Active temperature regulation control method and system for CDC shock absorber

Abstract

The invention relates to the technical field of automobile control, in particular to an active temperature regulation control method and system for a CDC shock absorber. Comprising the steps that the first temperature of oil in the current CDC shock absorber is collected, and whether temperature adjustment needs to be conducted on the CDC shock absorber or not is judged based on the first temperature; when the temperature of the CDC shock absorber does not need to be adjusted, vehicle operation information of the current sampling period is obtained; based on the vehicle operation information of the current sampling period and the first temperature, estimating a second temperature of the CDC damper after the sampling period is ended under the condition that the current vehicle operation information is kept unchanged; and the second temperature is compared with the set temperature, and when the second temperature exceeds the set temperature, active temperature adjustment is conducted on oil in the CDC shock absorber by increasing the opening degree of a CDC control valve of the CDC shock absorber. Through control over the CDC shock absorber, the temperature of oil in the CDC shock absorber can be estimated, and the CDC shock absorber can be kept in a good working state all the time.

Description

Technical Field

[0001] The invention relates to the technical field of automobile control, and in particular to a CDC shock absorber active temperature regulation control method and control system. Background Art

[0002] Automobile shock absorbers are an important part of the automobile suspension system. Their main function is to cushion the impact of the ground on the vehicle and improve the comfort and handling of the vehicle. Among them, the continuous damping control shock absorber (CDC shock absorber) is a new type of shock absorber that can adjust the damping force in real time according to changes in road conditions and driving conditions, thereby improving the comfort and handling of the vehicle. The CDC system is controlled by a CDC shock absorber assembly arranged on four wheels and a separate electronic control unit. The system will monitor the current driving status of the vehicle in real time (at least 100 times per second) through sensors on the vehicle (body acceleration, lateral acceleration and other sensors). The collected data is transmitted to the control unit for calculation and comparison, and then the corresponding instructions are issued to the CDC control valve to adjust the current output value, thereby controlling the valve opening size to provide damping adapted to the current road conditions.

[0003] When the piston of the CDC shock absorber reciprocates in the cylinder, the oil in the shock absorber housing repeatedly flows from one inner cavity to another through the pores of the CDC control valve. At this time, the friction between the hole wall and the oil and the friction within the liquid molecules form a damping force on the vibration, which converts the vibration energy of the body and frame into heat energy, which is absorbed by the oil and the shock absorber housing and then dissipated into the atmosphere. However, the shock absorbers commonly used in automobiles now face the problem of insufficient heat dissipation capacity. Insufficient heat dissipation capacity of the shock absorber will cause the oil temperature in the shock absorber to be too high, which will reduce the viscosity of the oil, deteriorate the damping effect, and greatly reduce the vibration reduction effect; in severe cases, the oil seal and wiring harness will be burned, and the shock absorber will leak oil, causing the shock absorber to fail to work, seriously affecting the comfort and driving smoothness of the car.

[0004] Currently, the heat dissipation method for CDC shock absorbers is passive heat dissipation, that is, by collecting the temperature of the CDC shock absorber, after the temperature of the CDC shock absorber exceeds a set value, heat dissipation is started. For example, a prior art entitled "An integrated water cooling and heat dissipation system for automobile cylinder shock absorbers" proposes a water cooling and heat dissipation structure for shock absorbers, which includes: an acceleration sensor, a temperature sensor, an electronic control unit, a water pump, and an auxiliary device; the acceleration sensor is installed on the piston rod of the cylinder shock absorber, and is used to detect the movement acceleration of the shock absorber, and feed back the result to the automobile electronic control unit to obtain the heat generating power of the oil in the shock absorber; the temperature sensor is arranged on the outer wall of the oil storage cylinder on the automobile cylinder shock absorber body, and is used to obtain the temperature of the oil in the automobile shock absorber, and feed back the result to the electronic control unit; the control part of the water pump is connected to the automobile electronic control unit and controls the cooling water flow according to different acceleration signals and temperature signals; the auxiliary device includes a cooling water tank, an annular cooling water pipe and a condenser connected in sequence, wherein the annular cooling water pipe is spirally wrapped around the outer wall of the oil storage cylinder of the automobile shock absorber, and the cooling water flows through the annular cooling water pipe to cool the oil in the shock absorber and then flows back to the cooling water tank through the condenser.

[0005] That is, in order to cool down the shock absorber, this structure constructs a water cooling system, and uses the water cooling system to cool down the outer wall of the shock absorber's oil storage cylinder, which can indeed achieve a good cooling effect and avoid the problem of the oil temperature rising in the shock absorber destroying its vibration reduction effect. However, this structure is relatively complex, and a cooling water system needs to be specially configured for the shock absorber, including a cooling water tank, annular cooling water pipe and condenser. This system occupies a large space and is difficult to arrange for the already compact space in the car. In addition, there are certain problems with the control method of this method, and it cannot solve the problem of the heat dissipation effect of the shock absorber oil temperature rise. Summary of the invention

[0006] The purpose of this application is to solve the deficiencies of the above-mentioned background technology and to provide a CDC shock absorber active temperature regulation control method and control system.

[0007] The technical solution of the present application is: a CDC shock absorber active temperature regulation control method, comprising:

[0008] collecting a first temperature of the oil in the current CDC shock absorber, and judging whether the CDC shock absorber needs to be temperature-regulated based on the first temperature;

[0009] When the temperature of the CDC shock absorber does not need to be adjusted, the vehicle operation information of the current sampling period is obtained;

[0010] Based on the vehicle operation information of the current sampling period and the first temperature, estimating the second temperature of the CDC shock absorber after the end of the current sampling period while maintaining the current vehicle operation information unchanged;

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

[0012] According to a CDC shock absorber active temperature adjustment control method provided in the present application, the method for judging whether the CDC shock absorber needs to be temperature adjusted based on a first temperature includes: comparing the first temperature with a first threshold value, and if the first temperature does not exceed the first threshold value, judging that the CDC shock absorber does not need to be temperature adjusted at present; if the first temperature exceeds the first threshold value, judging that the CDC shock absorber needs to be temperature adjusted at present.

[0013] According to a CDC shock absorber active temperature adjustment control method provided by the present application, the method for adjusting the temperature of the CDC shock absorber includes: dividing the valve opening of the CDC control valve into multiple opening levels from small to large; if the first temperature exceeds the first threshold value and does not exceed the second threshold value, the valve level of the CDC control valve is increased by one level on the basis of the current valve opening level of the CDC control valve, 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 value and does not exceed the third threshold value, the valve level of the CDC control valve is increased by two levels on the basis of the current valve opening level of the CDC control valve, 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 value, the valve opening level of the CDC control valve is adjusted to the highest level;

[0014] The first threshold is smaller than the second threshold and smaller than the third threshold.

[0015] According to a CDC shock absorber active temperature adjustment control method provided in the present application, the method for obtaining vehicle operation information in the current sampling period includes: obtaining the wheel acceleration signal, wheel height sensor signal and vehicle unsprung mass signal of the current sampling period.

[0016] According to a CDC shock absorber active temperature adjustment control method provided by the present 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 value of the CDC shock absorber in 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 shock absorber;

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

[0026] μ2——the second coefficient, related to the wheel rim height;

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

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

[0029] The present application also provides a CDC shock absorber active temperature adjustment control system, wherein the control system is operated according to any one of the above-mentioned CDC shock absorber active temperature adjustment control methods, including:

[0030] A temperature acquisition module, wherein the temperature acquisition module is used to obtain a first temperature of the oil in the current CDC shock absorber;

[0031] a first judgment module, which judges whether the CDC shock absorber needs to be temperature-regulated based on the first temperature;

[0032] A first execution module, the first execution module is used to control the CDC control valve of the CDC shock absorber to increase the valve opening when the first judgment module determines that the CDC shock absorber needs to be temperature-regulated;

[0033] An information acquisition module, the information acquisition module is used to acquire vehicle operation information of the current sampling period when the first judgment module determines that the CDC shock absorber needs to be temperature-regulated;

[0034] A temperature estimation module, wherein the temperature estimation module estimates a second temperature of the CDC shock absorber after the end of the current sampling period while maintaining the current vehicle operation information unchanged based on the vehicle operation information of the current sampling period and the first temperature;

[0035] a second determination module, the second determination module being used to compare the second temperature with the set temperature to determine whether active temperature regulation of the CDC shock absorber is required;

[0036] The second execution module is used for controlling the valve opening of the CDC control valve of the CDC shock absorber to increase when the second judgment module determines that the CDC shock absorber needs to be actively temperature-regulated.

[0037] According to a CDC shock absorber active temperature adjustment control system provided by the present application, the first judgment module is used to compare the first temperature with the first threshold value, and make a judgment that the CDC shock absorber does not need to be temperature adjusted at present when the first temperature does not exceed the first threshold value, and make a judgment that the CDC shock absorber needs to be temperature adjusted at present when the first temperature exceeds the first threshold value.

[0038] According to a CDC shock absorber active temperature adjustment control system provided by the present application, the first execution module includes:

[0039] A first valve opening level classification module, wherein the first valve opening level classification module is used to classify the opening of the CDC control valve into a plurality of opening levels from small to large;

[0040] a first passive temperature adjustment control module, wherein when the first temperature exceeds a first threshold value and does not exceed a second threshold value, the first passive temperature adjustment control module controls the CDC control valve to increase a level based on a current valve opening level, and maintains the valve level of the current CDC control valve unchanged when the valve level is the highest level;

[0041] a second passive temperature adjustment control module, wherein when the first temperature exceeds the second threshold value and does not exceed the third threshold value, the second passive temperature adjustment control module controls the CDC control valve to increase the valve opening level by two levels based on the current valve opening level, and maintains the valve opening level of the current CDC control valve unchanged when the valve level of the current CDC control valve is the highest level;

[0042] a third passive temperature adjustment control module, wherein when the first temperature exceeds a third threshold, the third passive temperature adjustment control module controls the valve opening level of the CDC control valve to be the highest level;

[0043] The first threshold is smaller than the second threshold and smaller than the third threshold.

[0044] According to a CDC shock absorber active temperature adjustment control system provided by the present application, the information acquisition module is used to obtain the wheel side acceleration signal, wheel side height sensor signal and vehicle unsprung mass signal of the current sampling period when the first judgment module determines that the CDC shock absorber currently needs to be temperature adjusted.

[0045] According to a CDC shock absorber active temperature adjustment control system provided by the present application, the temperature estimation module is used to calculate the 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 value of the CDC shock absorber in 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 shock absorber;

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

[0055] μ2——the second coefficient, related to the wheel rim height;

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

[0057] According to a CDC shock absorber active temperature adjustment control system provided by the present application, the second execution module includes:

[0058] A second valve opening level classification module, wherein the second valve opening level classification module is used to classify the opening of the CDC control valve into a plurality of opening levels from small to large;

[0059] a first active temperature adjustment control module, wherein when the second temperature exceeds a fourth threshold value and does not exceed a fifth threshold value, the first active temperature adjustment control module controls the CDC control valve to increase a level based on a current valve opening level, and maintains the valve level of the current CDC control valve unchanged when the valve level is the highest level;

[0060] a second active temperature adjustment control module, wherein when the second temperature exceeds a fifth threshold value and does not exceed a sixth threshold value, the second active temperature adjustment control module controls the CDC control valve to increase the valve opening level by two levels based on the current valve opening level, and maintains the valve opening level of the current CDC control valve unchanged when the valve level of the current CDC control valve is the highest level;

[0061] a third active temperature adjustment control module, wherein when the second temperature exceeds a sixth threshold, the third active temperature adjustment control module controls the valve opening level of the CDC control valve to be the highest level;

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

[0063] The advantages of the present application are as follows: 1. The present application can estimate the temperature of the oil in the CDC shock absorber by collecting vehicle operation information, and make an advance judgment on the CDC shock absorber. When it is estimated that the temperature of the oil 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 temperature increase of the oil in the CDC shock absorber is slowed down. The entire control method is estimated in advance, so the temperature of the oil 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, the present application does not need to configure a dedicated water cooling device. 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, no extra space is occupied, and the use cost is also extremely low. The temperature adjustment of the shock absorber can be started before the temperature of the shock absorber rises. The shock absorber will not experience a rapid temperature rise exceeding the normal working temperature limit, and it is always in a good working condition.

[0065] 2. The present application first determines the first temperature of the oil in the CDC shock absorber. If the first temperature exceeds the set temperature, it proves that the oil temperature in the CDC shock absorber is too high and the oil in the CDC shock absorber needs to be temperature-regulated. Then, the valve opening of the CDC control valve can be directly expanded without subsequent judgment, which further simplifies the control process of the entire CDC shock absorber and improves the control efficiency of the CDC shock absorber.

[0066] 3. The present application proposes an operating method for passive control when the actual temperature of the oil in the CDC shock absorber is too high. The present application grades the valve opening of the CDC control valve and adopts different valve opening increase degrees for the space where the first temperature is located, so as to achieve a level that neither significantly attenuates the vibration reduction effect of the CDC shock absorber nor slows down the decrease in the oil temperature, thereby achieving a balance between maintaining the vibration reduction effect of the CDC shock absorber and lowering the oil temperature;

[0067] 4. The method of collecting vehicle operation information in this application is very simple. The heating power of the CDC shock absorber can be easily obtained through the wheel acceleration signal, wheel height sensor signal and vehicle unsprung mass signal. The above information is directly related to the factors of 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 the present application is very simple. The corresponding coefficients of the wheel acceleration signal, wheel height sensor signal and vehicle 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 the temperature rise of the oil in the CDC shock absorber can be accurately estimated.

[0069] 6. The present application proposes an operating method for active control when the estimated temperature of the oil in the CDC shock absorber is too high. The present application divides the valve opening of the CDC control valve into grades and adopts different valve opening increase degrees for the space where the second temperature is located, so as to achieve a level that neither significantly attenuates the vibration reduction effect of the CDC shock absorber nor slows down the decrease in the oil temperature, thereby achieving a balance between maintaining the vibration reduction effect of the CDC shock absorber and lowering the oil temperature;

[0070] 7. The present application also relates to a control system. The control system of the present application can be integrated into the control system of the vehicle and operated according to the above-mentioned control method. This can effectively ensure that the CDC shock absorber always has a good vibration reduction effect and maintain the temperature of the oil in the CDC shock absorber within a good temperature range.

[0071] The control of the CDC shock absorber in the present application can estimate the oil temperature in the CDC shock absorber. By judging based on the estimated temperature, the temperature adjustment of the shock absorber can be started before the shock absorber temperature rises. The shock absorber will not experience a rapid temperature rise exceeding the normal operating temperature limit and will always be in good working condition. BRIEF DESCRIPTION OF THE DRAWINGS

[0072] Figure 1 : Schematic diagram of the CDC shock absorber control process of this application. DETAILED DESCRIPTION

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

[0074] In the description of the present application, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0075] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0076] The present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0077] The present application relates to a CDC shock absorber active temperature regulation control method, which can actively perform temperature regulation operation on the CDC shock absorber, by estimating the temperature of the oil in the CDC shock absorber, and then judging whether the CDC shock absorber needs to be actively temperature regulated based on the estimated temperature. When the CDC shock absorber needs to be actively temperature regulated, the CDC control valve opening of the CDC shock absorber is expanded, the damping is reduced, the oil flow speed is slowed down, and the rate and amplitude of temperature rise are reduced, so as to achieve the purpose of actively and in advance controlling and regulating the temperature, and avoid the oil in the CDC shock absorber from rapidly rising to exceed the amplitude of the set working temperature, which puts the CDC shock absorber in an unfavorable working state. This control method of the present application can always maintain the CDC shock absorber in a suitable temperature environment.

[0078] Specifically, Figure 1 As shown, a CDC shock absorber active temperature adjustment control method of the present application can be performed according to the following steps:

[0079] S1, collecting a first temperature of the oil in the current CDC shock absorber, and judging whether the CDC shock absorber needs to be temperature-regulated based on the first temperature;

[0080] A temperature sensor is installed in the CDC shock absorber, which can collect the temperature of the oil in the CDC shock absorber in real time, that is, the first temperature mentioned above. The purpose of obtaining the first temperature is to determine whether it is necessary to directly adjust the temperature of the CDC shock absorber. If the first temperature exceeds the set temperature, it proves that the oil temperature in the CDC shock absorber is too high at this time, and the CDC shock absorber needs to be directly temperature-regulated, and no subsequent operations are required. If the first temperature does not exceed the set temperature, it proves that the current oil temperature in the CDC shock absorber is in a suitable temperature environment, and the CDC shock absorber does not need to be temperature-regulated;

[0081] S2. When the temperature of the CDC shock absorber does not need to be adjusted, the vehicle operation information of the current sampling period is obtained;

[0082] Only when it is determined in step S1 that the CDC shock absorber does not need to be temperature regulated, the subsequent steps will be performed. The determination in step S1 that the CDC shock absorber does not need to be temperature regulated only indicates that the current CDC shock absorber is in a suitable temperature environment, and does not mean that the temperature of the subsequent CDC shock absorber will not rise and the CDC shock absorber does not need to be temperature regulated.

[0083] The present application is to perform periodic sampling control, by collecting and acquiring vehicle operation information in a certain sampling period, the collected vehicle operation information is information about the work done on the CDC shock absorber, that is, the vehicle operation information about the work done on the CDC shock absorber is collected, and the temperature rise of the CDC shock absorber can be estimated based on these sampling information. The more work is done on the CDC shock absorber, the greater the temperature rise of the oil in the CDC shock absorber, and vice versa, the smaller the temperature rise of the oil in the CDC shock absorber;

[0084] S3, estimating the second temperature of the CDC shock absorber after the end of the current sampling period while maintaining the current vehicle operation information unchanged based on the vehicle operation information of the current sampling period and the first temperature;

[0085] After collecting the vehicle operation information of this sampling cycle, the second temperature after the end of this sampling cycle can be calculated in combination with the current first temperature. The second temperature is an estimated temperature, which is the CDC shock absorber temperature after the end of this sampling cycle while maintaining the current vehicle operation information unchanged. This is an assumption.

[0086] S4, comparing the second temperature with the set temperature, and actively adjusting the temperature of the oil in the CDC shock absorber by increasing the opening of the CDC control valve of the CDC shock absorber when the second temperature exceeds the set temperature;

[0087] By comparing the estimated second temperature with the set temperature, it is determined whether the CDC shock absorber needs to be actively cooled. If the second temperature exceeds the set temperature, it means that if the CDC shock absorber is not adjusted, the temperature of the CDC shock absorber will exceed the set temperature after the current sampling cycle ends. In this case, the CDC shock absorber may be in a poor working state after the current sampling cycle ends. To avoid this, it is necessary to actively adjust the temperature of the CDC shock absorber. If the second temperature does not exceed the set temperature, the valve opening of the CDC control valve can be left unchanged, or the valve opening of the CDC control valve can be reduced.

[0088] The temperature regulation of the present application is achieved by changing the valve opening of the CDC control valve of the CDC shock absorber. When the valve opening increases, the oil damping decreases, and the amplitude and speed of the oil temperature increase in the CDC shock absorber will be greatly slowed down. In fact, the purpose of temperature regulation of the CDC shock absorber is achieved by sacrificing part of the vibration reduction performance of the CDC shock absorber.

[0089] In some embodiments of the present application, this embodiment optimizes the above-mentioned step S1. Specifically, the method for determining whether the CDC shock absorber needs to be temperature-regulated based on the first temperature includes: comparing the first temperature with a first threshold value. If the first temperature does not exceed the first threshold value, it is determined that the CDC shock absorber does not need to be temperature-regulated at present; if the first temperature exceeds the first threshold value, it is determined that the CDC shock absorber needs to be temperature-regulated at present.

[0090] By judging the first temperature, the current working state of the CDC shock absorber can be obtained, and it can be judged whether the CDC shock absorber is in a suitable temperature range under the current situation. If the first temperature of the CDC shock absorber exceeds the first threshold value, it proves that the oil temperature in the CDC shock absorber is too high at this time, and the valve opening of the CDC control valve needs to be increased. By sacrificing part of the CDC shock absorber's damping system, the purpose of delaying the oil temperature rise rate and reducing the oil temperature rise range is achieved.

[0091] The first threshold can be set to 30°C. When the CDC shock absorber works normally, its internal oil temperature range is 0°C to 32°C. The first threshold does not exceed the limit value of the CDC shock absorber when it works normally. When the first temperature is close to the first threshold, it proves that the oil temperature in the CDC shock absorber is about to reach the limit value during normal work. The CDC shock absorber needs to be temperature adjusted in advance, otherwise the oil temperature will quickly exceed the limit value, making the CDC shock absorber in a bad working state. The above values ​​can be selected according to actual needs and are not limited to the above values, as long as they meet the actual needs.

[0092] Specifically, the method for temperature regulating the CDC shock absorber is: according to the valve opening of the CDC control valve, it 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 forms as long as it meets the actual needs.

[0093] When the first temperature of the CDC shock absorber exceeds the first threshold, the temperature of the oil in the CDC shock absorber is too high, and the CDC shock absorber needs to be temperature-regulated in time. The regulation at this time is a passive regulation when the oil temperature is already too high, and a suitable temperature regulation method needs to be selected according to the current first temperature.

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

[0095] That is, different adjustment means are selected for different temperature ranges where the first temperature is located. If the first temperature exceeds the first threshold by a small amount, in order to balance the vibration reduction performance and temperature regulation effect of the CDC shock absorber, it is only necessary to increase the existing valve opening level by one level and slightly increase the valve opening to achieve the effect of delaying the temperature rise and reducing the temperature rise amplitude; if the first temperature exceeds the first threshold by a lot, it is necessary to expand the valve opening to a greater extent to quickly reduce the rise amplitude and speed of the oil temperature in the CDC shock absorber. According to this principle, the control method for passive temperature regulation of the CDC shock absorber of this application is constructed.

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

[0097] In this embodiment, the first threshold is 30° C., the second threshold is 35° C., and the third threshold is 40° C. The above values ​​can be selected according to actual needs and are not limited to the above values, as long as they meet actual needs.

[0098] The temperature rise mentioned in the above embodiment refers to the temperature rise of the oil in the CDC shock absorber caused by the work done on the CDC shock absorber during the operation of the CDC shock absorber, which eliminates the heat dissipation effect of the CDC shock absorber itself. In actual application, the temperature change of the oil in the CDC shock absorber is a synergistic effect of the work done by the CDC shock absorber and the heat dissipation of the CDC shock absorber. The CDC shock absorber will cause the internal oil to heat up, and the heat dissipation of the CDC shock absorber will cause the internal oil temperature to decrease. In this embodiment, the change in the temperature rise of the oil caused by the work done by the CDC shock absorber is changed by controlling the valve opening. When the valve opening of the CDC control valve of the CDC shock absorber increases and the damping decreases, the speed and amplitude of the temperature rise under the same work per unit time will decrease, while the heat dissipation effect of the CDC shock absorber remains unchanged (the external environment remains unchanged, the structure of the CDC shock absorber remains unchanged, so the heat dissipation effect of the CDC shock absorber per unit time remains unchanged), on the one hand it is reduced, and on the other hand it is unchanged, so from the overall situation, the temperature rise amplitude and speed of the oil in the CDC shock absorber will be reduced (compared to the situation where the valve opening is not adjusted).

[0099] In some other embodiments of the present application, this embodiment optimizes the above-mentioned step S2. When it is determined that the CDC shock absorber does not need to be temperature-regulated at present, it proves that the temperature of the oil in the CDC shock absorber is within a suitable temperature range at this time, but it does not mean that the temperature of the CDC shock absorber will still be within a suitable range at some point in the future. In order to maintain the CDC shock absorber within a suitable temperature range at all times, it is necessary to estimate the second temperature of the CDC shock absorber.

[0100] The factors that affect the work done on the CDC shock absorber mainly involve three aspects: the wheel acceleration signal, wheel height sensor signal and vehicle unsprung mass signal of the current sampling period. The wheel acceleration can be collected by the acceleration sensor, the wheel height can be collected by the wheel height sensor, and the vehicle unsprung mass can be collected by the weight sensor. The greater the wheel acceleration, the greater the work done on the CDC shock absorber, and the two are positively correlated; similarly, the wheel height and the vehicle unsprung mass are also positively correlated with the work done on the CDC shock absorber. By collecting the above three signal data at the beginning of the current sampling period, the work power done on the CDC shock absorber in this sampling period under the current operating conditions can be calculated. By obtaining the work power done on the CDC shock absorber in this sampling period, the value of the oil temperature increase caused by the work done on the CDC shock absorber in this sampling period can be calculated. Then, combined with the current oil temperature and the heat dissipation temperature of the CDC shock absorber, the temperature of the oil in the CDC shock absorber at the end of this sampling period can be estimated, that is, the second temperature.

[0101] The specific method for estimating the second temperature is: calculate the second temperature according to the following formula:

[0102] T2=T1+μ0(μ1a+μ2h+μ3m)-T0

[0103] Where: T2——second temperature;

[0104] T1——the first temperature, collected by the temperature sensor in the CDC shock absorber;

[0105] T0——The heat dissipation temperature value of the CDC shock absorber in a single sampling cycle in the current environment is related to the heat dissipation mode of the CDC shock absorber. For example, if the CDC shock absorber adopts the air-cooling heat dissipation mode, then this value is related to the external structure of the CDC shock absorber and the wind speed of the current environment. By determining the heat exchange area between the CDC shock absorber and the external environment and the wind speed of the current environment, the temperature change value in a single sampling cycle can be obtained. This value can be obtained through calibration and stored in the control system, and can be called accordingly in actual application;

[0106] a——wheel side acceleration, acquired based on the acceleration sensor;

[0107] h——wheel side height, collected based on height sensor;

[0108] m—the unsprung mass of the vehicle, which is collected based on the weight sensor;

[0109] μ0——Opening coefficient, which is related to the opening of the CDC control valve of the CDC shock absorber. The larger the opening 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 acceleration. The larger the wheel acceleration, the larger the first coefficient, and vice versa. It is obtained by calibration;

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

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

[0113] The second temperature at the end of this sampling period can be calculated in the above manner. The second temperature is an estimated temperature, which represents the temperature at the end of this sampling period while maintaining the current vehicle operation information.

[0114] By comparing and analyzing the second temperature, it can be determined whether the CDC shock absorber needs to be actively temperature-regulated. Specifically, the method for actively temperature-regulating the oil in the CDC shock absorber 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, they are 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 forms as long as it meets the actual needs.

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

[0116] The fourth threshold, the fifth threshold and the sixth threshold may be the same as the first threshold, the second threshold and the third threshold, such as the fourth threshold is 30° C., the fifth threshold is 35° C., and the sixth threshold is 40° C. They may also be different and can be set according to application requirements.

[0117] When actually controlling: Figure 1 As shown, the first temperature of the oil in the current CDC shock absorber is collected. If the first temperature exceeds the first threshold, it is determined that the CDC shock absorber needs to be temperature-regulated at present. 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 of the CDC control valve. 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 of the CDC control valve. 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 the CDC shock absorber does not need to be temperature adjusted at present, and the wheel side acceleration signal, wheel side height sensor signal and vehicle unsprung mass signal of the current sampling period are obtained, 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 value of the CDC shock absorber in 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 shock absorber;

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

[0128] μ2——the second coefficient, related to the wheel rim 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 value but does not exceed the fifth threshold value, the valve level of the CDC control valve is increased by one level based on the current valve opening level of the CDC control valve, 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 value but does not exceed the sixth threshold value, the valve level of the CDC control valve is increased by two levels based on the current valve opening level of the CDC control valve, 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 value, the valve opening level of the CDC control valve is adjusted to the highest level.

[0131] In addition, the present application also relates to a CDC shock absorber active temperature adjustment control system, comprising 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, wherein the temperature acquisition module is used to acquire a first temperature of the oil in the current CDC shock absorber; the first judgment module determines whether the CDC shock absorber needs to be temperature adjusted based on the first temperature; the first execution module is used to control the CDC control valve of the CDC shock absorber to increase the valve opening when the first judgment module determines that the CDC shock absorber needs to be temperature adjusted; the information acquisition module is used to acquire vehicle operation information of the current sampling period when the first judgment module determines that the CDC shock absorber needs to be temperature adjusted; the temperature estimation module estimates the second temperature of the CDC shock absorber after the end of this round of sampling period while maintaining the current vehicle operation information unchanged based on the vehicle operation information of the current sampling period and the first temperature; the second judgment module is used to compare the second temperature with the set temperature to determine whether the CDC shock absorber needs to be actively temperature adjusted; the second execution module is used to control the CDC control valve of the CDC shock absorber to increase the valve opening when the second judgment module determines that the CDC shock absorber needs to be actively temperature adjusted.

[0132] The first judgment module is used to compare the first temperature with the first threshold, and make a judgment that the CDC shock absorber does not need to be temperature-regulated when the first temperature does not exceed the first threshold, and make a judgment that the CDC shock absorber needs to be temperature-regulated when the first temperature exceeds the first threshold.

[0133] The first execution module includes a first valve opening level division module, a first passive temperature adjustment control module, a second passive temperature adjustment control module and a third passive temperature adjustment control module. The first valve opening level division 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 the first threshold value but does not exceed the second threshold value, the first passive temperature adjustment control module controls the CDC control valve to increase one level on the basis of the current valve opening level, and maintains it unchanged when the valve level of the current CDC control valve is the highest level; when the first temperature exceeds the second threshold value but does not exceed the third threshold value, the second passive temperature adjustment control module controls the CDC control valve to increase two levels on the basis of the current valve opening level, and maintains it unchanged when the valve level of the current CDC control valve is the highest level; when the first temperature exceeds the third threshold value, the third passive temperature adjustment control module controls the valve opening level of the CDC control valve to be the highest level; the first threshold value is less than the second threshold value and less than the third threshold value.

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

[0135] The temperature estimation 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 value of the CDC shock absorber in 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 shock absorber;

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

[0145] μ2——the second coefficient, related to the wheel rim height;

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

[0147] The second execution module includes a second valve opening level division module, a first active temperature adjustment control module, a second active temperature adjustment control module and a third active temperature adjustment control module. The second valve opening level division module is used to divide the opening of the CDC control valve into multiple opening levels from small to large; when the second temperature exceeds the fourth threshold value but does not exceed the fifth threshold value, the first active temperature adjustment control module controls the CDC control valve to increase one level on the basis of the current valve opening level, and maintains it unchanged when the valve level of the current CDC control valve is the highest level; when the second temperature exceeds the fifth threshold value but does not exceed the sixth threshold value, the second active temperature adjustment control module controls the CDC control valve to increase two levels on the basis of the current valve opening level, and maintains it unchanged when the valve level of the current CDC control valve is the highest level; when the second temperature exceeds the sixth threshold value, the third active temperature adjustment control module controls the valve opening level of the CDC control valve to be the highest level; the fourth threshold value is less than the fifth threshold value and less than the sixth threshold value.

[0148] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application to be protected. The scope of protection claimed in the present application is defined by the attached claims and their equivalents.

Claims

1. A CDC shock absorber active temperature regulation control method, characterized in that: include, collecting a first temperature of the oil in the current CDC shock absorber, and judging whether the CDC shock absorber needs to be temperature-regulated based on the first temperature; When the temperature of the CDC shock absorber does not need to be adjusted, the vehicle operation information of the current sampling period is obtained; Based on the vehicle operation information of the current sampling period and the first temperature, estimating the second temperature of the CDC shock absorber after the end of the current sampling period while maintaining the current vehicle operation information unchanged; The second temperature is compared with the set temperature, and when the second temperature exceeds the set temperature, the temperature of the oil in the CDC shock absorber is actively adjusted by increasing the opening of the CDC control valve of the CDC shock absorber.

2. A CDC shock absorber active temperature regulation control method as claimed in claim 1, characterized in that: The method for determining whether the CDC shock absorber needs to be temperature-regulated based on the first temperature includes: comparing the first temperature with a first threshold value, and if the first temperature does not exceed the first threshold value, determining that the CDC shock absorber does not need to be temperature-regulated at present; if the first temperature exceeds the first threshold value, determining that the CDC shock absorber needs to be temperature-regulated at present.

3. A CDC shock absorber active temperature regulation control method as claimed in claim 2, characterized in that: The method for temperature regulating the CDC shock absorber comprises: dividing the CDC control valve into a plurality of opening levels according to the valve opening from small to large; if the first temperature exceeds the first threshold value and does not exceed the second threshold value, the valve level of the CDC control valve is increased by one level on the basis of the current valve opening level of the CDC control valve, and if the current valve level of the CDC control valve is the highest level, it is maintained unchanged; if the first temperature exceeds the second threshold value and does not exceed the third threshold value, the valve level of the CDC control valve is increased by two levels on the basis of the current valve opening level of the CDC control valve, and if the current valve level of the CDC control valve is the highest level, it is maintained unchanged; if the first temperature exceeds the third threshold value, the valve opening level of the CDC control valve is adjusted to the highest level; The first threshold is smaller than the second threshold and smaller than the third threshold.

4. A CDC shock absorber active temperature regulation control method as claimed in claim 1, characterized in that: The method for estimating the second temperature includes: calculating the second temperature according to the following formula: T2=T1+μ0(μ1a+μ2h+μ3m)-T0 Where: T2——second temperature; T1——first temperature; T0——The heat dissipation temperature value of the CDC shock absorber in 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 shock absorber; μ1——the first coefficient, related to the wheel side acceleration; μ2——the second coefficient, related to the wheel rim height; μ3 – the third coefficient, related to the unsprung mass of the vehicle.

5. The CDC shock absorber active temperature regulation control method according to claim 1, characterized in that: The method for actively regulating the temperature of the oil in the CDC shock absorber includes: dividing the CDC control valve into multiple opening levels from small to large according to the valve opening of the CDC control valve; if the second temperature exceeds the fourth threshold value and does not exceed the fifth threshold value, the valve level of the CDC control valve is increased by one level based on the current valve opening level of the CDC control valve, 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 value and does not exceed the sixth threshold value, the valve level of the CDC control valve is increased by two levels based on the current valve opening level of the CDC control valve, 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 value, the valve opening level of the CDC control valve is adjusted to the highest level; the fourth threshold value is less than the fifth threshold value and less than the sixth threshold value.

6. A CDC shock absorber active temperature adjustment control system, characterized in that: The control system is operated according to any one of the CDC shock absorber active temperature regulation control methods as claimed in claims 1 to 5, including: A temperature acquisition module, wherein the temperature acquisition module is used to obtain a first temperature of the oil in the current CDC shock absorber; a first judgment module, which judges whether the CDC shock absorber needs to be temperature-regulated based on the first temperature; A first execution module, the first execution module is used to control the CDC control valve of the CDC shock absorber to increase the valve opening when the first judgment module determines that the CDC shock absorber needs to be temperature-regulated; An information acquisition module, the information acquisition module is used to acquire vehicle operation information of the current sampling period when the first judgment module determines that the CDC shock absorber needs to be temperature-regulated; A temperature estimation module, wherein the temperature estimation module estimates a second temperature of the CDC shock absorber after the end of the current sampling period while maintaining the current vehicle operation information unchanged based on the vehicle operation information of the current sampling period and the first temperature; a second determination module, the second determination module being used to compare the second temperature with the set temperature to determine whether active temperature regulation of the CDC shock absorber is required; The second execution module is used for controlling the valve opening of the CDC control valve of the CDC shock absorber to increase when the second judgment module determines that the CDC shock absorber needs to be actively temperature-regulated.

7. A CDC shock absorber active temperature adjustment control system as claimed in claim 6, characterized in that: The first judgment module is used to compare the first temperature with the first threshold, and make a judgment that the CDC shock absorber does not need to be temperature-regulated when the first temperature does not exceed the first threshold, and make a judgment that the CDC shock absorber needs to be temperature-regulated when the first temperature exceeds the first threshold.

8. A CDC shock absorber active temperature adjustment control system as claimed in claim 7, characterized in that: The first execution module includes: A first valve opening level classification module, wherein the first valve opening level classification module is used to classify the opening of the CDC control valve into a plurality of opening levels from small to large; a first passive temperature adjustment control module, wherein when the first temperature exceeds a first threshold value and does not exceed a second threshold value, the first passive temperature adjustment control module controls the CDC control valve to increase a level based on a current valve opening level, and maintains the valve level of the current CDC control valve unchanged when the valve level is the highest level; a second passive temperature adjustment control module, wherein when the first temperature exceeds the second threshold value and does not exceed the third threshold value, the second passive temperature adjustment control module controls the CDC control valve to increase the valve opening level by two levels based on the current valve opening level, and maintains the valve opening level of the current CDC control valve unchanged when the valve level of the current CDC control valve is the highest level; a third passive temperature adjustment control module, wherein when the first temperature exceeds a third threshold, the third passive temperature adjustment control module controls the valve opening level of the CDC control valve to be the highest level; The first threshold is smaller than the second threshold and smaller than the third threshold.

9. A CDC shock absorber active temperature adjustment control system as claimed in claim 7, characterized in that: The temperature estimation module is used to calculate the second temperature according to the following formula: T2=T1+μ0(μ1a+μ2h+μ3m)-T0 Where: T2——second temperature; T1——first temperature; T0——The heat dissipation temperature value of the CDC shock absorber in 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 shock absorber; μ1——the first coefficient, related to the wheel side acceleration; μ2——the second coefficient, related to the wheel rim height; μ3 – the third coefficient, related to the unsprung mass of the vehicle.

10. A CDC shock absorber active temperature adjustment control system as claimed in claim 7, characterized in that: The second execution module includes: A second valve opening level classification module, wherein the second valve opening level classification module is used to classify the opening of the CDC control valve into a plurality of opening levels from small to large; a first active temperature adjustment control module, wherein when the second temperature exceeds a fourth threshold value and does not exceed a fifth threshold value, the first active temperature adjustment control module controls the CDC control valve to increase a level based on a current valve opening level, and maintains the valve level of the current CDC control valve unchanged when the valve level is the highest level; a second active temperature adjustment control module, wherein when the second temperature exceeds a fifth threshold value and does not exceed a sixth threshold value, the second active temperature adjustment control module controls the CDC control valve to increase the valve opening level by two levels based on the current valve opening level, and maintains the valve opening level of the current CDC control valve unchanged when the valve level of the current CDC control valve is the highest level; a third active temperature adjustment control module, wherein when the second temperature exceeds a sixth threshold, the third active temperature adjustment control module controls the valve opening level of the CDC control valve to be the highest level; The fourth threshold is smaller than the fifth threshold and smaller than the sixth threshold.

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