CN203422057U - Car window motor position detection circuit - Google Patents
Car window motor position detection circuit Download PDFInfo
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- CN203422057U CN203422057U CN201320466783.3U CN201320466783U CN203422057U CN 203422057 U CN203422057 U CN 203422057U CN 201320466783 U CN201320466783 U CN 201320466783U CN 203422057 U CN203422057 U CN 203422057U
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- 238000001514 detection method Methods 0.000 title claims abstract description 26
- 238000005070 sampling Methods 0.000 claims abstract description 24
- 238000007493 shaping process Methods 0.000 claims abstract description 23
- 238000001914 filtration Methods 0.000 claims abstract description 9
- 230000003321 amplification Effects 0.000 claims abstract description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 4
- 239000003990 capacitor Substances 0.000 claims description 14
- 238000004364 calculation method Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
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Abstract
The utility model provides a car window motor position detection circuit. The car window motor position detection circuit comprises: a sampling circuit whose input end is connected with a motor for acquiring the alternating-current component of the motor voltage; an amplifying circuit for performing amplification on the alternating-current component; a filtering circuit for performing filtering on the alternating-current component which is amplified by the amplifying circuit; and a shaping output circuit for performing shaping on the alternating-current component filtered by the filtering circuit, wherein the output end of the shaping output circuit is used to output a pulse waveform of the motor voltage alternating-current component, and the pulse waveform is used in the calculation of motor position detection. According to the utility model, by acquiring the motor voltage alternating-current component and performing amplification, filtering and shaping operations, the pulse waveform of the alternating-current component is obtained, corresponding calculation operation is performed on the pulse waveform through a control circuit, so that the position of the car window motor can be acquired through the number of rotation turns of the motor without adopting a special position sensor, so the sensor and corresponding wiring harness cost and the car overall cost can be reduced.
Description
Technical Field
The utility model relates to an automobile window motor position detection area.
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.
SUMMERY OF THE UTILITY MODEL
An object of the embodiment of the utility model is to provide a car window motor position detection circuit realizes car window motor position detection with the low cost.
An automobile window motor position detection circuit, comprising:
the input end of the sampling circuit is connected with the motor and is used for collecting the alternating current component of the motor voltage;
an amplifying circuit for amplifying the alternating current component;
a filter circuit for filtering the alternating current component amplified by the amplifying 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 sampling circuit is connected with the amplifying circuit, the filter circuit and the shaping output circuit in sequence.
Preferably, the 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 sampling circuit and is connected with the motor;
the other end of the first capacitor is used as the output end of the sampling circuit;
the other end of the first resistor is grounded.
Preferably, the 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 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 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 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.
The embodiment of the utility model provides a pair of automobile window motor position detection circuit through sampling motor voltage alternating current component, through the processing of enlarging, filtering and plastic, finally obtains alternating current component's pulse waveform carries out corresponding calculation to this pulse waveform by control circuit and handles, just can learn the position of automobile 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.
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 of a window motor of an automobile according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a detection circuit for detecting a position of a window motor of an automobile according to 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 detection circuit 1, which includes a sampling circuit 10, an amplifying circuit 11, a filter circuit 12, and a shaping output circuit 13. The input end of the sampling circuit 10 is connected with the motor 2 and used for collecting the alternating current component of the voltage of the motor 2; the output end of the sampling circuit 10 is connected with the amplifying circuit 11, the filter circuit 12 and the shaping output circuit 13 in sequence; the amplifying circuit 11 is used for amplifying the alternating current component; the filter circuit 12 is configured to filter the ac component amplified by the amplifier circuit 11; the output end of the shaping output circuit 13 outputs a pulse waveform of the alternating-current component of the voltage of the motor 2, and the pulse waveform is input to the control circuit 3 for calculation of motor position detection.
In one embodiment, the control circuit 3 may be composed of a single chip microcomputer and peripheral circuits thereof.
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 detection circuit, through sampling 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.
Specifically, referring to fig. 2, fig. 2 is a schematic diagram illustrating a detection circuit for detecting a position of a window motor of an automobile according to an embodiment of the present invention. Wherein,
the sampling circuit 10 comprises a first capacitor C1 and a first resistor R1; the amplifying 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 includes a second amplifier U2, a fifth resistor R5, and a sixth resistor R6.
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 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 the U2 is used as the input end of the shaping output circuit 13, the negative input end of the U2 is connected with the output end of the U2 through R5, the output end of the 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 the U2 is grounded through R6.
In the present embodiment, the operation principle of the automobile window 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.
To sum up, the embodiment of the utility model provides a pair of car window motor position detection circuitry, through sampling to 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 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.
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 (5)
1. An automobile window motor position detection circuit, comprising:
the input end of the sampling circuit is connected with the motor and is used for collecting the alternating current component of the motor voltage;
an amplifying circuit for amplifying the alternating current component;
a filter circuit for filtering the alternating current component amplified by the amplifying 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 sampling circuit is connected with the amplifying circuit, the filter circuit and the shaping output circuit in sequence.
2. The automotive window motor position detection circuit of claim 1, wherein the 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 sampling circuit and is connected with the motor;
the other end of the first capacitor is used as the output end of the sampling circuit;
the other end of the first resistor is grounded.
3. The automotive window motor position detection circuit according to claim 1, characterized in that the amplification circuit includes 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 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 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 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 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 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320466783.3U CN203422057U (en) | 2013-08-01 | 2013-08-01 | Car window motor position detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320466783.3U CN203422057U (en) | 2013-08-01 | 2013-08-01 | Car window motor position detection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN203422057U true CN203422057U (en) | 2014-02-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320466783.3U Expired - Lifetime CN203422057U (en) | 2013-08-01 | 2013-08-01 | Car window motor position detection circuit |
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| CN (1) | CN203422057U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104197964A (en) * | 2014-08-26 | 2014-12-10 | 宁波双林汽车部件股份有限公司 | Current waveform/rectangular pulse conversion circuit device |
-
2013
- 2013-08-01 CN CN201320466783.3U patent/CN203422057U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104197964A (en) * | 2014-08-26 | 2014-12-10 | 宁波双林汽车部件股份有限公司 | Current waveform/rectangular pulse conversion circuit device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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 |