CN109533000B - Intelligent human-computer interaction steering wheel device with touch perception and application method - Google Patents
Intelligent human-computer interaction steering wheel device with touch perception and application method Download PDFInfo
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- CN109533000B CN109533000B CN201811534138.4A CN201811534138A CN109533000B CN 109533000 B CN109533000 B CN 109533000B CN 201811534138 A CN201811534138 A CN 201811534138A CN 109533000 B CN109533000 B CN 109533000B
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Classifications
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
- B60W50/08—Interaction between the driver and the control system
- B60W50/14—Means for informing the driver, warning the driver or prompting a driver intervention
- B60W50/16—Tactile feedback to the driver, e.g. vibration or force feedback to the driver on the steering wheel or the accelerator pedal
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Automation & Control Theory (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Human Computer Interaction (AREA)
- Steering Controls (AREA)
Abstract
The invention discloses an intelligent human-computer interaction steering wheel device with touch perception, which comprises a steering wheel device, an ECU and a flexible perception layer; the steering wheel device is arranged on the steering wheel device in a sleeved mode, and the steering wheel device and the flexible sensing layer are respectively and electrically connected with the ECU; the invention adds the flexible perception layer on the basis of the traditional steering wheel, collects the touch information of the driver, transmits the information to the driver in a mode of combining touch sense with auditory sense and visual sense, provides driving assistance which takes the intellectualization, efficiency and safety into consideration for the driver, and has great significance for safe driving and traffic safety.
Description
Technical Field
The invention relates to the technical field of intelligent automobile active safety, in particular to a steering wheel device which integrates a tactile sense concept into a steering wheel and can provide tactile sense monitoring for a driver and assist the driver to operate and an application method.
Background
The development direction of the man-machine interaction technology of the automobile in the future is towards more humanization and security. Future interactive forms no longer rely too much on visual information, more emphasizing multi-sensory channel combinations. From the perspective of the components in the vehicle, the lighting unit, the center control screen, the steering wheel and the like are mainly included. Safety and efficiency are still important consideration indexes in driving scenes from the current research progress.
For the recent research focus, the more advanced steer-by-wire (SBW) systems. Because the mechanical connection is removed, the resistance moment loses the medium transmitted to the steering wheel, so that a driver cannot directly feel the road feel in the running process of the automobile. In order to remedy the defect, the SBW system simulates a road feel through a certain method, and the simulated road feel is provided for a driver by means of a feedback motor.
On the basis of a wire control steering system, a touch sensing technology is introduced into a steering wheel of a vehicle, and a correct and timely operation of a driver is assisted by touch feedback at the steering wheel, so that the wire control steering system is a feasible and effective man-machine interaction mode. The haptic guidance control technology in the teleoperation field is introduced into the operating device of the vehicle, a novel vehicle driving auxiliary system is developed, the force sense information prompt for the behavior of the driver is generated through the steering wheel when the vehicle is driven, the distraction of the driver is reduced, and therefore better driving decision consciousness of the driver is cultivated.
The use of haptic sensations in combination with auditory and visual aids to convey information to the driver can provide the driver with more efficient and less disturbing aids than based on auditory and visual aids driving techniques and is therefore considered one of the most optimal ways in many vehicle applications.
Through the intelligent man-machine interaction steering wheel device with touch perception, automobile driving auxiliary systems such as: the vehicle-mounted active safety system, the driving and reversing auxiliary system and the like can be more intelligent, efficient and safe.
Therefore, how to provide an intelligent steering wheel device and an application method capable of detecting vehicle conditions and road condition information, intelligent man-machine interaction and sensing with touch information is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the invention provides an intelligent man-machine interaction steering wheel device with touch perception and an application method thereof, which solve the problems mentioned in the background art section, and enable the steering wheel to have touch information perception capability, and also can combine road condition and vehicle speed information, thereby assisting reminding a driver, enabling man-machine interaction to be simpler and more intelligent, and having positive and important effects on promoting traffic safety.
In order to achieve the above purpose, the invention adopts the following technical scheme:
An intelligent human-computer interaction steering wheel device with touch perception comprises a steering wheel device, an ECU and a flexible perception layer; the flexible sensing layer is arranged on the steering wheel device, and the steering wheel device and the flexible sensing layer are respectively and electrically connected with the ECU;
The steering wheel device comprises a steering wheel, a coupler, a torque sensor, a rotation angle sensor, a feedback motor and a battery box; the battery box is fixedly connected with the steering wheel; the coupler is fixedly connected with a driving shaft of the feedback motor, and the coupler and the steering wheel are respectively connected with two ends of the transmission shaft; the torque sensor and the rotation angle sensor are arranged in the middle of the transmission shaft and are electrically connected with the ECU; the feedback motor is fixed with the frame through a supporting device and is electrically connected with the ECU;
The flexible sensing layer comprises a flexible substrate, a convex layer and a touch sensor; the flexible substrate is provided with a plurality of touch sensor mounting grooves, and the bulge layer is fixed on the upper end surface of the flexible substrate in a sealing way and forms a closed cavity with the touch sensor mounting grooves; the bottom of the touch sensor mounting groove is fixedly bonded with the touch sensors, and a plurality of the touch sensors form a touch sensor array; after the bulge layer is stressed, the bulge layer acts on the touch sensor array and the flexible substrate, the stressed touch sensor in the touch sensor array transmits a pressure signal to the ECU, and the ECU processes the signal to obtain grip strength distribution information;
The touch sensor comprises a protective layer, an upper circuit board, an upper electrode plate, a dielectric layer, a lower electrode plate, a lower circuit board and electrode wires; wherein, the protective layer and the lower circuit board form a containing cavity; the upper circuit board, the upper electrode plate, the dielectric layer and the lower electrode plate are all positioned in the accommodating cavity; the upper end face and the lower end face of the dielectric layer are correspondingly provided with the upper electrode plate and the lower electrode plate, the upper electrode plate and the lower electrode plate are correspondingly arranged on the upper circuit board and the lower circuit board, the upper electrode plate and the lower electrode plate are connected with the electrode wire, and the electrode wire is led out of the accommodating cavity;
The touch sensor is a capacitance sensor, and the stress change of the flexible sensing layer is detected according to a capacitance calculation formula C=epsilon S/d; when the outermost layer of the convex layer is subjected to external force, the normal force applied by the protective layer presses the upper circuit board and the dielectric layer, the dielectric layer is made of PDMS, the surface of the dielectric layer is provided with a groove microstructure and elastic characteristics, the upper electrode plate and the lower electrode plate are pressed to be close, the polar distance d is reduced, the capacitance is increased, and the electric signal is changed; the tangential force born by the protective layer can push the upper electrode plate to move horizontally relative to the lower electrode plate, so that the facing area S of the upper electrode plate and the lower electrode plate is reduced, the capacitance is reduced, and the electric signal change is caused; and the electric signals generated by the flexible sensing layer are transmitted to the ECU for processing through modulation and demodulation, so that the touch signals are obtained.
Preferably, in the above-mentioned intelligent human-computer interaction steering wheel device with touch perception, the battery box is embedded in a battery box bracket with a battery box mounting groove, and is connected with the flexible perception layer through the electrode lead; the battery box bracket is fixed with the steering wheel through screws.
Preferably, in the above-mentioned intelligent man-machine interaction steering wheel device with touch perception, the protective layer is the casing of being prepared by silica gel and bottom open-ended, has inertia and elasticity, the transmission of the pressure of being convenient for, reduces the interference, its surface be equipped with the antiskid pattern of protruding layer laminating increases to the adhesive force of protruding layer, the protective layer is through the mould of 3D printing technology preparation required shape, then prepares with the reverse mould method, is convenient for change shape.
Preferably, in the intelligent man-machine interaction steering wheel device with touch perception, the upper circuit board and the lower circuit board are made of polyimide, and the intelligent man-machine interaction steering wheel device has high thermal stability and heat resistance and excellent comprehensive performance.
Preferably, in the above-mentioned intelligent man-machine interaction steering wheel device with touch perception, the upper electrode plate and the lower electrode plate are copper foil layers plated on the surface layers of the upper circuit board and the lower circuit board through a flexible printed circuit board technology, and the intelligent man-machine interaction steering wheel device has the advantages of light weight, thin thickness, softness, flexibility, dynamic deflection, 3D three-dimensional installation, high reliability and strong heat dissipation.
Preferably, in the above-mentioned intelligent human-computer interaction steering wheel device with touch perception, the upper electrode plate with the lower electrode plate includes a plurality of spaced bar teeth and connects bar teeth's connecting plate, the upper electrode plate with the bar teeth of lower electrode plate are just to setting up one by one, and spaced bar teeth who distributes is favorable to improving polar plate area rate of change, and then improves sensitivity, the connecting plate passes through electrode wire is connected respectively battery case with ECU.
Preferably, in the above-mentioned intelligent human-computer interaction steering wheel device with touch perception, the preparation method of the dielectric layer is as follows: firstly, etching on a SiO2 substrate or a Si substrate by a photoetching technology to obtain an exposed silicon dioxide rectangular array; etching the exposed silicon dioxide by using hydrofluoric acid solution, and then washing off the photoresist to obtain an exposed silicon rectangular array; then, anisotropically etching the exposed silicon with hydrofluoric acid solution to obtain a silicon template with grooves; and finally, pouring a layer of PDMS on the surface of the silicon template, stripping off the PDMS after the PDMS is solidified, and obtaining the flexible PDMS film with the shape of a saw tooth slot, and carrying out segmentation treatment to obtain the dielectric layer with the grooves on the surface.
The application method of the intelligent human-computer interaction steering wheel device with touch perception comprises the steps that the ECU receives signals of a flexible perception layer, a vehicle speed sensor, a camera, a radar sensor, a torque sensor and a corner sensor which are installed on an automobile, performs algorithm analysis processing, and transmits torque simulation signals to the feedback motor to realize road feel simulation; transmitting the analysis result of the vehicle maintenance planning path to a multimedia display screen, a combination instrument and mobile equipment, and prompting;
The torque sensor and the rotation angle sensor collect torque and rotation angle information of a driver acting on the steering wheel, information is transmitted to the ECU, the ECU combines the simulated rotation angle and the torque information calculated by the vehicle speed sensor signal and compares the torque difference of the rotation angle input by the driver to construct feedback guidance for keeping a planned path of the vehicle running;
The vehicle speed sensor, the camera and the radar sensor receive external information of the vehicle and road condition information, the flexible perception layer receives touch signals of a driver, comprehensive calculation processing is carried out, the driver state is resolved, and a traveling path of the driving vehicle is planned; in the driving process, when road condition factors are eliminated and the touch signal detected by the flexible sensing layer is unchanged within preset time, the ECU sends out a prompt signal, and the multimedia display screen, the combination instrument and the mobile equipment prompt; the radar sensor and the camera monitor the road conditions at a far distance and a near distance, a travelling route is planned, an obstacle or a fork road appears in front of the radar sensor, the vehicle speed information of the vehicle speed sensor is combined for measurement and calculation, the flexible sensing layer does not sense a response touch signal in a safe distance, the ECU sends a prompt signal, and the multimedia display screen, the combination instrument and the mobile equipment prompt; when the car is in reverse operation, the speed and the obstacle information are combined, and the multimedia display screen, the combination instrument and the mobile equipment are monitored and prompted at the moment within the safe distance.
Compared with the prior art, the application discloses the intelligent human-computer interaction steering wheel device with the touch sense and the application method, wherein the touch sense sensor, the flexible substrate and the bulge layer form a flexible sensing layer; the steering wheel is sleeved with the steering wheel, so that the steering wheel has the touch sensing capability; the touch sensor has the advantages of compact structure, small volume and high sensitivity, can collect and accurately collect driving touch information of a driver, and combines external information collected by sensing devices such as a radar sensor, a camera, a vehicle speed sensor and the like arranged on a vehicle body to realize the intelligentization, the efficiency and the safety of human-computer interaction.
The invention transmits the signals after the calculation processing of the three information of touch sense, hearing sense and vision sense to the driver, can provide a more effective and less-interference auxiliary driving system for the driver, has great significance in improving traffic safety, solves the defects of low interaction efficiency, insufficient intelligent degree and low auxiliary safety driving capability caused by the human-computer interaction means by the hearing sense and the vision sense at present, and ensures that the human-computer interaction and the auxiliary safety driving are both intelligent, efficient and safe.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a structure of a flexible sensing layer;
FIG. 2 is a cross-sectional view of a tactile sensor;
FIG. 3 is an exploded view of the structure of the tactile sensor;
FIG. 4 is a control block diagram of the present invention;
Fig. 5 is an exploded view of a mounting structure of the flexible sensing layer on the steering wheel device.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. 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 embodiment of the invention discloses an intelligent human-computer interaction steering wheel device with touch perception and an application method thereof, which enable the steering wheel to have touch perception capability, can obtain touch change information of a driver, and is combined with a vehicle sensor, so that the state of the driver is judged, and the intelligent human-computer interaction steering wheel device plays an important positive role in assisting safe driving and traffic safety.
Referring to fig. 1-5, the invention relates to an intelligent man-machine interaction steering wheel device with touch perception, which comprises a steering wheel device, an ECU1 and a flexible perception layer 3; the flexible sensing layer 3 is arranged on the steering wheel device, and the steering wheel device and the flexible sensing layer 3 are respectively and electrically connected with the ECU 1;
The steering wheel device comprises a steering wheel 21, a coupler 24, a torque sensor 26, a rotation angle sensor 23, a feedback motor 25 and a battery box 28; wherein the battery box 28 is fixedly connected with the steering wheel 21; the coupler 22 is fixedly connected with a driving shaft of the feedback motor 25, and the coupler 24 and the steering wheel 21 are respectively connected with two ends of the transmission shaft 22; the torque sensor 26 and the rotation angle sensor 23 are arranged in the middle of the transmission shaft 22 and are electrically connected with the ECU 1; the feedback motor 25 is fixed with the frame through a supporting device and is electrically connected with the ECU 1;
The flexible sensing layer 3 includes a flexible substrate 31, a bump layer 33, and a tactile sensor 30; wherein, the flexible substrate 31 is provided with a plurality of touch sensor mounting grooves 32, the convex layer 33 is fixed on the upper end surface of the flexible substrate 31 in a sealing way, and forms a closed cavity together with the touch sensor mounting grooves 32; the bottom of the touch sensor mounting groove 32 is adhered and fixed with the touch sensors 30, and a plurality of touch sensors 30 form a touch sensor array; after the protruding layer 33 is stressed, the force acts on the touch sensor array and the flexible substrate 31, the stressed touch sensor 30 in the touch sensor array transmits a pressure signal to the ECU1, and the ECU1 processes the signal to obtain grip strength distribution information;
The tactile sensor 30 includes a protective layer 301, an upper circuit board 302, an upper electrode plate 303, a dielectric layer 304, a lower electrode plate 305, a lower circuit board 306, and an electrode lead 29; wherein, the protective layer 301 and the lower circuit board 306 form a containing cavity; the upper circuit board 302, the upper electrode board 303, the dielectric layer 304 and the lower electrode board 305 are positioned in the accommodating cavity, the upper end face and the lower end face of the dielectric layer 304 are correspondingly provided with the upper electrode board 303 and the lower electrode board 305, the upper electrode board 303 and the lower electrode board 305 are correspondingly arranged on the upper circuit board 302 and the lower circuit board 306, and the upper electrode board 303 and the lower electrode board 305 are connected with the electrode wire 29 and led out of the accommodating cavity;
The touch sensor 30 is a capacitive sensor, and detects the stress change of the flexible sensing layer 3 according to a capacitance calculation formula c=epsilon S/d; when the outermost protruding layer 33 is subjected to external force, the upper circuit board 302 and the dielectric layer 304 are pressed by the normal force applied to the protective layer 301, the dielectric layer 304 is made of PDMS (polydimethylsiloxane) and has microstructure and elastic characteristics, the upper electrode plate 303 and the lower electrode plate 305 are pressed close, the polar distance d is reduced, the capacitance is increased, and the electric signal is changed; the tangential force applied by the protective layer 301 pushes the upper electrode plate 303 to move horizontally relative to the lower electrode plate 305, so that the facing area S between the upper electrode plate 303 and the lower electrode plate 305 is reduced, the capacitance is reduced, and the electric signal change is caused; the electric signal generated by the flexible sensing layer 3 is transmitted to the ECU1 for processing through modulation and demodulation, and a touch signal is obtained.
In order to further optimize the technical scheme, the battery box 28 is embedded in the battery box bracket 27 with a battery box mounting groove and is connected with the flexible sensing layer 3 through the electrode lead 29; the battery case bracket 27 is fixed to the steering wheel 21 by screws.
In order to further optimize the above technical solution, the protective layer 301 is a shell made of silica gel and having an opening at the bottom, the surface of the shell is provided with an anti-slip pattern 3010 attached to the protruding layer 33, and the protective layer 301 is manufactured by a 3D printing technique to form a mold with a desired shape and then is manufactured by a reverse molding method.
To further optimize the above technical solution, the upper circuit board 302 and the lower circuit board 306 are made of polyimide.
In order to further optimize the above technical solution, the upper electrode plate 303 and the lower electrode plate 305 are copper foil layers plated on the surface layers of the upper circuit board 302 and the lower circuit board 305 by flexible printed circuit board technology.
In order to further optimize the above technical solution, the upper electrode plate 303 and the lower electrode plate 305 include a plurality of spaced bar-shaped teeth 3030 and connecting plates 3031 connecting the bar-shaped teeth, the bar-shaped teeth 3030 of the upper electrode plate 303 and the lower electrode plate 305 are disposed opposite to each other, and the connecting plates 3031 are respectively connected with the battery case 28 and the ECU1 through the electrode wires 29.
In order to further optimize the above technical solution, the preparation method of the dielectric layer 304 is as follows: firstly, etching on a SiO2 substrate or a Si substrate by a photoetching technology to obtain an exposed silicon dioxide rectangular array; etching the exposed silicon dioxide by using hydrofluoric acid solution, and then washing off the photoresist to obtain an exposed silicon rectangular array; then, anisotropically etching the exposed silicon with hydrofluoric acid solution to obtain a silicon template with grooves; and finally, pouring a layer of PDMS on the surface of the silicon template, stripping off the PDMS after the PDMS is solidified, and obtaining a flexible PDMS film with a saw tooth slot shape, and carrying out segmentation treatment to obtain the dielectric layer 304.
The application method of the intelligent human-computer interaction steering wheel device with touch perception comprises the steps that an ECU1 receives signals of a flexible perception layer 3, a vehicle speed sensor 4, a camera 5, a radar sensor 6, a torque sensor 26 and a corner sensor 23 which are installed on an automobile, performs algorithm analysis processing, and transmits torque simulation signals to a feedback motor 25 to realize road feel simulation; the analysis result of the vehicle planning path is sent to a multimedia display screen 7, a combination instrument 8 and a mobile device 9, and prompt is carried out;
the torque sensor 26 and the corner sensor 23 collect torque and corner information of a driver acting on the steering wheel 21 and transmit the information to the ECU1, and the ECU1 combines the simulated corner and torque information calculated by the signal of the vehicle speed sensor 4 and the torque difference of the driver operating input corner to compare, so as to construct feedback guidance for keeping the vehicle running along a planned path;
The vehicle speed sensor 4, the camera 5 and the radar sensor 6 receive external information and road condition information of the vehicle, the flexible perception layer 3 receives touch signals of a driver, comprehensive calculation processing is carried out, the driver state is resolved, and the running path of the driving vehicle is planned; in the driving process, when the road condition factors are eliminated and the touch signal detected by the flexible perception layer 3 is unchanged within the preset time, the ECU1 sends out a prompt signal, and the multimedia display screen 7, the combination instrument 8 and the mobile device 9 prompt; the radar sensor 6 and the camera 5 monitor the road conditions of long and short distances, a traveling route is planned, an obstacle or a fork road appears in front of the traveling route, the vehicle speed information of the vehicle speed sensor 4 is combined for measurement and calculation, the flexible perception layer 3 does not sense a response touch signal within a safe distance, the ECU1 sends a prompt signal, and the multimedia display screen 7, the combination instrument 8 and the mobile equipment 9 prompt; when the car is in reverse operation, the car speed and the obstacle information are combined, and the multimedia display screen 7, the combination instrument 8 and the mobile equipment 9 in the safe distance are monitored and prompted at all times.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. An intelligent human-computer interaction steering wheel device with touch perception is characterized by comprising a steering wheel device, an ECU and a flexible perception layer; the flexible sensing layer is arranged on the steering wheel device, and the steering wheel device and the flexible sensing layer are respectively and electrically connected with the ECU;
The steering wheel device comprises a steering wheel, a coupler, a torque sensor, a rotation angle sensor, a feedback motor and a battery box; the battery box is fixedly connected with the steering wheel; the coupler is fixedly connected with a driving shaft of the feedback motor, and the coupler and the steering wheel are respectively connected with two ends of the transmission shaft; the torque sensor and the rotation angle sensor are arranged in the middle of the transmission shaft and are electrically connected with the ECU; the feedback motor is fixed with the frame through a supporting device and is electrically connected with the ECU;
The flexible sensing layer comprises a flexible substrate, a convex layer and a touch sensor; the flexible substrate is provided with a plurality of touch sensor mounting grooves, and the bulge layer is fixed on the upper end surface of the flexible substrate in a sealing way and forms a closed cavity with the touch sensor mounting grooves; the bottom of the touch sensor mounting groove is fixedly bonded with the touch sensors, and a plurality of the touch sensors form a touch sensor array; after the bulge layer is stressed, the bulge layer acts on the touch sensor array and the flexible substrate, the stressed touch sensor in the touch sensor array transmits a pressure signal to the ECU, and the ECU processes the signal to obtain grip strength distribution information;
The touch sensor comprises a protective layer, an upper circuit board, an upper electrode plate, a dielectric layer, a lower electrode plate, a lower circuit board and electrode wires; wherein, the protective layer and the lower circuit board form a containing cavity; the upper circuit board, the upper electrode plate, the dielectric layer and the lower electrode plate are all positioned in the accommodating cavity; the upper end face and the lower end face of the dielectric layer are correspondingly provided with the upper electrode plate and the lower electrode plate, the upper electrode plate and the lower electrode plate are correspondingly arranged on the upper circuit board and the lower circuit board, the upper electrode plate and the lower electrode plate are connected with the electrode wire, and the electrode wire is led out of the accommodating cavity;
The touch sensor is a capacitance sensor, and the stress change of the flexible sensing layer is detected according to a capacitance calculation formula C=epsilon S/d; when the outermost layer of the convex layer is subjected to external force, the normal force applied by the protective layer presses the upper circuit board and the dielectric layer, the dielectric layer is made of PDMS, the surface of the dielectric layer is provided with a groove microstructure and elastic characteristics, the upper electrode plate and the lower electrode plate are pressed to be close, the polar distance d is reduced, the capacitance is increased, and the electric signal is changed; the tangential force born by the protective layer can push the upper electrode plate to move horizontally relative to the lower electrode plate, so that the facing area S of the upper electrode plate and the lower electrode plate is reduced, the capacitance is reduced, and the electric signal change is caused; the electric signals generated by the flexible sensing layer are transmitted to the ECU for processing through modulation and demodulation to obtain touch signals;
The preparation method of the dielectric layer comprises the following steps: firstly, etching on a SiO2 substrate or a Si substrate by a photoetching technology to obtain an exposed silicon dioxide rectangular array; etching the exposed silicon dioxide by using hydrofluoric acid solution, and then washing off the photoresist to obtain an exposed silicon rectangular array; then, anisotropically etching the exposed silicon with hydrofluoric acid solution to obtain a silicon template with grooves; finally, pouring a layer of PDMS on the surface of the silicon template, stripping off the PDMS after solidification, and obtaining a flexible PDMS film with a saw tooth slot shape, and carrying out segmentation treatment to obtain the dielectric layer with the grooves on the surface;
The application method of the intelligent man-machine interaction steering wheel device comprises the steps that the ECU receives signals of the flexible sensing layer, the vehicle speed sensor, the camera, the radar sensor, the torque sensor and the corner sensor which are installed on an automobile, performs algorithm analysis processing, and transmits torque simulation signals to the feedback motor to realize road feel simulation; transmitting the analysis result of the vehicle maintenance planning path to a multimedia display screen, a combination instrument and mobile equipment, and prompting;
The torque sensor and the rotation angle sensor collect torque and rotation angle information of a driver acting on the steering wheel, information is transmitted to the ECU, the ECU combines the simulated rotation angle and the torque information calculated by the vehicle speed sensor signal and compares the torque difference of the rotation angle input by the driver to construct feedback guidance for keeping a planned path of the vehicle running;
The vehicle speed sensor, the camera and the radar sensor receive external information of the vehicle and road condition information, the flexible perception layer receives touch signals of a driver, comprehensive calculation processing is carried out, the driver state is resolved, and a traveling path of the driving vehicle is planned; in the driving process, when road condition factors are eliminated and the touch signal detected by the flexible sensing layer is unchanged within preset time, the ECU sends out a prompt signal, and the multimedia display screen, the combination instrument and the mobile equipment prompt; the radar sensor and the camera monitor the road conditions at a far distance and a near distance, a travelling route is planned, an obstacle or a fork road appears in front of the radar sensor, the vehicle speed information of the vehicle speed sensor is combined for measurement and calculation, the flexible sensing layer does not sense a response touch signal in a safe distance, the ECU sends a prompt signal, and the multimedia display screen, the combination instrument and the mobile equipment prompt; when the car is in reverse operation, the speed and the obstacle information are combined, and the multimedia display screen, the combination instrument and the mobile equipment are monitored and prompted at the moment within the safe distance.
2. The intelligent human-computer interaction steering wheel device with touch perception according to claim 1, wherein the battery box is embedded in a battery box bracket with a battery box mounting groove and is connected with the flexible perception layer through the electrode lead; the battery box bracket is fixed with the steering wheel through screws.
3. The intelligent human-computer interaction steering wheel device with touch perception according to claim 1, wherein the protective layer is a shell which is made of silica gel and is provided with an opening at the bottom, an anti-slip pattern attached to the protruding layer is arranged on the surface of the shell, and the protective layer is manufactured into a mould with a required shape through a 3D printing technology and then manufactured by a reverse mould method.
4. The intelligent human-computer interaction steering wheel device with touch perception according to claim 1, wherein the upper circuit board and the lower circuit board are made of polyimide.
5. The intelligent man-machine interaction steering wheel device with touch perception according to claim 1 or 4, wherein the upper electrode plate and the lower electrode plate are copper foil layers plated on the surface layers of the upper circuit board and the lower circuit board through flexible printed circuit board technology.
6. The intelligent human-computer interaction steering wheel device with touch perception according to claim 5, wherein the upper electrode plate and the lower electrode plate comprise a plurality of strip-shaped teeth distributed at intervals and connecting plates connected with the strip-shaped teeth, the strip-shaped teeth of the upper electrode plate and the strip-shaped teeth of the lower electrode plate are arranged in a one-to-one opposite mode, and the connecting plates are respectively connected with the battery box and the ECU through electrode wires.
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| CN110667687B (en) * | 2019-10-23 | 2024-03-22 | 吉林大学 | Man-machine interaction intelligent steering wheel system with touch gesture recognition function |
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