CN203422454U - Car window motor position and failure detection circuit - Google Patents
Car window motor position and failure detection circuit Download PDFInfo
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- CN203422454U CN203422454U CN201320465557.3U CN201320465557U CN203422454U CN 203422454 U CN203422454 U CN 203422454U CN 201320465557 U CN201320465557 U CN 201320465557U CN 203422454 U CN203422454 U CN 203422454U
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- 238000001514 detection method Methods 0.000 title claims abstract description 54
- 238000005070 sampling Methods 0.000 claims abstract description 36
- 238000007493 shaping process Methods 0.000 claims abstract description 21
- 238000001914 filtration Methods 0.000 claims abstract description 6
- 239000003990 capacitor Substances 0.000 claims description 16
- 230000003321 amplification Effects 0.000 claims description 7
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 239000005357 flat glass Substances 0.000 description 2
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- 238000012986 modification Methods 0.000 description 1
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Abstract
The utility model provides a car window motor position and failure detection circuit. The car window motor position and failure detection circuit comprises a position detection circuit and a failure detection circuit. The position detection circuit comprises an alternating-current sampling circuit, a first amplifying circuit, a filtering circuit and a shaping output circuit which are connected successively. The input end of the alternating-current sampling circuit is connected with a motor for acquiring the alternating-current component of the motor voltage. The output end of the shaping output circuit is used to output a pulse waveform of the motor voltage alternating-current component, wherein the pulse waveform is used in the calculation of motor position detection. The failure detection circuit comprises a direct-current sampling circuit and a second amplifying circuit which are connected successively. The input end of the direct-current sampling circuit is connected with the motor for acquiring the direct-current component of the motor voltage. The output end of the second amplifying circuit is used to output an amplified motor voltage direct-current component which is used in the judgment of motor failure detection. According to the utility model, through the acquisition of the alternating-current component and the direct-current component of the motor voltage, motor position and failure detection can be realized without a sensor.
Description
Technical Field
The utility model relates to an automobile window motor position and fault detection field.
Background
With the widespread use of electronic technology in the automotive field, a large number of automobiles employ an electric system, for example, a motor to control the automatic raising and closing of an automobile window, thereby improving the riding comfort. However, in the process of automatically lifting the window, if the window is operated by mistake, the automobile window has the potential risks of being stuck, squeezed and injuring people. Therefore, regulations in various countries have stipulated the anti-pinch of automobile windows. In the anti-pinch algorithm of the automobile window, the motor running position of the automobile window is required to be acquired.
In the prior art, the motor operation position of the automobile window is generally detected by adding a position sensor at the motor or the automobile window, which increases the cost of the sensor and the wire harness, and the whole cost and failure rate of the automobile.
In addition, the conventional motor failure detection for the vehicle window is only based on current detection, and when a motor is blocked, overheating occurs, resistance increases, or a motor short circuit or other failures occur, the motor failure cannot be detected.
SUMMERY OF THE UTILITY MODEL
An object of the embodiment of the utility model is to provide a car window motor position and fault detection circuit realizes car window motor position with the low cost and detects, solves the problem that can not detect out motor trouble when motor stalling or short circuit simultaneously.
An automotive window motor position and fault detection circuit comprising: a position detection circuit and a fault detection circuit; wherein,
the position detection circuit includes:
the input end of the alternating current sampling circuit is connected with the motor and is used for collecting alternating current components of the motor voltage;
a first amplifying circuit for amplifying the alternating current component;
a filter circuit for filtering the alternating current component amplified by the first amplification circuit; and
a shaping output circuit for shaping the alternating current component filtered by the filter circuit, wherein the output end of the shaping output circuit outputs the pulse waveform of the alternating current component of the motor voltage, and the pulse waveform is used for calculating the motor position detection;
the alternating current sampling circuit is sequentially connected with the first amplifying circuit, the filter circuit and the shaping output circuit;
the fault detection circuit includes:
the direct current sampling circuit and the second amplifying circuit;
the input end of the direct current sampling circuit is connected with the motor and used for collecting the direct current component of the motor voltage;
the output end of the direct current sampling circuit is connected with the input end of the second amplifying circuit;
and the output end of the second amplifying circuit outputs the amplified direct current component of the motor voltage for judging the motor fault detection.
Preferably, the alternating current sampling circuit comprises a first capacitor and a first resistor;
the first capacitor is connected with the first resistor, and a connecting end is used as an input end of the alternating current sampling circuit and is connected with the motor;
the other end of the first capacitor is used as the output end of the alternating current sampling circuit;
the other end of the first resistor is grounded.
Preferably, the first amplifying circuit comprises a first amplifier, a second resistor and a third resistor;
the positive input end of the first amplifier is connected with the output end of the alternating current sampling circuit, the negative input end of the first amplifier is grounded through a third resistor, and the output end of the first amplifier is used as the output end of the first amplifying circuit;
one end of the second resistor is connected with the negative input end of the first amplifier, and the other end of the second resistor is connected with the output end of the first amplifier.
Preferably, the filter circuit comprises a fourth resistor and a second capacitor;
one end of the fourth resistor is connected with the output end of the first amplifying circuit, and the other end of the fourth resistor is grounded through a second capacitor;
and the connection end of the fourth resistor and the second capacitor is used as the output end of the filter circuit.
Preferably, the shaping output circuit comprises a second amplifier, a fifth resistor and a sixth resistor;
the positive input end of the second amplifier is connected with the output end of the filter circuit, the negative input end of the second amplifier is grounded through a sixth resistor, and the output end of the second amplifier is used as the output end of the shaping output circuit;
one end of the fifth resistor is connected with the negative input end of the first amplifier, and the other end of the fifth resistor is connected with the output end of the second amplifier.
Preferably, the dc sampling circuit includes the first resistor;
the second amplifying circuit comprises a third amplifier, a seventh resistor and an eighth resistor;
the positive input end of the third amplifier is connected with the connecting end of the first resistor and the first capacitor, the negative input end of the third amplifier is grounded through the eighth resistor, and the output end of the third amplifier is used as the output end of the second amplifying circuit;
one end of the seventh resistor is connected with the negative input end of the third amplifier, and the other end of the seventh resistor is connected with the output end of the third amplifier.
The embodiment of the utility model provides a pair of car window motor position and fault detection circuit, through the collection to motor voltage alternating current component to through the processing of enlarging, filtering and plastic, finally obtain the pulse waveform of alternating current component carries out corresponding calculation to this pulse waveform by control circuit and handles, just can learn the position of car window motor through the number of turns of motor rotation, and need not to adopt special position sensor to realize, has reduced the expense and the whole cost of vehicle of sensor and corresponding pencil, thereby realizes the detection of car window motor position with the low cost. Meanwhile, through the collection of the direct current component of the voltage of the motor, the control circuit is combined with the direct current component and the calculated pulse frequency corresponding to the minimum rotating speed of the motor in operation to comprehensively judge whether the motor has faults or not, and can judge whether the motor has faults such as locked rotor or short circuit and the like, thereby solving the problem that the fault of the motor cannot be detected when the motor is locked rotor or short circuit.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a block diagram of a circuit for detecting a position and a fault of a window motor of an automobile according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a motor position and fault detection circuit for an automobile window provided in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, an embodiment of the present invention provides an automobile window motor position and fault detection circuit, including a position detection circuit 1, a fault detection circuit 2, a motor 3 and a control circuit 4.
The position detection circuit 1 includes an ac sampling circuit 10, a first amplifier circuit 11, a filter circuit 12, and a shaping output circuit 13. The input end of the alternating current sampling circuit 10 is connected with the motor 3 and used for collecting the alternating current component of the motor voltage; the output end of the alternating current sampling circuit 10 is connected with the first amplifying circuit 11, the filter circuit 12 and the shaping output circuit 13 in sequence; the output of the shaping output circuit 13 outputs a pulse waveform of the alternating current component of the motor voltage, which is input to the control circuit 4 for calculation of motor position detection.
The failure detection circuit 2 includes a dc sampling circuit 20 and a second amplification circuit 21. The input end of the direct current sampling circuit 20 is connected with the motor 3 and used for collecting the direct current component of the motor voltage; the output end of the direct current sampling circuit 20 is connected with the input end of the second amplifying circuit 21; the output terminal of the second amplifier circuit 21 outputs the amplified dc component of the motor voltage, which is input to the control circuit 4 for determination of motor failure detection.
In one embodiment, the control circuit 4 may be composed of a single chip and its peripheral circuits.
Generally, automobile window lifters are driven by a brushed dc motor having a phase converter. When the motor rotates, the motor coil is switched with the power supply through the phase converter. Since the coil is an inductive element, a back electromotive force is generated every time the coil is switched with a power supply, and an ac signal is formed and superimposed on both ends of the power supply. Since the number of coil sets of the selected brushed dc motor is fixed (assuming 3 sets), the motor will be phase-shifted 3 times per revolution. The number of turns of the motor can be judged by collecting the alternating current signals. The travel of the same vehicle window from the top end to the bottom end is fixed, and the number of motor revolutions of the vehicle window from the top end to the bottom end is also fixed, so that by counting the number of motor revolutions, it can be known at which position the vehicle window is from the top end to the bottom end. And the alternating component of the motor voltage can be used for collecting the number of turns of the motor.
Therefore, the embodiment of the utility model provides a pair of car window motor position and fault detection circuit, through adopting motor voltage alternating current component, through the processing of enlarging, filtering and plastic, finally obtain the pulse waveform of alternating current component carries out corresponding calculation to this pulse waveform by control circuit and handles, just can learn the position of car window through the number of turns of motor rotation, and need not to adopt special position sensor to realize, has reduced the expense and the whole cost of vehicle of sensor and corresponding pencil. In addition, the motor voltage direct current component is collected and amplified and input to the control circuit, and the control circuit judges whether the motor has faults or not according to the alternating current component and the direct current component together, so that the problem that the motor faults cannot be detected when the motor is in a locked rotor state or a short circuit state is solved.
Specifically, please refer to fig. 2, fig. 2 shows a schematic diagram of a motor position and fault detection circuit for an automobile window according to an embodiment of the present invention. Wherein,
the alternating current sampling circuit 10 comprises a first capacitor C1 and a first resistor R1; the first amplification circuit 11 includes a first amplifier U1, a second resistor R2, and a third resistor R3; the filter circuit 12 comprises a fourth resistor R4 and a second capacitor C2; the shaping output circuit 13 comprises a second amplifier U2, a fifth resistor R5 and a sixth resistor R6; the first resistor R1 forms a direct current sampling circuit 20; the second amplification circuit 21 includes a third amplifier U3, a seventh resistor, and an eighth resistor.
Specifically, one end of the C1 is connected with one end of the R1, the other end of the R1 is grounded, the other end of the C1 is connected with the forward input end of the U1 as the output end of the ac sampling circuit 10, and the common end of the C1 and the R1 is connected with the power supply VB through the motor M;
the positive input end of the U1 is used as the input end of the amplifying circuit 11, the negative input end of the U1 is connected with the output end of the U1 through R2, the output end of the U1 is used as the output end of the amplifying circuit 11, and the negative input end of the U1 is grounded through R3;
one end of R4 is used as the input end of the filter circuit 12 and is connected with the output end of U1, the other end of R4 is grounded through C2, and the common end of R4 and C2 is used as the output end of the filter circuit 12 and is connected with the positive input end of U2;
the positive input end of U2 is used as the input end of the shaping output circuit 13, the negative input end of U2 is connected with the output end of U2 through R5, the output end of U2 is used as the output end of the shaping output circuit 13, namely the output end of the automobile window motor position detection circuit, and the negative input end of U2 is grounded through R6;
the positive input end of the U3 is connected with the connection end of the R1 and the C1, the negative input end is grounded through the R8, one end of the R7 is connected with the negative input end of the U3, the other end of the R7 is connected with the output end of the U3, and the output end of the U3 is the output end of the second amplifying circuit 21.
In the present embodiment, the operation principle of the motor position detection circuit is as follows:
motor M upper end is connected to power VB, and the lower extreme is sampled through the voltage at sampling resistance R1 both ends, and sampling voltage contains two kinds of components of alternating current-direct current, and wherein the alternating current component can be used for the collection of the rotatory number of turns of motor M. The alternating current component carries out DC blocking processing on the sampling voltage of the R1 through the C1, the extracted alternating current signal enters an amplifying circuit consisting of U1, R2 and R3 to be amplified, and the specific amplification factor can be adjusted according to different motors. The amplified signal is filtered by a low pass filter consisting of R4 and C2 to remove unwanted high frequency interference signals. The filtered signals enter a shaping output circuit consisting of U2, R5 and R6 to be shaped into pulse waveforms, the pulse waveforms are input to a control circuit to be used for calculating the position detection of the motor, and the position of the automobile window can be known by the control circuit through measuring the number of pulses and the pulse frequency.
In the present embodiment, the principle of the determination of the motor failure detection is as follows:
and if the total stroke of the vehicle window glass is S and the total pulse number is N, the stroke corresponding to each pulse is S divided by N. And setting the motor running current as Ia, the motor locked-rotor current Imax and the motor no-load current Imin. The pulse frequency corresponding to the minimum rotating speed of the motor is Fmin.
If the motor is in the locked-rotor area, judging that the motor is locked-rotor when the motor current is greater than or equal to Imax or the pulse frequency is less than Fmin;
if the motor current is not in the locked rotor area, judging that the load is short-circuited when the motor current is larger than or equal to Imax or the pulse frequency is smaller than Fmin;
when the current of the motor is smaller than Imin or the pulse frequency is smaller than Fmin, judging that the motor is open-circuited;
when the motor current is Ia and the pulse frequency is less than Fmin, judging whether the motor is overheated or the load is short-circuited;
when the motor current is Ia and the pulse frequency is greater than Fmin, the position of the window glass can be calculated.
It should be noted that, regarding the determination of the motor fault detection, the determination is only described as an embodiment, but not limited to the above, and the related art may select the determination according to the needs.
To sum up, the embodiment of the utility model provides a pair of automobile window motor position and fault detection circuit through the collection to motor voltage alternating current component to through the processing of enlarging, filtering and plastic, finally obtain the pulse waveform of alternating current component carries out corresponding calculation to this pulse waveform by control circuit and handles, just can learn the position of automobile window motor through the rotatory number of turns of motor, and need not to adopt special position sensor to realize, has reduced the expense and the whole cost of vehicle of sensor and corresponding pencil, thereby realizes automobile window motor position detection with the low cost. And simultaneously, the embodiment of the utility model provides a pair of car window motor position and fault detection circuit, through the collection to motor voltage direct current component, by the pulse frequency that control circuit combines this direct current component and the minimum rotational speed of the motor operation that calculates to correspond, whether comprehensive judgement motor breaks down to can judge whether stifled trouble such as commentaries on classics or short circuit of motor, thereby solve the problem that can not detect out motor trouble when motor stifled commentaries on classics or short circuit.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
Finally, it should also be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. An automotive window motor position and fault detection circuit, comprising: a position detection circuit and a fault detection circuit; wherein,
the position detection circuit includes:
the input end of the alternating current sampling circuit is connected with the motor and is used for collecting alternating current components of the motor voltage;
a first amplifying circuit for amplifying the alternating current component;
a filter circuit for filtering the alternating current component amplified by the first amplification circuit; and
a shaping output circuit for shaping the alternating current component filtered by the filter circuit, wherein the output end of the shaping output circuit outputs the pulse waveform of the alternating current component of the motor voltage, and the pulse waveform is used for calculating the motor position detection;
the alternating current sampling circuit is sequentially connected with the first amplifying circuit, the filter circuit and the shaping output circuit;
the fault detection circuit includes:
the direct current sampling circuit and the second amplifying circuit;
the input end of the direct current sampling circuit is connected with the motor and used for collecting the direct current component of the motor voltage;
the output end of the direct current sampling circuit is connected with the input end of the second amplifying circuit;
and the output end of the second amplifying circuit outputs the amplified direct current component of the motor voltage for judging the motor fault detection.
2. The automotive window motor position and fault detection circuit of claim 1, wherein the ac sampling circuit comprises a first capacitor, a first resistor;
the first capacitor is connected with the first resistor, and a connecting end is used as an input end of the alternating current sampling circuit and is connected with the motor;
the other end of the first capacitor is used as the output end of the alternating current sampling circuit;
the other end of the first resistor is grounded.
3. The automotive window motor position and fault detection circuit of claim 1, wherein the first amplification circuit comprises a first amplifier, a second resistor, a third resistor;
the positive input end of the first amplifier is connected with the output end of the alternating current sampling circuit, the negative input end of the first amplifier is grounded through a third resistor, and the output end of the first amplifier is used as the output end of the first amplifying circuit;
one end of the second resistor is connected with the negative input end of the first amplifier, and the other end of the second resistor is connected with the output end of the first amplifier.
4. The automotive window motor position and fault detection circuit of claim 1, wherein the filter circuit includes a fourth resistor and a second capacitor;
one end of the fourth resistor is connected with the output end of the first amplifying circuit, and the other end of the fourth resistor is grounded through a second capacitor;
and the connection end of the fourth resistor and the second capacitor is used as the output end of the filter circuit.
5. The automotive window motor position and fault detection circuit of claim 1, wherein the shaping output circuit includes a second amplifier, a fifth resistor, a sixth resistor;
the positive input end of the second amplifier is connected with the output end of the filter circuit, the negative input end of the second amplifier is grounded through a sixth resistor, and the output end of the second amplifier is used as the output end of the shaping output circuit;
one end of the fifth resistor is connected with the negative input end of the first amplifier, and the other end of the fifth resistor is connected with the output end of the second amplifier.
6. The automotive window motor position and failure detection circuit of claim 2,
the direct current sampling circuit comprises the first resistor;
the second amplifying circuit comprises a third amplifier, a seventh resistor and an eighth resistor;
the positive input end of the third amplifier is connected with the connecting end of the first resistor and the first capacitor, the negative input end of the third amplifier is grounded through the eighth resistor, and the output end of the third amplifier is used as the output end of the second amplifying circuit;
one end of the seventh resistor is connected with the negative input end of the third amplifier, and the other end of the seventh resistor is connected with the output end of the third amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320465557.3U CN203422454U (en) | 2013-08-01 | 2013-08-01 | Car window motor position and failure detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320465557.3U CN203422454U (en) | 2013-08-01 | 2013-08-01 | Car window motor position and failure detection circuit |
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| Publication Number | Publication Date |
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| CN203422454U true CN203422454U (en) | 2014-02-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320465557.3U Expired - Lifetime CN203422454U (en) | 2013-08-01 | 2013-08-01 | Car window motor position and failure detection circuit |
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| CN (1) | CN203422454U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104834300A (en) * | 2014-10-23 | 2015-08-12 | 北汽福田汽车股份有限公司 | Vehicle window clamping stagnation fault monitoring method and system |
-
2013
- 2013-08-01 CN CN201320465557.3U patent/CN203422454U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104834300A (en) * | 2014-10-23 | 2015-08-12 | 北汽福田汽车股份有限公司 | Vehicle window clamping stagnation fault monitoring method and system |
| CN104834300B (en) * | 2014-10-23 | 2018-01-19 | 北汽福田汽车股份有限公司 | Automotive window Block failure monitoring method and system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 4 / F, building 1, No.14 Jiuxianqiao Road, Chaoyang District, Beijing 100020 Patentee after: Beijing Jingwei Hirain Technologies Co.,Inc. Address before: B1 / F, Northern Territory, Dongsheng Science Park, 66 xixiaokou Road, Haidian District, Beijing 100192 Patentee before: Beijing Jingwei HiRain Technologies Co.,Ltd. |
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| CP03 | Change of name, title or address | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140205 |
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| CX01 | Expiry of patent term |