• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a method for communicating a malfunction of a system for measuring the speed and direction of rotation of a rotary shaft, said system comprising: a gear wheel associated with said rotary shaft, called a target (14 ), • a magnetic field sensor (10 '), measuring values (K, A) of the magnetic field (B, B', B ") generated by the passage of the teeth (T1, T2..Ti) in front of said sensor (10 ') and delivering a signal (S, S', S ") to processing means (13) According to the invention, the method comprises the following steps: • Step 1: Comparison by the sensor between the measured values and predetermined threshold values of the magnetic field, • Step 2: If the measured values are lower than the predetermined threshold values, • Step 3: Generation by the sensor of a coding on the signal, representative of the measured values, to communicate to the means of treatment a malfunction of the system.
    公开号:FR3027388A1
    申请号:FR1459923
    申请日:2014-10-16
    公开日:2016-04-22
    发明作者:David Mirassou；Alain Gonzalez；Benjamin Marconato
    申请人:Continental Automotive GmbH；Continental Automotive France SAS；
    IPC主号:
    专利说明:

    [0001] The invention relates to a method for communicating a malfunction of a system for measuring the speed and direction of rotation of a rotary shaft. The invention applies more particularly to a system for measuring the speed and direction of rotation of a crankshaft of a motor vehicle.
    [0002] By measuring system is meant a system comprising a gear wheel, called target, associated with the crankshaft, and a crankshaft sensor whose operation is explained below. The crankshaft sensors are used in a motor vehicle to determine the position of the crankshaft, the speed of rotation and the direction of rotation of the engine. Used in combination with camshaft sensors, they determine the position of the different cylinders in the combustion cycle of the engine (ie determine for each cylinder if it is in phase of admission, in phase compression, in the explosion phase or in the exhaust phase) and make it possible to better manage the operation of the engine, by optimally adjusting the ignition advance or the fuel injection time. These crankshaft sensors comprise a magnetic field generator (example: a permanent magnet), a magnetic field detection means (Hall effect cell, magneto-resistive cell MR, giant magnetoresistive cell GMR, ... for example) and a electronic circuit for processing the signal received by the magnetic field detection means. These sensors, called active sensors, deliver a digital signal to processing means. The magnetic field generator may also be a target, composed of a magnetic material, having alternating South and North poles. In this case, the sensor incorporates or no permanent magnet according to the detection means used. Subsequently, we will assimilate the South and North poles to the teeth and troughs of a mechanical target. In known manner and as illustrated in Figure 1, a crankshaft sensor 10 is associated with a target 14 secured to a crankshaft 16. This target 14 is in the form of a disk 15 whose periphery is toothed. Between each tooth T1, 12, 13 substantially identical, is a spacing (hollow) C1, C2, C3. The target 14 is distinguished by the presence of a hollow Ce longer, more commonly called "missing tooth" (or "missing tooth" in English) positioned precisely at a certain angle relative to the angular position of the engine. According to the embodiment described and shown in FIG. 1, a crankshaft sensor 10 comprises, in a known manner, a ferromagnetic element 11 and a magnetic field detection means 12 (for example a Hall effect cell). This sensor 10 delivers a digital signal to one of the processing means 13. The operation of such a sensor assembly 10 and the associated target 14 is described below.
    [0003] When the target 14 is rotated in one direction (arrow Av Figure 1) by the crankshaft 16, the sensor 10 perceives a series of variations of the magnetic field representative of the tooth or teeth Tl, 12, 13 passing in front of him and their spacing 01, 02, 03, Ce (see Figure 2). The signal thus obtained is represented in FIG. 3. In FIG. 3 is represented according to the prior art, the signal B of the magnetic field delivered by the sensor 10 as a function of the angle of rotation 0 of the crankshaft 16 (or the target 14), as well as the threshold S1 for detecting the rising edge and the falling edge of the first tooth Tl. FIG. 2 represents the position of the teeth 11, 125 ... T, and recesses C1, 02 ... C of the target 14 with respect to the signal B of the magnetic field of FIG.
    [0004] As illustrated in FIG. 3, in order to determine the position of the crankshaft, the signal B represents the variations of the magnetic field perceived by the crankshaft sensor 16 during a turn of the target 14, that is to say according to a 0 rotation angle of the target 14. This signal has a sequence of sinusoids D1, D2 .. .Di each corresponding to the variation of the magnetic field measured by the sensor 10 when a tooth 11, 12 .. .I (cf. Figure 3) followed by a hollow Cl, 02 ... C, passes in front of the said sensor 10. By counting the number of sinusoids D1, D2 ... D ,, by measuring the duration of each of them, the spacing between each sinusoid D1 D2 ... D ,, and by detecting the missing tooth (the spacing due to missing tooth This being longer), it is possible to determine the rotational speed of the motor, the direction of rotation of the motor and the angular position of the crankshaft. As illustrated in FIG. 3, the signal B has a minimum BMIN1 and a maximum BMAX1 - the detection of the passage of the teeth 11, 12 ... 1, and the recesses C1, C2 ... C, of the target 14 is made by detecting the passage of the signal B above (respectively below) a detection threshold S1 placed between the minimum BMIN1 and the maximum B MAXI I 30 for example equal to S1 = k1 * MAXI BMIN1) I k1 being a constant for example equal to 0.50. For explanatory purposes, the signal B illustrated in FIG. 3 comprises a single minimum Bm and a single maximum B IN1 MAXI - In reality, the signal B has a plurality of minimums BmiNi and a plurality of maximums BmAxi and the detection threshold Si continuously adapts according to the minimums and the maximums so as to be always equal to = k1 * (BmAxi BmiNi) - This method of adaptation of the detection threshold Si is known to those skilled in the art, see the application for Patent FR 2 985 035 A1 filed by the applicant which describes the same method of adaptation of the detection threshold but applied to a camshaft sensor. The magnetic field variations perceived by the sensor 10 (signal B in FIG. 3) are processed by the sensor 10, and the latter sends to the processing means 13 a signal S of voltage 0-5 V (see FIG. pulses I from a high state (5 V) to a low state (0 V), each pulse I is representative of the passage of the middle of a tooth 11, T2 ... Ti in front of the sensor 10, that is, that is, crossing the detection threshold S1 from the maximum value BMAX1 of the signal B to the minimum value BMIN1- When the target 14 turns "forward" (see arrow Av), the pulse I has a first duration predetermined t1, for example 45 ps. When the target 14 rotates in "reverse" (arrow AR), the pulse I has a second predetermined duration t2, for example 90 ps. The detection of the direction of rotation of the target 14 "forward" or "reverse" is known to those skilled in the art, and will not be described in detail here. Indeed, the sensor 10 generates a second signal, called a direction signal (not shown), whose phase shift with the signal S indicates the direction of rotation of the target 14. The processing means 13, receives the signal S and the direction signal and then determines the speed of rotation, the direction of rotation of the crankshaft, that is to say the engine. In the event of an electrical malfunction of the sensor 10, ie a short circuit to ground, or an open circuit, the signal S at the output of the sensor 10 takes either the value 0 V or the value 5 V ( respectively). However, such a sensor 10 does not provide information to the processing means 13 concerning a possible malfunction of the system 20 for measuring the speed and direction of rotation of the crankshaft. The term "system malfunction" is understood to mean: an air gap defect (also referred to as a gap gap error) or alignment between the sensor 10 and the target 14 or misaligned with it, the sensor 10 is in this case too far from the target 14, and the variations of the magnetic field 30 perceived by the sensor 10 are too small to accurately determine the speed and direction of rotation of the crankshaft, - a "run-out" or lack of eccentricity of the target 14, the target is then fixed on the crankshaft so that when it rotates, it oscillates in its plane, or it is not centered on the axis of the crankshaft, in these two cases, the variations of the field Magnetic on a turn of target 14 are important and impact the accuracy of the signal S. As for the previous faults, the determination of the speed and direction of rotation of the crankshaft may be impossible. The object of the invention is to remedy these problems. The invention proposes a method of communicating a malfunction of the system for measuring the speed and the direction of rotation of a crankshaft with inexpensive processing means making it possible to signal to the processing means 13 a defect in the air gap or a misalignment between the sensor 10 and the target 14, as well as an eccentricity defect or a "false round" of the target 14. The invention proposes a method of communicating a malfunction of a system for measuring the speed and direction of rotation of a rotary shaft to processing means, said system comprising: - a gear wheel associated with said rotary shaft, called a target, - a magnetic field sensor, measuring values of the magnetic field generated by the passage of the teeth in front of said sensor and delivering a signal to the processing means, said signal comprising pulses between a high state and a low state, each pulse being representative of the passage of a tooth in front of the sensor, and each pulse having two predetermined duration, a first duration representative of a first direction of rotation of the target, and a second duration representative of the opposite direction of rotation of the target. According to the invention, the detection method comprises the following steps: - Step 1: Comparison by the sensor between the measured values of the magnetic field and the predetermined threshold values of the magnetic field, - Step 2: If the measured values of the magnetic field are below the predetermined threshold values of the magnetic field, then - Step 3: Generation by the sensor, in a direction of rotation, of a signal coding, representative of the measured values of the magnetic field, using at least a third duration of pulse and at least a fourth pulse duration in order to communicate to the processing means a malfunction of the speed measuring system and direction of rotation of the rotary shaft. Thus, the invention resides in the use of additional pulse durations on the output signal of the sensor in order to perform coding for the processing means. This coding represents the abnormal measured values (because below the predetermined threshold values, representative of normal operation of the system) of the magnetic field. The processing means then decode the received signal and deduce the abnormal measured values of the magnetic field. The method of malfunction communication according to the invention therefore allows the processing means to diagnose several malfunctions of the speed measuring system and direction of rotation of a rotary shaft by specific coding performed by the sensor. In a preferred embodiment of the invention, the coding is binary (0.1), the third predetermined duration having the value "0", and the fourth predetermined duration having the value "1". One of the measured values of the magnetic field may be the magnitude of the magnetic field for at least one turn of rotation of the target or may be the ratio of the minimum amplitude of the magnetic field to the maximum amplitude of the magnetic field during at least one turn of rotation of the target. Conveniently, the third predetermined duration and the fourth predetermined time are calculated as a function of the time between the passage of two consecutive teeth at a maximum rotational speed of the crankshaft. The invention also relates to a magnetic field sensor of a system for measuring the speed and direction of rotation of a rotary shaft, measuring values of the magnetic field generated by the passage of the teeth of a toothed wheel, referred to as a target. associated with said rotary shaft, in front of said sensor and delivering a signal to processing means, said signal comprising pulses between a high state and a low state, each pulse being representative of the passage of a tooth in front of the sensor, and each pulse having two predetermined duration, a first duration representative of a first direction of rotation of the rotary shaft, and a second duration representative of the opposite direction of rotation of the rotary shaft, according to the invention the sensor comprises: - means for storing predetermined threshold values of the magnetic field; means for comparing the measured values of the magnetic field with the predetermined threshold values of the magnetic field; magnetic field, means for generating at least a third predetermined pulse duration and at least a fourth predetermined pulse duration, for carrying out a binary coding of the signal representative of the measured values of the magnetic field, processing means. The invention applies to any motor vehicle comprising a magnetic field sensor according to the characteristics listed above. Other characteristics and advantages of the invention will appear on reading the following description and on examining the appended drawings in which: FIG. 1, explained above, is a diagrammatic sectional view showing a sensor 10 of the crankshaft 16 and its associated target 14, FIG. 2, explained above, represents the position of the teeth T1, 12 ... and cavities C1, 02 ... C, of the target 14, FIG. previously, represents according to the prior art, the signal B delivered by the sensor 10 as a function of the rotation angle 0 of the crankshaft 16 (or of the target 14), as well as the detection threshold S1 of the ascending and descending edges, relative to the passage of teeth T1, 12 ... T, and recesses C1, 02 ... C, of the target 14 of FIG. 2 in front of the sensor 10, FIG. 4 explained above, represents the signal S delivered by the sensor 10 to the processing means 13, FIG. p magnetic B 'perceived by the sensor 10 according to the rotation angle 0 of the crankshaft 16, during a malfunction of the system, due to a gap gap between the sensor 10 and the target 14, Figure 6 represents, according to the invention, the binary coding of the malfunction illustrated in FIG. 5, carried out by the sensor 10 on the signal S 'intended for the processing means, FIG. 7 represents the variations of the magnetic field B "perceived by the sensor 10 according to FIG. angle of rotation of the target, during a malfunction of the system, due to a "false round" of the target (or crankshaft), Figure 8 represents, according to the invention, the binary coding of the malfunction illustrated in FIG. FIG. 7, made by the sensor 10 on the signal S 'intended for the processing means, FIG. 9 represents the magnetic field sensor 10' according to the invention. In FIG. 1 is illustrated a system 20 for measuring the speed and direction of rotation of a crankshaft, comprising: a gear wheel associated with the crankshaft (not shown), referred to as target 14, a magnetic field sensor or sensor crankshaft measuring values of the magnetic field, for example the intensity of the magnetic field, generated by the passage of teeth Cl, 02 ... C, of the target 14 in front of said sensor 10. The sensor 10 delivers a signal S 0-5V at processing means 13, said signal comprises pulses I between a high state (5 V) and a low state, for example from a high state to a low state (0 V) (see FIG. 4). Each pulse I is representative of the passage of a tooth T1, 12 .. .I (more precisely of the passage of half a tooth) in front of the sensor 10, and each pulse I has two predetermined durations, a first predetermined duration t1 , representative of a first direction of rotation of the target 14, for example the forward movement Av and a second predetermined duration t2, representative of the opposite direction of rotation of the target 14, that is to say the reverse gear AR.
    [0005] The signal S is received by the processing means 13 which deduces the speed and direction of rotation of the crankshaft. This is known to those skilled in the art and has been described previously. The invention will be described below, taking, as an example of the malfunction of the system 20, firstly, a malfunction of type 10 air gap defect, then in a second time a malfunction type "false round" of the target 14 (ie: crankshaft). In the case of an air gap defect, the sensor 10 is abnormally far from the target 14. This can occur during the mounting of the sensor 10. Due to the distance of the sensor 10 vis-à-vis the target 14, that perceives from the target 14, a magnetic field B 'weakens, low intensity. This is represented in FIG. 5. The measured amplitude value A by the sensor 10, that is to say the difference between the maximum value of the magnetic field BMAX2 and the minimum value of the magnetic field BmIN2, is A = ( BmAx2-BBmiN2) is greatly reduced with respect to the amplitude value of the magnetic field B of the prior art Aref. (BmAxi - Bm 1 is: 20 5 son .: 20 (BmAx2-BBMIN2) <(13MAX1-BMIN1) The value of the detection threshold S2 in the presence of this gap defect is much smaller than that of the detection threshold (Si) for a normal air gap, which makes the detection of teeth Tl, 12 .. .Ti of the target The invention proposes that the sensor 10 'compares the measured value A of the magnetic field B', in this example, the amplitude of the magnetic field A = BMAX2 - BMIN2 and compares it with a threshold value d. predetermined amplitude representative of the absence of gap defect, this amplitude threshold value corresponds to the amplitude minimum of the magnetic field, for example here Aret = BMAX1 - BMIN1, obtained with a maximum gap distance. For this purpose, the sensor 10 'according to the invention comprises in the form of software storage means 30 (see FIG. 9) predetermined threshold values of the magnetic field B (in this case the Aret amplitude threshold value) as well as means for comparison 31 (see FIG. 9), between the measured values (here the amplitude A) of the magnetic field B 'and the predetermined threshold values Aret. of the magnetic field B. If the measured value, here the amplitude A of the magnetic field B 'is less than the predetermined amplitude threshold value Aret, the sensor 10' informs the processing means 13 by performing on the line of output of the signal S ', a coding representative of the measured value, that is to say of the measured amplitude A of the magnetic field B'. For this purpose, the sensor 10 'generates on the signal S pulses I of predetermined durations, using a third predetermined duration t3, for example equal to 135 ps and a fourth predetermined duration t4, for example equal to 1701.1s, different of the first predetermined duration t1 = 45 ps meaning the direction of rotation "forward" Av of the target 14, and different from the second predetermined duration t2 = 901.1s, meaning the direction of rotation "reverse" AR of the target 14 The generation of these third duration t3 and the fourth predetermined duration t4 are carried out by generation means 32 (see FIG. 9) of software type integrated in the sensor 10. In the example below, which is in no way limiting, the coding realized is a binary coding using a succession of pulses I of third t3 and fourth predetermined duration t4. This is illustrated in FIG. 6. Once the sensor 10 'has detected that the amplitude A of the measured magnetic field B' is less than the predetermined threshold value Aret of the magnetic field B for a normal air gap, generates on its signal output line S a binary code representative of the measured amplitude A of the magnetic field, by assigning the value "0" for example to the third predetermined duration t3, and a value "1" to the fourth duration predetermined t4. In FIG. 6, the binary code carried out is on 8 bits, and consists of "0 1 0 1 1 1 00". This code is received by the processing means 13, which extracts the value of the measured amplitude A and sends a central unit a gap fault message between the sensor 10 and the target 14. In FIG. are illustrated the variations of the magnetic field B "perceived by the sensor 10 in the case of a malfunction of the system, of the" false round "type, in which case the amplitude of the magnetic field B" is not constant; varies between a maximum amplitude AmAx = BMAX4-13MIN4 and a minimum amplitude AmiN = BMAX3-13MIN3. In this case, the sensor 10 'compares the ratio between the minimum amplitude and the maximum amplitude of the measured magnetic field B ", ie K = = (BMAX3 r BMIN3), AmAx ^ BMAX4-BMIN4) with a threshold value The predetermined ratio threshold value Kref represents the minimum ratio between the minimum amplitude and the maximum amplitude of the magnetic field B, obtained without the malfunction of the run-off type system. FIG. 8, K <Kref, for example Kref is equal to 0.7.
    [0006] The binary coding carried out on the signal S "representative of the value of the amplitude ratio K and illustrated in FIG. 8, is for example equal to" 1 1 1 1 0 0 0 0 0. This binary code is received by the means 13, which outputs the value of the amplitude ratio K and sends a "run-off" error message to a central unit Of course, the sensor 10 'can use a plurality of predetermined duration, depending on the complexity the code and therefore the message to be transmitted to the processing means 13. It is important to note that the binary coding can only be performed in one direction of rotation of the target 14, for example the forward movement A. In effect, by generating the fault binary code, that is to say by replacing the predetermined duration of pulse representative of the direction of rotation of the target 14 (either the first predetermined duration t1, or the second predetermined duration t2), by the third and fourth time The predetermined means t3, t4, representative of the defect, the processing means 13 no longer receive information concerning the direction of rotation of the target 14. This is solved by the invention, by performing binary coding only in a sense of given rotation, for example forward A. When the direction of rotation of the target 14 changes, and goes from forward to reverse AR, the coding is interrupted. Detection of the direction of rotation of the target 14 is known to those skilled in the art and has been previously described. In addition, the value of the third predetermined duration t3 and the fourth predetermined duration t4 must be calculated in order to be less than the duration between two successive teeth at the maximum rotational speed (for example 4000 rpm or 6000 rpm). min) of the target 14, in order to be able to report any system fault at this maximum speed. According to the invention, the method of communicating a malfunction of a system for measuring the speed and direction of rotation of a rotary shaft, in our example, a crankshaft; to processing means, therefore comprises the following steps: Step 1: Comparison by the sensor 10 'between the measured values of the magnetic field and the predetermined threshold values of the magnetic field, Step 2: If the measured values of the magnetic field are below the predetermined threshold values of the magnetic field, then - Step 3: Generation by the sensor 10 ', in a direction of rotation of the target 14, 35 of a coding of the signal S', S ", representative of the measured values of the magnetic field, using at least a third pulse duration t3 and at least a fourth pulse duration t4 in order to communicate to the processing means 13 a malfunction of the system for measuring the speed and direction of rotation of the rotary shaft In order to implement the communication method according to the invention, the sensor 10 'comprises: storage means 30 for predetermined threshold values Aret, Kref of the magnetic field; comparison 31 between the measured values A, K of the magnetic field and the predetermined threshold values Aret, Kref of the magnetic field, - generation means 32 of at least a third predetermined duration t3 pulse and at least a fourth predetermined duration t4 of pulse, to perform a binary coding of the signal S ', S ", representative of the measured values A, K of the magnetic field to the processing means 13. Of course, the measured values of the magnetic field may be different amplitude or amplitude ratio (between the minimum amplitude and the maximum amplitude) of the magnetic field. According to the measured values and the predetermined threshold values of the magnetic field, step 3 can be performed when the measured values are greater than the predetermined threshold values. This is the case, for example if the measured value chosen is the amplitude ratio between the maximum amplitude and the minimum amplitude. Of course, it may be envisaged to set the predetermined threshold values Aret, Kref of the magnetic field B such that all the measured values A, K of the magnetic field B are less than the predetermined threshold values Aret, Kref. In this case, for example, after each first target revolution 14, the sensor 10 'informs the processing means 13 of the measured values A, K, by performing the coding of the measured values A, K on the signal S. The invention can therefore be implemented by simple modification of the software included in the sensor 10 '. Of course, the processing means 13 are adapted to decode the signal S ', S "from the sensor 10'.
    [0007] The invention thus makes it possible to communicate to the processing means a malfunction of the system for measuring the speed and direction of rotation of the crankshaft, in this case more particularly a mounting defect, an incorrect gap between the sensor and the target, of "false round" or eccentricity of the target 14 and this at low cost, since to achieve the communication method of the malfunction according to the invention, only software-type changes are to be made to the sensor.
    权利要求:
    Claims (7)
    [0001]
    REVENDICATIONS1. A method of communicating a malfunction of a system for measuring the speed and direction of rotation of a rotary shaft to processing means (13), said system comprising: - a gear wheel associated with said rotary shaft, called a target ( 14), - a magnetic field sensor (10, 10 '), measuring values (K, A) of the magnetic field (B, B', B ") generated by the passage of the teeth (T1, T2 ... Ti ) in front of said sensor (10 ') and delivering a signal (S, S', S ") to the processing means (13), said signal (S, S ', S") comprising pulses (I) between a high state and a low state, each pulse (I) being representative of the passage of a tooth (T1, T2 ... Ti) in front of the sensor (10 '), and each pulse (I) having two predetermined duration, a first duration ( t1) representative of a first direction of rotation of the target (14), and a second duration (t2) representative of the opposite direction of rotation of the target (14), the detection method being characterized in that it comprises the following steps: - Step 1: Comparison by the sensor (10 ') between the measured values (A, K) of the magnetic field (B, B', B ") and predetermined threshold values (Aret, Kref ) of the magnetic field (B, B ', B "), - Step 2: If the measured values (A, K) of the magnetic field (B, B', B") are lower than the predetermined threshold values (Aret, Kref) of the magnetic field (B, B ', B "), then - Step 3: Generation by the sensor (10'), in a direction of rotation of the target (14), of a coding of the signal (S ', S') "), representative of the measured values (A, K) of the magnetic field (B, B ', B"), using at least a third pulse duration (t3) and at least a fourth pulse duration (t4) in order to communicate to the processing means (13) a malfunction of the system for measuring the speed and direction of rotation of the rotary shaft.
    [0002]
    2. Detection method, according to the preceding claim, characterized in that the coding is binary (0,1), the third predetermined duration (t3) having the value "0", and the fourth predetermined duration (t4) having for value "1".
    [0003]
    3. Detection method according to claim 1 or 2, characterized in that one of the measured values (A) of the magnetic field (B, B ', B ") is the amplitude of the magnetic field (B, B' , B ") during at least one turn of rotation of the target (14).
    [0004]
    4. Detection method according to claim 1 or 2, characterized in that one of the measured values (K) of the magnetic field (B, B ', B ") is the ratio of the minimum amplitude (AmIN) of the magnetic field and the maximum amplitude (AmAx) of the magnetic field for at least one turn of rotation of the target (14).
    [0005]
    5. Detection method according to any one of the preceding claims, characterized in that the third predetermined duration (t3) and the fourth predetermined duration (t4) are calculated as a function of the time between the passage of two teeth (11). , 12 .. .Ti) consecutive to a maximum rotational speed of the target (14).
    [0006]
    6. Magnetic field sensor (10 ') of a system for measuring the speed and direction of rotation of a rotary shaft, measuring values (A, K) of the magnetic field generated by the passage of the teeth (11, 12 .. .Ti) of a toothed wheel associated with said rotary shaft, called target (14) in front of said sensor (10) and delivering a signal (S, S ', S ") to processing means (13), said signal (S, S ', S ") comprising pulses (I) between a high state and a low state, each pulse (I) being representative of the passage of a tooth (11, 12 ... Ti) in front of the sensor (10 '), and each pulse (I) having two predetermined duration, a first duration (t1) representative of a first direction of rotation of the target (14), and a second duration (t2) representative of the opposite direction of rotation of the target (14), said sensor (10) being characterized in that it comprises: - storage means (30) of predetermined threshold values (Aret, Kref) of the magnetic field (B, B ', B " ) Means for comparing (31) between the measured values (A, K) of the magnetic field (B, B ', B ") and the predetermined threshold values (Aret, Kref) of the magnetic field (B, B', B); generating means (32) of at least a third predetermined duration (t3) of pulse and at least a fourth predetermined duration (t4) of pulse, to perform a binary coding of the signal ( S ', S "), representative of the measured values (A, K) of the magnetic field (B, B', B"), for the processing means (13).
    [0007]
    7. Motor vehicle comprising a sensor (10 ') of magnetic field according to the preceding claim.
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    同族专利:
    公开号 | 公开日
    FR3027388B1|2016-12-09|
    US9739228B2|2017-08-22|
    US20160108842A1|2016-04-21|
    CN105526853B|2018-02-02|
    CN105526853A|2016-04-27|
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    优先权:
    申请号 | 申请日 | 专利标题
    FR1459923A|FR3027388B1|2014-10-16|2014-10-16|METHOD FOR COMMUNICATING A DYSFUNCTION OF A SYSTEM FOR MEASURING SPEED AND ROTATION SENSES OF A ROTATING SHAFT|FR1459923A| FR3027388B1|2014-10-16|2014-10-16|METHOD FOR COMMUNICATING A DYSFUNCTION OF A SYSTEM FOR MEASURING SPEED AND ROTATION SENSES OF A ROTATING SHAFT|
    US14/843,463| US9739228B2|2014-10-16|2015-09-02|Method for communicating a malfunction of a system for measuring speed and direction of rotation of a rotary shaft|
    CN201510663577.5A| CN105526853B|2014-10-16|2015-10-15|To pass on the method for the failure for measuring the rotary speed of rotary shaft and the system of direction of rotation|
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