Title:
多気筒エンジンの排気装置
Document Type and Number:
Japanese Patent JP5472050
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an intake and exhaust device of a multi-cylinder engine capable of increasing an engine output with a simple structure.SOLUTION: The exhaust device includes: an independent exhaust passage 52 connected to an exhaust port 18 and split into a low-speed-side passage 54 and a high-speed-side passage 53; a low-speed-side manifold part 56a and a high-speed side manifold part 57 connected to the low-speed-side passage 54 and the high-speed-side passage 53; and a flow channel area variable valve 58 opening and closing the high-speed-side passage 53. The low-speed-side passage 54 and the low-speed-side manifold part 56a have a shape such that another low-speed-side passage 54 has a negative pressure by ejector effect as exhaust is discharged to the low-speed-side manifold part 56a. In a low-speed region, an overlap duration of one cylinder 12 and a valve-opening start timing of an exhaust valve 20 of the other cylinder 12 are overlapped with each other, and the flow channel area variable valve 58 is set at a closing side. In a high-speed region, the flow channel area variable valve 58 is fully opened. A crossing angle β of an axial center at a downstream end of each high-speed-side passage 53 is larger than a crossing angle α of an axial center at a downstream end of each low-speed-side passage 54.
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Inventors:
Takamasa Matsumoto
Naoyuki Yamagata
Naoyuki Yamagata
Application Number:
JP2010255650A
Publication Date:
April 16, 2014
Filing Date:
November 16, 2010
Export Citation:
Assignee:
Mazda Corporation Inc
International Classes:
F02B27/06; F01N13/08; F01N13/10; F02D9/04; F02D13/02
Domestic Patent References:
| JP63277814A | ||||
| JP2009097335A | ||||
| JP5052117A | ||||
| JP2157420A |
Attorney, Agent or Firm:
Etsushi Kotani
Masataka Otani
Masataka Otani