US 12,188,426 B2
Control device for internal combustion engine
Kunihiko Suzuki, Hitachinaka (JP)
Assigned to Hitachi Astemo, Ltd., Hitachinaka (JP)
Appl. No. 18/280,285
Filed by Hitachi Astemo, Ltd., Hitachinaka (JP)
PCT Filed Jan. 25, 2022, PCT No. PCT/JP2022/002721
§ 371(c)(1), (2) Date Sep. 5, 2023,
PCT Pub. No. WO2022/224516, PCT Pub. Date Oct. 27, 2022.
Claims priority of application No. 2021-070585 (JP), filed on Apr. 19, 2021.
Prior Publication US 2024/0068423 A1, Feb. 29, 2024
Int. Cl. F02D 41/24 (2006.01); F02D 35/02 (2006.01); F02D 41/00 (2006.01); F02D 41/14 (2006.01); F02P 5/153 (2006.01); F02P 17/04 (2006.01)
CPC F02D 41/2451 (2013.01) [F02D 35/028 (2013.01); F02D 41/0052 (2013.01); F02D 41/009 (2013.01); F02D 41/1445 (2013.01); F02P 5/153 (2013.01); F02P 17/04 (2013.01); F02D 2041/1412 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A control device for an internal combustion engine comprising a processor that
operates a first combustion timing or a first combustion period in a cylinder of an internal combustion engine from a crank angle detected by a crank angle sensor,
operates a heat generation rate based on the first combustion timing or the first combustion period,
operates an in-cylinder pressure and an in-cylinder unburned gas temperature based on the heat generation rate,
operates a first combustion speed based on the in-cylinder pressure and the in-cylinder unburned gas temperature,
learns a correspondence relationship between the first combustion speed and the first combustion timing or the first combustion period, and
using the learned correspondence relationship to determine a combustion state of the internal combustion engine, wherein
the processor compares the first combustion speed, the first combustion timing, or the first combustion period with a threshold value for determining a fault state based on a learning result of the correspondence relationship, and diagnoses a fault based on a comparison result, or
predicts a period until reaching a fault state based on a temporal change in a learning result of the correspondence relationship and a threshold value for determining the fault state.