31results about How to "Improve exhaust emissions" patented technology

Torque demand is coordinated in a vehicle. Information defining at least one torque production limitation for a first torque producing device is received. A request for torque is compared with the first torque producing device torque production limitation. If the comparison does not result in the request for torque exceeding a limitation, a first coordinated torque request is determined as the request for torque and a null torque is determined as a second coordinated torque request. Otherwise, a first excess requested torque is determined as the difference between the request for torque and the exceeded limitation, the first coordinated torque request is determined as the exceeded limitation, and the second coordinated torque request is determined as the first excess requested torque.

Methods and systems are provided for mitigating engine pre-ignition based on a feed-forward likelihood of pre-ignition and feedback from a pre-ignition event. In response to an indication of pre-ignition, a cylinder may be enriched while an engine load is limited. The enrichment may be followed by an enleanment to restore exhaust catalyst feed-gas oxygen levels. The mitigating steps may be adjusted based on engine operating conditions, a pre-ignition count, as well as the nature of the pre-ignition.

In an exhaust gas turbocharger for a reciprocating internal combustion engine comprising an exhaust gas turbine in the exhaust line and a compressor in the inlet line of the engine, the exhaust gas turbine has two exhaust gas flow passages, by way of which exhaust gas is fed to the turbine rotor, the ratio of the turbine rotor diameter to the compressor wheel diameter being set by a function, which is dependent on the displacement volume of the internal combustion engine.

A method, comprising during a vehicle engine cold start, opening a first valve coupled between a first container containing an adsorbent and a second container containing an adsorbate, circulating a first fluid through a first conduit coupled to a first heat exchanger located within the first container and a second heat exchanger located outside the first container, and circulating a second fluid through a second conduit coupled to the second heat exchanger. In this way, heat may be generated at the adsorber during a cold start and subsequently transferred to the cooling jacket of the vehicle engine and/or other vehicle compartments, thereby decreasing the warm-up time for the engine.

A secondary air pipe is connected on the upstream side from catalyst in an exhaust pipe, and a secondary air pump is provided at an upstream portion of the secondary air pipe. An opening/closing valve for opening/closing the secondary air pipe is provided on the downstream side from the secondary air pump. A pressure sensor for detecting pressure within pipe is provided between the secondary air pump and the opening/closing valve. An ECU calculates a secondary airflow rate based upon difference pressure between both secondary air supply pressure which is detected by the pressure sensor when the opening/closing valve is opened under such a condition that the secondary air pump is operated, and also, shutoff pressure which is detected by the pressure sensor when the opening/closing valve is closed.

A control system for an internal combustion engine, which is capable of properly controlling both the temperature of an exhaust system and the air-fuel ratio of exhaust gases even when the control range of the air-fuel ratio of a combustion air-fuel mixture is limited, thereby improving the reduction of exhaust emissions. In the control system, a demanded torque-calculating section calculates a demanded torque. A first controller calculates a target equivalent ratio such that a DeNOx catalyst temperature converges to a predetermined target temperature. A second controller calculates three feedback correction values such that an output value from an oxygen concentration sensor converges to a target output value. A third controller calculates a torque fuel injection amount for generating the combustion air-fuel mixture, a post fuel injection amount for supplying unburned fuel to a DeNOx catalyst, etc. based on five values.

An embodiment of this invention discloses a cold-booting auxiliary device for a diesel engine and a control method; because the cold-booting auxiliary method disclosed by this invention adjusts a heating time of a preheating plug according to an actual water temperature, the method disclosed by this invention realizes to adjust the heating time of the preheating plug according to change of an environment temperature and develops heating action at a stating stage and an idling warming-up stage, the temperature of a combustion chamber of an engine is increased, and combustion and tail gas emission of the engine can be improved obviously; simultaneously, an actual temperature and a position of a booting switch are detected so as to control a booting time and a diesel injection quantity of a diesel injection pump advancer, thus, a diesel supply advancing angle of the diesel engine is changed; when a water temperature is low, diesel injection of the diesel engine can be assisted so as to further improve cold-booting performance of the diesel engine; based on an above-mentioned method, the cold-booting auxiliary device disclosed by this invention improves the cold-booting performance of the diesel engine.

Various systems and methods for detecting exhaust reductant injector degradation based on an exhaust NO_x sensor are disclosed. In one example, degradation of the reductant injector is indicated when an actual NO_x sensor output differs from an expected NO_x sensor output by more than a threshold amount under engine off conditions.

A period of time from a point in time at which pilot injection is executed until an equivalence ratio in fuel spray, after exceeding a combustible equivalence ratio, falls below the combustible equivalence ratio is calculated as a physical ignition delay period. A chemical ignition delay period is calculated from the temperature and pressure inside a combustion chamber at a point in time at which the equivalence ratio in the fuel spray reached the combustible equivalence ratio. A total ignition delay period is calculated from the above-calculated ignition delay periods. The oxygen concentration and temperature inside the combustion chamber are adjusted such that the total ignition delay period matches a target ignition delay period.

An air-fuel ratio control apparatus that is applied to an internal combustion engine having an intake passage to which a canister is connected via an evaporative fuel supply passage, and an exhaust passage that is provided with an exhaust gas purifier, includes a first sensor provided upstream of the exhaust gas purifier, a second sensor provided downstream of the exhaust gas purifier, and a controller that corrects a fuel injection amount through feedback on a basis of the air-fuel ratio acquired by the first sensor, modifies a correction coefficient used for feedback correction on a basis of the air-fuel ratio acquired by the second sensor, and has a storage unit that stores the modified correction coefficient. The controller prohibits the modified correction coefficient from being stored into the storage unit if a concentration of fuel in purge gas is equal to or higher than a predetermined criterial concentration.

Submerged combustion methods and systems including a melter equipped with an exhaust passage through the ceiling or the sidewall having an aggregate hydraulic diameter. Submerged combustion burners configured to create turbulent conditions in substantially all of the material being melted, and produce ejected portions of melted material. An exhaust structure including a liquid-cooled exhaust structure defining a liquid-cooled exhaust chamber having a cross-sectional area greater than that of the exhaust stack but less than the melter. The exhaust passage and liquid-cooled exhaust structure configured to maintain temperature and pressure of the exhaust, and exhaust velocity through the exhaust passage and the exhaust structure, at values sufficient to prevent the ejected material portions of melted material from being propelled out of the exhaust structure as solidified material, and maintain any molten materials contacting the first interior surface molten so that it flows down the first interior surface into the melter.

A control apparatus for an internal combustion engine that varies the amount of lift of an intake valve is disclosed. In one embodiment, the control apparatus includes a fuel injection timing correcting device that, when lift of the intake valve is varied, corrects and varies fuel injection termination timing according to the variation of the lift of the intake valve. In another embodiment, an injection quantity correcting device is included that, when lift of the intake valve is varied, corrects and varies an injection quantity. In still another embodiment, a swirl flow generating device is included that generates a swirl flow in the cylinder. In a further embodiment, an intake valve closing timing correcting device is included that, when lift of the intake valve is varied, controls the variable valve timing mechanism so that the valve closing timing of the intake valve remains substantially constant.

Methods and systems are provided for cleaning out condensate stored at a charge air cooler. In response to increased condensate accumulation at a charge air cooler, airflow through the engine is increased to purge the condensate while an engine actuator is adjusted to maintain engine torque. Combustion stability issues of engine cylinders are addressed by adjusting fueling of each cylinder individually during condensate ingestion.

Systems and methods for operating an engine that includes an oxygen sensor and one or more fuel injectors for each engine cylinder are described. In one example, lines describing a relationship between a fuel mass multiplier and a coefficient of a function describing output of an oxygen sensor to a step change in fuel mass are a basis for determining air-fuel imbalance of engine cylinders.

The invention relates to a control device and a control method for internal combustion engine. The objective of this invention is to provide a technology for improving exhaust emissions at engine startup without reducing the performance of the catalyst at engine startup. This invention is equipped with a catalyst which is provided in the exhaust passage of an internal combustion engine capable of using multiple types of fuels and which adsorbs and purifies the exhaust component discharged from the internal combustion engine. When there is a request to stop the internal combustion engine and, of the multiple fuel types, a first fuel the unburned component of which is easily adsorbed by the catalyst is being used, a switch is made from the first fuel to a second fuel, and running continues until the internal combustion engine stops.

Disclosed is a secondary battery having a structure in which a jelly-roll having a cathode/separator/anode structure is mounted in a cylindrical battery case, wherein a plate-shaped insulator mounted on the top of the jelly-roll includes a woven fabric or a knit fabric made of fibers.

The invention provides a fuel control device and a control method for a manifold injection type gasoline engine. The control device is provided with an internal combustion mechanism, a gas inlet pipeline, a gas exhaust pipeline, a throttle valve, a gas inlet manifold, a gasoline injector, at least one air cylinder, an air-fuel ratio sensor and a controller, wherein the gas inlet pipeline and the gas exhaust pipeline are connected with the internal combustion mechanism; the throttle valve is configured downstream of the gas inlet pipeline; the gas inlet manifold is configured downstream of thethrottle valve; the gasoline injector is used for injecting gasoline into the gas inlet manifold; the at least one air cylinder is provided with a gas inlet valve and a gas exhaust valve; the air-fuelratio sensor is configured downstream of the gas exhaust pipeline; and the controller is used for comparing the actually measured air-fuel ratio data which are measured by the air-fuel ratio sensor with the recorded transient air-fuel ratio data of the working condition which are stored in an ECU (Electronic Control Unit), regulating an air-fuel ratio target value to be a value which fluctuates within a specified amplitude when a comparison result exceeds the specified range, and correcting a fuel compensating parameter in real time according to the waveform of the actually measured air-fuelratio data after regulation. According to the fuel control device and the control method for the manifold injection type gasoline engine, the fuel compensating parameter can be regulated in real time.

Disclosed is a secondary battery having a structure in which a jelly-roll having a cathode/separator/anode structure is mounted in a cylindrical battery case and a plate-shaped insulator is mounted on top of the jelly-roll, wherein the insulator has a porous structure in which a plurality of fine pores communicate in a longitudinal direction, or in traverse and longitudinal directions.