CN117470419A - Hand detection device and method for steering wheel and steering wheel - Google Patents
Hand detection device and method for steering wheel and steering wheel Download PDFInfo
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- CN117470419A CN117470419A CN202311423075.6A CN202311423075A CN117470419A CN 117470419 A CN117470419 A CN 117470419A CN 202311423075 A CN202311423075 A CN 202311423075A CN 117470419 A CN117470419 A CN 117470419A
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- 238000001514 detection method Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000012545 processing Methods 0.000 claims abstract description 43
- 230000008859 change Effects 0.000 claims abstract description 42
- 230000006698 induction Effects 0.000 claims abstract description 22
- 230000003247 decreasing effect Effects 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 6
- 238000003745 diagnosis Methods 0.000 description 16
- 238000010586 diagram Methods 0.000 description 7
- 230000009191 jumping Effects 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
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- 230000008569 process Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 239000000741 silica gel Substances 0.000 description 2
- 229910002027 silica gel Inorganic materials 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
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- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/14—Measuring force or stress, in general by measuring variations in capacitance or inductance of electrical elements, e.g. by measuring variations of frequency of electrical oscillators
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D1/00—Steering controls, i.e. means for initiating a change of direction of the vehicle
- B62D1/02—Steering controls, i.e. means for initiating a change of direction of the vehicle vehicle-mounted
- B62D1/04—Hand wheels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/16—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring several components of force
- G01L5/165—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring several components of force using variations in capacitance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/22—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring the force applied to control members, e.g. control members of vehicles, triggers
- G01L5/221—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring the force applied to control members, e.g. control members of vehicles, triggers to steering wheels, e.g. for power assisted steering
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- Steering Controls (AREA)
Abstract
The invention provides a hand detection device and method for a steering wheel and the steering wheel, wherein the hand detection device comprises the following components: the sensor assembly is arranged in the steering wheel and is used for sensing capacitance induction information and pressure induction information generated when a human hand touches the steering wheel, wherein the capacitance induction information is used for representing capacitance change between the sensor assembly and the ground when the human hand touches the steering wheel, and the pressure induction information is used for representing pressure change applied to the steering wheel by the human hand; and the processing module is connected with the sensor assembly and is used for determining the touch state of the steering wheel according to the pressure sensing information and the capacitance sensing information. The invention can provide the accuracy of the detection of the steering wheel hand.
Description
Technical Field
The invention relates to the technical field of automobile detection, in particular to a hand detection device and method for a steering wheel and the steering wheel.
Background
Currently, in automotive steering wheel applications, in order to better assist in driving an automobile and improve customer experience, a human hand detection function, a steering wheel heating function, and the like have been started to be integrated in the steering wheel. The hand detection function is currently realized mainly by adopting a capacitance detection scheme, and the touch state of the hand on the steering wheel is judged by detecting the capacitance change of the capacitance sensing layer to the ground when the hand touches the steering wheel. However, existing capacitive detection schemes have certain drawbacks: when the glove is worn to grip the steering wheel, the sensing sensitivity is reduced, so that the gripping state cannot be accurately identified, and the accuracy requirement of the hand detection of the steering wheel cannot be met.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a hand detection device and method for a steering wheel and a steering wheel, so as to improve the accuracy of hand detection of the steering wheel when wearing gloves.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
in a first aspect, the present invention provides a human hand detection device for a steering wheel, comprising:
the sensor assembly is arranged in the steering wheel and is used for sensing capacitance induction information and pressure induction information generated when a human hand touches the steering wheel, wherein the capacitance induction information is used for representing capacitance change between the sensor assembly and the ground when the human hand touches the steering wheel, and the pressure induction information is used for representing pressure change applied to the steering wheel by the human hand; and
and the processing module is connected with the sensor assembly and is used for determining the touch state of the steering wheel according to the pressure sensing information and the capacitance sensing information.
Preferably, the sensor assembly comprises a capacitance sensing layer, an insulating elastic layer and a shielding layer which are sequentially stacked, and the capacitance sensing layer and the shielding layer are electrically connected with the processing module;
The first capacitance value between the capacitance sensing layer and the ground is the capacitance sensing information, and the second capacitance value between the capacitance sensing layer and the shielding layer is the pressure sensing information;
the insulating elastic layer is used for enabling the distance between the part of the capacitance sensing layer and the shielding layer to be reduced when a hand touches the steering wheel, and then the second capacitance value is increased.
Preferably, the insulating elastic layer includes: a gasket and an elastic protrusion located on at least one side of the gasket.
Preferably, the sensor assembly comprises a capacitance sensing layer area and a piezoelectric sensor which are arranged on the same layer, and the capacitance sensing layer area and the piezoelectric sensor are electrically connected with the processing module;
the first capacitance value between the capacitance sensing layer area and the ground is the capacitance sensing information, and the pressure value sensed by the piezoelectric sensor when the hand touches the steering wheel is the pressure sensing information.
Preferably, the processing module includes:
the information acquisition unit is electrically connected with the sensor assembly and is used for acquiring the capacitance sensing information and the pressure sensing information sensed by the sensor assembly;
The data processing unit is electrically connected with the information acquisition unit and is used for determining the touch state of the steering wheel according to the acquired pressure sensing information and the acquired capacitance sensing information; and
the power conversion and communication unit is electrically connected between the data processing unit and the whole vehicle system and is used for supplying power to the data processing unit and realizing data exchange between the data processing unit and the whole vehicle system.
In a second aspect, the present invention provides a human hand detection method for a steering wheel, comprising:
the method comprises the steps that capacitance induction information and pressure induction information generated when a hand touches a steering wheel are periodically induced through a sensor assembly, wherein the capacitance induction information is used for representing capacitance change between the sensor assembly and the ground when the hand touches the steering wheel, and the pressure induction information is used for representing pressure change applied to the steering wheel by the hand;
and determining the touch state of the steering wheel according to the pressure sensing information and the capacitance sensing information.
Preferably, the touch state of the steering wheel includes a hands-off state, a touch state, a grip state, and a fault state, and the determining the touch state of the steering wheel according to the pressure sensing information and the capacitance sensing information includes:
Configuring a hand-off state count, a touch state count, a grip state count and a fault state count which respectively correspond to the hand-off state, the touch state, the grip state and the fault state;
when the capacitance sensing information and the pressure sensing information in a period are in a first preset condition range, the hand-off state count is automatically increased, and the touch state count, the grip state count and the fault state count are automatically decreased;
when the capacitance sensing information and the pressure sensing information in a period are in a second preset condition range, the touch state count is automatically increased, and the hands-off state count, the grip state count and the fault state count are automatically decreased;
when the capacitance sensing information and the pressure sensing information in a period are in a third preset condition range, the grip state count is automatically increased, and the hands-off state count, the touch state count and the fault state count are automatically decreased;
when the capacitance sensing information and the pressure sensing information in a period are in a fourth preset condition range, the fault state count is automatically increased, and the hands-off state count, the touch state count and the grasping state count are automatically decreased;
and determining that the touch state of the steering wheel is a hands-off state, a light touch state, a gripping state or a fault state based on the hands-off state count, the light touch state count, the gripping state count and the fault state count.
Preferably, the determining that the touch state of the steering wheel is a hands-off state, a touch state, a grip state or a fault state includes:
when the hand-leaving state count reaches a preset number of times threshold, determining that the touch state of the steering wheel is the hand-leaving state, setting the hand-leaving state count as the preset number of times threshold, and setting the tact state count, the grip state count and the fault state count as corresponding initial values;
when the touch state count reaches a preset time threshold, determining that the touch state of the steering wheel is a touch state, setting the touch state count as the preset time threshold, and setting the hands-off state count, the grip state count and the fault state count as corresponding initial values;
when the grip state count reaches a preset number of times threshold, determining that the touch state of the steering wheel is a grip state, setting the grip state count as the preset number of times threshold, and setting the hands-off state count, the tact state count and the fault state count as corresponding initial values;
when the fault state count reaches a preset number of times threshold, determining that the touch state of the steering wheel is a fault state, setting the fault state count as the preset number of times threshold, and setting the hands-off state count, the tact state count and the grasping state count as corresponding initial values.
Preferably, the sensor assembly comprises a capacitance sensing layer, an insulating elastic layer and a shielding layer which are sequentially stacked, and the capacitance sensing layer and the shielding layer are electrically connected with the processing module;
the first capacitance value x between the capacitance sensing layer and the ground is the capacitance sensing information, and the second capacitance value y between the capacitance sensing layer and the shielding layer is the pressure sensing information;
the insulating elastic layer is used for enabling the distance between the part of the capacitance sensing layer and the shielding layer to be reduced when a hand touches the steering wheel, and then the second capacitance value y is increased.
Preferably, the first preset condition range is: x < X1& Y < Y1;
the second preset condition range is as follows: x1 is more than or equal to X2 and more than 0 and less than Y2 or Y1 is more than or equal to Y2 and more than 0 and less than X2;
the third preset condition range is as follows: x1 is more than or equal to X2 and more than 0 and less than Y2 or Y1 is more than or equal to Y2 and more than 0 and less than X2;
the fourth preset condition range is a data range except the first preset condition range, the second preset condition range and the third preset condition range;
wherein X1 represents a first capacitance threshold, X2 represents a second capacitance threshold, Y1 represents a third capacitance threshold, and Y2 represents a fourth capacitance threshold.
Preferably, the sensor assembly comprises a capacitance sensing layer area and a piezoelectric sensor which are arranged on the same layer, and the capacitance sensing layer area and the piezoelectric sensor are electrically connected with the processing module;
the first capacitance value x between the capacitance sensing layer area and the ground is the capacitance sensing information, and the pressure value f sensed by the piezoelectric sensor when the hand touches the steering wheel is the pressure sensing information.
Preferably, the first preset condition range is: x < X1& F < F1;
the second preset condition range is as follows: x1 is more than or equal to X2 and more than 0 and less than F2 or F1 is more than or equal to F2 and more than 0 and less than X2;
the third preset condition range is as follows: x1 is more than or equal to X2 and more than 0 and less than F2 or F1 is more than or equal to F2 and more than 0 and less than X2;
the fourth preset condition range is a data range except the first preset condition range, the second preset condition range and the third preset condition range;
wherein X1 represents a first capacitance threshold, X2 represents a second capacitance threshold, F1 represents a first pressure threshold, and F2 represents a second pressure threshold.
In a third aspect, the present invention provides a steering wheel comprising a human hand detection device as described above.
By adopting the technical scheme, the invention has the following beneficial effects:
According to the invention, the sensor component capable of simultaneously sensing the capacitance sensing information and the pressure sensing information generated when the hand touches the steering wheel is arranged, so that when the hand touches the steering wheel, the capacitance change between the sensor component and the ground can be sensed, and the pressure change applied to the steering wheel by the hand can be sensed, so that even if the hand is used for holding the steering wheel by wearing gloves, the sensor component is not sensitive enough to sense the capacitance change of the ground, the pressure change sensing of the hand to the steering wheel is increased, and the processing module can accurately recognize the touch state of the hand to the steering wheel after combining the changes of the sensor component and the ground, so that the accuracy of detecting the hand of the steering wheel is improved.
Drawings
FIG. 1A is a block diagram of a hand detection device for a steering wheel according to embodiments 1 and 2 of the present invention;
fig. 1B is a schematic structural diagram of a hand detection device for a steering wheel according to embodiments 1 and 2 of the present invention;
FIG. 1C is a schematic diagram of the operation of the sensor assembly of embodiments 1 and 2 of the present invention;
FIG. 1D is a schematic view of another hand detection device for steering wheel according to embodiments 1 and 2 of the present invention;
fig. 2A is a block diagram of a hand detection device for a steering wheel according to embodiments 1 and 3 of the present invention;
Fig. 2B is a schematic structural diagram of a hand detection device for steering wheel in embodiments 1 and 3 of the present invention;
FIG. 2C is a schematic diagram of the structure of the sensing layer in embodiments 1 and 3 of the present invention;
FIG. 2D is a schematic diagram of the operation of the sense layer in embodiments 1 and 3 of the present invention;
FIG. 3 is a flow chart of a method for detecting a human hand for a steering wheel in embodiment 4 of the present invention;
FIG. 4 is a flow chart of a method for detecting a human hand for a steering wheel in embodiment 5 of the present invention;
fig. 5 is a flowchart of a method for detecting a hand of a hand for a steering wheel in embodiment 6 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.
As described above, in the hand detection process of the steering wheel, it is currently common to use a single method of capacitive detection. However, in the case of sensing only a single capacitance signal, when a glove is worn to grip the steering wheel, the sensing sensitivity may be reduced, resulting in an inaccurate recognition of the grip state, which may have a significant influence on the subsequent control process of the motor vehicle, reducing the reliability of the motor vehicle.
Based on the detection device and method for the hand of the steering wheel and the steering wheel, the accurate hand detection of the steering wheel is realized by integrating capacitance induction and pressure induction. Wherein the hand detection of the steering wheel is intended to detect the touching state of the driver's hand with the steering wheel of the motor vehicle.
Example 1
The present embodiment provides a human hand detection device for a steering wheel, as shown in fig. 1A to 2D, the device specifically includes: a sensor assembly 11 disposed within the rim of the steering wheel, and a processing module 12 (ECU) connected to the sensor assembly 11. The sensor assembly 11 is used for sensing capacitance sensing information and pressure sensing information generated when a hand touches the steering wheel, the capacitance sensing information is used for representing capacitance change between the sensor assembly 11 and the ground when the hand touches the steering wheel, and the pressure sensing information is used for representing pressure change applied to the steering wheel by the hand; the processing module 12 is configured to determine a touch state of the steering wheel according to the pressure sensing information and the capacitance sensing information.
Based on the above-mentioned hand detection device, when the hand touches the steering wheel, the sensor assembly 11 can respond to the electric capacity change between sensor assembly 11 and the ground on the one hand, and on the other hand can respond to the pressure change that the hand applyed on the steering wheel, therefore even if the sensor assembly 11 is sensitive enough to the electric capacity change response of ground when wearing gloves to grasp the steering wheel, because the pressure change response of the hand to the steering wheel has been increased, processing module 12 also can accurately discern the touching state of the hand to the steering wheel after combining the change of both to the degree of accuracy that the steering wheel hand detected has been improved.
Example 2
This embodiment provides one specific implementation of embodiment 1.
As shown in fig. 1A to 1C, in the present embodiment, the sensor assembly 11 includes a capacitance sensing layer 111, an insulating elastic layer 112 and a shielding layer 113 stacked in order, and the capacitance sensing layer 111 and the shielding layer 113 are electrically connected to the processing module 12, respectively. The first capacitance value C1 between the capacitance sensing layer 111 and the ground is the capacitance sensing information, and the second capacitance value C2 between the capacitance sensing layer 111 and the shielding layer 113 is the pressure sensing information. The insulating elastic layer 112 is used to reduce the distance between the part of the capacitance sensing layer 111 and the shielding layer 113 when the hand touches the steering wheel, thereby increasing the second capacitance value C2.
Specifically, an electric field exists between the capacitance sensing layer 111 and the ground potential provided by the vehicle chassis, and the strength of the electric field and the corresponding capacitance C1 are affected by an insulator between the capacitance sensing layer 111 and ground, which may be a human body. The closer the human body is to the capacitance sensing layer 111, the larger the change in capacitance C1. When the driver's hand is directly in the vicinity of the capacitance sensing layer 111, a drastic change in capacitance C1 will be caused. Thus, the placement of a hand on the steering wheel or the departure of a hand from the steering wheel can be detected by capacitive measurement (i.e., human hand detection).
In this embodiment, the insulating elastic layer 112 is preferably a silica gel layer with high temperature resistance and high resilience material characteristics. When the hand grips the steering wheel, the gripping pressure deforms the insulating elastic layer 112, thereby reducing the distance between the capacitance sensing layer 111 and the shielding layer 113, and further changing the capacitance C2 therebetween. It will be appreciated that the greater the pressure of the hand grip, the greater the capacitance C2. That is, the magnitude of the capacitor C2 may directly reflect the magnitude of the pressure applied to the steering wheel by the hand, and the capacitor C2 represents the pressure sensing information.
The present embodiment can detect the capacitance change between the capacitance sensing layer 111 and the ground and the capacitance change between the capacitance sensing layer 111 and the shielding layer 113 at the same time, and can accurately identify the gripping state when the glove is used to grip the steering wheel.
Furthermore, in the preferred embodiment shown in fig. 1D, the insulating elastic layer 112 may further include a spacer 1121 and an elastic bump 1122 (shown as one side, it should be understood that both sides may be provided) located on at least one side of the spacer 1121. Wherein, the gasket 1121 and the elastic protrusions 1122 may be integrally formed by silica gel, and the elastic protrusions 1122 are uniformly distributed on the gasket 1121. The shape, size, and spacing of the resilient projections 1122 can vary. Preferably, the elastic protrusions 1122 are cone-shaped as shown in fig. 1D, and may be cylindrical, cubic, prismatic, pyramidal, or other suitable shape, which is not limited in any way by the present embodiment. It should be appreciated that the insulating elastic layer 112 shown in FIG. 1D enables the sensor assembly 11 to be more sensitive to pressure detection than the insulating elastic layer 112 shown in FIG. 1B without the elastic protrusions.
Referring to fig. 1A again, the processing module 12 of the present embodiment includes an information acquisition unit 121, a data processing unit 122, and a power conversion and communication unit 123. The information collecting unit 121 is electrically connected to the sensor assembly 11, and is configured to collect capacitance sensing information (i.e., the first capacitance value C1) and pressure sensing information (i.e., the second capacitance value C2) sensed by the sensor assembly 11; the data processing unit 122 is electrically connected with the information acquisition unit 121, and is used for determining the touch state of the steering wheel according to the acquired pressure sensing information and capacitance sensing information; the power conversion and communication unit 123 is electrically connected between the data processing unit 122 and the vehicle system 100, and is used for supplying power to the data processing unit 122 and realizing data exchange between the data processing unit 122 and the vehicle system 100.
It should be noted that, a specific algorithm for determining the touch state of the steering wheel by the data processing unit 122 in this embodiment will be described in detail in embodiments 4 and 5, and this embodiment is not described in detail herein.
Example 3
This embodiment provides another implementation of embodiment 1.
As shown in fig. 2A-2D, in the present embodiment, the sensor assembly 11 includes a capacitive sensing area 111 'and a piezoelectric sensor 112' disposed on the same layer, and the capacitive sensing area 111 'and the piezoelectric sensor 112' are electrically connected to the processing module 12. The first capacitance value C1 between the capacitance sensing area 111 'and the ground is the aforementioned capacitance sensing information, and the pressure value F sensed by the piezoelectric sensor 112' when the hand touches the steering wheel is the aforementioned pressure sensing information.
The piezoelectric sensor 112' in this embodiment is a sensor based on piezoelectric effect, which changes the internal conductive medium when pressure is applied, and can detect weak pressure changes.
Referring again to fig. 2C, the capacitive sensing area 111 'and the piezoelectric sensor 112' disposed on the same layer form the sensing layer 110. It should be noted that, the cross-sectional view of the sensing layer 110 shown in fig. 2C is a cross-sectional view, i.e. a schematic view taken parallel to the bottom surface of the sensing layer 110. The capacitive sensing area 111' in this embodiment has the same function as the capacitive sensing layer 111 in embodiment 2, and when the driver's hand approaches the capacitive sensing area 111', the capacitance C1 will be changed.
According to the embodiment, the pressure detection function of the hand holding the steering wheel is added on the basis of the existing capacitance detection function, and the pressure detection function are combined to solve the problem of misjudgment when the hand holding the steering wheel is worn with gloves.
Preferably, as shown in fig. 2C, capacitive sensing areas 111 'may be provided on both sides of the piezoelectric sensor 112', respectively. By providing the capacitive sensing areas 111' redundantly, even if one of the capacitive sensing areas 111' fails and fails to operate normally, the other capacitive sensing area 111' can still operate normally, thereby improving the reliability of the sensor assembly 11.
In addition, referring to fig. 2A and 2B again, the sensor assembly 11 in this embodiment may further include a shielding layer 113 located inside the sensing layer 110 (i.e. near the side of the rim skeleton of the steering wheel), and noise interference may be reduced by the shielding layer 113, so as to further improve accuracy of touch detection of the steering wheel.
Referring to fig. 1B again, the processing module 12 in this embodiment also includes an information acquisition unit 121, a data processing unit 122, and a power conversion and communication unit 123. The information collecting unit 121 is electrically connected to the sensor assembly 11, and is configured to collect capacitance sensing information (i.e., the first capacitance value C1) and pressure sensing information (i.e., the pressure value F) sensed by the sensor assembly 11; the data processing unit 122 is electrically connected with the information acquisition unit 121, and is used for determining the touch state of the steering wheel according to the acquired pressure sensing information and capacitance sensing information; the power conversion and communication unit 123 is electrically connected between the data processing unit 122 and the vehicle system, and is used for supplying power to the data processing unit 122 and realizing data exchange between the data processing unit 122 and the vehicle system.
It should be noted that, a specific algorithm for determining the touch state of the steering wheel by the data processing unit 122 in this embodiment will be described in detail in embodiments 4 and 6, and this embodiment is not described in detail herein.
Example 4
The present embodiment provides a human hand detection method for a steering wheel, as shown in fig. 3, the method includes the following steps:
s1, periodically sensing capacitance sensing information and pressure sensing information generated when a hand touches a steering wheel through a sensor assembly 11, wherein the capacitance sensing information is used for representing capacitance change between the sensor assembly 11 and the ground when the hand touches the steering wheel, and the pressure sensing information is used for representing pressure change applied to the steering wheel by the hand;
s2, determining the touch state of the steering wheel according to the pressure sensing information and the capacitance sensing information sensed by the sensor assembly 11.
In the present embodiment, the touch state of the steering wheel may include, for example, a hands-off state, a tact state, a grip state, and a failure state.
Based on this, step S2 determines the touch state of the steering wheel according to the pressure sensing information and the capacitance sensing information as follows:
first, the hands-Off state count hand_off_cnt, the Touch state count touch_cnt, the Grip state count Grip_cnt, and the Fault state count fault_cnt corresponding to the hands-Off state, the Touch state, the Grip state, and the Fault state are respectively configured.
When the capacitance sensing information and the pressure sensing information in a period are in a first preset condition range, the Hand-Off state count hand_off_cnt is self-added, and the Touch state count touch_cnt, the Grip state count Grip_cnt and the Fault state count fault_cnt are self-subtracted; when the capacitance sensing information and the pressure sensing information in a period are in a second preset condition range, the Touch state count touch_cnt is self-added, and the Hand leaving state count hand_off_cnt, the Grip state count Grip_cnt and the Fault state count fault_cnt are self-subtracted; when the capacitance sensing information and the pressure sensing information in a period are in a third preset condition range, the Grip state count Grip_cnt is self-added, the hands-Off state count hand_off_cnt, the Touch state count touch_cnt and the Fault state count fault_cnt are self-subtracted; when the capacitance sensing information and the pressure sensing information in a period are in a fourth preset condition range, the Fault state count fault_cnt is self-added, the hands-Off state count hand_off_cnt, the Touch state count touch_cnt and the Grip state count Grip_cnt are self-subtracted.
Then, based on the hands-Off state count hand_off_cnt, the Touch state count touch_cnt, the Grip state count Grip_cnt, and the Fault state count fault_cnt, the Touch state of the steering wheel is determined as the hands-Off state, the Touch state, the Grip state, or the Fault state as follows:
When the Hand leaving state count hand_off_cnt reaches a preset number of times threshold (for example, 20 times), determining that the Touch state of the steering wheel is the Hand leaving state, setting the Hand leaving state count hand_off_cnt as the preset number of times threshold, and setting the Touch state count touch_cnt, the Grip state count Grip_cnt and the Fault state count fault_cnt as corresponding initial values (generally 0);
when the Touch state count touch_cnt reaches a preset time threshold, determining that the Touch state of the steering wheel is a Touch state, setting the Touch state count touch_cnt as the preset time threshold, and setting the hands-Off state count hand_off_cnt, the Grip state count Grip_cnt and the Fault state count fault_cnt as corresponding initial values;
when the Grip state count Grip_cnt reaches a preset number of times threshold, determining that the Touch state of the steering wheel is a Grip state, setting the Grip state count Grip_cnt as the preset number of times threshold, and setting the hands-Off state count Hand Off cnt, the Touch state count Touch cnt and the Fault state count Fault cnt as corresponding initial values;
when the Fault state count fault_cnt reaches a preset number of times threshold, determining that the Touch state of the steering wheel is the Fault state, setting the Fault state count fault_cnt as the preset number of times threshold, and setting the hands-Off state count hand_off_cnt, the Touch state count touch_cnt and the Grip state count Grip_cnt as corresponding initial values.
Based on the steps, various touch states of the hand on the steering wheel can be accurately identified.
Example 5
This embodiment is a specific implementation of embodiment 4.
In this embodiment, as shown in fig. 1A-1D, the sensor assembly 11 includes a capacitance sensing layer 111, an insulating elastic layer 112 and a shielding layer 113 stacked in sequence, and the capacitance sensing layer 111 and the shielding layer 113 are electrically connected to the processing module 12 respectively; the first capacitance value x between the capacitance sensing layer 111 and the ground is capacitance sensing information, and the second capacitance value y between the capacitance sensing layer 111 and the shielding layer 113 is pressure sensing information; the insulating elastic layer 112 is used for reducing the distance between the part of the capacitance sensing layer 111 and the shielding layer 113 when the hand touches the steering wheel, so as to increase the second capacitance value y.
Meanwhile, the present embodiment sets the aforementioned first preset condition range as: x < X1& Y < Y1; the second preset condition range is set as follows: x1 is more than or equal to X2 and more than 0 and less than Y2 or Y1 is more than or equal to Y2 and more than 0 and less than X2; the third preset condition range is set as follows: x1 is more than or equal to X2 and more than 0 and less than Y2 or Y1 is more than or equal to Y2 and more than 0 and less than X2; the fourth preset condition range is set to be a data range other than the first preset condition range, the second preset condition range, and the third preset condition range. Wherein X1 represents a first capacitance threshold, X2 represents a second capacitance threshold, Y1 represents a third capacitance threshold, and Y2 represents a fourth capacitance threshold.
Based on the above, the present embodiment specifically adopts the specific flow shown in fig. 4 to identify that the steering wheel is in the hands-off state, the tact state, the grip state or the failure state, and the flow is as follows:
initializing, and defining initial values of Hand-away state count, touch state count, grip state count and Fault state count, wherein hand_off_cnt=0, touch_cnt=0, grip_cnt=0 and fault_cnt=0.
The first step: judging whether X < X1& Y < Y1 (namely a first preset condition range) is met, if not, jumping to a second step, if so, adding 1 to the count corresponding to the hand_off_cnt, and subtracting 1 to the count corresponding to the touch_cnt, the Grip_cnt and the fault_cnt; then judging whether the hand_off_cnt is more than or equal to 20 (wherein 20 represents a preset time threshold), if the hand_off_cnt is not met, performing next time data acquisition and diagnosis at intervals of 10ms (namely the next period), if the hand_off_cnt is more than or equal to 20, judging whether the steering wheel is in a light Touch state or a grasp state or a Fault state currently, if the steering wheel is in any one of the three states, clearing the current state and outputting the steering wheel again to be in an Off-Hand state, otherwise, directly outputting the steering wheel to be in an Off-Hand state, and defining corresponding count values as the hand_off_cnt=20, touch_cnt=0, grip_cnt=0 and fault_cnt=0 when the steering wheel is in the Off-Hand state, and performing next time data acquisition and diagnosis at intervals of 10 ms.
And a second step of: if the first step judges that X is not more than X < X1& Y < Y1, continuing judging whether X1 is less than or equal to X < X2&0 < Y < Y2 or Y1 is less than or equal to Y < Y2&0 < X < X2 (namely, a second preset condition range), if yes, adding 1 to the count corresponding to touch_cnt, and subtracting 1 from the count corresponding to hand_off_cnt, grip_cnt and fault_cnt; and judging whether the touch_cnt is more than or equal to 20 or not, if the touch_cnt is not more than 20, performing next data acquisition and diagnosis at intervals of 10ms, if the touch_cnt is more than or equal to 20, judging whether the steering wheel is in a hands-Off state or a gripping state or a Fault state currently, if the steering wheel is in any one of the three states, clearing the current state and outputting the steering wheel state again to be in a light Touch state, otherwise, directly outputting the steering wheel state to be in the light Touch state, and defining corresponding count values as hand_off_cnt=0, touch_cnt=20, grip_cnt=0 and fault_cnt=0 when the steering wheel state is in the light Touch state, and performing next data acquisition and diagnosis at intervals of 10 ms.
And a third step of: if the second step judges that X1 is less than or equal to X2 and less than 0 is less than or equal to Y2 or Y1 is less than or equal to Y2 and less than 0 is less than or equal to X2 and less than or equal to X3 and less than or equal to Y3 or Y2 is less than or equal to Y3 and less than or equal to 0 is less than or equal to X3 (namely, the third preset condition range), if not, jumping to the fourth step, if yes, adding 1 to the count corresponding to Grip_cnt, and subtracting 1 from the count corresponding to Hand_off_cnt, touch_cnt and fault_cnt; then judging whether Grip_cnt is more than or equal to 20, if not, performing next data acquisition and diagnosis at intervals of 10ms, if Grip_cnt is more than or equal to 20, judging whether the steering wheel is in a hands-Off state or a light Touch state or a Fault state currently, if any one of the three states is met, clearing the current state and outputting the steering wheel to be in a Grip state, otherwise, directly outputting the steering wheel to be in the Grip state, and when the steering wheel is in the Grip state, defining corresponding count values as hand_off_cnt=0, touch_cnt=0, grip_cnt=20 and fault_cnt=0, and performing next data acquisition and diagnosis at intervals of 10 ms.
Fourth step: if the third step judges that X2 is less than or equal to X3 and less than 0 and less than Y3 or Y2 is less than or equal to Y3 and less than 0 and less than X3, the count corresponding to the fault_cnt is increased by 1, and the count corresponding to the hand_off_cnt, the touch_cnt and the Grip_cnt is decreased by 1; and then judging whether the fault_cnt is more than or equal to 20, if the fault_cnt is not more than 20, performing next data acquisition and diagnosis at intervals of 10ms, if the fault_cnt is more than or equal to 20, judging whether the steering wheel is in a hands-Off state or a light Touch state or a gripping state currently, if the steering wheel is in any one of the three states, clearing the current state and outputting the steering wheel as a Fault state, otherwise, directly outputting the steering wheel as the Fault state, and when the steering wheel is in the Fault state, defining corresponding count values as hand_off_cnt=0, touch_cnt=0, grip_cnt=0 and fault_cnt=20, and performing next data acquisition and diagnosis at intervals of 10 ms.
The principle of setting the preset condition range in this embodiment is that: when the steering wheel is not lightly touched with a glove, the threshold range corresponding to the X value and the Y value simultaneously satisfies X1-X < X2, Y1-Y < Y2, but when the steering wheel is lightly touched with a glove, the capacitance change of the capacitance sensing layer 111 to the ground through a human body is less sensitive, the detected X value may be smaller than X1, the threshold condition of X1-X < X2 is not satisfied, if the capacitance change to the ground is detected by only a single capacitance sensing layer 111, the possibility of misjudgment as a hands-off state occurs, at this time, the Y value causing the capacitance change between the capacitance sensing layer 111 and the shielding layer 113 due to the change of the contact force is increased, and when the Y value satisfies Y1-Y < Y2 due to the contact force, the touch state can be judged. When the steering wheel is not held by the glove, the threshold range corresponding to the X value and the Y value simultaneously satisfies X2 & lt X3, Y3& lt Y3, but when the steering wheel is held by the glove, the capacitance sensing layer 111 is less sensitive to the change of the capacitance to the ground through the human body, the detected X value may be smaller than X2, the threshold condition of X2 & lt X3 is not satisfied, if the capacitance change to the ground is detected by only a single capacitance sensing layer 111, the possibility of misjudging as a light touch state occurs, if the Y value of the capacitance change generated between the capacitance sensing layer 111 and the shielding layer 113 due to the change of the gripping force is increased at the moment, and when the Y value satisfies Y2 & lt Y3 due to the gripping force, the gripping state can be judged. Thereby, accuracy of the steering wheel touch state recognition can be provided.
Example 6
This embodiment is another specific implementation of embodiment 4.
In the present embodiment, as shown in fig. 2A-2D, the sensor assembly 11 includes a capacitive sensing area 111 'and a piezoelectric sensor 112' disposed on the same layer, and the capacitive sensing area 111 'and the piezoelectric sensor 112' are electrically connected to the processing module 12, respectively. The first capacitance value x between the capacitance sensing area 111 'and the ground is capacitance sensing information, and the pressure value f sensed by the piezoelectric sensor 112' when the hand touches the steering wheel is pressure sensing information.
Meanwhile, the present embodiment sets the first preset condition range as: x < X1& F < F1; the second preset condition range is set as follows: x1 is more than or equal to X2 and more than 0 and less than F2 or F1 is more than or equal to F2 and more than 0 and less than X2; the third preset condition range is set as follows: x1 is more than or equal to X2 and more than 0 and less than F2 or F1 is more than or equal to F2 and more than 0 and less than X2; the fourth preset condition range is set to be a data range except the first preset condition range, the second preset condition range and the third preset condition range; wherein X1 represents a first capacitance threshold, X2 represents a second capacitance threshold, F1 represents a first pressure threshold, and F2 represents a second pressure threshold.
Based on the above, the present embodiment specifically adopts the flow shown in fig. 5 to identify that the steering wheel is in the hands-off state, the tact state, the grip state, or the failure state, the flow being as follows:
Initializing, and defining initial values of Hand-away state count, touch state count, grip state count and Fault state count, wherein hand_off_cnt=0, touch_cnt=0, grip_cnt=0 and fault_cnt=0.
The first step: judging whether X < X1& F < F1 (namely a first preset condition range) is met, if not, jumping to a second step, and if so, adding 1 to the count corresponding to hand_off_cnt and subtracting 1 from the count corresponding to touch_cnt, grip_cnt and fault_cnt; then judging whether the hand_off_cnt is more than or equal to 20 (wherein 20 represents a preset time threshold), if the hand_off_cnt is not met, performing next time data acquisition and diagnosis at intervals of 10ms (namely the next period), if the hand_off_cnt is more than or equal to 20, judging whether the steering wheel is in a light Touch state or a gripping state or a Fault state currently, if the steering wheel is in any one of the three states, clearing the current state and outputting the steering wheel again to be in a hands-Off state, if the steering wheel is not in the light Touch state or the gripping state or the Fault state currently, directly outputting the steering wheel to be in the hands-Off state, and defining corresponding count values as the hand_off_cnt=20, the touch_cnt=0, the Grip_cnt=0 and the fault_cnt=0 when the steering wheel is in the hands-Off state, and performing next time data acquisition and diagnosis again at intervals of 10 ms.
And a second step of: if the first step judges that X is not satisfied with X < X1& F < F1, judging whether X is not more than 1 and less than X2 and less than 0 and less than F2 or F1 is not more than F2 and less than 0 and less than X and less than X2 (namely, a second preset condition range), if not, jumping to a third step, if so, adding 1 to the count corresponding to the touch_cnt, and subtracting 1 to the count corresponding to the hand_off_cnt, the Grip_cnt and the fault_cnt; then judging whether the touch_cnt is more than or equal to 20, if not, performing next data acquisition and diagnosis at intervals of 10ms, if the touch_cnt is more than or equal to 20, judging whether the steering wheel is in a hands-Off state or a gripping state or a Fault state currently, if any one of the three states is in the hands-Off state or the gripping state or the Fault state, clearing the current state and outputting the steering wheel as a light Touch state, if the steering wheel is not in the hands-Off state or the gripping state or the Fault state currently, directly outputting the steering wheel as the light Touch state, and when the steering wheel is in the light Touch state, defining corresponding count values as hand_off_cnt=0, touch_cnt=20, clip_cnt=0 and fault_cnt=0, and performing next data acquisition and diagnosis at intervals of 10 ms.
And a third step of: if X1 is not more than X < X2&0 < F2 or F1 is not more than F2&0 < X2, judging whether X2 is not more than X < X3&0 < F3 or F2 is not more than F3&0 < X3= (i.e., a third preset condition range), if not, jumping to the fourth step, if yes, adding 1 to the count corresponding to the grip_cnt, subtracting 1 to the count corresponding to the handl_cnt, the touch_cnt, and then judging whether the grip_cnt is not more than 20, if not, performing next data acquisition and diagnosis at intervals of 10ms, if yes, judging whether the steering wheel is currently in a hands-free state or a Touch state or a Fault state, if any one of the three states is met, then clearing the current state, outputting the steering wheel state as the Grip state, if the current state is not in the hands-free state or the light state, subtracting 1 from the count corresponding to the handl_cnt, then performing the next data acquisition and diagnosis at intervals of 10ms when the grip_cnt = 0 to the handl_cnt, and then performing the direct data acquisition and the count value of the touch_cnt = 0 to the handl_cnt when the three states are not met.
Fourth step: if the third step judges that X2 is less than or equal to X3 and less than 0 and less than F3 or F2 is less than or equal to F3 and less than 0 and less than X3, the count corresponding to the fault_cnt is increased by 1, and the count corresponding to the hand_off_cnt, the touch_cnt and the Grip_cnt is decreased by 1; then judging whether the fault_cnt is more than or equal to 20, if not, performing next data acquisition and diagnosis at intervals of 10ms, if the fault_cnt is more than or equal to 20, judging whether the steering wheel is in a hands-Off state or a light Touch state or a gripping state currently, if any one of the three states is in the hands-Off state or the light Touch state, clearing the current state, outputting the steering wheel as a Fault state, if the steering wheel is not in the hands-Off state or the light Touch state or the gripping state currently, directly outputting the steering wheel as the Fault state, and defining corresponding count values as hand_off_cnt=0, touch_cnt=0, clip_cnt=0 and fault_cnt=20 when the steering wheel is in the Fault state, and performing next data acquisition and diagnosis at intervals of 10 ms.
The principle of setting the preset condition range in this embodiment is that: when the steering wheel is not lightly touched by wearing a glove, the threshold range corresponding to the X value and the F value simultaneously satisfies X1 is less than or equal to X2, F1 is less than or equal to F2, but when the steering wheel is lightly touched by wearing a glove, the capacitance change of the capacitance sensing area 111 'through the human body is less sensitive, the detected X value may be less than X1, the threshold condition that X1 is less than or equal to X2 is not satisfied, if the capacitance change of the steering wheel is detected by only a single capacitance sensing area 111', the possibility of misjudging as a hands-off state occurs, if the F value for detecting the contact force change of the steering wheel is increased at the moment, and when the contact force makes the F value satisfy F1 is less than or equal to F2, the touch state can be judged. When the steering wheel is not held by the glove, the threshold range corresponding to the X value and the F value simultaneously satisfies X2 is less than or equal to X3, and F3 is less than or equal to F3, but when the steering wheel is held by the glove, the capacitance sensing area 111 'is less sensitive to the change of the capacitance to the ground through the human body, the detected X value may be less than X2, the threshold condition that X2 is less than or equal to X3 is not satisfied, if the change of the capacitance to the ground is detected by the single capacitance sensing area 111', the possibility of misjudging as a light touch state occurs, if the F value for detecting the change of the grip force of the steering wheel is increased at the moment, and when the grip force makes the F value satisfy F2 is less than or equal to F3, the grip state can be judged. Thus, accuracy of the steering wheel touch state recognition can be provided.
Example 7
This embodiment provides a steering wheel comprising a human hand detection device as provided in any one of embodiments 1-3. Therefore, the specific details and the beneficial effects of the hand detection device according to embodiments 1-3 can be used in this embodiment, and will not be described here.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the invention, but such changes and modifications fall within the scope of the invention.
Claims (13)
1. A human hand detection device for a steering wheel, comprising:
the sensor assembly is arranged in the steering wheel and is used for sensing capacitance induction information and pressure induction information generated when a human hand touches the steering wheel, wherein the capacitance induction information is used for representing capacitance change between the sensor assembly and the ground when the human hand touches the steering wheel, and the pressure induction information is used for representing pressure change applied to the steering wheel by the human hand; and
And the processing module is connected with the sensor assembly and is used for determining the touch state of the steering wheel according to the pressure sensing information and the capacitance sensing information.
2. The human hand detection device of claim 1, wherein the sensor assembly comprises a capacitive sensing layer, an insulating elastic layer, and a shielding layer stacked in sequence, and the capacitive sensing layer and shielding layer are electrically connected to the processing module;
the first capacitance value between the capacitance sensing layer and the ground is the capacitance sensing information, and the second capacitance value between the capacitance sensing layer and the shielding layer is the pressure sensing information;
the insulating elastic layer is used for enabling the distance between the part of the capacitance sensing layer and the shielding layer to be reduced when a hand touches the steering wheel, and then the second capacitance value is increased.
3. A human hand detection device according to claim 3, wherein the insulating elastic layer comprises: a gasket and an elastic protrusion located on at least one side of the gasket.
4. A human hand detection device according to claim 1, wherein the sensor assembly comprises a capacitive sensing area and a piezoelectric sensor disposed on the same layer, and the capacitive sensing area and piezoelectric sensor are electrically connected to the processing module;
The first capacitance value between the capacitance sensing area and the ground is the capacitance sensing information, and the pressure value sensed by the piezoelectric sensor when the hand touches the steering wheel is the pressure sensing information.
5. A human hand detection device according to any one of claims 1 to 4, wherein the processing module comprises:
the information acquisition unit is electrically connected with the sensor assembly and is used for acquiring the capacitance sensing information and the pressure sensing information sensed by the sensor assembly;
the data processing unit is electrically connected with the information acquisition unit and is used for determining the touch state of the steering wheel according to the acquired pressure sensing information and the acquired capacitance sensing information; and
the power conversion and communication unit is electrically connected between the data processing unit and the whole vehicle system and is used for supplying power to the data processing unit and realizing data exchange between the data processing unit and the whole vehicle system.
6. A method of detecting a human hand for a steering wheel, comprising:
the method comprises the steps that capacitance induction information and pressure induction information generated when a hand touches a steering wheel are periodically induced through a sensor assembly, wherein the capacitance induction information is used for representing capacitance change between the sensor assembly and the ground when the hand touches the steering wheel, and the pressure induction information is used for representing pressure change applied to the steering wheel by the hand;
And determining the touch state of the steering wheel according to the pressure sensing information and the capacitance sensing information.
7. The method of claim 6, wherein the touch state of the steering wheel includes a hands-off state, a tap state, a grip state, and a fault state, and wherein determining the touch state of the steering wheel based on the pressure sensing information and the capacitance sensing information comprises:
configuring a hand-off state count, a touch state count, a grip state count and a fault state count which respectively correspond to the hand-off state, the touch state, the grip state and the fault state;
when the capacitance sensing information and the pressure sensing information in a period are in a first preset condition range, the hand-off state count is automatically increased, and the touch state count, the grip state count and the fault state count are automatically decreased;
when the capacitance sensing information and the pressure sensing information in a period are in a second preset condition range, the touch state count is automatically increased, and the hands-off state count, the grip state count and the fault state count are automatically decreased;
when the capacitance sensing information and the pressure sensing information in a period are in a third preset condition range, the grip state count is automatically increased, and the hands-off state count, the touch state count and the fault state count are automatically decreased;
When the capacitance sensing information and the pressure sensing information in a period are in a fourth preset condition range, the fault state count is automatically increased, and the hands-off state count, the touch state count and the grasping state count are automatically decreased;
and determining that the touch state of the steering wheel is a hands-off state, a light touch state, a gripping state or a fault state based on the hands-off state count, the light touch state count, the gripping state count and the fault state count.
8. The method of human hand detection according to claim 7, wherein the determining that the touch state of the steering wheel is a hands-off state, a flick state, a grip state, or a fault state comprises:
when the hand-leaving state count reaches a preset number of times threshold, determining that the touch state of the steering wheel is the hand-leaving state, setting the hand-leaving state count as the preset number of times threshold, and setting the tact state count, the grip state count and the fault state count as corresponding initial values;
when the touch state count reaches a preset time threshold, determining that the touch state of the steering wheel is a touch state, setting the touch state count as the preset time threshold, and setting the hands-off state count, the grip state count and the fault state count as corresponding initial values;
When the grip state count reaches a preset number of times threshold, determining that the touch state of the steering wheel is a grip state, setting the grip state count as the preset number of times threshold, and setting the hands-off state count, the tact state count and the fault state count as corresponding initial values;
when the fault state count reaches a preset number of times threshold, determining that the touch state of the steering wheel is a fault state, setting the fault state count as the preset number of times threshold, and setting the hands-off state count, the tact state count and the grasping state count as corresponding initial values.
9. A human hand detection method according to claim 7 or 8, wherein the sensor assembly comprises a capacitive sensing layer, an insulating elastic layer and a shielding layer stacked in sequence, and the capacitive sensing layer and the shielding layer are electrically connected with the processing module;
the first capacitance value x between the capacitance sensing layer and the ground is the capacitance sensing information, and the second capacitance value y between the capacitance sensing layer and the shielding layer is the pressure sensing information;
the insulating elastic layer is used for enabling the distance between the part of the capacitance sensing layer and the shielding layer to be reduced when a hand touches the steering wheel, and then the second capacitance value y is increased.
10. The human hand detection method of claim 9, wherein the first preset condition range is: x < X1& Y < Y1;
the second preset condition range is as follows: x1 is more than or equal to X2 and more than 0 and less than Y2 or Y1 is more than or equal to Y2 and more than 0 and less than X2;
the third preset condition range is as follows: x1 is more than or equal to X2 and more than 0 and less than Y2 or Y1 is more than or equal to Y2 and more than 0 and less than X2;
the fourth preset condition range is a data range except the first preset condition range, the second preset condition range and the third preset condition range;
wherein X1 represents a first capacitance threshold, X2 represents a second capacitance threshold, Y1 represents a third capacitance threshold, and Y2 represents a fourth capacitance threshold.
11. A method of human hand detection according to claim 7 or 8 wherein the sensor assembly comprises a capacitive sensing area and a piezoelectric sensor arranged on the same layer, and the capacitive sensing area and piezoelectric sensor are electrically connected to the processing module;
the first capacitance value x between the capacitance sensing area and the ground is the capacitance sensing information, and the pressure value f sensed by the piezoelectric sensor when the hand touches the steering wheel is the pressure sensing information.
12. The human hand detection method of claim 11, wherein the first preset condition range is: x < X1& F < F1;
The second preset condition range is as follows: x1 is more than or equal to X2 and more than 0 and less than F2 or F1 is more than or equal to F2 and more than 0 and less than X2;
the third preset condition range is as follows: x1 is more than or equal to X2 and more than 0 and less than F2 or F1 is more than or equal to F2 and more than 0 and less than X2;
the fourth preset condition range is a data range except the first preset condition range, the second preset condition range and the third preset condition range;
wherein X1 represents a first capacitance threshold, X2 represents a second capacitance threshold, F1 represents a first pressure threshold, and F2 represents a second pressure threshold.
13. A steering wheel comprising a human hand detection device according to any one of the preceding claims 1-5.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118518140A (en) * | 2024-07-23 | 2024-08-20 | 比亚迪股份有限公司 | Steering wheel off-hand detection system, method and device, storage medium and vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118518140A (en) * | 2024-07-23 | 2024-08-20 | 比亚迪股份有限公司 | Steering wheel off-hand detection system, method and device, storage medium and vehicle |
| CN118518140B (en) * | 2024-07-23 | 2024-10-11 | 比亚迪股份有限公司 | Steering wheel off-hand detection system, method and device, storage medium and vehicle |
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