Abstract: A catalyst for internal combustion engine exhaust purification without frequently switching to a rich burn mode. The catalyst includes a catalyst A containing an NOx absorbing substance and an NOx reducing catalyst, a catalyst B containing a hydrogen adsorption substance and a hydrogen oxidizing catalyst, an electron conductive substance C, and an ion conductive substance D. Electrons move between the catalyst A and the catalyst B through the electron conductive substance C, ions move through the ion conductive substance D, and an electrochemical reducing reaction and an electrochemical oxidizing reaction respectively occur on the catalyst A and on the catalyst B. Therefore, it is possible to quickly reduce the adsorbed NOx using the adsorbed hydrogen without depending on the atmosphere.

Abstract: A device for purifying exhaust gas of an internal combustion engine which provides improved purifying efficiency even in a lean operating condition without deteriorating the fuel efficiency. The device includes an electrochemical catalyst 5 installed in the exhaust system 3 of the internal combustion engine 1, the electro chemical catalyst 5 containing an electron conducting substance and an ion conducting substance, the oxidizing reaction and the reducing reaction being promoted by the conduction of ions and electrons, thereby to electrochemically purify the exhaust gas G in the exhaust system.

Abstract: In order to suppress the quantity of the nitrogen oxide to be released to the atmosphere when the operation state is shifted from the engine operation with lean air fuel ratio to that with stoichiometric air fuel ratio, the exhaust gas purification apparatus is arranged such that by forced rich operation, when the operation state is shifted from the engine operation with lean air fuel ratio to that with stoichiometric air fuel ratio, the operation state is shifted to the engine operation with stoichiometric air fuel ratio after performing that with rich air fuel ratio.

Abstract: A device for controlling an internal combustion engine capable of estimating the amount of NOx emission within short periods of time maintaining high precision and realizing improved control performance without increasing the cost as a result of not using map data in the ROM. The device includes NOx operation circuit for estimating the amount of NOx in the exhaust gas from a theoretical formula and an empirical formula based upon the intake air amount Qa, intake air temperature To, pressure Pb, air-fuel ratio &lgr; and EGR rate &bgr;, and control circuit for controlling at least either the NOx purifying catalyst or the combustion state in the internal combustion engine in order to lower the amount of NOx emission.

Abstract: An air/fuel ratio correction cylinder determining section 25 specifies, based on the peak phase, a cylinder for which an air/fuel ratio is to be corrected. A cylinder-specific air/fuel ratio correcting section in the form of respective cylinder correcting sections 31 through 34 corrects an amount of fuel to be supplied to a cylinder which becomes an air/fuel ratio correction target. A cylinder for which an air/fuel ratio deviates from the remaining cylinders is specified as a fuel amount correction target based on a change in the output value of the air/fuel ratio sensor.

Abstract: A device for controlling an internal combustion engine capable of estimating the amount of NOx emission within short periods of time maintaining high precision and realizing improved control performance without increasing the cost as a result of not using map data in the ROM. The device includes NOx operation means 34A for estimating the amount of NOx in the exhaust gas from a theoretical formula and an empirical formula based upon the intake air amount Qa, intake air temperature To, pressure Pb, air-fuel ratio &lgr; and EGR rate &bgr;, and control means for controlling at least either the NOx purifying catalyst 17 or the combustion state in the internal combustion engine in order to lower the amount of NOx emission.

Abstract: An air/fuel ratio control apparatus for an internal combustion engine is capable of making the air/fuel ratios of respective cylinders uniform with high accuracy without causing an increase in the load of arithmetic operations of a CPU, while avoiding the influence of a change in an engine operating state, etc. An air/fuel ratio detection period setting section 22 sets an air/fuel ratio detection period T in which all the exhaust strokes of respective cylinders of the engine are included. A peak phase detecting section 21 takes in an output value &lgr; of an air/fuel ratio sensor 8 for an air/fuel ratio detection period, and detects a peak phase P&lgr; which becomes a maximum on a rich side or a lean side owing to a change in the air/fuel ratio. An air/fuel ratio correction cylinder determining section 25 specifies, based on the peak phase, a cylinder for which an air/fuel ratio is to be corrected.

Abstract: A device for purifying exhaust gas of an internal combustion engine featuring improved purifying efficiency even in a lean operating condition without deteriorating the fuel efficiency. The device comprises an electrochemical catalyst 5 installed in the exhaust system 3 of the internal combustion engine 1, the electrochemical catalyst 5 containing an electron conducting substance and an ion conducting substance, the oxidizing reaction and the reducing reaction being promoted by the conduction of ions and electrons, thereby to electrochemically purify the exhaust gas G in the exhaust system.

Abstract: In order to suppress the quantity of the nitrogen oxide to be released to the atmosphere when the operation state is shifted from the engine operation with lean air fuel ratio to that with stoichiometric air fuel ratio, the exhaust gas purification apparatus is arranged such that by means of the forced rich operation means, when the operation state is shifted from the engine operation with lean air fuel ratio to that with stoichiometric air fuel ratio, the operation state is shifted to the engine operation with stoichiometric air fuel ratio after performing that with rich air fuel ratio.

Abstract: An exhaust gas purifier for an internal combustion engine which is capable of detecting the deterioration degree of an NOx catalyst making use of a time elapsed from the time when the air-fuel ratio of exhaust gas flowing into an NOx absorber catalyst is made rich to the time when the air-fuel ratio of exhaust gas flowing out from the NOx absorber catalyst becomes rich. When the time required for a change in the output level of an air-fuel ratio sensor is shorter than a predetermined time, the time required for the change in the output level of the air-fuel ratio sensor is lengthened by reducing the rich degree at the time of rich operation, thereby judging the deterioration degree of the NOx absorber catalyst with accuracy.

Abstract: An exhaust gas purifier for an internal combustion engine which is capable of detecting the deterioration degree of an NOx catalyst making use of a time elapsed from the time when the air-fuel ratio of exhaust gas flowing into an NOx absorber catalyst is made rich to the time when the air-fuel ratio of exhaust gas flowing out from the NOx absorber catalyst becomes rich.

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 method for deciding the combustion state of each cylinder on the basis of an ion current signal generated between gaps of an ignition plug in an internal combustion engine, and a fuel control system which reduces a fuel injection quantity while suppressing the combustion change of each cylinder and reduces a non-combustion composition in an engine exhaust gas after starting of engine.

Abstract: A method for deciding the combustion state of each cylinder on the basis of an ion current signal generated between gaps of an ignition plug in an internal combustion engine, and a fuel control system which reduces a fuel injection quantity while suppressing the combustion change of each cylinder and reduces a non-combustion composition in an engine exhaust gas after starting of engine.

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 method for deciding the combustion state of each cylinder on the basis of an ion current signal generated between gaps of an ignition plug in an internal combustion engine, and a fuel control system which reduces a fuel injection quantity while suppressing the combustion change of each cylinder and reduces a non-combustion composition in an engine exhaust gas after starting of engine.

Abstract: A combustion control system includes a waveform shaping device for producing an ON signal from an ion current detected value, a down timing detecting device for detecting down timings of the ON signal, an operating device for converting the down timings into times elapsing from a reference crank angle, mask time section setting device for setting a mask time section corresponding to a combustion period in accordance with a running condition of the internal combustion engine, a selecting device for selecting at least one of said down times detected within the mask section, and a determining device for determining a combustion parameter of said internal combustion engine in accordance with the combustion ending time, whereby the combustion state of each cylinder is detected from the combustion ending time detected by the mask time section to determine the combustion parameter so as to suppress a combustion change.

Abstract: An automobile clutch control device comprises a target revolving speed generator 1 for generating a target revolving speed N.sub.r of an engine, a revolving speed detector 9 for detecting a revolving speed of the engine, a revolving speed error calculating unit 2 for calculating a target revolving speed error E.sub.r between the target revolving speed N.sub.r and the detected revolving speed N.sub.s, a first controller 11a for outputting a clutch drive signal U3 which corresponds to the calculated target revolving speed error E.sub.r, a revolving speed compensator 11b for outputting an engine revolving speed compensation signal U4, and an adder 11c for adding the clutch drive signal U3 and the revolving speed compensation signal U4 and outputting a target clutch drive signal U. The clutch 12 is controlled based on the output of the adder 11c.

Abstract: In an apparatus for controlling the introduction of air into an exhaust pipe of an internal combustion engine in which air is introduced from the intake side to the exhaust side to improve the efficiency of purifying exhaust gases, to prevent a decline in the purification efficiency of a catalyst in a state in which the exhaust gas temperature immediately after starting is low. A control valve 11 is provided in an air introducing pipe 9 for introducing air from the intake side to the exhaust side, and the control valve 11 is set in a shut-off state during starting or during starting and a predetermined time duration immediately after starting.