Title:
多気筒エンジン
Document Type and Number:
Japanese Patent JP5794045
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a multi-cylinder engine capable of controlling the residual amount of high-temperature exhaust air in a cylinder to be small in a low-speed high-load range while leaving a large amount of high-temperature exhaust air in the cylinder in a low-speed low-load range.SOLUTION: There is provided a passage state changing means 55f which is capable of changing the exhaust distribution state in an exhaust manifold 50 into: a first state in which exhaust air in each independent exhaust passage 52 passes through a passage with its flow passage area being smaller toward the downstream side; and a second state in which exhaust air in each independent exhaust passage 52 passes through a passage with its flow passage area being larger than that in the first state. In the low-speed high-load range A1, the distribution state is set to be the first state and the valve reopening operation of an exhaust valve is stopped, and an exhaust valve of one cylinder is opened during the overlap of the other cylinder between the cylinders in which the exhaust order is continuous. On the other hand, in the low-speed low-load range A2, the distribution state is set to be the second state and the valve reopening operation of the exhaust valve is executed.
Inventors:
Shuhei Tsujita
Application Number:
JP2011192855A
Publication Date:
October 14, 2015
Filing Date:
September 05, 2011
Export Citation:
Assignee:
Mazda Corporation Inc
International Classes:
F02D9/04; F01N13/08; F02B27/04; F02B27/06; F02D9/02; F02D9/12; F02D13/02
Domestic Patent References:
| JP2007085241A | ||||
| JP2009097335A | ||||
| JP2010185403A | ||||
| JP2007132319A | ||||
| JP2010025052A | ||||
| JP3009011A |
Attorney, Agent or Firm:
Etsushi Kotani
Masataka Otani
Ko Sato
Masataka Otani
Ko Sato