US 11,674,465 B2
Combustion system
Kenji Aoyagi, Kariya (JP)
Assigned to DENSO CORPORATION, Kariya (JP)
Filed by DENSO CORPORATION, Kariya (JP)
Filed on Aug. 25, 2022, as Appl. No. 17/895,571.
Application 17/895,571 is a continuation of application No. PCT/JP2021/005020, filed on Feb. 10, 2021.
Claims priority of application No. JP2020-032207 (JP), filed on Feb. 27, 2020.
Prior Publication US 2022/0403794 A1, Dec. 22, 2022
Int. Cl. F02D 41/38 (2006.01); F02D 41/14 (2006.01); F02P 5/152 (2006.01)
CPC F02D 41/1497 (2013.01) [F02D 41/38 (2013.01); F02P 5/152 (2013.01); F02D 2041/389 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A combustion system comprising:
an injection apparatus configured to inject fuel into a combustion chamber of an engine;
an ignition plug configured to perform ignition on fuel in the combustion chamber; and
a normal control unit configured to perform a normal control to cause the injection apparatus to perform predetermined normal injection and subsequently to cause the ignition plug to perform the ignition, wherein
in a predetermined delay region in the combustion chamber, propagation of flame, which is caused by the ignition, is retarded further than in another region when the normal control is performed,
in a knock state, self-ignition occurs in fuel in the delay region when the normal control is performed,
the combustion system further comprising:
a knock determination unit configured to determine whether or not the knock state is established; and
an adjustment control unit configured to perform, on determination of the knock determination unit that the knock state is established, a predetermined adjustment control to suppress the self-ignition, wherein
the adjustment control is to
cause the injection apparatus to perform predetermined main injection and subsequently perform predetermined sub-injection in a second half of a compression stroke to adjust a fuel distribution in the combustion chamber to facilitate propagation of the flame, which is caused by the ignition, to the delay region further than in the normal injection and
subsequently cause the ignition plug to perform the ignition.