# US 12,000,322 B2 · Post injection control method during exhaust brake operation

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- Number: US 12,000,322 B2
- Document ID: US12000322B2
- Status: Granted
- Kind: B2
- Application number: 17/065,680
- Filed: 2020-10-08
- Published: 2021-08-19
- Granted: 2024-06-04
- Earliest claimed: 2020-02-17
- Assignees: Hyundai Motor Company; Kia Motors Corporation
- Applicants: Hyundai Motor Company; Kia Motors Corporation
- Inventors: Byeong Gyu Song
- Web page: https://patentgrep.com/patent/US12000322B2

## CPC

- F01N 9/002: {of filter regeneration}
- F01N 3/0253: {adding fuel to exhaust gases}
- F02D 9/06: Exhaust brakes
- F02D 41/029: {the exhaust gas treating apparatus being a particulate filter}
- F02D 41/1446: {the characteristics being exhaust temperatures}
- F02D 41/405: {with post injections}
- F01N 2240/36: an exhaust flap
- F01N 2430/08: by modifying ignition or injection timing
- F02D 41/12: for deceleration {(F02D41/0005, F02D41/107 take precedence)}
- Y02T 10/40: Engine management systems
- 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)
- 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)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A system includes a vehicle operation detector, an exhaust brake operation unit, a diesel oxidation catalyst, a diesel particulate filter, an injector, and a controller for controlling the operation of the injector and the exhaust brake operation unit. A post injection control method during exhaust brake operation for the system includes: determining whether a predetermined regeneration condition of the diesel particulate filter according to the output signals of the vehicle operation detector is satisfied; performing, by the controller, regeneration by controlling the operation of the injector if the regeneration condition is satisfied; determining, by the controller, whether an exhaust brake operation condition is satisfied during regeneration based on the output signals of the vehicle operation detector; and controlling, by the controller, the operation of the injector to perform post-injection with a predetermined amount of fuel when the exhaust brake operation condition is met during the regeneration.

## Claims

### Claim 1

A post injection control method during exhaust brake operation of a system, wherein the system includes a vehicle operation detector that detects operation statuses of a vehicle, an exhaust brake valve that controls an exhaust gas flow of an engine, a diesel oxidation catalyst, a diesel particulate filter disposed downstream of the diesel oxidation catalyst, an injector for injecting fuel, and a controller for controlling an operation of the injector and the exhaust brake valve based on the detected operation statuses of the vehicle, the post injection control method comprising:
determining, by the controller, whether a predetermined regeneration condition of the diesel particulate filter based on output signals corresponding to the detected operation statuses from the vehicle operation detector is satisfied;
when the predetermined regeneration condition is satisfied, performing, by the controller, regeneration by controlling the operation of the injector;
during the regeneration, determining, by the controller, whether an exhaust brake operation condition is satisfied based on the output signals from the vehicle operation detector; and
when the exhaust brake operation condition is satisfied during the regeneration, controlling, by the controller, the operation of the injector to perform post-injection with a predetermined amount of fuel,
wherein the predetermined amount of fuel for the post injection is determined by the controller by applying a target temperature upstream of the diesel particulate filter, an actual temperature upstream of the diesel particulate filter, and a current engine revolutions per minute (RPM) into a predetermined post injection amount control map, and
wherein the predetermined post injection amount control map is preset based on the target temperature upstream of the diesel particulate filter, the actual temperature upstream of the diesel particulate filter, and a temperature change of the diesel oxidation catalyst according to an engine RPM during regeneration.

### Claim 2 (depends on 1)

The post injection control method of claim 1, wherein the exhaust brake operation condition during regeneration includes a state that a vehicle is overrun.

### Claim 3 (depends on 2)

The post injection control method of claim 2, wherein the exhaust brake operation condition during regeneration includes a state that an exhaust brake operation switch is on.

### Claim 4 (depends on 3)

The post injection control method of claim 3, wherein the exhaust brake operation condition during regeneration includes a state that a brake is in operation.