Sensor assembly for an automated shift transmission and method for detecting interfering magnetic fields

Abstract

The present invention relates to a sensor assembly (46) for an automated shift transmission having a shift device (2) having a plurality of shift levers (4, 14, 24, 34) arranged parallel to each other and axially movable by means of associated shift actuators (8, 18, 28, 38), wherein the sensor assembly (46) has a plurality of displacement sensors (48, 56, 64, 72), each of which consists of a signal generator (50, 58, 66, 74) fastened to one of the shift levers and a signal receiver (52, 60, 68, 76) fixedly arranged relative to the housing, wherein the signal generators are designed as permanent magnets and the signal receivers are designed as 3D Hall sensors, and in the sensor assembly, the signal receivers (52, 60, 68, 76) are connected to an electronic transmission control unit (44) via electrical sensor lines (54, 62, 70, 78). In order to obtain the external interfering magnetic field that may distort the sensor signal of the displacement sensors (48, 56, 64, 72) without additional equipment costs, the following arrangement is made: the signal generators (50, 58, 66, 74) are arranged such that their magnetic poles (N, S) are oriented in the same direction, and the signal receivers (52, 60, 68, 76) are arranged in a common plane (80) that is horizontal in their mounting positions.

Description

Technical Field

[0001] This invention relates to a sensor assembly for an automatic transmission with a shift mechanism having multiple shift levers arranged parallel to each other and axially movable by means of an associated shift actuator. The sensor assembly includes multiple displacement sensors, each consisting of a signal generator fixed to one of the shift levers and a signal receiver fixedly arranged relative to a housing. The signal generators are designed as permanent magnets, and the signal receivers are designed as 3D Hall sensors. In this sensor assembly, the signal receivers are connected to an electronic transmission control unit via electrical sensor wiring. The invention also relates to a method for detecting external interfering magnetic fields using such a sensor assembly. Background Technology

[0002] A vehicle shift transmission with a countershaft structure has at least two parallel driveshafts (e.g., a countershaft and a main shaft) that can be coupled to each other in a driving manner via multiple gear sets with different gear ratios. Each gear set includes at least one fixed gear arranged anti-rotatingly on one driveshaft and a freewheel rotatably supported on the other driveshaft; these gears mesh with each other or via an intermediate gear. These fixed gears and freewheels are typically arranged in pairs on one or the other driveshaft. Between the freewheels of two adjacent gear sets, shift sleeves are arranged anti-rotatingly and axially movable on the respective driveshaft, with shift teeth arranged on both sides of the shift sleeves. Engaging one of the two gear sets in this example and thus engaging it into the relevant transmission stage is achieved by axially moving the shift sleeve in the direction of the freewheel of the relevant gear set, thereby engaging the shift teeth of the shift sleeve with the corresponding teeth of the freewheel. Releasing the engagement of the gear set and disengaging it from the relevant transmission stage is achieved by axially moving the shift sleeve in the opposite direction to a neutral position. A shifting clutch with shift teeth and corresponding teeth can be implemented as a non-synchronous claw clutch or a friction-synchronous clutch.

[0003] To switch gear stages, the shifting mechanism inside a transmission typically has multiple shift levers and multiple shift forks or fork-shaped shift rockers, each pivotable about a transverse axis, arranged parallel to the drive shaft. These shift forks or fork-shaped shift rockers engage in an outer annular groove in one of the shift sleeves. In two-stage shift transmissions (e.g., the split gear group or bereichsgruppe of a grouped transmission), the shift forks are rigidly connected to their respective shift levers, or the shift rockers are form-fitted and permanently coupled to their respective shift levers. In shift transmissions with more than two transmission stages (e.g., the main transmission of a grouped transmission), multiple shift levers can be provided, each rigidly connected to a shift fork or adjustably connected to a shift rocker.

[0004] In manually shiftable transmissions, the shift lever is connected via a linkage or cable to a driver-operated shift lever located in the vehicle's cab. In contrast, in automatically shiftable transmissions, the shift lever can be axially moved by the electronic transmission control unit via an associated shift actuator. This requires associated displacement sensors to determine the shift or selection position of the shift lever and transmit this position to the transmission control unit. Hall effect sensors are preferred as displacement sensors because they are less susceptible to interference and robust against environmental influences such as oil, water splashes, and dirt deposits compared to other types of sensors (e.g., optical or ultrasonic sensors).

[0005] A shifting device for an automated transmission is disclosed in DE 10 2005 015 482 A1. This shifting device has four shift levers arranged with their axes parallel to each other and parallel to the drive shaft. The transmission includes a main transmission with four gear stages, two half-gear groups preceding the main transmission, and two double-gear groups following the main transmission. Each half-gear group and double-gear group is equipped with a shift lever, and axial movement of the shift levers allows switching between the two gear stages of each half-gear group or double-gear group. The main transmission is equipped with two shift levers, which can be selectively moved axially in one direction or the other to switch between two shift positions (in which one of the two gear stages is engaged) and a neutral position (in which the two gear stages are disengaged) located between the two shift positions. Four shift actuators are provided to enable axial movement of the shift lever. These shift actuators are designed as hydraulic or pneumatic piston-cylinder assemblies and are arranged in a common housing at the axial end of the shift lever.

[0006] A typical design and arrangement of a displacement sensor in a transmission shift mechanism is known from DE 2017 002 873A1. This displacement sensor consists of two parts: a signal generator, designed as a permanent magnet, fixed to the shift lever, and a signal receiver, designed as a 3D Hall sensor, arranged in a housing cover. Unlike simple Hall sensors, in a 3D Hall sensor, at least three Hall sensors, each oriented in a different spatial direction, are arranged on an electronic chip. This means that the magnetic field of the associated permanent magnet can be known in three dimensions.

[0007] According to ISO standard 11452-8, Hall effect sensors should be robust against interfering magnetic fields with a strength or flux density up to 4 mT. This is sufficient under normal vehicle operating conditions, as the magnetic field of the permanent magnet used as a signal generator, identified by the Hall effect sensor, has a flux density ranging from 20 mT to 100 mT. However, in some applications, vehicles may encounter areas with strong external interfering magnetic fields with flux densities up to 25 mT, which can interfere with the sensing of shift positioning in automated transmissions. This can occur, for example, in factories such as aluminum smelters, where high-voltage cables with strong surrounding magnetic fields may be laid in the floors or side walls of loading workshops. The same applies to scrap yards and scrap loading points near train stations, where cranes with lifting magnets surrounded by strong magnetic fields are used.

[0008] While it is well known that electronic devices can be completely shielded from external interfering magnetic fields by being arranged within a ferromagnetic hollow body, such shielding devices, for example, composed of ferromagnetic shielding plates, are relatively expensive, often difficult to implement, and typically require large structural spaces.

[0009] Another possibility is to use a sensor to detect external interfering magnetic fields, positioned away from the magnetic field of the permanent magnet used as a signal generator. If an interfering magnetic field is detected, it can be appropriately accounted for when controlling the automatic transmission. However, this comes with increased costs in terms of equipment and control technology.

[0010] For example, DE 10 2014 010 601 A1 provides information about the corresponding sensor assembly of the regulating device, in which a first magnetic field sensor (Hall sensor) detects the positioning of the permanent magnet along the motion path and a second magnetic field sensor detects magnetic interference on the first magnetic field sensor. The second magnetic field sensor is designed as a planar coil or a loop coil and is arranged in a detection plane outside the magnetic field of the permanent magnet, the surface normal of which is perpendicular to the magnetic field component of the permanent magnet detected by the first magnetic field sensor. Summary of the Invention

[0011] Given the high cost of shielding devices or special sensors used to detect the presence of external interfering magnetic fields, the object of this invention is to provide a sensor assembly for an automated transmission of the type described at the outset, which allows the detection of such external interfering magnetic fields without additional equipment costs. Another object is to describe a method for detecting external interfering magnetic fields using such a sensor assembly.

[0012] Therefore, the present invention relates to a sensor assembly for an automated shift transmission having a shifting device having a plurality of shift levers arranged parallel to each other and axially movable by means of an associated shift actuator, wherein the sensor assembly has a plurality of displacement sensors, each of which consists of a signal generator fastened to one of the shift levers and a signal receiver fixedly arranged relative to the housing, wherein the signal generators are designed as permanent magnets and the signal receivers are designed as 3D Hall sensors, and in the sensor assembly, the signal receivers are connected to an electronic transmission control unit via electrical sensor wiring.

[0013] To address the tasks associated with the device, the sensor assembly is configured such that the signal generators are arranged with their magnetic poles N and S oriented in the same direction, and the signal receivers are arranged in a common, horizontal plane in their mounting positions.

[0014] External interfering magnetic fields may be located to the side, above, or below the vehicle, for example, generated by high-voltage cables laid in walls or floors. However, external interfering magnetic fields may also be generated by lifting magnets fixed to crane booms and located above the vehicle. Since the displacement sensors are very close to each other, and it is assumed that the strength or magnetic flux density of the interfering field is constant at a certain height above the ground, the permanent magnets' poles (N, S) are axially oriented in the same direction, and the permanent magnets and 3D Hall sensors are arranged in a common, horizontal plane in their mounting positions. This means that the interference signals detected by the Hall sensors have approximately the same intensity and time profile. Therefore, by evaluating the sensor signals of all Hall sensors, the presence of strong interfering magnetic fields that distort the positioning information of the Hall sensors can be detected.

[0015] The present invention also relates to a method for detecting external interfering magnetic fields by means of a sensor assembly of an automated shift transmission having a shifting device having a plurality of shift levers arranged parallel to each other's axes and axially movable by means of an associated shift actuator. The sensor assembly has a plurality of displacement sensors, each consisting of a signal generator fixed to one of the shift levers and a signal receiver fixedly arranged relative to a housing. The signal generators are each designed as permanent magnets, and the signal receivers are each designed as 3D Hall sensors. The signal receivers are connected to an electronic transmission control unit via electrical sensor wiring. Furthermore, the signal generators are arranged such that their magnetic poles, for example (N, S), are axially oriented in the same direction, and the signal receivers are arranged in a common, horizontal plane in their mounting positions.

[0016] To address the problems related to the method, the present invention provides that: within a specified time period Δt... S The receiver detects sensor signals and stores the current signal values ​​x of these sensor signals. S And the presence of an external interfering magnetic field is identified when the signal values ​​x of at least two signal receivers are: S Simultaneously, there is a change in the signal value, but the shifting process of the transmission is not triggered beforehand. Time period Δt S It can range from a few milliseconds to hundreds of milliseconds.

[0017] External interfering magnetic fields may occur under five different vehicle operating conditions:

[0018] - The vehicle is in an inactive interference magnetic field area when the electrical system is on, and the interference magnetic field is activated.

[0019] - The vehicle is in an active interfering magnetic field area with its electrical system off, and the electrical system is turned on.

[0020] - The vehicle entered an active, interfering magnetic field.

[0021] - The vehicle drove through an active, interfering magnetic field.

[0022] - The vehicle is in an inactive interference magnetic field area when the electrical system is on, and the interference magnetic field is turned on and off again.

[0023] Because the shift lever of a gearbox adjusts at a speed significantly higher than the vehicle's maximum speed of 30 km / h near the loading point (where such interference fields may occur), changes in sensor signal values ​​can be clearly distinguished from changes in sensor signals caused by the shifting or selection process. Similarly, the passage through interfering magnetic fields or the opening and closing of interfering magnetic fields can be identified based on the time curves of the sensor signals.

[0024] To evaluate the signal value change of the sensor signal, the extended scheme of the above method is configured as follows: for each signal receiver, the last detected signal value x is generated. S average x S_M Defined at each average x S_M The tolerance range Δx of the surrounding signal values S_T It is stipulated that in each average value x S_M The outermost interference range Δx of the surrounding signal values S_S And it specifies the observation period Δt, which includes the last detected sensor signal of each. B In this embodiment, the tolerance range Δx S_T The width of the interference field corresponds in both directions to the strength or flux density of the interfering magnetic field that the signal receiver can tolerate (here, + / - 4 mT). In this embodiment, the interference range Δx S_S The width from the average x S_M The initial two directions correspond to the maximum assumed strength or magnetic flux density of the external disturbance magnetic field (here, + / - 25 mT), and the observation period Δt B Here, a length (Δt) in the single-digit second range is preferred. B = 1 to 9 seconds).

[0025] The following conditions are considered as identifying interfering magnetic fields that jeopardize the normal operation of the shifting device: the shifting process of the shifting transmission is not triggered, and the sensor signals x of all signal receivers are... S1 (t), x S2 (t), x S3 (t), x S4 (t) During the observation period Δt B At the start, t1, and at the end, t2, are either higher or lower than the tolerance range Δx. S_T Moreover, it remains within the mentioned interference range Δx S_S Within.

[0026] In contrast, the following situation is considered an unidentified interfering magnetic field that could jeopardize the normal operation of the shifting device: the shifting process of the gearbox is not triggered, and the sensor signals x of all signal receivers are not detected. S1 (t), x S2 (t), x S3 (t), x S4 (t) during the observation period Δt B Initially, t1 may be higher or lower than the tolerance range Δx S_T And then remain within the interference range Δx S_S Inside, but at least one signal receiver's sensor signal x S2 (t) During the observation period ΔtB The tolerance range Δx has been returned. S_T The last signal curve mentioned corresponds, for example, to a vehicle driving over a high-voltage power cable laid underground or on the ground. Because the interfering magnetic field has a short duration, this can be considered non-critical.

[0027] Similarly, the following situations are considered as not identifying interfering magnetic fields that could jeopardize the normal operation of the shifting equipment: sensor signals x from all signal receivers. S1 (t), x S2 (t), x S3 (t), x S4 (t) During the observation period Δt B Initially, t1 may be higher or lower than the tolerance range Δx S_T However, due to the transmission shifting requirements that occur during this period, at least one signal receiver's sensor signal x S2 (t) During the observation period Δt B The area within the interference range Δx S_S This signal curve corresponds to the shifting process in which the associated shift lever is moved axially, and this shifting process is also detected because the electronic transmission control unit operates the associated shift actuator.

[0028] When an interfering magnetic field with a field strength that may distort the sensor signal of the signal receiver is detected, it can be addressed in various ways. This could involve suppressing signal value updates or preventing gear shifting in the transmission. Alternatively, in this case, the transmission may only be allowed to shift to a specific forward gear and / or a specific reverse gear to escape the interfering magnetic field. This shifting is not dependent on the sensor signal of the signal receiver, but rather on shift control utilizing a relaxed shift interval designed for this type of shifting. Attached Figure Description

[0029] The specification is accompanied by accompanying drawings with embodiments to further illustrate the invention. In the drawings:

[0030] Figure 1 A schematic top view illustrates the shifting device of an automated shift transmission with four shift levers and a sensor assembly with four displacement sensors according to the present invention;

[0031] Figures 2a to 2d show the results according to Figure 1 The first curve of the sensor signal of the four displacement sensors used to detect the external interference magnetic field;

[0032] Figures 3a to 3d show the results according to Figure 1 The second curve of the sensor signals from the four displacement sensors used to detect external interference magnetic fields; and

[0033] Figures 4a to 4d show the results according to Figure 1 The third curve of the sensor signals of the four displacement sensors used to detect external interference magnetic fields. Detailed Implementation

[0034] exist Figure 1 The schematic top view shows the shifting device 2 of an automated shift transmission implemented as a countershaft structure. The transmission is designed as a grouped transmission and includes a four-stage main transmission, two half-gear groups arranged before the main transmission, and two double-gear groups arranged after the main transmission.

[0035] The half-gear group is equipped with a first shift lever 4, which is arranged with its axis parallel to a drive shaft (not shown) and supported in a transmission housing (not shown) in a manner movable axially along a first double-headed arrow 12. A first shift fork 6 is rigidly fastened to the first shift lever 4, which engages, in a manner not shown, with a shift sleeve guided on the drive shaft in a manner resistant to relative rotation and axially movable. Switching between the two gear stages of the half-gear group can be achieved by axially moving the first shift lever 4, thereby actuating the associated shift sleeve. For this purpose, the first shift lever 4 is eccentrically connected to a first shift actuator 8, which is connected to an electronic transmission control unit 44 via a first electrical control line 10. The shift actuator 8 can be a hydraulic or pneumatic piston-cylinder assembly whose pressure chamber can be loaded or unloaded with a pressure medium via a solenoid valve. However, an electric or electromagnetic design for the first shift actuator 8 and all other shift actuators 18, 28, 38 is also possible.

[0036] The main transmission is equipped with second and third shift levers 14 and 24, which are arranged with their axes parallel to each other and parallel to the drive shaft and the first shift lever 4 of the half-gear group. These two shift levers 14 and 24 are supported in the transmission housing in a manner that allows them to move axially along the second and third bidirectional arrows 22 and 32. Shift forks 16 and 26 are rigidly fastened to each of the two shift levers 14 and 24, respectively, and these shift forks engage, in a manner not shown, with shift sleeves guided on the drive shaft in a manner resistant to relative rotation and axially movable. By axially moving one of the two shift levers 14 and 24, thereby actuating the shift sleeves engaged with the corresponding shift forks 16 and 26, shifting can be performed accordingly between a shift position and a neutral position (in which the two drive stages are engaged) of the main transmission. For this purpose, the second and third shift levers 14 and 24 are connected to the corresponding second or third shift actuators 18 and 28, which are connected to the electronic transmission control unit 44 via electrical control lines 20 and 30, respectively.

[0037] The double-gear group of the multi-gear transmission is equipped with a fourth shift lever 34, which is arranged parallel to the drive shaft and the axes of the other three shift levers 4, 14, and 24, and supported in the transmission housing in a manner that allows axial movement along the fourth bidirectional arrow 42. A fourth shift fork 36 is rigidly fastened to the fourth shift lever 34, which engages, in a manner not shown, with a shift sleeve guided on the drive shaft in a manner resistant to relative rotation and capable of axial movement. By axially moving the fourth shift lever 34 and thereby actuating the shift sleeve, switching can be performed between the two gear poles of the double-gear group. For this purpose, the fourth shift lever 34 is adjustedly connected to a fourth shift actuator 38, which is connected to the electronic transmission control unit 44 via electrical control lines 40.

[0038] The associated sensor assembly 46 includes four displacement sensors 48, 56, 64, and 72. Each of these displacement sensors 48, 56, 64, and 72 comprises two components: signal generators 50, 58, 66, and 74, which are respectively fixed to one of the four displacement sensor shift levers 4, 14, 24, and 34 and are designed as permanent magnets; and signal receivers 52, 60, 68, and 76, which are designed as 3D Hall sensors and are fixedly arranged relative to the housing. The signal receivers 52, 60, 68, and 76 are connected to the electronic transmission control unit 44 via associated electrical sensor lines 54, 62, 70, and 78.

[0039] According to the present invention, signal generators 50, 58, 66, and 74, designed as permanent magnets (their magnetic poles N and S having the same axial orientation), and signal receivers 52, 60, 68, and 76, designed as 3D Hall sensors, are arranged in a common, horizontal plane 80 in their mounting positions. Figure 1 In this context, the horizontal plane 80 corresponds to the plane in the attached drawing. The components of the displacement sensors 48, 56, 64, and 72 according to the invention ensure that the effect of an external interfering magnetic field on all four signal receivers 52, 60, 68, and 76 or the 3D Hall sensor is substantially the same. This allows for the evaluation of the sensor signals x of all signal receivers 52, 60, 68, and 76. S1 x S2 x S3 x S4 The presence of a strong interfering magnetic field was identified, which would distort the adjustment and positioning signals of signal receivers 52, 60, 68, and 76.

[0040] The signal receivers 52, 60, 68, and 76, designed as Hall effect sensors, receive sensor signals x. S1 x S2 x S3 x S4 With the specified time period ΔtS The form of adjustment and positioning sensed internally is detected and stored as the current signal value x of each Hall sensor 52, 60, 68, 76. S_akt The presence of an external interfering magnetic field is identified when there is no active shift request or no current transmission shift, and the last detected sensor signal x of all signal receivers 52, 60, 68, and 76 is... S Simultaneously, there are signal value changes. Since the adjustment speeds of shift levers 4, 14, 24, and 34 are significantly higher than the vehicle's maximum speed of 30 km / h near the loading point, the sensor signal x can be... S1 x S2 x S3 x S4 The changes in the signal value can be clearly distinguished from the changes in the sensor signal caused by gear shifting or selection. Similarly, this can be based on the sensor signal x. S The time curve (t) identifies the passage through the interfering magnetic field or the opening and closing of the interfering magnetic field.

[0041] The setup for this is: to generate the final detected sensor signal x. S average x S_M To evaluate the sensor signal x of each signal receiver 52, 60, 68, 76 S The signal value change of (t). For each average value x S_M Define sensor signal x S The tolerance range Δx of (t) is relatively close to the inner edge. S_T and the outer interference range Δx S_S The tolerance range Δx is relatively close to the inner limit. S_T The value is less than the outermost interference range Δx S_S The value is also specified, including the last detected sensor signal x. S Observation period Δt B .

[0042] Tolerance range Δx S_T The width of the interference magnetic field in each of the two directions corresponds to the strength or flux density of the interfering magnetic field that the signal receiver can tolerate (e.g., + / - 4 mT). Interference range Δx S_S The width of the field corresponds in both directions to the maximum assumed strength or magnetic flux density of the external interfering magnetic field (here, for example, + / - 25 mT). The observation period Δt B It is defined as a single-digit range of seconds and in this embodiment can be between 1 second and 9 seconds.

[0043] The sensor signal x from the four signal receivers 52, 60, 68, and 76, designed as a 3D Hall sensor, is...S1 (t), x S2 (t), x S3 (t), x S4 The assessment of the time curve (t) in relation to the presence of the interfering magnetic field will be described below with reference to the three examples shown in Figures 2a, 2b, 2c, 2d; 3a, 3b, 3c, 3d; and 4a, 4b, 4c, 4d.

[0044] As can be seen in the first example shown in Figures 2a, 2b, 2c, and 2d: the sensor signals x of all four signal receivers 52, 60, 68, and 76, which are designed as 3D Hall sensors, are... S1 (t), x S2 (t), x S3 (t), x S4 The signal value x of (t) S During the observation period Δt B At the start (time t1) and during the observation period Δt B At the end (time t2), it is higher than the inner tolerance range Δx. S_T Moreover, the interference range Δx remains on the outer edge. S_S Within. Due to the sensor signal x S1 (t), x S2 (t), x S3 (t), x S4 The detected signal values ​​change roughly the same across all time curves of (t), and there is no active shifting requirement, thus identifying the presence of a critical external magnetic field under these circumstances.

[0045] In the second example shown in Figures 3a, 3b, 3c, and 3d, it can be seen that: according to Figures 3a, 3c, and 3d, the sensor signals x of the first, third, and fourth signal receivers 52, 68, and 76 S1 (t), x S3 (t), x S4 The signal value x of (t) S During the observation period Δt B At the start (time t1) and during the observation period Δt B At the end (time t2), it is higher than the inner tolerance range Δx. S_T And remain in the outermost interference range Δx S_S Within. In contrast, according to Figure 3b, the sensor signal x of the second signal receiver 60 S2 The signal value x of (t) S Although during the observation period Δt B Initially (time t1), it is higher than the inner tolerance range Δx. S_T However, the observation period Δt BThe time t2' before the end returned to the tolerance range Δx S_T In the middle. Because there is no active gear shifting requirement and the sensor signal x of the second signal receiver 60. S2 The time curve (t) shows the sensor signals x of all signal receivers 52, 60, 68, and 76. S1 (t), x S2 (t), x S3 (t), x S4 (t) is only affected in the short term, and this situation is assessed as the absence of a critical external interfering magnetic field.

[0046] As can be seen in the third example shown in Figures 4a, 4b, 4c, and 4d, the sensor signals x of the first, third, and fourth signal receivers 52, 68, and 76 are as follows: S1 (t), x S3 (t), x S4 The signal value x of (t) S During the observation period Δt B At the start (time t1) and during the observation period Δt B At the end (time t2), it is higher than the inner tolerance range Δx. S_T Moreover, the interference range Δx remains on the outer edge. S_S Within. In contrast, according to Figure 4b, the sensor signal x of the second signal receiver 60 S2 The signal value x of (t) S During the observation period Δt B At the beginning (time t1), it was already higher than the inner tolerance range Δx. S_T However, shortly thereafter at t1', due to shift requirements or transmission shifts occurring during this period, the disturbance range exceeds the outermost range Δx. S_S Therefore, in this case, it can also be considered that no dangerous interfering magnetic field has been identified. (See attached list of reference numerals, part of the specification.)

[0047] 2. Gear shifting equipment

[0048] 4 First gear shift lever

[0049] 6 First shift fork

[0050] 8 First shift actuator

[0051] 10 Control circuit

[0052] 12 First double-headed arrow

[0053] 14 Second gear shift lever

[0054] 16 Second shift fork

[0055] 18 Second shift actuator

[0056] 20 Control circuit

[0057] 22 Second double-headed arrow

[0058] 24 Third gear shift lever

[0059] 26 Third shift fork

[0060] 28 Third shift actuator

[0061] 30 Control circuit

[0062] 32 Third double-headed arrow

[0063] 34 Fourth gear shift lever

[0064] 36 Fourth shift fork

[0065] 38 Fourth gear shift actuator

[0066] 40 Control circuit

[0067] 42. Fourth double-headed arrow

[0068] 44 Electronic transmission control unit (ECU)

[0069] 46 Sensor Components

[0070] 48 First displacement sensor

[0071] 50 First signal generator, permanent magnet

[0072] 52 First signal receiver, 3D Hall sensor

[0073] 54 Sensor Circuit

[0074] 56 Second Displacement Sensor

[0075] 58. Second signal generator, permanent magnet

[0076] 60 Second signal receiver, 3D Hall sensor

[0077] 62 Sensor Circuit

[0078] 64 Third displacement sensor

[0079] 66. Third signal generator, permanent magnet

[0080] 68 Third signal receiver, 3D Hall sensor

[0081] 70 Sensor Circuit

[0082] 72 Fourth displacement sensor

[0083] 74. Fourth signal generator, permanent magnet

[0084] 76. Fourth signal receiver, 3D Hall sensor

[0085] 78 Sensor Circuit

[0086] 80 horizontal plane

[0087] N North Magnetic Pole

[0088] S South Magnetic Pole

[0089] t time

[0090] t1 and t2 time points

[0091] t1' and t2' time points

[0092] Δt B Observation period

[0093] Δt S Time period

[0094] x S The signal value of the sensor signal; signal value

[0095] x S (t) Time curve of sensor signal

[0096] x S1 (t) Time curve of the sensor signal from the first signal receiver

[0097] x S2 (t) Time curve of the sensor signal from the second signal receiver

[0098] x S3 (t) Time curve of the sensor signal from the third signal receiver

[0099] x S4 (t) Time curve of the sensor signal from the fourth signal receiver

[0100] x S_akt Current signal value

[0101] x S_M Average value of signal

[0102] Δx S_T Tolerance range of signal values

[0103] Δx S_S Interference range of signal value

Claims

1. A method for detecting external interfering magnetic fields by means of a sensor assembly (46) of an automated shift transmission, the shift transmission having a shifting device (2) having a plurality of shift levers (4, 14, 24, 34) arranged parallel to each other and axially movable by means of associated shift actuators (8, 18, 28, 38), wherein, The sensor assembly (46) has multiple displacement sensors (48, 56, 64, 72), each displacement sensor consisting of a signal generator (50, 58, 66, 74) fastened to one of the shift levers (4, 14, 24, 34) and a signal receiver (52, 60, 68, 76) fixedly arranged relative to the housing. The signal generators (50, 58, 66, 74) are designed as permanent magnets, and the signal receivers (52, 60, 68, 76) are designed as 3D Hall sensors. In the sensor assembly, the signal receivers (52, 60, 68, 76) are connected to the electronic transmission control unit (44) via electrical sensor lines (54, 62, 70, 78). The signal generators (50, 58, 66, 74) are arranged such that their magnetic poles (N, S) are oriented in the same direction, and the signal receivers (52, 60, 68, 76) are arranged in a common, horizontal plane (80) in their mounting positions. Its characteristic is that, within a specified time period (Δt) S The sensor signals of the signal receivers (52, 60, 68, 76) are detected and their current signal values ​​(x) are stored. S ), and the presence of an external interfering magnetic field is identified when the shifting process of the transmission is not triggered, and the signal values ​​(x) of at least two signal receivers (52, 60, 68, 76) are [missing information]. S It also exhibits signal value changes.

2. The method according to claim 1, characterized in that, To evaluate the signal value changes of each signal receiver (52, 60, 68, 76), the final detected signal value (x) is formed. S The average value (x) S_M ), defined in each mean (x S_M The tolerance range (Δx) of the surrounding signal values. S_T ), specifying that in each average value (x) S_M The outermost interference range of the surrounding signal value (Δx) S_S The observation period (Δt) is specified to include the last detected sensor signal for each sensor. B The tolerance range (Δx) S_T The width of the interference range (Δx) corresponds to an intensity of + / -4 mT of the interfering magnetic field that the signal receivers (52, 60, 68, 76) can tolerate in both directions. S_S The width of ) from the average (x S_M The two directions at the beginning are respectively equivalent to the maximum assumed intensity of the external disturbance magnetic field of + / -25mT, and the observation period (Δt) is... B () is defined as a range of single-digit seconds.

3. The method according to claim 2, characterized in that, The following conditions are considered as identifying interfering magnetic fields that endanger the normal operation of the shifting device (2): the shifting process of the shifting transmission is not triggered, and the sensor signals (x) of all signal receivers (52, 60, 68, 76) are not detected. S1 (t), x S2 (t), x S3 (t), x S4 (t) during the observation period (Δt) B The beginning (t1) and end (t2) are higher or lower than the tolerance range (Δx). S_T ), and remain within the interference range (Δx) S_S Within.

4. The method according to claim 2, characterized in that, The following situations are considered as failure to identify interfering magnetic fields that endanger the normal operation of the shifting device (2): the shifting process of the shifting transmission is not triggered, and the sensor signals (x) of all signal receivers (52, 60, 68, 76) are not detected. S1 (t), x S2 (t), x S3 (t), x S4 (t) during the observation period (Δt) B At the beginning (t1), it is higher or lower than the tolerance range (Δx). S_T ), and then remain within the interference range (Δx) S_S Within ), but at least one signal receiver's sensor signal (x) S2 (t) during the observation period (Δt) B It returned to the tolerance range (Δx) within the specified range. S_T )middle.

5. The method according to claim 2, characterized in that, The following are considered as unidentified interfering magnetic fields that could jeopardize the normal operation of the shifting device (2): sensor signals (x) from all signal receivers (52, 60, 68, 76) S1 (t), x S2 (t), x S3 (t), x S4 (t) during the observation period (Δt) B At the beginning (t1), it is higher or lower than the tolerance range (Δx). S_T However, due to a shift requirement during this period, the sensor signal (x) of at least one signal receiver... S2 (t) during the observation period (Δt) B Within the interference range (Δx), S_S ).

6. The method according to any one of claims 1 to 5, characterized in that, When a high-intensity interfering magnetic field that would distort the sensor signal of the signal receivers (52, 60, 68, 76) is identified, the update of the signal value is suppressed.

7. The method according to any one of claims 1 to 5, characterized in that, When a high-intensity interfering magnetic field that would distort the sensor signals of the signal receivers (52, 60, 68, 76) is detected, the shifting of the gear transmission is prevented.

8. The method according to any one of claims 1 to 5, characterized in that, When a high-intensity interfering magnetic field is identified that would distort the sensor signals of the signal receivers (52, 60, 68, 76), the shift transmission is only allowed to shift to a specific forward gear and / or a specific reverse gear in order to leave the interfering magnetic field. This shifting is not performed in reliance on the sensor signals of the signal receivers (52, 60, 68, 76), but rather by utilizing a relaxed shifting period designed for this shifting.

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