# US 10,309,286 B2 · Hybrid vehicle

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- Number: US 10,309,286 B2
- Document ID: US10309286B2
- Status: Granted
- Kind: B2
- Application number: 15/831,715
- Filed: 2017-12-05
- Published: 2018-06-07
- Granted: 2019-06-04
- Earliest claimed: 2016-12-07
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jidosha Kabushiki Kaisha
- Inventors: Kazuya Miyaji; Takashi Suzuki
- Web page: https://patentgrep.com/patent/US10309286B2

## CPC

- F01N 9/002: {of filter regeneration}
- F01N 3/023: using means for regenerating the filters, e.g. by burning trapped particles
- F01N 11/00: Monitoring or diagnostic devices for exhaust-gas treatment apparatus
- F01N 2430/06: by varying fuel-air ratio, e.g. by enriching fuel-air mixture
- F01N 2590/11: for hybrid vehicles
- F01N 2900/08: said parameters being related to the engine
- Y02T 10/40: Engine management systems
- Y02T 10/62: Hybrid vehicles
- 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

In a hybrid vehicle that includes an engine having a particulate matter removing filter configured to remove particulate matters in an exhaust system, when an increase in temperature of the particulate matter removing filter is requested in order to regenerate the particulate matter removing filter, dither control is executed to execute control such that an air-fuel ratio of the engine is repeated between a rich state and a lean state. Then, when the dither control is executed, control is executed such that the engine is operated at an operation point where the increase in temperature of the particulate matter removing filter is promoted among operation points where power output from the engine is retainable.

## Claims

### Claim 1

A hybrid vehicle comprising:
an engine including a particulate matter removing filter configured to remove particulate matters in an exhaust system of the engine;
a motor configured to output power for traveling of the hybrid vehicle;
an electric power storage device configured to exchange electric power with the motor; and
an electronic control unit configured to:
(i) control the engine and the motor,
(ii) when an increase in temperature of the particulate matter removing filter is requested in order to regenerate the particulate matter removing filter, execute dither control to execute control such that an air-fuel ratio of the engine is repeated between a rich state and a lean state, and
(iii) when the dither control is executed, execute control such that the engine is operated at an operation point with a lower engine output torque and higher engine rotation speed than when the dither control is not executed such that the increase in temperature of the particulate matter removing filter is promoted and the power output from the engine remains the same as when the dither control is not executed.

### Claim 2 (depends on 1)

The hybrid vehicle according to claim 1, wherein the electronic control unit is configured to:
(i) when the dither control is not executed, execute control such that the engine is operated at an operation point of an engine output torque and an engine rotation speed on a prescribed operation line for optimum fuel efficiency, and
(ii) when the dither control is executed, execute control such that the engine is operated at an operation point of an engine output torque and an engine rotation speed where the increase in temperature of the particulate matter removing filter is optimum among the operation points where the power output from the engine remains the same as when the dither control is not executed.