Intake and exhaust device for automotive engine
AssigneeMazda Motor Corporation
InventorsHidesaku Ebesu, Kouichi Shimizu, Ryotaro Nishida
Life of this patent
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Abstract
Substances in external EGR gas are smoothly guided to a combustion chamber. An intake passage includes: a main intake passage including intake ports and communicating with a combustion chamber and having a supercharger interposed in the main intake passage; and a bypass passage branching off from the main intake passage upstream of the supercharger, and connected downstream of the supercharger; a flow rage adjustment valve changing a cross-sectional flow area of the bypass passage. The bypass passage is provided above the main intake passage, and includes an upper passage to which an EGR passage is connected.
Claims6
An intake and exhaust device for an automotive engine including a plurality of cylinders arranged in line, each of the cylinders provided with a combustion chamber, the device comprising:
- an intake passage and an exhaust passage connected to the combustion chamber of the automotive engine;
- and
- an EGR (exhaust gas recirculation) passage branching off from the exhaust passage and having a downstream end connected to the intake passage, wherein
- the intake passage includes:
- a first intake passage including an intake port communicating with the combustion chamber and having a supercharger interposed in the first intake passage;
- and
- a second intake passage branching off, from the first intake passage, upstream of the supercharger, and bypassing the supercharger to communicate with the combustion chamber,
- the first intake passage including a downstream passage having the intake port, and being connected through the intake port with the combustion chamber;
- and a surge tank having an upstream end of the downstream passage connected thereto,
- the second intake passage includes:
- a relay passage branching off from the first intake passage and extending above the automotive engine;
- and
- an upper passage extending from an upper end of the relay passage toward the surge tank and bypassing the supercharger,
- the upper passage being provided above the first intake passage,
- the upper passage branches off into two, and the two branching passages are spaced apart from each other along the cylinder bank,
- the upper passage further has a downstream end of each of the branching passages connected to an upper surface of the surge tank, and is positioned above the intake port, and
- the EGR passage is connected to the upper passage.
An intake and exhaust device for an automotive engine including a plurality of cylinders arranged in line, each of the cylinder provided with a combustion chamber, the device comprising:
- an intake passage and an exhaust passage connected to the combustion chamber of the automotive engine;
- and
- an EGR (exhaust gas recirculation) passage branching off from the exhaust passage and having a downstream end connected to the intake passage, wherein
- the intake passage includes:
- a downstream passage having the intake port, and being connected through the intake port with the combustion chamber;
- and a surge tank having an upstream end of the downstream passage connected thereto;
- and
- an upper passage provided above an upstream end of an intake port communicating with the combustion chamber,
- the upper passage branches off into two, and the two branching passages are spaced apart from each other along the cylinder bank,
- the upper passage further has a downstream end of each of the branching passages connected to an upper surface of the surge tank, and is positioned above the intake port, and
- the EGR passage is connected to the upper passage.
Dependencies are inferred from the claim text.