# US 11,306,639 B2 · Systems and methods for increasing reductant insertion accuracy

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- Number: US 11,306,639 B2
- Document ID: US11306639B2
- Status: Granted
- Kind: B2
- Application number: 17/263,236
- Filed: 2018-08-07
- Published: 2021-05-20
- Granted: 2022-04-19
- Earliest claimed: 2018-08-07
- Assignees: Cummins Emission Solutions Inc.
- Applicants: Cummins Emission Solutions Inc.
- Inventors: Vikram Sundararajan; Joe V. Hill; Stephen M. Holl; Masoud Ziabakhsh Deilami
- Web page: https://patentgrep.com/patent/US11306639B2

## CPC

- F01N 3/208: {Control of selective catalytic reduction [SCR], e.g. by adjusting the dosing of reducing agent}
- 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)
- F01N 11/00: Monitoring or diagnostic devices for exhaust-gas treatment apparatus
- F01N 2550/05: Systems for adding substances into exhaust
- F01N 2610/02: the substance being ammonia or urea
- F01N 2610/144: Control thereof
- F01N 2610/146: Control thereof, e.g. control of injectors or injection valves
- F01N 2900/0412: using pre-calibrated maps, tables or charts
- F01N 2900/1808: Pressure
- F01N 2900/1812: Flow rate
- F01N 2900/1821: Injector parameters
- F01N 2900/1822: Pump parameters
- Y02T 10/12: Improving ICE efficiencies
- 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)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

An aftertreatment system comprises a SCR system, a reductant injector operatively coupled to the SCR system, and a reductant insertion assembly operatively coupled to the reductant injector. The reductant insertion assembly comprises a pump configured to pump the reductant through the reductant injector. A controller is operatively coupled to the reductant insertion assembly and configured to receive predetermined calibration values of the pump corresponding to delivery of a reductant by the pump through a calibration injector. The controller determines a desired flow rate value of the reductant into the SCR system. The controller determines an insertion time of the reductant injector for delivering the reductant through the reductant injector based on the desired flow rate value, a pump operating parameter value of the pump and the predetermined calibration values, and activates the reductant injector for the insertion time.

## Claims

### Claim 1

An aftertreatment system comprising:
a selective catalytic reduction system;
a reductant injector operatively coupled to the selective catalytic reduction system;
a reductant insertion assembly operatively coupled to the reductant injector, the reductant insertion assembly comprising:
a pump configured to pump a reductant through the reductant injector, and
a pressure sensor including a memory configured to store predetermined calibration values of the pump corresponding to delivery of a reductant by the pump through a calibration injector; and
a controller operatively coupled to the reductant insertion assembly, the controller configured to:
receive the predetermined calibration values from the pressure sensor,
determine a desired flow rate value of the reductant into the selective catalytic reduction system,
determine an insertion time of the reductant injector for delivering the reductant through the reductant injector based on the desired flow rate value, a pump operating parameter value of the pump, and the predetermined calibration values, and
activate the reductant injector for the insertion time.

### Claim 2 (depends on 1)

The aftertreatment system of claim 1, wherein the predetermined calibration values comprise at least one of a calibration pressure value, a calibration flow rate value, and a calibration insertion parameter value of the pump corresponding to delivery of the reductant through the calibration injector at the calibration pressure value and the calibration flow rate value.

### Claim 3 (depends on 2)

The aftertreatment system of claim 2, wherein the calibration insertion parameter value comprises at least one of a calibration insertion frequency value, a calibration speed value or a calibration stroke value of the pump.

### Claim 4 (depends on 2)

The aftertreatment system of claim 2, wherein the pump operating parameter value comprises a pump operating insertion frequency value corresponding to a pump operating pressure value being equal to the calibration pressure value, and wherein the insertion time of the reductant injector is based on the pump insertion frequency value.

### Claim 5 (depends on 2)

The aftertreatment system of claim 2, wherein the calibration pressure value comprises a fixed calibration pressure value.

### Claim 6 (depends on 5)

The aftertreatment system of claim 5, wherein the predetermined calibration value comprises a single calibration flow rate value and a corresponding single calibration insertion parameter value.

### Claim 7 (depends on 5)

The aftertreatment system of claim 5, wherein the predetermined calibration value comprises a plurality of calibration flow rate values and a corresponding plurality of the calibration insertion parameter values.

### Claim 8 (depends on 5)

The aftertreatment system of claim 5, wherein the predetermined calibration values comprises a slope of a range of flow rate values vs a corresponding range of the calibration insertion parameter values.

### Claim 9

A method for delivering a reductant into a selective catalytic reduction system via a reductant injector using a reductant insertion assembly comprising a pump and a pressure sensor, the method comprising;
receiving predetermined calibration values of the pump corresponding to delivery of a reductant by the pump through a calibration injector, the predetermined calibration values stored on a memory of the pressure sensor;
determining a desired flow rate of the reductant into the selective catalytic reduction system;
determining an insertion time of the reductant injector for delivering the reductant through the reductant injector based on the desired flow rate value, a pump operating parameter value of the pump and the predetermined calibration values; and
activating the reductant injector for the insertion time.

### Claim 10 (depends on 9)

The method of claim 9, further comprising:
prior to receiving the predetermined calibration values, fluidly coupling the reductant insertion assembly to the calibration injector;
determining calibration values of the pump based on delivery of the reductant by the pump through the calibration injector; and
storing the predetermined calibration values in the memory of the pressure sensor.

### Claim 11 (depends on 9)

The method of claim 9, wherein the predetermined calibration values comprise at least one of a calibration pressure value, a calibration flow rate value, and a calibration insertion parameter value of the pump corresponding to delivery of the reductant through the calibration injector at the calibration pressure value and the calibration flow rate value.

### Claim 12 (depends on 11)

The method of claim 11, wherein the calibration insertion parameter value comprises at least one of a calibration insertion frequency value, a calibration speed value or a calibration stroke value of the pump.

### Claim 13 (depends on 11)

The method of claim 11, wherein the pump operating parameter value comprises a pump insertion frequency value corresponding to a pump operating pressure value being equal to the calibration pressure value, and wherein the insertion time of the reductant injector is based on the pump insertion frequency value.

### Claim 14 (depends on 11)

The method of claim 11, wherein the calibration pressure value comprises a fixed calibration pressure value.

### Claim 15 (depends on 14)

The method of claim 14, wherein the predetermined calibration value comprises a single calibration flow rate value and a corresponding single calibration insertion parameter value.

### Claim 16 (depends on 14)

The method of claim 14, wherein the predetermined calibration value comprises a plurality of calibration flow rate values and a corresponding plurality of the calibration insertion parameter values.

### Claim 17 (depends on 14)

The method of claim 14, wherein the predetermined calibration values comprises a slope of a range of flow rate values vs a corresponding range of the calibration insertion parameter values.

### Claim 18

A control circuitry for controlling a flow rate of a reductant into an aftertreatment system via a reductant injector, the control circuitry comprising:
a controller comprising a memory, a processor, and a communication interface, the controller configured to be operatively coupled to a reductant insertion assembly comprising a pump and a pressure sensor including a pressure sensor memory, the pressure sensor memory storing predetermined calibration values of the pump corresponding to delivery of a reductant by the pump through a calibration injector, the controller configured to:
receive the predetermined calibration values of the pump from the pressure sensor,
determine a desired flow rate of the reductant into the selective catalytic reduction system,
determine an insertion time of the reductant injector for delivering the reductant through the reductant injector based on the desired flow rate value, a pump operating parameter value of the pump, and the predetermined calibration values, and
activate the reductant injector for the insertion time.

### Claim 19 (depends on 18)

The control circuitry of claim 18, wherein the predetermined calibration values comprise at least one of a calibration pressure value, a calibration flow rate value, and a calibration insertion parameter value of the pump corresponding to delivery of the reductant through the calibration injector at the calibration pressure value and the calibration flow rate value.

### Claim 20 (depends on 19)

The control circuitry of claim 19, wherein the calibration insertion parameter comprises at least one of a calibration insertion frequency value, a calibration speed value or a calibration stroke value of the pump.

### Claim 21 (depends on 20)

The control circuitry of claim 20, wherein the pump operating parameter value comprises a pump insertion frequency value corresponding to a pump operating pressure value being equal to the calibration pressure value, and wherein the insertion time of the reductant injector is based on the pump insertion frequency value.

### Claim 22 (depends on 19)

The control circuitry of claim 19, wherein the calibration pressure value comprises a fixed calibration pressure value.