EP4413329A1 - Verfahren zum betrieb eines erfassungssystems und erfassungssystem - Google Patents
Verfahren zum betrieb eines erfassungssystems und erfassungssystemInfo
- Publication number
- EP4413329A1 EP4413329A1 EP22783445.4A EP22783445A EP4413329A1 EP 4413329 A1 EP4413329 A1 EP 4413329A1 EP 22783445 A EP22783445 A EP 22783445A EP 4413329 A1 EP4413329 A1 EP 4413329A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- motion sensor
- counter
- detection system
- incremental
- limit value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/142—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices
- G01D5/145—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices influenced by the relative movement between the Hall device and magnetic fields
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/30—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapers; for testing the alignment of axes
- G01B7/315—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapers; for testing the alignment of axes for testing wheel alignment
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
- G01D3/08—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups with provision for safeguarding the apparatus, e.g. against abnormal operation, against breakdown
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06M—COUNTING MECHANISMS; COUNTING OF OBJECTS NOT OTHERWISE PROVIDED FOR
- G06M1/00—Design features of general application
- G06M1/27—Design features of general application for representing the result of count in the form of electric signals, e.g. by sensing markings on the counter drum
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06M—COUNTING MECHANISMS; COUNTING OF OBJECTS NOT OTHERWISE PROVIDED FOR
- G06M3/00—Counters with additional facilities
- G06M3/12—Counters with additional facilities for preventing incorrect actuation, e.g. for preventing falsification
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D15/00—Steering not otherwise provided for
- B62D15/02—Steering position indicators ; Steering position determination; Steering aids
- B62D15/021—Determination of steering angle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0457—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such
- B62D5/0481—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such monitoring the steering system, e.g. failures
- B62D5/049—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such monitoring the steering system, e.g. failures detecting sensor failures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B2210/00—Aspects not specifically covered by any group under G01B, e.g. of wheel alignment, caliper-like sensors
- G01B2210/10—Wheel alignment
- G01B2210/26—Algorithms, instructions, databases, computerized methods and graphical user interfaces employed by a user in conjunction with the wheel aligner
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D2205/00—Indexing scheme relating to details of means for transferring or converting the output of a sensing member
- G01D2205/20—Detecting rotary movement
- G01D2205/26—Details of encoders or position sensors specially adapted to detect rotation beyond a full turn of 360°, e.g. multi-rotation
Definitions
- angle of rotation sensors and/or linear path sensors are usually designed as incremental or partially incremental sensors.
- partially incremental sensors only a partial segment of the movement (rotation or translation) that can be performed by the component can be directly detected by the corresponding sensor. This sub-segment is referred to below as the measurement segment. If the measurement segment that can be detected by the sensor is exceeded by a progressive movement of the component to be monitored, an incremental counter assigned to the sensor is incremented or decremented and the measurement segment is then passed through again.
- the current value of a rotation angle or a linear displacement can be determined on the basis of the output signal of the sensor, which is within the measurement segment is proportional to a corresponding rotation or translational, in particular linear, displacement of the movably mounted component.
- the angle of rotation can be read from the output signal of the sensor, since the output signal is proportional to the rotational angle of the rotationally mounted component within the partial angle segment.
- an incremental counter is incremented or decremented and the partial angle segment is passed through again during a further rotation of the rotary component. The incremental counter is incremented or decremented depending on whether the partial angle segment falls below or reaches an upper or lower limit value. It can be provided that when an upper limit value is reached or exceeded, the incremental counter is incremented and when it is reached or
- An example of this is the monitoring or recording of the current steering angle in a vehicle, in particular an automobile.
- vehicles that use steer-by-wire systems and where there is no mechanical connection between the steering wheel and the steered wheels require an accurate and reliable detection of the current steering angle, since the steered wheels of the vehicle are aligned solely on the basis of the sensor-detected angle of rotation of the steering wheel become.
- a discrepancy between the sensor-detected current steering angle of the wheels and the actual steering angle of the wheels can therefore lead to situations that seriously endanger the safe operation of the vehicle and/or the health of the driver or other occupants.
- the rotational movement of a rotationally mounted component can be geared down for sensory detection via at least one gear in such a way that several complete revolutions of a rotationally mounted component or the entire permissible rotational angle range of a rotationally mounted component can be mapped to the measuring segment ( ⁇ 360°) of a rotational angle sensor or can be recorded.
- a complete rotation of a rotationally mounted component corresponds to the frame of the present invention, a rotation of 360° (angular degrees).
- the gearing down of translational, in particular linear, movements of translationally mounted components can also be provided accordingly.
- a method for operating at least one detection system for detecting a, in particular current, position and/or a, in particular current, angle of rotation of a movably mounted component, the detection system comprising at least three, in particular partially incremental, motion sensors for independent and/or redundant monitoring of the movably mounted component, at least the following steps being carried out for each motion sensor: a) Evaluation of an output signal of the respective motion sensor and detection of at least one falling below or reaching a lower limit value and exceeding or reaching an upper limit value by the output signal, wherein the lower limit value and the upper limit value limit a measurement segment that can be detected by the motion sensor, b) incrementing or decrementing an incremental counter assigned to the respective motion sensor at least if the output signal has detected that the output signal has fallen below or reached the lower limit value or exceeded or reached the upper limit value , wherein the following step is additionally carried out: c) retrieving and comparing the counter readings of the incremental counters assigned to the motion sensors to detect an incorrect counter reading of at least one incremental counter
- the detection system serving to detect a current angle of rotation and/or a current position of a movably, preferably rotationally or translationally, mounted component.
- the detection system comprises at least three, in particular partially incremental, motion sensors for independent and/or redundant and/or multi-channel monitoring or detection of the current angle of rotation and/or the current position of the movably mounted component.
- the use of at least three motion sensors offers the advantage that if an erroneous measured value of a motion sensor is detected, not only the mere presence of an error can be determined per se, but also a conclusion can be drawn as to which of the motion sensors is faulty, which in turn Implementation of a corresponding error correction allows.
- all movement sensors of the detection system are designed to monitor a similar or the same movement of the movably mounted component.
- all movement sensors are designed as rotation angle sensors for monitoring or detecting a current rotation angle of the movably, in particular rotationally, mounted component.
- all motion sensors are designed as path sensors, in particular linear path sensors, for monitoring or detecting a current position of the movably, in particular translatory or linear, mounted component.
- the movably mounted component can preferably be a rotationally mounted component.
- the movably mounted component can also be a translationally mounted component, with the mounting being designed in particular in such a way that a linear translational movement can be carried out by the component.
- At least one motion sensor can be designed as a partially incremental motion sensor.
- a partially incremental motion sensor is designed to detect a movement, in particular a rotation or a, preferably linear, translation, of a movably mounted component via a measuring segment, in particular continuously or quasi-continuously and/or time-resolved, with in particular a The output signal is proportional to the movement of the movably mounted component within the measuring segment.
- a current position or a current angle of rotation of the movably mounted component within the measurement segment that can be detected by the motion sensor can thus be determined via the output signal.
- the incremental counter is incremented or decremented as a function of falling below and/or reaching the lower limit or exceeding and/or reaching the upper limit of the measurement segment that can be detected by the movement sensor.
- the monitoring of a rotationally mounted component by at least one rotation angle sensor it can be provided that when the rotationally mounted component rotates clockwise, the measurement segment of the rotation angle sensor is passed from the lower limit value of the measurement segment in the direction of the upper limit value of the measurement segment and the incremental counter assigned to the angle of rotation sensor is incremented with the value +1 when the upper limit value is exceeded or reached. The counter reading is thus increased by the value one.
- At least two, preferably all, motion sensors of a detection system are designed for detection in the same measuring segment or the range of motion spanned by the measuring segment, in particular angular range or, preferably linear, travel range, with at least two motion sensors , especially all motion sensors, is the same size.
- the measuring segment covers a rotation angle range from 0° to less than 360° (angle degrees), in particular from 0° to less than or equal to 240° (angle degrees), preferably from 0° to less or equal to 180° (degrees of angle), particularly preferably from 0° to less than or equal to 120° (degrees of angle). If the measuring segment extends from 0° to 120°, for example, then the measuring range covered by the measuring segment of the motion sensor is 120° (angular degrees).
- the current position detected by a partially incremental motion sensor or the current angle of rotation detected by a partially incremental motion sensor of a movably mounted component monitored by the motion sensor can be determined by multiplying the counter reading of the incremental counter assigned to the motion sensor by the measuring range covered by the measuring segment of the motion sensor (e.g. a total detectable total length in the measuring segment or a total detectable angular range in the measuring segment) and a subsequent addition with the value that can be read or determined from the output signal of the motion sensor within the measuring segment that can be detected by the motion sensor.
- the measurement range covered by the measurement segment of the motion sensor can be, for example, a distance covered by the measurement segment as a whole or an angular range covered as a whole by the measurement segment.
- the counter reading is changed or corrected by preceding arithmetic operations, in particular at least one division without remainder. This can be necessary in particular if the incremental counter is not only incremented or decremented when an upper or lower limit value of the measuring segment is exceeded and/or reached or fallen below and/or reached, but also when the measuring segment exceeds and/or reaches or Falling below and/or reaching at least one additional limit value within the measurement segment or between the upper and lower limit value.
- step a) of the method according to the invention the output signal of at least one motion sensor or the output signals of all motion sensors are evaluated and at least one of the output signals falling below or reaching a lower limit value and exceeding or reaching an upper limit value is detected by the output signal, with the lower limit value and the upper limit value delimit a measurement segment that can be detected by the movement sensor.
- the detection is carried out with the aim of determining whether the incremental counter assigned to the motion sensor needs to be incremented or decremented and in which direction the incremental counter must be incremented or decremented. Provision can be made for step a) to be carried out continuously or quasi-continuously.
- step a) is therefore necessary in order to correctly detect the current angle of rotation or the current position of a movably mounted component by at least one motion sensor even if the angle of rotation of the movably mounted component or the preferably linear distance covered by the movably mounted component is greater than the measuring segment that can be detected by the motion sensor.
- the output signal of at least one motion sensor has or can have a sawtooth structure or a sawtooth-shaped profile, at least in sections, with a sawtooth in particular marking the complete or one-time crossing of the measuring segment that can be detected by the motion sensor.
- the output signal of at least one motion sensor in the case of a progressive movement of the movably mounted component monitored by the motion sensor over a range of motion that is a multiple, in particular at least twice, of the range of motion covered by the measuring segment of the motion sensor, is several has successive saw teeth, each saw tooth characterizing the complete or one-time crossing of the measurement segment that can be detected by the motion sensor.
- At least one sawtooth has a flank inclined relative to a vertical direction and a flank which is parallel or substantially parallel to the vertical direction.
- at least one sawtooth has an edge with an infinitely large or almost infinitely large gradient and an edge with a finite gradient, the gradient relating to the change in the output signal being related to the change in the movement detected by the motion sensor (linear path or angle of rotation).
- the edge which is inclined relative to the vertical direction causes a continuous rise or fall in the output signal of the movement sensor during the stepping through the measurement segment that can be detected by the movement sensor.
- the edge parallel or substantially parallel to the vertical direction marks the transition from a (e.g. first) passage through the measurement segment that can be detected by the motion sensor to a renewed (e.g. second) passage through the measurement segment that can be detected by the motion sensor and/or or indicates a required incrementing or decrementing of the incremental counter associated with the motion sensor.
- the detection of falling below or reaching a lower limit value and/or exceeding or reaching an upper limit value by the output signal in step a) includes the detection of at least one vertical or essentially vertical edge of the output signal.
- step a) additionally includes a detection of at least one falling below and/or exceeding and/or reaching of at least one intermediate limit value, preferably at least two intermediate limit values.
- step b) of the method according to the invention at least one incremental counter assigned to a motion sensor is incremented or decremented.
- the incrementing or decrementing takes place at least when it has been detected that the value falls below or reaches the lower limit value and/or exceeds or reaches the upper limit value, in particular in step a). Provision can be made for incrementing when the upper limit value is reached or exceeded, and decrementing when the lower limit value is reached or fallen below.
- the current angle of rotation or the current position of a movably mounted component monitored by the motion sensor is determined not only by the current value of the output signal of the motion sensor, but also by taking into account the count of the incremental counter assigned to the motion sensor and thus taking into account an in past single or multiple crossings of the can be determined or can be determined by the motion sensor detectable measurement segment.
- step c) of the method according to the invention the counter readings of the incremental counters assigned to the movement sensors of the detection system are retrieved and compared in order to detect an incorrect counter reading of at least one incremental counter.
- a possibly faulty movement sensor or counter reading of an incremental counter assigned to the movement sensor can be recognized quickly and easily.
- decisions can be made for the further operation of a higher-level system, in particular a vehicle. For example, a decision can be made as to whether the safe operation of the system, in particular the vehicle, can continue to be guaranteed or whether the detected error can be corrected and a reliable and precise detection of the current angle of rotation or the current position of a movably mounted component can be further guaranteed by the registration system.
- the method according to the invention thus has the advantage that even when using partially incremental motion sensors, a reliable and precise statement can be made about the current angle of rotation or the current position of a movably, in particular rotatory or translatory, mounted component, since a loss of counter readings of the incremental counters assigned to the motion sensors is effectively avoided and furthermore counter readings that may contain errors can be recognized and corrected.
- partially incremental motion sensors can also be used in safety-relevant systems without having to accept losses in safety and/or prediction accuracy.
- the movably mounted component can be a steering wheel, in particular a steering wheel mounted in a rotational manner, or at least part of an actuator for adjusting the steering angle of the front or rear wheels of a vehicle.
- the movably mounted component can also be a component connected, in particular rotatorily mounted, to a, in particular rotatorily mounted, steering wheel or steering system, with a rotational movement of the steering wheel or steering system being transmitted, preferably equally, to the movably mounted component.
- a vehicle can preferably be a car, a truck or an agricultural vehicle, in particular a tractor, a combine harvester or an excavator.
- the vehicle can preferably be an electric vehicle or a fully electric vehicle or a hybrid electric vehicle.
- a method according to the invention is carried out repeatedly, in particular cyclically, and/or continuously or quasi-continuously. It is also conceivable that at least two steps of a method according to the invention run or are carried out at least partially simultaneously. Furthermore, it can be provided that a method according to the invention is a computer-implemented method.
- a quasi-continuous implementation means a repeated implementation of a step at short time intervals.
- a quasi-continuous implementation can include an implementation frequency of at least 100 Hz, in particular at least 1 kHz, particularly preferably at least 100 or at least 200 kHz.
- At least two movement sensors of a detection system are arranged on a common component, in particular a printed circuit board, or are part of a common assembly, in particular a control unit. Provision can also be made for at least two movement sensors of a detection system to be arranged on different components, in particular different printed circuit boards, or to be part of different assemblies, in particular different control units. In particular, however, it is conceivable that all motion sensors of a detection system are used to monitor a movably mounted component, regardless of their arrangement on or in common or different components or assemblies.
- the detection system comprises at least one non-volatile data memory in order to be able to permanently file or store at least one motion sensor data set and/or at least one error data set.
- At least one non-volatile memory can be in the form of a flash memory.
- the use of a non-volatile data memory offers the advantage that the data is retained even if the power supply to the acquisition system is lost. A loss of Energy can be supplied unplanned, e.g. as part of a sudden voltage drop (brown-out), but also if the detection system is deliberately switched off. This can occur, for example, when the detection system is used in a vehicle and the vehicle is switched off.
- the stored data can be retrieved from the data memory after the power supply has been restored and used, for example, to initialize at least one motion sensor associated incremental counter.
- at least two, in particular several, non-volatile data memories are included. This results in the advantage that redundancy can be implemented in relation to the stored motion sensor data sets.
- a data memory is a main memory on which motion sensor data sets and/or error data sets are stored or filed and at least one data memory is a backup memory. Provision can also be made for the main memory to be backed up at least at fixed time intervals, with all data records stored in the main memory being copied to the backup memory.
- step d is additionally carried out, in particular for each motion sensor: - Retrieving the counter reading of the incremental counter and storing at least one motion sensor data set in a or the non-volatile data memory, the motion sensor data set comprising at least the current counter reading of the incremental counter and a motion sensor identifier of the respective motion sensor.
- step d the above method step relating to retrieving an incremental count and storing a motion sensor data set is hereinafter referred to as step d).
- at least one movement sensor data record is stored in at least one non-volatile memory of the detection system. This has the advantage that the movement sensor data set is permanently saved and is retained within the detection system even if the power supply is interrupted. Thus, when the power supply is restored, the measurement history of one or more motion sensors can be accessed and the current angle of rotation or the current position of a movably mounted component monitored by the motion sensor or sensors can be determined or further recorded.
- the motion sensor data set can include at least the current count of an incremental counter assigned or assignable to a motion sensor and/or a motion sensor identifier of the motion sensor and/or a time stamp.
- the use of a time stamp makes it possible to always identify the most recent motion sensor data set if several motion sensor data sets with an identical motion sensor identifier were stored on the non-volatile data memory and also allows a chronological traceability of the increments or decrements of an associated incremental counter made in relation to a motion sensor, which is a root cause analysis in the event of an identified error.
- a motion sensor data set For this purpose, on the basis of a new motion sensor data set to be stored, a It is checked whether there is already a motion sensor data set with the relevant or the same motion sensor identifier on the non-volatile data memory. If this is the case, the movement sensor data set in question can be deleted or overwritten on the non-volatile data memory and the new movement sensor data set can be saved or stored on the non-volatile data memory.
- the motion sensor identifier can be specific to the or a motion sensor. In other words, it can be provided that the counter reading of an incremental counter contained in the motion sensor data record can be unambiguously assigned to a, in particular specific, motion sensor via the motion sensor identifier. In this way, motion sensor data sets stored or saved in the data memory can always be assigned to the associated motion sensors and a continuous incrementing or decrementing of an incremental counter assigned to the motion sensor can be ensured, whereby a reliable and precise detection of the current angle of rotation or the current position of a device monitored by the motion sensor movably mounted component can be carried out.
- At least one motion sensor identifier can be in the form of a numeric, alphabetic or alphanumeric character string and can comprise at least 10, preferably at least 20, characters.
- At least two movement sensors, in particular all movement sensors, of the detection system are operated with different, in particular independent, energy sources or receive their energy supply from different, in particular independent, energy sources.
- the energy sources can energy sources of a vehicle. In particular a fully electric or hybrid electric vehicle.
- at least one energy source is one of the following energy sources:
- a high-voltage battery in particular of a fully electric or hybrid electric vehicle
- a backup capacitor in particular of a fully electric or hybrid electric vehicle
- a backup battery in particular in the form of a button cell, a lithium battery or a rechargeable battery, in particular lithium rechargeable batteries,
- a DC-DC converter in particular a fully electric or hybrid electric vehicle.
- the establishment or detection of an erroneous counter reading is carried out or can be carried out on the basis of a majority decision.
- a comparison of the counter readings first checks whether all counter readings are the same. If this is the case, it is assumed that there is no error in the recording system and/or no movement sensor or counter reading of an incremental counter is faulty. On the other hand, if at least one counter reading of an incremental counter deviates from the counter reading of at least one other incremental counter, it is assumed that the counter reading of at least one incremental counter is faulty.
- the incorrect counter reading can be identified on the basis of a majority decision, it being assumed that if a majority of the compared counter readings have the same value, this value is the correct value.
- a majority decision in particular when using more than three, in particular partially incremental, motion sensors in the detection system, that a, in particular random or quasi-random, classification is used to carry out the majority decision or to detect at least one incorrect meter reading of the movement sensors or the incremental counters assigned to the movement sensors takes place in at least two groups and, in particular, in relation to each of the groups, a majority decision is made the evaluation of the respective meter readings is carried out to detect at least one erroneous meter reading. Provision can be made for the, in particular random or quasi-random, division into groups to be carried out again each time step c) is carried out.
- the number of motion sensors or incremental counters can be adapted to the type of majority decision to be made. It can be provided that each movement sensor or incremental counter is assigned to at least one group. Provision can also be made for at least one movement sensor or incremental counter to be assigned to at least two groups.
- each group includes the same number of incremental counters or motion sensors.
- step c) at least one of the following steps is carried out, in particular if the detection system comprises more than three, preferably partially incremental, motion sensors:
- At least one meter reading identified as incorrect or containing errors is corrected by setting the meter reading identified as incorrect to the meter reading identified as correct by the majority decision or .is corrected.
- At least one error data record is stored or filed in at least one non-volatile data memory. This enables subsequent tracking of the error history within the acquisition system. It is also possible to carry out an evaluation of the error data records with regard to the frequency of the occurrence of an error in a specific movement sensor or in the associated incremental counter. In this way, it can be determined whether a detected error in a specific motion sensor has already been detected more frequently in the past, which indicates a systemic error and requires a corresponding check of the detection system or the motion sensor.
- the correction value can be the value to which at least one count of at least one incremental counter identified as faulty was corrected.
- the motion sensor identifier can be specific to that motion sensor's incremental counter has been corrected or is to be corrected. Provision can be made for an individual error data set to be created or stored on the non-volatile data memory for each error identified in relation to a motion sensor or the incremental counter assigned to the motion sensor and/or a correspondingly performed correction.
- at least one incremental counter is initialized and assigned for each motion sensor.
- the assignment can take place via a motion sensor identifier, as a result of which a clear connection can be established between the incremental counter and the motion sensor.
- the initialization can include setting the count of the incremental counter to an initial value.
- a motion sensor data set stored in the non-volatile data memory can preferably be accessed in order to be able to correctly detect and continue the increments or decrements made in the past in relation to the motion sensor when setting the initial value.
- the retrieval of the motion sensor data set can be done using a motion sensor identifier of the motion sensor, so that a motion sensor identifier or to the Motion sensor associated motion sensor data set can be identified. This ensures that the incremental counter is initialized with the correct value related to the associated motion sensor. If no motion sensor data set with the motion sensor identifier is contained or stored in the non-volatile data memory, the initial value can be set to zero. This may be necessary, for example, when starting or using the acquisition system for the first time.
- step d) it is also conceivable within the scope of the invention for step d) to be carried out at least at fixed time intervals and/or at least after step b) has been carried out and/or at least in the event of a loss of a supply voltage of at least one motion sensor and/or at least after completion of an initialization of at least one incremental counter is carried out.
- step d) of a method according to the invention is carried out at least at fixed time intervals.
- the time interval between two executions of step d) can be less than 1 minute, in particular less than 30 seconds, preferably less than 10 seconds, particularly preferably less than 1 second.
- the probability of data loss with regard to the count of one or more incremental counters can be reduced by performing step d) repeatedly over time.
- step d) can be carried out at least after each execution of step b).
- step d) can be carried out at least whenever at least one incremental counter assigned to a movement sensor has been incremented or decremented. This ensures that every change to an incremental counter is immediately stored in the non-volatile data memory. The loss of information relating to the counter reading of at least one incremental counter can be further reduced as a result.
- Step d) can also or alternatively be carried out at least in the event of a loss of a supply voltage and/or energy supply of at least one motion sensor. This results in the advantage that a loss of information in the event of a loss of a supply voltage or energy supply can be effectively avoided and safe and correct operation of the detection system can be resumed after the voltage supply or energy supply has been restored.
- the execution of step d) is preceded by a detection of an at least temporary loss of the supply voltage or energy supply (brownout).
- step is additionally carried out as part of a method according to the invention: - Monitoring, in particular continuous monitoring, of the supply voltage of at least one motion sensor, in particular all motion sensors, by at least one brown-out detector for detecting an at least temporary loss of the supply voltage of the motion sensor.
- the detection system comprises at least one brown-out detector or at least one brown-out detector is assigned or can be assigned to each motion sensor. Provision can also be made for at least one brown-out detector to monitor the supply voltage of at least two motion sensors.
- at least one movement sensor in particular all movement sensors, is monitored with at least one detector for detecting a drop or loss of the supply voltage or energy supply (brown-out detector), in particular continuously.
- the detection system can have at least one brown-out detector for monitoring the voltage supply or
- the detector can be designed at least partially as an electrical circuit (BOD circuit, brown-out detection circuit). Detection of a loss of the supply voltage can at least include detecting or detecting a drop in the supply voltage below a limit value.
- step d) can be carried out at least after completion of an initialization and/or assignment of at least one incremental counter. This ensures that a motion sensor record after the Initialization or assignment of an incremental counter in the non-volatile
- step b) is additionally carried out at least when the output signal exceeds and/or falls below at least one intermediate limit value, the intermediate limit value being smaller than the upper limit value and larger than the lower limit value.
- the incremental counter assigned to a motion sensor is incremented or decremented not only when the upper and/or lower limit of the measurement segment that can be detected by the motion sensor is undershot or exceeded, but also when at least one or always , if an intermediate limit value arranged or lying between the upper and lower limit value is exceeded and/or fallen below. It can be provided that several, in particular at least two or exactly two, intermediate limit values are provided.
- the measuring segment of the motion sensor or the area between the upper and lower limit value is divided into segments of equal size by at least one intermediate limit value or the upper limit value, the lower limit value and at least one intermediate limit value are equidistantly spaced.
- Such a counting method can create the prerequisite for a more precise evaluation of the movement sensor or of the count of the incremental counter assigned to the movement sensor.
- a first count in connection with an output signal of the Motion sensor which is equal to or virtually equal to the upper limit value and compared to the first counter reading increased by one second counter reading in conjunction with an output signal of the motion sensor, which is equal to or virtually equal to the lower limit value are identified as equivalent counter readings.
- Such an identification can be realized by the counting method described above.
- a first and a second intermediate limit value are provided, with the first intermediate limit value preferably being smaller than the second intermediate limit value and in particular the first and the second intermediate limit value being greater than the lower limit value and smaller than the upper limit value.
- step c) preferably before the counter readings are compared, at least one arithmetic operation is applied to at least one counter reading of an incremental counter, in particular to all counter readings, and a corrected value of the counter reading of the incremental counter is thereby determined . Furthermore, it can be provided that for the subsequent comparison of the counter readings it is not the retrieved counter reading that is used, but rather the result of the arithmetic operation or arithmetic operations applied to the counter reading or the corrected counter reading. In other words, provision can be made for the counter reading of at least one incremental counter to be corrected in step c), preferably before the counter readings are compared. It can preferably be provided that at least the following arithmetic operations are carried out to correct the counter reading:
- the counter reading is first increased by one and then a division is carried out, with the increased by one as the dividend Counter reading and the number of intermediate limit values increased by one is used as the divisor. If the number of intermediate limit values is two, for example, then the divisor has a value of three. For example, if the count is three, the dividend is 4. The result of the division without remainder or the corrected count would be one in this example.
- the result is a value that is suitable for comparing two incremental counters, which solves the problem described above that a first counter reading in connection with an output signal of the motion sensor, which is equal or almost equal to the upper limit value, and a second counter reading that is increased by one compared to the first counter reading Counter reading in conjunction with an output signal of the motion sensor, which is equal or virtually equal to the lower limit value takes into account. In this way, incorrect identification of erroneous meter readings or erroneous detection of error states can be effectively avoided.
- step a the following step is carried out:
- the adjustment takes place on the basis of a spatial offset, in particular a known one, of the movement sensors in the detection system. This allows a more efficient evaluation of the output signals to be implemented.
- At least one incremental counter is designed in terms of software or is implemented as software. Also or alternatively, at least one incremental counter can be physically formed.
- the output signal of at least one movement sensor is a preferably variable electrical voltage or current intensity, with the output signal preferably being proportional to the measured value (angle of rotation or distance) currently detected by the motion sensor is in the measuring segment that can be detected by the motion sensor.
- the detection system is a detection system according to the invention and/or is designed according to one of claims 8 to 12.
- a detection system comprising at least three, in particular partially incremental, motion sensors for redundant detection of the, in particular current, angle of rotation and/or the, in particular current, position of a movably, in particular rotationally or translationally, mounted component and at least one non-volatile Data memory, wherein the acquisition system is operated or can be operated according to a method according to the invention, in particular according to a method according to one of claims 1 to 7.
- the detection system the same advantages result as have already been described with regard to the method according to the invention.
- At least two movement sensors, in particular all movement sensors, of the detection system can be operated by different or independent energy sources.
- At least one energy source can preferably be one of the following energy sources:
- a backup battery in particular in the form of a button cell, a lithium battery or a rechargeable battery, in particular lithium rechargeable batteries,
- a high-voltage battery in particular of a fully electric or hybrid electric vehicle
- a backup capacitor in particular of a fully electric or hybrid electric vehicle
- - A supercapacitor in particular of an all-electric or hybrid-electric vehicle
- a DC-DC converter in particular a fully electric or hybrid electric vehicle.
- At least two motion sensors can have a spatial offset, in particular so that mutual influencing of the output signals of the motion sensors is reduced or ruled out.
- a phase shift in the output signals of the motion sensors caused by the spatial offset is recalculated before the output signals are evaluated, in particular in order to adjust the phase position of the output signals.
- At least one motion sensor is designed as a resistive motion sensor and/or as an inductive motion sensor and/or as a capacitive motion sensor and/or as a magnetic motion sensor.
- a detection system comprises at least one means or means for executing a method according to the invention, in particular at least one microcontroller and/or at least one processor.
- the detection system comprises more than three movement sensors, in particular at least four, at least five or at least six movement sensors.
- the detection system can include at least one wake-up sensor. Provision can also be made for the energy supply of the detection system to be controllable in such a way that an energy supply to the wake-up sensor is maintained while the energy supply of at least one motion sensor is at least temporarily interrupted. Furthermore, it can be provided that a movement of the movably mounted component can be detected by the wake-up sensor. If a movement of the movably mounted component was detected, at least one motion sensor, in particular all motion sensors, can be or can be supplied with energy in order to enable continuous detection of the current angle of rotation or the current position of the movably mounted component. This results in the advantage that the energy consumption of the detection system can be reduced, at least temporarily, without endangering continuous detection of the current position or the current angle of rotation of the movably mounted component.
- the detection system comprises at least one control unit. It can be provided that the control unit is or can be brought into an operative connection with at least one motion sensor in such a way that a power supply to the motion sensor can be interrupted or restored at least temporarily. It can also be provided that the control unit is or can be operatively connected to at least one wake-up sensor of the detection system in such a way that, depending on one of the wake-up Up sensor received signal (wake-up signal) a power supply of at least one motion sensor can be produced.
- the control unit is or can be brought into an operative connection with at least one motion sensor in such a way that a power supply to the motion sensor can be interrupted or restored at least temporarily. It can also be provided that the control unit is or can be operatively connected to at least one wake-up sensor of the detection system in such a way that, depending on one of the wake-up Up sensor received signal (wake-up signal) a power supply of at least one motion sensor can be produced.
- a vehicle comprising at least one detection system according to the invention or at least one detection system according to one of claims 8 to 12.
- vehicle comprising at least one detection system according to the invention or at least one detection system according to one of claims 8 to 12.
- a computer program product comprising instructions which cause a detection system according to the invention or a detection system according to any one of claims 8 to 10 to execute a method according to the invention or a method according to any one of claims 1 to 7.
- the same advantages result as have already been described in relation to a detection system according to the invention and a method according to the invention.
- Fig. 3 is a schematic view of an output signal of a
- Fig. 4 is a schematic view of an output signal of a
- FIG. 5 shows a schematic view of a vehicle according to the invention.
- the detection system 10 comprises at least three partially incremental motion sensors 12, the motion sensors 12 being designed as rotation angle sensors for redundantly detecting the rotation angle A of a movably mounted component 11.
- the movably mounted component 11 is mounted at least rotationally, with the component 11 being able to rotate about the axis of rotation R.
- the rotationally mounted component 11 is mounted in such a way that from a reference position (zero position) a rotation both clockwise and counterclockwise about the axis of rotation R can be carried out.
- the permissible range of movement (angle of rotation range) of the movably mounted component 11 extends over more than one complete rotation of the rotatably mounted component 11 about the axis of rotation R and is therefore more than 360° (angular degrees).
- the motion sensors 12 are designed as partially incremental rotation angle sensors and enable continuous or quasi-continuous detection of the rotation angle A of the movably mounted component 11 via a measuring segment T that can be detected by the motion sensors 12. At least when the rotation angle A of the movably mounted component monitored by the partially incremental motion sensor 12 Component 11 is the upper or lower limit of the measuring segment T exceeds or falls below, an incremental counter 16 assigned to the movement sensor 12 is incremented or decremented and the measuring segment T of the movement sensor 12 is passed through again accordingly with a progressive rotation of the movably mounted component 11 .
- the incremental counter 16 is incremented or decremented depending on whether the measurement segment that can be detected by the movement sensor 12 falls below or reaches the lower limit value U and whether it exceeds or reaches the upper limit value O. When the upper limit value O is reached or exceeded, the incremental counter is incremented and when it is reached or
- the detection system 10 comprises at least one non-volatile data memory 13 in order to be able to permanently file or store at least one rotational angle sensor data set and/or at least one error data set.
- the use of a non-volatile data memory offers the advantage that the data is retained even if the power supply to the acquisition system is lost.
- the detection system 10 comprises at least three brown-out detectors 17, with each rotation angle sensor 12 being assigned at least one brown-out detector 17, so that a supply voltage of the corresponding rotation angle sensor 12 can be monitored via one of the brown-out detectors 17 or a loss of the supply voltage of the corresponding rotation angle sensor 12 can be detected.
- the motion sensors 12 are operated with different energy sources 18 that are independent of one another, as a result of which the reliability of the detection system 10 can be increased.
- 1 shows the detection system 10 purely schematically.
- at least two movement sensors 12 can be arranged on a common printed circuit board (not shown).
- at least one brown-out detector 17 can be designed at least partially as an electrical circuit, in particular as a brown-out detection circuit.
- Fig. 2 also shows a schematic view of a method 100 according to the invention for operating at least one detection system 10 for detecting a, in particular current, angle of rotation A and/or a, in particular current, position of a movably mounted component 11, the detection system 10 comprising at least three, in particular , partially incremental motion sensors 12 for independent and/or redundant monitoring of the movably mounted component 11 and at least one non-volatile data memory 13, with at least the following steps being carried out for each motion sensor 12: a) evaluating 101 an output signal 14 of the respective motion sensor and detecting at least one Falling below or reaching a lower limit value U and exceeding or reaching an upper limit value O by the output signal 14, with the lower limit value U and the upper limit value O delimiting a measurement segment T that can be detected by the motion sensor 12, b) incrementing or decrementing 102 a incremental counter 16 assigned to the respective motion sensor 12 at least when the output signal 14 detects that the lower limit value U has been undershot or reached or that the upper limit value O has been exceeded or reached,
- the following step is also carried out for each movement sensor 12: - retrieving 103 the count of the incremental counter 16 and storing at least one motion sensor data set in the non-volatile memory 13, the motion sensor data set comprising at least the current value of the incremental counter 16 and a motion sensor identifier of the respective motion sensor 12,
- FIG. 3 shows a schematic view of an output signal 14 of a motion sensor 12, the motion sensor 12 being designed as a rotation angle sensor.
- the output signal 14 generated by the movement sensor 12 is shown over the entire permissible movement range B of a rotationally mounted component 11, with a movement or rotation of the component 11 beyond the limits of the movement range B not being able to be carried out.
- the component 11 can be rotated one complete rotation of 360° (angular degrees) clockwise and one complete rotation of 360° (angular degrees) counterclockwise, so that the range of motion covers a total of two complete revolutions (720° ) includes.
- each sawtooth represents the complete or one-off stepping through or passing through the measurement segment T that can be detected by the motion sensor 12.
- the measuring range of the measuring segment T is 120° (angular degrees), so that a complete revolution of the movable component 11 is shown in the output signal by a total of three saw teeth.
- the saw teeth are lined up in accordance with a progressive rotation of the component 11 .
- the amplitude or the value of the output signal 14 is plotted against the movement detected by the movement sensor 12 (in this case a rotation of the component 11).
- Each sawtooth 15 of the output signal 14 has a first edge 15.1 with a finite gradient and a second edge 15.2 with an infinite gradient, the gradient representing the change in the output signal 14 in relation to the change in the angle of rotation A detected by the motion sensor 12.
- the first edge 15.1 indicates a continuous rise or fall in the output signal 14 of the movement sensor 12 while passing through the measuring segment T that can be detected by the movement sensor 12 or during a progressive rotation of the component 11 in the measuring segment T.
- the value of the output signal 14 is proportional to the measured value or angle of rotation or path currently recorded in the measuring segment T of the movement sensor 12 .
- the second flank 15.2 marks the transition from a (e.g. first) passage through the measurement segment T that can be detected by the motion sensor 12 to a renewed (e.g. second) passage through the measurement segment T that can be detected by the motion sensor 12 and thus a necessary incrementing of the one assigned to the motion sensor 12 incremental counter 16.
- the output signal 14 shown in Fig. 3 can be evaluated, whereby a detection takes place as to whether the output signal reaches or exceeds the upper limit value O and/or reaches or falls below the lower limit value U, since in both cases the measuring segment T of the motion sensor 12 would be passed through again and thus an incrementing of an incremental counter 16 assigned to the movement sensor 12 is necessary in order to continuously detect the correct position or the correct angle of rotation A of the movably mounted component 11 .
- the upper limit value O and the lower limit value U delimit the measurement segment T that can be detected by the movement sensor 12, so that the value of the output signal 14 of the movement sensor 12 can only ever vary between the upper limit value O and the lower limit value U.
- the dem Motion sensor 12 associated incremental counter 16 incremented.
- the incremental counter 16 can be incremented in correspondingly opposite directions depending on the determined direction of movement (for example a clockwise or counterclockwise rotation) of the component 11 .
- the current angle of rotation A of a movably mounted component 11 monitored by the motion sensor 12 can be determined by the partially incremental motion sensor 12 by multiplying the counter reading of the incremental counter 16 assigned to the motion sensor 12 by the measuring range covered by the measuring segment T of the motion sensor (here 120°) and a subsequent addition with the value that can be read or determined from the output signal 14 of the motion sensor 12 within the measurement segment T that can be detected by the motion sensor 12 can be determined.
- FIG. 4 shows a schematic view of an output signal 14 of a motion sensor 12, the output signal 14 corresponding to that from FIG.
- FIG. 4 shows two intermediate limit values Z.
- the first intermediate limit value Z1 is smaller than the second intermediate limit value Z2.
- the first intermediate limit value Z1 and the second intermediate limit value Z2 are greater than the lower limit value U and smaller than the upper limit value O.
- the first intermediate limit value Z1 and the second intermediate limit value Z2 divide the value range between the upper limit value O and the lower limit value U into equidistant intervals .
- the motion sensor when the output signal reaches or exceeds the upper limit value O or reaches or falls below the lower limit value U, the motion sensor is also incremented in relation to FIG 12 associated incremental counter 16 when one of the intermediate values Z is exceeded or fallen below or reached.
- the incremental counter 16 is also incremented in correspondingly opposite directions.
- Fig. 5 also shows a vehicle 200 according to the invention comprising at least one detection system 10 according to the invention.
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Abstract
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Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102021125758 | 2021-10-05 | ||
| PCT/EP2022/075113 WO2023057168A1 (de) | 2021-10-05 | 2022-09-09 | Verfahren zum betrieb eines erfassungssystems und erfassungssystem |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4413329A1 true EP4413329A1 (de) | 2024-08-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22783445.4A Pending EP4413329A1 (de) | 2021-10-05 | 2022-09-09 | Verfahren zum betrieb eines erfassungssystems und erfassungssystem |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20240255272A1 (de) |
| EP (1) | EP4413329A1 (de) |
| CN (1) | CN118056112A (de) |
| WO (1) | WO2023057168A1 (de) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3920113B2 (ja) * | 2002-03-05 | 2007-05-30 | アルプス電気株式会社 | 回転角検出装置 |
| JP3891288B2 (ja) * | 2003-03-28 | 2007-03-14 | 株式会社ジェイテクト | 電気式動力舵取装置 |
| DE102007049787A1 (de) * | 2007-10-17 | 2009-04-23 | Continental Automotive Gmbh | Lenksystem |
| JP6341350B2 (ja) * | 2016-05-13 | 2018-06-13 | 日本精工株式会社 | モータ駆動制御装置、電動パワーステアリング装置及び車両 |
| JP7180370B2 (ja) * | 2018-12-26 | 2022-11-30 | 株式会社デンソー | モータ制御装置およびこれを備えるモータ制御システム |
| JP7172797B2 (ja) * | 2019-03-28 | 2022-11-16 | 株式会社デンソー | 検出ユニット |
-
2022
- 2022-09-09 EP EP22783445.4A patent/EP4413329A1/de active Pending
- 2022-09-09 WO PCT/EP2022/075113 patent/WO2023057168A1/de not_active Ceased
- 2022-09-09 CN CN202280067163.4A patent/CN118056112A/zh active Pending
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2024
- 2024-04-05 US US18/628,484 patent/US20240255272A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| US20240255272A1 (en) | 2024-08-01 |
| WO2023057168A1 (de) | 2023-04-13 |
| CN118056112A (zh) | 2024-05-17 |
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