Electronic control device and engine control system
AssigneeHitachi Astemo, Ltd.
InventorKunihiko Suzuki
Life of this patent
Estimating the term…
Abstract
Provided is an electronic control device that controls an engine including an EGR system that includes an EGR pipe and an EGR valve disposed in the EGR pipe, an air flow sensor provided in an intake pipe, a throttle valve on a downstream side of the air flow sensor, and an intake pipe pressure sensor that detects an intake pipe pressure. The electronic control device includes a state estimation unit that estimates the intake pipe pressure and an EGR rate based on at least 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 from the state estimation unit based on a detection value from the intake pipe pressure sensor and an intake pipe pressure estimation value from the state estimation unit.
Claims14
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.
An engine control system including an engine and an electronic control device, the 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, wherein
- the electronic control device includes:
- 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.
Dependencies are inferred from the claim text.