DE10228035B4 - Device for determining the zero crossings - Google Patents

Device for determining the zero crossings

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Publication number
DE10228035B4
DE10228035B4 DE10228035.5A DE10228035A DE10228035B4 DE 10228035 B4 DE10228035 B4 DE 10228035B4 DE 10228035 A DE10228035 A DE 10228035A DE 10228035 B4 DE10228035 B4 DE 10228035B4
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Germany
Prior art keywords
comparators
alternating signal
zero crossings
signal
characterized
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DE10228035.5A
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German (de)
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DE10228035A1 (en
Inventor
Micha Heinz
Wolfgang Joeckel
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Continental Teves AG and Co oHG
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Continental Teves AG and Co oHG
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Priority to DE10217681 priority Critical
Priority to DE10217681.7 priority
Application filed by Continental Teves AG and Co oHG filed Critical Continental Teves AG and Co oHG
Priority to DE10228035.5A priority patent/DE10228035B4/en
Publication of DE10228035A1 publication Critical patent/DE10228035A1/en
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Publication of DE10228035B4 publication Critical patent/DE10228035B4/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01PMEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/42Devices characterised by the use of electric or magnetic means
    • G01P3/44Devices characterised by the use of electric or magnetic means for measuring angular speed
    • G01P3/48Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
    • G01P3/481Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60TVEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/321Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration deceleration
    • B60T8/329Systems characterised by their speed sensor arrangements
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60KARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K28/00Safety devices for propulsion-unit control, specially adapted for, or arranged in, vehicles, e.g. preventing fuel supply or ignition in the event of potentially dangerous conditions
    • B60K28/10Safety devices for propulsion-unit control, specially adapted for, or arranged in, vehicles, e.g. preventing fuel supply or ignition in the event of potentially dangerous conditions responsive to conditions relating to the vehicle 
    • B60K28/16Safety devices for propulsion-unit control, specially adapted for, or arranged in, vehicles, e.g. preventing fuel supply or ignition in the event of potentially dangerous conditions responsive to conditions relating to the vehicle  responsive to, or preventing, skidding of wheels
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60TVEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T2240/00Monitoring, detecting wheel/tire behaviour; counteracting thereof
    • B60T2240/04Tire deformation
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2520/00Input parameters relating to overall vehicle dynamics
    • B60W2520/28Wheel speed

Abstract

Device for determining the zero crossings of at least one alternating signal of a rotary position sensor, wherein the alternating signal to the input of two counter-working comparators (1, 2) is guided and one comparator (1) the negative zero crossings and the other comparator (2) determines the positive zero crossings , characterized in that the comparators (1, 2) is preceded by an inverter, which inverts the alternating signal, so that the comparators (1, 2) an inverted and a non-inverted alternating signal is supplied.

Description

  • The invention relates to a device for determining the zero crossings according to the preamble of claim 1.
  • Magnetic rotary position sensors can generally be used to gain electrical measurement signals that depend on the angle of rotation when a device rotates. Known rotary position encoders contain a layer of magnetizable material as a code carrier. Magnetization changes or transitions are written into this layer by means of a magnetic head along a track. The inscribed code pattern has permanent magnetic areas or poles, with alternately arranged, preferably strip-shaped, north and south poles (N, S). This pattern is scanned by one or more magnetic field sensitive elements. The elements are arranged rigidly at a distance from the poles or areas, facing the poles or areas of the code carrier. The strip-shaped magnetic areas or poles are chosen so that a statement about the angle of rotation with respect to a predetermined reference position is possible with the aid of the magnetic field-sensitive elements and an evaluation electronics associated therewith.
  • From the WO 96/10505 A1 , of the DE 196 26 843 A1 , of the WO97 / 44673 A1 In the tire sidewalls of a motor vehicle pneumatic tire embedded magnetizable layers are known which use magnetoresistive sensors for reading the pattern. There are therefore preferably applications in the field of regulated systems with brake intervention ABS, ASR, ESP provided, in particular those systems that use a deformation of tire rubber under load for the measurement or determination of forces or torques. A method known by the term "Side Wall Torsion Sensor (SWT)" is disclosed in U.S.P. DE 44 35 160 A1 described. In the DE 44 35 160 A1 It is proposed to measure the phase shift of two wheel speed signals for the determination of longitudinal and transverse forces on a magnetically encoded tire and at the same time to conclude on the size of transverse accelerations via air gap deformations and the thus variable signal amplitudes. In the rubber of the sidewall of the tire, a permanent magnetic track of strip-shaped alternating north / south polar areas is integrated, which form a ring. If the rolling tire is braked or accelerated, the side wall slightly twists. The strength of the twist is detected by two vertically superimposed magnetic field sensitive elements or sensors on the time delay of the zero crossings of their signal voltages, which arises because the upper and the lower zone of the permanent magnetic strips move against each other when the side wall twists. After the time delay of the zero crossings, the duration of the subsequent complete signal period is also measured. Immediately afterwards, by dividing the duration of the time delay of the zero crossings by the duration of the complete signal period, a sampling value of the temporal phase angle change is calculated. The number of samples per wheel revolution (corresponding to approx. 2 m travel) is limited to the number of north / south pole pairs of the encoder track of the tire sidewall.
  • From the WO 01/19655 A1 For example, it is known to generate a square wave signal from the sinusoidal signal with a comparator and a bi-directional (symmetrical) hysteresis. The dimensioning of the hysteresis leads either to a required zero-point accuracy or interference suppression. With good interference suppression (high hysteresis), switching at zero is very inaccurate.
  • The invention has for its object to increase the accuracy of determining the phase shift of two sinusoidal alternating signals while reducing the susceptibility.
  • This object is achieved in a generic device in that the signal is fed to the input of two counter-rotating comparators and one comparator determines the positive zero crossings and the other comparator the negative zero crossings. It is advantageous that the comparators are connected in parallel. The inventive circuit is advantageously a curve-independent switching at zero point, or switching at U / 2 when the input signal is not a pure sine wave alternating signal.
  • Due to the circuit, a large hysteresis (interference suppression) is possible, without influencing the zero point detection.
  • In addition, advantageously, a rectangular signal can be generated in which both edges correspond exactly to the zero crossings of the original signal.
  • To further increase the accuracy, it is expedient that the comparators have an asymmetrical hysteresis and that the hysteresis of the comparators is adjustable.
  • To further improve the determination of the phase shift, a pulse shaper is connected downstream of the two comparators, at the inputs of which the two output signals of an asymmetrical duty cycle of the comparators are present and which is a rectangular signal DIG_OUT generated, in which each edge corresponds to a zero crossing of the alternating signal.
  • The accuracy of the determination is advantageously further increased by virtue of the fact that the comparators are preceded by an inverter which inverts the alternating signal, so that an inverted signal and a non-inverted signal are fed to the comparators. Particularly advantageous is the use of the device for highly accurate zero point determination of at least one alternating signal of a rotation angle position sensor according to one of claims 1 to 5 for determining the phase shift of two alternating signals provided when detecting deformations of magnetically encoded vehicle tires, with at least two magnetic field sensitive elements in different Distance to the tire rotation axis are stationary mounted on the vehicle and interact with at least one magnetic track of the vehicle tire arise, the evaluated change signals of a motor vehicle control, such as ABS, ASR, ESP u. Like., Are supplied as input.
  • An embodiment is shown in the drawing and will be described in more detail below.
  • Show it
  • 1 a circuit for accurately determining the zero crossings of an alternating signal
  • 2 a cross section through the shell of a pneumatic tire containing the coded zones with embedded permanent magnetic areas
  • 3 a side view of the tire
  • 4 a deformation of the encoder track of the tire
  • 5 a representation of the in the circuit 1 generated signals
  • The 1 shows a circuit 20 for determining the zero crossings of at least one alternating signal 21 a rotary position sensor. As a rotary position sensor is preferably in 2 Tire sensor provided in a vehicle provided in more detail.
  • These 2 illustrates that magnetizable layers 11 . 12 on or in the rotatable part of a vehicle, for example a tire 15 , are provided. In the layer 11 . 12 According to the principle of magnetization, the information is inscribed as a magnetization pattern, so that the at least one track has coded zones. The coded zones 11 and 12 are located in the lateral tire wall of the vehicle wheel indicated only. The rim body is in 2 With 18 symbolizes.
  • Tires rotate around a wheel center. In many application examples, it is therefore expedient to use the coded zones 11 . 12 on circular arcs, concentric with the center of the wheel axle. 3 shows an example of a tire with distributed over the entire circumference evenly distributed, permanent magnetic areas or poles. In the side wall of the tire is an integer series of similar, alternating, linear or strip-shaped north and south pole areas embedded, the one closed, concentric to the wheel center circular path 13 form. Here, N symbolizes a North Pole area, S a South Pole area. Such an encoder 17 is in connection with a stationary or rigid sensor device with magnetic field sensitive elements z. B. suitable for measuring the rotational behavior of a vehicle wheel as an input variable of a motor vehicle control system. The integrated in the tire wall or arranged on the tire wall coded zones 11 . 12 serve in this application as a signal or transmitter. Particularly suitable are active sensor devices with magnetoresistive elements or with Hall elements. In principle, all types of signal transducers or sensor types can be used which react to permanent magnetic fields, the change of these fields or polarity changes. Of course, it is also possible in principle to use passive signal pickups or coil systems in which signals are induced by the change in the magnetic field as a result of the rotation of the tire.
  • The incremental trace of uniform north / south polar regions of the tire carrier serving as code carrier contains a powder mixture which is permanently magnetized. 3 shows strip-shaped permanent magnetic areas of the encoded sidewall 24 that deform under load 25 , There are two sensors 26 . 27 present, which are mutually offset, possibly even radially offset from each other, near the ends of the magnetized strips and detect the location-dependent magnetic field of the encoder track. They produce by their arrangement to each other two electrical signal voltages 28a and 29a , When twisting the side wall under load, this initial state changes in a changed mutual phase position 28b . 29b a phase angle deviation, which is measured continuously and the sinusoidal alternating signal according to the invention to be further processed. The sinusoidal alternating signal 28a . 29a will each be at the inputs 30 . 31 of two parallel counteracting comparators 1 . 2 placed. Both comparators 1 . 2 have an asymmetrical hysteresis, ie that they switch at the zero point, but only switch back to a lower or higher voltage beyond the zero point, depending on the hysteresis set. In the illustrated circuit comparator detected 1 the negative zero crossings and comparator 2 the positive zero crossings. The result is two square-wave signals COMP1_OUT and COMP2_OUT ( 5 ) with asymmetrical duty cycle. Both signals have in common that each positive edge corresponds to a zero crossing of the alternating signal. In the pulse shaper, a square-wave signal DIG_OUT ( 5 ), where each edge corresponds to a zero crossing. If you now have two analog signals whose phase shift is to be measured, the arrangement described above is constructed for each analog signal. The phase shift of the two square wave signals can then be determined very precisely digital. In the stated construction, the input signal is again inverted and both signals, inverted and non-inverted, are applied to the comparators 1 . 2 given. By evaluating the difference signal common mode influences are suppressed. The transistors T1 and T2 cause in conjunction with R6 and R9, and R8 and R10, the hysteresis. The hysteresis can be set via the respective voltage divider ratio.

Claims (6)

  1. Device for determining the zero crossings of at least one alternating signal of a rotary position sensor, wherein the alternating signal to the input of two counter-rotating comparators ( 1 . 2 ) and a comparator ( 1 ) the negative zero crossings and the other comparator ( 2 ) determines the positive zero crossings, characterized in that the comparators ( 1 . 2 ) is preceded by an inverter, which inverts the alternating signal, so that the comparators ( 1 . 2 ) an inverted and a non-inverted alternating signal is supplied.
  2. Device according to Claim 1, characterized in that the comparators ( 1 . 2 ) are connected in parallel.
  3. Device according to Claim 1, characterized in that the comparators ( 1 . 2 ) have an asymmetric hysteresis.
  4. Device according to Claim 3, characterized in that the hysteresis of the comparators ( 1 . 2 ) is adjustable.
  5. Device according to Claim 1, characterized in that the two comparators ( 1 . 2 ) is followed by a pulse shaper, at whose inputs the two, an asymmetric duty cycle having output signals of the comparators ( 1 . 2 ) and generates a square wave signal (DIG_OUT) in which each edge corresponds to a zero crossing of the alternating signal.
  6. Use of the means for determining the zero crossings of at least one alternating signal according to one of claims 1 to 5 for determining the phase shift of two alternating signals of a tire sensor, which results from detecting deformations on magnetically coded vehicle tires, with at least two magnetic field sensitive elements which are at different distances from the tire rotation axis are stationarily mounted on the vehicle and cooperate with at least one magnetic track of the vehicle tire, wherein the evaluated alternating signals are supplied to a motor vehicle control as an input variable.
DE10228035.5A 2002-04-19 2002-06-24 Device for determining the zero crossings Active DE10228035B4 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE10217681 2002-04-19
DE10217681.7 2002-04-19
DE10228035.5A DE10228035B4 (en) 2002-04-19 2002-06-24 Device for determining the zero crossings

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE10228035.5A DE10228035B4 (en) 2002-04-19 2002-06-24 Device for determining the zero crossings

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DE10228035A1 DE10228035A1 (en) 2003-11-06
DE10228035B4 true DE10228035B4 (en) 2016-10-27

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Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3955102A (en) * 1973-11-21 1976-05-04 Digital Equipment Corporation Zero crossing detecting circuit
US4516178A (en) * 1982-09-15 1985-05-07 Ampex Corporation Cylinder crossing detection circuit for disc drive or the like
DE3638298A1 (en) * 1986-11-10 1988-05-11 Vdo Schindling Method and device for determining the angle speed from two signals, which are each function of the angle of rotation
US5153513A (en) * 1990-05-25 1992-10-06 Zexel Corporation Apparatus for processing output signal of sensor with magnetic rotary member
US5212444A (en) * 1991-07-31 1993-05-18 Magnetek Controls Detection of damped sine waves in a magnestostrictive displacement transducer using pretrigger and detection thresholds of opposite polarity
DE4435160A1 (en) * 1994-09-30 1996-04-04 Continental Ag Device for determining the peripheral force of a vehicle wheel
DE19543483A1 (en) * 1995-11-22 1997-05-28 Hannes Weigel Angle measurement method, e.g. for data storage device, e.g. disc drive
WO1997044673A1 (en) * 1996-05-22 1997-11-27 Itt Manufacturing Enterprises, Inc. Device for detecting the rotary behaviour of a vehicle wheel
DE19626843A1 (en) * 1996-07-04 1998-01-08 Continental Ag Device for measuring the rotational frequency of a rotating vehicle wheel and vehicle tires suitable for use therein
DE19640760A1 (en) * 1996-10-02 1998-04-09 Bosch Gmbh Robert Inductuve sensor circuit
WO2001019655A1 (en) * 1999-09-15 2001-03-22 Continental Teves Ag & Co. Ohg Device comprising at least two sensors, especially tire sidewall torsion (swt) sensors
EP1093224A2 (en) * 1999-10-11 2001-04-18 Asm Automation, Sensorik, Messtechnik Gmbh Pulse detector and method for the detection of sinusoidal pulses

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3955102A (en) * 1973-11-21 1976-05-04 Digital Equipment Corporation Zero crossing detecting circuit
US4516178A (en) * 1982-09-15 1985-05-07 Ampex Corporation Cylinder crossing detection circuit for disc drive or the like
DE3638298A1 (en) * 1986-11-10 1988-05-11 Vdo Schindling Method and device for determining the angle speed from two signals, which are each function of the angle of rotation
US5153513A (en) * 1990-05-25 1992-10-06 Zexel Corporation Apparatus for processing output signal of sensor with magnetic rotary member
US5212444A (en) * 1991-07-31 1993-05-18 Magnetek Controls Detection of damped sine waves in a magnestostrictive displacement transducer using pretrigger and detection thresholds of opposite polarity
DE4435160A1 (en) * 1994-09-30 1996-04-04 Continental Ag Device for determining the peripheral force of a vehicle wheel
WO1996010505A1 (en) * 1994-09-30 1996-04-11 Continental Aktiengesellschaft Method and device for regulating slip and/or determining longitudinal force or a value proportional to flexing work, and vehicle tyres therefor
DE19543483A1 (en) * 1995-11-22 1997-05-28 Hannes Weigel Angle measurement method, e.g. for data storage device, e.g. disc drive
WO1997044673A1 (en) * 1996-05-22 1997-11-27 Itt Manufacturing Enterprises, Inc. Device for detecting the rotary behaviour of a vehicle wheel
DE19626843A1 (en) * 1996-07-04 1998-01-08 Continental Ag Device for measuring the rotational frequency of a rotating vehicle wheel and vehicle tires suitable for use therein
DE19640760A1 (en) * 1996-10-02 1998-04-09 Bosch Gmbh Robert Inductuve sensor circuit
WO2001019655A1 (en) * 1999-09-15 2001-03-22 Continental Teves Ag & Co. Ohg Device comprising at least two sensors, especially tire sidewall torsion (swt) sensors
EP1093224A2 (en) * 1999-10-11 2001-04-18 Asm Automation, Sensorik, Messtechnik Gmbh Pulse detector and method for the detection of sinusoidal pulses

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