# US 10,309,327 B2 · Control device for internal combustion engine

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- Number: US 10,309,327 B2
- Document ID: US10309327B2
- Status: Granted
- Kind: B2
- Application number: 15/875,255
- Filed: 2018-01-19
- Published: 2018-07-26
- Granted: 2019-06-04
- Earliest claimed: 2017-01-24
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jidosha Kabushiki Kaisha
- Inventors: Tatsuaki Suzuki
- Web page: https://patentgrep.com/patent/US10309327B2

## CPC

- F02D 41/025: {by changing the composition of the exhaust gas, e.g. for exothermic reaction on exhaust gas treating apparatus}
- F01N 3/101: {Three-way catalysts}
- F01N 9/00: Electrical control of exhaust gas treating apparatus (monitoring or diagnostic devices for exhaust-gas treatment apparatus F01N11/00; conjoint electrical control of two or more combustion engine functions F02D43/00)
- F02D 41/123: {the fuel injection being cut-off}
- F02D 41/1454: {the characteristics being an oxygen content or concentration or the air-fuel ratio}
- F02P 9/002: {Control of spark intensity, intensifying, lengthening, suppression (by means of current control in the storage devices F02P3/05, F02P3/09, during starting F02P15/12)}
- F01N 2430/06: by varying fuel-air ratio, e.g. by enriching fuel-air mixture
- F01N 2900/1402: Exhaust gas composition
- F01N 2900/1602: Temperature of exhaust gas apparatus
- F02D 41/008: {Controlling each cylinder individually}
- F02D 41/26: using computer, e.g. microprocessor
- F02D 2200/0802: Temperature of the exhaust gas treatment apparatus
- 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)
- F02P: IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES ({anti-pollution means for internal-combustion engines F02B17/00}; specially adapted for rotary-piston or oscillating-piston engines F02B53/12; {ignition of gas turbine plants F02C7/26; ignition of jet propulsion plants F02K9/95; starting of combustion engines F02N9/00}; ignition of combustion apparatus in general, glowing plugs F23Q; measuring of physical variables in general G01; controlling in general G05; data processing in general G06; electrical components in general see Section H; {ignition coils H01F38/12}; sparking plugs H01T13/00)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A control device for an internal combustion engine includes an electronic control unit. The electronic control unit is configured to execute temperature rise processing in which a temperature of a catalyst is raised by an air-fuel ratio of at least one of a plurality of cylinders being controlled to a rich air-fuel ratio, an air-fuel ratio of each of the other cylinders being controlled to a lean air-fuel ratio, and a fuel being ignited, and allow the temperature rise processing to continue, by allowing the fuel injection to continue while prohibiting the ignition of the fuel, in a case where the fuel cut request is present and the temperature of the catalyst is equal to or higher than the threshold during the execution of the temperature rise processing.

## Claims

### Claim 1

A control device for an internal combustion engine, the control device comprising an electronic control unit configured to:
execute temperature rise processing in which a temperature of a catalyst cleaning exhaust gas from a plurality of cylinders of the internal combustion engine is raised by an air-fuel ratio of at least one of the cylinders being controlled to a rich air-fuel ratio lower than a stoichiometric air-fuel ratio, an air-fuel ratio of each of the other cylinders being controlled to a lean air-fuel ratio higher than the stoichiometric air-fuel ratio, and a fuel being ignited;
determine whether or not the execution of the temperature rise processing is ongoing;
determine whether or not a fuel cut request for stopping fuel injection of the internal combustion engine is present during the execution of the temperature rise processing;
determine whether or not a parameter correlating with the temperature of the catalyst indicates that the temperature of the catalyst is equal to or higher than a threshold; and
allow the temperature rise processing to continue, by allowing the fuel injection to continue while prohibiting the ignition of the fuel, when the fuel cut request is present and the temperature of the catalyst is equal to or higher than the threshold during the execution of the temperature rise processing.

### Claim 2 (depends on 1)

The control device according to claim 1, wherein the electronic control unit is configured to execute the temperature rise processing such that a difference between the rich air-fuel ratio and the lean air-fuel ratio is smaller in a case where the ignition of the fuel is prohibited than in a case where the ignition of the fuel is executed.

### Claim 3 (depends on 1)

The control device according to claim 1, wherein the electronic control unit is configured to execute fuel cut with the temperature rise processing prohibited in a case where the parameter indicates that the temperature of the catalyst is lower than the threshold.