CDC shock absorber active temperature regulation control method and control system

Abstract

This invention relates to the field of automotive control technology, specifically to a method and control system for active temperature regulation of a CDC (Continuous Damping Control) shock absorber. The method includes: acquiring a first temperature of the fluid inside the CDC shock absorber; determining whether temperature regulation of the CDC shock absorber is needed based on the first temperature; when temperature regulation is not needed, acquiring vehicle operating information for the current sampling period; estimating a second temperature of the CDC shock absorber at the end of the current sampling period based on the vehicle operating information and the first temperature, while maintaining the current vehicle operating information unchanged; comparing the second temperature with a set temperature; and actively regulating the fluid temperature inside the CDC shock absorber by increasing the opening of the CDC control valve when the second temperature exceeds the set temperature. This application allows for the prediction of the fluid temperature inside the CDC shock absorber, ensuring that the CDC shock absorber maintains a good working condition at all times.

Description

Technical Field

[0001] This invention relates to the field of automotive control technology, specifically to a method and control system for active temperature regulation of a CDC shock absorber. Background Technology

[0002] Shock absorbers are a crucial component of a car's suspension system, primarily functioning to cushion impacts from the road surface, thereby improving vehicle comfort and handling. Among them, continuously damped controlled shock absorbers (CDC shock absorbers) are a new type of shock absorber that can adjust damping force in real time according to changes in road conditions and driving behavior, thus enhancing vehicle comfort and handling. The CDC system consists of CDC shock absorber assemblies located on all four wheels and controlled by a separate electronic control unit. The system uses sensors on the vehicle (such as body acceleration and lateral acceleration sensors) to monitor the vehicle's current driving status in real time (at least 100 times per second). The collected data is transmitted to the control unit, where it is processed and compared. The control unit then issues corresponding commands to the CDC control valve, adjusting the current output value to control the valve opening and provide damping adapted to the current road conditions.

[0003] In a CDC shock absorber, the piston reciprocates within the cylinder, causing the oil in the shock absorber housing to repeatedly flow from one chamber to another through the orifice of the CDC control valve. The friction between the orifice wall and the oil, as well as the friction within the liquid molecules, creates a damping force against vibration, converting the vibration energy of the vehicle body and frame into heat energy. This heat energy is absorbed by the oil and the shock absorber housing and then dissipated into the atmosphere. However, modern automotive shock absorbers commonly suffer from insufficient heat dissipation. Insufficient heat dissipation leads to excessively high oil temperatures, causing a decrease in oil viscosity, reduced damping effect, and significantly diminished damping performance. In severe cases, it can burn oil seals and wiring harnesses, resulting in oil leaks and shock absorber failure, severely impacting vehicle comfort and ride smoothness.

[0004] Currently, the heat dissipation method for CDC vibration dampers is passive, which means that the temperature of the CDC vibration damper is collected, and heat dissipation is started when the temperature of the CDC vibration damper exceeds the set value. An existing technology entitled "An Integrated Water-Cooling Heat Dissipation System for an Automobile Telescopic Shock Absorber" proposes a water-cooling heat dissipation structure for a shock absorber. This structure includes: an acceleration sensor, a temperature sensor, an electronic control unit, a water pump, and auxiliary devices. The acceleration sensor is mounted on the piston rod of the telescopic shock absorber to detect the shock absorber's acceleration and feeds the result back to the vehicle's electronic control unit to obtain the heat generation power of the oil inside the shock absorber. The temperature sensor is located on the outer wall of the oil reservoir on the body of the automobile telescopic shock absorber to obtain the temperature of the oil inside the shock absorber and feeds the result back to the electronic control unit. The control section of the water pump is connected to the vehicle's electronic control unit and controls the cooling water flow rate according to different acceleration and temperature signals. The auxiliary devices include a coolant tank, an annular coolant pipe, and a condenser connected in sequence. The annular coolant pipe spirals around the outer wall of the oil reservoir of the automobile shock absorber. Coolant flows through the annular coolant pipe to cool the oil inside the shock absorber and then returns to the coolant tank via the condenser.

[0005] This structure employs a water-cooling system to cool the shock absorber, effectively cooling the outer wall of the oil reservoir and preventing the oil temperature inside the shock absorber from rising and compromising its damping performance. However, this structure is complex, requiring a dedicated cooling water system for the shock absorber, including a coolant tank, annular cooling pipes, and a condenser. This system occupies a significant amount of space, making it difficult to accommodate in the already cramped space of a car. Furthermore, the control method used in this approach has certain limitations and does not adequately address the issue of heat dissipation from the shock absorber oil temperature rise. Summary of the Invention

[0006] The purpose of this application is to address the shortcomings of the aforementioned background technology and to provide an active temperature regulation and control method and control system for CDC vibration dampers.

[0007] The technical solution of this application is: an active temperature regulation and control method for a CDC vibration damper, comprising,

[0008] Collect the first temperature of the oil inside the CDC shock absorber, and determine whether the temperature of the CDC shock absorber needs to be adjusted based on the first temperature.

[0009] Acquire vehicle operating information for the current sampling period when temperature adjustment of the CDC damper is not required;

[0010] Based on the vehicle operating information of the current sampling period and the first temperature prediction, the second temperature of the CDC shock absorber at the end of this sampling period is estimated while keeping the current vehicle operating information unchanged.

[0011] The second temperature is compared with the set temperature, and when the second temperature exceeds the set temperature, the oil temperature in the CDC damper is actively regulated by increasing the opening of the CDC control valve of the CDC damper.

[0012] According to the active temperature regulation control method for a CDC vibration damper provided in this application, the method for determining whether the CDC vibration damper needs to be regulated based on a first temperature includes: comparing the first temperature with a first threshold; if the first temperature does not exceed the first threshold, it is determined that the CDC vibration damper does not need to be regulated at present; if the first temperature exceeds the first threshold, it is determined that the CDC vibration damper needs to be regulated at present.

[0013] According to the active temperature regulation control method for a CDC vibration damper provided in this application, the method for regulating the temperature of the CDC vibration damper includes: dividing the CDC control valve into multiple opening levels from small to large; if the first temperature exceeds a first threshold but does not exceed a second threshold, then the valve level of the CDC control valve is increased by one level based on the current valve opening level, and if the current valve level of the CDC control valve is the highest level, it remains unchanged; if the first temperature exceeds the second threshold but does not exceed a third threshold, then the valve level of the CDC control valve is increased by two levels based on the current valve opening level, and if the current valve level of the CDC control valve is the highest level, it remains unchanged; if the first temperature exceeds the third threshold, then the valve opening level of the CDC control valve is adjusted to the highest level;

[0014] The first threshold is less than the second threshold, which is less than the third threshold.

[0015] According to the active temperature regulation control method for a CDC damper provided in this application, the method for obtaining vehicle operating information in the current sampling period includes: obtaining the whole vehicle wheel-side acceleration signal, wheel-side height sensor signal and whole vehicle unsprung mass signal in the current sampling period.

[0016] According to the active temperature regulation control method for a CDC vibration damper provided in this application, the method for estimating the second temperature includes: calculating the second temperature according to the following formula.

[0017] T2=T1+μ0(μ1a+μ2h+μ3m)-T0

[0018] Where: T2—second temperature;

[0019] T1 — First temperature;

[0020] T0—The heat dissipation temperature of the CDC vibration damper during a single sampling period under the current environment;

[0021] a—wheel-side acceleration;

[0022] h — wheel edge height;

[0023] m—unsprung mass of the vehicle;

[0024] μ0 — Opening coefficient, which is related to the valve opening of the CDC control valve of the CDC damper;

[0025] μ1 — the first coefficient, which is related to the wheel-side acceleration;

[0026] μ2 — ​​the second coefficient, which is related to the wheel edge height;

[0027] μ3 – The third coefficient, which is related to the unsprung mass of the vehicle.

[0028] According to the active temperature regulation control method for a CDC damper provided in this application, the method for actively regulating the oil temperature inside the CDC damper includes: dividing the CDC control valve into multiple opening levels from small to large; if the second temperature exceeds a fourth threshold but does not exceed a fifth threshold, then the valve level of the CDC control valve is increased by one level based on the current valve opening level, and if the current valve level of the CDC control valve is the highest level, it remains unchanged; if the second temperature exceeds a fifth threshold but does not exceed a sixth threshold, then the valve level of the CDC control valve is increased by two levels based on the current valve opening level, and if the current valve level of the CDC control valve is the highest level, it remains unchanged; if the second temperature exceeds a sixth threshold, then the valve opening level of the CDC control valve is adjusted to the highest level; wherein the fourth threshold is less than the fifth threshold and less than the sixth threshold.

[0029] This application also provides an active temperature regulation control system for a CDC vibration damper, wherein the control system operates according to any of the above-described active temperature regulation control methods for a CDC vibration damper, including,

[0030] Temperature acquisition module, the temperature acquisition module is used to acquire the first temperature of the oil in the current CDC shock absorber;

[0031] The first judgment module determines whether the CDC vibration damper needs temperature adjustment based on the first temperature.

[0032] The first execution module is used to control the valve opening of the CDC control valve of the CDC damper to increase when the first judgment module determines that the temperature of the CDC damper needs to be adjusted.

[0033] The information acquisition module is used to acquire vehicle operation information in the current sampling period when the first judgment module determines that the temperature of the CDC shock absorber needs to be adjusted.

[0034] The temperature prediction module is based on the vehicle operating information of the current sampling period and the first temperature prediction module to predict the second temperature of the CDC shock absorber at the end of the current sampling period while keeping the current vehicle operating information unchanged.

[0035] The second judgment module is used to compare the second temperature and the set temperature to determine whether active temperature adjustment of the CDC damper is required.

[0036] The second execution module is used to increase the valve opening of the CDC control valve of the CDC damper when the second judgment module determines that active temperature regulation of the CDC damper is required.

[0037] According to the active temperature regulation control system for a CDC vibration damper provided in this application, the first judgment module is used to compare a first temperature with a first threshold, and make a judgment that the temperature regulation of the CDC vibration damper is not required when the first temperature does not exceed the first threshold, and make a judgment that the temperature regulation of the CDC vibration damper is required when the first temperature exceeds the first threshold.

[0038] According to the active temperature regulation and control system for a CDC vibration damper provided in this application, the first execution module includes...

[0039] The first valve opening degree classification module is used to classify the opening degree of the CDC control valve into multiple opening degree levels from small to large.

[0040] The first passive temperature regulation control module controls the CDC control valve to increase its opening level by one level based on the current valve opening level when the first temperature exceeds the first threshold but does not exceed the second threshold, and keeps it unchanged when the current valve opening level of the CDC control valve is the highest level.

[0041] The second passive temperature regulation control module controls the CDC control valve to increase its opening level by two levels based on the current valve opening level when the first temperature exceeds the second threshold but does not exceed the third threshold, and keeps it unchanged when the current valve opening level of the CDC control valve is the highest level.

[0042] The third passive temperature regulation control module controls the valve opening level of the CDC control valve to the highest level when the first temperature exceeds the third threshold.

[0043] The first threshold is less than the second threshold, which is less than the third threshold.

[0044] According to the active temperature regulation control system for a CDC damper provided in this application, the information acquisition module is used to acquire the wheel-side acceleration signal, wheel-side height sensor signal and unsprung mass signal of the vehicle in the current sampling period when the first judgment module determines that the temperature of the CDC damper needs to be regulated.

[0045] According to the active temperature regulation and control system for a CDC vibration damper provided in this application, the temperature prediction module is used to calculate a second temperature according to the following formula.

[0046] T2=T1+μ0(μ1a+μ2h+μ3m)-T0

[0047] Where: T2—second temperature;

[0048] T1 — First temperature;

[0049] T0—The heat dissipation temperature of the CDC vibration damper during a single sampling period under the current environment;

[0050] a—wheel-side acceleration;

[0051] h — wheel edge height;

[0052] m—unsprung mass of the vehicle;

[0053] μ0 — Opening coefficient, which is related to the valve opening of the CDC control valve of the CDC damper;

[0054] μ1 — the first coefficient, which is related to the wheel-side acceleration;

[0055] μ2 — ​​the second coefficient, which is related to the wheel edge height;

[0056] μ3 – The third coefficient, which is related to the unsprung mass of the vehicle.

[0057] According to the active temperature regulation control system for a CDC vibration damper provided in this application, the second execution module includes:

[0058] The second valve opening level classification module is used to classify the opening of the CDC control valve into multiple opening levels from small to large.

[0059] The first active temperature regulation control module controls the CDC control valve to increase its opening level by one level based on the current valve opening level when the second temperature exceeds the fourth threshold but does not exceed the fifth threshold, and keeps it unchanged when the current valve opening level of the CDC control valve is the highest level.

[0060] The second active temperature regulation control module controls the CDC control valve to increase its opening level by two levels based on the current valve opening level when the second temperature exceeds the fifth threshold but does not exceed the sixth threshold, and keeps it unchanged when the current valve opening level of the CDC control valve is the highest level.

[0061] The third active temperature regulation control module controls the valve opening level of the CDC control valve to the highest level when the second temperature exceeds the sixth threshold.

[0062] The fourth threshold is less than the fifth threshold and less than the sixth threshold.

[0063] The advantages of this application are: 1. This application can predict the temperature of the oil in the CDC shock absorber by collecting vehicle operating information, and make advance judgments on the CDC shock absorber. When it is predicted that the oil temperature in the CDC shock absorber may exceed the set temperature, the damping effect in the shock absorber is reduced by increasing the valve opening of the CDC control valve, so that the oil temperature in the CDC shock absorber rises more slowly. The entire control method is based on advance prediction, so the oil temperature in the CDC shock absorber does not exceed the set temperature. This active control and adjustment method can always maintain the CDC shock absorber in a good working temperature environment, so that the CDC shock absorber always has a good vibration reduction effect.

[0064] Moreover, this application does not require the configuration of dedicated water cooling equipment. By controlling the valve opening of the CDC control valve, no new equipment or facilities need to be added. The modification cost is extremely low, it does not take up any extra space, and the operating cost is also extremely low. It can start the temperature adjustment of the shock absorber before the temperature rises, and the shock absorber will not experience a rapid temperature rise that exceeds the normal operating temperature limit, and it will always be in good working condition.

[0065] 2. This application first determines the initial temperature of the oil in the CDC damper. If the initial temperature exceeds the set temperature, it indicates that the oil temperature in the CDC damper is too high and the oil temperature needs to be adjusted. In this case, the opening of the CDC control valve can be directly increased without further judgment, which further simplifies the entire control process of the CDC damper and improves the control efficiency of the CDC damper.

[0066] 3. This application proposes an operating method for passive control when the actual temperature of the oil in the CDC damper is too high. This application classifies the valve opening of the CDC control valve into different levels and increases the valve opening to different degrees according to the first temperature range. This achieves a balance between maintaining the damping effect of the CDC damper and slowing down the drop in oil temperature.

[0067] 4. The method of collecting vehicle operation information in this application is very simple. The heat generation power of the CDC shock absorber can be easily obtained by using the whole wheel side acceleration signal, the wheel side height sensor signal and the whole vehicle unsprung mass signal. The above information is directly related to the work done by the CDC shock absorber on the oil. By collecting the above information, the subsequent oil temperature rise can be obtained, which is convenient for calculation.

[0068] 5. The method for calculating the second temperature in this application is very simple. The corresponding coefficients of the whole vehicle wheel-side acceleration signal, wheel-side height sensor signal and unsprung mass signal are obtained through calibration test. Then, the corresponding second temperature can be calculated based on the corresponding formula. The overall calculation method is simple and easy to operate, and can accurately predict the oil temperature rise in the CDC shock absorber.

[0069] 6. This application proposes an operating method for active control when the estimated oil temperature in the CDC damper is too high. This application classifies the valve opening of the CDC control valve into stages and increases the valve opening to different degrees according to the second temperature range. This achieves a balance between maintaining the damping effect of the CDC damper and slowing down the oil temperature drop.

[0070] 7. This application also relates to a control system, which can be integrated into the vehicle's control system and operated according to the above control method. This can effectively ensure that the CDC shock absorber always has a good damping effect and maintain the temperature of the oil in the CDC shock absorber within a good temperature range.

[0071] This application allows for the control of CDC dampers by predicting the oil temperature inside the CDC damper. By judging based on the predicted temperature, the temperature adjustment of the damper can begin before the temperature rises, preventing the damper from rapidly exceeding the normal operating temperature limit and ensuring it remains in good working condition. Attached Figure Description

[0072] Figure 1 : Schematic diagram of the CDC vibration damper control process in this application. Detailed Implementation

[0073] The embodiments of this application are described in detail below, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0074] In the description of this application, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0075] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0076] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0077] This application relates to an active temperature regulation control method for CDC vibration dampers. This method can actively regulate the temperature of the CDC vibration damper. By predicting the temperature of the oil inside the CDC vibration damper, it determines whether active temperature regulation is needed. When active temperature regulation is required, the opening of the CDC control valve is increased to reduce damping, slowing down the oil flow rate and reducing the rate and magnitude of temperature rise. This achieves the purpose of proactive and early temperature control, preventing the oil inside the CDC vibration damper from rapidly rising above the set operating temperature and placing the CDC vibration damper in an unfavorable operating state. This control method of this application can always maintain the CDC vibration damper within a suitable temperature environment.

[0078] Specifically, such as Figure 1 As shown, the active temperature regulation and control method for a CDC vibration damper according to this application can be carried out according to the following steps:

[0079] S1. Collect the first temperature of the oil in the CDC shock absorber and determine whether the temperature of the CDC shock absorber needs to be adjusted based on the first temperature.

[0080] The CDC shock absorber is equipped with a temperature sensor that can collect the temperature of the oil inside the CDC shock absorber in real time, i.e., the first temperature mentioned above. The purpose of obtaining the first temperature is to determine whether the temperature of the CDC shock absorber needs to be directly adjusted. If the first temperature exceeds the set temperature, it means that the oil temperature inside the CDC shock absorber is too high and the temperature of the CDC shock absorber needs to be adjusted directly, without the need for subsequent operations. If the first temperature does not exceed the set temperature, it means that the current oil temperature inside the CDC shock absorber is in a suitable temperature environment, and the temperature of the CDC shock absorber does not need to be adjusted.

[0081] S2. Obtain vehicle operating information for the current sampling period when temperature adjustment of the CDC damper is not required;

[0082] The subsequent steps will only be carried out if it is determined in step S1 that the CDC vibration damper does not need temperature adjustment. The determination in step S1 that the CDC vibration damper does not need temperature adjustment only means that the CDC vibration damper is currently in a suitable temperature environment, and does not mean that the temperature of the CDC vibration damper will not rise in the future and that the CDC vibration damper does not need temperature adjustment.

[0083] This application involves periodic sampling control. By collecting vehicle operating information during a certain sampling period, the collected vehicle operating information is related to the work done on the CDC shock absorber. That is, by collecting vehicle operating information related to the work done on the CDC shock absorber, the temperature rise of the CDC shock absorber can be predicted based on this sampling information. The more work is done on the CDC shock absorber, the greater the temperature rise of the oil inside the CDC shock absorber, and vice versa.

[0084] S3. Based on the vehicle operating information of the current sampling period and the first temperature, estimate the second temperature of the CDC shock absorber at the end of the current sampling period while keeping the current vehicle operating information unchanged.

[0085] After collecting the vehicle operation information for this sampling cycle, the second temperature after the end of this sampling cycle can be calculated by combining the current first temperature. The second temperature is the estimated temperature, which is the CDC damper temperature after the end of this sampling cycle under the premise of keeping the current vehicle operation information unchanged. It is based on an assumption.

[0086] S4. Compare the second temperature with the set temperature, and when the second temperature exceeds the set temperature, actively regulate the oil temperature in the CDC damper by increasing the opening of the CDC control valve of the CDC damper.

[0087] By comparing the estimated second temperature with the set temperature, it can be determined whether active cooling of the CDC vibration damper is necessary. If the second temperature exceeds the set temperature, it indicates that without adjustment, the CDC vibration damper's temperature will exceed the set temperature by the end of this sampling cycle, potentially resulting in an unsuitable operating condition. To avoid this, active temperature regulation of the CDC vibration damper is required. If the second temperature does not exceed the set temperature, the valve opening of the CDC control valve does not need to be adjusted, or the valve opening can be reduced.

[0088] The temperature regulation in this application is achieved by changing the valve opening of the CDC control valve of the CDC damper. When the valve opening increases, the oil damping decreases, and the magnitude and speed of the temperature rise of the oil in the CDC damper will be greatly reduced. In fact, the damping performance of the CDC damper is sacrificed to achieve the purpose of temperature regulation.

[0089] In some embodiments of this application, the above step S1 has been optimized. Specifically, the method for determining whether the CDC vibration damper needs to be temperature-adjusted based on the first temperature includes: comparing the first temperature with a first threshold; if the first temperature does not exceed the first threshold, it is determined that the CDC vibration damper does not need to be temperature-adjusted at present; if the first temperature exceeds the first threshold, it is determined that the CDC vibration damper needs to be temperature-adjusted at present.

[0090] By judging the first temperature, the current working status of the CDC damper can be obtained, and it can be determined whether the CDC damper is in a suitable temperature range. If the first temperature of the CDC damper exceeds the first threshold, it proves that the oil temperature inside the CDC damper is too high. It is necessary to increase the valve opening of the CDC control valve. By sacrificing part of the damping system of the CDC damper, the purpose of delaying the rate of oil temperature rise and reducing the magnitude of oil temperature rise can be achieved.

[0091] The first threshold can be set to 30℃. When the CDC shock absorber is working normally, its internal oil temperature ranges from 0℃ to 32℃. The first threshold does not exceed the normal operating limit of the CDC shock absorber. When the first temperature approaches the first threshold, it indicates that the oil temperature inside the CDC shock absorber is close to the normal operating limit, and the temperature of the CDC shock absorber needs to be adjusted in advance. Otherwise, the oil temperature will quickly exceed the limit, putting the CDC shock absorber in an unsuitable working condition. The above values ​​can be selected according to actual needs and are not limited to them, as long as the actual requirements are met.

[0092] Specifically, the method for temperature regulation of the CDC damper is as follows: the valve opening of the CDC control valve is divided into multiple opening levels from small to large. In this embodiment, the valve opening of the CDC control valve is divided into five levels, namely 0-20%, 20%-40%, 40%-60%, 60%-80%, and 80%-100%. The higher the level, the larger the valve opening and the smaller the damping. Of course, the valve opening can also be divided into levels in other ways, as long as the actual needs are met.

[0093] When the temperature of the CDC damper exceeds the first threshold, the temperature of the oil inside the CDC damper is too high, and the temperature of the CDC damper needs to be adjusted in time. At this time, the adjustment is a passive adjustment when the oil temperature is already too high, and the appropriate temperature adjustment method needs to be selected according to the current first temperature.

[0094] If the first temperature exceeds the first threshold but does not exceed the second threshold, the valve level of the CDC control valve is increased by one level based on the current valve opening level. If the current valve level of the CDC control valve is the highest level, it remains unchanged. If the first temperature exceeds the second threshold but does not exceed the third threshold, the valve level of the CDC control valve is increased by two levels based on the current valve opening level. If the current valve level of the CDC control valve is the highest level, it remains unchanged. If the first temperature exceeds the third threshold, the valve opening level of the CDC control valve is adjusted to the highest level.

[0095] That is, different adjustment methods are selected for different temperature ranges of the first temperature. If the first temperature does not exceed the first threshold by a large margin, in order to balance the vibration damping performance and temperature regulation effect of the CDC damper, it is only necessary to increase the valve opening by one level from the existing level, slightly increasing the valve opening to achieve the effect of delaying the temperature rise and reducing the temperature rise rate. If the first temperature exceeds the first threshold by a large margin, the valve opening needs to be expanded to a greater extent to rapidly reduce the rise rate and speed of the oil temperature in the CDC damper. Based on this principle, the passive temperature regulation control method for the CDC damper of this application is constructed.

[0096] Of course, if in this embodiment the first temperature exceeds the first threshold and the CDC control valve of the CDC damper is already at the highest level, it is impossible to further increase the valve opening, so the current maximum valve opening can be maintained.

[0097] In this embodiment, the first threshold is 30℃, the second threshold is 35℃, and the third threshold is 40℃. These values ​​can be selected according to actual needs and are not limited to them, as long as the actual requirements are met.

[0098] The temperature rise mentioned above in this embodiment refers to the increase in the temperature of the oil inside the CDC vibration damper caused by the work done on the CDC vibration damper during operation, thus negating the heat dissipation effect of the CDC vibration damper itself. In actual applications, the temperature change of the oil inside the CDC vibration damper is a synergistic effect of both the work done on the CDC vibration damper and the heat dissipation of the CDC vibration damper. The work done on the CDC vibration damper will cause the internal oil temperature to rise, and the heat dissipation of the CDC vibration damper will cause the internal oil temperature to drop. In this embodiment, the change in the oil temperature rise caused by the work done on the CDC vibration damper is altered by controlling the valve opening. When the opening of the CDC control valve of the CDC vibration damper increases, the damping decreases, and the rate and magnitude of the temperature rise under the same work done per unit time will decrease, while the heat dissipation effect of the CDC vibration damper remains unchanged (the external environment remains unchanged, the structure of the CDC vibration damper remains unchanged, therefore the heat dissipation effect of the CDC vibration damper per unit time remains unchanged). One aspect decreases, and the other remains unchanged. Therefore, overall, the magnitude and rate of temperature rise of the oil inside the CDC vibration damper will decrease (compared to the case where the valve opening is not adjusted).

[0099] In some other embodiments of this application, step S2 above has been optimized. When it is determined that the temperature of the CDC damper does not need to be adjusted at present, it proves that the temperature of the oil in the CDC damper is within a suitable temperature range. However, this does not mean that the temperature of the CDC damper will still be within a suitable range at some point in the future. In order to keep the CDC damper always within a suitable temperature range, it is necessary to estimate the second temperature of the CDC damper.

[0100] The factors influencing the work done on the CDC damper mainly involve three levels: the wheel-side acceleration signal, the wheel-side height sensor signal, and the vehicle's unsprung mass signal during the current sampling period. Wheel-side acceleration can be acquired through an acceleration sensor, wheel-side height through a wheel-side height sensor, and vehicle's unsprung mass through a weight sensor. The greater the wheel-side acceleration, the greater the work done on the CDC damper; the two are positively correlated. Similarly, wheel-side height and vehicle's unsprung mass are also positively correlated with the work done on the CDC damper. By acquiring these three signal data at the beginning of the current sampling period, the work power done on the CDC damper during this sampling period can be calculated under the current operating conditions. Obtaining this work power allows for the calculation of the increase in oil temperature caused by the work done on the CDC damper during this sampling period. Combining this with the current oil temperature and the CDC damper's heat dissipation temperature, the oil temperature inside the CDC damper at the end of the current sampling period can be estimated, i.e., the second temperature.

[0101] The specific method for estimating the second temperature is as follows: calculate the second temperature using the following formula.

[0102] T2=T1+μ0(μ1a+μ2h+μ3m)-T0

[0103] Where: T2—second temperature;

[0104] T1 – The first temperature, collected by a temperature sensor inside the CDC shock absorber;

[0105] T0—The heat dissipation temperature of the CDC vibration isolator within a single sampling period under the current environment. It is related to the heat dissipation mode of the CDC vibration isolator. For example, if the CDC vibration isolator adopts the air-cooled heat dissipation mode, then this value is related to the external structure of the CDC vibration isolator and the wind speed of the current environment. By determining the heat exchange area between the CDC vibration isolator and the external environment and the wind speed of the current environment, the temperature change value within a single sampling period can be obtained. This value can be obtained through calibration, stored in the control system, and called up accordingly in actual applications.

[0106] a — Wheel-side acceleration, obtained from acceleration sensors;

[0107] h—Wheel edge height, obtained based on height sensor data;

[0108] m—Unsprung mass of the vehicle, obtained based on data collected by a weight sensor;

[0109] μ0 — Opening coefficient, which is related to the opening degree of the CDC control valve of the CDC damper. The larger the opening degree of the CDC control valve, the smaller the opening coefficient, and vice versa. The opening coefficient is related to the structure of the CDC control valve and is obtained through calibration.

[0110] μ1 — the first coefficient, which is related to the wheel-side acceleration. The greater the wheel-side acceleration, the larger the first coefficient, and vice versa. It is obtained through calibration.

[0111] μ2 — ​​the second coefficient, which is related to the wheel edge height. The greater the wheel edge height, the larger the second coefficient, and vice versa. It is obtained through calibration.

[0112] μ3 – The third coefficient, which is related to the unsprung mass of the vehicle. The larger the unsprung mass of the vehicle, the larger the third coefficient, and vice versa. It is obtained through calibration.

[0113] The second temperature at the end of the current sampling cycle can be calculated using the above method. The second temperature is the estimated temperature, which represents the temperature at the end of the current sampling cycle while maintaining the current vehicle operating information.

[0114] By comparing and analyzing the second temperature, it can be determined whether active temperature regulation of the CDC damper is required. Specifically, the method for active temperature regulation of the oil inside the CDC damper is as follows: Similarly, the valve opening of the CDC control valve can be graded according to the above method, for example, from low to high: 0-20%, 20%-40%, 40%-60%, 60%-80%, and 80%-100%. The higher the grade, the larger the valve opening and the smaller the damping. The valve opening can also be graded in other ways, as long as the actual needs are met.

[0115] If the first temperature exceeds the fourth threshold but does not exceed the fifth threshold, the valve level of the CDC control valve is increased by one level based on the current valve opening level. If the current valve level of the CDC control valve is the highest level, it remains unchanged. If the second temperature exceeds the fifth threshold but does not exceed the sixth threshold, the valve level of the CDC control valve is increased by two levels based on the current valve opening level. If the current valve level of the CDC control valve is the highest level, it remains unchanged. If the second temperature exceeds the sixth threshold, the valve opening level of the CDC control valve is adjusted to the highest level. The fourth threshold is less than the fifth threshold and less than the sixth threshold.

[0116] The fourth, fifth, and sixth thresholds can be the same as the first, second, and third thresholds, such as the fourth threshold being 30℃, the fifth threshold being 35℃, and the sixth threshold being 40℃. Alternatively, they can be different; the settings can be chosen according to the application requirements.

[0117] In actual control: such as Figure 1 As shown, the system collects the first temperature of the oil in the CDC damper. If the first temperature exceeds a first threshold, it determines that the CDC damper needs temperature adjustment. If the first temperature exceeds the first threshold but does not exceed the second threshold, the valve level of the CDC control valve is increased by one level based on the current valve opening level. If the current valve level of the CDC control valve is the highest level, it remains unchanged. If the first temperature exceeds the second threshold but does not exceed the third threshold, the valve level of the CDC control valve is increased by two levels based on the current valve opening level. If the current valve level of the CDC control valve is the highest level, it remains unchanged. If the first temperature exceeds the third threshold, the valve opening level of the CDC control valve is adjusted to the highest level.

[0118] If the first temperature does not exceed the first threshold, it is determined that no temperature adjustment of the CDC damper is needed at present. The wheel-side acceleration signal, wheel-side height sensor signal, and unsprung mass signal of the whole vehicle are obtained during the current sampling period, and the second temperature is calculated according to the following formula.

[0119] T2=T1+μ0(μ1a+μ2h+μ3m)-T0

[0120] Where: T2—second temperature;

[0121] T1 — First temperature;

[0122] T0—The heat dissipation temperature of the CDC vibration damper during a single sampling period under the current environment;

[0123] a—wheel-side acceleration;

[0124] h — wheel edge height;

[0125] m—unsprung mass of the vehicle;

[0126] μ0 — Opening coefficient, which is related to the valve opening of the CDC control valve of the CDC damper;

[0127] μ1 — the first coefficient, which is related to the wheel-side acceleration;

[0128] μ2 — ​​the second coefficient, which is related to the wheel edge height;

[0129] μ3 — the third coefficient, which is related to the unsprung mass of the vehicle;

[0130] If the second temperature exceeds the fourth threshold but does not exceed the fifth threshold, the valve level of the CDC control valve is increased by one level based on the current valve opening level. If the current valve level of the CDC control valve is the highest level, it remains unchanged. If the second temperature exceeds the fifth threshold but does not exceed the sixth threshold, the valve level of the CDC control valve is increased by two levels based on the current valve opening level. If the current valve level of the CDC control valve is the highest level, it remains unchanged. If the second temperature exceeds the sixth threshold, the valve opening level of the CDC control valve is adjusted to the highest level.

[0131] In addition, this application also relates to an active temperature regulation control system for a CDC shock absorber, including a temperature acquisition module, a first judgment module, a first execution module, an information acquisition module, a temperature estimation module, a second judgment module, and a second execution module. The temperature acquisition module is used to acquire the first temperature of the oil in the CDC shock absorber. The first judgment module determines whether the CDC shock absorber needs temperature regulation based on the first temperature. The first execution module is used to increase the valve opening of the CDC control valve of the CDC shock absorber when the first judgment module determines that the CDC shock absorber needs temperature regulation. The information acquisition module is used to acquire the vehicle operation information of the current sampling period when the first judgment module determines that the CDC shock absorber needs temperature regulation. The temperature estimation module estimates the second temperature of the CDC shock absorber at the end of the current sampling period based on the vehicle operation information of the current sampling period and the first temperature, while maintaining the current vehicle operation information unchanged. The second judgment module is used to compare the second temperature and the set temperature to determine whether the CDC shock absorber needs active temperature regulation. The second execution module is used to increase the valve opening of the CDC control valve of the CDC shock absorber when the second judgment module determines that the CDC shock absorber needs active temperature regulation.

[0132] The first judgment module is used to compare the first temperature with the first threshold. When the first temperature does not exceed the first threshold, it makes a judgment that the temperature adjustment of the CDC vibration damper is not required. When the first temperature exceeds the first threshold, it makes a judgment that the temperature adjustment of the CDC vibration damper is required.

[0133] The first execution module includes a first valve opening level classification module, a first passive temperature regulation control module, a second passive temperature regulation control module, and a third passive temperature regulation control module. The first valve opening level classification module is used to divide the opening of the CDC control valve into multiple opening levels from small to large. When the first temperature exceeds a first threshold but does not exceed a second threshold, the first passive temperature regulation control module controls the CDC control valve to increase its opening level by one level based on the current valve opening level, and maintains the same level when the current valve opening level of the CDC control valve is the highest level. When the first temperature exceeds a second threshold but does not exceed a third threshold, the second passive temperature regulation control module controls the CDC control valve to increase its opening level by two levels based on the current valve opening level, and maintains the same level when the current valve opening level of the CDC control valve is the highest level. When the first temperature exceeds a third threshold, the third passive temperature regulation control module controls the CDC control valve to maintain the highest valve opening level. The first threshold is less than the second threshold and less than the third threshold.

[0134] The information acquisition module is used to acquire the wheel-side acceleration signal, wheel-side height sensor signal, and unsprung mass signal of the vehicle during the current sampling period when the first judgment module determines that the temperature adjustment of the CDC shock absorber is required.

[0135] The temperature prediction module is used to calculate the second temperature according to the following formula:

[0136] T2=T1+μ0(μ1a+μ2h+μ3m)-T0

[0137] Where: T2—second temperature;

[0138] T1 — First temperature;

[0139] T0—The heat dissipation temperature of the CDC vibration damper during a single sampling period under the current environment;

[0140] a—wheel-side acceleration;

[0141] h — wheel edge height;

[0142] m—unsprung mass of the vehicle;

[0143] μ0 — Opening coefficient, which is related to the valve opening of the CDC control valve of the CDC damper;

[0144] μ1 — the first coefficient, which is related to the wheel-side acceleration;

[0145] μ2 — ​​the second coefficient, which is related to the wheel edge height;

[0146] μ3 – The third coefficient, which is related to the unsprung mass of the vehicle.

[0147] The second execution module includes a second valve opening level classification module, a first active temperature regulation control module, a second active temperature regulation control module, and a third active temperature regulation control module. The second valve opening level classification module is used to divide the opening of the CDC control valve into multiple opening levels from small to large. The first active temperature regulation control module controls the CDC control valve to increase its opening level by one level when the second temperature exceeds a fourth threshold but does not exceed a fifth threshold, and maintains the same level when the current valve level is the highest. The second active temperature regulation control module controls the CDC control valve to increase its opening level by two levels when the second temperature exceeds a fifth threshold but does not exceed a sixth threshold, and maintains the same level when the current valve level is the highest. The third active temperature regulation control module controls the CDC control valve to maintain the highest valve opening level when the second temperature exceeds a sixth threshold. The fourth threshold is less than the fifth threshold and less than the sixth threshold.

[0148] The foregoing has shown and described the basic principles, main features, and advantages of this application. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this application. Various changes and modifications can be made to this application without departing from the spirit and scope thereof, and all such changes and modifications fall within the scope of this application as claimed. The scope of protection of this application is defined by the appended claims and their equivalents.

Claims

1. A method for active temperature regulation and control of a CDC vibration damper, characterized in that: include, Collect the first temperature of the oil inside the CDC shock absorber, and determine whether the temperature of the CDC shock absorber needs to be adjusted based on the first temperature. Acquire vehicle operating information for the current sampling period when temperature adjustment of the CDC damper is not required; Based on the vehicle operating information of the current sampling period and the first temperature prediction, the second temperature of the CDC shock absorber at the end of this sampling period is estimated while keeping the current vehicle operating information unchanged. The second temperature is compared with the set temperature, and when the second temperature exceeds the set temperature, the oil temperature in the CDC damper is actively regulated by increasing the opening of the CDC control valve of the CDC damper. The method for determining whether temperature adjustment of the CDC vibration damper is required based on a first temperature includes: comparing the first temperature with a first threshold; if the first temperature does not exceed the first threshold, it is determined that temperature adjustment of the CDC vibration damper is not required at present; if the first temperature exceeds the first threshold, it is determined that temperature adjustment of the CDC vibration damper is required at present. The method for temperature regulation of the CDC damper includes: dividing the CDC control valve into multiple opening levels from small to large; if the first temperature exceeds a first threshold but does not exceed a second threshold, then the valve level of the CDC control valve is increased by one level based on the current valve opening level, and if the current valve level of the CDC control valve is the highest level, it remains unchanged; if the first temperature exceeds the second threshold but does not exceed a third threshold, then the valve level of the CDC control valve is increased by two levels based on the current valve opening level, and if the current valve level of the CDC control valve is the highest level, it remains unchanged; if the first temperature exceeds the third threshold, then the valve opening level of the CDC control valve is adjusted to the highest level. The first threshold is less than the second threshold, which is less than the third threshold.

2. The active temperature regulation and control method for a CDC vibration damper as described in claim 1, characterized in that: The method for estimating the second temperature includes calculating the second temperature according to the following formula. Where: T2—second temperature; T1 — First temperature; T0—The heat dissipation temperature of the CDC vibration damper during a single sampling period under the current environment; a—wheel-side acceleration; h — wheel edge height; m—unsprung mass of the vehicle; μ0 — Opening coefficient, which is related to the valve opening of the CDC control valve of the CDC damper; μ1 — the first coefficient, which is related to the wheel-side acceleration; μ2 — ​​the second coefficient, which is related to the wheel edge height; μ3 – The third coefficient, which is related to the unsprung mass of the vehicle.

3. The active temperature regulation and control method for a CDC vibration damper as described in claim 1, characterized in that: The method for actively regulating the oil temperature inside the CDC damper includes: dividing the CDC control valve into multiple opening levels from small to large; if the second temperature exceeds the fourth threshold but does not exceed the fifth threshold, then the valve level of the CDC control valve is increased by one level based on the current valve opening level, and if the current valve level of the CDC control valve is the highest level, it remains unchanged; if the second temperature exceeds the fifth threshold but does not exceed the sixth threshold, then the valve level of the CDC control valve is increased by two levels based on the current valve opening level, and if the current valve level of the CDC control valve is the highest level, it remains unchanged; if the second temperature exceeds the sixth threshold, then the valve opening level of the CDC control valve is adjusted to the highest level; wherein the fourth threshold is less than the fifth threshold and less than the sixth threshold.

4. An active temperature regulation and control system for a CDC vibration damper, characterized in that: The control system operates according to any one of the active temperature regulation control methods for CDC vibration dampers as described in claims 1 to 3, including: Temperature acquisition module, the temperature acquisition module is used to acquire the first temperature of the oil in the current CDC shock absorber; The first judgment module determines whether the CDC vibration damper needs temperature adjustment based on the first temperature. The first execution module is used to control the valve opening of the CDC control valve of the CDC damper to increase when the first judgment module determines that the temperature of the CDC damper needs to be adjusted. The information acquisition module is used to acquire vehicle operation information in the current sampling period when the first judgment module determines that the temperature of the CDC shock absorber needs to be adjusted. The temperature prediction module is based on the vehicle operating information of the current sampling period and the first temperature prediction module to predict the second temperature of the CDC shock absorber at the end of the current sampling period while keeping the current vehicle operating information unchanged. The second judgment module is used to compare the second temperature and the set temperature to determine whether active temperature adjustment of the CDC damper is required. The second execution module is used to increase the valve opening of the CDC control valve of the CDC damper when the second judgment module determines that active temperature regulation of the CDC damper is required.

5. The active temperature regulation and control system for a CDC vibration damper as described in claim 4, characterized in that: The first judgment module is used to compare the first temperature with the first threshold, and make a judgment that the temperature adjustment of the CDC vibration damper is not required when the first temperature does not exceed the first threshold, and make a judgment that the temperature adjustment of the CDC vibration damper is required when the first temperature exceeds the first threshold.

6. The active temperature regulation and control system for a CDC vibration damper as described in claim 5, characterized in that: The first execution module includes, The first valve opening degree classification module is used to classify the opening degree of the CDC control valve into multiple opening degree levels from small to large. The first passive temperature regulation control module controls the CDC control valve to increase its opening level by one level based on the current valve opening level when the first temperature exceeds the first threshold but does not exceed the second threshold, and keeps it unchanged when the current valve opening level of the CDC control valve is the highest level. The second passive temperature regulation control module controls the CDC control valve to increase its opening level by two levels based on the current valve opening level when the first temperature exceeds the second threshold but does not exceed the third threshold, and keeps it unchanged when the current valve opening level of the CDC control valve is the highest level. The third passive temperature regulation control module controls the valve opening level of the CDC control valve to the highest level when the first temperature exceeds the third threshold. The first threshold is less than the second threshold, which is less than the third threshold.

7. The active temperature regulation and control system for a CDC vibration damper as described in claim 5, characterized in that: The temperature prediction module is used to calculate the second temperature according to the following formula. Where: T2—second temperature; T1 — First temperature; T0—The heat dissipation temperature of the CDC vibration damper during a single sampling period under the current environment; a—wheel-side acceleration; h — wheel edge height; m—unsprung mass of the vehicle; μ0 — Opening coefficient, which is related to the valve opening of the CDC control valve of the CDC damper; μ1 — the first coefficient, which is related to the wheel-side acceleration; μ2 — ​​the second coefficient, which is related to the wheel edge height; μ3 – The third coefficient, which is related to the unsprung mass of the vehicle.

8. The active temperature regulation and control system for a CDC vibration damper as described in claim 5, characterized in that: The second execution module includes, The second valve opening level classification module is used to classify the opening of the CDC control valve into multiple opening levels from small to large. The first active temperature regulation control module controls the CDC control valve to increase its opening level by one level based on the current valve opening level when the second temperature exceeds the fourth threshold but does not exceed the fifth threshold, and keeps it unchanged when the current valve opening level of the CDC control valve is the highest level. The second active temperature regulation control module controls the CDC control valve to increase its opening level by two levels based on the current valve opening level when the second temperature exceeds the fifth threshold but does not exceed the sixth threshold, and keeps it unchanged when the current valve opening level of the CDC control valve is the highest level. The third active temperature regulation control module controls the valve opening level of the CDC control valve to the highest level when the second temperature exceeds the sixth threshold. The fourth threshold is less than the fifth threshold and less than the sixth threshold.

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