US 12,104,548 B2
Electronic control device and engine control system
Kunihiko Suzuki, Hitachinaka (JP)
Assigned to Hitachi Astemo, Ltd., Hitachinaka (JP)
Appl. No. 18/027,503
Filed by Hitachi Astemo, Ltd., Hitachinaka (JP)
PCT Filed Aug. 27, 2021, PCT No. PCT/JP2021/031506
§ 371(c)(1), (2) Date Mar. 21, 2023,
PCT Pub. No. WO2022/074957, PCT Pub. Date Apr. 14, 2022.
Claims priority of application No. 2020-169269 (JP), filed on Oct. 6, 2020.
Prior Publication US 2023/0407800 A1, Dec. 21, 2023
Int. Cl. F02D 41/22 (2006.01); F02D 41/00 (2006.01); F02D 41/24 (2006.01)
CPC F02D 41/008 (2013.01) [F02D 41/0002 (2013.01); F02D 41/0052 (2013.01); F02D 41/22 (2013.01); F02D 41/2464 (2013.01); F02D 2200/0408 (2013.01); F02D 2200/101 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An electronic control device that controls an engine including an EGR system that includes an EGR pipe that returns a part of exhaust gas of an internal combustion engine to an intake pipe and an EGR valve disposed in the EGR pipe, an air flow sensor that detects a flow rate of air taken into the intake pipe,
a throttle valve provided on a downstream side of the air flow sensor, and an intake pipe pressure sensor that is provided on a downstream side of the throttle valve and on a downstream side of a connection portion between the intake pipe and the EGR pipe and detects an intake pipe pressure that is a pressure downstream of the throttle valve in the intake pipe, the electronic control device comprising:
a state estimation unit that estimates the intake pipe pressure and an EGR rate based on a detection value from the air flow sensor and an EGR valve opening; and
an estimation value correction unit that corrects an EGR rate estimation value estimated by the state estimation unit based on a detection value from the intake pipe pressure sensor and an intake pipe pressure estimation value estimated by the state estimation unit.