Steering wheel, vehicle, steering wheel out-of-hand detection method and storage medium

Abstract

The invention relates to a steering control device, and discloses a steering wheel, a vehicle, a steering wheel out-of-hand detection method and a storage medium, the steering wheel comprises a framework, an outer surface layer, a heating layer, a sensing layer and a controller, and the outer surface layer covers the outer side of the framework; the heating layer is arranged between the framework and the outer surface layer; the induction layer is arranged between the heating layer and the outer surface layer; the controller is configured to receive a heating signal of the heating layer and a test capacitance value of the sensing layer, and adjust the test capacitance value to a compensation capacitance value according to the heating signal. A shielding layer does not need to be arranged in the steering wheel, the thickness of the steering wheel is reduced, the production cost of the steering wheel is reduced, the influence of heating of the steering wheel on the capacitance is compensated, the accuracy of capacitance detection is guaranteed, and hand leaving detection can be accurately conducted while the steering wheel can be heated.

Description

Technical Field

[0001] The invention relates to a steering control device, and in particular to a steering wheel, a vehicle, a steering wheel hands-off detection method and a storage medium. Background Art

[0002] With the development of intelligent driving technology, the degree of automation of vehicle driving is getting higher and higher. When the driver uses the intelligent driving function, it is necessary to determine whether the driver is holding the steering wheel to ensure that the driver can control the vehicle driving in time. When using capacitive sensors for steering wheel hands-off detection, a capacitive sensing layer and a shielding layer are generally set in the steering wheel. The shielding layer can reduce the influence of temperature on the capacitance value obtained by the capacitive sensing layer, but it increases the thickness of the steering wheel and increases the cost of using the steering wheel hands-off detection function. Therefore, a steering wheel with lower use cost is urgently needed. Summary of the invention

[0003] The object of the present invention is to provide a steering wheel, a vehicle, a steering wheel hands-off detection method and a storage medium to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0004] A steering wheel according to an embodiment of a first aspect of the present invention comprises: skeleton; An outer layer, covering the outer side of the frame; A heating layer is arranged between the frame and the outer surface layer; An induction layer is disposed between the heating layer and the outer surface layer; The controller is configured to receive the heating signal of the heating layer and the test capacitance value of the sensing layer, and adjust the test capacitance value to a compensation capacitance value according to the heating signal.

[0005] The technical solution has at least the following beneficial effects: the skeleton serves as the main supporting structure of the steering wheel to form the outer structure of the steering wheel; when in use, the heating function of the heating plate is realized by the heating layer, and the hands-off detection function of the heating plate is realized by the sensing layer; since the controller can receive the heating signal of the heating layer and the test capacitance value of the sensing layer, and adjust the test capacitance value according to the heating signal, the influence of the heating layer heating temperature rise on the test capacitance value is compensated; the compensated capacitance value thus obtained can more accurately feed back the capacitance information of the sensing layer for hands-off detection; thus, there is no need to set a shielding layer in the steering wheel, thus reducing the thickness of the steering wheel and the production cost of the steering wheel; the influence of the steering wheel heating on the capacitance is compensated, thus ensuring the accuracy of capacitance detection; the steering wheel can be heated and accurately detect hands-off at the same time.

[0006] According to some embodiments of the present invention, a first foaming layer is filled between the skeleton and the heating layer.

[0007] According to some embodiments of the present invention, a second foaming layer is filled between the sensing layer and the outer surface layer.

[0008] A vehicle according to an embodiment of the second aspect of the present invention includes a vehicle compartment, in which the above-mentioned steering wheel is installed.

[0009] This technical solution has at least the following beneficial effects: the driver uses this steering wheel to control the vehicle while driving. Since the steering wheel does not have a shielding layer, its thickness and occupied space are effectively reduced, thereby reducing the production cost of the steering wheel, and compensating for the influence of steering wheel heating on capacitance, thereby ensuring the accuracy of capacitance detection. The steering wheel can be heated and accurately detect the hand-off state, thereby better judging whether the driver is holding the steering wheel, which is conducive to improving driving safety.

[0010] A method for detecting hands-off steering wheel according to a third aspect of an embodiment of the present invention uses the above-mentioned steering wheel, including: Obtaining a corresponding relationship between the temperature of the steering wheel and the capacitance difference; Acquiring a heating signal and a test capacitance value of the steering wheel, and determining a surface temperature of the steering wheel according to the heating signal; Determine the capacitance difference corresponding to the surface temperature according to the corresponding relationship, and calculate the compensation capacitance value according to the test capacitance value and the capacitance difference corresponding to the surface temperature; It is determined whether the driver is holding the steering wheel according to the compensation capacitance value.

[0011] The technical solution has at least the following beneficial effects: in an environment where other conditions except temperature are the same, different temperatures will result in different capacitance values ​​tested by the sensing layer. Therefore, the difference in the corresponding changes in capacitance of the steering wheel at different temperatures is first obtained and recorded as the capacitance difference. The heating state of the steering wheel is determined according to the heating signal, and the surface temperature of the steering wheel at this time is determined thereby. The capacitance difference corresponding to the temperature at this time is obtained according to the surface temperature. The capacitance difference is used to compensate the capacitance value obtained from the current steering wheel test to obtain the compensated capacitance value. Since the compensated capacitance value compensates for the effect of steering wheel heating on capacitance, the accuracy of capacitance detection is guaranteed. At this time, the steering wheel can be heated and the hands-off detection can be accurately performed at the same time, thereby better judging whether the driver is holding the steering wheel, which is beneficial to improving driving safety.

[0012] According to some embodiments of the present invention, obtaining the correspondence between the temperature of the steering wheel and the capacitance difference includes: Acquire actual capacitance values ​​of the steering wheel at different temperature ranges, and acquire reference capacitance values ​​of the steering wheel at normal temperature; The difference between the actual capacitance value and the reference capacitance value is calculated to obtain the capacitance difference corresponding to the steering wheel in different temperature ranges.

[0013] According to some embodiments of the present invention, determining the capacitance difference corresponding to the surface temperature according to the corresponding relationship includes: Establishing a mathematical model of the steering wheel corresponding to different temperature ranges and capacitance differences; The temperature interval in which the surface temperature is located is input into the mathematical model to obtain the capacitance difference.

[0014] According to some embodiments of the present invention, the heating signal includes a heating function off signal, a temperature increase heating signal or a constant temperature heating signal, and obtaining the heating signal of the steering wheel includes: Obtain one of the heating function off signal, the temperature increase heating signal or the constant temperature heating signal.

[0015] According to some embodiments of the present invention, determining the surface temperature of the steering wheel according to the heating signal comprises: When the heating signal is a heating function off signal, the interior temperature of the vehicle where the steering wheel is located is obtained, and the interior temperature is recorded as the surface temperature.

[0016] According to some embodiments of the present invention, determining the surface temperature of the steering wheel according to the heating signal comprises: When the heating signal is a heating signal for obtaining the temperature rise, obtaining the interior temperature of the vehicle where the steering wheel is located and the heating time of the steering wheel; The actual temperature to which the steering wheel can be heated is determined according to the vehicle interior temperature and the heating time, and the actual temperature is recorded as the surface temperature.

[0017] According to some embodiments of the present invention, determining the surface temperature of the steering wheel according to the heating signal comprises: When the heating signal is the constant temperature heating signal, the target temperature reached by the steering wheel heating is obtained, and the target temperature is recorded as the surface temperature.

[0018] According to some embodiments of the present invention, the step of calculating the compensation capacitance value according to the capacitance difference between the test capacitance value and the surface temperature includes: The sum of the test capacitance value and the capacitance difference is recorded as the compensation capacitance value.

[0019] According to some embodiments of the present invention, judging whether the driver is holding the steering wheel according to the compensation capacitance value includes: Obtaining a preset capacitance threshold corresponding to the surface temperature, and determining whether the compensation capacitance value is within the preset capacitance threshold; When the compensation capacitance value is within the preset capacitance threshold, it is determined that the driver is holding the steering wheel.

[0020] A steering wheel hands-off detection device according to a fourth aspect of an embodiment of the present invention comprises: at least one processor; The memory stores instructions, and when the instructions are executed by at least one processor, the above-mentioned steering wheel hands-off detection method is executed.

[0021] A vehicle according to an embodiment of a fifth aspect of the present invention comprises the above-mentioned steering wheel hands-off detection device.

[0022] According to a sixth aspect of an embodiment of the present invention, a computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to execute the above-mentioned steering wheel hands-off detection method.

[0023] The technical solution has at least the following beneficial effects: the above-mentioned steering wheel hands-off detection method can be implemented as a computer program and tangibly contained in a computer-readable storage medium. When the processor uses this computer-readable storage medium to perform the steering wheel hands-off detection method, since the compensation capacitor value compensates for the effect of steering wheel heating on the capacitor, the accuracy of the capacitor detection is guaranteed. At this time, the steering wheel can be heated and the hands-off detection can be accurately performed at the same time, thereby better judging whether the driver is holding the steering wheel, which is conducive to improving driving safety.

[0024] A computer program product according to a seventh aspect of the present invention comprises a computer-readable storage medium as claimed in claim 1 .

[0025] The technical solution has at least the following beneficial effects: a method for detecting hands-off the steering wheel can be performed using this computer program product; since the compensation capacitance value compensates for the effect of steering wheel heating on capacitance, the accuracy of capacitance detection is guaranteed; at this time, the steering wheel can be heated and hands-off detection can be accurately performed at the same time, thereby better judging whether the driver is holding the steering wheel, which is beneficial to improving driving safety.

[0026] Additional aspects and advantages of the present invention will be described in part in the following description and will be apparent from the following description. This disclosure may be apparent or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly describes the drawings required for use in the description of the embodiments. Obviously, the drawings described are only part of the embodiments of the present invention, not all of the embodiments, and those skilled in the art can also obtain other design solutions and drawings based on these drawings without creative work.

[0028] Figure 1 It is a schematic diagram of the cross-sectional structure of the steering wheel of the present invention.

[0029] Figure 2 It is a flow chart of the method for detecting hands off the steering wheel of the present invention.

[0030] Figure 3 It is a flow chart of obtaining the corresponding relationship between the temperature and the capacitance difference of the steering wheel according to the present invention.

[0031] Figure 4 The present invention is a flow chart for determining the surface temperature of the steering wheel according to the heating signal.

[0032] In the figure: 100-skeleton, 200-outer surface layer, 310-heating layer, 320-induction layer. DETAILED DESCRIPTION

[0033] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0034] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0035] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0036] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0037] Reference Figure 1 According to a first aspect of the present invention, a steering wheel comprises a frame 100, an outer layer 200, a heating layer 310, a sensing layer 320 and a controller, wherein the heating layer 310 is arranged on the outer side of the frame 100, mainly used for heating, and can send out a heating signal, and the heating layer 310 can be bonded to the outer side of the frame 100 using a heating wire. In addition, the heating layer 310 can be wrapped around the outer periphery of the frame 100, or only arranged at a part of the outer side of the frame 100; the sensing layer 320 is arranged on the outer side of the heating layer 310, mainly used for capacitance The sensor is used for measurement and can send out the measured test capacitance value. The sensing layer 320 can be bonded to the outside of the heating layer 310 using conductive cloth. In practical applications, the sensing layer 320 and the heating layer 310 can be composited into a whole using a substrate. The substrate can be made of PE material. During production, the sensing layer 320 and the heating layer 310 are directly wrapped around the outside of the skeleton 100 as a whole. The controller is configured to receive the heating signal of the heating layer 310 and the test capacitance value of the sensing layer 320, and adjust the test capacitance value to the compensation capacitance value according to the heating signal.

[0038] As can be seen from the above, the skeleton 100 serves as the main supporting structure of the steering wheel and forms the outer structure of the steering wheel. When in use, the heating function of the heating plate is realized by the heating layer 310, and the hand-off detection function of the heating plate is realized by the sensing layer 320. Since the controller can receive the heating signal of the heating layer 310 and the test capacitance value of the sensing layer 320, and adjust the test capacitance value according to the heating signal, it compensates for the influence of the heating layer 310 heating up on the test capacitance value. The compensated capacitance value thus obtained can more accurately feedback the capacitance information of the sensing layer 320 for hand-off detection. In this way, there is no need to set a shielding layer in the steering wheel, which reduces the thickness of the steering wheel and the production cost of the steering wheel. It also compensates for the influence of the steering wheel heating on the capacitance, thereby ensuring the accuracy of capacitance detection. The steering wheel can be heated and accurately detect hand-off at the same time.

[0039] Since the frame 100 is made of metal and has an irregular shape, it is difficult to closely connect and fit the heating layer 310 when it is directly wrapped on the outside of the frame 100. In order to improve the effect of the heating layer 310 wrapping on the outside of the frame 100, in this embodiment, a first foaming layer is filled between the frame 100 and the heating layer 310. In this way, a foaming structure is arranged on the outside of the frame 100 during production to form a regular foaming layer, and then the heating layer 310 is wrapped on the outside of the foaming layer, which can effectively improve production efficiency and quality.

[0040] In order to improve the flatness of the outer layer 200, in this embodiment, a second foaming layer is filled between the sensing layer 320 and the outer layer 200. Similarly, during production, a foaming structure is first set on the outside of the skeleton 100 to form another regular foaming layer, and then the outer layer 200 is coated on the outside of the second foaming layer, so that the outer layer 200 is more closely attached to the internal structure during molding, thereby improving production efficiency and quality. In practical applications, the outer layer 200 can be made of leather or other materials. For example, the entire outer layer 200 is a single-color leather, or a two-color leather composed of two different colors.

[0041] A vehicle according to an embodiment of the second aspect of the present invention includes a compartment in which the above-mentioned steering wheel is installed. The vehicle can be a private car, such as a sedan, SUV, MPV or pickup truck. The vehicle can also be an operating vehicle, such as a van, bus, small truck or large trailer. The vehicle needs to have an electric motor that can output power or store mechanical energy as a generator. When the vehicle is a new energy vehicle, it can be a hybrid vehicle or a pure electric vehicle.

[0042] The driver uses this steering wheel to control the vehicle while driving. Since the steering wheel does not have a shielding layer, its thickness and occupied space are effectively reduced, the production cost of the steering wheel is reduced, and the influence of steering wheel heating on capacitance is compensated, thereby ensuring the accuracy of capacitance detection. The steering wheel can be heated and accurately detect hand-off at the same time, thereby better judging whether the driver is holding the steering wheel, which is conducive to improving driving safety.

[0043] According to a third aspect of the present invention, a method for detecting hands-off steering wheel is provided, using the above-mentioned steering wheel, such as Figure 2 As shown, including but not limited to the following steps: Step S100, obtaining the corresponding relationship between the temperature of the steering wheel and the capacitance difference. Different temperatures will affect the capacitance value tested by the sensing layer 320, so it is necessary to first obtain the capacitance difference tested by the sensing layer 320 at different temperatures to compensate for the capacitance value actually tested later.

[0044] Step S200, obtaining the heating signal and the test capacitance value of the steering wheel, and determining the surface temperature of the steering wheel according to the heating signal. The heating state of the steering wheel can be determined according to the heating signal of the steering wheel, thereby determining the surface temperature of the steering wheel, and obtaining the test capacitance value measured by the current sensing layer 320. This test capacitance value is affected by the heating temperature and needs to be compensated.

[0045] Step S300, determine the capacitance difference corresponding to the surface temperature according to the corresponding relationship, and calculate the compensation capacitance value according to the capacitance difference between the test capacitance value and the surface temperature. According to the current surface temperature of the steering wheel, the capacitance difference corresponding to the temperature can be obtained in step S100, and the capacitance value obtained by the current steering wheel test can be compensated by using this capacitance difference, so as to compensate for the influence of the steering wheel heating on the capacitance, thereby ensuring the accuracy of the hand-off detection under the setting of reducing the shielding layer.

[0046] Step S400, judging whether the driver is holding the steering wheel according to the compensation capacitance value. Due to the influence of the compensation heating on the capacitance value, the accuracy of judging whether the driver is holding the steering wheel is effectively improved.

[0047] From the above, it can be seen that under an environment where other conditions except temperature are the same, different temperatures will also cause different capacitance values ​​tested by the sensing layer 320. Therefore, the difference in the corresponding changes in the capacitance of the steering wheel at different temperatures is first obtained, recorded as the capacitance difference, and the heating state of the steering wheel is determined according to the heating signal, and the surface temperature of the steering wheel at this time is determined thereby, and the capacitance difference corresponding to the temperature at this time is obtained according to the surface temperature, and the capacitance difference is used to compensate the capacitance value obtained by the current steering wheel test to obtain the compensated capacitance value. Since the compensated capacitance value compensates for the effect of steering wheel heating on the capacitance, the accuracy of capacitance detection is guaranteed. At this time, the steering wheel can be heated and the hands-off detection can be accurately performed at the same time, thereby better judging whether the driver is holding the steering wheel, which is beneficial to improving driving safety.

[0048] In step S100, the corresponding relationship between the temperature of the steering wheel and the capacitance difference is obtained, such as Figure 3 As shown, including but not limited to the following steps: Step S110, obtaining the actual capacitance value of the steering wheel at different temperature intervals and the reference capacitance value of the steering wheel at room temperature. Within the same temperature range of the steering wheel, different temperature values ​​have little effect on the capacitance. Therefore, the temperature for testing the capacitance value of the sensing layer 320 is divided into multiple intervals, and the actual capacitance values ​​at different temperature intervals are measured. The capacitance value obtained by the steering wheel at room temperature is used as a reference benchmark and recorded as the reference capacitance value.

[0049] Step S120, calculating the difference between the actual capacitance value and the reference capacitance value, and obtaining the capacitance difference corresponding to the steering wheel at different temperature intervals. By setting the capacitance difference corresponding to multiple temperature intervals, a lot of work for testing the capacitance difference corresponding to the steering wheel at different temperature values ​​can be reduced, and the efficiency of subsequent detection operations can be improved.

[0050] For example, the temperature is divided into 6 temperature ranges: -40~-20℃, -20~0℃, 0~20℃, 20~40℃, 40~60℃, 60~80℃. The capacitance is obtained respectively. When the steering wheel is not touched, the basic capacitance value C of each temperature range is obtained. -40~-20 , C -20~0 , C 0~20 , C, C 40~60 , C 60~80 In addition, the capacitance value obtained in the temperature range of 20~40℃ is used as the reference capacitance value, and the change △ of the capacitance threshold of each temperature range relative to the reference temperature 20~40℃ is calculated respectively. Taking the capacitance difference of -40~-20℃ as an example, △=C -40~-20 -C.

[0051] In step S300, the capacitance difference corresponding to the surface temperature is determined according to the corresponding relationship, including but not limited to the following steps: Step S310, establishing a mathematical model of the steering wheel corresponding to different temperature ranges and capacitance differences. According to the capacitance differences corresponding to the steering wheel in different temperature ranges obtained in step S120, they can be mutually matched and a mathematical model can be established, thereby facilitating the subsequent corresponding temperature to obtain the capacitance difference.

[0052] Step S320, input the temperature interval where the surface temperature is located into the mathematical model to obtain the capacitance difference. The temperature interval where the surface temperature is located is determined by the surface temperature, and the temperature interval is input into the mathematical model about the correspondence between different temperature intervals and capacitance differences to obtain the capacitance difference corresponding to the temperature interval, thereby determining the compensation amount required for the capacitance value sensed by the steering wheel.

[0053] In step S200, the heating signal includes a heating function off signal, a temperature increase heating signal or a constant temperature heating signal, and obtaining the heating signal of the steering wheel includes but is not limited to the following steps: obtaining one of the heating function off signal, the temperature increase heating signal or the constant temperature heating signal. There are multiple states of steering wheel heating. When the obtained heating signal is a heating function off signal, the heating function of the steering wheel is not enabled at this time; when the obtained heating signal is a temperature increase heating signal, the heating function of the steering wheel is turned on at this time, but the steering wheel is still in the stage of continuous temperature increase heating and has not reached the set target temperature; when the obtained heating signal is a constant temperature heating signal, the steering wheel is heated to a constant temperature state, and the steering wheel has reached the set target temperature and does not need to continue to heat up.

[0054] It can be seen that when the heating signal is different, the confirmation of the steering wheel surface temperature in step S200 is also different, such as Figure 4 As shown in the first embodiment, when the heating function off signal is obtained, determining the surface temperature of the steering wheel according to the heating signal includes but is not limited to the following steps: Step S210, obtaining the temperature inside the vehicle where the steering wheel is located, and recording the temperature inside the vehicle as the surface temperature. Since the steering wheel is not heated, the temperature on the surface of the steering wheel is the temperature of the interior space of the vehicle where the steering wheel is located, and therefore, the temperature inside the vehicle is used as the surface temperature of the steering wheel.

[0055] As a second embodiment, when a heating signal is obtained, determining the surface temperature of the steering wheel according to the heating signal includes but is not limited to the following steps: Step S221, obtaining the temperature inside the vehicle where the steering wheel is located and the heating time of the steering wheel. At this time, the steering wheel is in a stage of continuous heating, and the heating effect of the steering wheel is affected by the temperature inside the vehicle and the heating time of the steering wheel. Therefore, it is necessary to obtain the temperature inside the vehicle and the heating time of the steering wheel at this time to better judge the temperature that the steering wheel surface can reach at this time.

[0056] Step S222, determining the actual temperature that the steering wheel can reach by heating according to the vehicle interior temperature and the heating time, and recording the actual temperature as the surface temperature. In actual applications, the steering wheel will be heated at different vehicle interior temperatures, the temperature values ​​at different times will be recorded, and a corresponding mathematical model will be established. In this way, during actual testing, the vehicle interior temperature and the heating time of the steering wheel will be input into the mathematical model to obtain the corresponding temperature.

[0057] As a third embodiment, when a constant temperature heating signal is obtained, determining the surface temperature of the steering wheel according to the heating signal includes: Step S230, obtaining the target temperature reached by the steering wheel heating, and recording the target temperature as the surface temperature. When the steering wheel is heated, it will generally rise to the required temperature, and its surface temperature will not continue to rise. At this time, the target temperature can be recorded as the surface temperature of the steering wheel, thereby determining the compensation amount required for the steering wheel detection capacitance value at this time.

[0058] After determining that the compensation amount of the capacitance value of the steering wheel needs to be measured at this time, in step S300, the compensation capacitance value is calculated according to the test capacitance value and the capacitance difference, including but not limited to the following steps: the sum of the test capacitance value and the capacitance difference is recorded as the compensation capacitance value. 补偿 =C 测试 +△, where C 测试 is the capacitance value displayed during the actual test of the steering wheel, and △ is the capacitance difference obtained in step S120. The compensation capacitance value calculated by directly adding the test capacitance value to the capacitance difference compensates for the influence of temperature on the capacitance value. Therefore, the capacitance value required for hand-off detection can be accurately obtained even without the shielding layer.

[0059] In step S400, judging whether the driver is holding the steering wheel according to the compensation capacitance value includes but is not limited to the following steps: Step S410, obtain the preset capacitance threshold corresponding to the surface temperature, and determine whether the compensation capacitance value is within the preset capacitance threshold. Since the capacitance value is affected by temperature, the capacitance threshold for judging the hand-off detection using capacitance is also different under different temperature conditions. In practical applications, different capacitance thresholds are set in different temperature ranges. When performing hand-off detection, the preset capacitance threshold corresponding to the steering wheel surface temperature is obtained, and the preset capacitance threshold is used to compare with the compensation capacitance value.

[0060] When the compensation capacitance value is within the preset capacitance threshold, the process proceeds to step S420 to determine that the driver is holding the steering wheel. When the compensation capacitance value exceeds the preset capacitance threshold, the process proceeds to step S430 to determine that the driver is not holding the steering wheel. When the driver's hand touches or leaves the steering wheel, the capacitance value measured by the sensing value will change. By comparing the compensation capacitance value with the preset capacitance threshold, it is possible to determine whether the driver is holding the steering wheel and complete the hand-off detection of the steering wheel.

[0061] A steering wheel hands-off detection device according to a fourth aspect of an embodiment of the present invention comprises: at least one processor; The memory stores instructions, and when the instructions are executed by at least one processor, the above-mentioned steering wheel hands-off detection method is executed.

[0062] Take the example that the processor and memory in the vehicle control device can be connected through a bus. The memory, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer executable programs. In addition, the memory may include a high-speed random access memory, and may also include a non-transitory memory, such as at least one disk memory, a flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory may optionally include a memory remotely arranged relative to the control processor, and these remote memories may be connected to the control device via a network.

[0063] A vehicle according to a fifth embodiment of the present invention includes the above-mentioned steering wheel hands-off detection device. Since the vehicle applies all technical solutions of the above-mentioned vehicle control device, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0064] According to a computer-readable storage medium of an embodiment of the sixth aspect of the present invention, the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to execute the above-mentioned steering wheel hands-off detection method.

[0065] The above-mentioned steering wheel hands-off detection method can be implemented as a computer program and tangibly included in a computer-readable storage medium. When the processor uses this computer-readable storage medium to perform the steering wheel hands-off detection method, since the compensation capacitor value compensates for the effect of steering wheel heating on the capacitor, the accuracy of the capacitor detection is guaranteed. At this time, the steering wheel can be heated and the hands-off detection can be accurately performed at the same time, thereby better judging whether the driver is holding the steering wheel, which is conducive to improving driving safety.

[0066] A computer program product according to an embodiment of the seventh aspect of the present invention comprises a computer-readable storage medium as claimed in claim 1. The computer program product comprises a computer program or a computer instruction, the computer program or the computer instruction is stored in a computer-readable storage medium, a processor of a computer device reads the computer program or the computer instruction from the computer-readable storage medium, and the processor executes the computer program or the computer instruction, so that the computer device executes the above-mentioned steering wheel hand-off detection method.

[0067] This computer program product can be used to perform a steering wheel hands-off detection method. Since the compensation capacitor value compensates for the effect of steering wheel heating on the capacitor, the accuracy of capacitor detection is guaranteed. At this time, the steering wheel can be heated and hands-off detection can be accurately performed at the same time, thereby better judging whether the driver is holding the steering wheel, which is beneficial to improving driving safety.

[0068] It will be appreciated by those skilled in the art that all or some of the steps and systems in the methods disclosed above may be implemented as software, firmware, hardware, and appropriate combinations thereof. Some or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or non-transitory medium) and a communication medium (or transient medium). As known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically include computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0069] An embodiment of the present invention further provides a vehicle control device, comprising a memory, a processor, and a program stored in the memory and executable on the processor, wherein the program, when executed by the processor, implements the steering wheel hands-off detection method of the above embodiment.

[0070] Take the example that the processor and memory in the vehicle control device can be connected through a bus. The memory, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer executable programs. In addition, the memory may include a high-speed random access memory, and may also include a non-transitory memory, such as at least one disk memory, a flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory may optionally include a memory remotely arranged relative to the control processor, and these remote memories may be connected to the control device via a network.

[0071] The device embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separated, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0072] The preferred embodiments of the present invention are specifically described above, but the invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A steering wheel, characterized in that: include: skeleton(100); An outer layer (200) covering the outer side of the frame (100); A heating layer (310) is disposed between the frame (100) and the outer surface layer (200); An induction layer (320) is disposed between the heating layer (310) and the outer surface layer (200); The controller is configured to receive a heating signal of the heating layer (310) and a test capacitance value of the sensing layer (320), and adjust the test capacitance value to a compensation capacitance value according to the heating signal.

2. A steering wheel according to claim 1, characterized in that: A first foaming layer is filled between the skeleton (100) and the heating layer (310).

3. A steering wheel according to claim 1, characterized in that: A second foaming layer is filled between the sensing layer (320) and the outer surface layer (200).

4. A vehicle, characterized in that: The invention comprises a vehicle compartment in which a steering wheel as claimed in any one of claims 1 to 3 is installed.

5. A method for detecting hands-off steering wheel, characterized in that: Use of the steering wheel according to any one of claims 1 to 3, comprising: Obtaining a corresponding relationship between the temperature of the steering wheel and the capacitance difference; Acquiring a heating signal and a test capacitance value of the steering wheel, and determining a surface temperature of the steering wheel according to the heating signal; Determine the capacitance difference corresponding to the surface temperature according to the corresponding relationship, and calculate the compensation capacitance value according to the test capacitance value and the capacitance difference corresponding to the surface temperature; It is determined whether the driver is holding the steering wheel according to the compensation capacitance value.

6. A method for detecting hands-off steering wheel according to claim 5, characterized in that: The obtaining the corresponding relationship between the temperature of the steering wheel and the capacitance difference includes: Acquire actual capacitance values ​​of the steering wheel at different temperature ranges and a reference capacitance value of the steering wheel at normal temperature; The difference between the actual capacitance value and the reference capacitance value is calculated to obtain the capacitance difference corresponding to the steering wheel in different temperature ranges.

7. The method for detecting hands-off steering wheel according to claim 6, characterized in that: The determining the capacitance difference corresponding to the surface temperature according to the corresponding relationship includes: Establishing a mathematical model of the steering wheel corresponding to different temperature ranges and capacitance differences; The temperature interval in which the surface temperature is located is input into the mathematical model to obtain the capacitance difference.

8. The method for detecting hands-off steering wheel according to claim 5, characterized in that: The heating signal includes a heating function off signal, a temperature increase heating signal or a constant temperature heating signal, and the step of obtaining the heating signal of the steering wheel includes: Obtain one of the heating function off signal, the temperature increase heating signal or the constant temperature heating signal.

9. The method for detecting hands-off steering wheel according to claim 8, characterized in that: Determining the surface temperature of the steering wheel according to the heating signal comprises: When the heating signal is a heating function off signal, the interior temperature of the vehicle where the steering wheel is located is obtained, and the interior temperature is recorded as the surface temperature.

10. The method for detecting hands-off steering wheel according to claim 8, characterized in that: Determining the surface temperature of the steering wheel according to the heating signal comprises: When the heating signal is the temperature-increasing heating signal, obtaining the interior temperature of the vehicle where the steering wheel is located and the heating time of the steering wheel; The actual temperature to which the steering wheel can be heated is determined according to the vehicle interior temperature and the heating time, and the actual temperature is recorded as the surface temperature.

11. The method for detecting hands-off steering wheel according to claim 8, characterized in that: Determining the surface temperature of the steering wheel according to the heating signal comprises: When the heating signal is the constant temperature heating signal, the target temperature reached by the steering wheel heating is obtained, and the target temperature is recorded as the surface temperature.

12. The method for detecting hands-off steering wheel according to claim 5, characterized in that: The calculating the compensation capacitance value according to the capacitance difference between the test capacitance value and the surface temperature includes: The sum of the test capacitance value and the capacitance difference is recorded as the compensation capacitance value.

13. The method for detecting hands-off steering wheel according to claim 5, characterized in that: The determining whether the driver is holding the steering wheel according to the compensation capacitance value includes: Obtaining a preset capacitance threshold corresponding to the surface temperature, and determining whether the compensation capacitance value is within the preset capacitance threshold; When the compensation capacitance value is within the preset capacitance threshold, it is determined that the driver is holding the steering wheel.

14. A steering wheel hands-off detection device, comprising: at least one processor; A memory storing instructions, which, when executed by at least one processor, executes the steering wheel hands-off detection method described in any one of claims 5 to 13.

15. A vehicle, characterized in that: It includes the steering wheel hands-off detection device as described in claim 14.

16. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to execute the steering wheel hands-off detection method according to any one of claims 5 to 13.

17. A computer program product, characterized in that: Comprising the computer-readable storage medium of claim 16.

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