Exhaust purification system for internal combustion engine

Patent metadata

Field	Value
Publication number	US-10934920-B2
Application number	US-201916289663-A
Country	US
Kind code	B2
Filing date	Mar 1, 2019
Priority date	Mar 2, 2018
Publication date	Mar 2, 2021
Grant date	Mar 2, 2021

Abstract

Disclosed is an exhaust purification system for an internal combustion engine applied to a hybrid vehicle that performs EV travel after system power is turned on. The exhaust purification system includes: an exhaust purification catalyst; a heating element configured to generate heat with reception of power to heat the exhaust purification catalyst; a battery configured to supply the power to a motor and the heating element; a sensing unit configured to sense riding of an occupant in the hybrid vehicle; and a controller configured to execute first control to control the supply of the power from the battery to the heating element so that the power of electric energy of a prescribed ratio among activation electric energy is supplied to the heating element when the riding of the occupant is sensed by the sensing unit and a storage amount of the battery is larger than a second storage amount.

First claim

What is claimed is:

1. An exhaust purification system for an internal combustion engine applied to a hybrid vehicle including the internal combustion engine and a motor and capable of performing electric vehicle (EV) travel to travel on a driving force of the motor with the internal combustion engine stopped, the hybrid vehicle performing the EV travel after system power for driving the hybrid vehicle is turned on,
the exhaust purification system comprising:
an exhaust purification catalyst that is provided in an exhaust path of the internal combustion engine and purifies a prescribed component contained in exhaust of the internal combustion engine;
a heating element that is provided in the exhaust path and generates heat with reception of power to heat the exhaust purification catalyst;
a battery configured to supply the power to the motor and the heating element, wherein a state of charge (SOC) amount of the battery where the battery is requested to be charged by a driving force of the internal combustion engine is a first storage amount, and a second storage amount is a prescribed margin greater than the first storage amount;
a sensing unit configured to sense riding of an occupant in the hybrid vehicle; and
a controller comprising at least one processor,
the controller is configured to:
execute, in response to the SOC amount of the battery being greater than the second storage amount and the riding of the occupant is sensed by the sensing unit, first control to control the supply of the power from the battery to the heating element so that the power of electric energy of a prescribed ratio among activation electric energy, which represents electric energy required to activate the exhaust purification catalyst using the heating element, is supplied to the heating element, wherein,

when a SOC amount of the battery enough to allow the exhaust purification catalyst to be activated even if the supply of the power from the battery to the heating element is started during the EV travel of the hybrid vehicle is a third storage amount,
the controller executes the first control if the riding of the occupant is sensed by the sensing unit and the SOC amount of the battery is larger than the second storage amount and smaller than the third storage amount, and does not execute the first control if the riding of the occupant is sensed by the sensing unit and the SOC amount of the battery is the third storage amount or more.

2. The exhaust purification system for the internal combustion engine according to claim 1 , wherein
the controller is further configured to:
execute second control in which the supply of the power from the battery to the heating element is controlled so that power of electric energy obtained by subtracting electric energy supplied by the first control from the activation electric energy is supplied to the heating element when the execution of the first control is completed and the system power is turned on,
wherein the controller makes supplied electric power per unit time in the first control larger than supplied electric power per unit time in the second control.

3. The exhaust purification system for the internal combustion engine according to claim 1 , wherein
the hybrid vehicle is a vehicle in which the internal combustion engine is started when a driving request load for the vehicle is larger than a prescribed load, the prescribed load being made smaller when the SOC amount of the battery is small compared to when the SOC amount of the battery is large, and
the controller makes the prescribed ratio larger to execute the first control when the SOC amount of the battery is small compared to when the SOC amount of the battery is large.

4. The exhaust purification system for the internal combustion engine according to claim 3 , wherein
the controller is further configured to:
execute second control in which the supply of the power from the battery to the heating element is controlled so that power of electric energy obtained by subtracting electric energy supplied by the first control from the activation electric energy is supplied to the heating element when the execution of the first control is completed and the system power is turned on,
wherein the controller makes supplied electric power per unit time in the first control larger than supplied electric power per unit time in the second control.

5. The exhaust purification system for the internal combustion engine according to claim 1 , wherein
the hybrid vehicle is a vehicle in which the internal combustion engine is started when a driving request load for the vehicle is larger than a prescribed load, the prescribed load being made smaller when a temperature of the battery is low compared to when the temperature of the battery is high, and
the controller makes the prescribed ratio larger to execute the first control when the temperature of the battery is low compared to when the temperature of the battery is high.

6. The exhaust purification system for the internal combustion engine according to claim 5 , wherein
the controller is further configured to:
execute second control in which the supply of the power from the battery to the heating element is controlled so that power of electric energy obtained by subtracting electric energy supplied by the first control from the activation electric energy is supplied to the heating element when the execution of the first control is completed and the system power is turned on,
wherein the controller makes supplied electric power per unit time in the first control larger than supplied electric power per unit time in the second control.

7. The exhaust purification system for the internal combustion engine according to claim 5 , wherein
the hybrid vehicle is a vehicle in which the internal combustion engine is started when a driving request load for the vehicle is larger than a prescribed load, the prescribed load being made smaller when the SOC amount of the battery is small compared to when the SOC amount of the battery is large, and
the controller makes the prescribed ratio larger to execute the first control when the SOC amount of the battery is small compared to when the SOC amount of the battery is large.

8. The exhaust purification system for the internal combustion engine according to claim 7 , wherein
the controller is further configured to:
execute second control in which the supply of the power from the battery to the heating element is controlled so that power of electric energy obtained by subtracting electric energy supplied by the first control from the activation electric energy is supplied to the heating element when the execution of the first control is completed and the system power is turned on,
wherein the controller makes supplied electric power per unit time in the first control larger than supplied electric power per unit time in the second control.

9. An exhaust purification system for an internal combustion engine applied to a hybrid vehicle including the internal combustion engine and a motor and capable of performing electric vehicle (EV) travel to travel on a driving force of the motor with the internal combustion engine stopped, the hybrid vehicle performing the EV travel after system power for driving the hybrid vehicle is turned on,
the exhaust purification system comprising:
an exhaust purification catalyst that is provided in an exhaust path of the internal combustion engine and purifies a prescribed component contained in exhaust of the internal combustion engine;
a heating element that is provided in the exhaust path and generates heat with reception of power to heat the exhaust purification catalyst;
a battery configured to supply the power to the motor and th

Assignees

• Toyota Motor Co Ltd

Inventors

• Hirooka Shigemasa

Classifications

• B60W10/26

  for electrical energy, e.g. batteries or capacitors · CPC title

• F01N2900/104

  Battery status · CPC title

• F01N2240/16

  an electric heater, i.e. a resistance heater · CPC title

• B60W2510/244

  Charge state · CPC title

• F01N3/2066

  Selective catalytic reduction [SCR] · CPC title