GB2558638A - Method to control the activation of a reductant doser - Google Patents

Method to control the activation of a reductant doser Download PDF

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Publication number
GB2558638A
GB2558638A GB1700590.1A GB201700590A GB2558638A GB 2558638 A GB2558638 A GB 2558638A GB 201700590 A GB201700590 A GB 201700590A GB 2558638 A GB2558638 A GB 2558638A
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GB
United Kingdom
Prior art keywords
doser
chopped
solenoid
voltage
injector
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB1700590.1A
Other versions
GB201700590D0 (en
Inventor
A P Sykes Martin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Delphi International Operations Luxembourg SARL
Original Assignee
Delphi International Operations Luxembourg SARL
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Delphi International Operations Luxembourg SARL filed Critical Delphi International Operations Luxembourg SARL
Priority to GB1700590.1A priority Critical patent/GB2558638A/en
Publication of GB201700590D0 publication Critical patent/GB201700590D0/en
Publication of GB2558638A publication Critical patent/GB2558638A/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/20—Exhaust treating devices having provisions not otherwise provided for for heat or sound protection, e.g. using a shield or specially shaped outer surface of exhaust device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • F01N2610/146—Control thereof, e.g. control of injectors or injection valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1493—Purging the reducing agent out of the conduits or nozzle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Abstract

A solenoid operated reductant injector (doser) is operated by applying a chopped voltage waveform profile across the solenoid of the doser during the pull-in phase. Use of a chopped (pulsed) voltage reduces the impact force in operation and hence reduces the noise caused by operation of the injector solenoid.

Description

(71) Applicant(s):
Delphi International Operations Luxembourg S.a.r.l. Avenue de Luxembourg, Bascharage 4940, Luxembourg
1700590.1 (51) INT CL:
F01N 3/20 (2006.01)
13.01.2017 (56) Documents Cited:
GB 2095065 A US 6297941 B1
US 20150300522 A1 US 20060067025 A1 (58) Field of Search:
INT CL F01N, H01F, H03K
Other: WPI, EPODOC, Patent Fulltext (72) Inventor(s):
Martin A P Sykes (74) Agent and/or Address for Service:
Delphi France SAS c/o Delphi Technologies, Campus Saint Christophe, 95863 Cergy Pontoise CEDEX,
France (including Overseas Departments and Territori es) (54) Title of the Invention: Method to control the activation of a reductant doser
Abstract Title: Reductant injector operated with chopped voltage profile during pull-in phase (57) A solenoid operated reductant injector (doser) is operated by applying a chopped voltage waveform profile across the solenoid of the doser during the pull-in phase. Use of a chopped (pulsed) voltage reduces the impact force in operation and hence reduces the noise caused by operation of the injector solenoid.
Figure GB2558638A_D0001
FIG. 2 /2 (Λ) ΞΟνίΊΟΛ
Figure GB2558638A_D0002
Μ- C\l ι- 00 CD τ— C\l Oo
J J O O O O (SdlAIV) ΙΝΞΗΗΠΟ
2/2
Figure GB2558638A_D0003
(Sdiw) iNdunno
METHOD TO CONTROL THE ACTIVATION OF A REDUCTANT DOSER
TECHNICAL FIELD
This invention relates to dosers used to inject a reductant such as urea into a vehicle exhaust system and in particular to a method of operation used to reduce noise of operation.
BACKGROUND OF THE INVENTION
In modern engine systems it is common for injectors to inject reductant such as urea into the exhaust system for controlling emissions. The injector is often referred to as a doser and the systems which use these are typically referred to a SCR (selective catalytic reduction) systems. Such injectors are typically solenoid actuated injectors; where activation of a solenoid operates a valve to allow injection of reductant such as urea.
Under most conditions, the operation of the doser does not produce a noticeable audible noise, and engine and vehicle noise is usually greater. However when the vehicle is stationary, doser noise may be heard. Further to this, when the SCR dosing system is shut down, the vehicle will be stationary and the engine is off. Operation of the doser when purging the SCR system will produce an audible noise.
It is an object of the invention to overcome these problems.
SUMMARY OF THE INVENTION
A method of controlling a solenoid operated reductant injector, comprising applying a voltage profile across the solenoid of the doser; where the voltage applied in the pull-in phase is chopped such the resultant current through the injector has a chopped waveform.
The voltage /current may be chopped continuously during the voltage profile.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention is now described by way of example with reference to the accompanying drawings in which:
Figure 1 shows a plots of both the voltage 1 applied/present across the terminals of a reductant injector as well as the resultant current through the doser (injector solenoid); and,
Figure 2 shows plots of current against time across the solenoid of a doser for a known method of operation and one which produces a chopped current waveform according to one aspect.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Figure 1 shows a plot of both the voltage 1 applied/present across the (solenoid) terminals of a reductant injector as well as the resultant current 2 i.e. though the doser (injector solenoid). As can be seen the doser is activated by providing a step increase in voltage. The current through the doser (injector solenoid) then ramps up to reach a peak value. During the time indicated by circle A, the injector opens. The current reaches a plateau value indicated by circle B, after which the voltage applied is chopped, to maintain the reductant injector in an open position, The current through the injector then begins to fall as shown in the plot. At time C the voltage across the injector is set negative and the doser begins to close; the current rapidly decreases to a level close to zero. So during this time the injector closes.
In one aspect is provided a method to reduce operational noise of the doser noise by changing the drive waveform.
In a simple example of the invention, the drive waveform, that is the voltage (waveform) applied to the solenoid of the doser is chopped. In particular voltage applied during the pull-in phase is chopped, i.e. the voltage is chopped from the start of the cycle of operation until at least the time that the doser is open.
Figure 2 shows plots of current against time across the solenoid of a doser for a known method of operation 3 and one which produces a chopped current waveform 4 according to one aspect. As can be seen it is known to produce a chopped current waveform after the doser is open at point A, however usually initially until the valve is open and/or the current reaches a maximum value of steady state at point A, the voltage applied is usually increased by applying a step increase at time = 0.
In plot 4 the voltage applied from time t=0 is chopped so as to produce a corresponding chopped waveform of the current. The chopped waveform is produced during the pull-in phase denoted by the time span D.
Preferably as can be seen in the methodology of the invention, the voltage/current control of the solenoid is such that the maximum current is also less than in prior art methodology.
The reduced noise waveform uses a chopped pull in which will slow the opening of the doser and reduce the impact noise of the opening of the doser.

Claims (2)

1. A method of controlling a solenoid operated reductant injector, comprising applying a voltage profile across the solenoid of the doser; where the
5 voltage applied in the pull-in phase is chopped such the resultant current through the injector has a chopped waveform.
2. A method as claimed in claim 1 or two where the voltage /current is chopped continuously during the voltage profile.
Intellectual
Property
Office
Application No: Claims searched:
GB1700590.1A 2017-01-13 2017-01-13 Method to control the activation of a reductant doser Withdrawn GB2558638A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1700590.1A GB2558638A (en) 2017-01-13 2017-01-13 Method to control the activation of a reductant doser

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1700590.1A GB2558638A (en) 2017-01-13 2017-01-13 Method to control the activation of a reductant doser

Publications (2)

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GB201700590D0 GB201700590D0 (en) 2017-03-01
GB2558638A true GB2558638A (en) 2018-07-18

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2095065A (en) * 1981-03-12 1982-09-22 Lucas Industries Ltd Solenoid control circuit
US6297941B1 (en) * 1997-06-06 2001-10-02 Siemens Aktiengesellschaft Device for controlling an electromechanical actuator
US20060067025A1 (en) * 2004-09-30 2006-03-30 Jatco Ltd. Solenoid valve control unit
US20150300522A1 (en) * 2014-04-18 2015-10-22 Denso Corporation Electromagnetic-valve controller

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2095065A (en) * 1981-03-12 1982-09-22 Lucas Industries Ltd Solenoid control circuit
US6297941B1 (en) * 1997-06-06 2001-10-02 Siemens Aktiengesellschaft Device for controlling an electromechanical actuator
US20060067025A1 (en) * 2004-09-30 2006-03-30 Jatco Ltd. Solenoid valve control unit
US20150300522A1 (en) * 2014-04-18 2015-10-22 Denso Corporation Electromagnetic-valve controller

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Free format text: REGISTERED BETWEEN 20190222 AND 20190227

WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)