Temperature measuring device for magneto-rheological damper and vehicle
By installing temperature sensing elements and signal processing circuits on the inner wall of the piston rod of the magnetorheological damper, the problem of difficult temperature measurement of magnetorheological fluid is solved, enabling accurate detection and real-time monitoring, extending the service life of the magnetorheological suspension and reducing oil leakage.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-27
- Publication Date
- 2026-03-20
AI Technical Summary
In existing technologies, the temperature of the magnetorheological fluid inside magnetorheological dampers is difficult to measure, leading to problems such as oil leakage and shortened lifespan under high-temperature environments.
Temperature sensing elements, such as thermocouples or temperature-sensitive diodes, are installed on the inner wall of the piston rod of the magnetorheological damper. A sampling current is generated by the temperature difference, and the signal is processed by the amplification and filtering circuit and the controller to achieve accurate measurement of the internal temperature.
It enables precise detection of the internal temperature of magnetorheological fluid, preventing prolonged high temperatures, extending suspension lifespan, reducing fluid leakage, and providing real-time temperature monitoring.
Smart Images
Figure CN224019167U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to magnetorheological damper technical field, especially relate to a temperature measuring device for magnetorheological damper and vehicle. BACKGROUND
[0002] Magnetorheological damper is based on the input information of vehicle body and wheel movement sensor, and makes real-time response to road conditions and driving environment by electromagnetic induction, and magnetorheological liquid is a kind of magnetic soft particle suspension, when the liquid is injected into the electromagnetic coil in damper piston, the magnetic field of coil will change its rheological property, thereby, in the case that there is no electromechanical control valve and mechanical device is simple, the damping force with rapid response and strong controllability is generated.
[0003] In the related art, magnetorheological damper temperature measurement usually adopts non-contact temperature measurement or measures the surface of cylinder. However, since the temperature of magnetorheological liquid in magnetorheological damper is not easy to measure, when the coil in magnetorheological damper heats, it will cause the temperature of magnetorheological liquid to rise, and long time in high temperature environment will cause magnetorheological damper to leak oil and shorten its service life. SUMMARY
[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide a temperature measuring device for magnetorheological damper and vehicle, to solve the technical problem that the temperature of magnetorheological liquid in magnetorheological damper cannot be measured.
[0005] To achieve the above-mentioned purpose and other related purposes, the first aspect of the utility model provides a temperature measuring device for magnetorheological damper, comprising: a piston rod, the inner wall of which is provided with a recess with a preset shape; a temperature measuring element, the shape of which is the same as the preset shape, and the temperature measuring element is embedded in the recess of the piston rod to keep the inner wall of the piston rod smooth, for generating a sampling current according to the temperature difference between the external temperature of the magnetorheological damper and the internal temperature of the magnetorheological liquid; an amplification filter circuit connected to the temperature measuring element, for amplification filtering processing of the sampling current; a controller connected to the amplification filter circuit, for analog-digital conversion of the processed sampling current to determine the temperature value.
[0006] In some embodiments of the first aspect, the temperature measuring element comprises a thermocouple or a temperature-sensitive diode.
[0007] In some embodiments of the first aspect, one end of the piston rod is a piston head and is located in the magnetorheological damper, and the other end of the piston rod is located outside the magnetorheological damper.
[0008] In some embodiments of the first aspect, the other end of the piston rod is arranged with an interface connected to the temperature measuring element.
[0009] In some embodiments of the first aspect, the shape of the temperature measuring element comprises any one of a ring shape, a flat shape, a strip shape, a probe shape or a multi-point array shape.
[0010] In some embodiments of the first aspect, the shape of the temperature measuring element comprises a T shape or an L shape.
[0011] In some embodiments of the first aspect, the temperature measuring device further comprises a display module connected to the controller to display the temperature value.
[0012] In some embodiments of the first aspect, the temperature measuring device further comprises an alarm module connected to the controller to issue an alarm when the monitored temperature value exceeds a preset temperature.
[0013] In some embodiments of the first aspect, the amplification and filtering circuit is integrated with the controller.
[0014] The second aspect of the utility model provides a vehicle comprising the temperature measuring device for magnetorheological shock absorber described above, the temperature measuring device is connected vehicle information system, and temperature value is displayed in the display screen of vehicle information system.
[0015] As above, one technical scheme of the temperature measuring device for magnetorheological shock absorber and the vehicle of the utility model has the following beneficial effects:
[0016] In the utility model, the temperature measuring element is arranged in the piston rod inside the magnetorheological shock absorber, and the sampling current is determined, the amplification and filtering circuit is used to amplify and filter the sampling current, the sampling current after processing is converted into analog-digital, the temperature value reflecting the temperature inside the magnetorheological fluid can be accurately measured, on the one hand, the magnetorheological fluid temperature can be accurately detected to prevent long-term high temperature, on the other hand, through real-time monitoring of temperature, the temperature collected has real-time nature, the magnetorheological suspension is prevented from working in the extreme high temperature environment for a long time, not only the service life of the suspension is prolonged, but also the oil leakage is reduced. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 Fig. 1 shows a schematic structural diagram of a temperature measuring device for magnetorheological shock absorber provided by the utility model;
[0018] Figure 2 Fig. 1 shows a schematic structural diagram of a temperature measuring device for magnetorheological shock absorber provided by the utility model;
[0019] Figure 3 Fig. 1 shows a schematic structural diagram of a temperature measuring device for magnetorheological shock absorber provided by the utility model;
[0020] Figure 4 Fig. 1 shows a schematic structural diagram of a temperature measuring device for magnetorheological shock absorber provided by the utility model; Figure 3 Fig. 1 shows a schematic structural diagram of a temperature measuring device for magnetorheological shock absorber provided by the utility model;
[0021] BRIEF DESCRIPTION OF DRAWINGS
[0022] 1, piston rod, 2, thermocouple, 3, thermocouple interface, 4, piston head, 5, shell, 10, magneto-rheological damper, 11, temperature measuring element, 12, amplification filter circuit, 13, controller. DETAILED DESCRIPTION
[0023] The embodiments of the present application will be described in detail below with specific examples, and other advantages and effects of the present application can be easily understood by those skilled in the art from the disclosure. The present application can also be implemented or applied in other different embodiments, and various modifications or changes can be made to the details in the specification without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.
[0024] It should be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present application in a schematic manner, and only the components related to the present application are shown in the drawings, not the number, shape and size of the components when actually implemented. The actual implementation of each component may be arbitrarily changed in shape, number and proportion, and the component layout pattern may also be more complex.
[0025] Please refer to Figure 1 The structure of a temperature measuring device for a magneto-rheological damper provided by the present application is shown in the following detailed description:
[0026] The piston rod 10 has a recess of a predetermined shape in the inner wall; the temperature measuring element 11 has the same shape as the predetermined shape, and is embedded in the recess of the piston rod 10, so that the inner wall of the piston rod 10 remains smooth (i.e., the inner wall of the piston rod 10 where the temperature measuring element is installed is still smooth without protrusions), for generating a sampling current according to the temperature difference between the external temperature of the magneto-rheological damper and the internal temperature of the magneto-rheological fluid;
[0027] The temperature measuring element 11 includes a thermocouple or a temperature-sensitive diode, wherein the thermocouple measures temperature based on the Seebeck effect to generate a temperature difference potential, has the advantages of wide temperature range, high temperature resistance and self-power supply, but requires cold end compensation and signal amplification, and is suitable for industrial high temperature and transient monitoring scenarios. The temperature-sensitive diode measures temperature based on the voltage-temperature characteristics of the semiconductor PN junction, has the advantages of high precision, easy integration and digitization, and is suitable for precision instruments, electronic equipment and other low temperature scenarios; in addition, the smooth inner wall does not affect the normal operation of the piston rod.
[0028] The amplification filter circuit 12 is connected to the temperature measuring element and amplifies and filters the sampling current.
[0029] Wherein, since the signal of the sampling current is usually very weak, if directly processed, it will lead to signal distortion or cannot be accurately identified, therefore, it is necessary to amplify the signal to the preset specification through the amplification circuit, which is beneficial to accurate measurement; at the same time, in the sampling process of the temperature signal, in addition to the useful temperature signal, there are various noise and interference signals, these noise and interference signals will also seriously affect the accuracy and reliability of the signal after amplification processing, and it is necessary to remove these noise and interference components through the filter circuit, therefore, the amplification filter circuit integrating the amplification circuit and the filter circuit is introduced.
[0030] It should be understood that the amplification filter circuit includes a low-pass filter and a signal amplification circuit, wherein the amplification multiple of the signal amplification circuit is determined based on the output signal range of the sensor and the input range of the ADC (analog-to-digital converter) to avoid signal distortion and noise amplification, for example, the amplification filter circuit includes but is not limited to AD8495 chip for thermocouple special and built-in cold end compensation, MAX31865 (thermal resistance signal conditioner), which has a simplified design, integrated amplification, filtering and linearization functions.
[0031] In addition, the amplification filter circuit can also include an instrument signal preamplifier for amplifying differential signals and suppressing common-mode noise, and the filter circuit is a second-order active low-pass filter.
[0032] The controller 13 is connected to the amplification filter circuit to perform analog-to-digital conversion on the processed sampling current and determine the temperature value.
[0033] Wherein, the amplification filter circuit and the controller can be integrated, the controller adopts NSA3300 (far infrared temperature signal conditioning chip) which has integrated filter, amplifier (maximum gain 128 times), ADC, negative temperature coefficient ambient temperature sensor and digital interface, supports ambient temperature compensation and electrically erasable programmable read-only memory calibration parameter storage. It is suitable for non-contact infrared temperature measurement (such as far infrared temperature sensor), which simplifies the back-end circuit design. Alternatively, the controller adopts AD8495 (thermocouple special chip) which integrates cold end compensation and amplification filter circuit, directly outputs linearized temperature signal, and simplifies the thermocouple temperature measurement design.
[0034] By the above-mentioned manner, the temperature measuring element is arranged in the piston rod inside the magnetorheological damper, the sampling current is determined, the sampling current is amplified and filtered by the amplification filtering circuit, and the processed sampling current is analog-to-digital converted, so that the temperature value reflecting the temperature inside the magnetorheological fluid can be accurately measured. On one hand, the magnetorheological fluid temperature can be accurately detected to prevent long-term high temperature. On the other hand, through real-time temperature monitoring, the collected temperature is real-time, the magnetorheological suspension is prevented from working in a limit high temperature environment for a long time, the service life of the suspension is prolonged, and the oil leakage is reduced.
[0035] In some embodiments, the temperature measuring element is embedded in the inner wall of the piston rod, and the temperature measuring element is embedded in the inner wall of the piston rod and integrated with the inner wall. On one hand, even if the time increases, the temperature measuring element will not fall off due to long-term failure, and thus affect the normal operation of the piston rod inside the magnetorheological damper. On the other hand, since the inside of the piston rod is the core area of friction heat generation, hydraulic oil temperature rise or mechanical deformation, the embedded temperature measuring element can bypass external environmental interference and directly obtain the real working temperature, and the lag error is also avoided. On the other hand, the inner wall contact type temperature measurement response speed is faster than that of the external mounting, for example, the thermocouple response time can be shortened to milliseconds, which is suitable for monitoring transient temperature fluctuations.
[0036] In some embodiments, referring to Figure 2 As shown in the figure, one end of the piston rod 1 is a piston head 4 and is located in the magnetorheological damper, and the other end of the piston rod 1 is located outside the magnetorheological damper (the shell 5). Since the thermocouple 2 is embedded in the inner wall of the piston rod 1, a smooth inner wall is formed. At the same time, the other end of the piston rod 1 is provided with a temperature measuring element interface 3, and the temperature measuring element interface 3 is arranged outside the shell. The sampling current can be transmitted to the amplification filtering circuit through the temperature measuring element interface 3, and the rear-end sampling processing is facilitated.
[0037] In some embodiments, the shape of the temperature measuring element includes any one of a ring shape, a flat shape, a strip shape, a probe shape or a multi-point array. Different shapes can be selected according to the use requirements, and the specifications of various shapes are not small, which ensures effective and sufficient contact with the magnetorheological fluid. The temperature measuring element in different shapes is embedded in the inner wall of the piston rod to accurately collect the temperature of the magnetorheological fluid.
[0038] In some embodiments, the shape of the temperature measuring element includes a T shape or an L shape. For example, since the L shape or the T shape is in a strip shape, as Figure 3 As shown in the figure, taking the T-shaped thermocouple 2 as an example, the thermocouple itself can contact the magnetorheological fluid to be measured at any time during the working process of the piston rod, which increases the contact area and is conducive to real-time and accurate collection of the temperature inside the piston rod. As Figure 4As shown in the sectional view, the T-shaped thermocouple is sectioned along the central axis of the T-shaped thermocouple, i.e., along the A-A' sectioning line, so that the T-shaped thermocouple increases the contact area not only in the longitudinal axis direction but also in the transverse axis direction.
[0039] In some embodiments, the temperature measuring device further comprises a display module connected to the controller to display the temperature value, so that the collected temperature value can be displayed through the display module, which is beneficial for the driver or user to timely monitor the temperature of the MR fluid, for example, at the vehicle end, the display module can be a vehicle screen or a display screen configured for the temperature measuring device to display separately.
[0040] In some embodiments, the temperature measuring device further comprises an alarm module connected to the controller to issue an alarm when the monitored temperature value exceeds the preset temperature, so that the driver or user can be notified in time when the above-mentioned temperature anomaly is found through the alarm module, for example, at the vehicle end, the alarm module can display alarm information on the vehicle screen, the alarm information is not limited to any form of sound, light or electricity, of course, a separate alarm module can also be configured for the temperature measuring device, which is not limited herein.
[0041] In some embodiments, the vehicle provided by the utility model comprises the temperature measuring device for the MR damper described above, and the temperature measuring device is connected to the vehicle information system to display the temperature value on the display screen of the vehicle information system.
[0042] The vehicle information system (i.e., the vehicle system) controls the MR suspension and adjusts the driving mode, for example, the working frequency of the MR suspension is adjusted through the vehicle system, and when the temperature is detected to be too high, the current is adjusted to reduce the frequency to reduce the heat generation.
[0043] The controller (MR suspension controller) controls the suspension according to the data collected by the sensor and the algorithm built in the controller.
[0044] The thermocouple converts the temperature into an electric current by using the Seebeck effect, and different temperature differences will generate different corresponding electric currents, which are transmitted to the controller after being processed by an amplification and filtering circuit.
[0045] ①The T-shaped thermocouple material embedded in the piston rod is used to collect the temperature inside the MR fluid, as shown in Figure 3
[0046] ②The temperature difference is formed between the internal temperature of the MR fluid and the external temperature of the MR damper, and according to the Seebeck effect, an electromotive force is generated at the mutual contact of the two thermocouple materials, and the mutual contact of the two materials forms a loop, thereby generating a sampling current.
[0047] ③The collected current is transmitted back to the controller through the amplification and filtering circuit inside the controller, and the controller calculates the temperature inside the MR damper according to the calibrated data and displays it on the vehicle screen.
[0048] IV. The controller or the car system compares the calculated temperature data with the built-in optimal working temperature, and if the internal temperature is about to exceed the optimal working temperature, the user is reminded in time, and the user decides whether to adjust the driving mode according to individual needs.
[0049] In the embodiment, by accurately measuring the temperature value reflecting the internal temperature of the magnetorheological fluid, on the one hand, the magnetorheological fluid temperature can be accurately detected to prevent long-term high temperature; on the other hand, through real-time monitoring of the temperature, the collected temperature has real-time performance; the magnetorheological suspension is prevented from working in an extreme high-temperature environment for a long time, not only the service life of the suspension is prolonged, but also the leakage of the oil is reduced.
[0050] The above embodiment only exemplarily illustrates the principle and effect of the utility model, and is not used to limit the utility model. Any person skilled in the art can modify or change the above embodiment without departing from the spirit and scope of the utility model. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the utility model should be covered by the claims of the utility model.
Claims
1. A temperature measuring device for a magnetorheological vibration damper, characterized in that, include: The piston rod has a groove of a predetermined shape on its inner wall; A temperature sensing element, the shape of which is the same as the preset shape, is embedded in the groove of the piston rod to keep the inner wall of the piston rod smooth, and is used to generate a sampling current based on the temperature difference between the external temperature of the magnetorheological damper and the internal temperature of the magnetorheological fluid; An amplification and filtering circuit is connected to the temperature sensing element to amplify and filter the sampling current. The controller, connected to the amplification and filtering circuit, performs analog-to-digital conversion on the processed sampled current to determine the temperature value.
2. The temperature measuring device for a magnetorheological vibration damper according to claim 1, characterized in that, The temperature sensing element includes a thermocouple or a temperature-sensitive diode.
3. The temperature measuring device for a magnetorheological vibration damper according to claim 1, characterized in that, One end of the piston rod is the piston head and is located inside the magnetorheological damper, while the other end of the piston rod is located outside the magnetorheological damper.
4. The temperature measuring device for a magnetorheological vibration damper according to claim 3, characterized in that, The other end of the piston rod is provided with an interface for connecting the temperature measuring element.
5. The temperature measuring device for a magnetorheological vibration damper according to claim 1, characterized in that, The temperature sensing element can be T-shaped or L-shaped.
6. The temperature measuring device for a magnetorheological vibration damper according to claim 1, characterized in that, The shape of the temperature sensing element includes any one of the following: ring-shaped, flat, strip-shaped, probe-shaped, or dot array.
7. The temperature measuring device for a magnetorheological vibration damper according to any one of claims 1 to 6, characterized in that, Also includes: The display module is connected to the controller to display the temperature value.
8. The temperature measuring device for a magnetorheological vibration damper according to any one of claims 1 to 6, characterized in that, Also includes: An alarm module, connected to the controller, issues an alarm when the monitored temperature value exceeds a preset temperature.
9. The temperature measuring device for a magnetorheological vibration damper according to any one of claims 1 to 6, characterized in that, The amplification and filtering circuit is integrated with the controller.
10. A vehicle, characterized in that, include: The temperature measuring device for a magnetorheological damper according to any one of claims 1 to 9 is used, wherein the temperature measuring device is connected to an in-vehicle information system and displays the temperature value on the display screen of the in-vehicle information system.