Signal conversion system and method for wireless sensors
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CONTINENTAL AUTOMOTIVE SYST CHANGCHUN CO LTD
- Filing Date
- 2024-12-17
- Publication Date
- 2026-06-26
Smart Images
Figure CN122293679A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of electric vehicle technology, and in particular to a signal conversion system and method for a wireless sensor. Background Technology
[0002] Sensors are crucial sensing devices in vehicles. Different sensors detect different data; for example, wheel speed sensors monitor vehicle speed, acceleration sensors monitor changes in speed, height sensors monitor changes in the vehicle's chassis, and distance sensors monitor the distance between the vehicle and its surroundings. With the rapid development of assisted driving and autonomous driving, the role of sensors as the vehicle's "eyes" has become particularly important. Errors or inaccuracies in the acquired data can easily lead to incorrect judgments by the vehicle control system, resulting in flawed driving strategies and compromising vehicle safety. Therefore, these sensors must meet requirements for reliability and stability.
[0003] To improve the safety of autonomous driving, vehicle design requires similar sensors to be designed with dual redundancy. Using wired connections would increase the number of wiring harnesses many times over, making wiring more difficult. Moreover, two independent sensors cannot exchange information or diagnose each other, resulting in poor reliability of the output signal. Summary of the Invention
[0004] The purpose of this invention is to propose a signal conversion system and method for wireless sensors, which solves the above-mentioned technical problems by acquiring wheel speed signals from multiple sources, performing comprehensive diagnosis, and then outputting the signals wirelessly.
[0005] According to a first aspect of the present invention, a signal conversion system for a wireless sensor is provided, comprising: a programmable logic device (CPLD) chip, a first wheel speed sensor, a second wheel speed sensor, a signal processing module, and a wireless transmission module;
[0006] The input terminal of the signal processing module is connected to the first wheel speed sensor and the second wheel speed sensor respectively, and the output terminal of the signal processing module is connected to the CPLD chip;
[0007] The output terminal of the CPLD chip is connected to the wireless transmission module;
[0008] The CPLD chip performs a diagnosis based on the wheel speed signal processed by the signal processing module, and sends the diagnosis result to the receiving end through the wireless transmission module.
[0009] This invention achieves a flexible, efficient, and low-latency system design using a CPLD chip, solving the problems of low automotive-grade communication speed, complex peripheral circuits, and high chip cost.
[0010] A further improvement of the signal conversion system of the wireless sensor of the present invention is that the signal processing module includes a first signal separation module, the input end of the first signal separation module is connected to the first wheel speed sensor, the output end of the first signal separation module is connected to the CPLD chip, and the first signal separation module is used to separate the speed pulse and data protocol bit information of the wheel speed signal of the first wheel speed sensor and send them to the CPLD chip.
[0011] A further improvement of the signal conversion system of the wireless sensor of the present invention is that the signal processing module includes a second signal separation module, the input end of the second signal separation module is connected to the second wheel speed sensor, the output end of the second signal separation module is connected to the CPLD chip, and the second signal separation module is used to separate the speed pulse and data protocol bit information of the wheel speed signal of the second wheel speed sensor and send them to the CPLD chip.
[0012] A further improvement of the signal conversion system of the wireless sensor of the present invention is that the signal processing module further includes a digital-to-analog converter. The input terminal of the digital-to-analog converter is connected to the first wheel speed sensor and the second wheel speed sensor respectively, and the output terminal of the digital-to-analog converter is connected to the CPLD chip. The digital-to-analog converter is used to convert the wheel speed signals of the first wheel speed sensor and the second wheel speed sensor into digital signals and send the digital signals to the CPLD chip.
[0013] A further improvement of the signal conversion system of the wireless sensor of the present invention is that the CPLD chip is configured to: acquire the first wheel speed signal of the first wheel speed sensor and the second wheel speed signal of the second wheel speed sensor respectively, compare the first wheel speed signal and the second wheel speed signal, calculate the signal delay difference, compare the calculated signal delay difference with the reference delay difference, obtain the diagnostic information of the wheel speed signal based on the comparison result and combined with the digital signal of the digital-to-analog converter, and send the diagnostic information to the receiving end through the wireless transmission module.
[0014] A further improvement of the signal conversion system of the wireless sensor of the present invention is that the second wheel speed sensor is also connected to the chassis component via a data cable, and the data cable is provided with a filtering and shaping module.
[0015] A further improvement of the signal conversion system of the wireless sensor of the present invention is that the signal conversion system of the wireless sensor further includes a gyroscope, which is connected to the CPLD chip via SPI.
[0016] A further improvement of the signal conversion system of the wireless sensor of the present invention is that the signal conversion system of the wireless sensor further includes an accelerometer and a digital-to-analog converter, the input terminal of the digital-to-analog converter is connected to the accelerometer, and the output terminal of the digital-to-analog converter is connected to the CPLD chip via SPI.
[0017] According to a second aspect of the present invention, a signal conversion method for a wireless sensor is provided, applied to the signal conversion system of the wireless sensor described in any one of the above embodiments, the method comprising:
[0018] The first wheel speed signal from the first wheel speed sensor and the second wheel speed signal from the second wheel speed sensor are acquired respectively.
[0019] The first wheel speed signal and the second wheel speed signal are processed;
[0020] Diagnose the wheel speed signals based on the processed first wheel speed signal and second wheel speed signal;
[0021] The diagnostic results are transmitted wirelessly to the vehicle receiver.
[0022] A further improvement of the signal conversion method for the wireless sensor of the present invention is that the processing of the first wheel speed signal and the second wheel speed signal includes:
[0023] The first wheel speed signal and the second wheel speed signal are separated according to the data protocol.
[0024] A further improvement to the signal conversion method for the wireless sensor of the present invention is that the step of diagnosing the wheel speed signal based on the processed first wheel speed signal and the second wheel speed signal includes:
[0025] Compare signals of the same type and calculate the signal delay difference;
[0026] Compare the calculated signal delay difference with the reference delay difference;
[0027] Diagnostic information about the wheel speed signal is obtained based on the comparison results.
[0028] A further improvement to the signal conversion method of the wireless sensor of the present invention is that it further includes:
[0029] The first wheel speed signal and the second wheel speed signal are obtained again through another line;
[0030] The first wheel speed signal and the second wheel speed signal are converted into digital signals respectively;
[0031] The digital signal is combined with the comparison result of the calculated signal delay difference and the reference delay difference to obtain diagnostic information of the wheel speed signal.
[0032] The wireless sensor signal conversion system and method provided by this invention acquires wheel speed signals from multiple sources, processes and diagnoses the acquired wheel speed signals, and then transmits them to the receiving end through a wireless transmission module. This invention achieves a flexible, efficient, and low-latency system design through a CPLD chip, solving the problems of low communication speed, complex peripheral circuits, and high chip cost in automotive-grade applications. Attached Figure Description
[0033] The present invention will now be described in detail with reference to the accompanying drawings and exemplary embodiments, wherein:
[0034] Figure 1 This diagram shows a structural block diagram of a signal conversion system for a wireless sensor according to an embodiment of the present invention.
[0035] Figure 2 A flowchart illustrating a signal conversion method for a wireless sensor according to an embodiment of the present invention is shown.
[0036] The accompanying drawings are merely illustrative and not necessarily drawn to scale. Furthermore, they only show those parts necessary to illustrate the invention, while other parts may be omitted or simply mentioned. That is, the invention may include other parts besides those shown in the drawings. Detailed Implementation
[0037] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Although the description of the present invention is presented in conjunction with preferred embodiments, this does not mean that the features of the invention are limited to these embodiments. On the contrary, the purpose of describing the invention in conjunction with embodiments is to cover other options or modifications that may be derived based on the claims of the present invention. To provide a deep understanding of the invention, many specific details will be included in the following description. The invention may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of the invention, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.
[0038] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0039] In the description of this embodiment, it should be noted that the terms "upper" and "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use. They 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, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.
[0040] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.
[0041] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.
[0042] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
[0043] Figure 1 This diagram illustrates the structural block diagram of a signal conversion system for a wireless sensor according to an embodiment of the present invention.
[0044] Reference Figure 1 The signal conversion system of the wireless sensor in this embodiment of the invention includes: a CPLD (Complex Programmable Logic Device) controller 10, a first wheel speed sensor 30, a second wheel speed sensor 40, a signal processing module 20, and a wireless transmission module 50.
[0045] The input terminals of the signal processing module 20 are connected to the first wheel speed sensor 30 and the second wheel speed sensor 40, respectively. The output terminal of the signal processing module 20 is connected to the CPLD chip 10, and the output terminal of the CPLD chip 10 is connected to the wireless transmission module 50. The signal processing module 20 processes the wheel speed signals from the first wheel speed sensor 30 and the second wheel speed sensor 40, and then sends them to the CPLD chip 10. The CPLD chip 10 performs diagnostics based on the processed wheel speed signals from the signal processing module 20 and sends the diagnostic results to the receiving end via the wireless transmission module 50. The receiving end is a controller on the vehicle, such as a domain controller or a vehicle controller. The receiving end determines whether the first wheel speed sensor 30 and the second wheel speed sensor 40 are working properly based on the diagnostic results.
[0046] In one embodiment, the signal processing module 20 includes a first signal separation module 21 for processing the wheel speed signal from the first wheel speed sensor 30. The input terminal of the first signal separation module 21 is connected to the first wheel speed sensor 30, and the output terminal of the first signal separation module 21 is connected to the CPLD chip 10. The first signal separation module 21 separates the speed pulse and data protocol bit information of the wheel speed signal from the first wheel speed sensor 30 and sends them to the CPLD chip 10. The first signal separation module 21 includes a combination of circuits such as a comparator, an amplifier, and a filter circuit.
[0047] Correspondingly, the signal processing module 20 includes a second signal separation module 22 for processing the wheel speed signal from the second wheel speed sensor 40. The input terminal of the second signal separation module 22 is connected to the second wheel speed sensor 40, and the output terminal is connected to the CPLD chip 10. The second signal separation module 22 separates the speed pulse and data protocol bit information of the wheel speed signal from the second wheel speed sensor 40 and sends them to the CPLD chip 10. The second signal separation module 22 includes a combination of circuits such as a comparator, amplifier, and filter circuit.
[0048] Furthermore, the signal processing module 20 also includes a digital-to-analog converter 23. The input terminal of the digital-to-analog converter 23 is connected to the first wheel speed sensor 30 and the second wheel speed sensor 40, respectively. The output terminal of the digital-to-analog converter 23 is connected to the CPLD chip 10. The digital-to-analog converter 23 is used to convert the wheel speed signals of the first wheel speed sensor 30 and the second wheel speed sensor 40 into digital signals and send the digital signals to the CPLD chip 10. This configuration allows the CPLD chip 10 to make a comprehensive judgment by combining the digital signals of the wheel speed signals.
[0049] The CPLD chip 10 is configured to: acquire the first wheel speed signal from the first wheel speed sensor 30 and the second wheel speed signal from the second wheel speed sensor 40, compare the first wheel speed signal and the second wheel speed signal, calculate the signal delay difference, compare the calculated signal delay difference with the reference delay difference, obtain diagnostic information of the wheel speed signal based on the comparison result and the digital signal from the digital-to-analog converter 23, and send the diagnostic information to the receiving end through the wireless transmission module.
[0050] Specifically, the CPLD chip 10 of this application can acquire two types of signals, each containing wheel speed signals from the first wheel speed sensor 30 and the second wheel speed sensor 40. One signal undergoes signal processing to allow the CPLD chip 10 to compare and calculate the delay difference according to different data protocols; the other signal is converted by the digital-to-analog converter 23 and then sent to the CPLD chip 10. Finally, the CPLD chip 10 obtains diagnostic information about the wheel speed signals based on the comparison results of the delay difference and the digital signals from the digital-to-analog converter, i.e., determining whether the first wheel speed sensor 30 and the second wheel speed sensor 40 are working properly. This diagnostic signal is then transmitted to the receiving end, which is the vehicle controller, via a wireless transmission module.
[0051] Furthermore, the second wheel speed sensor 40 is connected to the chassis component via a data cable 41. The data cable 41 includes a filtering and shaping module 42 for shaping and filtering the wheel speed signal acquired from the second wheel speed sensor 40. In this invention, to confirm the reliability of wheel speed signal detection, wired data detection is further added, and the wheel speed signal is transmitted to the chassis component via the data cable 41. This allows the vehicle controller to make a comprehensive judgment based on the combination of wireless and wired signals, providing a stable wheel speed signal for the vehicle's autonomous driving. The chassis component includes one of an anti-lock braking system, an electronic stability control system, or a zone controller.
[0052] In another embodiment, the signal conversion system of the wireless sensor further includes a gyroscope 60, which is connected to the CPLD chip 10 via SPI. The detection data of the gyroscope 60 is processed by the CPLD chip 10 and then transmitted to the vehicle receiver via the wireless transmission module 50. This enables the signal conversion system of the wireless sensor of the present invention to solve the problem of simultaneous acquisition of multiple sensor protocols and multiple signals, and provides a solution for the integration of multiple sensors.
[0053] In another embodiment, the signal conversion system of the wireless sensor further includes an accelerometer 70 and a digital-to-analog converter 71. The input of the digital-to-analog converter 71 is connected to the accelerometer 70, and the output of the digital-to-analog converter 71 is connected to the CPLD chip 10 via SPI. The detection data from the accelerometer 70 is processed by the CPLD chip 10 and then transmitted to the vehicle receiver via the wireless transmission module 50. This allows the signal conversion system of the wireless sensor of the present invention to solve the problems of multiple sensor protocols and simultaneous acquisition of multiple signals, providing a solution for the integration of multiple sensors.
[0054] Of course, the signal conversion system of the wireless sensor of the present invention is not limited to the above-mentioned sensors. Other types of sensors can also be connected to the CPLD chip 10 to meet the integration of multiple sensors.
[0055] According to another aspect of the embodiments of the present invention, such as Figure 2 Combination Figure 1 As shown, a signal conversion method for a wireless sensor is provided. This method is applied to a signal conversion system for a wireless sensor as described in any of the above embodiments. The method includes:
[0056] S201. Acquire the first wheel speed signal of the first wheel speed sensor 30 and the second wheel speed signal of the second wheel speed sensor 40 respectively.
[0057] S202, Process the first wheel speed signal and the second wheel speed signal.
[0058] S203. Diagnose the wheel speed signals based on the processed first and second wheel speed signals.
[0059] S204. The diagnostic results are sent wirelessly to the vehicle receiver.
[0060] In this embodiment, the wheel speed sensor and the second wheel speed sensor 40 are respectively connected to the CPLD chip 10, so that the CPLD chip 10 can acquire the wheel speed signals of the first wheel speed sensor 30 and the second wheel speed sensor 40. The processing of the first and second wheel speed signals includes separating them according to a data protocol. Specifically, a first signal separation module 21 is connected between the first wheel speed sensor 30 and the CPLD chip 10 to separate the speed pulse and data protocol bit information of the wheel speed signal from the first wheel speed sensor 30. A second signal separation module 22 is connected between the second wheel speed sensor 40 and the CPLD chip 10 to separate the speed pulse and data protocol bit information of the wheel speed signal from the second wheel speed sensor 40.
[0061] The CPLD chip 10 then diagnoses the wheel speed signal based on the separated data. The diagnosis of the wheel speed signal is based on the processed first and second wheel speed signals, including: comparing similar signals and calculating the signal delay difference; comparing the calculated signal delay difference with the reference delay difference; and obtaining the diagnostic information of the wheel speed signal based on the comparison result.
[0062] Finally, the diagnostic results are sent to the vehicle receiver so that the vehicle receiver can determine whether the wheel speed signals of the first wheel speed sensor 30 and the second wheel speed sensor 40 are working properly based on the diagnostic results.
[0063] Furthermore, the signal conversion method of the wireless sensor also includes: acquiring the first wheel speed signal and the second wheel speed signal again through another line; converting the first wheel speed signal and the second wheel speed signal into digital signals respectively; and combining the digital signals with the comparison results of the calculated signal delay difference and the reference delay difference to obtain diagnostic information of the wheel speed signal.
[0064] Specifically, the CPLD chip 10 of this application can acquire two types of signals, each containing wheel speed signals from the first wheel speed sensor 30 and the second wheel speed sensor 40. One signal undergoes signal processing to allow the CPLD chip 10 to compare and calculate the delay difference according to different data protocols; the other signal is converted by the digital-to-analog converter 23 and then sent to the CPLD chip 10. Finally, the CPLD chip 10 obtains diagnostic information about the wheel speed signals based on the comparison results of the delay difference and the digital signals from the digital-to-analog converter, i.e., determining whether the first wheel speed sensor 30 and the second wheel speed sensor 40 are working properly. This diagnostic signal is then transmitted to the receiving end, which is the vehicle controller, via a wireless transmission module.
[0065] The wireless sensor signal conversion system and method provided by this invention acquires wheel speed signals from multiple sources, processes and diagnoses the acquired wheel speed signals, and then transmits them to the receiving end through a wireless transmission module. This invention achieves a flexible, efficient, and low-latency system design through a CPLD chip, solving the problems of low communication speed, complex peripheral circuits, and high chip cost in automotive-grade applications.
[0066] While the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the invention to these descriptions. Various changes in form and detail can be made by those skilled in the art, including several simple deductions or substitutions, without departing from the spirit and scope of the invention.
Claims
1. A signal conversion system for a wireless sensor, characterized in that, include: Programmable logic device (CPLD) chip, first wheel speed sensor, second wheel speed sensor, signal processing module and wireless transmission module; The input terminal of the signal processing module is connected to the first wheel speed sensor and the second wheel speed sensor respectively, and the output terminal of the signal processing module is connected to the CPLD chip; The output terminal of the CPLD chip is connected to the wireless transmission module; The CPLD chip performs a diagnosis based on the wheel speed signal processed by the signal processing module, and sends the diagnosis result to the receiving end through the wireless transmission module.
2. The signal conversion system for a wireless sensor according to claim 1, characterized in that, The signal processing module includes a first signal separation module. The input terminal of the first signal separation module is connected to the first wheel speed sensor, and the output terminal of the first signal separation module is connected to the CPLD chip. The first signal separation module is used to separate the speed pulse and data protocol bit information of the wheel speed signal of the first wheel speed sensor and send them to the CPLD chip.
3. The signal conversion system for a wireless sensor according to claim 2, characterized in that, The signal processing module includes a second signal separation module. The input terminal of the second signal separation module is connected to the second wheel speed sensor, and the output terminal of the second signal separation module is connected to the CPLD chip. The second signal separation module is used to separate the speed pulse and data protocol bit information of the wheel speed signal of the second wheel speed sensor and send them to the CPLD chip.
4. The signal conversion system for a wireless sensor according to claim 3, characterized in that, The signal processing module further includes a digital-to-analog converter (DAC). The input terminals of the DAC are connected to the first wheel speed sensor and the second wheel speed sensor, respectively, and the output terminal of the DAC is connected to the CPLD chip. The DAC is used to convert the wheel speed signals from the first wheel speed sensor and the second wheel speed sensor into digital signals and send the digital signals to the CPLD chip.
5. The signal conversion system for a wireless sensor according to claim 4, characterized in that, The CPLD chip is configured to: acquire the first wheel speed signal from the first wheel speed sensor and the second wheel speed signal from the second wheel speed sensor respectively; compare the first wheel speed signal with the second wheel speed signal and calculate the signal delay difference; compare the calculated signal delay difference with a reference delay difference; obtain diagnostic information of the wheel speed signal based on the comparison result and in conjunction with the digital signal from the digital-to-analog converter; and send the diagnostic information to the receiving end via a wireless transmission module.
6. The signal conversion system for a wireless sensor according to claim 3, characterized in that, The second wheel speed sensor is also connected to the chassis component via a data cable, and the data cable is equipped with a filtering and shaping module.
7. The signal conversion system for a wireless sensor according to claim 1, characterized in that, The signal conversion system of the wireless sensor also includes a gyroscope, which is connected to the CPLD chip via SPI.
8. The signal conversion system for a wireless sensor according to claim 1, characterized in that, The signal conversion system of the wireless sensor also includes an accelerometer and a digital-to-analog converter. The input of the digital-to-analog converter is connected to the accelerometer, and the output of the digital-to-analog converter is connected to the CPLD chip via SPI.
9. A signal conversion method for a wireless sensor, applied in the signal conversion system of a wireless sensor as described in any one of claims 1 to 8, characterized in that, The method includes: The first wheel speed signal from the first wheel speed sensor and the second wheel speed signal from the second wheel speed sensor are acquired respectively. The first wheel speed signal and the second wheel speed signal are processed; Diagnose the wheel speed signals based on the processed first wheel speed signal and second wheel speed signal; The diagnostic results are transmitted wirelessly to the vehicle receiver.
10. The method according to claim 9, characterized in that, The processing of the first wheel speed signal and the second wheel speed signal includes: The first wheel speed signal and the second wheel speed signal are separated according to the data protocol.
11. The method according to claim 10, characterized in that, The step of diagnosing the wheel speed signal based on the processed first wheel speed signal and second wheel speed signal includes: Compare signals of the same type and calculate the signal delay difference; Compare the calculated signal delay difference with the reference delay difference; Diagnostic information about the wheel speed signal is obtained based on the comparison results.
12. The method according to claim 11, characterized in that, Also includes: The first wheel speed signal and the second wheel speed signal are obtained again through another line; The first wheel speed signal and the second wheel speed signal are converted into digital signals respectively; The digital signal is combined with the comparison result of the calculated signal delay difference and the reference delay difference to obtain diagnostic information of the wheel speed signal.