High-precision road surface icing sensing control circuit, sensor device, and sensing system
By combining multi-channel optical transmission and differential reception with signal conditioning processing, the problem of inaccurate detection caused by ice surface reflection in traditional icing sensors has been solved, achieving high-precision ice thickness detection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Filing Date
- 2025-09-22
- Publication Date
- 2026-07-14
AI Technical Summary
Traditional icing sensors are inaccurate due to the reflection of the ice surface, making it impossible to accurately detect the thickness of the ice layer.
A multi-channel optical emission module is used to emit multiple pulsed light beams, which are then differentially amplified by a multi-channel optoelectronic differential receiving module. The signal conditioning module performs synchronous integration, multiplication, and filtering to separate noise and improve detection accuracy.
Stable acquisition of multiple analog signals was achieved, overcoming the instability of single-channel signal acquisition, improving detection accuracy, and ensuring accurate detection of ice thickness.
Smart Images
Figure CN224501188U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of measurement equipment technology, specifically relating to a device for predicting weather conditions, and more particularly to a high-precision road icing sensing and control circuit, sensor equipment and sensing system. Background Technology
[0002] After roads freeze, it is necessary to detect the thickness of the ice layer and perform different operations according to different situations, such as spreading salt or breaking ice. Traditional icing sensors illuminate the ice surface with a single infrared light, obtain the light reflection signal, and then simply amplify the signal. Due to the reflection and refraction of the ice surface, the detected signal is inaccurate, and thus the ice surface cannot be accurately processed.
[0003] Therefore, there is an urgent need to develop a new high-precision road icing sensing and control circuit, sensor equipment, and sensing system to solve the technical problem of inaccurate detection caused by the reflection of ice surface in traditional icing sensors using single-channel infrared light acquisition.
[0004] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Utility Model Content
[0005] This disclosure provides at least one high-precision road icing sensing and control circuit, sensor device, and sensing system.
[0006] In a first aspect, embodiments of this disclosure provide a road icing sensing and control circuit, comprising: a processing module, a multi-channel optical emission module, a multi-channel photoelectric differential receiving module, and a signal conditioning module; wherein the multi-channel optical emission module and the signal conditioning module are electrically connected to the processing module; the processing module is configured to drive the multi-channel optical emission module to sequentially emit multiple pulsed lights onto the ice surface, and the pulsed lights are reflected by the ice surface to the multi-channel photoelectric differential receiving module; the multi-channel photoelectric differential receiving module is configured to convert the corresponding pulsed lights into photoelectric conversion signals, and the photoelectric conversion signals are filtered for noise by the signal conditioning module and then output to the processing module.
[0007] In one optional embodiment, the multi-channel light emission module includes: a plurality of light source modulation units and a plurality of light-emitting diodes; the light source modulation units are electrically connected to the processing module, and the light-emitting diodes are electrically connected to their corresponding light source modulation units; the processing module is configured to drive the light-emitting diodes to emit corresponding pulsed light at a set frequency through the light source modulation units.
[0008] In one optional embodiment, the multi-channel photoelectric differential receiver module includes: a plurality of receiving transistors and a differential amplifier; every two receiving transistors are electrically connected to the differential amplifier, and the differential amplifier is electrically connected to a signal conditioning module; the two receiving transistors respectively convert the corresponding pulse light into photoelectric conversion signals and output them to the differential amplifier for differential amplification.
[0009] In one optional embodiment, the signal conditioning module includes: a first analog switch, a signal conditioning unit, and a second analog switch; the first analog switch is electrically connected to each differential amplifier, and the first analog switch, the signal conditioning unit, and the second analog switch are electrically connected in sequence; the signal conditioning unit is electrically connected to the processing module; the processing module is configured to drive the first analog switch to select and turn on the corresponding differential amplifier to obtain the corresponding photoelectric conversion signal, and the photoelectric conversion signal is filtered for noise by the signal conditioning unit; the processing module is also configured to drive the second analog switch to select the corresponding photoelectric conversion signal for output.
[0010] In one optional embodiment, the signal conditioning unit includes: a synchronous integrator, a multiplier, and a comparator; the first analog switch, the synchronous integrator, the multiplier, and the second analog switch are electrically connected in sequence; the comparator is electrically connected to the processing module, and the comparator is also electrically connected to the synchronous integrator and the multiplier; the processing module is configured to output a reference signal to the synchronous integrator and the multiplier through the comparator, so that the synchronous integrator and the multiplier perform synchronization and multiplication operations on the photoelectric conversion signal to separate noise in the photoelectric conversion signal.
[0011] In one optional implementation, a low-pass filter is further provided between the multiplier and the second analog switch to filter the photoelectric conversion signal.
[0012] Secondly, embodiments of this disclosure also provide a road icing sensing device, which includes: a housing and a road icing sensing control circuit as described above; wherein the road icing sensing control circuit is installed in the housing.
[0013] Thirdly, embodiments of this disclosure also provide a sensing system comprising: a plurality of road icing sensing devices as described above, a CAN bus, and a server; wherein each of the road icing sensing devices is electrically connected to the server via the CAN bus.
[0014] The beneficial effects of this utility model are that it emits multiple pulsed light through a multi-channel optical emission module, which is then differentially amplified by a multi-channel photoelectric differential receiving module. Simultaneously, after synchronous integration, multiplication, and filtering by the signal conditioning module, it can achieve the acquisition of multiple analog signals, overcoming the problem of inaccurate detection caused by the instability of single-channel signal acquisition. At the same time, noise is separated during signal processing, thereby improving detection accuracy.
[0015] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description and the accompanying drawings.
[0016] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description
[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0018] Figure 1 A schematic block diagram of a road icing sensing and control circuit provided in an embodiment of this disclosure;
[0019] Figure 2 A circuit diagram of a processing module provided in an embodiment of this disclosure;
[0020] Figure 3 A circuit diagram of a multi-channel optical emission module provided in an embodiment of this disclosure;
[0021] Figure 4 A circuit diagram of a multi-channel photoelectric differential receiver module provided for embodiments of this disclosure;
[0022] Figure 5 A circuit diagram of a signal conditioning module provided in an embodiment of this disclosure;
[0023] Figure 6 This is a schematic block diagram of a sensing system provided in an embodiment of the present disclosure. Detailed Implementation
[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0025] In this document, when it is mentioned that a first component is located on a second component, this can mean that the first component can be directly formed on the second component, or that a third component can be inserted between the first and second components. Furthermore, in the accompanying drawings, the thickness of the components may be exaggerated or reduced for the purpose of effectively describing the technical content.
[0026] In this document, when an element or layer is referred to as “located,” “joined to,” “connected to,” “attached to,” or “coupled to” another element or layer, it may be directly located, joined, connected, attached to, or coupled to the other element or layer, or there may be intermediate elements or layers present. Conversely, when an element is referred to as “directly on another element or layer,” “directly joined to,” “directly connected to,” “directly attached to,” or “directly coupled to” another element or layer, there may be no intermediate elements or layers present. Other terms used to describe relationships between elements should be interpreted in a similar manner (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and / or” includes any and all combinations of one or more of the related listed items.
[0027] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify the entire list of elements when following a list of elements, rather than individual elements in the list. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.
[0028] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise clearly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.
[0029] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.
[0030] It should be noted that similar labels 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.
[0031] The following detailed description, with reference to the accompanying drawings, describes some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0032] like Figures 1 to 5 As shown, at least one embodiment provides a road icing sensing and control circuit, which includes: a processing module, a multi-channel optical emission module, a multi-channel photoelectric differential receiving module, and a signal conditioning module; wherein the multi-channel optical emission module and the signal conditioning module are electrically connected to the processing module; the processing module is configured to drive the multi-channel optical emission module to sequentially emit multiple pulsed lights onto the ice surface, and the pulsed lights are reflected by the ice surface to the multi-channel photoelectric differential receiving module; the multi-channel photoelectric differential receiving module is configured to convert the corresponding pulsed lights into photoelectric conversion signals, and the photoelectric conversion signals are filtered for noise by the signal conditioning module and then output to the processing module.
[0033] Specifically, please refer to Figure 2 The processing module is U1 in the figure, which can be, but is not limited to, an MSP430F2122IPW microcontroller.
[0034] In at least one embodiment, multiple pulsed lights are emitted by a multi-channel optical emission module, and then differentially amplified by a multi-channel photoelectric differential receiving module. Simultaneously, after synchronous integration, multiplication, and filtering by a signal conditioning module, multiple analog signals can be acquired, overcoming the problem of inaccurate detection caused by the instability of single-channel signal acquisition. At the same time, noise is separated during signal processing to improve detection accuracy.
[0035] In at least one embodiment, please refer to Figure 3The multi-channel light emission module includes: several light source modulation units and several light-emitting diodes; the light source modulation units are electrically connected to the processing module, and the light-emitting diodes are electrically connected to their corresponding light source modulation units; the processing module is configured to drive the light-emitting diodes to emit corresponding pulse light at a set frequency through the light source modulation units.
[0036] Specifically, please refer to Figure 3 L1 is a light-emitting diode.
[0037] Specifically, the light-emitting diode uses near-infrared light, which avoids visible light.
[0038] Specifically, the light source modulation module includes a control transistor Q1. The processing module drives the control transistor Q1 to modulate the light-emitting diode to a set frequency through a reference signal Vref, thereby improving the ability to resist white noise and zero drift.
[0039] In at least one embodiment, please refer to Figure 4 The multi-channel photoelectric differential receiver module includes: a plurality of receiving transistors and a differential amplifier; every two receiving transistors are electrically connected to the differential amplifier, and the differential amplifier is electrically connected to the signal conditioning module; the two receiving transistors respectively convert the corresponding pulse light into photoelectric conversion signals and output them to the differential amplifier for differential amplification.
[0040] Specifically, please refer to Figure 4 DE1 and DE2 are both receiving transistors.
[0041] Specifically, please refer to Figure 4 U10 is a differential amplifier, and it can be, but is not limited to, an AD620AR amplifier.
[0042] Specifically, please refer to Figure 4 Differential reception of photoelectric conversion signals is achieved through receiving transistors DE1 and DE2. After the two differential signals enter the differential amplifier, the common-mode signal is eliminated, the differential-mode voltage is amplified, and finally the analog voltage Vout related to the icing information is output.
[0043] Specifically, please refer to Figure 4 The input signal of the differential amplifier is two photoelectric conversion signals with the same light flux, which can effectively reduce the influence of background light.
[0044] In at least one embodiment, please refer to Figure 5The signal conditioning module includes: a first analog switch, a signal conditioning unit, and a second analog switch; the first analog switch is electrically connected to each differential amplifier, and the first analog switch, the signal conditioning unit, and the second analog switch are electrically connected in sequence; the signal conditioning unit is electrically connected to the processing module; the processing module is configured to drive the first analog switch to select and turn on the corresponding differential amplifier to obtain the corresponding photoelectric conversion signal, and the photoelectric conversion signal is filtered for noise by the signal conditioning unit; the processing module is also configured to drive the second analog switch to select the corresponding photoelectric conversion signal for output.
[0045] In at least one embodiment, please refer to Figure 5 The signal conditioning unit includes a synchronous integrator, a multiplier, and a comparator; the first analog switch, the synchronous integrator, the multiplier, and the second analog switch are electrically connected in sequence; the comparator is electrically connected to the processing module, and the comparator is also electrically connected to the synchronous integrator and the multiplier; the processing module is configured to output a reference signal to the synchronous integrator and the multiplier through the comparator, so that the synchronous integrator and the multiplier perform synchronous and multiplication operations on the photoelectric conversion signal to separate noise in the photoelectric conversion signal.
[0046] Specifically, please refer to Figure 5 The voltage is boosted by the comparator and then used as the reference signal for the synchronous integrator and multiplier.
[0047] Specifically, please refer to Figure 5 The synchronous integrator is essentially an automatic frequency tracking filter for the signal, which filters out some of the noise in the differential amplified signal.
[0048] Specifically, please refer to Figure 5 The multiplier performs cross-correlation operations between the periodic input signal to be tested and a reference signal of the same frequency, thereby separating the information carried in the periodic signal from strong noise.
[0049] Specifically, please refer to Figure 5 The first analog switch is controlled by the processing module to realize the locking detection of multiple signals (synchronous accumulation and correlation detection). The output signal is then selected by the second analog switch and sampled and held respectively to realize the real-time acquisition of three analog signals.
[0050] In at least one embodiment, please refer to Figure 5 A low-pass filter is also provided between the multiplier and the second analog switch to filter the photoelectric conversion signal.
[0051] Specifically, the low-pass filter is a second-order Butterworth low-pass filter.
[0052] Specifically, a lock-in detection amplifier using a synchronous integrator and a multiplier is used to first convert the DC approximate square wave voltage signal into AC to eliminate DC offset interference. Then, the positive and negative half-cycle signals are accumulated separately through synchronous integration. Finally, the negative half-cycle signal is flipped by an analog multiplier to obtain an approximate DC signal, and then a low-pass filter is used to output a smooth DC signal.
[0053] Based on the same technical concept, at least one embodiment also provides a road icing sensing device, which includes: a housing and a road icing sensing control circuit as described above; wherein the road icing sensing control circuit is installed in the housing.
[0054] Based on the same technological concept, such as Figures 1 to 6 As shown, at least one embodiment also provides a sensing system comprising: a plurality of road icing sensing devices as described above, a CAN bus, and a server; wherein each of the road icing sensing devices is electrically connected to the server via the CAN bus.
[0055] In summary, this invention emits multiple pulsed light through a multi-channel optical emission module, which is then differentially amplified by multiple photoelectric differential receiving modules. Simultaneously, after synchronous integration, multiplication, and filtering by the signal conditioning module, it can acquire multiple analog signals, overcoming the problem of inaccurate detection caused by the instability of single-channel signal acquisition. Furthermore, noise is separated during signal processing, thereby improving detection accuracy.
[0056] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 utility model based on the specific circumstances.
[0057] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as the second element, component, region, layer, or segment.
[0058] Spatially relative terms, such as “inside,” “outside,” “below,” “below,” “down,” “above,” “up,” etc., may be used herein to describe the relationship between one element or feature illustrated in the figures and another element or feature. In addition to the orientations depicted in the figures, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is flipped, an element described as “below” or “below” other elements or features would be oriented as “above” other elements or features. Thus, the example term “below” can cover both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.
[0059] In the above discussion, unless otherwise stated, when used to describe numerical values, the terms “about,” “approximately,” “basically,” etc., indicate a change of + / - 10% in that value.
[0060] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.
Claims
1. A high-precision road icing sensing and control circuit, characterized in that, include: Processing module, multi-channel optical transmission module, multi-channel optoelectronic differential reception module, and signal conditioning module; in The multi-channel optical emission module and the signal conditioning module are electrically connected to the processing module, respectively. The processing module is configured to drive the multi-channel optical emission module to sequentially emit multiple pulsed lights onto the ice surface, and the pulsed lights are reflected by the ice surface to the multi-channel photoelectric differential receiving module; The multi-channel photoelectric differential receiving module is configured to convert the corresponding pulse light into photoelectric conversion signals, and the photoelectric conversion signals are filtered for noise and accumulated by the signal conditioning module before being output to the processing module.
2. The high-precision road icing sensing and control circuit as described in claim 1, characterized in that, The multi-channel optical emission module includes: several light source modulation units and several light-emitting diodes; The light source modulation unit is electrically connected to the processing module, and the light-emitting diode is electrically connected to the corresponding light source modulation unit; The processing module is configured to drive the light-emitting diode to emit corresponding pulse light at a set frequency through the light source modulation unit.
3. The high-precision road icing sensing and control circuit as described in claim 1, characterized in that, The multi-channel optoelectronic differential receiver module includes: several receiving transistors and differential amplifiers; Each pair of the receiving transistors is electrically connected to a differential amplifier, which is electrically connected to a signal conditioning module. The two receiving transistors respectively convert the corresponding pulse light into photoelectric conversion signals and output them to the differential amplifier for differential amplification.
4. The high-precision road icing sensing and control circuit as described in claim 3, characterized in that, The signal conditioning module includes: a first analog switch, a signal conditioning unit, and a second analog switch; The first analog switch is electrically connected to each differential amplifier, and the first analog switch, the signal conditioning unit, and the second analog switch are electrically connected in sequence. The signal conditioning unit is electrically connected to the processing module. The processing module is configured to drive a first analog switch to select and connect a corresponding differential amplifier to obtain a corresponding photoelectric conversion signal. The photoelectric conversion signal is filtered for noise by the signal conditioning unit. The processing module is also configured to drive a second analog switch to select a corresponding photoelectric conversion signal for output.
5. The high-precision road icing sensing and control circuit as described in claim 4, characterized in that, The signal conditioning unit includes: a synchronous integrator, a multiplier, and a comparator; The first analog switch, the synchronous integrator, the multiplier, and the second analog switch are electrically connected in sequence. The comparator is electrically connected to the processing module, and the comparator is also electrically connected to the synchronous integrator and the multiplier. The processing module is configured to output a reference signal to the synchronous integrator and multiplier via a comparator, so that the synchronous integrator and multiplier perform synchronous and multiplication operations on the photoelectric conversion signal to separate noise in the photoelectric conversion signal.
6. The high-precision road icing sensing and control circuit as described in claim 5, characterized in that, A low-pass filter is also provided between the multiplier and the second analog switch to filter the photoelectric conversion signal.
7. A sensor device, characterized in that, include: The housing and the high-precision road icing sensing and control circuit as described in any one of claims 1-6; in The high-precision road icing sensing and control circuit is installed in the housing.
8. A sensing system, characterized in that, include: Several sensor devices, CAN bus, and servers as described in claim 7; in Each of the aforementioned sensor devices is electrically connected to the server via a CAN bus.