CN-122009058-A - Cabin regulation and control method and system based on steering wheel contact type physiological signals

CN122009058ACN 122009058 ACN122009058 ACN 122009058ACN-122009058-A

Abstract

The invention belongs to the technical field of vehicle-mounted intelligent control and man-machine interaction, and provides a cabin regulation and control method and system based on steering wheel contact type physiological signals, wherein piezoelectric signals in a non-holding steering wheel state are used as noise reference channels to capture vibration of a chassis and a steering column; the method comprises the steps of taking a piezoelectric signal in a holding state of a steering wheel as a main signal channel, using dual-channel motion compensation filtering, introducing nonlinear scale factors to compensate the difference of vibration transfer functions under different holding forces, performing piezoelectric signal filtering processing, correcting a skin electric signal when the pressure change rate of the skin electric signal of a driver exceeds a preset threshold value, filtering overlapping noise related to vehicle engine vibration and road surface impact on the premise of not damaging physiological characteristics, effectively correcting signals when abrupt change occurs on the basis of the pressure change rate, improving the processing precision of monitoring signals, ensuring the effect of a cabin environment regulation strategy and improving driving safety.

Inventors

HU SONGTAO
LI SHAN
LU MINGLI
ZHU HUI
SUN JIE
Miao sheng
GUO YANG

Assignees

青岛理工大学

Dates

Publication Date: 20260512
Application Date: 20260409

Claims (10)

1. Cabin regulation and control method based on steering wheel contact type physiological signals is characterized by comprising the following steps: Acquiring a piezoelectric signal of a steering wheel held by a driver and a skin electric signal of the driver; The piezoelectric signal in the holding state of the steering wheel is used as a main signal channel, the double-channel motion compensation filtering is used, nonlinear scale factors are introduced to compensate the difference of vibration transfer functions under different holding forces, and piezoelectric signal filtering processing is carried out; when the pressure change rate of the skin electric signal of the driver exceeds a preset threshold value, correcting the skin electric signal; Obtaining a regulating intensity index according to the filtered piezoelectric signals and the corrected skin electric signals, the state intensity score and the confidence level, determining a cabin regulating decision according to the regulating intensity index, and carrying out cabin regulation.
2. The cabin regulation and control method based on steering wheel contact physiological signals as set forth in claim 1, wherein the piezoelectric signal filtering process comprises capturing chassis and steering column vibrations using piezoelectric sensor units in a non-holding state in a sensor array as noise reference channels, using the piezoelectric sensors in a holding state as main signal channels, using adaptive cancellation logic, and introducing nonlinear scale factors Compensating for differences in vibration transfer functions at different grips.
3. The cabin regulation method based on steering wheel contact physiological signals according to claim 2, wherein the output signal after the piezoelectric signal filtering processing is: ; Wherein, the Is an output signal; Is a reference channel signal; Is the main channel signal; is a nonlinear scale factor; representing the time of the adaptive filter as the adaptive weight vector Coefficient matrix at the time; Is the reference channel signal.
4. The cabin conditioning method based on steering wheel contact physiological signals according to claim 1, wherein the conductance after the skin electrical signal correction is: ; Wherein, the Is the modified conductance; is the original electrical signal directly collected by the skin electric sensor; A gain coefficient is compensated for pressure; the logarithmic function is used to simulate non-linear contact impedance changes in physical contact.
5. The cabin regulation and control method based on steering wheel contact type physiological signals as set forth in claim 1, wherein the physiological feature vector is collected as a physiological reference image sequence in the current driving environment within a preset time before the driver enters the holding state, and then enters a real-time collection stage, and a standardized deviation degree is calculated for each dimension : ; Wherein, the Is the first Standardized deviation of vitamin profile; is the first Real-time measurements of vitamin profile; To build up the first A vitamin physical characteristic reference value; is the reference period of the first time Standard deviation of the physiological characteristic signal.
6. The cabin regulation and control method based on steering wheel contact type physiological signals according to claim 1, wherein classification is performed according to deviation degree weights of different dimensions, namely heart rate index is reduced, grip strength frequency is reduced, fatigue labels are output, skin conductance response is peaked, average grip strength is continuously high and fluctuates, anxiety labels are output, skin electric level rising slope is higher than a preset value, heart rate is rapidly increased within a preset time, anger labels are output as dominant deviation, characteristic values without deviation reference values are output, normal labels are output, and state strength scores are obtained after state labels are generated : ; Wherein, the Is a sensitivity gain coefficient; To be assigned to the first for status tag The weight coefficient of the dimensional characteristic deviation degree is higher than the skin conductance when the fatigue is judged; to activate the threshold offset; is the first Normalized deviation of vitamin profile.
7. A method of cabin conditioning based on steering wheel contact physiological signals according to claim 1, wherein the conditioning intensity index is the product of a state intensity score and a confidence level.
8. The steering wheel contact physiological signal based cabin conditioning method according to claim 1, wherein the confidence level The method comprises the following steps: ; Wherein, the For the contact quality factor, reflecting the lamination stability degree and pressure distribution consistency of the hands of the driver and the sensor array, and reducing the contact quality factor score if the hands frequently slide on the steering wheel; the signal purity factor reflects the degree of the original signal subjected to mechanical vibration and electromagnetic interference of the vehicle, and if the signal is on a bumpy road surface, the signal purity factor is reduced; The state time consistency factor is reflected to be the trend of the continuous judging result, if the state labels of a plurality of sampling periods are consistent, the state time consistency factor is increased, and if the state labels show consistency on a time axis, the state time consistency factor is increased; as a driving behavior punishment coefficient, if a sharp turn or an emergency obstacle avoidance occurs, the driving behavior punishment coefficient is adjusted downwards; 、 And The weighting weight of each quality factor belongs to preset system parameters.
9. The cabin regulation method based on the steering wheel contact physiological signal according to claim 1, wherein if the regulation intensity index is smaller than or equal to a first preset value, the air conditioning system regulates down the first preset temperature value, the atmosphere lamp is switched to a faint yellow mild prompt to release fresh fragrance, if the regulation intensity index is larger than the first preset value and smaller than or equal to a second preset value, the air conditioning system regulates down the second preset temperature value, starts a seat ventilation function, broadcasts a voice prompt suggesting a rest, if the regulation intensity index is larger than the second preset value and smaller than or equal to a third preset value, the steering wheel triggers continuous physical vibration, the safety belt executes a tightening prompt, the instrument panel blinks a red warning icon, and the atmosphere lamp is switched to a red warning prompt, wherein the first preset value is smaller than the second preset value and the second preset value is smaller than the third preset value, and the first preset temperature value is smaller than the second preset temperature value.
10. Cabin regulation and control system based on steering wheel contact physiological signal, characterized by comprising: The data acquisition module is configured to acquire a piezoelectric signal of a steering wheel held by a driver and a skin electric signal of the driver; The first data processing module is configured to capture the vibration of the chassis and the steering column by using the piezoelectric signal in a non-holding steering wheel state as a noise reference channel, take the piezoelectric signal in a holding steering wheel state as a main signal channel, use dual-channel motion compensation filtering, introduce nonlinear scale factors to compensate the difference of vibration transfer functions under different holding powers, and carry out piezoelectric signal filtering processing; The second data processing module is configured to correct the skin electric signal when the pressure change rate of the skin electric signal of the driver exceeds a preset threshold value; The control module is configured to obtain a regulation intensity index according to the filtered piezoelectric signals and the corrected skin electric signals, the state intensity score and the confidence level, determine a cabin regulation decision according to the regulation intensity index, and regulate and control the cabin.

Description

Cabin regulation and control method and system based on steering wheel contact type physiological signals Technical Field The invention belongs to the technical field of vehicle-mounted intelligent control and man-machine interaction, and particularly relates to a cabin regulation and control method and system based on steering wheel contact type physiological signals. Background With the improvement of the intelligent automobile and the driving safety requirement, the real-time monitoring of the state of the driver to make effective strategies such as cabin environment regulation and control become an important means for guaranteeing the driving safety. The real-time monitoring signal is characterized in that the frequency of vehicle engine vibration and road surface impact is overlapped with heart rate and respiratory frequency, and the contact area and pressure of palms and steering wheels are suddenly changed when a driver turns or shifts gears, so that skin electric signals generate pseudo peaks which are easy to be misjudged as emotion fluctuation, overlapping noise cannot be filtered out on the premise of not damaging physiological characteristics by the existing signal processing, and the suddenly changed monitoring signal cannot be effectively corrected, so that the corresponding cabin environment regulation strategy effect is poor, and driving safety is influenced. Disclosure of Invention In order to solve the problems, the invention provides a cabin regulation and control method and system based on steering wheel contact type physiological signals, which can filter out the overlapping noise related to the vibration of a vehicle engine and the road surface impact on the premise of not damaging the physiological characteristics, effectively correct the signals when abrupt change occurs by taking the pressure change rate as a judgment basis, improve the processing precision of monitoring signals, ensure the effect of cabin environment regulation and control strategies and improve the driving safety. In order to achieve the above object, the present invention is realized by the following technical scheme: In a first aspect, the invention provides a cabin regulation method based on steering wheel contact physiological signals, comprising the following steps: Acquiring a piezoelectric signal of a steering wheel held by a driver and a skin electric signal of the driver; The piezoelectric signal in the holding state of the steering wheel is used as a main signal channel, the double-channel motion compensation filtering is used, nonlinear scale factors are introduced to compensate the difference of vibration transfer functions under different holding forces, and piezoelectric signal filtering processing is carried out; when the pressure change rate of the skin electric signal of the driver exceeds a preset threshold value, correcting the skin electric signal; Obtaining a regulating intensity index according to the filtered piezoelectric signals and the corrected skin electric signals, the state intensity score and the confidence level, determining a cabin regulating decision according to the regulating intensity index, and carrying out cabin regulation. Further, the piezoelectric signal filtering processing comprises capturing chassis and steering column vibration by using piezoelectric sensors in a non-holding state in a sensor array as noise reference channels, using the piezoelectric sensors in the holding state as main signal channels, adopting self-adaptive cancellation logic, and introducing nonlinear scale factorsCompensating for differences in vibration transfer functions at different grips. Further, the output signal after the piezoelectric signal filtering processing is: ; Wherein, the Is an output signal; Is a reference channel signal; Is the main channel signal; is a nonlinear scale factor; representing the time of the adaptive filter as the adaptive weight vector Coefficient matrix at the time; Is the reference channel signal. Further, the conductance of the skin electric signal after correction is: ; Wherein, the Is the modified conductance; is the original electrical signal directly collected by the skin electric sensor; A gain coefficient is compensated for pressure; the logarithmic function is used to simulate non-linear contact impedance changes in physical contact. Further, in a preset time before the driver enters the holding state, acquiring a physiological characteristic vector as a physiological reference image sequence in the current driving environment, then entering a real-time acquisition stage, and calculating a standardized deviation degree according to each dimension: ; Wherein, the Is the firstStandardized deviation of vitamin profile; is the first Real-time measurements of vitamin profile; To build up the first A vitamin physical characteristic reference value; is the reference period of the first time Standard deviation of the physiological characteristic signal. Fu