A method for an engine control unit to conduct real time updating of data tables based on feedback from the air flow sensor without external computing. The air fuel ratio is based on information received from an air flow meter, where a look-up table is actively tuned for the air flow calibration instead of the volumetric efficiency tables. Here, the look-up table involves a single dimension value so the calculations are simpler than more complex evaluations previously set forth.

The control apparatus for an engine includes: a first controller that sets a valve-opening timing of an intake valve of the engine in response to an amount of intake air; and a second controller that sets an injection start time of a fuel injector of the engine in response to the amount of intake air. In a case where the amount of intake air is within a first range being equal to or more than a predetermined value, the first controller advances the valve-opening timing as compared with a case where the amount of intake air is equal to the predetermined value, and the second controller delays the injection start time as compared with a case where the amount of intake air is within a second range being less than the predetermined value.

The present disclosure relates to internal combustion engines in general. The teachings may be embodied in methods and devices for operating an internal combustion engine having one or more cylinders which are each assigned gas inlet valves. The method may include: in a first operating state, determining a model temperature of a gas in the intake tract cyclically for a present point in time using a predefined intake pipe model without reference to a present temperature measurement value of the gas; determining a cylinder air mass situated in a respective cylinder after closing the gas exchange valves based at least in part on the model temperature determined for the present point in time; and metering fuel into the respective cylinder based at least in part on the determined cylinder air mass. The model temperature for the present point in time depends at least in part on a model temperature determined for a preceding point in time.

Methods and systems are provided for the estimation of an aircharge into a cylinder used to adjust an engine operating parameter, based on a manifold pressure signal stored in a buffer. In one example, a method may include sampling an intake manifold pressure sensor signal at even increments of time, stamping it with its corresponding crank angle and storing it in a buffer. The closest stored signal to the intake valve closing of a cylinder may be used to calculate its aircharge.

An exhaust purification system includes: an NOx reduction type catalyst, which is provided in an exhaust system; and a regeneration treatment unit, which recovers an NOx purification capacity of the NOx reduction type catalyst, wherein the regeneration treatment unit includes: a target setting unit, which sets a target injection amount of at least one of a post injection and an exhaust pipe injection that is required for setting an excess-air-ratio of the exhaust gas to the target excess-air-ratio, based on a suction air amount of the internal combustion engine, the target excess-air-ratio, and a fuel injection amount of the internal combustion engine; and an injection controller, which controls an injection amount of at least one of the post injection and the exhaust pipe injection, based on the target injection amount input from the target setting unit.

Provided is an exhaust purification system including: an NOx occlusion reduction type catalyst (32), a catalyst temperature estimating unit (115), an NOx occlusion amount estimating unit (113), a regeneration control unit (100) that performs catalyst regeneration of bringing an exhaust gas into a rich state to recover NOx occlusion capacity of the NOx occlusion reduction type catalyst (32), an interval setting unit (118) that sets a target interval from the termination of the catalyst regeneration to a start of next catalyst regeneration, a catalyst regeneration start processing unit (110) that starts the next catalyst regeneration when the NOx occlusion amount is equal to or greater than a threshold and an elapsed time from the termination of the catalyst regeneration reaches the target interval, and an interval target value correcting unit (119) that extends and corrects the target interval based on the NOx occlusion amount when the catalyst temperature is lower than a predetermined catalyst activation temperature.

An engine control device includes a determination unit configured to determine whether or not an engine is in a complete explosion state, a calculation unit configured to calculate an integrated intake air amount that is an integrated value of an intake air amount of the engine after an affirmative determination is made by the determination unit, a setting unit configured to set a target equivalent ratio of the engine in accordance with the integrated intake air amount, and a control unit configured to control an intake air amount and a fuel injection amount of the engine such that an equivalent ratio of an air-fuel mixture becomes the target equivalent ratio.

An engine controlling apparatus controls a cylinder injected volume of fuel injected from a cylinder injection valve of an engine into a cylinder, and a port injected volume of fuel injected from a port injection valve into an intake port. The engine controlling apparatus includes an adhesion volume calculator to calculate a cylinder adhesion volume of fuel adhering to the cylinder, the fuel being injected from the cylinder injection valve, and a port adhesion volume of fuel adhering to the intake port, the fuel being injected from the port injection valve. The engine controlling apparatus further includes a controller to control the cylinder injected volume and the port injected volume based on both the cylinder adhesion volume and the port adhesion volume.

A controller for an electronic fuel injection system for an internal combustion engine includes: a plurality of analog-to-digital (A/D) converters; a memory; and a processor communicatively coupled to the A/D converters and the memory. The A/D converters are configured to receive analog electrical signals representing pressures generated by a plurality of pressure sensors disposed at different locations along an air intake path and output corresponding digital signals representing the pressures, one or more of the pressure sensors are disposed in a body of a carburetor rendered permanently inoperable to mix fuel with air flowing in the air intake path, and the processor is configured to receive the digital signals representing the pressures output from the A/D converters and output a mass air flow signal representing a mass air flow rate as to an engine management system to control the electronic fuel injection system based on the received pressure signals.

Methods and systems are provided for determining a cylinder air charge based on a boost manifold volume of an engine. In one example, a method may include inducing a compressor surge event, and updating the boost manifold volume in response to a difference between an actual surge pressure and an expected surge pressure. The method further includes determining the cylinder air charge based on the updated boost manifold volume.