CN105301277A - Static testable wheel speed sensor - Google Patents
Static testable wheel speed sensor Download PDFInfo
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- CN105301277A CN105301277A CN201510386230.0A CN201510386230A CN105301277A CN 105301277 A CN105301277 A CN 105301277A CN 201510386230 A CN201510386230 A CN 201510386230A CN 105301277 A CN105301277 A CN 105301277A
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- ZINJLDJMHCUBIP-UHFFFAOYSA-N ethametsulfuron-methyl Chemical compound CCOC1=NC(NC)=NC(NC(=O)NS(=O)(=O)C=2C(=CC=CC=2)C(=O)OC)=N1 ZINJLDJMHCUBIP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P21/00—Testing or calibrating of apparatus or devices covered by the preceding groups
- G01P21/02—Testing or calibrating of apparatus or devices covered by the preceding groups of speedometers
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Abstract
A speed sensor, in particular formed as a wheel speed sensor, comprises at least one magnetic field sensor element for detecting a magnetic encoder, and at least one signal processing circuit which processes the output signals of the at least one magnetic field sensor element and providing the sensor output signal of the speed sensor. The speed sensor comprises a test circuit connected between the at least one magnetic field sensor element and the signal processing circuit, and is designed so that it is switchable between a test mode and a normal operating mode. The one magnetic field sensor element is designed as a bridge circuit magnetic field sensitive element, and comprises at least two or three or more partial bridges or half-bridges, wherein each partial bridge provides an output signal of the magnetic sensor element. The test circuit differently affects at least a first partial bridge and a second partial bridge, and provides the signal to the signal processing circuit.
Description
Technical field
The present invention relates to a kind of speed pickup as described in the preamble according to claim 1, especially wheel speed sensor, and this speed pickup is especially applied on motor vehicle as wheel speed sensor.
The object of the invention is suggestion a kind of itself safety and/or testable speed pickup, the static magnetic field especially by applying from outside is checked or tests this speed pickup.
This object is realized by speed pickup according to claim 1 according to the present invention.
Background technology
So-called magnetic coder is preferably interpreted as and a kind ofly especially carries the angle scale of increment type magnetic coding and/or the mechanical organ of length scales.Can also adopt ferromagnetic gear and/or tooth bar or orifice plate and/or core pin as scrambler, described component is combined with permanent magnet and produces variable magnetic air gap.On the other hand, described scrambler can be magnetic coder, have one with the scrambler magnetic track of magnetic coding pattern (Muster), such pattern especially can be the integer sequence in the permanent magnetism arctic/region, the South Pole, described region with the sequence replaced substantially straight line extend or form the scrambler magnetic track of round sealed, such as, be arranged in wheel bearing O-ring seal.The pulse transmitter that magnetic coder is especially used as rotary speed detecting system and/or detects in the device of rotating speed.
Summary of the invention
Test circuit is preferably designed for the output signal at least affecting the mat woven of fine bamboo strips one point of electric bridge, and do not affect the output signal of second point of electric bridge, or at least described test circuit affects the output signal of first and second points of electric bridges in a different manner, or this test circuit is designed to the output signal at least affecting a point of electric bridge at least three points of electric bridges, make especially to produce different impacts to the output signal of first, second, and third point of electric bridge, impact different from each other especially respectively.
Magnetic field sensing element preferably includes two or three point of electric bridge, and its output signal especially can be transported in difference test channel of test circuit.
In order to affect first point of bridge output signal, test circuit preferably includes the first test channel, and the output signal especially in order to affect second point of electric bridge comprises the second test channel.
Suitable is, test circuit is designed to especially make test circuit be switched to test mode of operation from normal operation mode by means of only external test mode signal, and when especially there is not test mode signal, keep normal operation mode or switching to get back to normal operation mode.
Test circuit is preferably so formed, described test circuit comprises to switch between normal operation mode and test mode of operation the electric switch that at least one is especially configured to semiconductor switch, wherein, this at least one switch is designed to programmable worthily and/or provides test mode signal by programming.
This test circuit is preferably designed for independently understands test mode signal, and is independently switched to corresponding operational mode according to test mode signal.
Speed pickup preferably at least has the first and second electric switches, wherein, this first switch forms and connects into and in the normal operating mode the output signal of first point of electric bridge is directly supplied to signal processing circuit substantially, and in test mode the output signal of the mat woven of fine bamboo strips one point of electric bridge is supplied to the first test channel of test circuit, wherein, this first test channel is connected with signal processing circuit at outgoing side, and wherein especially second switch structure and be connected in the normal operating mode the output signal of second point of electric bridge is directly supplied to signal processing circuit substantially, and in test mode the output signal of second point of electric bridge is supplied to the second test channel of test circuit, wherein, second test channel is connected with signal processing circuit at outgoing side.
Suitable, this test circuit fits at least one output signal or multiple output signal of being designed to make at least one magnetic field sensing element under test mode of operation
-by least one time-lag network, especially programmable time-lag network postpones the retardation time of a regulation, particularly preferably the retardation time of 0ms or 1ms or 10ms or 1s substantially, and/or
-being especially designed to programmable amplification or attenuator circuit by least one amplifies or the amplification coefficient/attenuation coefficient of decay one regulation, and wherein, amplification coefficient or attenuation coefficient are preferably essentially 2 or 10 or be greater than 10 or 100 or be greater than 100, and/or
-reverse by least one negative circuit and/or a voltage inverter, and/or
-alternately interrupt with having beat or transmission by means of the generator and/or oscillator driving at least one on-off element of control,
And after this further output signal is being transferred to signal processing circuit and/or is being supplied to signal processing circuit, wherein, especially at least the first and/or second test channel is designed to the output signal affecting at least the first and/or second point of electric bridge by this way.
Suitable is, this test circuit, especially at least the first and/or second test channel is designed at least one output signal postponing at least one magnetic field sensing element by means of at least one time-lag network, or the output signal of first or second point of electric bridge of delay magnetic field sensing element, selection like this and define described delay, is not considered when this signal is checked by means of check circuit in signal processing circuit.
This test circuit is particularly preferably designed so that the first test channel postpones the output signal of first point of electric bridge in test mode and/or amplifies or decay and/or reverse, and/or by means of at least driving generator and/or cycle oscillator ground/with having beat alternately interruption or the transmission of a control on-off element.More particularly preferably be, so formed in the second test channel of this this test circuit, the output signal of the described mat woven of fine bamboo strips two test channel to second point of electric bridge postpones and/or amplifies or decay and/or reverse in test mode, and/or by means of driving the control generator of at least one on-off element and/or cycle oscillator ground/alternately interrupt with having beat or transmit described output signal.But at this moment, first and this second test channel of test circuit are so formed, and the impact of the first test channel on first point of bridge output signal is different from the impact of the second test channel on second point of bridge output signal.
This speed pickup preferably designs like this, makes when magnetic field sensing element loads with static magnetic field, and just as during loading alternating magnetic field, hourly velocity sensor is tested.The especially true formation of this speed pickup, makes to simulate at least one fault-signal in order to the self diagnosis of test speed sensor by means of test circuit at magnetic field sensing element by during action of alternating magnetic field.
Suitable is, this signal processing circuit is designed at least have the check circuit so formed, described check circuit can carry out confidence level test and/or compare between two or more signal, especially compare between the signal being directly supplied to signal processing circuit in the output signal of point electric bridge tested person circuit impact respectively as magnetic field sensing element or the impact of non-tested person circuit, wherein, in signal amplitude and/or signal frequency, carry out confidence level test and/or compare.The check circuit of this signal processing circuit be particularly preferably designed to from confidence level test and/or relatively obtain about at least one magnetic field sensing element and/or test circuit and/or signal processing circuit Functional Capability/functional information, and especially in velocity transducer output signal, provide this information.
This test circuit is preferably designed for and at least one generator and/or oscillator is run with assigned frequency between 0Hz to 2500Hz.
This test circuit is designed to make at least one generator and/or oscillator drive control one or two or more current sources or voltage source particularly by least one electrical switch element worthily, wherein, especially when described current source or voltage source pass through the switch activator arranged, this at least one current source or voltage source produce the Electronic Testing source signal of regulation, and do not produce test source signal when described current source or voltage source pass through the switch deactivation arranged, wherein, this test source signal in test circuit and/or in signal processing circuit with at least one another Signal averaging, this test source signal is especially evaluated and/or then carry out confidence level test with at least one another signal and/or compare, or wherein, this test source signal directly carries out confidence level test with at least one another signal and/or compares in test circuit and/or signal processing circuit.Even if test circuit and/or signal processing circuit are particularly preferably designed to when magnetic field sensing element detects the magnetic field of magnetic field intensity substantial constant, also at least one current source of control or voltage source generation alternating signal can be driven by generator and/or oscillator.
Suitable is, first of test circuit and/or second and/or the 3rd test channel be designed so that first and/or second and/or the output signal of the 3rd point of electric bridge especially affect by other signal transacting influence factor one or more, such as postpone, amplify or decay, reverse/anti-phase (invertieren), interrupt or conducting, superposition and/or cumulative one or more alternating signal produced by means of at least one generator and/or oscillator.
This test circuit is preferably designed for and makes at least one electric switch idle in the normal operating mode and especially connect under test mode of operation.
This speed pickup preferably has test circuit, and this test circuit is connected between at least one magnetic field sensing element and signal processing circuit, and is designed to switch between test pattern and normal operation mode.
The element of magnetic field sensing element and/or its magnetic-field-sensitive or point electric bridge, especially bridge circuit are preferably designed for Hall element and/or anisotropic magnetoresistive sensor element or AMR element and/or giant magneto-resistance sensor element or GMR element and/or tunnel magneto-resistive sensor element or TMR element.
Test mode signal preferably provides as external magnetic field, or this test mode signal is encoded in external magnetic field, and wherein, this external magnetic field is detected by least one magnetic field sensing element.
Suitable, test circuit is designed to especially at least an official hour section, the external magnetic field with the minimum-B configuration intensity of regulation be identified outer test mode signal, and wherein this magnetic field intensity is constant substantially.
At least one magnetic field sensing element be preferably configured to magnetic field sensing element bridge circuit and have two or three or more point electric bridge or half-bridge, wherein, this point of electric bridge provides the output signal of a magnetic field sensing element respectively.
It is suitable that this test circuit is so formed, and at least one electric switch is idle/inactive in the normal operating mode, and is especially switched under test mode of operation.
This test circuit is preferably so formed, make test mode signal own by least one in test circuit, especially programmable or able to programme drive control generator and/or oscillator provide, or this test mode signal drives at least one generator and/or oscillator driving control especially able to programme or able to programme of control.
Test circuit is particularly preferably so formed, at least one generator and/or oscillator is made to drive at least one electric switch of control, and especially in test mode with at least one electric switch of frequency error factor of regulation, especially alternating signal can be produced, even if this magnetic field sensing element detects the magnetic field of magnetic field intensity substantial constant with this.At this, test circuit is particularly preferably so formed completely, and at least one generator and/or oscillator are run with the assigned frequency between 0Hz to 2500Hz.
Test circuit is preferably so formed, at least one generator and/or oscillator is made to drive the one or two or more current source of control or voltage source particularly by least one electric switch or respectively by an electric switch, wherein, especially when described current source or voltage source pass through the switch activator arranged, this at least one current source or voltage source produce the test source signal of the electricity of regulation, then test source signal is not produced when described current source or voltage source pass through the switch deactivation arranged, wherein, this test source signal in test circuit and/or in signal processing circuit with at least one another Signal averaging, this test source signal is especially evaluated and/or then carry out confidence level test with at least one another signal and/or compare, or wherein, this test source signal directly carries out confidence level test and/or compares at this test circuit and/or in signal processing circuit with at least one another signal.
Suitable is, test circuit and/or signal processing circuit are designed to, even if when magnetic field sensing element detects the magnetic field of magnetic field intensity substantial constant, also can by producing alternating signal by generator and/or at least one current source of a pair of oscillators or the driving control of voltage source.
This at least one magnetic field sensing element be preferably designed to magnetic field sensing element bridge circuit and have two or three or more point electric bridge or half-bridge, wherein, this point of electric bridge provides the output signal of a magnetic field sensing element respectively.
Test channel is preferably interpreted as to the test path of test circuit.
In addition, the invention still further relates to speed pickup as wheel speed sensor application in a motor vehicle.
Accompanying drawing explanation
Multiple embodiments of speed pickup or test circuit are schematically set forth with reference to accompanying drawing 1,2 and 3.
Embodiment
At this, illustrate with reference to Fig. 1 citing and comprise two half-bridges, i.e. the configuration structure of the magnetic field sensing element 3 of first and second points of electric bridges 1,2.
This test circuit comprises one or more following features alternatively:
The definition (switch) of-switch, will consider signal path carries out distinguishing (able to programme) between " test pattern " and " normally running " each
The delay of-signal, may in situation by variable retardation time (τ, τ ` ... n τ)
The amplification of-signal or decay (α, β ...)
The reverse of-signal or anti-phase (voltage signal negate Usignal →-Usignal)
Shown switch is it is noted that to only have instruction just can be switched to test pattern.(not having instruction) is normally run and is remained unchanged.Amplification coefficient/attenuation coefficient and time delay can be designed for specific application.
Can wish, greatly can reduce amplification coefficient or even be set to " zero ", the selection that retardation time can be so large, make not consider corresponding signal path a specific moment during test pattern.In addition, such possibility is also provided, between multiple signal path, carries out cross-check, or the confidence level test being used in Fault Identification becomes possibility, such as, should test whether can identify irrational signal amplitude, irrational signal frequency etc. a specific moment.
Exemplary background illustrates:
When normally running, ASIC or signal processing circuit and/or test circuit obtain its input signal by the electric change of electric bridge-half-bridge (analog voltage signal) (according to the revolution of scrambler dynamically), and this input signal time delay reaches its minimum and peak swing.
Signal amplitude changes along with external magnetic field strength (being determined by the distance of scrambler to sensor).
The service voltage of bridge circuit and the sensitivity of bridge structure prespecified for each design.
Static Detection scheme according to the embodiment of Fig. 1 can shorten the test duration significantly.
Magnetic field intensity can realize with bar-shaped magnet.In order to check that internal fault identification (cross-check) not only can use scrambler, and coil system can be used.
Embodiment in Fig. 1 illustrates the device 11 for generation of static or stationary magnetic field, and wherein, this magnetic field is detected by point electric bridge 1 and 2 of magnetic field sensing element 3.The electric bridge of magnetic field sensing element 3 comprises voltage source 12.Signal 1 and signal 2 are the mat woven of fine bamboo strips one and second point of electric bridge 1, the output signal of 2, described output signal is fed to node 9 respectively by prime amplifier 8, on described node, first and second switches 4, whether 5 exist the respective branch of the first or second test channel 6,7 be switched under test pattern depending on test mode signal, or be switched to the signal processing circuit 10 under normal operation mode.Signal processing circuit 10 just schematically, exemplarily shows a comparer and analog to digital converter.On the output terminal of signal processing circuit 10, this speed pickup provides sensor output signal 16.First and second test channel 6,7 are differently formed, to produce different impacts to the output signal of first and second points of electric bridges 1,2.At this, the parallel circuit of the first test channel 6 comprises phase inverter 14 or voltage inverter and attenuation coefficient to be α and retardation time the be decay-time lag element 15 of τ.Second test channel 7 comprises the parallel circuit of amplifier 13 and decay time lag element 15, and the attenuation coefficient of this decay time lag element 15 is β and retardation time is τ.
In test mode different impacts is produced on the output signal of these two points of electric bridges 1 and 2 by the first and second test channel 6 and 7, the signal be input on the comparer of signal processing circuit is different in test mode, although the magnetic field detected is static or constant, but comparer can switch, therefore the output signal of two points of electric bridges 1 and 2 is substantially equal or have identical level.
With reference to Fig. 2 and 3, illustrate the configuration structure of magnetic field sensing element 3 equally respectively, comprise two half-bridges or point electric bridge 1 and 2, comprise the voltage source 12 of electric bridge and produce device 11 that is constant or static magnetic field.
By switching ASIC or signal processing circuit targetedly, input signal and the output signal of point electric bridge of magnetic field sensing element enter in test channel 6 and 7 (see Fig. 2), or by accessing bias current by means of the current source 17 of a generator control respectively, superpose self-test channel 6 by periodic on-off element 18, the output signal (see Fig. 3) of dividing electric bridge of 7, such as can produce new signal, the head end test (feasible/infeasible inspection) that described new signal makes ASIC function " apply distinctive " becomes possibility, although do not detect alternating magnetic field, but detect static magnetic field 11.
This switches targetedly and following one or more may scheme can be bonded to each other, to provide power of test good as far as possible.One or more signal path can be related to independently of one another like this.The number of signal path depends on the structure of sensor construction or magnetic field sensing element 3, that is, the number of operational half-bridge or point electric bridge 1,2 (1 to N) in the chip of WSS (abbreviation of wheel speed sensor).For WSS application, general use 2 or 3 half-bridges.
The embodiment with two half-bridges is illustrated in accompanying drawing.
In the embodiment shown in Figure 2, by corresponding switch 4,5 (switch 1 and switch 2) realizes switching targetedly between test pattern and normal operation mode, and described switch is only connected in test mode by " generator/oscillator " circuit realized in ASIC.At this, the frequency f of generator/oscillator is constant, and is defined as arbitrary value (usually: 0Hz < f < 2500Hz) in the signal frequency range that can determine at application conditions.
Shown switch 4,5 is exemplary at Fig. 2, and only activates in test mode.There is not test pattern instruction, or do not have test mode signal or the normal test mode signal running coding, maintenance normally runs constant, and shown switch is inoperative when normal operation.
Amplification coefficient/attenuation coefficient and time delay can for application specific designs.
If desired, amplification coefficient can reduce greatly, or even installs as " zero ", or may be selected to be retardation time large like this, makes during test pattern no longer considered at the moment determined a corresponding signal path.Thus provide the possibility of carrying out cross-check between multiple signal path, and such as when needs detect whether can identify irrational signal amplitude in particular moment, during irrational signal frequency etc., the rationality checking being used in Fault Identification becomes possibility.
Use as " error injection " in the scope that such confidence level test can require at functional safety.
As an alternative, simplified example circuit can be passed through, as shown in Figure 3, by connecting " bias current ", even if also can check the handoff functionality of ASIC-output stage when external magnetic field is constant.
Switched targetedly by corresponding on-off element 18, described on-off element is only connected in test mode by " generator/oscillator " circuit realized in ASIC.
The frequency f of generator/oscillator is constant, and in the signal frequency range that can determine at application conditions to be defined as arbitrary value (general: 0Hz < f < 2500Hz).
Exemplary background illustrates:
When normally running, ASIC or signal processing circuit and/or test circuit obtain its input signal by the electric change (rotating dynamic change according to scrambler) of electric bridge-half-bridge (analog voltage signal), and described input signal time delay ground reaches its minimum and peak swing.
This signal amplitude changes along with the magnetic field intensity (being determined by the distance of scrambler to sensor) of outside.Each when the service voltage of this bridge circuit and the sensitivity of bridge structure are all pins do not have meter scheme prespecified.
According to the embodiment of Fig. 3, the inspection of sensor functionality then requires that scrambler rotates the long period in a dynamic condition, or drives the control long period to coil system, and the time is very valuable at production period.
ω and external magnetic field strength (scrambler etc.) frequency dependence.
relevant to the distance of half-bridge, and relevant to magnetic pole length (scrambler) in the conceived case
X signal amplitude is relevant to the sensitivity of bridge structure S, the service voltage of electric bridge and external magnetic field strength.
Static measurement scheme according to the embodiment of Fig. 2 and 3 can shorten the test duration significantly.Magnetic field intensity can realize with bar magnet.In order to identify that the inspection that internal fault (cross-check) is carried out not only can use scrambler, and coil system can be used.
Schematically exemplarily illustrate in Fig. 2, by means of the first and second switches 4,5, the output signal of first and second points of electric bridges 1,2 is linked into test channel 6 and 7 in test mode.In the first test channel 6, the output signal of the mat woven of fine bamboo strips one point of electric bridge 1 produces beat by means of beat generator 19 or alternately interrupts and conducting, wherein, this cadence signal/clock signal also by the parallel circuit that the decay time lag element 15 of to be α and retardation time by phase inverter 14 or voltage inverter and attenuation coefficient be τ is formed, or by this and column circuits affect.In the second test channel 7, the output signal of second point of electric bridge 2 produces beat by means of beat generator 19 equally or alternately interrupts and conducting, wherein, the parallel circuit that still formed by the decay time lag element 15 of to be β and retardation time by amplifier 13 and attenuation coefficient be τ of this cadence signal/clock signal affecting by this.At this, generator 19 drives control one on-off element 18 respectively.Like this by test channel 6 and 7 in test mode affected signal be applied on the comparer of signal processing circuit 10 at input side, for described signal processing circuit, it it only show analog to digital converter.The sensor output signal 16 of speed pickup is provided at the outgoing side of signal processing circuit 10.
The output signal of point electric bridge 1 and 2 exemplary in figure 3 superposes from the bias current signal in view of two test channel 6 and 7 with different strength of current in test mode, and this biasing circuit signal is alternating signal.For this reason, test channel 6 and 7 has the generator 19 with the timeticks determined, described generator drives control current source 17 by means of on-off element 18 respectively in test channel 6 and 7, and its output signal superposes with the output signal of point electric bridge.Corresponding composite signal is applied in the input side of the comparer of signal processing circuit 10, and described signal processing circuit also comprises analog to digital converter and provides the sensor output signal 16 of speed pickup.
Claims (14)
1. a speed pickup, especially wheel speed sensor is designed to, comprise at least one for detecting magnetic field sensing element and at least one signal processing circuit of magnetic coder, the output signal of this at least one magnetic field sensing element of signal processing circuit process also provides the sensor output signal of speed pickup, wherein, this speed pickup has test circuit, this test circuit to be connected between at least one magnetic field sensing element and described signal processing circuit and to be designed to switch between test pattern and normal operation mode, wherein, this at least one magnetic field sensing element be designed to the element of magnetic-field-sensitive bridge circuit and have two or three or more point electric bridge or half-bridge, wherein, these point of electric bridge provides the output signal of a magnetic field sensing element respectively,
It is characterized in that,
Then the output signal that described test circuit is designed to differently affect at least one first and second points of electric bridge is also supplied to described signal processing circuit.
2. speed pickup according to claim 1, it is characterized in that, test circuit is designed to the output signal at least affecting first point of electric bridge, and does not affect the output signal of second point of electric bridge, or described test circuit affects the output signal of first and second points of electric bridges at least in a different manner
Or
Test circuit is designed to the output signal of point of electric bridge at least affected at least three points of electric bridges, especially differently affects the output signal of first, second, and third point of electric bridge, especially affects differently from one another respectively.
3. according to the speed pickup of claim 1 or 2, it is characterized in that, test circuit comprises the first test channel in order to the output signal affecting first point of electric bridge, and the output signal especially in order to affect second point of electric bridge comprises the second test channel.
4. according to the speed pickup of at least one in claims 1 to 3, it is characterized in that, this test circuit is designed to especially just can cause the switching from normal operation mode to test mode of operation by means of only the test mode signal of outside, and especially keeps normal operation mode or switching to get back to normal operation mode when there is not test mode signal.
5. according to the speed pickup of at least one in Claims 1-4, it is characterized in that, described test circuit is formed like this, namely, this test circuit in order to switch the electric switch at least having and be especially designed to semiconductor switch between normal operation mode and test mode of operation, wherein, this at least one switch is designed to programmable worthily and/or provides described test mode signal by programming.
6., according to the speed pickup of at least one in claim 1 to 5, it is characterized in that, this test circuit is designed to understand test mode signal independently and is independently switched in corresponding mode of operation according to described test mode signal.
7. according to the speed pickup of claim 5 or 6, it is characterized in that, described speed pickup at least has the first and second electric switches, wherein, this first switch so forms and is connected, described first switch is made substantially to provide the output signal of first point of electric bridge in the normal operating mode directly to signal processing circuit, and in test mode the output signal of this first point of electric bridge is supplied to the first test channel of test circuit, wherein, this first test channel is connected with signal processing circuit at outgoing side, and wherein, especially second switch so forms and is connected, described second switch is made substantially to provide the output signal of second point of electric bridge in the normal operating mode directly to signal processing circuit, and in test mode the output signal of second point of electric bridge is supplied to the second test channel of test circuit, wherein, this second test channel is connected with signal processing circuit at outgoing side.
8. according to the speed pickup of at least one in claim 1 to 7, it is characterized in that, this test circuit to be designed at least one output signal or several output signal of at least one magnetic field sensing element under test mode of operation:
-by means of at least one time-lag network, especially programmable time-lag network postpones the retardation time of a regulation, and/or
-carry out amplifying or decaying with the amplification coefficient/attenuation coefficient of a regulation by means of at least one especially programmable amplification or attenuator circuit, and/or
-reverse by means of at least one negative circuit and/or voltage inverter, and/or
-alternately interrupt with having beat or transmission by means of the generator and/or oscillator driving control one on-off element;
Afterwards described output signal be transported to signal processing circuit and/or be supplied to signal processing circuit, wherein, especially at least the first and/or second test channel is designed to the output signal affecting at least the first and/or second point of electric bridge by this way.
9. speed pickup according to claim 8, it is characterized in that, test circuit, especially at least the first and/or second test channel is designed to make by means of the delay of at least one time-lag network at least one output signal of at least one magnetic field sensing element or the delayed selection culture to the output signal of first or second point of electric bridge of magnetic field sensing element or be defined as large like this, and this signal is not considered when checking by means of check circuit in signal processing circuit.
10. according to the speed pickup of at least one in claim 1 to 9, it is characterized in that, this signal processing circuit is designed at least have the check circuit so formed, described check circuit can between two or more signal, especially carry out confidence level test between the signal being directly supplied to signal processing circuit at the signal of the output signal tested person circuit impact of point electric bridge respectively as magnetic field sensing element or the impact of non-tested person circuit and/or compare, wherein, check circuit carries out confidence level test and/or compares in signal amplitude and/or signal frequency.
11. speed pickups according to claim 10, it is characterized in that, the check circuit of this signal processing circuit be designed to from confidence level test and/or relatively obtain the information of the Functional Capability about at least one magnetic field sensing element and/or test circuit and/or signal processing circuit, and especially in the output signal of speed pickup, provide described information.
The speed pickup of at least one in 12. according to Claim 8 to 11, is characterized in that, described test circuit is designed at least one generator and/or oscillator are run with the assigned frequency between 0Hz to 2500Hz.
13. according to the speed pickup of at least one in claim 1 to 12, it is characterized in that, this test circuit is designed to make at least one generator and/or oscillator drive control one or two or more current sources or voltage source particularly by least one electrical switch element, wherein, especially when described current source or voltage source pass through the switch activator arranged, this at least one current source or voltage source produce the electrical testing source signal of a regulation, and when described current source or voltage source pass through the switch deactivation arranged, do not produce test source signal, wherein, this test source signal in test circuit and/or in signal processing circuit with at least one another Signal averaging, this test source signal is especially evaluated and/or then carry out confidence level test with at least one another signal and/or compare, or
Wherein, this test source signal directly carries out confidence level test with at least one another signal and/or compares in test circuit and/or signal processing circuit.
14. speed pickups according to claim 13, it is characterized in that, this test circuit and/or signal processing circuit are designed to, even if when magnetic field sensing element detects the magnetic field of magnetic field intensity substantial constant, also at least one current source of control or voltage source generation alternating signal can be driven by generator and/or oscillator.
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| Application Number | Priority Date | Filing Date | Title |
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| DE102014007489 | 2014-05-23 | ||
| DE102014007490.0 | 2014-05-23 | ||
| DE102014007490 | 2014-05-23 | ||
| DE102014007489.7 | 2014-05-23 | ||
| DE102015209447.2 | 2015-05-22 | ||
| DE102015209447.2A DE102015209447A1 (en) | 2014-05-23 | 2015-05-22 | Static testable wheel speed sensor |
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| CN105301277A true CN105301277A (en) | 2016-02-03 |
| CN105301277B CN105301277B (en) | 2020-01-03 |
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| CN201510386230.0A Active CN105301277B (en) | 2014-05-23 | 2015-05-25 | Wheel speed sensor capable of static test |
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| DE (1) | DE102015209447A1 (en) |
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| DE102019218730A1 (en) * | 2019-12-03 | 2021-06-10 | Zf Friedrichshafen Ag | Detection device for detecting rotational movement information of a rotating component of a motor vehicle |
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Also Published As
| Publication number | Publication date |
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| CN105301277B (en) | 2020-01-03 |
| DE102015209447A1 (en) | 2015-11-26 |
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