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 PDFInfo
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- 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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- module
- identifier
- control unit
- accordance
- component
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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
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- 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.
Abstract
The invention relates to an electrically actuatable assembly of a motor vehicle having at least one component comprising a non-volatile memory. The component has base functionality characteristic for the component and required for the operation of the assembly. The memory comprises a memory region not utilized for realizing the base functionality of the component, in said memory region is stored a characteristic value that identifies the assembly with a predetermined probability. Furthermore, the characteristic value can be read out from the memory region of the component. Finally, the invention describes a method for identifying such an electrically actuatable assembly.
Description
- 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.
- It has already been proposed to encode the respective classification of a module in an additional coded plug and to fasten it to the module. The coded plug is connected to the control unit by which the current classification is read out of the coded plug and decoded. A correct actuation of the module is then possible on the basis of the read out classification.
- It is disadvantageous in this solution that an additional failure risk of the electrically actuable module arises on the basis of the coded plug formed as an additional component. The reading out, decoding and comparing of the classification stored in the coded plug with the classifications stored in the control unit is furthermore relatively complex to realize. It ultimately can also not be precluded that a coded plug is connected to the electrically actuable module and contains an incorrect classification so that the classification read out from the coded plug by the control unit is not correct.
- It is an object of the present invention to configure an electrically actuable module of the initially named kind so that it can be ensured in a simple and reliable manner that the electrically actuable module is in each case correctly actuated by the control unit. A method should furthermore be provided for the safe identification of such an electrically actuable module.
- In accordance with the invention, 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.
- In accordance with the invention, it is thus not the respective classification of the electrically actuable module which is stored in a separate component, but rather an identifier identifying the module with a preset, sufficient probability is stored in a component of the module, with this component already being a component required for the basic function of the electrically actuable module.
- 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. In accordance with the invention, 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.
- In accordance with an advantageous embodiment of the invention, 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. It is, however, also possible that 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. In this 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. For this purpose, 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. In accordance with the invention, 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.
- In accordance with an advantageous embodiment of the invention, the 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.
- In accordance with the invention, it is thus detected in the operating mode if the pairing of the module and of the control unit originally installed in the motor vehicle and coordinated with one another was changed in that either the module or the control unit or both elements were replaced. In each of these cases, 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.
- Subsequently, in a service mode, 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. At the same time, for example, 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. In the further operation, 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.
- Only on a renewed replacement of one of the two elements (module or control unit) does a difference again arise between the identifier stored in the control unit and the identifier transmitted by the module so that an error signal is in turn generated by the control unit and a new service mode is necessary.
- In accordance with an advantageous embodiment of the invention, 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. For example, in each case when the ignition of the motor vehicle is switched on, 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.
- In accordance with a further advantageous embodiment of the invention, 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.
- In accordance with a further advantageous embodiment of the invention, 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. In particular when the component includes a so-called ASIC (application specific integrated circuit), 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.
- In accordance with a further advantageous embodiment of the invention, 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.
- If, for example, the memory region of the memory of an individual component is not large enough to store a sufficiently unambiguous identifier, the described distributed storage of the identifier in different memory regions of different components is possible. In this case, 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.
- In accordance with a further advantageous embodiment of the invention, 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.
- In accordance with a further preferred embodiment of the invention, 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.
- Further advantageous embodiments are set forth in the dependent claims.
- The invention will be described in more detail in the following with reference to embodiments and to the drawings; there are shown in these:
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FIG. 1 a schematic representation of a part of a motor vehicle having an electrically actuable module configured in accordance with the invention; and -
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 inFIG. 1 having adrive 2 which includes apower transmission path 3, an engine 4 and atransmission 5. Thepower transmission path 3 includes adrive shaft 6 which is driven by thetransmission 5 and twohalf shafts 7 of which each is connected to a drivenwheel 8. Adifferential unit 9 is arranged between thehalf shafts 7 and thedrive shaft 6 and the drive torque transferred by the engine 4 to thedrive shaft 6 can be transferred to one or bothhalf shafts 7 by it. Whereas inFIG. 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 acontrol unit 10 which actuates thedifferential 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 drivenwheels 8. - To determine the corresponding vehicle parameters, the
control unit 10 is connected to a plurality ofsensors 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 drivenwheels 8. Based on the vehicle parameters determined by thesensors control unit 10 which serves for the control of thedifferential unit 9 and in particular of an actuator arranged within thedifferential unit 9. - A very simplified schematic representation of the structure of the
differential unit 9 is shown inFIG. 2 which forms anelectrically actuable module 11 in accordance with the present invention as well as a representation of thecontrol unit 10 connected thereto. - The
module 11 includes two hydraulically actuablemultidisk clutches 12 which are coupled to thehalf shafts 7 and which can be situated via afluid pump 22 driven by anelectric motor 13 for the direct transfer of a torque. Apressure 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 ofcorresponding pressure sensors 14. Thepressure sensor 14 in this respect forms acomponent 15 of the electrically actuablemodule 11 which is required for the basic functionality of themodule 11, namely the direct distribution of the torque to themultidisk clutches 12. - The
pressure sensor 14 further includes amemory 16 in which values required for the tasks defined for its realization as a pressure sensor are stored. Thememory 16, however, also includes amemory 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 thecomponent 11 and thus forms a region of thememory 16 not used for the basic function. - In accordance with the invention, 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 themodule 11 with a sufficient preset probability. This identification is, for example, already written to thememory region 17 in the production of themodule 11 and is advantageously unchangeable thereafter. - To achieve a sufficient disambiguity, 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. - As can furthermore be recognized from
FIG. 2 , a plurality ofcharacteristics 18 is stored in the control unit 10 (for example pressure/torque dependencies) which each correspond to different variants or classifications ofassemblies 11. Each manufacturedmodule 11 is assigned to one of the predefined classifications which is in each case represented by one of thecharacteristics 18. To ensure a correct actuation of themodule 11 by thecontrol unit 10, it is necessary that the respective characteristic 18 is used which corresponds to the current classification of themodule 11 used. - On the installation of the
module 11 as well as of thecontrol unit 10 into a motor vehicle, the classification of the currently usedmodule 11 is thus taught into thecontrol unit 10 so that the correct characteristic 18 corresponding to thecurrent module 11 is used by thecontrol unit 10. - At the same time, the identifier stored in the
memory region 17 is read out of themodule 11 and is stored in a non-volatiledigital memory 19 of thecontrol unit 10 after the installation of themodule 11 and of thecontrol unit 10 and the corresponding setting of thecontrol unit 10 to the correct classification. This first-time storage of the current identifier in thememory 19 takes place in a so-called teach-in mode and can take place via the control line of themodule 11 or, for example, via a separate line. - After the first-time installation of the
control unit 10 and of themodule 11 and the concluded teach-in mode, the identifier identifying the usedmodule 11 substantially without ambiguity is thus stored both in thememory region 17 of themodule 11 and in thememory 19 of thecontrol unit 10. - On every switching on of the ignition of the motor vehicle, a check is made whether the identifier stored in the
memory region 17 of themodule 11 coincides with the identifier stored in thememory 19 of thecontrol unit 10. For this purpose, thecontrol unit 10 includes acomparison section 20 by which the identifier stored in thememory 19 is compared for coincidence with the identifier read out from thememory region 17 of themodule 11 after the switching on of the ignition. The identification can in this respect again take place via the control line of themodule 11 or via a separate line. Anevaluation 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 theelectrical module 11 as well as in the generation of a corresponding optical or acoustic error signal. - It is ensured in this manner that the
module 11 is only put into operation with an unchanged association of themodule 11 andcontrol unit 10 originally coordinated with one another by which the correct use of the correct characteristic 18 is ensured. - If, in contrast, the
module 11 or thecontrol unit 10 has been replaced without a new coordination between these elements having taken place, on the next switching on of the ignition of the motor vehicle, a difference is found by thecomparison section 20 between the identifier stored in thememory 19 of thecontrol unit 10 and the identifier read out of thememory region 17 of themodule 11 after the switching on of the ignition so that themodule 11 is deactivated by theevaluation unit 21. - In order again to coordinate the module and the
control unit 10 with one another, the classification of the currently usedmodule 11 must first again be input into thecontrol unit 10. This can, for example, take place in that the classification of thecurrent module 11 is visibly applied to the housing outer side and can be manually input into thecontrol unit 10 so that thecontrol unit 10 selects the correct characteristic 18 for the further actuation of themodule 11 on the basis of the input classification. - Subsequently, in a new teach-in mode, the identifier stored in the
memory region 17 of themodule 11 has to be transferred to thecontrol unit 10 and has to be stored in thememory 19 there. From this time onward, themodule 11 and thecontrol 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 thecontrol unit 10 were replaced via the repeating comparison of the identifier stored in thememory 19 of thecontrol unit 10 with the identifier read out of thememory region 17 of themodule 11. - Since the
memory 16, and thus also thememory region 17, represents a part of thecomponent 15 and since thecomponent 15 is required for the basic functionality of themodule 11, no additional component is required for identifying themodule 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 themodule 11 is not increased by the invention. - Whereas the invention has been described by way of example for a differential unit with which a torque can be distributed directly between two wheels of an axle, 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.
-
- 1 vehicle powertrain
- 2 drive
- 3 power transmission path
- 4 engine
- 5 transmission
- 6 drive shaft
- 7 half-shafts
- 8 wheels
- 9 differential unit
- 10 control unit
- 11 module
- 12 multidisk clutches
- 13 electric motor
- 14 pressure sensor
- 15 component
- 16 non-volatile memory
- 17 memory region
- 18 characteristics
- 19 non-volatile memory
- 20 comparison section
- 21 evaluation section
- 22 fluid pump
- 23 yaw rate sensor
- 24 wheel speed sensors
Claims (24)
1-23. (canceled)
24. 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 module,
wherein
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.
25. The module in accordance with claim 24 ,
wherein
a control unit for actuating the module is provided and is connected to the module; and in that the module is configured for transferring the identifier stored in the memory region to the control unit.
26. The module in accordance with claim 25 ,
wherein
the control unit includes a non-volatile memory for storing the identifier transferred by the module in a teach-in mode.
27. The module in accordance with claim 26 ,
wherein
the control unit includes 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.
28. The module in accordance with claim 26 ,
wherein
the control unit includes an evaluation unit 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.
29. The module in accordance with claim 28 ,
wherein
the module can be deactivated by the error signal.
30. The module in accordance with claim 24 ,
wherein
the module is made as a torque transfer clutch or as an actuator for a torque transfer clutch.
31. The module in accordance with claim 24 ,
wherein
the module is configured as a transfer case.
32. The module in accordance with claim 24 ,
wherein
the component is configured as a sensor, in particular as a measured value sensor.
33. The module in accordance with claim 32 ,
wherein
the component is configured as a pressure sensor.
34. The module in accordance with claim 24 ,
wherein
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.
35. The module in accordance with claim 24 ,
wherein
the module is configured for automatically transferring the identifier at a preset time, in particular after at least one of switching on the module and receiving a preset request signal.
36. The module in accordance with claim 24 ,
wherein
the identifier is transferred as a digital number.
37. The module in accordance with claim 24 ,
wherein
the identifier is formed by a random number.
38. The module in accordance with claim 24 ,
wherein
the identifiers of different assemblies are formed by running numbers.
39. A method for identifying an electrically actuable module of a motor vehicle, wherein the module includes at least one component including a non-volatile memory and having a basic functionality characteristic for the component and required for the operation of the module,
wherein
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.
40. The method in accordance with claim 39 ,
wherein,
in an operating mode, the identifier is read out of the memory region, is transferred to a control unit connected to the module for actuating it and is compared by the control unit with an identifier stored in the control unit in a teach-in mode.
41. The method in accordance with claim 40 ,
wherein,
in the teach-in mode, the identifier is read out of the memory region, is transferred from the module to the control unit and is stored by the control unit.
42. The method in accordance with claim 40 ,
wherein
an error signal is generated by the control unit when a difference is found between the identifier transferred in the operating mode and the identifier stored in the teach-in mode.
43. The method in accordance with claim 42 ,
wherein
the module is deactivated when the error signal is generated.
44. The method in accordance with claim 39 ,
wherein
the identifier is repeatedly read out of the memory region and transferred to the control unit at preset points in time, in particular after at least one of switching on the module and receipt of a preset request signal.
45. The method in accordance with claim 39 ,
wherein
respective stored part identifiers are read out of memory regions of different components of the module and the identifier is generated from the part identifiers, with none of the memory ranges being used for the realization of the basic functionality of the respective component.
46. The method in accordance with claim 39 ,
wherein
the identifier is transferred to the control unit as a digital number.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008030092A DE102008030092A1 (en) | 2008-06-25 | 2008-06-25 | Electrically controllable assembly of a motor vehicle and method for identifying an electrically controllable assembly of a motor vehicle |
DE102008030092.6 | 2008-06-25 | ||
PCT/EP2009/004492 WO2009156110A1 (en) | 2008-06-25 | 2009-06-22 | Electrically actuatable assembly of a motor vehicle and method for identifying an electrically actuatable assembly of a motor vehicle |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2009/004492 A-371-Of-International WO2009156110A1 (en) | 2008-06-25 | 2009-06-22 | Electrically actuatable assembly of a motor vehicle and method for identifying an electrically actuatable assembly of a motor vehicle |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/144,141 Continuation US9449434B2 (en) | 2008-06-25 | 2013-12-30 | Electrically actuatable module of a motor vehicle and method for identifying an electrically actuatable module of a motor vehicle |
Publications (1)
Publication Number | Publication Date |
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US20110301820A1 true US20110301820A1 (en) | 2011-12-08 |
Family
ID=41130351
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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US12/999,780 Abandoned US20110301820A1 (en) | 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 |
US14/144,141 Active US9449434B2 (en) | 2008-06-25 | 2013-12-30 | Electrically actuatable module of a motor vehicle and method for identifying an electrically actuatable module of a motor vehicle |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
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US14/144,141 Active US9449434B2 (en) | 2008-06-25 | 2013-12-30 | Electrically actuatable module of a motor vehicle and method for identifying an electrically actuatable module of a motor vehicle |
Country Status (3)
Country | Link |
---|---|
US (2) | US20110301820A1 (en) |
DE (1) | DE102008030092A1 (en) |
WO (1) | WO2009156110A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015058748A1 (en) * | 2013-10-21 | 2015-04-30 | Schaeffler Technologies AG & Co. KG | Electronic control system for a motor vehicle |
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DE102010038064B4 (en) * | 2010-10-08 | 2013-02-21 | Haldex Brake Products Gmbh | Air drying cartridge |
US10137908B2 (en) * | 2011-06-13 | 2018-11-27 | General Electric Company | Vehicle traction control system and method |
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WO2015058748A1 (en) * | 2013-10-21 | 2015-04-30 | Schaeffler Technologies AG & Co. KG | Electronic control system for a motor vehicle |
CN105658452A (en) * | 2013-10-21 | 2016-06-08 | 舍弗勒技术股份两合公司 | Electronic control system for a motor vehicle |
US20160311285A1 (en) * | 2013-10-21 | 2016-10-27 | Schaeffler Technologies AG & Co. KG | Electronic control system for a motor vehicle |
US9840124B2 (en) * | 2013-10-21 | 2017-12-12 | Schaeffler Technologies AG & Co. KG | Electronic control system for a motor vehicle |
Also Published As
Publication number | Publication date |
---|---|
US9449434B2 (en) | 2016-09-20 |
US20140114543A1 (en) | 2014-04-24 |
WO2009156110A1 (en) | 2009-12-30 |
DE102008030092A1 (en) | 2009-12-31 |
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