conditions of the vehicle and categories relating to intents of the driver and the classified optimum control methods are stored in a memory, thereby selecting one of the control methods corresponding to the combination of the categories to which the vehicle condition and the driver's intent detected during the running of the vehicle belong.