US 11,898,509 B2Granted

EGR estimation method for internal combustion engine and EGR estimation device for internal combustion engine

AssigneeNissan Motor Co., Ltd.

InventorsTaichi Ando, Kenji Suzuki

Life of this patent

Estimating the term…

Loading patent…

Abstract

An EGR estimation method for an internal combustion engine 1 estimates an EGR rate in an intake and exhaust system 10, 20 of an internal combustion engine, the intake and exhaust system 10, 20 of an internal combustion engine including an intake system 10, an exhaust system 20, and an EGR device 40, the EGR device 40 includes an EGR passage 41 and an EGR valve 43. The EGR estimation method includes determining a gas replacement state by exhaust gas and fresh air in an upstream EGR passage, which is a portion of the EGR passage between the EGR valve and the exhaust passage, when fuel cut of the internal combustion engine is started and the EGR valve is fully closed; and estimating the EGR rate based on a result of the determination.

Claims8

Dependent claims

An exhaust gas recirculation (EGR) estimation method for estimating an EGR rate in an intake and exhaust system of an internal combustion engine, the EGR estimation method comprising:

providing the intake and exhaust system, which comprises:
an intake passage that is connected to the internal combustion engine,
an exhaust passage that is connected to the internal combustion engine,
an EGR valve in which a gap occurs even when the EGR valve is fully closed, due to a structure of the EGR valve, and
an EGR passage comprising an upstream EGR passage that connects the exhaust passage to the EGR valve, and a downstream EGR passage that connects the EGR valve to the intake passage;
when a fuel cut of the internal combustion engine is started with the EGR valve fully closed:
maintaining the EGR valve fully closed during the execution of the fuel cut of the internal combustion engine, and
during the execution of the fuel cut of the internal combustion engine and/or after fuel injection of the internal combustion engine is restarted, determining a gas replacement state by exhaust gas and fresh air in the upstream EGR passage;
and
estimating the EGR rate based on a result of the determination of the gas replacement state.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/916,326Filed 2 Apr 2020
Published: US 2023/0151775 A118 May 2023
Granted: 13 Feb 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

F02D 41/0072
Specific aspects of external EGR control: estimating, calculating or determining the EGR rate, amount or flow
F02D 41/005
Controlling exhaust gas recirculation [EGR]: according to engine operating conditions
F02D 41/123
For deceleration: the fuel injection being cut-off
F02M 26/06
With a single turbocharger: low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger…

Family

US 2023/0151775 A1Pre-grant publication · published 18 May 2023
US 11,898,509 B2This patent

From the US filing history. Foreign family members aren’t listed.

Timeline

Citations

Open elsewhere

Building an agent or pulling many patents? Use the API or MCP server instead of scraping pages. Get an API key