WO2011128567A1 - Method for the diagnosis of a means for the mechanical coupling of first and second axles of a motor vehicle - Google Patents
Method for the diagnosis of a means for the mechanical coupling of first and second axles of a motor vehicle Download PDFInfo
- Publication number
- WO2011128567A1 WO2011128567A1 PCT/FR2011/050824 FR2011050824W WO2011128567A1 WO 2011128567 A1 WO2011128567 A1 WO 2011128567A1 FR 2011050824 W FR2011050824 W FR 2011050824W WO 2011128567 A1 WO2011128567 A1 WO 2011128567A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- coupler
- motor vehicle
- transmission system
- temperature
- mode
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K17/00—Arrangement or mounting of transmissions in vehicles
- B60K17/34—Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles
- B60K17/348—Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles having differential means for driving one set of wheels, e.g. the front, at one speed and the other set, e.g. the rear, at a different speed
- B60K17/35—Arrangement or mounting of transmissions in vehicles for driving both front and rear wheels, e.g. four wheel drive vehicles having differential means for driving one set of wheels, e.g. the front, at one speed and the other set, e.g. the rear, at a different speed including arrangements for suppressing or influencing the power transfer, e.g. viscous clutches
-
- 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
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/02—Clutches
- B60W2510/0291—Clutch temperature
-
- 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
- B60W2556/00—Input parameters relating to data
- B60W2556/10—Historical data
Definitions
- the present invention relates to a method for diagnosing and controlling a transmission system of the four-wheel-drive type of a motor vehicle, including the control of a means for mechanically coupling a first axle to a second axle a transmission system of the four-wheel drive type of a motor vehicle.
- the invention also relates to a control system of the mechanical coupling means. It also relates to a transmission system comprising such a control system. It still relates to a vehicle comprising such a control system.
- the invention applies to a vehicle equipped with a piloted four-wheel drive system.
- the objective of this type of vehicle is to improve performance such as performance and safety.
- the invention aims to make the operation of a mechanical coupling device reliable by preventing its deterioration under extreme conditions of use.
- Document US 2003/098193 describes a method of distributing torque between the front and rear axles of a vehicle as a function of the difference between the speeds of rotation of the front and rear trains. This method improves the performance of the vehicle by optimizing the slip without defining a compromise between reliability and performance.
- Patent US5247443 describes a method of distributing torque between the front and rear trains of a vehicle as a function of the difference between the speeds of rotation of the front and rear trains, and which modifies the detection threshold on the sliding if the brake of parking is activated. This method improves the performance of the vehicle by optimizing the slip without defining a compromise between reliability and performance.
- the object of the invention is to provide a control solution of a mechanical coupling means of axles to overcome the problems mentioned above and to improve the control methods known from the prior art.
- the method makes it possible to establish a diagnosis of a transmission system of a four-wheel drive motor vehicle.
- the method comprises a step of estimating the state of wear of the transmission system from extreme events that it has undergone during its operation.
- the method may comprise a step of measuring or estimating the temperature of the coupler of its transmission system and may consider the extreme events undergone during its operation overheating, that is to say beyond a temperature predefined threshold.
- the step of estimating the state of wear of the transmission system whose coupler is an electromechanical clutch may comprise the following two substeps:
- the method may comprise a step of displaying the result of the diagnostic process by a human-machine interface of the motor vehicle.
- the method of controlling the coupler of the first and second axles of a transmission system of a motor vehicle comprises the implementation of a diagnostic method defined above and the definition of a control of the coupler function of this diagnostic method.
- the definition of a command of the coupler according to the diagnostic method can comprise the definition of the mode of operation of the coupler among the three following states:
- a third mode of transmission where no torque (or a negligible torque) from the torque source is transmitted to the rear axle.
- the control method may comprise the definition of three different states of the coupler according to three temperature thresholds.
- the control method may comprise a step of defining the mode of operation of the coupler according to its state.
- the invention also relates to a data storage medium readable by a computer on which is recorded a computer program comprising computer program code means for implementing the steps of the method defined above.
- a system controls a coupler of the first and second axles of a transmission system of a motor vehicle.
- the first axle is driven by default and the second axle is driven optionally according to the state of the coupling means.
- the system of control comprises hardware and / or software means for implementing a previously defined method.
- the control system may comprise a computer, one or more memories of the eeprom type, a means for estimating the temperature of the coupler or a communication means for receiving the measurement of the temperature of the coupler from a measurement sensor.
- the crying neck may be of friction type as an electromechanical clutch.
- the motor vehicle comprises a control system defined above.
- the invention also relates to a computer program comprising computer program code means adapted to carry out the steps of the method defined above.
- Fig ure 1 schematically shows a motor vehicle comprising a four-wheel drive system according to one embodiment of the invention.
- FIG. 2 represents the coupler temperature variation of the motor vehicle transmission system according to the execution mode as a function of time according to a predefined scenario.
- FIG. 3 represents the variation of the state of the temperature thresholds of the coupler as a function of time according to the preceding scenario.
- FIG. 4 represents a first variation of the mode of operation of the coupler as a function of time according to the preceding scenario.
- FIG. 5 represents a second variation of the mode of operation of the coupler as a function of time according to the preceding scenario.
- Figures 6 to 8 show a block diagram of the transmission system of the motor vehicle according to the embodiment of the invention.
- the motor vehicle 10 shown in Figure 1 comprises a transmission system 18 of the four-wheel drive type, and in particular of the driven four-wheel drive type.
- the transmission system 18 is in mechanical connection with a motor 13 (or stroke) for driving the vehicle.
- the transmission system 18 mainly comprises a first axle 17 of wheels 21, 22 connected by a differential 15 itself connected to the engine 13 via a gearbox 14 and a second axle 19 of wheels 23, 24 connected by a rear differential 16 , the rear differential 16 being connected to the differential 15 via a transfer box 25 and a mechanical coupling means (coupler) 1 1.
- the transmission system also comprises a control system 1 2 of the state of the mechanical coupling means.
- the control system comprises a means for selecting the operating mode of the transmission system and a computer.
- the transmission system comprises means for determining vehicle state variables, such as by example means for obtaining the rotational speed of each wheel, means for obtaining the information relating to braking (action detector on a brake pedal, action detector on a parking brake control member, detectors activation of a stability control system and / or motor and / or adhesion of the vehicle), and electronic means or automatic cal cal l.
- the transmission system comprises means for selection by the user (for example on the dashboard) of an operating mode of the system, in particular a first "AWD Auto" mode, a second "4WD Lock” mode or a third mode.
- the transmission system in particular the control system of the coupling means, also comprises all the hardware and / or software means making it possible to implement the methods that are the subject of the invention.
- the systems, in particular the computer may comprise a computer program comprising computer program code means adapted to performing the steps of the methods that are the subject of the invention.
- the first axle for example the front axle or the rear axle
- the second axle for example the rear axle or the front axle
- the mechanical coupling means of the front axle to the rear axle (coupler) according to the embodiment of the invention can operate in three modes of operation of the transmission system.
- ATD Auto a first mode of transmission where only a portion (variable) of the maximum torque capacity from a torque source (the engine of the motor vehicle) and intended for the rear axle is effectively transmitted to the rear axle;
- ATD Auto a first mode of transmission where only a portion (variable) of the maximum torque capacity from a torque source (the engine of the motor vehicle) and intended for the rear axle is effectively transmitted to the rear axle;
- ATD Auto a first mode of transmission where only a portion (variable) of the maximum torque capacity from a torque source (the engine of the motor vehicle) and intended for the rear axle is effectively transmitted to the rear axle;
- mode "2WD” a third mode of transmission where no torque (or negligible torque) from the torque source is transmitted to the rear axle; this third mode called mode "2WD” corresponding to a so-called coupler "open", that is to say that the coupler is disabled or transmits only a negligible amount of torque.
- the coupler may be of the friction type, that is to say it has friction discs intended to come into contact with each other to transmit the torque and an actuator means to discard or bring his records into contact with each other.
- the actuator means is controlled by the control system 12.
- the coupler is for example of electromagnetic clutch type driven by current.
- Friction is created by the difference in speed between the input and the output of the coupler, corresponding to the transmissions going to the front and rear trains.
- the transmission system implements a method of diagnosis of the mechanical coupling or coupling means which is based on its temperature, and more precisely the operating temperature of its actuator.
- This temperature can be estimated from the torque information (ETC) (measured or estimated) and wheel speed information.
- ETC torque information
- wheel speed information wheel speed information
- the temperature of the coupler could also be measured using a temperature sensor.
- the method of controlling the coupler is based on the definition of three temperature thresholds T0, T1 and T2. From the values of these three temperature thresholds, the coupler management method defines three different states. The first state, called “NormalTemperature”, corresponds to a normal operating temperature. The second state, called “WarningLeveM”, corresponds to a first alert level in which the temperature of the coupler is high but still allows its operation. Finally, the third state, called “WarningLevel2”, corresponds to a second level of alert for which the coupler is overheating.
- the management of the three different states of the coupler mentioned above, illustrated in FIGS. 2 and 3, is based on the three temperature thresholds T0, T1 and T2.
- the temperature T0 represents a first threshold below which the coupler operates normally and is located in the "NormalTemperature” state.
- T1 T1> TO
- T2 T1> T1
- T2 T2> T1
- T2 T2> T1
- T2 T2
- the coupler is in the state "WarningLevel2”.
- the temperature of the coupler increases, it goes into the "WarningLeveM” state between the temperatures T1 and T2, then in the "WarningLevel2" state beyond the temperature T2. Then, when its temperature decreases, it returns from the "WarningLevel2" state to the "NormalTemperature” state when the temperature falls below the threshold TO, at time t3.
- the method of controlling the motor vehicle coupler uses the states defined above to define the operating mode among the three modes explained above. This management of the mode of operation of the coupler is shown in FIGS. 4 and 5.
- the control means modifies its mode of operation in "4WD Lock” mode, then when it enters the "WarningLevel2” state, the control means modifies its mode of operation in "2WD” mode, in which no torque is no longer transmitted to the rear axle to allow the cooling of its actuator.
- the control means restores it to its original "AWD Auto" operating mode.
- a diagnostic method that takes into account these particular events of overheating of the transmission system of the motor vehicle is implemented.
- the diagnostic method uses a first counter for storing occurrences of overheating of the coupler actuator.
- This counter called “OverHeatFrequencyCounter”
- T2 threshold temperature
- ThermalStressMaxTemp a predefined value, for example 10 ° C (reached T2 + 10 ° C).
- T2 here represented by the variable ThermalStressMaxTemp.
- the value of the counter can range, for example, over a range from 0 to 255. Finally, when the counter reaches its maximum value, the latter is saturated at the latter. value.
- Block 60 of FIG. 7 is a functional representation of this first counter.
- the diagnostic method according to the embodiment of the invention uses a second counter which stores the revolutions of revolution made by the electromechanical clutch in sliding and overheating conditions. For this, revolutions are counted as long as the current is in the "WarningLevel2" state.
- Block 40 of FIG. 6 functionally represents this evaluation of overheating, relayed by the variable "OverheatStatus".
- the first sub-counter 70 called “OverheatClutchRev”
- the second sub-counter 80 counts the number of occurrences of 50 turns in a range, for example from 0 to 255 towers. Once the counter has reached its maximum value, the one is saturated with this last value. It is incremented as soon as the first sub-counter reaches the value of 50, the latter then going back to zero.
- the preceding counters have been described by way of non-limiting example.
- the concept of the invention could be implemented with any other means taking into account the particular events premature aging of the transmission system of the motor vehicle.
- the counting of the number of overheating states is advantageous in that it represents the thermal shock experienced by the transmission system
- the counting of the number of superheated turns of the coupler is advantageous in that it represents a wear by thermal stress of the mechanical organs involved.
- All of these counters make it possible, on the one hand, to identify, for example, a possible dispersion of the coupler but above all to represent the use and the solicitations encountered, in a way the history experienced by the vehicle through its transmission system. type four-wheel drive.
- the control system can adapt its operating strategies according to the levels of these counters (described p10).
- these meters can constitute a statistical database to improve future vehicle developments.
- the invention relates to a method for diagnosing a transmission system of a four-wheel drive motor vehicle comprising a step of estimating the state of wear of the transmission system from extreme events that he suffered during his operation.
- the method further comprises a step of informing the result of the diagnostic process to the driver of the motor vehicle by a human machine interface of the motor vehicle.
- this diagnostic method is exploited in different ways.
- any maintenance operation of a motor vehicle it is possible to deduce an accurate estimate of the state of the transmission system, specifically the actuator of its coupler.
- the control system 12 may, depending on the state of the diagnostic process, modify its operation to adapt to its state of wear and or stress.
- the control system can go as far as proposing to go into degraded mode.
- the changes can then be all or part of the following alterations:
- the diagnostic and control methods of the transmission system of the motor vehicle described above are implemented by hardware (hardware) and software (software) of the control system 12, mainly with the aid of its computer and a or several associated memories.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR112012025631A BR112012025631A2 (en) | 2010-04-12 | 2011-04-11 | diagnostic process of a transmission system, coupling command process of an automotive vehicle, computer readable data logging support, coupler control system, automotive vehicle and computer program. |
RU2012147786/11A RU2577406C2 (en) | 2010-04-12 | 2011-04-11 | Diagnostics of mechanical engagement between vehicle first and second wheel axles |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1052782 | 2010-04-12 | ||
FR1052782A FR2958612B1 (en) | 2010-04-12 | 2010-04-12 | METHOD FOR DIAGNOSING A MECHANICAL COUPLING MEANS OF THE FIRST AND SECOND AXLES OF A MOTOR VEHICLE |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2011128567A1 true WO2011128567A1 (en) | 2011-10-20 |
Family
ID=43016578
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2011/050824 WO2011128567A1 (en) | 2010-04-12 | 2011-04-11 | Method for the diagnosis of a means for the mechanical coupling of first and second axles of a motor vehicle |
Country Status (4)
Country | Link |
---|---|
BR (1) | BR112012025631A2 (en) |
FR (1) | FR2958612B1 (en) |
RU (1) | RU2577406C2 (en) |
WO (1) | WO2011128567A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012110661A1 (en) * | 2011-02-18 | 2012-08-23 | Land Rover | Vehicle, and method and system of controlling a vehicle |
US11371602B1 (en) | 2021-01-26 | 2022-06-28 | Ford Global Technologies, Llc | Fault detection in an all-wheel-drive system |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3407716A1 (en) * | 1984-03-02 | 1985-09-12 | Robert Bosch Gmbh, 7000 Stuttgart | Device for measuring the thickness of wearing parts |
US5247443A (en) | 1987-12-23 | 1993-09-21 | Dana Corporation | Electronic control for vehicle four wheel drive system |
GB2363436A (en) * | 2000-06-14 | 2001-12-19 | Bosch Gmbh Robert | Calculating brake wear and/or thickness for each wheel of a vehicle and use of a polynomial wear model |
DE10131434A1 (en) * | 2001-06-29 | 2003-01-16 | Daimler Chrysler Ag | Electronic clutch wear index computer stage for use in road vehicle automatically computes new value dependent on adaptation parameter following each adaptation process by controller |
US20030098193A1 (en) | 2001-11-26 | 2003-05-29 | Hitachi Unisia Automotive, Ltd. | Four-wheel drive control system and method |
WO2005009774A1 (en) * | 2003-07-24 | 2005-02-03 | Bayerische Motoren Werke Aktiengesellschaft | Control device for an at least partially four-wheel driven motor vehicle |
DE102008001803A1 (en) * | 2008-05-15 | 2009-11-19 | Robert Bosch Gmbh | Method for detecting an operating age of a component of a hybrid vehicle |
FR2933913A1 (en) * | 2008-07-16 | 2010-01-22 | Renault Sas | CONTROL DEVICE ADAPTIVE TO THE EVOLUTION OF THE CHARACTERISTIC OF A CLUTCH BASED ON THE TEMPERATURE APPLIED TO A VEHICLE EQUIPPED WITH A 4X4 PILOT SYSTEM. |
-
2010
- 2010-04-12 FR FR1052782A patent/FR2958612B1/en active Active
-
2011
- 2011-04-11 RU RU2012147786/11A patent/RU2577406C2/en active
- 2011-04-11 WO PCT/FR2011/050824 patent/WO2011128567A1/en active Application Filing
- 2011-04-11 BR BR112012025631A patent/BR112012025631A2/en not_active Application Discontinuation
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3407716A1 (en) * | 1984-03-02 | 1985-09-12 | Robert Bosch Gmbh, 7000 Stuttgart | Device for measuring the thickness of wearing parts |
US5247443A (en) | 1987-12-23 | 1993-09-21 | Dana Corporation | Electronic control for vehicle four wheel drive system |
GB2363436A (en) * | 2000-06-14 | 2001-12-19 | Bosch Gmbh Robert | Calculating brake wear and/or thickness for each wheel of a vehicle and use of a polynomial wear model |
DE10131434A1 (en) * | 2001-06-29 | 2003-01-16 | Daimler Chrysler Ag | Electronic clutch wear index computer stage for use in road vehicle automatically computes new value dependent on adaptation parameter following each adaptation process by controller |
US20030098193A1 (en) | 2001-11-26 | 2003-05-29 | Hitachi Unisia Automotive, Ltd. | Four-wheel drive control system and method |
WO2005009774A1 (en) * | 2003-07-24 | 2005-02-03 | Bayerische Motoren Werke Aktiengesellschaft | Control device for an at least partially four-wheel driven motor vehicle |
DE102008001803A1 (en) * | 2008-05-15 | 2009-11-19 | Robert Bosch Gmbh | Method for detecting an operating age of a component of a hybrid vehicle |
FR2933913A1 (en) * | 2008-07-16 | 2010-01-22 | Renault Sas | CONTROL DEVICE ADAPTIVE TO THE EVOLUTION OF THE CHARACTERISTIC OF A CLUTCH BASED ON THE TEMPERATURE APPLIED TO A VEHICLE EQUIPPED WITH A 4X4 PILOT SYSTEM. |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012110661A1 (en) * | 2011-02-18 | 2012-08-23 | Land Rover | Vehicle, and method and system of controlling a vehicle |
US9238406B2 (en) | 2011-02-18 | 2016-01-19 | Jaguar Land Rover Limited | Vehicle and method of controlling a vehicle |
US11371602B1 (en) | 2021-01-26 | 2022-06-28 | Ford Global Technologies, Llc | Fault detection in an all-wheel-drive system |
Also Published As
Publication number | Publication date |
---|---|
FR2958612A1 (en) | 2011-10-14 |
FR2958612B1 (en) | 2013-04-12 |
BR112012025631A2 (en) | 2017-12-12 |
RU2577406C2 (en) | 2016-03-20 |
RU2012147786A (en) | 2014-05-20 |
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