Topic
Secondary air injection
About: Secondary air injection is a research topic. Over the lifetime, 11452 publications have been published within this topic receiving 112147 citations.
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Patent•
19 Nov 2004TL;DR: In this paper, the Miller cycle was used to control the timing of valve closing/opening and use of an air supply system to enable engine operation according to a Miller cycle, and the use of air supply systems to reduce certain emission components of the exhaust.
Abstract: Engines and methods of controlling an engine may include producing ammonia from exhaust gas and using the ammonia to reduce certain emission components of the exhaust. Timing of valve closing/opening and use of an air supply system may enable engine operation according to a Miller cycle.
29 citations
Patent•
03 Feb 2004TL;DR: In this paper, an exhaust gas temperature estimating unit sequentially estimates the temperature of exhaust gas flowing through the exhaust passage, using at least a parameter representative of an operating state of the internal combustion engine.
Abstract: An apparatus controls the temperature of an exhaust gas sensor disposed in an exhaust passage of an internal combustion engine. An exhaust gas temperature estimating unit sequentially estimates the temperature of exhaust gas flowing through the exhaust passage, using at least a parameter representative of an operating state of the internal combustion engine. A heater control unit controls a heater for heating an active element of the exhaust gas sensor to a predetermined target temperature, using an estimated value of the exhaust gas from the exhaust gas temperature estimating unit.
29 citations
Patent•
01 May 1979
TL;DR: In this article, an air fuel ratio management system having a calibration correction for the pressure differentials between the exhaust and intake manifolds of the engine is disclosed, which corrects the air/fuel ratio of the system for the variable internal exhaust gas recirculation occasioned by changing restrictions to flow found in the intake and exhaust manifolds.
Abstract: An air fuel ratio management system having a calibration correction for the pressure differentials between the exhaust and intake manifolds of the engine is disclosed. The differential calibration corrects the air/fuel ratio of the system for the variable internal exhaust gas recirculation occasioned by changing restrictions to flow found in the intake and exhaust manifolds. In one implementation a differential pressure sensor communicates with both the intake and exhaust manifolds to develop a differential pressure signal. The differential pressure signal is thereafter applied to a function circuit which generates a pressure correction signal. An electronic control unit receives the pressure correction signal and utilizes it to modify the air/fuel ratio calibration according to the functional conversion. In the preferred embodiment the function circuit comprises a voltage controlled linear current source. In another implementation individual pressure sensors are used for each manifold to generate signals to a difference circuit which subtracts the intake manifold absolute pressure from the exhaust manifold absolute pressure to form the differential pressure signal. In either implementation incremental or proportional modification of a variable duration fuel pulse from the electronic control unit can be obtained by the pressure correction signal.
29 citations
Patent•
29 Jun 2015TL;DR: An airflow control system for a gas turbine system according to an embodiment includes: a compressor component of a GTL, a mixing area for receiving an exhaust gas stream produced by the GTL system, an air extraction system for extracting a supply of bypass air from an excess flow of air generated by the compressor component as mentioned in this paper.
Abstract: An airflow control system for a gas turbine system according to an embodiment includes: a compressor component of a gas turbine system; a mixing area for receiving an exhaust gas stream produced by the gas turbine system; an air extraction system for extracting a supply of bypass air from an excess flow of air generated by the compressor component of the gas turbine system; an enclosure surrounding the gas turbine system and forming an air passage, the bypass air flowing through the air passage and around the gas turbine system into the mixing area to reduce a temperature of the exhaust gas stream; and an exhaust processing system for processing the reduced temperature exhaust gas stream.
29 citations
Patent•
17 Mar 1997
TL;DR: In this article, a structure of an exhaust port in an internal combustion engine is provided, which is capable of increasing the flow in the exhaust port by regulating the flow of exhausted gases produced around a valve stem.
Abstract: A structure of an exhaust port (2) in an internal combustion engine is provided, which is capable of increasing the flow in the exhaust port (2) by regulating the flow of exhausted gases produced around a valve stem (4a). In the exhaust port (2) formed in a cylinder head (1), which has therein a boss (7) inserted with a valve guide (5) supporting a valve stem (4a) of an exhaust valve (4), a projection (3) is extended from the boss (7) of the valve guide (5) toward an opening port (P) and projects into the exhaust port (2). The projection (3) is provided on an exhaust-port wall (2a) opposite of an exhaust exit-port (E) about the valve stem (4a).
29 citations