# US 9,435,278 B2 · Control system for internal combustion engine

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- Number: US 9,435,278 B2
- Document ID: US9435278B2
- Status: Granted
- Kind: B2
- Application number: 14/426,174
- Filed: 2013-09-03
- Published: 2015-08-13
- Granted: 2016-09-06
- Earliest claimed: 2012-09-07
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Kazuki Iwatani
- Inventors: Kazuki Iwatani
- Web page: https://patentgrep.com/patent/US9435278B2

## CPC

- F02D 41/0245: {by increasing temperature of the exhaust gas leaving the engine}
- F01N 3/021: by means of filters
- F01N 3/023: using means for regenerating the filters, e.g. by burning trapped particles
- F01N 3/035: with catalytic reactors
- F01N 3/2033: {using a fuel burner or introducing fuel into exhaust duct}
- F01N 3/206: {Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents}
- F01N 3/2066: {Selective catalytic reduction [SCR]}
- F02D 41/0002: {Controlling intake air}
- F02D 41/025: {by changing the composition of the exhaust gas, e.g. for exothermic reaction on exhaust gas treating apparatus}
- F02D 41/182: {for the control of a fuel injection device}
- F02D 41/40: with means for controlling injection timing or duration
- F01N 3/0814: {combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts}
- F01N 2330/30: Honeycomb supports characterised by their structural details
- F01N 2330/34: with flow channels of polygonal cross section
- F01N 2430/06: by varying fuel-air ratio, e.g. by enriching fuel-air mixture
- F01N 2560/06: the means being a temperature sensor
- F01N 2900/08: said parameters being related to the engine
- F01N 2900/1404: Exhaust gas temperature
- F01N 2900/1602: Temperature of exhaust gas apparatus
- F01N 2900/1606: Particle filter loading or soot amount
- F01N 2900/1626: Catalyst activation temperature
- F02D 41/0255: {to accelerate the warming-up of the exhaust gas treating apparatus at engine start}
- F02D 41/0275: {the exhaust gas treating apparatus being a NOx trap or adsorbent}
- F02D 41/029: {the exhaust gas treating apparatus being a particulate filter}
- F02D 41/045: {Detection of accelerating or decelerating state (detection thereof in general G01P)}
- F02D 41/1466: {the characteristics being a soot concentration or content}
- F02D 2041/001: {for engines with variable valve actuation}
- F02D 2041/0022: {for diesel engines by throttle control}
- F02D 2200/0802: Temperature of the exhaust gas treatment apparatus
- F02D 2200/0812: Particle filter loading
- Y02T 10/12: Improving ICE efficiencies
- Y02T 10/40: Engine management systems
- F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W)
- F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

The present invention pertains to a control system for an internal combustion engine equipped with an exhaust gas purification apparatus including an NOx catalyst having an ability of reducing NOx and a particulate filter, and its object is to prevent deterioration in the acceleration performance while preventing an increase in exhaust emissions when the temperature of the NOx catalyst is low. The control system for an internal combustion engine according to the present invention includes an exhaust gas purification apparatus provided in an exhaust passage of the internal combustion engine and including an NOx catalyst having an ability of reducing NOx and a particulate filter, intake air quantity restriction means for restricting the intake air quantity in relation to the temperature of the NOx catalyst, fuel restriction means for restricting the fuel injection quantity in relation to the intake air quantity of the internal combustion engine, and trapped PM amount obtaining means for obtaining the amount of PM trapped in the particulate filter. When the amount of PM trapped in the particulate filter is not larger than a predetermined amount and the internal combustion engine is in an accelerating operation state, the control system corrects a restriction value of the fuel injection quantity in relation to the intake air quantity of the internal combustion engine and the temperature of the NOx catalyst.

## Claims

### Claim 1

A control system for an internal combustion engine, comprising:
an exhaust gas purification apparatus arranged in an exhaust passage of the internal combustion engine and including an NOx catalyst having an ability of reducing NOx and a particulate filter; and
an electronic control unit configured to:
obtain the temperature of said NOx catalyst;
restrict the intake air quantity of the internal combustion engine in such a way as to make the air intake quantity smaller when the obtained temperature is less than a first predetermined temperature, as compared to when the obtained temperature is greater than the first predetermined temperature;
restrict a fuel injection quantity in relation to the intake air quantity of the internal combustion engine;
obtain a trapped PM amount, which is defined to be the amount of particulate matter trapped in said particulate filter; and
correct a restriction value of the fuel injection quantity, when the obtained trapped PM amount is not larger than a predetermined amount and the internal combustion engine is in an accelerating operation state, in such a way that the fuel injection quantity restriction is decreased when the obtained temperature is less than a second predetermined temperature and the intake air quantity is greater than a predetermined air-quantity amount as compared to when the obtained temperature is greater than the second predetermined temperature and/or the intake air quantity is less than the predetermined air-quantity amount.