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US 12,571,340 B2Granted
Exhaust system
AssigneeMazda Motor Corporation
InventorsNaoyuki Yamagata, Takamasa Matsumoto, Hiroki Miyawaki
Life of this patent
Estimating the term…
Abstract
An exhaust passage includes a first exhaust passage which is opened and closed by a first exhaust valve, a second exhaust passage through which exhaust gas is caused to flow independently from the first exhaust passage and which is opened and closed by a second exhaust valve, and a third exhaust passage in which the first exhaust passage and the second exhaust passage merge together, and exhaust catalysts include a main exhaust catalyst which is provided in the third exhaust passage and an auxiliary exhaust catalyst which is arranged in the first exhaust passage and has a smaller capacity than the main exhaust catalyst.
Claims18
An exhaust system comprising:
- an exhaust passage through which exhaust gas flows;
- a first exhaust valve and a second exhaust valve;
- each of the first exhaust valve and the second exhaust valve opens and closes a portion between a combustion chamber of an engine and the exhaust passage;
- and
- a plurality of exhaust catalysts provided in the exhaust passage to purify the exhaust gas, wherein
- the exhaust passage includes:
- a first exhaust passage which is opened and closed by the first exhaust valve;
- a second exhaust passage through which the exhaust gas is caused to flow independently from the first exhaust passage, the second exhaust passage being opened and closed by the second exhaust valve;
- and
- a third exhaust passage in which the first exhaust passage and the second exhaust passage merge together,
- the plurality of exhaust catalysts include:
- a main exhaust catalyst provided in the third exhaust passage;
- and
- an auxiliary exhaust catalyst arranged in the first exhaust passage, the auxiliary exhaust catalyst having a smaller capacity than the main exhaust catalyst,
- the exhaust system further comprises:
- a hydraulic lash adjuster which adjusts a flow amount of the exhaust gas from the second exhaust passage to the third exhaust passage, the hydraulic lash adjuster including a valve stopping mechanism for stopping an action of the second exhaust valve;
- and
- a controller having a processor and a memory with a computer readable program stored therein that upon execution of the computer readable program by the processor configures the controller to actuate the hydraulic lash adjuster, and
- when an operation state of the engine belongs to a first operation region in which an engine load is smaller than a predetermined load and an engine speed is lower than a predetermined revolution speed, the controller actuates the hydraulic lash adjuster so as to stop a flow of the exhaust gas from the second exhaust passage to the third exhaust passage.
16 more elements
An exhaust system comprising:
- an exhaust passage through which exhaust gas flows;
- a first exhaust valve and a second exhaust valve;
- each of the first exhaust valve and the second exhaust valve opens and closes a portion between a combustion chamber of an engine and the exhaust passage;
- a plurality of exhaust catalysts provided in the exhaust passage to purify the exhaust gas;
- and
- a turbocharger having a turbine arranged in a turbine housing,
- wherein
- the exhaust passage includes:
- a first exhaust passage which is opened and closed by the first exhaust valve and the first exhaust passage is connected to the turbocharger;
- a second exhaust passage through which the exhaust gas is caused to flow independently from the first exhaust passage, the second exhaust passage being opened and closed by the second exhaust valve, the second exhaust passage being connected to the turbocharger;
- and
- a third exhaust passage in which the first exhaust passage and the second exhaust passage merge together and the third exhaust passage is connected to the turbocharger,
- the plurality of exhaust catalysts include:
- a main exhaust catalyst provided in the third exhaust passage;
- and
- an auxiliary exhaust catalyst arranged in the first exhaust passage, the auxiliary exhaust catalyst having a smaller capacity than the main exhaust catalyst, and
- the turbine housing is arranged in a portion in the third exhaust passage on an upstream side relative to the main exhaust catalyst,
- the exhaust system further comprises:
- a controller having a processor and a memory with a computer readable program stored therein that upon execution of the computer readable program by the processor configures the controller to actuate the first exhaust valve and the second exhaust valve, and
- when an operation state of the engine belongs to a second operation region in which an engine load is equal to or greater than a predetermined load and an engine speed is equal to or higher than a predetermined revolution speed, the controller retards a valve opening time of the first exhaust valve relatively to a valve opening time of the second exhaust valve.
17 more elements
An exhaust system comprising:
- an exhaust passage through which exhaust gas flows;
- a first exhaust valve and a second exhaust valve;
- each of the first exhaust valve and the second exhaust valve opens and closes a portion between a combustion chamber of an engine and the exhaust passage;
- a plurality of exhaust catalysts provided in the exhaust passage to purify the exhaust gas;
- a hydraulic lash adjuster which adjusts a flow amount of the exhaust gas from the second exhaust passage to the third exhaust passage, the hydraulic lash adjuster including a valve stopping mechanism for stopping an action of the second exhaust valve;
- and
- a controller having a processor and a memory with a computer readable program stored therein that upon execution of the computer readable program by the processor configures the controller to actuate the hydraulic lash adjuster, wherein
- the exhaust passage includes:
- a first exhaust passage which is opened and closed by the first exhaust valve;
- a second exhaust passage through which the exhaust gas is caused to flow independently from the first exhaust passage, the second exhaust passage being opened and closed by the second exhaust valve;
- and
- a third exhaust passage in which the first exhaust passage and the second exhaust passage merge together, and
- the plurality of exhaust catalysts include:
- a main exhaust catalyst provided in the third exhaust passage;
- and
- an auxiliary exhaust catalyst arranged in the first exhaust passage, the auxiliary exhaust catalyst having a smaller capacity than the main exhaust catalyst.
13 more elements
Dependencies are inferred from the claim text.