US 11,655,770 B2
Engine
Naohiro Yamaguchi, Aki-gun (JP); Mitsunori Wasada, Aki-gun (JP); Satoshi Imamura, Aki-gun (JP); and Toshimasa Kotani, Aki-gun (JP)
Assigned to Mazda Motor Corporation, Hiroshima (JP)
Filed by Mazda Motor Corporation, Hiroshima (JP)
Filed on Jan. 31, 2022, as Appl. No. 17/649,484.
Claims priority of application No. JP2021-036157 (JP), filed on Mar. 8, 2021.
Prior Publication US 2022/0282674 A1, Sep. 8, 2022
Int. Cl. F02D 13/02 (2006.01); F02B 75/20 (2006.01); F04D 17/10 (2006.01); F04D 29/42 (2006.01); F02B 75/18 (2006.01)
CPC F02D 13/0234 (2013.01) [F02B 75/20 (2013.01); F04D 17/10 (2013.01); F04D 29/4206 (2013.01); F02B 2075/1824 (2013.01)] 15 Claims
OG exemplary drawing
 
1. An engine, comprising:
an engine body including a cylinder provided with an intake port, an exhaust port, an intake valve, and an exhaust valve;
an intake passage and an exhaust passage connected to the engine body;
a turbocharger including a turbine provided to the exhaust passage and a compressor provided to the intake passage; and
a variable phase mechanism configured to change an open timing and a close timing of the intake valve while maintaining an open period of the intake valve at a given range of 270° or larger in crank angle,
wherein a geometric compression ratio of the cylinder is 11:1 or higher,
wherein, in a high-load range where an engine load is above a given reference load, the variable phase mechanism sets the close timing of the intake valve to be after an intake bottom dead center and to make a ratio of a retarded amount of intake closing with respect to the geometric compression ratio of the cylinder be 4.58 or above and 6.67 or below, and sets the open timing of the intake valve to be before a close timing of the exhaust valve, the retarded amount of the intake closing being a crank angle from the intake bottom dead center to the close timing of the intake valve.