CN116022236B - Steering wheel is from hand detecting system - Google Patents
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- CN116022236B CN116022236B CN202211193548.3A CN202211193548A CN116022236B CN 116022236 B CN116022236 B CN 116022236B CN 202211193548 A CN202211193548 A CN 202211193548A CN 116022236 B CN116022236 B CN 116022236B
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Abstract
The application relates to the field of automobile steering wheels, and discloses a steering wheel hand-off detection system which can determine whether a steering wheel is off hand according to a value or change of a value of voltage. The system comprises: an alternating current source configured to output an alternating current of a constant current magnitude at a first frequency; a first electrode layer and a second electrode layer; a detection circuit configured to detect a voltage of a first frequency, two input terminals of the detection circuit being coupled to two output terminals of an alternating current source, respectively; two output ends of the alternating current source are respectively coupled to the first electrode layer and the second electrode layer; at least one of the first electrode layer and the second electrode layer is disposed on the steering wheel; when a hand holds the steering wheel, an alternating current source, a first electrode layer, a human body and a second electrode layer form an alternating current loop; when the hand leaves the steering wheel, the ac circuit is disconnected.
Description
Technical Field
The application relates to the field of automobile steering wheels, in particular to a steering wheel hand-off detection system.
Background
This section is intended to provide a background or context to the embodiments of the application that are recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.
After the generation of the L2 and above assisted driving technologies, there is always an individual driver who considers it as an "automatic driving technology" and eventually causes an accident to occur, at this time, the detection of the steering wheel from the hands is important, and it will give a warning in time after the driver is excessively relaxed or even releases both hands from the steering wheel, so that the driver takes over the vehicle again.
Conventional HOD detection (Hands Off Detection) is implemented using torque detection, pressure detection, etc.
Torque detection is determined by measuring the moment applied by the driver on the steering wheel, however, on long straight roads, the driver does not need to turn the steering wheel frequently, a large number of false alarms will be generated at this time, the delay time of determination has to be lengthened in order to improve the driving experience, however, this cannot completely solve the problem, which results in that the mode has response delay and cannot be determined normally under the long straight road condition.
Pressure detection is to embed strain gages under steering wheel fabric to know whether an object is gripped, however, the mode is relatively easy to deceive, and a vehicle machine can hardly distinguish a recognition result between a hand grip and other pressures only by applying certain pressure (such as elastic bands, rubber bands and other life articles) on a specific position of a steering wheel.
Disclosure of Invention
The application aims to provide a steering wheel hand-off detection system which can accurately identify whether a steering wheel is off hand.
The application discloses a steering wheel hand-off detection system, which comprises:
an alternating current source configured to output an alternating current of a constant current magnitude at a first frequency;
A first electrode layer and a second electrode layer;
a detection circuit configured to detect a voltage of the first frequency, two inputs of the detection circuit being coupled to two outputs of the alternating current source, respectively;
Two output ends of the alternating current source are respectively coupled to the first electrode layer and the second electrode layer; at least one of the first electrode layer and the second electrode layer is configured on a steering wheel; when a hand holds the steering wheel, the alternating current source, the first electrode layer, the human body and the second electrode layer form an alternating current loop; when the human hand leaves the steering wheel, the ac circuit is disconnected.
In a preferred embodiment, it is determined whether the steering wheel is out of the hand based on the value or change in value of the voltage detected by the detection circuit.
In a preferred embodiment, the first electrode layer is arranged on the upper half of the steering wheel; the second electrode layer is disposed on a lower half of the steering wheel.
In a preferred embodiment, the first electrode layer is arranged on a steering wheel; the second electrode layer is arranged on the backrest and/or the cushion of the seat.
In a preferred embodiment, the detection circuit further comprises:
The two input ends of the analog-to-digital conversion circuit are respectively coupled to the two output ends of the alternating current source;
And an IQ demodulation unit, the input end of which is coupled with the output end of the analog-to-digital conversion circuit, is configured to perform IQ demodulation on the input voltage signal so as to obtain the strength of the signal of the first frequency.
In a preferred embodiment, the detection circuit further comprises:
The two input ends of the analog-to-digital conversion circuit are respectively coupled to the two output ends of the alternating current source;
And a bandpass filter having an input coupled to the output of the analog-to-digital conversion circuit and configured to bandpass filter the input voltage signal centered at the first frequency for further measuring the strength of the signal at the first frequency.
In a preferred embodiment, the detection circuit further comprises:
The two input ends of the analog-to-digital conversion circuit are respectively coupled to the two output ends of the alternating current source;
and the FFT module is configured to convert the time domain voltage signal output by the analog-to-digital conversion circuit into a frequency domain signal through fast Fourier transform and output the intensity of the first frequency in the frequency domain.
In a preferred embodiment, the first electrode layer and the second electrode layer are formed of a conductive skin or a conductive fabric.
In a preferred embodiment, the steering wheel is divided into N regions, and the system includes N ac current sources of different output frequencies, N first electrode layers, N second electrode layers, and N detection circuits;
The upper half of each region is provided with one first electrode layer, and the lower half of each region is provided with one second electrode layer;
Each region corresponds to one detection circuit and one alternating current source, and two output ends of the alternating current source are respectively coupled to a first electrode layer and a second electrode layer corresponding to the region; the detection circuit is configured to detect a voltage of a frequency corresponding to the alternating current source, and two input ends of the detection circuit are respectively coupled to two output ends of the alternating current source; when a hand holds the steering wheel in the area, the alternating current source, the first electrode layer, the human body and the second electrode layer form an alternating current loop; when a human hand leaves the area, the alternating current loop is disconnected;
and determining the position of the hand on the steering wheel by combining the values or the changes of the values of the voltages detected by the N detection circuits.
In a preferred embodiment, the steering wheel is divided into N regions, including N alternating current sources of different output frequencies, N first electrode layers,
A second electrode layer disposed on the backrest and/or the seat cushion of the seat;
and a detection circuit configured to detect the intensities of the signals of the N different output frequencies to determine the location of the human hand on the steering wheel.
In the embodiment of the application, the alternating current source outputs alternating current with constant magnitude, and the human body, the alternating current source, the first electrode layer and the second electrode layer form an alternating current loop, so that accurate detection can be performed only by contacting a human hand with the steering wheel to enable the alternating current loop to be communicated.
Further, one electrode layer can be configured on the steering wheel, the other electrode layer can be configured on the backrest and/or the cushion of the seat, and the electrode layer with a larger area is arranged on the seat, so that the detection accuracy is improved.
Furthermore, the first electrode layer and the second electrode layer can be arranged on the steering wheel, so that the implementation is easy.
Furthermore, a plurality of areas can be arranged on the steering wheel, the electrode layers and the corresponding current sources are respectively arranged, different current sources have different output frequencies, and according to the detected signal intensity of different frequencies, whether the hand leaves the steering wheel can be judged, and the position of the hand on the steering wheel can be more finely identified.
The technical features disclosed in the above summary, the technical features disclosed in the following embodiments and examples, and the technical features disclosed in the drawings may be freely combined with each other to constitute various novel technical solutions (which should be regarded as having been described in the present specification) unless such a combination of technical features is technically impossible. For example, in one example, feature a+b+c is disclosed, in another example, feature a+b+d+e is disclosed, and features C and D are equivalent technical means that perform the same function, technically only by alternative use, and may not be adopted simultaneously, feature E may be technically combined with feature C, and then the solution of a+b+c+d should not be considered as already described because of technical impossibility, and the solution of a+b+c+e should be considered as already described.
Drawings
Fig. 1 is a schematic structural view of a steering wheel out-of-hand detection system according to an embodiment of the present application.
Fig. 2 is a simplified schematic diagram of a steering wheel off-hand detection system according to one embodiment of the present application.
Fig. 3 is a schematic view of a steering wheel based first electrode layer and a second electrode layer according to one embodiment of the application.
Fig. 4 is a schematic view of a first electrode layer and a second electrode layer based on a seat or a vehicle shell according to one embodiment of the application.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be understood by those skilled in the art that the claimed application may be practiced without these specific details and with various changes and modifications from the embodiments that follow.
Description of the partial concepts:
A band pass filter is a filter that can pass frequency components in a certain frequency range but attenuate frequency components in other ranges to an extremely low level, and is a device that allows waves of a specific frequency band to pass while shielding other frequency bands.
The FFT is an efficient algorithm for DFT, known as fast fourier transform (fast Fourier transform). Fourier transform is one of the most basic methods in time-frequency domain transform analysis.
Quadrature (IQ) demodulation is a demodulation scheme commonly used in communications, and has an effect similar to that of a band-variable band-pass filter, and has the advantages of simple implementation and less calculation amount.
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
A first embodiment of the present application relates to a steering wheel out-of-hand detection system, the complete system configuration of which is shown in fig. 1, the steering wheel out-of-hand detection system comprising: an alternating current source configured to output an alternating current of a constant current magnitude at a first frequency; a first electrode layer and a second electrode layer; and a detection circuit configured to detect the voltage of the first frequency, the two input terminals of the detection circuit being coupled to the two output terminals of the alternating current source, respectively. Fig. 2 is a simplified schematic diagram of the system.
Two output ends of the alternating current source are respectively coupled to the first electrode layer and the second electrode layer; at least one of the first electrode layer and the second electrode layer is disposed on the steering wheel; when a hand holds the steering wheel, an alternating current source, a first electrode layer, a human body and a second electrode layer form an alternating current loop; when the hand leaves the steering wheel, the ac circuit is disconnected. One of the two outputs of the alternating current source is grounded. Whether the steering wheel is out of the hand is determined according to the value or the change of the value of the voltage detected by the detection circuit.
Those skilled in the art will appreciate that there are a variety of implementations of the ac current source, such as by series resistance of the ac voltage source.
The detection circuit may have a variety of implementations.
Optionally, the detection circuit may further include an analog-to-digital conversion circuit (i.e., triangle symbol in fig. 1 or fig. 2), whose two inputs are respectively coupled to two outputs of the ac current source; and an IQ demodulation unit having an input coupled to the output of the analog-to-digital conversion circuit and configured to IQ demodulate the input voltage signal to obtain the strength of the signal at the first frequency.
Optionally, the detection circuit may further include an analog-to-digital conversion circuit, two input terminals of which are respectively coupled to two output terminals of the alternating current source; and a bandpass filter having an input coupled to the output of the analog-to-digital conversion circuit and configured to bandpass filter the input voltage signal centered at the first frequency for further measuring the strength of the signal at the first frequency.
Optionally, the detection circuit may further include an analog-to-digital conversion circuit, two input terminals of which are respectively coupled to two output terminals of the alternating current source; and the FFT module is configured to convert the time domain voltage signal output by the analog-to-digital conversion circuit into a frequency domain signal through fast Fourier transform and output the intensity of the first frequency in the frequency domain.
Optionally, the first electrode layer is configured on the upper half of the steering wheel; the second electrode layer is disposed on the lower half of the steering wheel. Or the first electrode layer is arranged at the lower half part of the steering wheel; the second electrode layer is disposed on the upper half of the steering wheel.
Optionally, the first electrode layer is configured on the steering wheel; the second electrode layer is arranged on the backrest and/or the seat cushion of the seat. Or the first electrode layer is configured on the backrest and/or the cushion of the seat; the second electrode layer is disposed on the steering wheel.
Alternatively, the first electrode layer and the second electrode layer are made of conductive skin or conductive fabric, and may also be made of conductive rubber, conductive paint, conductive adhesive, transparent conductive film, or the like.
The above embodiment includes a set of steering wheel off-hand detection systems, optionally, in another embodiment, N sets of steering wheel off-hand detection systems may be further included, and the specific implementation manner is as follows:
The steering wheel is divided into N areas, and the system comprises N alternating current sources with different output frequencies, N first electrode layers, N second electrode layers and N detection circuits. The upper half of each region is provided with a first electrode layer and the lower half of each region is provided with a second electrode layer. Each region corresponds to a detection circuit and an alternating current source, and two output ends of the alternating current source are respectively coupled to the first electrode layer and the second electrode layer corresponding to the region. The detection circuit is configured to detect a voltage of a frequency corresponding to the ac current source, and two inputs of the detection circuit are coupled to two outputs of the ac current source, respectively. When a human hand holds the steering wheel in the area, the alternating current source, the first electrode layer, the human body and the second electrode layer form an alternating current loop. When the human hand leaves the area, the ac circuit is disconnected. The position of the hand on the steering wheel is determined by integrating the values or the changes of the values of the voltages detected by the N detection circuits.
As shown in fig. 3, the steering wheel is divided into two areas in fig. 3, and the two areas comprise two first electrode layers, two second electrode layers and two alternating current sources, wherein the output frequencies of the two alternating current sources are different, and the two first electrode layers and the two second electrode layers are both positioned on the steering wheel.
Alternatively, in another embodiment, the steering wheel is divided into N regions, including N alternating current sources of different output frequencies, N first electrode layers, and a second electrode layer, the second electrode layers being disposed on the backrest and/or the seat cushion of the seat; and a detection circuit configured to detect the intensities of the signals at the N different output frequencies to determine the location of the human hand on the steering wheel.
As shown in fig. 4, the steering wheel is divided into two areas in fig. 4, and the two areas comprise two first electrode layers, one second electrode layer and two alternating current sources, wherein the output frequencies of the two alternating current sources are different, the two first electrode layers are positioned on the steering wheel, and the second electrode layers are positioned on the backrest and/or the cushion of the seat.
In order to better understand the technical solution of the present application, the following description is given with reference to a specific example, in which details are listed mainly for the purpose of understanding, and are not intended to limit the scope of protection of the present application.
In an actual scenario, an ac current source injects a signal into the first electrode layer, when a human hand approaches or contacts the first electrode layer and the second electrode layer, the signal of the ac current source returns to the second electrode layer through the human hand, the ac current source may alternatively be composed of a voltage source series resistor, and the sampling circuit detects that the amplitude of the ac current source is reduced, that is, the impedance is reduced.
When a human body contacts the first electrode layer and the second electrode layer, a pF-nF level capacitance is generated at the contact interface, as shown in FIG. 1, depending on whether the first electrode layer and the second electrode layer are implanted inside or in surface contact, and returned to the second electrode layer through the human body.
Because the human body is a low-impedance body with the KΩ level in a certain range of frequency, the mode is not limited by the specific position of the second electrode layer, the second electrode layer can be arranged at any position of the vehicle body, and the detected alternating current can be split out as long as the capacitance of the interface between the second electrode layer and the human body is large enough.
In the scheme of the steering wheel, as the distance between the hands and the conductive material on the surface of the steering wheel is quite close, the nF-level capacitor can be easily obtained, environmental changes such as air temperature can be easily covered, or environmental parasitic parameter changes caused by other electrical equipment or other ornaments are installed, and the like, so that extremely strong anti-interference capability and stability are obtained.
In the seating solution, since the surface area of the human body and the relative area of the seat are large enough, the resulting capacitance variation is still sufficient to cover the variation of the ambient parasitic parameters, obtaining a sufficiently high stability and anti-interference capability.
Because the change of the capacitance is larger, the better effect can be achieved by using the alternating current frequency with lower frequency, and because the IQ demodulation is used, the sources of a plurality of frequencies can be easily distinguished by only exciting the first electrode layers at different positions by using different frequencies, so that the fine touch area division is achieved, and the environment interference from the outside can be easily separated, so that the anti-interference capability is further enhanced.
It is noted that in the present disclosure, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, 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" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. In the present application, if it is mentioned that a certain action is performed according to a certain element, it means that the action is performed at least according to the element, and two cases are included: the act is performed solely on the basis of the element and is performed on the basis of the element and other elements. Multiple, etc. expressions include 2, 2 times, 2, and 2 or more, 2 or more times, 2 or more.
This specification includes combinations of the various embodiments described herein. Separate references to embodiments (e.g., "one embodiment" or "some embodiments" or "preferred embodiments") do not necessarily refer to the same embodiment; however, unless indicated as mutually exclusive or as would be apparent to one of skill in the art, the embodiments are not mutually exclusive. It should be noted that the term "or" is used in this specification in a non-exclusive sense unless the context clearly indicates otherwise or requires otherwise.
All references mentioned in this disclosure are to be considered as being included in the disclosure of the application in its entirety so that modifications may be made as necessary. Further, it is understood that various changes and modifications of the application may be made by those skilled in the art after reading the disclosure of the application, and such equivalents are intended to fall within the scope of the application as claimed.
Claims (9)
1. A steering wheel hands-off detection system, comprising:
An alternating current source configured to output an alternating current of constant current magnitude at a first frequency, the system comprising N different output frequencies of the alternating current source;
A second electrode layer and N first electrode layers;
a detection circuit configured to detect a voltage of the first frequency, two inputs of the detection circuit being coupled to two outputs of the alternating current source, respectively;
Two output ends of the alternating current source are respectively coupled to the first electrode layer and the second electrode layer; at least one of the first electrode layer and the second electrode layer is arranged on a steering wheel, the steering wheel is divided into N areas, the upper half part of each area is provided with one first electrode layer, and the lower half part of each area is provided with one second electrode layer; each region corresponds to one detection circuit and one alternating current source, and two output ends of the alternating current source are respectively coupled to a first electrode layer and a second electrode layer corresponding to the region; the detection circuit is configured to detect a voltage of a frequency corresponding to the alternating current source, and two input ends of the detection circuit are respectively coupled to two output ends of the alternating current source; when a hand holds the steering wheel in the area, the alternating current source, the first electrode layer, the human body and the second electrode layer form an alternating current loop; when a human hand leaves the area, the alternating current loop is disconnected;
The position of the hand on the steering wheel is determined by integrating the value or the change of the value of the voltage detected by the detection circuit;
wherein N is more than or equal to 2.
2. The steering wheel out-of-hand detection system of claim 1, wherein whether the steering wheel is out of hand is determined based on a value or a change in a value of the voltage detected by the detection circuit.
3. The steering wheel hands-free detection system of claim 1, wherein the first electrode layer is disposed on an upper half of the steering wheel; the second electrode layer is disposed on a lower half of the steering wheel.
4. The steering wheel hands-free detection system of claim 1, wherein the first electrode layer is disposed on a steering wheel; the second electrode layer is arranged on the backrest and/or the cushion of the seat.
5. The steering wheel out-of-hand detection system of claim 1, wherein the detection circuit further comprises:
The two input ends of the analog-to-digital conversion circuit are respectively coupled to the two output ends of the alternating current source;
And an IQ demodulation unit, the input end of which is coupled with the output end of the analog-to-digital conversion circuit, is configured to perform IQ demodulation on the input voltage signal so as to obtain the strength of the signal of the first frequency.
6. The steering wheel out-of-hand detection system of claim 1, wherein the detection circuit further comprises:
The two input ends of the analog-to-digital conversion circuit are respectively coupled to the two output ends of the alternating current source;
And a bandpass filter having an input coupled to the output of the analog-to-digital conversion circuit and configured to bandpass filter the input voltage signal centered at the first frequency for further measuring the strength of the signal at the first frequency.
7. The steering wheel out-of-hand detection system of claim 1, wherein the detection circuit further comprises:
The two input ends of the analog-to-digital conversion circuit are respectively coupled to the two output ends of the alternating current source;
and the FFT module is configured to convert the time domain voltage signal output by the analog-to-digital conversion circuit into a frequency domain signal through fast Fourier transform and output the intensity of the first frequency in the frequency domain.
8. The steering wheel hands-free detection system of claim 1, wherein the first electrode layer and the second electrode layer are comprised of a conductive skin or a conductive fabric.
9. The steering wheel hands-free detection system according to any one of claims 1-8, wherein the steering wheel is divided into N regions comprising N alternating current sources of different output frequencies, N first electrode layers,
A second electrode layer disposed on the backrest and/or the seat cushion of the seat;
and a detection circuit configured to detect the intensities of the signals of the N different output frequencies to determine the location of the human hand on the steering wheel.
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| CN202211193548.3A CN116022236B (en) | 2022-09-28 | 2022-09-28 | Steering wheel is from hand detecting system |
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| CN202211193548.3A CN116022236B (en) | 2022-09-28 | 2022-09-28 | Steering wheel is from hand detecting system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102019120136A1 (en) * | 2019-07-25 | 2021-01-28 | Valeo Schalter Und Sensoren Gmbh | Capacitive sensor device, steering wheel with a capacitive sensor device, method for operating a capacitive sensor device and / or a steering wheel and vehicle with a capacitive sensor device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE112016001183B4 (en) * | 2015-03-13 | 2020-07-30 | Panasonic Intellectual Property Management Co., Ltd. | Steering wheel grip detection device |
| JP6422058B2 (en) * | 2015-04-15 | 2018-11-14 | 本田技研工業株式会社 | Grip detection device |
| JP6840037B2 (en) * | 2016-10-17 | 2021-03-10 | Ｊｏｙｓｏｎ Ｓａｆｅｔｙ Ｓｙｓｔｅｍｓ Ｊａｐａｎ株式会社 | Detection system |
| IT201700097665A1 (en) * | 2017-08-30 | 2019-03-02 | Key Safety Systems Inc | SYSTEM FOR DETECTING THE PRESENCE OR THE ABSENCE OF HANDS ON THE STEERING WHEEL. |
| JP2019213663A (en) * | 2018-06-12 | 2019-12-19 | 株式会社東海理化電機製作所 | Steering device |
| KR102428103B1 (en) * | 2020-10-08 | 2022-08-03 | 한국알프스 주식회사 | A system for detecting grip and gestures on steering wheels using capacitive sensors and how to detect them |
| CN113602342B (en) * | 2021-08-31 | 2022-11-25 | 浙江智柔科技有限公司 | Steering wheel with hand-off detection function and steering wheel system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102019120136A1 (en) * | 2019-07-25 | 2021-01-28 | Valeo Schalter Und Sensoren Gmbh | Capacitive sensor device, steering wheel with a capacitive sensor device, method for operating a capacitive sensor device and / or a steering wheel and vehicle with a capacitive sensor device |
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