SE1651034A1 - A system and a method for diagnosing status of a first filter unit and a second filter unit in a combustion engine configuration - Google Patents

A system and a method for diagnosing status of a first filter unit and a second filter unit in a combustion engine configuration Download PDF

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Publication number
SE1651034A1
SE1651034A1 SE1651034A SE1651034A SE1651034A1 SE 1651034 A1 SE1651034 A1 SE 1651034A1 SE 1651034 A SE1651034 A SE 1651034A SE 1651034 A SE1651034 A SE 1651034A SE 1651034 A1 SE1651034 A1 SE 1651034A1
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Sweden
Prior art keywords
unit
determining
filter unit
filter
pump unit
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Application number
SE1651034A
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Swedish (sv)
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SE540049C2 (en
Inventor
Albing Tommy
Sommansson Joakim
Original Assignee
Scania Cv Ab
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Publication date
Application filed by Scania Cv Ab filed Critical Scania Cv Ab
Priority to SE1651034A priority Critical patent/SE540049C2/en
Publication of SE1651034A1 publication Critical patent/SE1651034A1/en
Publication of SE540049C2 publication Critical patent/SE540049C2/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D33/00—Controlling delivery of fuel or combustion-air, not otherwise provided for
    • F02D33/003—Controlling the feeding of liquid fuel from storage containers to carburettors or fuel-injection apparatus ; Failure or leakage prevention; Diagnosis or detection of failure; Arrangement of sensors in the fuel system; Electric wiring; Electrostatic discharge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0076—Details of the fuel feeding system related to the fuel tank
    • F02M37/0088—Multiple separate fuel tanks or tanks being at least partially partitioned
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/18—Feeding by means of driven pumps characterised by provision of main and auxiliary pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
    • F02M37/32—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
    • F02M37/32—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements
    • F02M37/40—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements with means for detection of clogging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K2015/03118—Multiple tanks, i.e. two or more separate tanks

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

The invention relates to a method for diagnosing status of a first filter unit (240) and a second filter unit (280) in an internal combustion engine configuration (299), said engine configuration (299) comprising a first tank unit (220) for holding a liquid substance and a second tank unit (250) for holding said liquid substance, a first pump unit (230) for providing liquid substance from said first tank unit (220) to said second tank unit (250), a second pump unit (270) for providing liquid substance from said second tank unit (250) for consumption within said engine configuration (299), wherein said first filter unit (240) is arranged downstream of said first pump unit (230) and said second filter unit (280) is arranged downstream of said second pump unit (270), and a valve configuration (260), which in a first state provides operation of at least the second pump unit (270) and in a second state provides operation of only said first pump unit (230). By determining pressure values (P1, P2, P3) at various locations of a pipe arrangement, and pressure drops (ΔP1, ΔΡ2) over said filter units (240, 280) while shifting between said first and second states of said valve configuration said diagnosis may be performed. Said liquid substance may be a liquid fuel substance or a liquid reducing agent suitable for emission control of said engine configuration (299).The invention relates also to a computer programme product comprising program code (P) for a computer (200; 210) for implementing a method according to the invention. The invention relates also to a system for diagnosing status of said first filter unit (240) and said second filter unit (280) and a motor vehicle (100) equipped with the system.Figure 2 for publication

Description

A system and a method for diagnosing status of a first filter unit and a second filter unit in a combustion engine configuration TECHNICAL FIELD The present invention relates to a method for diagnosing status of a first filter unit and asecond filter unit in an internal combustion engine configuration. More particularly, thepresent invention relates to a method for diagnosing status of a first fuel filter unit and asecond fuel filter unit in an internal combustion engine configuration. The invention relatesalso to a computer program product comprising program code for a computer forimplementing a method according to the invention. lt relates also to a system for diagnosingstatus of a first filter unit and a second filter unit in an internal combustion engine configuration and a motor vehicle equipped with the system.BACKGROUND ART ln some liquid substance supply systems for an engine configuration of a vehicle two fueltanks are provided. According to one set-up there are two pump units and two filter unitsarranged in such a supply system. lt is desired to be able to determine performance of saidfilter units. Said liquid substance supply system may be a fuel supply system for an internal combustion engine.
One way of determining performance, or a degree of contamination, of such a filter unit is todetermine a pressure drop of said filter unit during operation. This could be performed bymeans of a first pressure sensor being arranged upstream of said filter unit and a second pressure sensor being arranged downstream of said filter unit. ln a fuel supply system having two or more filter units a plurality of pressure sensors isneeded for accurate diagnosis of the filter units. Such a set-up is rather expensive and is further requiring extra space paying regard to wiring, connectors, etc.
Said diagnosis is required for allowing adequate service and maintenance of said filter units.To be able to detect filter units which are clogged is naturally of outmost importance so as to avoid impaired operation of said engine configuration.
WO2014200424 relates to a fuel supply system comprising two fuel tanks and two fuel filterswherein a pump unit is arranged for each of said tanks. The system comprises two pressure sensors for detecting a pressure drop over a fuel filter.
SUMMARY OF THE INVENTION There is a need for determining performance, degree of contamination, of filter units in afuel supply system using a minimum of pressure sensors for an engine configuration. Thereis also a need for achieving a system presenting a reduced complexity and for minimizing the number of possible root causes.
An object of the present invention is to propose a novel and advantageous method fordiagnosing status of a first filter unit and a second filter unit in an internal combustion engine configuration.
An object of the present invention is to propose a novel and advantageous method fordiagnosing status of a first fuel filter unit and a second fuel filter unit in a fuel supply system presenting two fuel tanks in an internal combustion engine configuration.
Another object ofthe invention is to propose a novel and advantageous system and a noveland advantageous computer program for diagnosing status of a first filter unit and a second filter unit in an internal combustion engine configuration.
Another object ofthe invention is to propose a novel and advantageous system and a noveland advantageous computer program for diagnosing status of a first fuel filter unit and asecond fuel filter unit in a fuel supply system presenting two fuel tanks in an internal combustion engine configuration.
Another object ofthe present invention is to propose a novel and advantageous methodproviding a cost effective and reliable status diagnosis of a first filter unit and a second filter unit in a combustion engine configuration.
Another object ofthe invention is to propose a novel and advantageous system and a noveland advantageous computer program providing a cost effective and reliable status diagnosis of a first filter unit and a second filter unit in a combustion engine configuration.
Yet another object of the invention is to propose a method, a system and a computerprogram achieving a robust, accurate and automated status diagnosis of a first filter unit and a second filter unit in an internal combustion engine configuration.
Yet another object of the invention is to propose an alternative method, an alternativesystem and an alternative computer program for diagnosing status of a first filter unit and a second filter unit in an internal combustion engine configuration.
Some of these objects are achieved with a method according to claim 1. Other objects areachieved with a system in accordance with what is depicted herein. Advantageousembodiments are depicted in the dependent claims. Substantially the same advantages ofmethod steps of the innovative method hold true for corresponding means of the innovative system.
According to an aspect of the invention there is provided a method for diagnosing status of afirst filter unit and a second filter unit in an internal combustion engine configuration, saidengine configuration comprising a first tank unit for holding a liquid substance and a secondtank unit for holding said liquid substance, a first pump unit for providing liquid substancefrom said first tank unit to said second tank unit, a second pump unit for providing liquidsubstance from said second tank unit for consumption within said engine configuration,wherein said first filter unit is arranged downstream of said first pump unit and said secondfilter unit is arranged downstream of said second pump unit, and a valve configuration,which in a first state provides operation of at least the second pump unit and in a second state provides operation of only said first pump unit, comprising the steps of: - determining a first pressure value downstream of said first pump unit; - determining a second pressure value downstream of said second pump unit; - determining a third pressure value downstream of said second filter unit; - determining a second pressure drop over said second filter unit as a difference between said second pressure value and said third pressure value; - determining a first pressure drop over said first filter unit from a function specifying adifference between said third pressure value and said first pressure value and said second pressure drop; and - taking said first pressure drop over said first filter unit and said second pressure drop over said second filter unit as a basis for diagnosis for the respective filter units.
The method advantageously provides an accurate, robust and cost-effective diagnosis of atleast one filter unit of said internal combustion engine configuration. The method allowsminimizing the number of pressure sensors of the engine configuration. According to oneembodiment only one pressure unit is necessary, namely the one determining said thirdpressure value. According to another example embodiment only two pressure sensors arerequired, namely the one determining said first pressure value and the one determining said third pressure value.
Said engine configuration may comprise an internal combustion engine or an emissioncontrol system. Hereby, regarding said combustion engine said liquid substance may be aliquid fuel substance, e.g. diesel, ethanol, gasoline. Hereby, regarding said emission controlsystem said liquid substance may be a liquid reducing agent substance. The method is thusapplicable to various systems of e.g. a motor vehicle. The method is thus versatile.
Alternatively, said system may be applicable for cabin-heating/dieseI-heaters.
By setting said valve configuration in said second state said second pump unit isdisconnected and said first filter unit and said second filter unit are hereby connected in series, which allows efficient application ofthe inventive method.
The method may comprise the step of: - providing an estimation for parasitic pressure losses in said internal combustion engineconfiguration from said first pump unit to downstream of said second filter unit; and including said parasitic pressure losses when calculating said first pressure drop.
Hereby a more accurate diagnosis of said first filter unit and/or said second filter unit may beperformed according to the inventive method. Said parasitic pressure losses may be predetermined.The method may comprise the step of: - determining said second pressure value on the basis of operation of said second pump unitwhen said valve configuration is arranged in said first state. Hereby an accurate estimate ofsaid second pressure value may be provided. Bysimulating/calculating/determining/modelling said second pressure value a pressure sensorbeing arranged downstream of said second pump unit may be omitted, which naturally is acost-effective set-up. Said second pressure value may be determined on the basis ofprevailing pump unit operation parameters such as rotational speed and/or prevailing power of said second pump unit.The method may comprise the step of:- determining said first pressure value on the basis of operation of said first pump unit.
Hereby an accurate estimate of said first pressure value may be provided. Bysimulating/calculating/determining/modelling said first pressure value a pressure sensorbeing arranged downstream of said first pump unit may be omitted, which naturally is acost-effective set-up. Said first pressure value may be determined on the basis of prevailingpump unit operation parameters such as rotational speed and/or prevailing power of said first pump unit.The method may comprise the step of: - determining said first pressure drop when said valve configuration is arranged in saidsecond state. This advantageously provides rather simple calculations, which provides fast results and low computational burden of dedicated control units.
The method may comprise the step of: - determining a diagnosis comprising a degree of contamination ofthe filter units as a basisfor determining a remaining time period to service of said filter units. This advantageouslyprovides accurate estimations regarding when to clean or exchange said filter units, which inturn allows to decide if maintenance should be performed at a given service occasion or if it possible to post-phone said maintenance to a subsequent planned service occasion.
According to one embodiment there is provided a system for diagnosing status of a firstfilter unit and a second filter unit in an internal combustion engine configuration, said engineconfiguration comprising a first tank unit for holding a liquid substance and a second tankunit for holding said liquid substance, a first pump unit for providing liquid substance fromsaid first tank unit to said second tank unit, a second pump unit for providing liquidsubstance from said second tank unit for consumption within said engine configuration,wherein said first filter unit is arranged downstream of said first pump unit and said secondfilter unit is arranged downstream of said second pump unit, and a valve configuration,which in a first state provides operation of at least the second pump unit and in a second state provides operation of only said first pump unit, comprising: - means for determining a first pressure value downstream of said first pump unit; - means for determining a second pressure value downstream of said second pump unit; - means for determining a third pressure value downstream of said second filter unit; - means for determining a second pressure drop over said second filter unit as a difference between said second pressure value and said third pressure value; - means for determining a first pressure drop over said first filter unit from a functionspecifying a difference between said third pressure value and said first pressure value and said second pressure drop; and - means for taking said first pressure drop over said first filter unit and said second pressure drop over said second filter unit as a basis for diagnosis for the respective filter units.
The system may comprise: - means for providing an estimation for parasitic pressure losses in said internal combustionengine configuration from said first pump unit to downstream of said second filter unit; and including said parasitic pressure losses when calculating said first pressure drop.The system may comprise: - means for determining said second pressure value on the basis of operation of said second pump unit when said valve configuration is arranged in said first state.The system may comprise: - means for determining said first pressure value on the basis of operation of said first pump unit.The system may comprise: - means for determining said first pressure drop when said valve configuration is arranged in said second state.The system may comprise: - means for determining a diagnosis comprising a degree of contamination ofthe filter units as a basis for determining a remaining time period to service of said filter units.
According to an aspect of the invention there is provided a vehicle comprising a systemaccording to what is presented herein. Said vehicle may be any from among a truck, bus orpassenger car. According to an embodiment the system is provided for a marine application or industrial application.
According to an aspect of the invention there is provided a computer program for diagnosingstatus of a first filter unit and a second filter unit in an internal combustion engineconfiguration, wherein said computer program comprises program code for causing anelectronic control unit or a computer connected to the electronic control unit to performanyone of the method steps depicted herein, when run on said electronic control unit or said computer.
According to an aspect of the invention there is provided a computer program for diagnosingstatus of a first filter unit and a second filter unit in an internal combustion engineconfiguration, wherein said computer program comprises program code stored on acomputer-readable medium for causing an electronic control unit or a computer connected to the electronic control unit to perform anyone ofthe method steps depicted herein.
According to an aspect of the invention there is provided a computer program for diagnosingstatus of a first filter unit and a second filter unit in an internal combustion engineconfiguration, wherein said computer program comprises program code stored on acomputer-readable medium for causing an electronic control unit or a computer connectedto the electronic control unit to perform anyone ofthe method steps depicted herein, when run on said electronic control unit or said computer.
According to an aspect of the invention there is provided a computer program productcontaining a program code stored on a computer-readable medium for performing anyoneof the method steps depicted herein, when said computer program is run on an electronic control unit or a computer connected to the electronic control unit.
According to an aspect of the invention there is provided a computer program productcontaining a program code stored non-volatile on a computer-readable medium forperforming anyone ofthe method steps depicted herein, when said computer program is run on an electronic control unit or a computer connected to the electronic control unit.
Further objects, advantages and novel features of the present invention will becomeapparent to one skilled in the art from the following details, and also by putting theinvention into practice. Whereas the invention is described below, it should be noted that itis not confined to the specific details described. One skilled in the art having access to theteachings herein will recognise further applications, modifications and incorporations in other fields, which are within the scope of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS For fuller understanding of the present invention and its further objects and advantages, thedetailed description set out below should be read in conjunction with the accompanyingdrawings, in which the same reference notations denote similar items in the various diagrams, and in which: Figure 1 schematically illustrates a vehicle according to an embodiment ofthe invention;Figure 2 schematically illustrates a fuel supply system according to an embodiment of theinvention; Figure 3a is a schematic flowchart of a method according to an embodiment ofthe invention; Figure 3b is a more detailed schematic flowchart of a method according to an embodiment of the invention; and Figure 4 schematically illustrates a computer according to an embodiment of the invention.
DETAILED DESCRIPTION Figure 1 depicts a side view of a vehicle 100. The exemplified vehicle 100 comprises a tractorunit 110 and a trailer 112. The vehicle 100 may be a heavy vehicle, e.g. a truck or a bus. lt may alternatively be a car. lt should be noted that the inventive system is applicable to various vehicles, such as e.g. amining machine, tractor, dumper, wheel-loader, platform comprising an industrial robot,forest machine, earth mover, road construction vehicle, road planner, emergency vehicle or a tracked vehicle. lt should be noted that the invention is suitable for application in various systems comprisinga similar setup as depicted herein, e.g. a first and second tank for holding a liquid, a first andsecond pump for providing said liquid from the first tank to the second tank and from said second tank to an engine configuration, two filter units and a certain valve configuration allowing said filter units to be in fluid communication and intermittently shortcutting saidsecond pump. lt should be noted that the invention is suitable for application with anycombustion engine is therefore not confined to combustion engines of motor vehicles. Theinnovative method and the innovative system in one aspect of the invention are well suitedto other platforms which comprise a combustion engine system than motor vehicles, e.g. watercraft. The watercraft may be of any kind, e.g. motor boats, steamers, ferries or ships.
The innovative method and the innovative system according to one aspect of the inventionare also well suited to, for example, systems which comprise industrial combustion engines and/or combustion engine-powered industrial robots.
The innovative method and the innovative system according to one aspect of the inventionare also well suited to various kinds of power plants, e.g. an electric power plant which comprises a combustion engine-powered generator.
The innovative method and the innovative system are also well suited to various combustion engine systems.
The term ”link” refers herein to a communication link which may be a physical connectionsuch as an opto-electronic communication line, or a non-physical connection such as a wireless connection, e.g. a radio link or microwave link.
Figure 2 schematically illustrates a fuel supply system for a combustion engine configuration299. According to this embodiment said combustion engine configuration comprises aninternal combustion engine 290 to which said fuel is supplied. lt should be noted that eventhough it is hereby depicted a fuel supply system for a combustion engine configuration asimilar set-up for e.g. an SCR-system may be provided. According to this embodiment aliquid reducing agent may be provided to said combustion engine configuration, saidconfiguration comprising an exhaust gas pipe arrangement to which said reducing agent is provided for emission control by means of an SCR-unit. 11 A first tank unit 220 is arranged to hold a liquid fuel Substance, e.g. diesel, gasoline or anethanol based fuel. Said first tank unit 220 may present a volume of e.g. 1000 litres. Said firsttank unit 220 may be denoted main tank or primary tank. A level sensor 235 is arranged insaid first tank unit 220. Said level sensor 235 is arranged to continuously measure aprevailing level L1 of said liquid fuel substance in said first tank unit 220. Said level sensor235 may be arranged for communication with a first control unit 200 via any suitable means,e.g. a link (not shown). Hereby it is illustrated that said first tank unit 220 is holding a volume of said fuel substance presenting said prevailing level L1.
A first passage P231, such as a pipe arrangement, is arranged to convey said liquid fuelsubstance from said first tank unit 220 to a first pump unit 230. Said first pump unit 230 maybe any suitable pump unit. Said first pump unit 230 is arranged to suck said fuel substancefrom said first tank unit 220, pressurize said fuel substance, and provide said fuel substanceto a first filter unit 240. Hereby said first filter unit 240 is arranged to filter said fuelsubstance. Said fuel substance is hereby conveyed via a second pipe P241 to a second tankunit 250. A prevailing pressure of said second fuel tank unit 250 may be equal toatmospheric pressure. Said second tank unit 250 may be arranged to hold e.g. 25 or 50 litres.Said second fuel tank unit 250 may be denoted auxiliary tank or secondary tank.
According to an embodiment a first pressure sensor unit 235 is provided to continuously orintermittently measure a prevailing first pressure value P1 of said liquid fuel substance. Saidfirst pressure sensor unit 235 is arranged to measure said first pressure value P1downstream of said first pump unit 230 and upstream of said first filter unit 240. Said firstpressure sensor unit 235 is arranged for communication with said first control unit 200 via alink L235. Said first pressure sensor unit 235 is arranged to continuously or intermittentlysend signals S235 comprising information about said detected prevailing first pressure valueP1 to said first control unit 200 via said link L235. A pressure drop over said first filter unit 240 is denoted a first pressure drop AP1.
A second passage P271, such as a pipe arrangement, is arranged to convey said liquid fromsaid second tank unit 250 to a second pump unit 270. Said second pump unit 270 may beany suitable pump unit. Said second pump unit 270 is arranged to suck said fuel substance from said second tank unit 250, pressurize said fuel substance, and provide said fuel 12 Substance to a second filter unit 280. Hereby it is illustrated that said second tank unit 250 isholding a volume of said fuel substance presenting a level L2. Said second pump unit 270may be arranged in said second fuel tank unit 250. Alternatively said second fuel tank unit 270 is arranged outside said second fuel tank unit 250.
Said second pump unit 270 is arranged to pressurize said fuel substance to a secondpressure value P2. This second pressure value P2 is prevailing downstream of said secondpump unit 270 and upstream of said second filter unit 280. A pressure drop over said second filter unit 280 is denoted a second pressure drop AP2.
According to an embodiment a second pressure sensor unit 285 is provided for continuouslyor intermittently measuring a prevailing third pressure value P3 of said liquid fuel substance.Said second pressure sensor unit 285 is arranged to measure said third pressure value P3downstream of said second filter unit 280 and upstream of an internal combustion engine290. Said second pressure sensor unit 285 is arranged for communication with said firstcontrol unit 200 via a link L285. Said second pressure sensor unit 285 is arranged tocontinuously or intermittently send signals S285 comprising information about said detected prevailing third pressure value P3 to said first control unit 200.
Said first control unit 200 is according to one example arranged to control operation of saidfirst pump unit 230 and said second pump unit 270 via any suitable means. Said first controlunit 200 is arranged to continuously or intermittently determine at least one prevailingoperation condition parameter of said first pump unit 230. Said first control unit 200 isarranged to continuously or intermittently determine at least one prevailing operationcondition parameter of said second pump unit 270. Said prevailing operation condition parameters may comprise information about e.g. rotational speed of said pump units.
Said first control unit 200 is arranged to determine/estimate/calculate/model said firstpressure value P1. Said first control unit 200 is arranged todetermine/estimate/calculate/model said first pressure value P1 on the basis of said determined at least one operation condition parameter of said first pump unit 230. Said first 13 control unit 200 is arranged to determine/estimate/calculate/model said first pressure value P1 on the basis of operation of said first pump unit 230.
Said first control unit 200 is arranged to determine/estimate/calculate/model said secondpressure value P2. Said first control unit 200 is arranged todetermine/estimate/calculate/model said second pressure value P2 on the basis of saiddetermined at least one operation condition parameter of said second pump unit 270. Saidfirst control unit 200 is arranged to determine/estimate/calculate/model said second pressure value P2 on the basis of operation of said second pump unit 270.
A valve configuration 260 is arranged for controlling a flow of said liquid fuel substance. Saidfirst control unit 200 is arranged to control operation of said valve configuration 260 via anysuitable means, e.g. a link (not shown).
Hereby said first control unit 200 is arranged to set said valve configuration 260 in a state Aallowing said fuel substance to flow from said first filter unit 240 into said second tank unit250 via said second passage P241 and allowing said fuel substance to flow from said secondtank unit 250 to said second pump unit 270 and further on to said second filter unit 280 viathe third passage P271. Thus, in this state A the valve configuration 260 allows flows in saidsecond passage P241 and said third passage P271. lf said valve configuration 260 is set in said state A operation of at least said second pump unit 270 is provided.
Hereby said first control unit 200 is arranged to set said valve configuration 260 in a state Bonly allowing said fuel substance to flow from said second tank unit 250 to said secondpump unit 270 and further on to said second filter unit 280 via the third passage P271. Thus,in this state B the valve configuration 260 allows flow in said third passage P271 only. lf saidvalve configuration 260 is set in said state B operation of only said second pump unit 270 is provided.
Hereby said first control unit 200 is arranged to set said valve configuration 260 in a state Callowing said fuel substance to flow from said first filter unit 240 directly to said second filterunit 280 via said valve configuration 260. Thus, in this state C the valve configuration 260 allows flow in said second passage P241 via said valve configuration 260 to said third 14 passage P271 downstream of said second pump unit 270. lf said valve configuration 260 is set in said state C operation of only said first pump unit 230 is provided. lf said valve configuration is set in said state C, the following equation can be used: P3=P1 + AP1 + AP2 + Ppar Wherein: - P3 is a prevailing pressure in the fourth passage P281. The pressure value P3 may bedetermined by means of said second pressure sensor 285; - P1 is a prevailing pressure in the second passage P231, downstream of said firstpump unit 230 and upstream of said first filter unit 240. The pressure value P1 maybe determined by means of said first pressure sensor 235 and/or by means of saidfirst control unit 200 being arranged fordetermining/estimating/calculating/modelling said first pressure value P1; - AP1 is the pressure drop over said first filter unit 240; - AP2 is the pressure drop over said second filter unit 280. AP2 is defined as P3-P2; and - Ppar is parasitic pressure losses in the passages downstream of said first pump unit230 to said combustion engine 290, when said valve configuration is set in state C.
Ppar may be determined empirically. Ppar may be a predetermined pressure value.
Since all terms but AP1 are predetermined or may be determined:P3=P1 + AP1 + AP2 + PparAP1= P3 - P1 - AP2 - Ppar According to one embodiment said parasitic pressure losses are disregarded, thus: AP1= P3 - P1 - APZ According to an embodiment of the invention said second pressure value P2 is determinedby means of said first control unit 200 on the basis of operation conditions parameters of said second pump unit 280 when said valve configuration 260 is set in said state A or B.
A pressure value corresponding to said parasitic losses Ppar may be stored in a memory of the first control unit 200.
Hereby, according to one embodiment, said first control unit 200 is arranged for determiningsaid first pressure drop APl over said first filter unit 240 from a function specifying adifference between said third pressure value P3 and said first pressure value P1, said second pressure drop AP2 and said parasitic pressure losses Ppar.
Hereby, according to one embodiment, said first control unit 200 is arranged for determiningsaid first pressure drop APl over said first filter unit 240 from a function specifying adifference between said third pressure value P3 and said first pressure value P1, said second pressure drop AP2 and said parasitic pressure losses Ppar.
Said first control unit 200 is arranged to take said first pressure drop APl over said first filterunit 240 and said second pressure drop AP2 over said second filter unit 280 as a basis fordiagnosis for the respective filter units. Said first control unit 200 is arranged to provide anestimation for parasitic pressure losses Ppar in said internal combustion engineconfiguration 299 from said first tank unit 220 to downstream of said second filter unit 280and including said parasitic pressure losses Ppar when calculating said first pressure dropAPl. Said first control unit 200 may be arranged to provide an estimation for parasiticpressure losses Ppar in said internal combustion engine configuration 299 from downstreamof said first pump unit 230 to downstream of said second filter unit 280 and including said parasitic pressure losses Ppar when calculating said first pressure drop APl.
By determining a first differential pressure APl over said first filter unit 240 a diagnosis maybe performed regarding said first filter unit 240. By determining a second differentialpressure AP2 over said first filter unit 280 a diagnosis may be performed regarding saidsecond filter unit 280. Said respective differential pressure is proportional to a degree of contamination. 16 lf said differential pressure is relatively high, said filter unit is presenting a relatively highdegree of contamination. This means that said filter unit in this case should be cleaned or exchanged relatively soon. lf said differential pressure is relatively low, said filter unit is presenting a relatively lowdegree of contamination. This means that said filter unit in this case should does not necessarily has to be cleaned or exchanged relatively soon.
According to one embodiment said first control unit 200 is arranged to diagnose only saidfirst filter unit 240 on the basis of said determined first pressure drop APl. According to oneembodiment said first control unit 200 is arranged to diagnose said first filter unit 240 on thebasis of said determined first pressure drop APl and to diagnose said second filter 280 on the basis of said determined second pressure drop AP2.
A second control unit 210 is arranged for communication with the first control unit 200 via alink L210. lt may be releasably connected to the first control unit 200. lt may be a controlunit external to the vehicle 100. lt may be adapted to performing the innovative stepsaccording to the invention. lt may be used to cross-load software to the first control unit 200,particularly software for applying the innovative method. lt may alternatively be arrangedfor communication with the first control unit 200 via an internal network on board thevehicle. lt may be adapted to performing functions corresponding to those of the firstcontrol unit 200, such as taking said first pressure drop APl over said first filter unit 240 andsaid second pressure drop AP2 over said second filter unit 280 as a basis for diagnosis for the respective filter units.
Figure 3a schematically illustrates a flow chart of a method for diagnosing status of a firstfilter unit 240 and a second filter unit 280 in an internal combustion engine configuration299, said engine configuration 299 comprising a first tank unit 220 for holding a liquidsubstance and a second tank unit 250 for holding said liquid substance, a first pump unit 230for providing liquid substance from said first tank unit 220 to said second tank unit 250, a second pump unit 270 for providing liquid substance from said second tank unit 250 for 17 consumption within said engine configuration 299, wherein said first filter unit 240 isarranged downstream of said first pump unit 230 and said second filter unit 280 is arrangeddownstream of said second pump unit 270, and a valve configuration 260, which in a firststate provides operation of at least the second pump unit 270 and in a second state providesoperation of only said first pump unit 230. The method comprises a first method step s301.
The method step s301 comprises the steps of: - determining a first pressure value P1 downstream of said first pump unit 230; - determining a second pressure value P2 downstream of said second pump unit 270; - determining a third pressure value P3 downstream of said second filter unit 280; - determining a second pressure drop AP2 over said second filter unit 280 as a difference between said second pressure value P2 and said third pressure value P3; - determining a first pressure drop APl over said first filter unit 240 from a functionspecifying a difference between said third pressure value P3 and said first pressure value P1 and said second pressure drop AP2; and - taking said first pressure drop APl over said first filter unit 240 and said second pressure drop AP2 over said second filter unit 280 as a basis for diagnosis for the respective filter units.
After the method step s301 the method ends/is returned.
Figure 3b schematically illustrates a flow chart of a method for diagnosing status of a firstfilter unit 240 and a second filter unit 280 in an internal combustion engine configuration299. Said engine configuration 299 comprises a first tank unit 220 for holding said liquidsubstance and a second tank unit 250 for holding said liquid substance, a first pump unit 230for providing liquid substance from said first tank unit 220 to said second tank unit 250, asecond pump unit 270 for providing liquid substance from said second tank unit 250 forconsumption within said engine configuration 299, wherein said first filter unit 240 isarranged downstream of said first pump unit 230 and said second filter unit 280 is arranged downstream of said second pump unit 270, and a valve configuration 260, which in a first 18 state provides operation of at least the second pump unit 270 and in a second state provides operation of only said first pump unit 230. The method comprises a first method step s310.|nitia||y said valve configuration 260 is set in said state A or said state B.
The method step s310 comprises the step of determining a third pressure value P3downstream of said second filter unit 280. This is performed by means of said second pressure sensor unit 285. After the step s310 a subsequent step s320 is performed.
The method step s320 comprises the step of determining a second pressure value P2downstream of said second pump unit 270. This may be performed by means of said firstcontrol unit 200. Hereby said second pressure value P2 isdetermined/estimated/calculated/modelled on the basis of prevailing operation conditionparameters of said second pump unit 270. Said parameters may comprise e.g. rotationalspeed and/or prevailing power of said second pump unit 270. Hereby a map stored in amemory of the first control unit 200 may be used so as to correlate said rotational speedand/or said prevailing power with an associated pressure P2. After the step s320 a subsequent step s330 is performed.
The method step s330 comprises the step of determining a second pressure drop AP2 oversaid second filter unit 280 as an absolute value of a difference between said second pressurevalue P2 and said third pressure value P3. This may be performed by means of said firstcontrol unit 200. After the second pressure drop AP2 over said second filter unit 280 hasbeen determined said valve configuration 260 is set in said third state C. Hereby said secondpump unit 270 is shut off and said first filter unit 240 and said second filter unit 280 is thusarranged in series via said valve configuration 260. After the step s330 a subsequent step s340 is performed.
The method step s340 comprises the step of determining a first pressure value P1 downstream of said first pump unit 230. This may according to one embodiment be 19 performed by means of said first pressure sensor 235. Alternatively, this may be performedby means of said first control unit 200. According to this alternative embodiment said firstpressure sensor 235 may be omitted from the engine configuration 299, thus presenting a cheaper system, yet accurate. After the step s340 a subsequent step s350 is performed.
The method step s350 comprises the step of determining a first pressure drop APl over saidfirst filter unit 240 from a function specifying a difference between said third pressure value P3 and said first pressure value P1 and said second pressure drop AP2.Hereby the state of pressures within the system gives: AP1= P3 - P1 - APZ According to one embodiment said parasitic pressure losses are included, thus:AP1= P3 - P1 - AP2 - Ppar Where said pressure losses Ppar is a predetermined constant.
After the step s350 a subsequent step s360 is performed.
The method step s360 comprises the step of taking said first pressure drop APl over saidfirst filter unit 240 and said second pressure drop AP2 over said second filter unit 280 as abasis for diagnosis for the respective filter units 240, 280. This may be performed by means of said first control unit 200.
According to one embodiment a result of said diagnosis may be presented to an operator ofthe vehicle 100 by any suitable means, e.g. comprising a presentation screen. Said result ofsaid diagnosis may be available to read out from said first control unit 200 at a servicestation. Said result may be used so as to determine if, and in that case, when each of said first filter unit 240 and said second filter unit 280 should be cleaned or replaced.
After the method step s360 the method ends/is returned.
Figure 4 is a diagram of one version of a device 500. The control units 200 and 210 describedwith reference to Figure 2 may in one version comprise the device 500. The device 500comprises a non-volatile memory 520, a data processing unit 510 and a read/write memory550. The non-volatile memory 520 has a first memory element 530 in which a computerprogram, e.g. an operating system, is stored for contro||ing the function of the device 500.The device 500 further comprises a bus controller, a serial communication port, I/O means,an A/D converter, a time and date input and transfer unit, an event counter and aninterruption controller (not depicted). The non-volatile memory 520 has also a second memory element 540.
The computer program P comprises routines for diagnosing status of a first filter unit 240and a second filter unit 280 in an internal combustion engine configuration 299, said engineconfiguration 299 comprising a first tank unit 220 for holding a liquid substance and asecond tank unit 250 for holding said liquid substance, a first pump unit 230 for providingliquid substance from said first tank unit 220 to said second tank unit 250, a second pumpunit 270 for providing liquid substance from said second tank unit 250 for consumptionwithin said engine configuration 299, wherein said first filter unit 240 is arrangeddownstream of said first pump unit 230 and said second filter unit 280 is arrangeddownstream of said second pump unit 270, and a valve configuration 260, which in a firststate provides operation of at least the second pump unit 270 and in a second state provides operation of only said first pump unit 230.
The computer program P may comprise routines for determining said first pressure value P1downstream of said first pump unit 230 and upstream of said first filter unit 240. Thecomputer program P may comprise routines for determining said first pressure value P1downstream of said first pump unit 230 on the basis of prevailing operation parameter values of said first pump unit 240.
The computer program P may comprise routines for determining a second pressure value P2downstream of said second pump unit 270 and upstream of said second filter unit 280. Thecomputer program P may comprise routines for determining said second pressure value P2downstream of said second pump unit 270 and upstream of said second filter unit 280 on the basis of prevailing operation parameter values of said second pump unit 270. 21 The computer program P may comprise routines for determining a third pressure value P3downstream of said second filter unit 280. This may be performed on the basis of information content of said signal S285.
The computer program P may comprise routines for determining a second pressure dropAP2 over said second filter unit 280 as a difference between said second pressure value P2 and said third pressure value P3.
The computer program P may comprise routines for determining a first pressure drop APlover said first filter unit 240 from a function specifying a difference between said third pressure value P3, said first pressure value P1 and said second pressure drop AP2.
The computer program P may comprise routines for taking said first pressure drop APl oversaid first filter unit 240 and said second pressure drop AP2 over said second filter unit 280 as a basis for diagnosis for the respective filter units.
The computer program P may comprise routines for providing an estimation for parasiticpressure losses in said internal combustion engine configuration 299 from said first pumpunit 230 to downstream of said second filter unit 280 and routines for including said parasitic pressure losses when calculating said first pressure drop APl.
The computer program P may comprise routines for determining said second pressure valueP2 on the basis of operation of said second pump unit 270 when said valve configuration 260 is arranged in said first state.
The computer program P may comprise routines for determining said first pressure value P1 on the basis of operation of said first pump unit 230.
The computer program P may comprise routines for determining said first pressure drop APl when said valve configuration 260 is arranged in said second state.
The computer program P may comprise routines for determining a diagnosis comprising adegree of contamination of the filter units as a basis for determining a remaining time period to service of said filter units.
The program P may be stored in an executable form or in compressed form in a memory 560 and/or in a read/write memory 550. 22 Where it is stated that the data processing unit 510 performs a certain function, it meansthat it conducts a certain part of the program which is stored in the memory 560 or a certain part ofthe program which is stored in the read/write memory 550.
The data processing device 510 can communicate with a data port 599 via a data bus 515.The non-volatile memory 520 is intended for communication with the data processing unit510 via a data bus 512. The separate memory 560 is intended to communicate with the dataprocessing unit via a data bus 511. The read/write memory 550 is arranged to communicatewith the data processing unit 510 via a data bus 514. The links L210, L235 and L285, for example, may be connected to the data port 599 (see Figure 2).
When data are received on the data port 599, they are stored temporarily in the secondmemory element 540. When input data received have been temporarily stored, the data processing unit 510 will be prepared to conduct code execution as described above.
Parts of the methods herein described may be conducted by the device 500 by means of thedata processing unit 510 which runs the program stored in the memory 560 or theread/write memory 550. When the device 500 runs the program, methods herein described are executed.
The foregoing description of the preferred embodiments of the present invention isprovided for illustrative and descriptive purposes. lt is not intended to be exhaustive, nor tolimit the invention to the variants described. I\/|any modifications and variations willobviously suggest themselves to one skilled in the art. The embodiments have been chosenand described in order to best explain the principles of the invention and their practicalapplications and thereby make it possible for one skilled in the art to understand theinvention for different embodiments and with the various modifications appropriate to the intended use.
The components and features specified above may within the framework of the invention be combined between different embodiments specified.

Claims (16)

23 Claims
1. A method for diagnosing status of a first filter unit (240) and a second filter unit (280) inan internal combustion engine configuration (299), said engine configuration (299)comprising a first tank unit (220) for holding a liquid substance and a second tank unit (250)for holding said liquid substance, a first pump unit (230) for providing liquid substance fromsaid first tank unit (220) to said second tank unit (250), a second pump unit (270) forproviding liquid substance from said second tank unit (250) for consumption within saidengine configuration (299), wherein said first filter unit (240) is arranged downstream of saidfirst pump unit (230) and said second filter unit (280) is arranged downstream of said secondpump unit (270), and a valve configuration (260), which in a first state provides operation ofat least the second pump unit (270) and in a second state provides operation of only said first pump unit (230), comprising the steps of: - determining a first pressure value (P1) downstream of said first pump unit (230); - determining a second pressure value (P2) downstream of said second pump unit (270); - determining a third pressure value (P3) downstream of said second filter unit (280); - determining a second pressure drop (AP2) over said second filter unit (280) as a difference between said second pressure value (P2) and said third pressure value (P3); - determining a first pressure drop (APl) over said first filter unit (240) from a functionspecifying a difference between said third pressure value (P3) and said first pressure value (P1) and said second pressure drop (AP2); and - taking said first pressure drop (APl) over said first filter unit (240) and said second pressuredrop (AP2) over said second filter unit (280) as a basis for diagnosis for the respective filter units (240, zso).
2. The method according to claim 1, comprising the step of: - providing an estimation for parasitic pressure losses (Ppar) in said internal combustion engine configuration (299) from said first pump unit (230) to downstream of said second 24 filter unit (280); and including said parasitic pressure losses (Ppar) when calculating said first pressure drop (APl).
3. The method according to claim 1 or 2, comprising the step of: - determining said second pressure value (P2) on the basis of operation of said second pump unit (270) when said valve configuration (260) is arranged in said first state.
4. The method according to anyone of claims 1-3, comprising the step of: - determining said first pressure value (P1) on the basis of operation of said first pump unit (230).
5. The method according to anyone of claims 1-4, comprising the step of: - determining said first pressure drop (AP1)when said valve configuration (260) is arranged in said second state.
6. The method according to anyone of claims 1-5, comprising the step of: - determining a diagnosis comprising a degree of contamination ofthe filter units (240; 280) as a basis for determining a remaining time period to service of said filter units (240; 280).
7. A system for diagnosing status of a first filter unit (240) and a second filter unit (280) in aninternal combustion engine configuration (299), said engine configuration (299) comprising afirst tank unit (220) for holding a liquid substance and a second tank unit (250) for holdingsaid liquid substance, a first pump unit (230) for providing liquid substance from said firsttank unit (220) to said second tank unit (250), a second pump unit (270) for providing liquid substance from said second tank unit (250) for consumption within said engine configuration (299), wherein said first filter unit (240) is arranged downstream of said first pump unit (230)and said second filter unit (280) is arranged downstream of said second pump unit (270),and a valve configuration (260), which in a first state provides operation of at least thesecond pump unit (270) and in a second state provides operation of only said first pump unit (230), comprising: - means (200; 210; 500; 235) for determining a first pressure value (P1) downstream of said first pump unit (230); - means (200; 210; 500) for determining a second pressure value (P2) downstream of said second pump unit (270); - means (200; 210; 500; 285) for determining a third pressure value (P3) downstream of said second filter unit (280); - means (200; 210; 500) for determining a second pressure drop (AP2) over said second filterunit (280) as a difference between said second pressure value (P2) and said third pressure value (P3); - means (200; 210; 500) for determining a first pressure drop (APl) over said first filter unit(240) from a function specifying a difference between said third pressure value (P3) and said first pressure value (P1) and said second pressure drop (AP2); and - means (200; 210; 500) for taking said first pressure drop (APl) over said first filter unit (240)and said second pressure drop (AP2) over said second filter unit (280) as a basis for diagnosis for the respective filter units (240; 280).
8. The system according to claim 7, comprising: - means (200; 210; 500) for providing an estimation for parasitic pressure losses (Ppar) insaid internal combustion engine configuration (299) from said first pump unit (230) todownstream of said second filter unit (280); and including said parasitic pressure losses (Ppar) when calculating said first pressure drop (APl). 26
9. The system according to claim 8 or 9, comprising: - means (200; 210; 500) for determining said second pressure value (P2) on the basis ofoperation of said second pump unit (270) when said valve configuration (260) is arranged in said first state.
10. The system according to anyone of claims 7-9, comprising: - means (200; 210; 500) for determining said first pressure value (P1) on the basis of operation of said first pump unit (230).
11. The system according to anyone of claims 7-10, comprising: - means (200; 210; 500) for determining said first pressure drop (AP1) when said valve configuration (260) is arranged in said second state.
12. The system according to anyone of claims 7-11, comprising: - means (200; 210; 500) for determining a diagnosis comprising a degree of contamination ofthe filter units (240; 280) as a basis for determining a remaining time period to service of said filter units (240; 280).
13. A vehicle (100; 110) comprising a system according to anyone of claims 7-12.
14. The vehicle (100; 110) according to claim 13, which vehicle is any from among a truck, bus or passenger car.
15. A computer program (P) for, wherein said computer program (P) comprises programcode for causing an electronic control unit (200; 500) or a computer (210; 500) connected to the electronic control unit (200; 500) to perform the steps according to any of the claims 1-6. 27
16. A computer program product containing a program code stored on a computer-readablemedium for performing method steps according to any of claims 1-6, when said computerprogram is run on an electronic control unit (200; 500) or a computer (210; 500) connected to the electronic control unit (200; 500).
SE1651034A 2016-07-11 2016-07-11 A system and a method for diagnosing the status of a first filter unit and a second filter unit in a combustion engine configuration SE540049C2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020060471A1 (en) * 2018-09-21 2020-03-26 Scania Cv Ab Method for diagnosing a fuel filter, and control device therefor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020060471A1 (en) * 2018-09-21 2020-03-26 Scania Cv Ab Method for diagnosing a fuel filter, and control device therefor

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