SE1451292A1 - A method and system for controlling the operation of a powersource of a vehicle - Google Patents

A method and system for controlling the operation of a powersource of a vehicle Download PDF

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Publication number
SE1451292A1
SE1451292A1 SE1451292A SE1451292A SE1451292A1 SE 1451292 A1 SE1451292 A1 SE 1451292A1 SE 1451292 A SE1451292 A SE 1451292A SE 1451292 A SE1451292 A SE 1451292A SE 1451292 A1 SE1451292 A1 SE 1451292A1
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SE
Sweden
Prior art keywords
power
torque
power source
vehicle
predetermined amount
Prior art date
Application number
SE1451292A
Other languages
Swedish (sv)
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SE539210C2 (en
Inventor
Johan Falkhäll
Nils-Gunnar Vågstedt
Original Assignee
Scania Cv Ab
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 Scania Cv Ab filed Critical Scania Cv Ab
Priority to SE1451292A priority Critical patent/SE539210C2/en
Priority to DE102015013536.8A priority patent/DE102015013536A1/en
Publication of SE1451292A1 publication Critical patent/SE1451292A1/en
Publication of SE539210C2 publication Critical patent/SE539210C2/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
    • B60W30/18—Propelling the vehicle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/08—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of electric propulsion units, e.g. motors or generators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D45/00—Electrical control not provided for in groups F02D41/00 - F02D43/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2710/00—Output or target parameters relating to a particular sub-units
    • B60W2710/06—Combustion engines, Gas turbines
    • B60W2710/0666—Engine torque
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2710/00—Output or target parameters relating to a particular sub-units
    • B60W2710/24—Energy storage means
    • B60W2710/242—Energy storage means for electrical energy
    • B60W2710/244—Charge state
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/18—Control of the engine output torque
    • F02D2250/22—Control of the engine output torque by keeping a torque reserve, i.e. with temporarily reduced drive train or engine efficiency

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • General Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Hybrid Electric Vehicles (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

29 ABSTRACT The invention relates to a method for controlling the operation of a power source (230) of a vehicle (100), comprising the steps of: - providing (s410) a maximum torque (T1max) and maximum power (P1max) of said power source (230) for a certain power source speed interval (N1-N2; N3-N4); - providing (s420) a new maximum torque (T2) and new maximum power (P2) of said powersource (230) for a certain power source speed interval (N1-N2; N3-N4) available forpropulsion of said vehicle (100) and operation of torque/power consuming units (291; 292; 293) of the vehicle (100); and - reserving (s430) a predetermined amount of torque and power of said power source (230)for at least a portion of said power source speed interval (N1-N2; N3-N4) in addition to saidnew maximum torque (T2max) and new maximum power (P2max), respectively, for operation of torque/power consuming units (291; 292; 293) of the vehicle (100) only. The invention relates also to a computer program product comprising program code (P) for acomputer (200; 210) for implementing a method according to the invention. The inventionrelates also to a system for controlling the operation of a power source (230) of a vehicle (100) and a vehicle (100) equipped with the system. Figure 3a for publication

Description

A method and system for controlling the operation of a power source of a vehicle TECHNICAL FIELD The present invention relates to a method for controlling the operation of a power source ofa vehicle. Said power source may be a combustion engine. The invention relates also to acomputer program product comprising program code for a computer for implementing amethod according to the invention. lt relates also to a system for controlling the operation of a power source of a vehicle and a vehicle equipped with the system.
BACKGROUN D Vehicles of today use torque and power generated by a power source, e.g. a combustionengine, for propulsion of the vehicle as well as driving a number of torque/power consuming units, e.g. a motor fan or an AC arrangement on-board said vehicle.
Depending on how the vehicle is driven, as well as temperature of ambient air, carried loadand topology of a travel path ofthe vehicle, prevailing load of said torque/power consumingunits and potential energy storage means is varying over time. lt may arises a situationwhere generated torque/power is not sufficient for both propelling said torque/powerconsuming units and propelling said vehicle according to prevailing demands. A driver maythus experience that the capacity of said power source of said vehicle is not sufficient. The behaviour of current systems is thus not reliable and predictable.
US 2011015811 relates to a control system of a hybrid vehicle, wherein an acceptable level of stored energy of a battery is maintained.
SUMMARY OF THE INVENTION An object of the present invention is to propose a novel and advantageous method for controlling the operation of a power source of a vehicle.
Another object ofthe invention is to propose a novel and advantageous system and a noveland advantageous computer program for controlling the operation of a power source of a vehicle.
Yet another object of the invention is to propose a method, a system and a computer program for providing increased driver comfort during accelerations of a vehicle.
Yet another object of the invention is to propose an alternative method, an alternativedevice and an alternative computer program for controlling the operation of a power source ofa vehicle.
Some of these objects are achieved with a method for controlling the operation of a powersource of a vehicle according to claim 1. Other objects are achieved with a system according to claim 7. Advantageous embodiments are depicted in the dependent claims.
According to an aspect of the invention there is provided a method for controlling the operation of a power source of a vehicle, comprising the steps of: - providing a maximum torque and power of said power source for a certain power source speed interval; - providing a new maximum torque and new maximum power of said power source for acertain power source speed interval available for propulsion of said vehicle and operation of torque/power consuming units of the vehicle; and - reserving a predetermined amount of torque and power of said power source for at least a portion of said power source speed interval in addition to said new maximum torque and new maximum power, respectively, for operation of torque/power consuming units of the vehicle only.
Hereby is achieved a control for said engine wherein torque and power being reserved fordriving said at least one torque/power consuming unit may be used when necessary,securing adequate operation of said unit and at the same time providing necessary torqueand power for propulsion of said vehicle. Herein a predictable behaviour of said vehicleadvantageously is achieved, particularly during take-off and accelerations demanding fulltorque/power provision. Advantageously the inventive method may be applicable whendriving in steep terrain, carrying heavy load and in warm climate. Hereby reliable operation of for example a motor fan and AC arrangements is provided.
According to an aspect of the invention there is provided a method for controlling theoperation of at least two power sources of a vehicle. According to this embodimentsubstantially the same principles are applied, but a total maximum torque and a totalmaximum power are considered, and a new total maximum torque and a new totalmaximum power are provided, so as to reserve a predetermined amount of torque andpower of said power sources for operation of torque/power consuming units of the vehicle only.The method may comprise the step of: - reserving a predetermined amount of torque and power of said power source for a powersource speed interval running above a certain power source speed value. Said certain power source speed value may be an idle speed of said power source.
The method may comprise the step of: - reserving said predetermined amount of torque of said power source so that saidpredetermined amount regarding torque is decreased with an increased power sourcespeed. Hereby a smooth and adequate provision of said reserved amount of torque is provided.
The method may comprise the step of: - reserving said predetermined amount of power of said power source so that saidpredetermined amount regarding power is substantially unchanged with an increased power source speed. Hereby an adequate amount of reserved power is provided.The method may comprise the step of: - adapting said reserved predetermined amount of torque and power of said power sourcefor at least a portion of said power source speed interval to the overall configuration of saidtorque/power consuming units of the vehicle. Hereby a highly accurate reservedpredetermined amount of torque and power of said power source for at least a portion of said power source speed interval may be determined and implemented.The method may comprise the step of: - providing reserved torque/power for charging an energy storage means associated with ahybrid operation configuration of said vehicle. Hereby said reserved torque and power maybe used for charging said energy storage means when suitable, and at the same timemaintaining desired propulsion of said vehicle. Hereby said energy storage means may berecharged relatively fast, which is particularly advantageous in situations where the vehicle has been operating in a so called Zero Tailpipe Emission mode.
According to an aspect of the invention there is provided a system for controlling the operation of a power source of a vehicle, comprising: - means for providing a maximum torque and maximum power of said power source for a certain power source speed interval; - means for providing a new maximum torque and new maximum power of said powersource for a certain power source speed interval available for propulsion of said vehicle and operation of torque/power consuming units ofthe vehicle; and - means for reserving a predetermined amount of torque and power of said power sourcefor at least a portion of said power source speed interval in addition to said new maximumtorque and new maximum power, respectively, for operation of torque/power consuming units of the vehicle only.
The system may comprise: - means for reserving a predetermined amount of torque and power of said power source for a power source speed interval running above a certain power source speed value.The system may comprise: - means for reserving said predetermined amount of torque of said power source so thatsaid predetermined amount regarding torque is decreased with an increased power source speed.The system may comprise: - means for reserving said predetermined amount of power of said power source so that saidpredetermined amount regarding power is substantially unchanged with an increased power source speed.The system may comprise: - means for adapting said reserved predetermined amount of torque and power of saidpower source for at least a portion of said power source speed interval to the overall configuration of said torque/power consuming units ofthe vehicle.The system may comprise: - means for providing reserved torque/power for charging an energy storage means associated with a hybrid operation configuration of said vehicle.
According to an aspect of the invention there is provided a system for controlling theoperation of at least two power sources of a vehicle. According to this embodimentsubstantially the same principles are applied, but a total maximum torque and a totalmaximum power are considered, and a new total maximum torque and a new totalmaximum power are provided, so as to reserve a predetermined amount of torque andpower of said power sources for operation of torque/power consuming units of the vehicle only.
According to an aspect of the invention there is provided a computer program for controlling the operation of a power source of a vehicle, wherein said computer program comprises program code for causing an electronic control unit or another computer connected to the electronic control unit to perform the steps according to any of the claims 1-6.
According to an aspect of the invention there is provided a computer program for controllingthe operation of a power source of a vehicle, wherein said computer program comprisesprogram code for causing an electronic control unit or a computer connected to the electronic control unit to perform the steps according to any of the claims 1-6.
According to an aspect of the invention there is provided a computer program for controllingthe operation of a power source of a vehicle, wherein said computer program comprisesprogram code for causing an electronic control unit or a computer connected to theelectronic control unit to perform the steps according to any of the claims 1-6, when run on said electronic control unit or said computer.
According to an aspect of the invention there is provided a computer program for controllingthe operation of a power source of a vehicle, wherein said computer program comprisesprogram code stored on a computer-readable medium for causing an electronic control unitor a computer connected to the electronic control unit to perform the steps according to any one of the claims 1-6.
According to an aspect of the invention there is provided a computer program for controllingthe operation of a power source of a vehicle, wherein said computer program comprisesprogram code stored on a computer-readable medium for causing an electronic control unitor a computer connected to the electronic control unit to perform the steps according to any one of the claims 1-6, 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 methodsteps according to any one of claims 1-6, 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 method steps according to any one of c|aims 1-6, 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 method for controlling the operation of an engine of a vehicle, comprising the steps of:- providing a maximum torque and power of said engine for a certain engine speed interval; - providing a new maximum torque and new maximum power of said engine for a certainengine speed interval available for propulsion of said vehicle and operation of torque/power consuming units of the vehicle; and - reserving a predetermined amount of torque and power of said engine for at least aportion of said engine speed interval in addition to said new maximum torque and newmaximum power, respectively, for operation of torque/power consuming units of the vehicle only.The method may comprise the step of: - reserving a predetermined amount of torque and power of said engine for an engine speed interval running above a certain engine speed value.The method may comprise the step of: - reserving said predetermined amount of torque of said engine so that said predetermined amount regarding torque is decreased with an increased engine speed.The method may comprise the step of: - reserving said predetermined amount of power of said engine so that said predetermined amount regarding power is substantially unchanged with an increased engine speed.
The method may comprise the step of: - adapting said reserved predetermined amount of torque and power of said engine for atleast a portion of said engine speed interval to the overall configuration of said torque/power consuming units of the vehicle.
According to an aspect of the invention there is provided a system for controlling the operation of an engine of a vehicle, comprising: - means for providing a maximum torque and power of said engine for a certain engine speed interval; - means for providing a new maximum torque and new maximum power of said engine for acertain engine speed interval available for propulsion of said vehicle and operation of torque/power consuming units of the vehicle; and - means for reserving a predetermined amount of torque and power of said engine for atleast a portion of said engine speed interval in addition to said new maximum torque andnew maximum power, respectively, for operation of torque/power consuming units of the vehicle only.The system may comprise: - means for reserving a predetermined amount of torque and power of said engine for an engine speed interval running above a certain engine speed value.The system may comprise: - means for reserving said predetermined amount of torque of said engine so that said predetermined amount regarding torque is decreased with an increased engine speed.The system may comprise: - means for reserving said predetermined amount of power of said engine so that saidpredetermined amount regarding power is substantially unchanged with an increased engine speed.
The system may comprise: - means for adapting said reserved predetermined amount of torque and power of saidengine for at least a portion of said engine speed interval to the overall configuration of said torque/power consuming units of the vehicle.
The system may comprise: - means for providing reserved torque/power for charging an energy storage means associated with a hybrid operation configuration of said vehicle.
According to an aspect of the invention there is provided a motor vehicle comprising asystem according to whet is described herein. The motor vehicle may be any of a truck, bus OI' Car.
According to an aspect of the present invention there is provided a computer program forcontrolling the operation of a power source of a vehicle, wherein said computer programcomprises a program code for causing an electronic control unit or a computer connected to the electronic control unit to perform the steps according to any one of claims 1-6.
According to an aspect of the invention there is provided a computer program productcomprising a program code stored on a computer readable medium for performing methodsteps according to any one of claims 1-6, when said program code 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 subsystem for the vehicle depicted in Figure 1, accordingto an embodiment of the invention; Figure 3a schematically illustrates a diagram, according to an embodiment of the invention;Figure 3b schematically illustrates a diagram, according to an embodiment of the invention;Figure 4a is a schematic flowchart of a method according to an embodiment of theinvention; Figure 4b is a schematic flowchart of a method according to an embodiment of theinvention; Figure 4c is a more detailed schematic flowchart of a method according to an embodimentofthe invention; and Figure 5 schematically illustrates a computer according to an embodiment ofthe invention.
DETAILED DESCRIPTION OF THE DRAWINGS Figure 1 depicts a side view of a vehicle 100. The exemplified vehicle 100 comprises a tractorunit 110 and a trailer 112. The vehicle may be a heavy vehicle, e.g. a truck or a bus. lt may alternatively be a passenger car. lt should be noted that the invention is applicable for various platforms comprising a powersource, such as a combustion engine or a configuration comprising a battery and powerelectronics/electric machine, and at least one power/torque consuming unit. lt should benoted that the invention is suitable for application in various vehicles and is therefore notconfined to motor vehicles being propelled by a combustion engine. Said power source may comprise a plurality of different power sources, e.g. two combustion engines, or an engine 11 system comprising two combustion engines and an electrical motor/electrical storagemeans. The innovative method and the innovative system in one aspect of the invention arewell suited to other platforms which comprise a power source 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 engines and/or 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 an engine-powered generator.
The innovative method and the innovative system are also well suited to any engine systemwhich comprises a combustion engine and at least one power/torque consuming unit associated thereto, e.g. on a locomotive or some other platform.
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 depicts a parallel hybrid system 299 of the vehicle 100. The parallel hybrid system299 is situated in the tractor unit 110. lt should be noted that even though the invention isaccording to this example is depicted in the form of a parallel hybrid system other configurations are most relevant as well.
The parallel hybrid system 299 comprises a combustion engine 230 which has an outputshaft 235 connected to a clutch 240. The clutch may be any suitable clutch. lt may be asliding clutch with pressure discs and plates. lt may in one version be implemented as a so-called lock-up function in a torque converter in cases where the transmission of the vehicle 100 has an automatic gearbox. The clutch 240 is connected to an input shaft 245 of a 12 gearbox 260. The gearbox 260 has an output shaft 265 connected to a torque distributor 270for conveying torque/power to a number of powered wheels 280 via respective drive shafts 275.
The parallel hybrid system 299 further comprises an electrical machine configurationcomprising an electrical machine 250 associated with the gearbox input shaft 245. Theelectrical machine 250 is connected electrically to an energy store 255. The electricalmachine 250 may in one example be suited to an operating power of 60-120 kW. The energystore 255 may be of any suitable kind. lt may in one example be a battery of any suitablekind, e.g. a lithium ion battery. The battery may alternatively be for example an NiMHbattery. ln another example the energy store may 255 be an electrochemical energy store,e.g. an electrochemical capacitor known as SuperCap. Said energy store 255 is herein exemplified with a battery of conventional kind for parallel hybrid systems. ln one version, the electrical machine 250 is adapted to being supplied with power by saidenergy store 255 and thereby serving as a motor in the vehicle's power train to impartdriving torque/power to the gearbox input shaft 245. ln one version the electrical machine250 is adapted to serving as a generator of the electrical machine configuration and therebycharging the energy store 255 during braking of the vehicle 100. Said electrical machine 250 may typically run alternately as motor and generator. ln the version of this example the battery 255 is connected electrically to an electricalrectifier 253 by a cable L255. The rectifier 253 is adapted to converting DC voltage suppliedfrom the battery via the cable L255 to a desired suitable three-phase voltage. ln alternativeversions of the invention, electrical machines herein described may be run with any desirednumber of phases, e.g. one phase or two phases. The rectifier 253 is adapted to supplyingsaid three-phase voltage to the electrical machine 250 via a cable L253 to power and run theelectrical machine. Said DC voltage may amount to several hundred volts, e.g. 400 volts or 600 volts.
Said electrical machine configuration comprises said electrical machine 250, rectifier 253, battery 255 and necessary connections between them. 13 The rectifier 253 is arranged accordingly so that during braking of the vehicle it converts toDC voltage a three-phase voltage generated from the electrical machine 250 and supplied tothe rectifier 253. The rectifier 253 is arranged to supply said DC voltage to the battery 255 via the cable L255 to charge the battery.
A component configuration comprising the electrical machine 250, the cable L253, therectifier 253, the cable L255 and the energy store 255 is herein called the electrical machineconfiguration. lt should be noted that different versions of said configuration are feasible. lnone version the energy store 255 and the rectifier 253 may be manufactured as anintegrated unit which is connected electrically to the electrical machine 250. ln anotherversion the rectifier 253 and the electrical machine 250 may be manufactured as anintegrated unit which is connected electrically to the energy store 255. ln a third version theenergy store 255, the rectifier 253 and the electrical machine 250 may be manufactured as an integrated unit.
A first control unit 200 is arranged for communication with the engine 230 via a link L230.The first control unit 200 is adapted to controlling the operation of the engine according tostored running routines. lt is for example adapted to guiding an engine's prevailing speed (oroutput shaft torque/power) towards a demanded speed (or demanded output shaft to rque/power).
The first control unit 200 is arranged for communication with the clutch 240 via a link L240.The first control unit 200 is adapted to controlling the operation of the clutch according tostored running routines. lt is for example adapted to opening the clutch 240, sliding the clutch 240 together and closing the clutch 240 according to said stored routines.
The first control unit 200 is arranged for communication with the electrical machine 250 viaa link L250. The first control unit 200 is adapted to controlling the operation of the electricalmachine 250 according to stored running routines. Although in Figure 2 the first control unit200 is connected to the electrical machine 250, it is in practice connected to the rectifier 253. ln practice the first control unit 200 is adapted to controlling the electrical machine 250 14 by means of the rectifier 253. For example, the first control unit 200 is adapted to choosingthe running direction for the electrical machine 250 according to said stored routines. Thismeans that the first control unit 200 is adapted to causing the electrical machine 250 toserve as a motor to impart driving torque to the gearbox input shaft 245. lt also means thatwhere appropriate the first control unit 200 is adapted to causing the electrical machine 250 to serve as a generator to charge the battery 255.
The first control unit 210 is arranged for communication with the gearbox 260 via a linkL260. The first control unit 200 is adapted to controlling the operation of the gearbox 260according to stored running routines. lt is for example adapted to causing different gearsteps in the gearbox, including neutral position, according to said stored routines. Thegearbox 260 may be a so-called manual gearbox, e.g. a robotised/automated manual gearbox, or an automatic gearbox.
A second control unit 210 is arranged for communication with the first control unit 200 via alink L210. The second control unit 210 may be detachably connected to the first control unit200. The second control unit 210 may be a control unit external to the vehicle 100. Thesecond control unit 210 may be adapted to affecting the innovative method steps accordingto the invention. lt may be used to cross-load software to the first control unit, particularlysoftware for applying the innovative method. lt may alternatively be arranged forcommunication with the first control unit 200 via an internal network on board the vehicle100. The second control unit 210 may for example be adapted to performing substantiallysimilar functions to the first control unit 200, e.g. controlling the operation of the engine230, the clutch 240, the electrical machine configuration comprising the electrical machine250, the rectifier 253 and the battery 255, and the gearbox 260. The second control unit 210may be adapted to performing substantially similar functions to those of the first controlunit, e.g. reserving a predetermined amount of torque and power of said engine 230 for atleast a portion of an engine speed interval in addition to new maximum torque T2max andnew maximum power P2max, respectively, for operation of torque/power consuming units ofthe vehicle only. lt should be noted that certain of the above functions may be performed by the first control unit 200 and certain of them by the second control unit 210. ln one embodiment a speed sensor (not depicted) is provided to continuously detect aprevailing speed N of the electrical machine 250. This sensor is adapted to continuouslysending to the first control unit 200 via a link (not depicted) signals which containinformation about a prevailing speed N. Said detected speed N may be used as a parameterfor controlling the operation of the vehicle during operation according to one aspect of the invention.
A first torque/power consuming unit 291 is powered by said engine 230. Said firsttorque/power consuming unit 291 may be mechanically driven by said engine 230. Said firsttorque/power consuming unit 291 may comprise a number of torque/power consumingunits. Said first torque/power consuming unit 291 may comprise a number of different torque/power consuming units.
A second torque/power consuming unit 292 is powered by said energy store 255. Saidsecond torque/power consuming unit 292 may be electrically driven by said energy store255 and/or said the electrical machine 250. Said second torque/power consuming unit 292may comprise a number of torque/power consuming units. Said second torque/power consuming unit 292 may comprise a number of different torque/power consuming units.
A third torque/power consuming unit 293 is powered by said output shaft 265. Said thirdtorque/power consuming unit 293 may be mechanically/electrically driven by said outputshaft 265, or any other suitable part of the transmission of said vehicle 100. Said thirdtorque/power consuming unit 293 may comprise a number of torque/power consumingunits. Said third torque/power consuming unit 293 may comprise a number of different torque/power consuming units.
Said first torque/power consuming unit 291, second torque/power consuming unit 292 and third torque/power consuming unit 293 may be any unit chosen among the group AC (Air 16 Conditioner) arrangement, fan, motor fan, air Compressor, PTO unit (Power Take Off), Compressor arrangement (for e.g. a garbage truck), cement mixer, pump arrangement, etc.
According to an embodiment a torque/power consuming unit may comprise the energy store 255.
Figure 3a schematically i||ustrates a diagram according to an aspect ofthe invention.
Hereby is i||ustrated a maximum available torque Tlmax from said power source 230 as afunction of power source speed N. Said torque is given in the unit Nm and said power source speed N is given in revolutions per minute (RPM).
Said maximum provided torque Tlmax is a predetermined function which may be stored in amemory of the first control unit 200. This provides that for every given power source speed a maximum torque output is allowable.
According to an embodiment of the invention there is provided a new maximum availabletorque T2max, which differs from said provided torque Tlmax. Said maximum providedtorque T2max is a predetermined function which may be stored in a memory of the firstcontrol unit 200. By providing this new maximum available torque T2max, which is lowerthan said maximum torque Tlmax, a certain amount of available torque is advantageously reserved, according to an embodiment ofthe invention.
Thus, torque provided by said power source may, for any given power source speed N, beavailable for propelling said vehicle and also driving at least one of said torque/powerconsuming units 291, 292 and 293. However, if a total required torque of the vehicle isgreater than an available torque T2max, said reserved torque may be used for driving onlysaid at least one of said torque/power consuming units 291, 292 and 293. The amount oftorque, which is the difference between said torque Tlmax and said torque T2max is usedonly for driving said at least one torque/power consuming units 291, 292 and 293, not propulsion of the vehicle. This is controlled by said first control unit 200.
According to an embodiment it is reserved a predetermined amount of torque of said power source 230 for a power source speed interval N1-N2 running above a certain power source 17 speed value N1. Said certain power source speed value N1 may correspond to an idling speed of said power source 230, e.g. 500 or 800 RPM.
According to an embodiment said predetermined amount of torque of said power source230 is reserved so that said predetermined amount regarding torque is decreased with anincreased power source speed N. This means that a greater amount of reserved torque isavailable within a portion of said power source speed interval N1-N2 at a lower end of saidinterval (closer to Nl) and that a smaller amount of reserved torque is available within aportion of said power source speed interval N1-N2 at a higher end of said interval (closer to Nz).
According to an example said reserved amount of torque of said power source 230 may be about 10-20% of said maximum torque Tlmax.
Figure 3b schematically illustrates a diagram according to an aspect of the invention.
Hereby is illustrated a maximum available power Plmax from said power source 230 as afunction of power source speed N. Said power is given in the unit Watt (W) and said power source speed N is given in revolutions per minute (RPM).
Said maximum provided torque Plmax is a predetermined function which may be stored in amemory of the first control unit 200. This provides that for every given power source speed a maximum power output is allowable.
According to an embodiment of the invention there is provided a new maximum availablepower P2max, which differs from said provided power Plmax. Said maximum providedpower P2max is a predetermined function which may be stored in a memory of the firstcontrol unit 200. By providing this new maximum available power P2max, which is lowerthan said maximum power Plmax, a certain amount of available power is advantageously reserved, according to an embodiment ofthe invention.
Thus, power provided by said power source 230 may, for any given power source speed N,be available for propelling said vehicle 100 and also driving at least one of said torque/power consuming units 291, 292 and 293. However, if a total required power of the vehicle 100 is 18 greater than an available power P2max, said reserved power may be used for driving onlysaid at least one of said torque/power consuming units 291, 292 and 293. The amount ofpower, which is the difference between said power Plmax and said power P2max is usedonly for driving said at least one torque/power consuming units 291, 292 and 293, not propulsion of the vehicle 100. This is controlled by said first control unit 200.
According to an embodiment it is reserved a predetermined amount of power of said powersource 230 for a power source speed interval N3-N4 running above a certain power sourcespeed value N3. Said certain power source speed value N1 may correspond to an idling speed of said power source 230, e.g. 500 or 800 RPM.
According to an embodiment said predetermined amount of power of said power source isreserved so that said predetermined amount regarding power is substantially unchangedwith an increased power source speed. This means that if a certain amount of reservedtorque is available within a portion of said power source speed interval N3-N4 at a lower endof said interval (closer to N3) is substantially the same within a portion of said power source speed interval N3-N4 at a higher end of said interval (closer to N4).
According to an example said reserved amount of power of said power source 230 may be about 10-20% of said maximum power Plmax.
Figure 4a is a schematic flowchart of a method for controlling the operation of a powersource 230 of a vehicle 100 according to an embodiment of the invention. The methodcomprises a method step s401. The method step s401 comprises the steps of: - providing a maximum torque T1max and maximum power Plmax of said power source 230 for a certain power source speed interval N1-N2 and N3-N4, respectively; - providing a new maximum torque T2max and new maximum power P2max of said powersource 230 for a certain power source speed interval N1-N2 and N3-N4, respectively,available for propulsion of said vehicle 100 and operation of torque/power consuming units 291, 292, 293 of the vehicle 100; and 19 - reserving a predetermined amount of torque and power of said power source 230 for atleast a portion of said power source speed interval N1-N2 and N3-N4, respectively, inaddition to said new maximum torque T2 and new maximum power P2, respectively, for operation of torque/power consuming units 291, 292, 293 of the vehicle 100 only.
After the method step s401 the method ends.
Figure 4b is a schematic flowchart of a method for controlling the operation of an engine230 of a vehicle 100, according to an embodiment of the invention. The method comprises amethod step s402. The method step s402 comprises the steps of: - providing a maximum torque T1max and maximum power Pmax1 of said engine 230 for a certain engine speed interval N1-N2 and N3-N4, respectively; - providing a new maximum torque Tmax2 and new maximum power P2max of said engine230 for a certain engine speed interval N1-N2 and N3-N4, respectively, available forpropulsion of said vehicle 100 and operation of torque/power consuming units 291, 292, 293 ofthe vehicle 100; and - reserving a predetermined amount of torque and power of said engine 230 for at least aportion of said engine speed interval N1-N2 and N2-N4, respectively, in addition to said newmaximum torque T2max and new maximum power P2max, respectively, for operation oftorque/power consuming units 291, 292, 293 of the vehicle 100 only. The engine 230 may for example be a combustion engine. After the method step s402 the method ends.
Figure 4c is a more detailed schematic flowchart of a method for controlling the operation of a power source 230 of a vehicle 100, according to an embodiment of the invention.
The method comprises a method step s410. The method step s410 comprises the step ofproviding a maximum torque T1max and maximum power P1max of said power source 230for a certain power source speed interval N1-N2 and N3-N4 respectively. The power sourcespeed values N1 and N3 may be any suitable power source speed values, e.g. correspondingto an idle speed of said power source. Said power source speed values N1 and N3 may bemutually different or substantially identical. Said power source speed values N2 and N4 may be mutually different or substantially identical.
A function relating to said maximum torque Tlmax depending on a power source speed Nmay be stored in a memory of the first control unit 200. A function relating to said maximumpower Plmax depending on a power source speed N may be stored in a memory of the first control unit 200. Said functions are according to an example predetermined functions.
After the method step s410 a subsequent method step s420 is performed.
The method step s420 comprises the method step of providing a new maximum torqueT2max and new maximum power P2max of said power source 230 for a certain powersource speed interval N1-N2 and N3-N4, respectively, available for propulsion of said vehicle 100 and operation of torque/power consuming units 291, 292 and 293 of the vehicle 100.
These new maximum torque T2max and new maximum power P2max is predeterminedaccording to an embodiment. A function relating to said new maximum torque T2maxdepending on a power source speed N may be stored in a memory of the first control unit200. A function relating to said new maximum power P2max depending on a power source speed N may be stored in a memory of the first control unit 200.After the method step s420 a subsequent method step s430 is performed.
The method step s430 comprises the step of reserving a predetermined amount of torqueand power of said power source 230 for at least a portion of said power source speedinterval N1-N2 and N3-N4, respectively, in addition to said new maximum torque T2max andsaid new maximum power P2max, respectively, for operation of torque/power consuming units of the vehicle only.
Hereby said first control unit 200 is arranged to control said power source 230 such thattorque and power up to the limit T2max and P2max may be used for propelling the vehicleand if possible also drive said at least one torque/power consuming units 291, 292 and 293.Hereby said first control unit 200 is arranged to control said power source 230 such thattorque and power up to the limit T2max and P2max may be used for propelling the vehicle and if possible also drive said hybrid system configuration comprising said energy store 255. 21 lf a total demand ofthe torque/power consuming units and said hybrid system configurationtogether with required torque/power for propelling said vehicle 100 is greater than at leastone of said new maximum torque T2max and said new maximum power P2max saidreserved amount of torque and power are used for driving the torque/power consuming units 291, 292 and 293 and said hybrid system configuration only.
Said reserved amount of torque may be smaller or larger than a difference between saidnew maximum torque T2max and said maximum torque T1max for any given power sourcespeed. Said reserved amount of power may be smaller or larger than a difference betweensaid new maximum power P2max and said maximum power P1max for any given power source speed.
After the method step s430 the method ends.
Figure 5 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 controlling 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.
According to an aspect of the invention there is provided a computer program P comprising routines for controlling the operation of a power source 230 of a vehicle 100.
The computer program P comprises routines for providing a maximum torque T1max andmaximum power P1max of said power source for a certain power source speed interval N1- N2, N3-N4.
The computer program P comprises routines for providing a new maximum torque T2 and new maximum power P2 of said power source 230 for a certain power source speed interval 22 N1-N2, N3-N4 available for propulsion of said vehicle 100 and operation of torque/power consuming units 291, 292, 293 of the vehicle 100.
The computer program P comprises routines for reserving a predetermined amount oftorque and power of said power source for at least a portion of said power source speedinterval N1-N2, N3-N4 in addition to said new maximum torque T2 and new maximumpower P2, respectively, for operation of torque/power consuming units 291, 292, 293 of the vehicle 100 only.
The computer program P may comprise routines for reserving a predetermined amount oftorque of said power source 230 for a power source speed interval N1-N2 running above acertain power source speed value N1.
The computer program P may comprise routines for reserving a predetermined amount ofpower P of said power source 230 for a power source speed interval N3-N4 running above a certain power source speed value N3.
The computer program P may comprise routines for reserving said predetermined amountof torque of said power source so that said predetermined amount regarding torque is decreased with an increased power source speed N.
The computer program P may comprise routines for reserving said predetermined amountof power of said power source 230 so that said predetermined amount regarding power is substantially unchanged with an increased power source speed N.
The computer program P may comprise routines for adapting said reserved predeterminedamount of torque and power of said power source for at least a portion of said power sourcespeed interval to the overall configuration of said torque/power consuming units 291, 292, 293 of the vehicle.
The computer program P may comprise routines for providing reserved torque/power forcharging an energy storage means 255 associated with a hybrid operation configuration of said vehicle 100.
According to an aspect of the invention there is provided a computer program P for controlling the operation of an engine 230 of a vehicle 100 comprising routines for: 23 - providing a maximum torque T1max and power P1max of said engine 230 for a certain engine speed interval N1-N2, N3-N4; - providing a new maximum torque T2max and new maximum power P2max of said enginefor a certain engine speed interval N1-N2, N3-N4 available for propulsion of said vehicle 100 and operation of torque/power consuming units 291, 292, 293 of the vehicle 100; and - reserving a predetermined amount of torque and power of said engine 230 for at least aportion of said engine speed interval N1-N2, N3-N4 in addition to said new maximum torqueT2max and new maximum power P2max, respectively, for operation of torque/power consuming units of the vehicle only.
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.
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 of the 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, L230, L240, L250 and L260, 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 dataprocessing unit 510 will be prepared to conduct code execution as described above.According to one embodiment signals received on the data port 599 comprises informationabout prevailing engine speed N of the engine 230. The signals received on the data port 299 may be used by the device 500 for controlling the operation of said engine 230 so that, when 24 applicable, torque/power required for driving at least one torque/power consuming unit291, 292, 293 may be provided with reserved torque/power above said maximum torque/power T2max and P2max.
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 i||ustrative and descriptive purposes. lt is not intended to be exhaustive, nor tolimit the invention to the variants described. Many 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.

Claims (16)

Claims
1. A method for controlling the operation of a power source (230) of a vehicle (100), comprising the step of: - providing (s410) a maximum torque (T1max) and maximum power (P1max) of said power source (230) for a certain power source speed interval (N1-N2; N3-N4),characterized in the steps of: - providing (s420) a new maximum torque (T2max) and new maximum power (P2max) ofsaid power source (230) for a certain power source speed interval (N1-N2; N3-N4) availablefor propulsion of said vehicle (100) and operation of torque/power consuming units (291; 292; 293; 255) of the vehicle (100); and - reserving (s430) a predetermined amount of torque and power of said power source (230)for at least a portion of said power source speed interval (N1-N2; N3-N4) in addition to saidnew maximum torque (T2max) and new maximum power (P2max), respectively, for operation of torque/power consuming units (291; 292; 293) of the vehicle (100) only.
2. The method according to claim 1, comprising the step of: - reserving a predetermined amount of torque and power of said power source (230) for a power source speed interval running above a certain power source speed value (N1; N3).
3. The method according to claim 1 or 2, comprising the step of: - reserving said predetermined amount of torque of said power source (230) so that said predetermined amount regarding torque is decreased with an increased power source speed (N)- 26
4. The method according to any one of c|aims 1-3, comprising the step of: - reserving said predetermined amount of power of said power source (230) so that saidpredetermined amount regarding power is substantially unchanged with an increased power source speed (N).
5. The method according to any one of c|aims 1-4, comprising the step of: - adapting said reserved predetermined amount of torque and power of said power source(230) for at least a portion of said power source speed interval to the overall configuration of said torque/power consuming units (291; 292; 293) of the vehicle (100).
6. The method according to any one of c|aims 1-5, comprising the step of: - providing reserved torque/power for charging an energy storage means (255) associated with a hybrid operation configuration (299) of said vehicle (100).
7. A system for controlling the operation of a power source (230) of a vehicle (100), comprising: - means (200; 210; 500) for providing a maximum torque (T1max) and power (P1max) of said power source (230) for a certain power source speed interval (N1-N2; N3-N4),characterized in: - means (200; 210; 500) for providing a new maximum torque (T2max) and new maximumpower (P2max) of said power source (230) for a certain power source speed interval (N1-N2;N3-N4) available for propulsion of said vehicle (100) and operation of torque/power consuming units (291; 292; 293; 255) of the vehicle (100); and - means for reserving a predetermined amount of torque and power of said power source (230) for at least a portion of said power source speed interval (N1-N2; N3-N4) in addition to 27 said new maximum torque (T2max) and new maximum power (P2max), respectively, for operation of torque/power consuming units (291; 292; 293) of the vehicle (100) only.
8. The system according to c|aim 7, comprising: - means (200; 210; 500) for reserving a predetermined amount of torque and power of saidpower source (230) for a power source speed interval (N1-N2; N3-N4) running above a certain power source speed value (N1; N3).
9. The system according to c|aim 7 or 8, comprising: - means (200; 210; 500) for reserving said predetermined amount of torque of said powersource so that said predetermined amount regarding torque is decreased with an increased power source speed (N).
10. The system according to any one of c|aims 7-9, comprising: - means (200; 210; 500) for reserving said predetermined amount of power of said powersource so that said predetermined amount regarding power is substantially unchanged with an increased power source speed (N).
11. The system according to any one of c|aims 7-10, comprising: - means (200; 210; 500) for adapting said reserved predetermined amount of torque andpower of said power source for at least a portion of said power source speed interval (N1-N2; N3-N4) to the overall configuration of said torque/power consuming units (291; 292; 293) of the vehicle (100).
12. The system according to any one of c|aims 7-11, comprising: 28 - means (200; 210; 500) for providing reserved torque/power for charging an energy storage means (255) associated with a hybrid operation configuration (299) of said vehicle (100).
13. A motor vehicle (100; 110) comprising a system according to any of c|aims 7-12.
14. The motor vehicle (100; 110) according to claim 13, wherein said motor vehicle is any of a truck, bus or car.
15. A computer program (P) for controlling the operation of a power source (230) of avehicle (100), wherein said computer program (P) comprises a program code for causing anelectronic control unit (200; 500) or a computer (210; 500) connected to the electronic control unit (200; 500) to perform the steps according to any one of c|aims 1-6.
16. A computer program product comprising a program code stored on a computer readablemedium for performing method steps according to any one of c|aims 1-6, when saidprogram code is run on an electronic control unit (210; 500) or a computer (210; 500) connected to the electronic control unit (200; 500).
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