Abstract: An engine control device for controlling an air-fuel ratio of an engine, wherein an air-fuel ratio is set at 24 when an output torque of the engine is not more than a first point. It is changed from the value of 24 toward a stoichiometric ratio in accordance with a magnitude of the output torque when the output torque of the engine is in a range of from the first point to a second point and it is set at the stoichiometric ratio (14.7) when the output torque of the engine is more than the second point.

Abstract: A fuel injection control method controls the air-fuel ratio of the air-fuel mixture to be supplied to an internal-combustion engine provided in its exhaust system with an NOx reducing catalytic converter so that the NOx reducing catalytic converter is able to give full play to its ability. A first air-fuel mixture of a stoichiometric or a fuel-rich air-fuel ratio and a second air-fuel mixture of a lean-fuel air-fuel ratio are supplied alternately for predetermined time intervals respectively.

Abstract: A control apparatus of an internal combustion engine has: an air flow amount determining unit for determining a request intake air flow amount corresponding to a target output of an engine; a fuel flow amount determining unit for determining a request fuel flow amount to be supplied to the engine; an intake air amount limiting unit for outputting a predetermined limit value as an intake gas total amount value when the determined request intake air flow amount exceeds the predetermined limit value under a predetermined control condition; and a correcting unit for correcting the value of the request fuel flow amount so that the engine generates the target output on the basis of the request intake air flow amount and the limit intake air flow amount when the intake air amount of the engine is limited.

Abstract: In a multi-cylinder engine, amounts of fuel injection supplied to respective cylinders are individually corrected on the basis of a signal from A/F sensors in the number less than the number of cylinders of the engine, for example, one A/F sensor, so that the air/fuel ratios for respective cylinders are feedback-controlled at a substantially uniform predetermined air/fuel ratio. Therefore, it is possible to perform precise air/fuel ratio control so as to accurately maintain the air/fuel ratio of the engine at the stoichiometric air/fuel ratio, to reduce the concentrations of HC, CO, and NOx in exhaust gas.

Abstract: An engine control method and apparatus wherein a combustion state in each cylinder of an internal combustion engine is detected based on the fluctuation the rotating angular speed of an engine. A correction control is performed to make the combustion states in each of the cylinders uniform, followed by the base value for the purpose of correction control is obtained when the fluctuation in the rotating angular speed is small.

Abstract: An apparatus for purifying an exhaust gas emitted from an internal combustion engine, particularly, immediately after starting of the engine, includes a mechanism for reducing the time required to heat a catalyst converter to the activation temperature. The exhaust gas is passed through a preliminary catalyst close to the engine and then through a main catalyst downstream of the catalyst. The engine is operated with an air-fuel mixture which is richer than the amount indicated by the stoichiometric air/fuel ratio for a period of time from when engine is started until the main catalyst is heated to a temperature at which the catalyst can sufficiently perform its purifying capability. The preliminary catalyst is enabled to function at lower temperatures by combusting the exhaust gas which is generated during a rich air-fuel mixture condition. The main catalyst can be heated with the generated combustion heat, resulting in an enhancement in exhaust gas purifying capability.

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 in the initial period of time from starting of an engine until the catalyst becomes active. Temperature control is made in such a manner that the unburnt hydrocarbons which are adsorbed by the adsorbent begins to be desorbed therefrom substantially simultaneously with the time when the catalyst begins to function.

Abstract: A catalyzer control apparatus for purifying exhaust gas from an internal combustion engine has an electrically heated catalyzer that is heated by a battery which battery is isolated from the conventionally provided engine battery. The temperature of the catalyzer is detected by a sensor and a control circuit located with an engine control unit selectively applies power to heat the catalyzer. The catalyzer is arranged to be pre-heated prior to engine start and by isolating the battery for heating the catalyzer from the normally provided engine battery so, because the catalyzer takes a great power, engine starting is enhanced by virtue of having separate batteries.

Abstract: A control device for an internal combustion engine capable of conducting lean burn control, such as exhaust gas emission control, always optimally regardless of a timewise change of the internal combustion engine, variations in engines, and an environmental change. The control device includes a detector for detecting a burn condition of the internal combustion engine, a lean limit air-fuel ratio factor map, a lean burn feedback logic, an oxygen concentration sensor, and a feedback control logic for controlling an air-fuel ratio to a theoretical air-fuel ratio, wherein lean burn is performed at the middle point between the lean limit air-fuel ratio and the theoretical air-fuel ratio.

Abstract: A catalyst heating control device for cleaning automotive engine exhaust gases, comprising a generator, at least one battery, a catalyst heating control apparatus, a battery charging device and an electronic fuel injector. Before starting the engine, the catalyst is preheated. At the start of the engine, the catalyst preheat control is curtailed according to the state of the batteries. The catalyst current control is performed by detecting the catalyst activation temperature. The catalyst is heated usually to about 350.degree. C., at which point the current supply for heating is terminated.

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 in the initial period of time from starting of an engine until the catalyst becomes active. Temperature control is made in such a manner that the unburnt hydrocarbons which are adsorbed by the adsorbent begins to be desorbed therefrom substantially simultaneously with the time when the catalyst begins to function.

Abstract: A control system for controlling the full current of a generator for a vehicle having an internal combustion engine operates to control the field current so as to change the output power of the generator. A storage unit is charged by the generator; a field current control unit for controlling the field current of the generator detects the output generated by the storage unit; and an engine control unit to which operation parameters of the internal combustion engine are applied controls at least one of a fuel supply and an ignition timing for the internal combustion engine. The engine control unit further operates to determine a kind of change of load being applied to the internal combustion engine when the load has changed and to control the field current of the generator in accordance with a predetermined control pattern corresponding to the kind of change of the load.

Abstract: An altitude decision system and engine operating parameter control system using the same for accurately detecting and correcting for altitude uses three signals, viz, the signal from an engine revolution number sensor, the signal from a throttle sensor for detecting the angle of opening of a throttle valve, and a fundamental fuel injection pulse width signal which is computed by engine operational parameter-computer from inputted signals from a mass air flow sensor and the revolution number detection sensor. Having accurately derived the altitude, the fuel injection pulse rate, the intake air flow and the ignition timing are corrected.

Abstract: A method and a controller for supplying a fuel to a plurality of cylinders of an internal combustion engine, in which engine operation conditions including the operating temperature of the engine are detected by various sensors attached to the engine and by using a microcomputer, and the fuel is successively supplied by being injected to the engine cylinders based on the detected engine operation conditions. The timing of fuel injection into each of the plurality of cylinders is shifted from an exhaust stroke period to a suction stroke period according to the operating temperature of the engine among the detected engine operation conditions.

Abstract: In a multi-cylinder engine control method and a control apparatus therefor, rotating speeds of the multi-cylinder engine at explosion strokes of the respective cylinders are detected for estimating combustion pressures in the respective cylinders, and deviations of the combustion pressures in the cylinders are derived from the estimated combustion pressures in the respective cylinders, so that ignition timings or fuel amounts supplied to the respective cylinders are regulated in response to the derived deviations of the combustion pressures.

Abstract: With regard to the engine control method which determines control variables for the individual cylinders of a multicylinder internal combustion engine independently of one another, this specification discloses improved control method and apparatus whereby the optimum control variables are determined. The control method of a multicylinder internal combustion engine according to this invention includes a step of detecting data representing the operating condition of the engine, a step of storing data, a step of determining a first control variable at a certain time of a certain stroke of each cylinder according to the stored data, and a step of determining a second control variable at a later time in the stroke according to the same stored data.

Abstract: A car control apparatus in which correction characteristics indicating whether or not various control constants are proper or not are calculated through loop control of one of the car's operation parameters, such as the air-fuel ratio, on the basis of the air-fuel ratio correction factors subjected to learning to thereby rationalize the control constants such as the fundamental injection time so as to realize proper fuel injection and proper ignition timing control.

Abstract: An electronic control system for an internal combustion engine includes a plurality of first sensors for measuring a drive action taken in accordance with a driver's intent, a plurality of second sensors for measuring operating conditions of an engine, a plurality of actuators for controlling the engine, a unit for setting a target reference by selecting one among a plurality of target references for engine control, and a unit for manipulating the actuators responsive to the established target reference to control the engine.

Abstract: A basic fuel injection pulse width value indicating an individual performance of an injector and an intake air flow amount value indicating an individual performance of an air flow sensor are prepared so as to memorize in plural memory areas in a store table, respectively. Deviations due to the basic fuel injection pulse width and deviations due to the intake air flow amount are memorized in the memory areas as learning values for controlling an air-fuel ratio, respectively. A corrected fuel injection pulse width is requested under the memorized learning values. An estimation learning is carried out at a first time learning. A first time learning value of the basic fuel injection pulse width is memorized in a whole area of the store table, and a first time learning value of the intake air flow amount is memorized in a corresponding area of the store table.

Abstract: A method and a controller for supplying a fuel to a plurality of cylinders of an internal combustion engine, in which engine operation conditions including the operating temperature of the engine are detected by various sensors attached to the engine and by using a microcomputer, and the fuel is successively supplied by being injected to the engine cylinders based on the detected engine operation conditions. The timing of fuel injection into each of the plurality of cylinders is . .shifted from an exhaust stroke period to a suction stroke period according to the operating temperature of the engine among the detected engine operation conditions.!. .Iadd.set in a suction stroke period at the time of the engine starting in a low temperature condition, and is shifted to an exhaust stroke period as the level of the engine temperature rises.Iaddend..