US20110301820A1 - Electrically actuatable module of a motor vehicle and method for identifying an electrically actuatable module of a motor vehicle - Google Patents

Electrically actuatable module of a motor vehicle and method for identifying an electrically actuatable module of a motor vehicle Download PDF

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Publication number
US20110301820A1
US20110301820A1 US12/999,780 US99978009A US2011301820A1 US 20110301820 A1 US20110301820 A1 US 20110301820A1 US 99978009 A US99978009 A US 99978009A US 2011301820 A1 US2011301820 A1 US 2011301820A1
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US
United States
Prior art keywords
module
identifier
control unit
accordance
component
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US12/999,780
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English (en)
Inventor
Gerhard Müllner
Karl Reisinger
Ralf Schwarz
Tim Christopher Meissner
Maik Hofmann
Thomas Ferstl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Magna Powertrain GmbH and Co KG
Audi AG
Original Assignee
Magna Powertrain GmbH and Co KG
Audi AG
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 Magna Powertrain GmbH and Co KG, Audi AG filed Critical Magna Powertrain GmbH and Co KG
Assigned to MAGNA POWERTRAIN AG & CO KG, AUDI AG reassignment MAGNA POWERTRAIN AG & CO KG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SCHWARZ, RALF, MEISSNER, TIM CHRISTOPHER, FERSTL, THOMAS, HOFMANN, MAIK, MULLNER, GERHARD, REISINGER, KARL
Publication of US20110301820A1 publication Critical patent/US20110301820A1/en
Abandoned legal-status Critical Current

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    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C5/00—Registering or indicating the working of vehicles
    • 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
    • B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
    • B60W50/0098—Details of control systems ensuring comfort, safety or stability not otherwise provided for

Definitions

  • the present invention relates to an electrically actuable module of a motor vehicle having at least one component including a non-volatile memory, wherein the component has a basic functionality characteristic for the component and required for the operation of the of the module.
  • the invention furthermore relates to a method for identifying such an electrically actuable module.
  • a module of this kind can, for example, be a differential unit having a torque transfer clutch by which a direct distribution of a drive torque between two wheels of an axle of a motor vehicle takes place.
  • the module can furthermore, for example, also be formed by a torque transfer clutch or by an actuator for a torque transfer clutch which serves for the direct distribution of the drive torque between a front axle and a rear axle in an all-wheel drive vehicle.
  • Such assemblies have to be able to be actuated with high precision.
  • the existing tolerances are therefore individually determined for each produced module in the manufacture for the purpose of a calibration, with the assemblies being divided into different variants or tolerance categories in accordance with a predetermined classification scheme.
  • the respective determined variant of a specific module can thus be taken into account by an associated control unit of the vehicle to actuate the module with the desired precision.
  • a problem in connection with such a calibration and classification of electrically actuable assemblies is that the assemblies and the associated control units are sometimes installed in the vehicle independently of one another at the vehicle manufacturer's.
  • a teach-in process therefore usually takes place after the installation of the module and of the control unit in which the respective current classification of the module used is communicated to the control unit and is stored therein so that it can actuate the module with the desired precision. If, for example, an exchange of the electrically actuable module or of the control unit takes place later in a service case, this teach-in process has to be carried out again so that the correct actuation of the module by the control unit is in turn ensured.
  • a method should furthermore be provided for the safe identification of such an electrically actuable module.
  • this object is satisfied starting from an electrically actuable module of the initially named kind in that the memory includes a memory region not used for the realization of the basic functionality of the component, in that an identifier identifying the module with a preset probability is stored in the memory region and in that the identifier can be read out of the memory region of the component.
  • a method in accordance with the invention is characterized in that an identifier identifying the module with a preset probability is read out of a memory region not used for the realization of the basic functionality of the component.
  • the component is thus a component which is also present in a module not configured in accordance with the invention and has a basic functionality which is necessary for the basic operation of the module.
  • it is thus not an additional component which is used for the storage, but rather a component is used in which the possibility of a storage of an identifier is already inherently present, with the corresponding memory which is required for the realization of the basic functionality of the component including a memory region which is not used for the realization of this basic function.
  • This memory region which is unused without a realization of the invention is used in accordance with the invention for the storage of the identifier of the module so that no additional module parts are required and thus no increase in the failure risk of the electrically actuable module is present.
  • a classification of the module is furthermore not stored in the memory region, but rather an identifier identifying the module with a preset probability.
  • the identifier is selected in this respect so that the module can be identified with sufficient probability on the basis of the identifier. If, for example, the module is replaced in a service case, the exchange can be recognized on the basis of the identifier which is thereby likewise changed. In this case, the required steps can be carried out, for example a service routine can be performed in which the current classification of the new module is taught to the control unit.
  • the classification which can be input manually to the control unit can, for example, be indicated at the housing of the electrically actuable module.
  • a control unit for actuating the module is provided and is connected to the module, with the module being configured for transferring the identifier stored in the memory region to the control unit.
  • the transfer can in this respect, for example, take place on the basis of a control signal output by the control unit.
  • the identifier is output by the module without application of an external control signal in that it is, for example, applied to a separate output line of the module.
  • the identifier stored in the module can thus be transferred to the control unit and stored, for example in a teach-in mode, in the control unit and can be used in an operating mode for identifying the electrically actuable module.
  • the control unit can for this purpose include a non-volatile memory for storing the identifier transferred by the module in the teach-in mode.
  • the identifier characterizing the module is thus transferred to the control unit and stored therein. It is generally also possible that the identifier is not transferred to the control unit by the module, but is rather, for example, input manually into the control unit and stored there in the teach-in mode.
  • the identifier stored in the control unit in the teach-in mode can then be compared in an operating mode with an identifier transferred to the control unit by the module during operation.
  • the control unit can include a comparison section for comparing the identifier stored in the teach-in mode with an identifier transferred to the control unit by the module in an operating mode. In the operating mode, no storage of the transmitted identifier in the memory of the control unit thus takes place, but rather only a comparison of the currently transferred identifier with the identifier already stored in the control unit.
  • the identifier is thus read out of the memory region in the operating mode, is transferred to the control unit connected to the module for the actuation thereof and is compared by the control unit with an identifier stored in the control unit in the teach-in mode.
  • control unit includes an evaluation section by which an error signal can be generated when a difference is found by the comparison section between the identifier stored in the memory and the currently transferred identifier.
  • the module can in particular be deactivated by the error signal.
  • the identifier stored in the control unit no longer coincides with the currently transferred identifier of the module so that the control unit generates the error signal and optionally deactivates the module.
  • a new teach-in process can be carried out in which the identifier of the currently used module is transferred to the control unit and is stored in its non-volatile memory.
  • a classification indicated at the housing of the current module can be manually stored in the control unit so that the module and the control unit are coordinated with one another again after the end of the teach-in process and the termination of the service mode.
  • the module used is again recognized by a comparison of the transferred identifier with the identifier stored in the control unit as the correctly associated module so that normal operation can be continued with a correct actuation of the module.
  • the identifier is read out of the memory region and transferred to the control unit repeatedly at preset points in time, in particular after switching the module on and/or after receipt of a preset request signal.
  • the identifier can be read out of the base unit and transferred to the control unit and compared with the identifier stored in the control unit. Since it can be assumed that the control unit or the module will only be replaced when the ignition is switched off, the check of the identifier transmitted by the currently used module with the identifier stored in the control unit is in each case suitable at the time of the switching on of the ignition of the motor vehicle to ensure a safe check that the module and control unit belong together.
  • the module is configured as a torque transfer clutch or as an actuator for a torque transfer clutch.
  • the module can in this respect in particular be configured as a differential unit or as a transfer case. It is generally possible that the module is any desired other electrically actuable module which can be actuated by a control unit and in which an identification with a preset probability is required.
  • the component is configured as a sensor, in particular as a measured value sensor.
  • the components can thus, for example, be configured as a pressure sensor such as is used in torque transfer clutches.
  • a non-volatile memory can be present in it which includes memory regions not used for the realization of the basic functionality of the component. They can then be used for realizing the invention.
  • the component can generally be configured as any desired component required for the basic functionality of the electrically actuable module as long as it includes a non-volatile memory having a memory region not used for the realization of the basic functionality of the component.
  • the identifier is stored distributed in different memory regions of different components of the module, with none of the memory regions being used for the realization of the basic functionality of the respective component.
  • the described distributed storage of the identifier in different memory regions of different components is possible.
  • the failure risk and the complexity of the electrically actuable module is also not increased since only components required for the realization of the basic functionality are used.
  • the identifier is transferred as a digital numerical value.
  • a very simple processing as well as a high process security is achievable by the use, in particular the storage and transfer as well as evaluation, as a digital numerical value.
  • the identifier is formed by a random number. It is generally also possible that the identifiers of different assemblies are formed by running numbers. What is important for the formation of the identifier is only that a sufficiently large disambiguity and thus a sufficiently large probability is ensured for an unambiguous identification of the module by the identifier.
  • FIG. 1 a schematic representation of a part of a motor vehicle having an electrically actuable module configured in accordance with the invention
  • FIG. 2 a schematic structure of an electrically actuable module configured in accordance with the invention having a control unit connected thereto.
  • a vehicle powertrain 1 is shown in FIG. 1 having a drive 2 which includes a power transmission path 3 , an engine 4 and a transmission 5 .
  • the power transmission path 3 includes a drive shaft 6 which is driven by the transmission 5 and two half shafts 7 of which each is connected to a driven wheel 8 .
  • a differential unit 9 is arranged between the half shafts 7 and the drive shaft 6 and the drive torque transferred by the engine 4 to the drive shaft 6 can be transferred to one or both half shafts 7 by it.
  • FIG. 1 the basic structure of a vehicle with rear-wheel drive is shown, the invention can naturally also be applied to a motor vehicle having front-wheel drive or all-wheel drive.
  • the differential unit 9 is connected to a control unit 10 which actuates the differential unit 9 in dependence on a plurality of vehicle parameters to realize a so-called torque-vectoring operation (TV operation) and to distribute the drive torque delivered by the engine 4 as required to the driven wheels 8 .
  • TV operation torque-vectoring operation
  • the control unit 10 is connected to a plurality of sensors 23 , 24 which can include, for example, a yaw rate sensor 23 , wheel speed sensors 24 , a steering wheel angle sensor, not shown, and/or a steering angle sensor, not shown, as well as other suitable sensors such as lateral and longitudinal acceleration sensors.
  • the driving parameters detected by the sensors are characteristic for a plurality of operating states, e.g. the yaw rate of the vehicle or the speed of the driven wheels 8 .
  • a differential control signal is generated by the control unit 10 which serves for the control of the differential unit 9 and in particular of an actuator arranged within the differential unit 9 .
  • FIG. 2 A very simplified schematic representation of the structure of the differential unit 9 is shown in FIG. 2 which forms an electrically actuable module 11 in accordance with the present invention as well as a representation of the control unit 10 connected thereto.
  • the module 11 includes two hydraulically actuable multidisk clutches 12 which are coupled to the half shafts 7 and which can be situated via a fluid pump 22 driven by an electric motor 13 for the direct transfer of a torque.
  • a pressure sensor 14 is furthermore provided by which the respective set hydraulic pressure can be measured, wherein, for example, the pressure is measured selectively in the left or right multidisk clutch 12 via shuttle valves, not shown. It is generally also possible to provide a plurality of corresponding pressure sensors 14 .
  • the pressure sensor 14 in this respect forms a component 15 of the electrically actuable module 11 which is required for the basic functionality of the module 11 , namely the direct distribution of the torque to the multidisk clutches 12 .
  • the pressure sensor 14 further includes a memory 16 in which values required for the tasks defined for its realization as a pressure sensor are stored.
  • the memory 16 also includes a memory region 17 which is not required for the realization of the basic function of the pressure sensor and thus for the realization of the basic functionality of the component 11 and thus forms a region of the memory 16 not used for the basic function.
  • an identifier is stored in an in particular digital form in the memory region 17 and can, for example, represent a random number or a running number and has a length to ensure an identification of the module 11 with a sufficient preset probability.
  • This identification is, for example, already written to the memory region 17 in the production of the module 11 and is advantageously unchangeable thereafter.
  • the identifier can, for example, be a digital number having a length of 16 bits so that the number of possible different identifiers amounts to 65,536.
  • An identifier defined with a preset probability and identifying the module 11 can thus be generated by a corresponding large length of the identifier. If required, a larger or optionally also a smaller length can be used.
  • a plurality of characteristics 18 is stored in the control unit 10 (for example pressure/torque dependencies) which each correspond to different variants or classifications of assemblies 11 .
  • Each manufactured module 11 is assigned to one of the predefined classifications which is in each case represented by one of the characteristics 18 .
  • the respective characteristic 18 is used which corresponds to the current classification of the module 11 used.
  • the classification of the currently used module 11 is thus taught into the control unit 10 so that the correct characteristic 18 corresponding to the current module 11 is used by the control unit 10 .
  • the identifier stored in the memory region 17 is read out of the module 11 and is stored in a non-volatile digital memory 19 of the control unit 10 after the installation of the module 11 and of the control unit 10 and the corresponding setting of the control unit 10 to the correct classification.
  • This first-time storage of the current identifier in the memory 19 takes place in a so-called teach-in mode and can take place via the control line of the module 11 or, for example, via a separate line.
  • the identifier identifying the used module 11 substantially without ambiguity is thus stored both in the memory region 17 of the module 11 and in the memory 19 of the control unit 10 .
  • the control unit 10 includes a comparison section 20 by which the identifier stored in the memory 19 is compared for coincidence with the identifier read out from the memory region 17 of the module 11 after the switching on of the ignition.
  • the identification can in this respect again take place via the control line of the module 11 or via a separate line.
  • An evaluation section 21 is furthermore provided by which an error signal can be generated in the event of a difference between the two identifiers. This error signal can, for example, result in the switching off of the electrical module 11 as well as in the generation of a corresponding optical or acoustic error signal.
  • the classification of the currently used module 11 must first again be input into the control unit 10 .
  • This can, for example, take place in that the classification of the current module 11 is visibly applied to the housing outer side and can be manually input into the control unit 10 so that the control unit 10 selects the correct characteristic 18 for the further actuation of the module 11 on the basis of the input classification.
  • the identifier stored in the memory region 17 of the module 11 has to be transferred to the control unit 10 and has to be stored in the memory 19 there. From this time onward, the module 11 and the control unit 10 are again coordinated with one another.
  • a check can be made regularly and it can be ensured that neither the module 11 nor the control unit 10 were replaced via the repeating comparison of the identifier stored in the memory 19 of the control unit 10 with the identifier read out of the memory region 17 of the module 11 .
  • the memory 16 and thus also the memory region 17 , represents a part of the component 15 and since the component 15 is required for the basic functionality of the module 11 , no additional component is required for identifying the module 11 and for checking in accordance with the invention the mutually coordinated elements (module 11 and control unit 10 ) so that the failure risk of the module 11 is not increased by the invention.
  • the invention can generally be applied to any desired electrically actuable assemblies which can be actuated via a control unit and in which a fixed association between the module and the control unit is important.
  • This is, for example, also the case with transfer cases with which a corresponding torque can be distributed between a front axle and a rear axle of a motor vehicle, with here the actuation being able to take place, for example, via an electrically activatable actuator, for example an electric motor having a downstream step-down gear.

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  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Human Computer Interaction (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Arrangement And Mounting Of Devices That Control Transmission Of Motive Force (AREA)
  • Control Of Electric Motors In General (AREA)
US12/999,780 2008-06-25 2009-06-22 Electrically actuatable module of a motor vehicle and method for identifying an electrically actuatable module of a motor vehicle Abandoned US20110301820A1 (en)

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DE102008030092.6 2008-06-25
DE102008030092A DE102008030092A1 (de) 2008-06-25 2008-06-25 Elektrisch ansteuerbare Baueinheit eines Kraftfahrzeugs und Verfahren zum Identifizieren einer elektrisch ansteuerbaren Baueinheit eines Kraftfahrzeugs
PCT/EP2009/004492 WO2009156110A1 (fr) 2008-06-25 2009-06-22 Module excitable électriquement d'un véhicule automobile et procédé d'identification d'un module excitable électriquement d'un véhicule automobile

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DE102008030092A1 (de) 2009-12-31
US9449434B2 (en) 2016-09-20
US20140114543A1 (en) 2014-04-24

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