Electromagnetic valve temperature control method and system of continuous damping control shock absorber

Abstract

The invention discloses a method and system for controlling the temperature of an electromagnetic valve of a continuous damping control shock absorber, and the method comprises the steps: calculating the current resistance and the current input power according to the current driving voltage, the current driving current and the current PWM duty ratio, which are collected in real time, of the electromagnetic valve, and calculating the current resistance and the current input power based on a preset duty ratio-resistance-temperature three-dimensional mapping relation; calculating the current electromagnetic valve temperature; the heat capacity, the static heat resistance and the current environment temperature of the electromagnetic valve are obtained, and the temperature Tpred of the next moment is predicted in combination with the current electromagnetic valve temperature, the current input power and the preset time step length; if the Tpred is higher than the over-temperature set value, derating the current driving current to a first set value within a first preset time; and maintaining the first set value current for a second preset time to promote the Tpred to fall back. An external temperature sensor is not needed, and the technical cost is effectively reduced. Graded derating is carried out on the driving current of the electromagnetic valve, so that the risks of mechanical shock and system failure caused by sudden current drop due to over-temperature are reduced to a certain extent.

Description

Technical Field

[0001] This application relates to the field of vehicle control, and particularly to a solenoid valve temperature control method and system for a continuously variable damping shock absorber. Background Art

[0002] In a continuously variable damping shock absorber, an excessively high solenoid valve temperature will cause multiple risks: the high temperature aging of the coil insulation layer will double the short - circuit risk, the thermal demagnetization of the magnetic core material will cause the driving force to decay, the thermal expansion of the valve body will cause mechanical jamming, and in extreme cases, it will even lead to the complete failure of the shock absorber. In the solenoid valve temperature control technology of continuously variable damping shock absorbers, traditional solutions rely on external temperature sensors to monitor temperature, such as NTC (Negative Temperature Coefficient) thermistors, which have problems such as complex installation, high cost, and susceptibility to environmental interference; existing protection methods based on fixed current thresholds frequently trigger forced load reduction under high - temperature conditions, seriously affecting the damping performance, and are prone to mechanical shock due to sudden current drops during sudden overheating. Summary of the Invention

[0003] This application provides a solenoid valve temperature control method and system for a continuously variable damping shock absorber, which can solve the technical problems existing in the current technology: mechanical shock and system failure caused by sudden current drops when the solenoid valve temperature is too high.

[0004] To achieve the above object, in a first aspect, this application provides a solenoid valve temperature control method for a continuously variable damping shock absorber, and the method includes:

[0005] Calculate the current resistance and current input power according to the currently collected current drive voltage, current drive current, and duty cycle of the current PWM of the solenoid valve, and calculate the current solenoid valve temperature based on a preset three - dimensional mapping relationship of duty cycle - resistance - temperature.

[0006] Obtain the heat capacity, static thermal resistance of the solenoid valve, and the current ambient temperature, and combine the current solenoid valve temperature, current input power, and a preset time step to predict the temperature T at the next moment pred .

[0007] If T pred is higher than the over - temperature set value, reduce the current drive current to a first set value within a first preset time; maintain the current of the first set value for a second preset time to promote the drop of T pred to fall back.

[0008] Further, in an embodiment, the prediction of the temperature T at the next moment pred , includes:

[0009] Calculate the current heat dissipation power according to the static thermal resistance, current ambient temperature, and current solenoid valve temperature.

[0010] Predict the temperature T at the next moment based on the current solenoid valve temperature, the current input power, the current heat dissipation power, the heat capacity of the solenoid valve, and a preset time step. pred 。

[0011] Further, in one embodiment, the predicting the temperature T at the next moment pred , includes:

[0012] Obtain the solenoid valve switching frequency and calculate the current switching loss power.

[0013] Obtain the current road condition level and obtain the corresponding current vibration additional loss power based on a preset road condition - loss table.

[0014] Obtain the current vehicle speed, and combine the static thermal resistance, the current ambient temperature, the current solenoid valve temperature, and a preset vehicle speed influence coefficient to calculate the current heat dissipation power.

[0015] Predict the temperature T at the next moment according to the current solenoid valve temperature, the current input power, the current switching loss power, the current vibration additional loss power, the current heat dissipation power, the heat capacity of the solenoid valve, and a preset time step. pred 。

[0016] Further, in one embodiment, when T pred is not higher than the over - temperature set value, if T pred is not higher than the second set value, do not adjust the target current; if T pred is between the second set value and the over - temperature set value, derate the target current; wherein, the second set value is less than the over - temperature set value.

[0017] Further, in one embodiment, preset a limit range for the target current. The maximum current of the limit range is set according to the solenoid valve capacity, and the minimum current of the limit range is set to the current that can ensure the minimum damping force of the shock absorber.

[0018] Further, in one embodiment, the limit range of the target current is adjusted based on the environmental working conditions, including: when the vehicle is jolting at high speed, increase the maximum value of the limit range; when the solenoid valve is under long - term load or in a high - temperature environment, reduce the maximum value of the limit range.

[0019] Further, in one embodiment, if after the end of the second preset time, T pred falls below the over - temperature set value and continues for a preset hysteresis time, stop the derating operation of the drive current.

[0020] Further, in one embodiment, if after the end of the second preset time, T pred does not fall below the over - temperature set value, cut off the drive current of the solenoid valve and bypass the solenoid valve.

[0021] In a second aspect, based on the solenoid valve temperature control method for a continuously damped shock absorber described above, the present application provides a solenoid valve temperature control system for a continuously damped shock absorber, and the system includes:

[0022] An acquisition module, which is used to collect the current driving voltage, current driving current, and duty cycle of the current PWM of the solenoid valve in real time.

[0023] A calculation module, which is used to calculate the current resistance and current input power, and calculate the current solenoid valve temperature based on a preset three-dimensional mapping relationship of duty cycle-resistance-temperature.

[0024] A prediction module, which is used to obtain the heat capacity, static thermal resistance of the solenoid valve, and the current ambient temperature, and combine the current solenoid valve temperature, current input power, and a preset time step to predict the temperature T at the next moment pred .

[0025] A derating module, which is used to derate the current driving current.

[0026] If T pred is higher than the over-temperature set value, derate the current driving current to a first set value within a first preset time; maintain the current of the first set value for a second preset time to promote the fall of T pred .

[0027] Furthermore, in an embodiment, the solenoid valve temperature control system further includes:

[0028] An exit module, when the second preset time ends, and after T pred falls below the over-temperature set value and continues for a preset hysteresis time, it is used to exit the over-temperature protection mode.

[0029] A cut-off module, when the second preset time ends, and if T pred does not fall below the over-temperature set value, then cut off the driving current of the solenoid valve and bypass the solenoid valve, and it is used to cut off the driving current of the solenoid valve and bypass the solenoid valve.

[0030] The beneficial effects brought by the technical solution provided by the embodiments of the present application include:

[0031] By collecting the operating parameters of the solenoid valve in real time and predicting the temperature at the next moment, and calculating the current solenoid valve temperature based on a preset three-dimensional mapping relationship of duty cycle-resistance-temperature, the present application does not require an external temperature sensor, effectively reduces costs, and to a certain extent avoids measurement errors caused by unstable sensor devices and environmental factors, improves the accuracy and reliability of the current solenoid valve temperature measurement, and thus improves the temperature prediction accuracy.

[0032] When the predicted temperature at the next moment is higher than the over-temperature set value, the drive current of the solenoid valve is stepped down in stages, which to a certain extent reduces the risk of sudden current drop caused by over-temperature, resulting in mechanical shock and system failure. Description of the Drawings

[0033] Figure 1 It is a flowchart of the solenoid valve temperature control method for a continuously damped shock absorber according to an embodiment of the present application.

[0034] Figure 2 For the present application Figure 1 It is a flowchart for predicting the temperature at the next moment in step S2 of the present application.

[0035] Figure 3 It is a block diagram of the solenoid valve temperature control system for a continuously damped shock absorber according to an embodiment of the present application. Detailed Embodiments

[0036] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0037] First, some technical terms in the present application are explained to facilitate the understanding of the present application by those skilled in the art.

[0038] PWM: Pulse Width Modulation, Pulse Width Modulation.

[0039] To make the purpose, technical solution and advantages of the present application clearer, the following will further describe the embodiments of the present application in detail in conjunction with the accompanying drawings.

[0040] In a first aspect, an embodiment of the present application provides a solenoid valve temperature control method for a continuously damped shock absorber.

[0041] In one embodiment, as shown in Figure 1 The above solenoid valve temperature control method includes:

[0042] S1. Real-time collect the current drive voltage, current drive current and duty cycle of the current PWM of the solenoid valve, calculate the current resistance and current input power, and calculate the current solenoid valve temperature by using bilinear interpolation based on the preset three-dimensional mapping relationship of duty cycle-resistance-temperature.

[0043] S2. Obtain the heat capacity, static thermal resistance of the solenoid valve, and the current ambient temperature. Combine the current solenoid valve temperature, current input power, and a preset time step to predict the temperature T at the next moment. pred .

[0044] S3. Judge whether T pred is higher than the over-temperature set value. If so, enter S4; if not, enter S5.

[0045] S4. Enter the over-temperature protection mode. Reduce the current drive current to the first set value within the first preset time, and maintain the current of the first set value for the second preset time to promote the drop of T pred .

[0046] S5. Enter the normal protection mode. Judge whether T pred is higher than the second set value. If so, enter step S6; if not, enter S7.

[0047] S6. Reduce the target current, where the second set value is less than the over-temperature set value.

[0048] S7. Do not adjust the target current.

[0049] In this embodiment, by calculating the current temperature based on the duty cycle-resistance-temperature three-dimensional mapping relationship, no additional temperature sensor is required, effectively improving the temperature measurement accuracy and reducing the technical cost. By predicting the future temperature change and adjusting the current in advance, according to the predicted temperature, a dual-mode temperature dynamic management strategy of normal protection mode and over-temperature protection mode is adopted, which can realize the active management of the solenoid valve temperature, realize the closed-loop monitoring of temperature rise without a temperature sensor, and thus effectively avoid overheat faults. When the temperature is too high, by grading and reducing the drive current of the solenoid valve, first, quickly reduce the current to a safe level to slow down the temperature rise; then, maintain a lower current in the steady state to promote the temperature drop. If the temperature fails to return to the safe range within the set time, the system will cut off the current output and bypass the solenoid valve to avoid hardware damage. Through this step-by-step current reduction and shutdown mechanism, it can smoothly handle the over-temperature situation, reduce the risk brought by sudden faults, play a role in softening the faults, and thus effectively reduce the mechanical impact force of the solenoid valve, improving the reliability and safety of the EDC (Electronic Damper Control) shock absorber solenoid valve.

[0050] Further, in one embodiment, as shown in Figure 2 , in the above step S2, predicting the temperature T at the next moment pred , includes:

[0051] S21. Perform sliding window filtering on the current solenoid valve temperature to obtain the smoothed temperature. In this embodiment, the window length N = 4, and the weight coefficient decays exponentially.

[0052] S22. Calculate the current heat dissipation power according to the above static thermal resistance, current ambient temperature, current solenoid valve temperature, and preset time step.

[0053] S23. Predict the temperature T at the next moment according to the above current solenoid valve temperature, current input power, current heat dissipation power, heat capacity of the solenoid valve, and preset time step. pred .

[0054] In this embodiment, by performing sliding window filtering on the current solenoid valve temperature and outputting the smoothed temperature, the influence of instantaneous temperature fluctuations can be reduced.

[0055] Further, in one embodiment, another embodiment for predicting the temperature T at the next moment is provided, specifically including: pred The following is:

[0056] Predict the temperature T at the next moment according to the current switching loss power, current vibration additional loss power, current solenoid valve temperature, current input power, current heat dissipation power, heat capacity of the solenoid valve, and preset time step according to the following formula. pred :

[0057]

[0058] Among them, P in represents the current input power, P sw represents the current switching loss power, P road represents the current vibration additional loss power, C th represents the heat capacity of the solenoid valve, which can be obtained by fitting through a transient heating experiment.

[0059] The above current switching loss power can be obtained by acquiring the solenoid valve switching frequency and calculating. The above current vibration additional loss power can be obtained by querying the preset road condition - loss table according to the current road condition level. The above current heat dissipation power can be obtained by acquiring the current vehicle speed and combining the current ambient temperature, static thermal resistance, and preset vehicle speed influence coefficient. The specific calculation formula is as follows:

[0060]

[0061] Among them, P coding represents the current heat dissipation power, T filt represents the smoothed temperature, T amb represents the current ambient temperature, which can be the body temperature sensor data obtained through the CAN signal, k vel represents the vehicle speed influence coefficient, v represents the current vehicle speed, R tho represents the static thermal resistance, which can be measured through a steady - state temperature rise experiment.

[0062] In this embodiment, when predicting the temperature at the next moment, by combining the solenoid valve switching frequency, the current road condition level, and the current vehicle speed, the temperature prediction accuracy is effectively improved.

[0063] In this embodiment, before calculating the current heat dissipation power, the operation of performing sliding window filtering on the current solenoid valve temperature in the above S21 step may also be executed.

[0064] Further, in one embodiment, when T pred is not higher than the over-temperature set value, in the normal protection mode, a second set value smaller than the over-temperature set value is preset, and the magnitude relationship between T pred and the second set value is judged:

[0065] If T pred is not higher than the second set value, the target current is not adjusted.

[0066] If T pred is between the second set value and the over-temperature set value, the target current is derated.

[0067] In this embodiment, when T pred is not higher than the second set value, the target current is not adjusted, thereby relaxing the upper limit of the target current. On the premise of ensuring the safety of the solenoid valve current, higher damping requirements can be met. When T pred is between the second set value and the over-temperature set value, the upper limit of the target current is dynamically tightened to slow down the temperature rise.

[0068] Further, in one embodiment, a limit range of the target current is preset in advance. The maximum current of the limit range is set according to the solenoid valve capacity, and the minimum current of the limit range is set to the current that can ensure the lowest damping force of the shock absorber. To ensure a smooth transition of the current change, the target current change rate needs to meet the constraint condition: |ΔI / Δt| ≤ β, where ΔI / Δt represents the target current change rate, and β represents the maximum value of the target current change rate.

[0069] The limit range of the target current I target is set as: I min ≤ I target ≤ I max , I min represents the minimum target current, and I max represents the maximum target current. The value of I max is limited by the hardware capabilities (such as the coil heating limit and the drive current capacity), and it is ensured that the solenoid valve temperature does not exceed the safe range. I min is set to the current value that can ensure the lowest damping force to avoid damping failure caused by too low current.

[0070] The limit range of the target current is dynamically adjusted based on the ambient working conditions, including: when the vehicle is bumping at high speed, increasing the maximum value of the limit range; when the solenoid valve is under long-term load or in a high-temperature environment, reducing the maximum value of the limit range.

[0071] In this embodiment, the maximum value of the current is dynamically adjusted according to the temperature change. When the temperature approaches the upper limit, the system will reduce the maximum current to prevent the temperature from rising further. To ensure a smooth transition of the current, the change rate of the target current is limited to ensure that the target current does not change abruptly, so as to reduce the impact on the hardware.

[0072] Further, in one embodiment, the relationship between T pred and the over-temperature set value can also be judged through a preset temperature range, and the target current I target is adjusted, including a first temperature range, a second temperature range and a third temperature range, as shown in the following formula:

[0073]

[0074] Among them, I target represents the set target current, α represents the derating coefficient, which can be calibrated and obtained, T 1 represents the boundary value between the first temperature range and the first temperature range, and T 2 represents the boundary value between the second temperature range and the third temperature range. Specifically:

[0075] B11. When T pred ≤T 1 , it is in the first temperature range, and the target current is not adjusted.

[0076] B12. When T 1 ≤T pred ≤T 2 , it is in the second temperature range, and the target current is updated according to the derating formula of this range.

[0077] B13. When T pred >T 2 , it is in the third temperature range, and the over-temperature protection mode is entered, and the target current is adjusted in stages, including first-level derating, second-level holding and third-level shutdown, as shown in the following formula:

[0078]

[0079] Among them, I in represents the current driving current, γ represents the load reduction rate, t 1 represents the first preset time, t 2 represents the second preset time, I safe represents the first set current value, and T 2Represents the safe current value, specifically:

[0080] B131. The current driving current is derated to the first set current value I within the first preset time t 1 within safe .

[0081] B132. After t 1 , maintain I safe for the second preset time t 2 .

[0082] B133. When reaching t 2 , if it drops below the over-temperature set value and continues for the preset hysteresis time, stop derating the driving current and exit the over-temperature protection mode; if T pred does not drop below the safe current value T 2 , cut off the PWM output, bypass the solenoid valve, and report a high-temperature fault code.

[0083] In this embodiment, in the normal mode, according to the predicted temperature at the next moment, the current is adjusted in real time. When the temperature approaches the set upper limit, the target current is gradually attenuated to prevent the current from exceeding the preset safe range, and at the same time, derating is performed in advance when the temperature rising trend occurs. The degree of current derating is proportional to the increase in temperature and is controlled by the derating coefficient. When the temperature exceeds the preset over-temperature threshold, it automatically enters the over-temperature protection mode and performs hierarchical load reduction to quickly reduce the current to a safe level. By setting the hysteresis time, when the temperature exceeds the over-temperature set value, it enters and remains in the over-temperature protection mode until the temperature drops and remains below the set safe current value for a period of time before exiting the protection mode, improving the stability of temperature control.

[0084] Furthermore, in the above embodiment, the upper limit value setting formula of the target current is:

[0085]

[0086] wherein, I max_normal represents the preset maximum current value.

[0087] Second, based on the above solenoid valve temperature control method of the continuously damped control shock absorber, an embodiment of the solenoid valve temperature control system of the continuously damped control shock absorber is provided. As shown in Figure 3 , the above system includes an acquisition module, a calculation module, a prediction module, and a derating module, specifically:

[0088] The acquisition module is used to collect the current driving voltage, current driving current, and current PWM duty cycle of the solenoid valve in real time.

[0089] A calculation module for calculating the current resistance and current input power, and calculating the current solenoid valve temperature based on a preset three-dimensional mapping relationship of duty ratio-resistance-temperature.

[0090] A prediction module for obtaining the heat capacity, static thermal resistance of the solenoid valve and the current ambient temperature, and predicting the temperature T at the next moment in combination with the current solenoid valve temperature, current input power and a preset time step. pred .

[0091] A derating module for derating the current drive current.

[0092] If T pred is higher than the over-temperature set value, derate the current drive current to the first set value within the first preset time; maintain the first set value current for the second preset time to promote the fall of T pred .

[0093] Furthermore, in one embodiment, the above solenoid valve temperature control system further includes an exit module and a cut-off module. Specifically:

[0094] An exit module, when the second preset time ends, after T pred falls below the over-temperature set value and lasts for a preset hysteresis time, it is used to exit the over-temperature protection mode.

[0095] A cut-off module, when the second preset time ends and T pred does not fall below the over-temperature set value, it is used to cut off the drive current of the solenoid valve and bypass the solenoid valve.

[0096] This application calculates the current resistance in real time according to the current drive voltage and current drive current of the solenoid valve, combines the preset three-dimensional mapping relationship of duty ratio-resistance-temperature, calculates the current solenoid valve temperature, and performs sliding window filtering processing on it to smooth the temperature, realizing the calculation of the solenoid valve temperature without a temperature sensor, reducing the cost, and effectively improving the accuracy and reliability of temperature measurement. Through the real-time monitoring of multi-source parameters, dynamically predict the temperature rise trend, actively adjust the current, avoid the rapid rise of temperature, and achieve more accurate thermal management and temperature control strategies to ensure the thermal stability of the damping control system within the full operating range. Build a hierarchical thermal protection mechanism, through hysteresis control, to avoid mechanical shock and system failure caused by sudden temperature surges.

[0097] In addition, this application is compatible with multiple models of solenoid valves, has strong compatibility, and can reduce the probability of false triggering by continuously monitoring the temperature and current in cycles, improve the anti-interference ability, ensure the stable operation of the solenoid valve under different working conditions, and increase the reliability and durability of the equipment.

[0098] It should be noted that the serial numbers of the above embodiments of this application are only for description and do not represent the advantages and disadvantages of the embodiments.

[0099] In the description of the embodiments of the present application, the terms "comprising", "having" and any variations thereof in the specification, claims and the above-mentioned drawings are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally further include steps or units not listed, or may optionally further include other steps or units inherent to these processes, methods, products or devices. Descriptions such as "first", "second", and "third" are used to distinguish different objects, etc., and do not represent a sequence, nor do they limit that "first", "second", and "third" are different types.

[0100] In the description of the embodiments of the present application, words such as "exemplary", "for example" or "for illustration" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "exemplary", "for example" or "for illustration" in the embodiments of the present application should not be construed as being more preferred or having more advantages than other embodiments or designs. Rather, the use of words such as "exemplary", "for example" or "for illustration" is intended to present relevant concepts in a specific manner.

[0101] In some processes described in the embodiments of the present application, multiple operations or steps appear in a specific order. However, it should be understood that these operations or steps may not be executed in the order in which they appear in the embodiments of the present application or may be executed in parallel. The serial numbers of the operations are only used to distinguish different operations, and the serial numbers themselves do not represent any order of execution. In addition, these processes may include more or fewer operations, and these operations or steps may be executed in sequence or in parallel, and these operations or steps may be combined.

[0102] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-described embodiment methods can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above and includes several instructions for causing a terminal device to execute the methods described in the various embodiments of the present application.

[0103] The above are only the preferred embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structural or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present application.

Claims

1. A solenoid valve temperature control method for a continuous damping control shock absorber, characterized in that: The method comprises: According to the current driving voltage, current driving current and current PWM duty cycle of the solenoid valve collected in real time, the current resistance and current input power are calculated, and based on the preset duty cycle-resistance-temperature three-dimensional mapping relationship, the current solenoid valve temperature is calculated; Obtain the thermal capacity, static thermal resistance and current ambient temperature of the solenoid valve, and combine the current solenoid valve temperature, current input power and preset time step to predict the temperature T at the next moment. pred ; If T pred If the overtemperature is higher than the set value, the current driving current is reduced to the first set value within the first preset time; the first set value current is maintained for the second preset time to promote T pred Fall back.

2. The solenoid valve temperature control method of a continuous damping control shock absorber according to claim 1, characterized in that: The predicted temperature T at the next moment pred ,include: Calculating the current heat dissipation power according to the static thermal resistance, the current ambient temperature, and the current solenoid valve temperature; According to the current solenoid valve temperature, current input power, current heat dissipation power, heat capacity of the solenoid valve and the preset time step, the temperature T at the next moment is predicted. pred .

3. The solenoid valve temperature control method of a continuous damping control shock absorber according to claim 1, characterized in that: The predicted temperature T at the next moment pred ,include: Obtain the switching frequency of the solenoid valve and calculate the current switching power loss; Obtain the current road condition level, and obtain the corresponding current vibration additional loss power based on a preset road condition-loss table; Get the current vehicle speed, and calculate the current heat dissipation power by combining the static thermal resistance, the current ambient temperature, the current solenoid valve temperature and the preset vehicle speed influence coefficient; According to the current solenoid valve temperature, current input power, current switch loss power, current vibration additional loss power, current heat dissipation power, heat capacity of the solenoid valve and the preset time step, the temperature T at the next moment is predicted. pred .

4. The solenoid valve temperature control method of a continuous damping control shock absorber according to claim 1, characterized in that: When T pred When the over-temperature setting value is not higher than the over-temperature setting value, if T pred If T is not higher than the second set value, the target current is not adjusted; pred The target current is derated between the second set value and the over-temperature set value; wherein the second set value is smaller than the over-temperature set value.

5. The solenoid valve temperature control method of a continuous damping control shock absorber according to claim 4, characterized in that: The target current limiting range is preset, the maximum current of the limiting range is set according to the solenoid valve capacity, and the minimum current of the limiting range is set to a current that can ensure the minimum damping force of the shock absorber.

6. The solenoid valve temperature control method of a continuous damping control shock absorber according to claim 4, characterized in that: The limit range of the target current is adjusted based on environmental conditions, including: when the vehicle is bumpy at high speed, the maximum value of the limit range is increased; when the solenoid valve is loaded for a long time or in a high temperature environment, the maximum value of the limit range is reduced.

7. The solenoid valve temperature control method of a continuous damping control shock absorber according to claim 1, characterized in that: After the second preset time has passed, T pred After the temperature falls below the overtemperature setting value and lasts for the preset hysteresis time, the drive current derating operation stops.

8. The solenoid valve temperature control method of a continuous damping control shock absorber according to claim 1, characterized in that: After the second preset time has passed, T pred If the temperature does not fall below the overtemperature setting value, the driving current of the solenoid valve is cut off and the solenoid valve is bypassed.

9. A solenoid valve temperature control system based on the solenoid valve temperature control method of the continuous damping control shock absorber according to any one of claims 1 to 8, characterized in that: The solenoid valve temperature control system comprises: The acquisition module is used to acquire the current driving voltage, current driving current and current PWM duty cycle of the solenoid valve in real time; A calculation module, which is used to calculate the current resistance and the current input power, and calculate the current solenoid valve temperature based on a preset duty cycle-resistance-temperature three-dimensional mapping relationship; The prediction module is used to obtain the thermal capacity, static thermal resistance and current ambient temperature of the solenoid valve, and predict the temperature T at the next moment by combining the current solenoid valve temperature, current input power and preset time step. pred ; A derating module, which is used to derating the current driving current; If T pred If the overtemperature is higher than the set value, the current driving current is reduced to the first set value within the first preset time; the first set value current is maintained for the second preset time to promote T pred Fall back.

10. The solenoid valve temperature control system of the continuous damping control shock absorber according to claim 9, characterized in that: The solenoid valve temperature control system also includes: Exit module, when the second preset time is over, T pred After falling back below the over-temperature set value and lasting for the preset hysteresis time, it is used to exit the over-temperature protection mode; Cut off the module, when the second preset time is over, T pred If the temperature does not fall below the over-temperature setting value, the driving current of the solenoid valve is cut off and the solenoid valve is bypassed, which is used to cut off the driving current of the solenoid valve and bypass the solenoid valve.

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