CN113435064B - Silicon oil damper service life prediction method and vehicle - Google Patents
Silicon oil damper service life prediction method and vehicle Download PDFInfo
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- CN113435064B CN113435064B CN202110858671.1A CN202110858671A CN113435064B CN 113435064 B CN113435064 B CN 113435064B CN 202110858671 A CN202110858671 A CN 202110858671A CN 113435064 B CN113435064 B CN 113435064B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
- F16F15/16—Suppression of vibrations in rotating systems by making use of members moving with the system using a fluid or pasty material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F2230/00—Purpose; Design features
- F16F2230/0047—Measuring, indicating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F2230/00—Purpose; Design features
- F16F2230/24—Detecting or preventing malfunction, e.g. fail safe
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/04—Ageing analysis or optimisation against ageing
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/08—Thermal analysis or thermal optimisation
Abstract
The invention relates to the technical field of vehicles, and particularly discloses a silicone oil damper service life prediction method and a vehicle, wherein the silicone oil damper service life prediction method comprises the steps of collecting the real-time temperature of a silicone oil damper, the real-time torque of an engine and the real-time rotating speed of the engine in real time in the running process of the vehicle; acquiring a real-time torsional amplitude value of the silicone oil damper according to the real-time rotating speed; converting the real-time torsional amplitude value into a standard torsional amplitude value of the silicone oil damper at a set temperature and a set torque according to the corresponding relation among the temperature, the torque and the torsional amplitude value; and acquiring the first remaining driving mileage of the silicone oil damper according to the corresponding relation between the driving mileage and the cracking amount of the torsional amplitude value. The real-time torsion amplitude value of the silicone oil damper is converted into the standard torsion amplitude value under the set temperature and the set torque, and the residual driving mileage of the silicone oil damper is evaluated through the standard torsion amplitude value, so that the influence of different real-time working conditions on the torsion amplitude value can be avoided, and the accuracy of an evaluation result is ensured.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a method for predicting the service life of a silicone oil damper and a vehicle.
Background
The silicone oil damper is a key part of a vehicle, is arranged on a crankshaft of an engine and is important for keeping the running of the vehicle safe and stable.
In the prior art, when the residual life of the silicone oil damper needs to be predicted, the silicone oil damper is usually required to be installed on a test bed, and after the silicone oil damper is loaded for a certain number of times to be invalid, the maximum loading number of the silicone oil damper is counted. However, when the silicone oil damper is installed on a vehicle, the remaining service life of the silicone oil damper cannot be effectively evaluated, and in the actual use process of the silicone oil damper, the working condition of the silicone oil damper is constantly changed, for example, the performance of the silicone oil damper is affected by the changes of the temperature, the system resonance and other factors, so that the attenuation degree of the remaining service life of the silicone oil damper is changed, and a test bench cannot comprehensively simulate various use conditions of the vehicle, so that the prediction method is inaccurate.
Disclosure of Invention
The invention aims to: the method for predicting the service life of the silicone oil damper and the vehicle are provided, so that the residual travel mileage of the silicone oil damper can be evaluated on the vehicle, and the evaluation result is accurate.
In one aspect, the present invention provides a method for predicting a lifetime of a silicone oil damper, in which the silicone oil damper is installed on a crankshaft of an engine of a vehicle, the method for predicting a lifetime of a silicone oil damper includes:
the method comprises the following steps of collecting the real-time temperature of a silicone oil damper, the real-time torque of an engine and the real-time rotating speed of the engine in real time in the running process of a vehicle;
acquiring a real-time torsional amplitude value of the silicone oil damper according to the real-time rotating speed;
converting the real-time torsional amplitude value into a standard torsional amplitude value of the silicone oil damper at a set temperature and a set torque according to the corresponding relation among the temperature, the torque and the torsional amplitude value;
and acquiring a first remaining driving mileage of the silicone oil damper according to a corresponding relation between the driving mileage and a cracking amount of the torsional amplitude value, wherein the cracking amount of the torsional amplitude value is a difference value between a standard torsional amplitude value at any moment in a service life range of the silicone oil damper and the standard torsional amplitude value when the silicone oil damper is used for the first time.
As a preferred technical solution of the method for predicting the service life of the silicone oil damper, the method for predicting the service life of the silicone oil damper further comprises:
acquiring the viscosity of basic silicone oil of the silicone oil damper;
according to the conversion relation among temperature, frequency and viscosity, converting the viscosity of the basic silicone oil into the viscosity of the standard silicone oil of the silicone oil damper at a set temperature and a set frequency;
acquiring a second remaining driving mileage of the silicone oil damper according to a corresponding relation between the driving mileage and a cracking rate of the silicone oil viscosity, wherein the cracking rate of the silicone oil viscosity is a ratio of the standard silicone oil viscosity at any moment in the service life range of the silicone oil damper to the standard silicone oil viscosity when the silicone oil damper is used for the first time;
and taking the minimum value of the first remaining driving mileage and the second remaining driving mileage as the remaining life of the silicone oil damper.
As a preferred technical scheme of the service life prediction method of the silicone oil damper, the vehicle running distance S a In the process, the viscosity of the corresponding standard silicone oil at the beginning is the first standard silicone oil viscosity eta 1 The viscosity of the corresponding standard silicone oil at the beginning is the viscosity eta of the second standard silicone oil 2 ；
The corresponding relation between the driving mileage and the cracking rate of the viscosity of the silicone oil is as follows:
S η ＝(η failure -η s1 )/V η_rate ；
V η_rate ＝(η s1 -η s0 )/S a ；
or the corresponding relation between the driving mileage and the cracking rate of the viscosity of the silicone oil is as follows:
wherein the content of the first and second substances,
S η and
the residual driving mileage of the silicone oil damper is adopted; eta failure The cracking rate of the viscosity of the silicone oil when the silicone oil damper fails; eta s1 For the distance S traveled by the vehicle a Viscosity cracking rate, eta, of silicone oil just after completion of the process of (1) S0 For the distance S traveled by the vehicle a Viscosity cracking rate of silicone oil, V, at the very beginning of the process of (1) η_rate For the distance S traveled by the vehicle a The change rate of the silicone oil viscosity cracking rate of the silicone oil damper in the process of (2); eta 0 The method is characterized in that the method is a standard silicone oil viscosity under a set temperature and a set torque when a silicone oil damper is used for the first time; eta n The method is characterized in that the method is a standard silicone oil viscosity at a set temperature and a set torque when a preset silicone oil damper fails;
is the average rate of change of the silicone oil viscosity cracking rate of the silicone oil damper in the service life and is constant.
As an optimal technical scheme of the method for predicting the service life of the silicone oil damper, the silicone oil damper comprises a shell and an inertia ring arranged in the shell, and a formula for acquiring the viscosity of basic silicone oil of the silicone oil damper is as follows:
wherein eta is the viscosity of the basic silicone oil; ζ is the damping ratio; c tC Is a critical damping coefficient; nc is the flow index of the silicone oil; r 1 The outer diameter of the inertia ring; r 2 Is the inner diameter of the inertia ring; b is the thickness of the inertia ring; delta. for the preparation of a coating c Is the gap between the shell and the inertia ring; q is the quality factor of silicone oil and is a constant.
As the preferred technical scheme of the method for predicting the service life of the silicone oil damper, the conversion relation among temperature, frequency and viscosity is as follows:
η(t equil ，ω q )＝V(t equil -t,ω q )+η；
wherein, t equil The temperature is set, and t is the real-time temperature; omega q To set the frequency, η (t) equil ，ω q ) The method is characterized in that the method is a standard silicone oil viscosity of a silicone oil damper at a set temperature and a set frequency; v (t) equil -t,ω q ) The correction quantity of the viscosity of the silicone oil relative to the difference value of the real-time temperature and the set temperature is obtained.
As a preferred technical scheme of the method for predicting the service life of the silicone oil damper, judging the size of the residual service life of the silicone oil damper;
when the residual life of the silicone oil damper is less than Z 1 When the vehicle speed is within the set speed range, limiting the torque of the vehicle to be within the set torque range;
when the residual life of the silicone oil damper is greater than or equal to Z 1 And is less than Z 2 Sending out a prompt of needing maintenance;
when the residual life of the silicone oil damper is greater than or equal to Z 3 When the shock absorber is normal, a prompt that the silicone oil shock absorber is normal is sent;
wherein Z is 1 ＜Z 2 ＜Z 3 。
As a preferable technical scheme of the method for predicting the service life of the silicone oil damper,
vehicle running distance S b In the process of (2), the corresponding standard torque amplitude value at the beginning is a first standard torque amplitude value T 1 The corresponding standard torque amplitude value at the end is a second standard torque amplitude value T 2 ；
The corresponding relation between the driving mileage and the cracking amount of the torsional amplitude value is as follows:
S T ＝(T failure -T s1 )/V T_rate ；
V T_rate ＝(T s1 -T s0 )/S b ；
or the corresponding relation between the driving mileage and the cracking amount of the torsional amplitude value is as follows:
wherein, T failure ＝T n -T 0 ，T s1 ＝T 2 -T 0 ，T s0 ＝T 1 -T 0 ；S T And
the remaining driving mileage of the silicone oil shock absorber is obtained; t is a unit of failure The cracking quantity is the torsional amplitude value when the silicone oil damper fails; t is a unit of s1 For the distance S traveled by the vehicle b Amount of cracking, T, of torsional vibration amplitude value immediately after the completion of the process of (1) S0 For the distance S traveled by the vehicle b Amount of cracking, V, of torsional vibration amplitude value at the beginning of the process of (1) T_rate For the distance S traveled by the vehicle b The rate of change of the cracking amount of the torsional vibration amplitude value of the silicone oil damper in the process of (1); t is 0 The method comprises the following steps of (1) setting a standard torsion amplitude value of a preset silicone oil damper at a set temperature and a set torque when the damper is used for the first time; t is n The method comprises the following steps of (1) setting a standard torsion amplitude value of a preset silicone oil damper at a set temperature and a set torque when the preset silicone oil damper fails;
is the average rate of change of the amount of cracking of the torsional vibration amplitude value over the life of the silicone oil damper and is constant.
As a preferred technical scheme of the method for predicting the service life of the silicone oil damper, a crankshaft is provided with a rotating speed signal panel, a rotating speed sensor is used for acquiring the rotating angle of the rotating speed signal panel, and a formula for acquiring the real-time torsional amplitude value of the silicone oil damper according to the real-time rotating speed is as follows:
wherein, t n Is time; theta (t) n ) Is torsional angular displacement; omega p Is the instantaneous angular velocity; t is t c The time for the signal panel to rotate for one circle is taken; n is the total tooth number of the rotating speed signal panel; n is t n The number of teeth of the rotating speed signal panel experienced at the moment;
is the average torsional angular displacement and is constant; k is an integral multiple of 0.5; theta k A real-time torsional amplitude value at the kth harmonic; delta k Is the initial phase of torsional oscillation at the kth harmonic, and is constant.
As an optimal technical scheme of the silicone oil damper service life prediction method, the corresponding relation among the temperature, the torque and the torsional amplitude value is as follows:
T(t equil ，load full )＝U(t equil -t)+L(load full -load)+T(t，load)；
wherein, t equil To set the temperature, load full For set torque, T is the real time temperature, load is the real time torque, T (T) equil ，load full ) The standard torsion amplitude value of the silicone oil damper under the set temperature and the set torque is obtained; u (t) equil -t) correction of the torque amplitude value with respect to the difference between the real time temperature and the set temperature, L (load) full Load) is a correction of the torque amplitude value with respect to the difference between the real-time torque and the set torque; t (T, load) ═ θ k 。
The method is used as a preferred technical scheme of the silicone oil damper service life prediction method, after a real-time torsion amplitude value is obtained, whether the real-time torsion amplitude value is within a first set torsion amplitude value range is judged, when the real-time torsion amplitude value is within or exceeds the first set torsion amplitude value range, the real-time torsion amplitude value is converted into a standard torsion amplitude value of the silicone oil damper under a set temperature and a set torque, and when the real-time torsion amplitude value exceeds the first set torsion amplitude value range, an alarm prompt is sent out.
The method is used as a preferable technical scheme of the silicone oil damper service life prediction method, after a standard torsion amplitude value is obtained, whether the standard torsion amplitude value is within a set standard torsion amplitude value range or not is judged, and if the standard torsion amplitude value is within the set torsion amplitude value range, the first residual travel mileage of the silicone oil damper is obtained.
The method is characterized by also comprising the following steps of in the vehicle running process, before the real-time temperature of the silicone oil damper and the real-time torque of an engine are collected in real time:
and confirming that the triggering condition of the service life of the silicone oil damper is met.
As a preferred technical scheme of the method for predicting the service life of the silicone oil damper, the triggering conditions for confirming the service life of the silicone oil damper comprise the following steps:
acquiring the driving mileage of the vehicle after the service life of the last silicone oil damper is predicted to be finished;
judging and confirming that the driving mileage is within a set mileage range;
acquiring the rotating speed of an engine;
acquiring real-time torque of an engine;
acquiring the temperature of the silicone oil damper;
and judging and confirming that the rotating speed of the engine is within a set rotating speed range, the real-time torque of the engine is within a set torque range, and the temperature of the silicone oil damper is within a set temperature range, and then confirming that the trigger condition of the service life of the silicone oil damper is met.
The present embodiment also provides a vehicle including:
an engine;
the vehicle control unit can acquire real-time torque output by the engine;
a silicone oil damper provided to a crankshaft of the engine;
the temperature sensor is used for collecting the temperature of the silicone oil damper,
the rotating speed signal panel is arranged on a crankshaft of the engine;
the rotating speed sensor is used for acquiring the rotating angle of the rotating speed signal panel;
the controller is connected with the temperature sensor to acquire the real-time temperature of the silicone oil damper; the rotating speed sensor is connected with the engine to acquire the real-time rotating speed of the engine; the controller is used for interacting with the vehicle control unit to obtain the real-time torque, and the controller is used for executing the silicone oil damper service life prediction method in any scheme.
The invention has the beneficial effects that:
the invention provides a method for predicting the service life of a silicone oil damper, which comprises the following steps: the method comprises the following steps of collecting the real-time temperature of a silicone oil damper, the real-time torque of an engine and the real-time rotating speed of the engine in real time in the running process of a vehicle; acquiring a real-time torsional amplitude value of the silicone oil damper according to the real-time rotating speed; converting the real-time torsional amplitude value into a standard torsional amplitude value of the silicone oil damper at a set temperature and a set torque according to the corresponding relation among the temperature, the torque and the torsional amplitude value; and acquiring the first remaining driving mileage of the silicone oil damper according to the corresponding relation between the driving mileage and the cracking amount of the torsional amplitude value. The real-time torsional amplitude value of the silicone oil damper is converted into the standard torsional amplitude value under the set temperature and the set torque, and the residual travel mileage of the silicone oil damper is evaluated through the standard torsional amplitude value, so that the influence of different real-time working conditions on the torsional amplitude value can be avoided, and the accuracy of an evaluation result is ensured.
The invention also provides a vehicle which comprises an engine, a vehicle control unit, a silicone oil damper, a temperature sensor, a rotating speed signal panel, a rotating speed sensor and a controller. The vehicle control unit can acquire real-time torque output by the engine through a torque sensor and the like; the controller is used for interacting with the vehicle control unit to obtain the real-time torque. The silicone oil damper is arranged on a crankshaft of the engine. The temperature sensor is used for acquiring the temperature of the silicone oil damper and sending the temperature to the controller; the rotating speed signal panel is arranged on a crankshaft of the engine and can rotate along with the rotation of the crankshaft, the rotating speed sensor is used for collecting the rotating angle of the rotating speed signal panel and sending the rotating angle to the controller, and the controller is used for executing the silicone oil damper service life prediction method. The vehicle can evaluate the residual service life of the silicone oil damper in the driving process, and the silicone oil damper does not need to be independently tested on a test bed.
Drawings
FIG. 1 is a schematic view of a vehicle according to an embodiment of the present invention;
FIG. 2 is a first flowchart of a method for predicting the service life of a silicone oil damper in an embodiment of the invention;
FIG. 3 is a second flowchart of a method for predicting the service life of a silicone oil damper according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a silicone oil damper according to an embodiment of the present invention;
FIG. 5 is a graph showing the relationship between the viscosity of silicone oil and the correction amount of the difference between the real-time temperature and the set temperature in the example of the present invention;
FIG. 6 is a third flow chart of the method for predicting the service life of the silicone oil damper in the embodiment of the invention.
In the figure:
1. an engine; 2. a vehicle control unit; 3. a silicone oil damper; 31. a housing; 32. an inertia ring; 4. a temperature sensor; 5. a rotating speed signal panel; 6. a rotational speed sensor; 7. a controller; 71. a torsional vibration processor; 72. an engine electronic control unit; 8. a display device.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Where the terms "first position" and "second position" are two different positions, and where a first feature is "over", "above" and "on" a second feature, the first feature is directly over and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
Example one
As shown in fig. 1, the present embodiment provides a vehicle including an engine 1, a vehicle control unit 2, a silicone oil damper 3, a temperature sensor 4, a tachometer signal panel 5, a tachometer sensor 6, and a controller 7. The vehicle control unit 2 can acquire real-time torque output by the engine 1 through a torque sensor and the like; the controller 7 is used for interacting with the vehicle control unit 2 to obtain the real-time torque. The silicone oil damper 3 is provided on a crankshaft of the engine 1. The temperature sensor 4 is used for acquiring the temperature of the silicone oil damper 3 and sending the temperature to the controller 7; speed signal dish 5 sets up in engine 1's bent axle and can rotate along with the rotation of bent axle, speed sensor 6 is used for gathering the angle that speed signal dish 5 rotated and sends controller 7, specifically, speed signal dish 5 has a plurality of teeth, every tooth is when speed sensor 6, all can lead to speed sensor 6 to switch between high level and low level, controller 7 is through the number of times of gathering the switching of 6 levels of speed sensor, and combine the number of teeth of speed signal dish 5 and the time of process to acquire angle and the real-time rotational speed that speed signal dish 5 rotated.
The controller 7 can also obtain a real-time torsional amplitude value of the silicone oil damper 3 according to the real-time rotating speed, and convert the real-time torsional amplitude value into a standard torsional amplitude value of the silicone oil damper 3 at a set temperature and a set torque according to the corresponding relation of the temperature, the torque and the torsional amplitude value; and acquiring the first remaining driving mileage of the silicone oil damper 3 according to the corresponding relation between the driving mileage and the cracking amount of the torsional amplitude value. The cracking quantity of the torsional amplitude value is the difference value between the standard torsional amplitude value at any moment in the service life range of the silicone oil damper 3 and the standard torsional amplitude value when the silicone oil damper 3 is used for the first time, and the cracking quantity of the torsional amplitude value can be used for representing the cracking degree of the torsional amplitude value of the silicone oil damper 3.
The vehicle that this embodiment provided can assess the remaining life-span of silicon oil damper 3 at the driving in-process, need not to test alone at the test bench to through the standard torsional amplitude value of converting the real-time torsional amplitude value of silicon oil damper 3 under the settlement temperature and the settlement moment of torsion, and through this standard torsional amplitude value to assess the remaining mileage of silicon oil damper 3, can avoid the influence of the difference of real-time operating mode to torsional amplitude value, ensure the accuracy of assessment result.
It should be noted that the controller 7 of the present embodiment includes a torsional vibration processor 71 and an engine electronic control unit 72, and the torsional vibration processor 71 obtains a real-time torsional amplitude value of the silicone oil damper 3 according to a real-time rotation speed. The engine electronic control unit 72 and the torsional vibration processor 71 interactively obtain the real-time torsional amplitude value, and according to the corresponding relationship among the temperature, the torque and the torsional amplitude value, the real-time torsional amplitude value is converted into a standard torsional amplitude value of the silicone oil damper 3 at the set temperature and the set torque, and then according to the corresponding relationship between the driving mileage and the cracking amount of the torsional amplitude value, the first remaining driving mileage of the silicone oil damper 3 is obtained.
Optionally, the vehicle further comprises a display device 8, the display device 8 and an engine electronic control unit 72 for displaying the remaining life of the silicone oil damper 3.
Example two
As shown in fig. 2, the present embodiment provides a silicone oil damper life prediction method that can be implemented by the vehicle of the one embodiment, including the following steps.
S100: and in the running process of the vehicle, the real-time temperature of the silicone oil damper 3, the real-time torque of the engine 1 and the real-time rotating speed of the engine 1 are acquired in real time.
Specifically, the controller 7 may acquire the real-time temperature of the silicone oil damper 3 through the temperature sensor 4, acquire the real-time torque of the engine 1 through interaction with the vehicle control unit 2, and acquire the real-time rotation speed of the engine 1 through the rotation speed sensor 6.
S110: and acquiring a real-time torsional amplitude value of the silicone oil damper 3 according to the real-time rotating speed.
Specifically, the formula for obtaining the real-time torsional amplitude value of the silicone oil damper 3 according to the real-time rotating speed is as follows:
wherein the content of the first and second substances,
expansion according to Fourier trigonometric series. In the formula, t n Is time; theta (t) n ) Is torsional angular displacement; omega p The instantaneous angular velocity can be obtained by calculating the real-time rotating speed of the engine 1 and the outer diameter of the silicone oil damper 3 through the existing formula; t is t c The time for the signal panel to rotate for one circle is taken; n is the total number of teeth of the rotating speed signal panel 5; n is t n The number of teeth of the rotation speed signal panel 5 experienced at the moment;
is the average torsional angular displacement and is constant; k is an integral multiple of 0.5; theta k A real-time torsional amplitude value at the kth harmonic; delta k Is the initial phase of torsional oscillation at the k-th harmonic and is constant.
S120: and converting the real-time torsional amplitude value into a standard torsional amplitude value of the silicone oil damper 3 at the set temperature and the set torque according to the corresponding relation among the temperature, the torque and the torsional amplitude value.
The correspondence relationship between the temperature, the torque, and the torsional amplitude value can be obtained through a large number of experiments in the early stage, and the correspondence relationship between the temperature, the torque, and the torsional amplitude value is prestored in the controller 7. The set temperature is preferably an equilibrium temperature and the set torque is preferably a torque at a full load state of the vehicle. It can be understood that the magnitude of the torsional amplitude value of the silicone oil damper 3 is influenced by the temperature and the vehicle load, and the torsional amplitude value of the silicone oil damper 3 gradually changes along with the change of the temperature and the change of the torque in a certain range, but the torsional amplitude value of the silicone oil damper 3 tends to be stable when the temperature reaches the equilibrium temperature and the torque reaches the full load of the vehicle. Of course, the set temperature and the set torque can be set according to actual needs.
It should be noted that, the set temperature and the set torque of the vehicle are different under different working conditions, such as no-load, light-load and heavy-load working conditions, and a large number of early-stage tests can be performed to obtain the set temperature and the set torque of the vehicle under different working conditions, and the corresponding relationship among the temperature, the torque and the torsional amplitude value is respectively made according to the difference of the working conditions. When the vehicle runs, the vehicle controller 2 can judge the working condition of the vehicle, the controller 7 can acquire the corresponding working condition by interacting with the vehicle controller 2, and the real-time torsion amplitude value can be converted into the standard torsion amplitude value according to the corresponding relation of the temperature, the torque and the torsion amplitude value matched with the working condition.
In this embodiment, the corresponding relationship among the temperature, the torque and the torsional amplitude value is as follows:
T(t equil ，load full )＝U(t equil -t)+L(load full -load)+T(t，load)。
wherein, t equil To set the temperature, load full For set torque, T is the real time temperature, load is the real time torque, T (T) equil ，load full ) The standard torsional amplitude value of the silicone oil damper 3 at a set temperature and a set torque is obtained; u (t) equil -t) correction of the torque amplitude value with respect to the difference between the real time temperature and the set temperature, L (load) full Load) is a correction of the torque amplitude value with respect to the difference between the real-time torque and the set torque; t (T, load) ═ θ k . U (t) in the present embodiment equil T) obtaining the relationship graph of the difference value between the real-time temperature and the set temperature and the standard torque amplitude value under the set torque through a large number of previous experiments and pre-storing the relationship graph in the controller 7, and similarly, L (load) full Load), a relationship chart of the difference between the real-time torque and the set torque and the standard torque amplitude value at the set temperature can be obtained through a large number of experiments in the early stage and is prestored in the controller 7, and U (t) can also be set according to requirements equil -t)、L(load full -load) and T (T, load).
S130: and acquiring the first remaining driving mileage of the silicone oil damper 3 according to the corresponding relation between the driving mileage and the cracking amount of the torsional amplitude value.
The cracking amount of the torque amplitude value is a difference between a standard torque amplitude value at any time within the life range of the silicone oil damper 3 and a standard torque amplitude value when the silicone oil damper 3 is used for the first time. The correspondence relationship between the mileage and the cracking amount of the torsional vibration amplitude value can be obtained by a large number of experiments in the early stage, and the correspondence relationship between the mileage and the cracking amount of the torsional vibration amplitude value is prestored in the controller 7. Specifically, in this embodiment, the relationship between the driving mileage and the cracking amount of the torque amplitude value is as follows:
S T ＝(T failure -T s1 )/V T_rate ；
V T_rate ＝(T s1 -T s0 )/S b ；
wherein the vehicle travels a distance S b In the process of (2), the corresponding standard torque amplitude value at the beginning is a first standard torque amplitude value T 1 The standard torque amplitude value corresponding to the end is the second standard torque amplitude value T 2 ；T failure ＝T n -T 0 ，T s1 ＝T 2 -T 0 ，T s0 ＝T 1 -T 0 ；S T The remaining driving mileage of the silicone oil damper 3; t is failure The cracking quantity is the torsional amplitude value when the silicone oil damper 3 fails; t is s1 For the distance S traveled by the vehicle b Amount of cracking, T, of torsional vibration amplitude value immediately after the completion of the process of (1) S0 For the distance S traveled by the vehicle b Amount of cracking, V, of torsional vibration amplitude value at the beginning of the process of (1) T_rate For the distance S traveled by the vehicle b The change rate of the cracking amount of the torsional amplitude value of the silicone oil damper 3 in the process of (1); t is a unit of 0 The method comprises the steps that a preset standard torsion amplitude value of the silicone oil damper 3 under a set temperature and a set torque is obtained when the damper is used for the first time; t is n The standard torsional vibration amplitude value is the standard torsional vibration amplitude value under the set temperature and the set torque when the preset silicone oil damper 3 fails. T is 0 And T n The silicone oil damper 3 can be obtained by testing the silicone oil damper 3 at a preset temperature and a preset torque through a large number of early-stage tests.
In the formula S T ＝(T failure -T s1 )/V T_rate And V T_rate ＝(T s1 -T s0 )/S b In, V T_rate The real-time change of the change rate of the cracking quantity of the torsional amplitude value of the silicone oil damper 3 can be reflected.
As an alternative, the corresponding relationship between the mileage and the cracking amount of the torque amplitude value may be:
wherein the content of the first and second substances,
is the average rate of change of the amount of cracking of the torsional amplitude value over the life of the silicone oil damper 3, which is a constant;
the silicone oil damper 3 can be obtained by testing the silicone oil damper under the preset temperature and the preset torque through a large number of early-stage tests.
The remaining mileage of the silicone oil damper 3, specifically,
average rate of change of cracking amount based on torsional amplitude valueFrom S b The remaining driving range thereafter.
According to the method for predicting the service life of the silicone oil damper, the real-time torsional amplitude value of the silicone oil damper 3 is converted into the standard torsional amplitude value under the set temperature and the set torque, and the residual travel mileage of the silicone oil damper 3 is evaluated through the standard torsional amplitude value, so that the influence of different real-time working conditions on the torsional amplitude value can be avoided, and the accuracy of an evaluation result is ensured.
EXAMPLE III
As shown in fig. 3, in consideration of the parameter capable of representing the service life of the silicone oil damper 3, besides the torsional amplitude value of the silicone oil damper 3, there is a silicone oil viscosity, and the silicone oil viscosity and the torsional amplitude value of the silicone oil damper 3 are not cracked simultaneously, which results in that, when one of the torsional amplitude value and the silicone oil viscosity can satisfy the use requirement, the other cannot satisfy the use requirement, and thus the silicone oil damper 3 cannot be used as well. Therefore, the present embodiment provides a method for predicting the service life of a silicone oil damper, which is based on the second embodiment, and further evaluates the remaining service life of the silicone oil damper 3 according to the viscosity of the silicone oil, so as to further ensure the accuracy of the evaluation result.
Specifically, the method for predicting the service life of the silicone oil damper comprises the following steps.
S200: and in the running process of the vehicle, the real-time temperature of the silicone oil damper 3, the real-time torque of the engine 1 and the real-time rotating speed of the engine 1 are acquired in real time.
S210: and acquiring a real-time torsional amplitude value of the silicone oil damper 3 according to the real-time rotating speed.
S220: and converting the real-time torsional amplitude value into a standard torsional amplitude value of the silicone oil damper 3 at the set temperature and the set torque according to the corresponding relation among the temperature, the torque and the torsional amplitude value.
S230: and acquiring the first remaining driving mileage of the silicone oil damper 3 according to the corresponding relation between the driving mileage and the cracking amount of the torsional amplitude value.
S240: the base silicone oil viscosity of the silicone oil damper 3 is obtained.
The concrete structure of the silicone oil damper 3 is as shown in fig. 4, and the silicone oil damper 3 includes a housing 31 and an inertia ring 32 provided in the housing 31, the housing 31 and the inertia ring 32 being coaxially provided, and a gap being provided between an inner peripheral surface of the housing 31 and an outer peripheral surface of the inertia ring 32. The formula for obtaining the viscosity of the basic silicone oil of the silicone oil damper 3 is as follows:
wherein eta is the viscosity of the basic silicone oil; ζ is the damping ratio; c tC Is a critical damping coefficient; nc is the flow index of the silicone oil; r 1 The outer diameter of inertia ring 32; r 2 The inner diameter of inertia ring 32; b is the thickness of the inertia ring 32; delta c Is the gap between the housing 31 and the inertia ring 32; q is the quality factor of silicone oil and is a constant.
S250: and converting the viscosity of the base silicone oil into the viscosity of the standard silicone oil of the silicone oil damper 3 at the set temperature and the set frequency according to the conversion relation among the temperature, the frequency and the viscosity.
The correspondence relationship between the temperature, the frequency and the viscosity can be obtained through a large number of experiments in the early stage, and the correspondence relationship between the temperature, the frequency and the viscosity is prestored in the controller 7. Wherein, the conversion relation among the temperature, the frequency and the viscosity is as follows:
η(t equil ，ω q )＝V(t equil -t,ω q )+η；
wherein, t equil To a set temperature; t is the real-time temperature; omega q The frequency is set, specifically, the rotation frequency of a crankshaft of the engine 1 can be calculated by the existing formula according to the rotation speed of the engine 1; eta (t) equil ，ω q ) The standard silicone oil viscosity of the silicone oil damper 3 at a set temperature and a set frequency is set; v (t) equil -t,ω q ) The correction quantity of the viscosity of the silicone oil relative to the difference value of the real-time temperature and the set temperature is obtained. V (t) equil -t,ω q ) Can pass through a large amount of the previous periodA relation graph of the difference value of the real-time temperature and the set temperature and the standard torsion amplitude value under the set frequency is obtained in a test and is prestored in the controller 7. As shown in fig. 5, V (t) is exemplarily given in the present embodiment equil -t,ω q )＝p02*ω q 2 +p01*ω q +p10*(t equil -t)+p11*ω q (t equil -t) + p00, p00, p01, p02, p10 and p11 are all constants.
S260: and acquiring a second remaining driving mileage of the silicone oil damper 3 according to the corresponding relationship between the driving mileage and the cracking rate of the viscosity of the silicone oil.
Wherein, the cracking rate of the silicone oil viscosity is the ratio of the standard silicone oil viscosity at any moment in the service life range of the silicone oil damper 3 to the standard silicone oil viscosity when the silicone oil damper 3 is used for the first time. The correspondence between the mileage and the cracking rate of the viscosity of silicone oil can be obtained through a large number of experiments in the early stage, and the correspondence between the cracking rate of the viscosity of silicone oil is prestored in the controller 7.
In this embodiment, the corresponding relationship between the driving mileage and the cracking rate of the viscosity of the silicone oil is as follows:
S η ＝(η failure -η s1 )/V η_rate ；
V η_rate ＝(η s1 -η s0 )/S a ；
wherein the content of the first and second substances,
S η the remaining driving mileage of the silicone oil damper 3; eta failure The cracking rate of the viscosity of the silicone oil when the silicone oil damper 3 fails; eta s1 For the distance S traveled by the vehicle a Viscosity cracking rate, eta, of silicone oil just after completion of the process of (1) S0 For the distance S traveled by the vehicle a Viscosity cracking rate of silicone oil, V, at the very beginning of the process of (1) η_rate For the distance S traveled by the vehicle a The change rate of the silicone oil viscosity cracking rate of the silicone oil damper 3 in the process of (1); eta 0 The standard silicone oil viscosity under the set temperature and the set torque is adopted when the silicone oil damper 3 is used for the first time; eta n When the preset silicone oil damper 3 fails laterAnd (5) setting the standard silicone oil viscosity under the conditions of fixed temperature and set torque.
In the formula S η ＝(η failure -η s1 )/V η_rate And V η_rate ＝(η s1 -η s0 )/S a In, V η_rate The real-time change of the change rate of the cracking quantity of the torsional amplitude value of the silicone oil damper 3 can be reflected.
As an alternative, the corresponding relationship between the driving mileage and the cracking rate of the viscosity of the silicone oil may be:
S270: the minimum value of the first remaining mileage and the second remaining mileage is used as the remaining life of the silicone oil damper 3.
According to the method for predicting the service life of the silicone oil damper, the real-time torsional amplitude value of the silicone oil damper 3 is converted into the standard torsional amplitude value under the set temperature and the set torque, the first remaining driving mileage of the silicone oil damper 3 is evaluated through the standard torsional amplitude value, the basic silicone oil viscosity of the silicone oil damper 3 is converted into the standard silicone oil viscosity under the set temperature and the set frequency, the second remaining driving mileage of the silicone oil damper 3 is evaluated through the standard silicone oil viscosity, the influence of different real-time working conditions on the torsional amplitude value can be avoided, and the accuracy of an evaluation result is ensured. And, by comparing the first remaining mileage with the second remaining mileage, the minimum value is taken as the remaining life of the silicone oil damper 3, and the safety of the silicone oil damper 3 is sufficiently ensured.
Example four
As shown in fig. 6, the present embodiment provides a method for predicting the life of a silicone oil damper, and the method for predicting the life of a silicone oil damper 3 includes the following steps.
S300: it was confirmed that the trigger condition for the lifetime of the silicone oil damper 3 was satisfied.
Specifically, the trigger conditions for confirming whether the life of the silicone oil damper 3 is satisfied include:
s301: and acquiring the driving mileage of the vehicle after the service life of the last silicone oil damper 3 is predicted.
The controller 7 can acquire the driving mileage of the vehicle after the service life prediction of the last silicone oil damper 3 stored in the vehicle control unit 2 is finished by interacting with the vehicle control unit 2.
S302: and judging that the driving mileage is within the set mileage range.
And executing S303 if the driving mileage is within the set mileage range, and if the driving mileage is outside the set mileage range, re-confirming whether the triggering condition of the service life of the silicone oil damper 3 is met.
S303: and acquiring the rotating speed of the engine 1, the real-time torque of the engine 1 and the temperature of the silicone oil damper 3.
S304: and judging whether the rotating speed of the engine 1 is within a set rotating speed range, whether the real-time torque of the engine 1 is within a set torque range, and whether the temperature of the silicone oil damper 3 is within a set temperature range.
If the rotating speed of the engine 1 is within a set rotating speed range, the real-time torque of the engine 1 is within a set torque range, and the temperature of the silicone oil damper 3 is within a set temperature range, determining that the trigger condition of the service life of the silicone oil damper 3 is met; and if the rotating speed of the engine 1 is out of the set rotating speed range, and/or the real-time torque of the engine 1 is out of the set torque range, and/or the temperature of the silicone oil damper 3 is out of the set temperature range, re-confirming whether the trigger condition of the service life of the silicone oil damper 3 is met.
It should be noted that the set mileage range, the set rotation speed range, the set torque range, and the set temperature range are stored in the controller 7 in advance, and the set mileage range, the set rotation speed range, the set torque range, and the set temperature range may be set as needed. In the embodiment, a set mileage range is not less than 0.3 kilometer, and a set rotating speed range is between the lowest rotating speed and the highest empty vehicle rotating speed under the maximum torque of the vehicle; setting the torque range to be greater than 70% of the maximum torque of the vehicle; the temperature range is set to at least 55 ℃ and the temperature is kept fluctuating within ± 2 ℃ during 60 s.
S310: and in the running process of the vehicle, the real-time temperature of the silicone oil damper 3, the real-time torque of the engine 1 and the real-time rotating speed of the engine 1 are acquired in real time.
S320: and acquiring a real-time torsional amplitude value of the silicone oil damper 3 according to the real-time rotating speed.
S330: and judging whether the real-time torsional amplitude value is within a first set torsional amplitude value range, executing S340 when the real-time torsional amplitude value is within or exceeds the first set torsional amplitude value range, and executing S350 when the real-time torsional amplitude value exceeds the first set torsional amplitude value range.
S340: and sending an alarm prompt.
In particular, audible and visual alarms may be issued by voice or display.
S350: and converting the real-time torsional amplitude value into a standard torsional amplitude value of the silicone oil damper 3 at the set temperature and the set torque according to the corresponding relation among the temperature, the torque and the torsional amplitude value.
S360: judging whether the standard torsion amplitude value is within the set standard torsion amplitude value range, and executing S370 if the standard torsion amplitude value is within the set torsion amplitude value range; if the standard torsion amplitude value is outside the set torsion amplitude value range, S300 is executed.
S370: and acquiring the first remaining driving mileage of the silicone oil damper 3 according to the corresponding relation between the driving mileage and the cracking amount of the torsional amplitude value.
S380: the base silicone oil viscosity of the silicone oil damper 3 is obtained.
S390: and converting the viscosity of the base silicone oil into the viscosity of the standard silicone oil of the silicone oil damper 3 at the set temperature and the set frequency according to the conversion relation among the temperature, the frequency and the viscosity.
S400: and acquiring a second remaining driving mileage of the silicone oil damper 3 according to the corresponding relationship between the driving mileage and the cracking rate of the viscosity of the silicone oil.
S410: the minimum value of the first remaining mileage and the second remaining mileage is used as the remaining life of the silicone oil damper 3, and the remaining life of the silicone oil damper 3 is displayed by the display device 8.
S420: and judging the residual service life of the silicone oil damper 3.
When the residual life of the silicone oil damper 3 is less than Z 1 If so, then execute S430; when the residual life of the silicone oil damper 3 is greater than or equal to Z 1 And is less than Z 2 If yes, executing S440; when the residual life of the silicone oil damper 3 is greater than or equal to Z 3 If so, executing S450; wherein Z is 1 ＜Z 2 ＜Z 3 。
S430: limiting the torque of the vehicle to be within a set torque range, and limiting the speed of the vehicle to be within a set speed range;
s440: and sending out a prompt of needing maintenance.
S450: and sending out a prompt that the silicone oil damper 3 is normal.
It should be noted that, in the present embodiment, Z 1 、Z 2 And Z 3 The specific numerical value of (A) can be set according to actual needs. Such as Z 1 Is 50 km, Z 2 Is 10000 km, Z 3 Is 50000 km
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (13)
1. A method for predicting the life of a silicone oil damper (3) mounted on a crankshaft of an engine (1) of a vehicle, comprising:
in the running process of a vehicle, acquiring the real-time temperature of the silicone oil damper (3), the real-time torque of the engine (1) and the real-time rotating speed of the engine (1) in real time;
acquiring a real-time torsion amplitude value of the silicone oil damper (3) according to the real-time rotating speed;
converting the real-time torsional amplitude value into a standard torsional amplitude value of the silicone oil damper (3) at a set temperature and a set torque according to the corresponding relation among the temperature, the torque and the torsional amplitude value;
acquiring a first remaining driving mileage of the silicone oil damper (3) according to a corresponding relation between the driving mileage and a cracking amount of the torsional vibration amplitude value, wherein the cracking amount of the torsional vibration amplitude value is a difference value between a standard torsional vibration amplitude value at any moment in a service life range of the silicone oil damper (3) and the standard torsional vibration amplitude value when the silicone oil damper (3) is used for the first time;
acquiring the viscosity of basic silicone oil of the silicone oil damper (3);
according to the conversion relation among the temperature, the frequency and the viscosity, converting the viscosity of the basic silicone oil into the viscosity of the standard silicone oil of the silicone oil damper (3) at the set temperature and the set frequency;
acquiring a second remaining driving mileage of the silicone oil damper (3) according to a corresponding relation between the driving mileage and a cracking rate of the silicone oil viscosity, wherein the cracking rate of the silicone oil viscosity is a ratio of a standard silicone oil viscosity at any moment in a service life range of the silicone oil damper (3) to the standard silicone oil viscosity when the silicone oil damper (3) is used for the first time;
and taking the minimum value of the first remaining driving mileage and the second remaining driving mileage as the remaining life of the silicone oil damper (3).
2. The silicone oil damper life prediction method as set forth in claim 1, characterized in that the vehicle travel distance S a In the process, the viscosity of the corresponding standard silicone oil at the beginning is the first standard silicone oil viscosity eta 1 The viscosity of the corresponding standard silicone oil at the beginning is the viscosity eta of the second standard silicone oil 2 ；
The corresponding relation between the driving mileage and the cracking rate of the viscosity of the silicone oil is as follows:
S η ＝(η failure -η s1 )/V η_rate ；
V η_rate ＝(η s1 -η s0 )/S a ；
or the corresponding relation between the driving mileage and the cracking rate of the viscosity of the silicone oil is as follows:
wherein the content of the first and second substances,
S η and
the residual driving mileage of the silicone oil shock absorber (3) is obtained; eta failure The cracking rate of the viscosity of the silicone oil when the silicone oil damper (3) fails; eta s1 For the distance S traveled by the vehicle a The viscosity cracking rate of silicone oil immediately after the completion of the process of (1); eta S0 For the distance S traveled by the vehicle a The viscosity cracking rate of the silicone oil at the beginning in the process of (1); v η_rate For the distance S traveled by the vehicle a The change rate of the silicone oil viscosity cracking rate of the silicone oil damper (3) in the process of (2); eta 0 The standard silicone oil viscosity is set at a set temperature and a set torque when the silicone oil damper (3) is used for the first time; eta n Set at a preset temperature when the preset silicone oil damper (3) failsStandard silicone oil viscosity at torque;
is the average change rate of the viscosity cracking rate of the silicone oil damper (3) in the service life and is constant.
3. The silicone oil damper life prediction method according to claim 1, characterized in that the silicone oil damper (3) includes a housing (31) and an inertia ring (32) disposed inside the housing (31), and the formula for obtaining the base silicone oil viscosity of the silicone oil damper (3) is:
wherein eta is the viscosity of the basic silicone oil; ζ is the damping ratio; c tC Is a critical damping coefficient; nc is the flow index of the silicone oil; r 1 Is the outer diameter of the inertia ring (32); r 2 Is the inner diameter of the inertia ring (32); b is the thickness of the inertia ring (32); delta c Is a gap between the housing (31) and the inertia ring (32); q is the quality factor of silicone oil and is a constant.
4. The method for predicting the life of the silicone oil damper according to claim 3, wherein the conversion relationship among the temperature, the frequency and the viscosity is as follows:
η(t equil ，ω q )＝V(t equil -t,ω q )+η；
wherein, t equil To a set temperature; t is the real-time temperature; omega q To set the frequency; eta (t) equil ，ω q ) The standard silicone oil viscosity of the silicone oil damper (3) at a set temperature and a set frequency is set; v (t) equil -t,ω q ) Correction of the difference between the viscosity of the silicone oil with respect to the real-time temperature and the set temperatureA positive amount.
5. The silicone oil damper life prediction method according to claim 1, characterized in that the magnitude of the remaining life of the silicone oil damper (3) is judged;
when the residual life of the silicone oil damper (3) is less than Z 1 When the vehicle speed is within the set speed range, limiting the torque of the vehicle to be within the set torque range;
when the residual life of the silicone oil damper (3) is greater than or equal to Z 1 And is less than Z 2 Sending out a prompt of needing maintenance;
when the residual life of the silicone oil damper (3) is greater than or equal to Z 3 When the shock absorber is normal, a prompt that the silicone oil shock absorber (3) is normal is sent;
wherein Z is 1 ＜Z 2 ＜Z 3 。
6. The silicone oil damper life prediction method according to claim 1,
vehicle running distance S b In the process of (3), the corresponding standard torque amplitude value at the beginning is the first standard torque amplitude value T 1 The standard torque amplitude value corresponding to the end is the second standard torque amplitude value T 2 ；
The corresponding relation between the driving mileage and the cracking amount of the torsional amplitude value is as follows:
S T ＝(T failure -T s1 )/V T_rate ；
V T_rate ＝(T s1 -T s0 )/S b ；
or the corresponding relation between the driving mileage and the cracking amount of the torsional amplitude value is as follows:
wherein, T failure ＝T n -T 0 ，T s1 ＝T 2 -T 0 ，T s0 ＝T 1 -T 0 ；S T And
the residual driving mileage of the silicone oil shock absorber (3) is obtained; t is failure The cracking quantity is the torsional amplitude value when the silicone oil damper (3) fails; t is s1 For the distance S traveled by the vehicle b Amount of cracking, T, of torsional vibration amplitude value immediately after the completion of the process of (1) S0 For the distance S traveled by the vehicle b Amount of cracking, V, of torsional vibration amplitude value at the beginning of the process of (1) T_rate For the distance S traveled by the vehicle b The change rate of the cracking amount of the torsional amplitude value of the silicone oil damper (3) in the process; t is 0 The method comprises the steps that a preset standard torsion amplitude value of the silicone oil damper (3) under a set temperature and a set torque is obtained when the damper is used for the first time; t is n The standard torsion amplitude value is a standard torsion amplitude value under a set temperature and a set torque when the preset silicone oil damper (3) fails;
is the average change rate of the cracking amount of the torsional vibration amplitude value in the service life of the silicone oil damper (3) and is constant.
7. The silicone oil damper life prediction method according to claim 1, characterized in that a crankshaft is provided with a tachometer signal panel (5), a tachometer sensor (6) is used for acquiring the angle of rotation of the tachometer signal panel (5), and the formula for acquiring the real-time torsional amplitude value of the silicone oil damper (3) according to the real-time rotational speed is as follows:
wherein, t n Is time; theta (t) n ) Is torsional angular displacement; omega p Is the instantaneous angular velocity; t is t c For turning the signal panel by one turnThe time of (d); n is the total number of teeth of the rotating speed signal panel (5); n is t n The number of teeth of the rotating speed signal disc (5) which is experienced at the moment;
is the average torsional angular displacement and is constant; k is an integral multiple of 0.5; theta k A real-time torsional amplitude value at the kth harmonic; delta k Is the initial phase of torsional oscillation at the k-th harmonic and is constant.
8. The method for predicting the service life of the silicone oil damper according to claim 7, wherein the corresponding relationship among the temperature, the torque and the torsional amplitude value is as follows:
T(t equil ，load full )＝U(t equil -t)+L(load full -load)+T(t，load)；
wherein, t equil To set the temperature, load full For set torque, T is the real time temperature, load is the real time torque, T (T) equil ，load full ) The standard torsion amplitude value of the silicone oil damper (3) at a set temperature and a set torque is obtained; u (t) equil -t) correction of the torque amplitude value with respect to the difference between the real time temperature and the set temperature, L (load) full Load) is a correction of the torque amplitude value with respect to the difference between the real-time torque and the set torque; t (T, load) ═ θ k 。
9. The method for predicting the service life of the silicone oil damper according to claim 1, wherein after acquiring the real-time torsional amplitude value, whether the real-time torsional amplitude value is within a first set torsional amplitude value range is determined, when the real-time torsional amplitude value is within or exceeds the first set torsional amplitude value range, the real-time torsional amplitude value is converted into a standard torsional amplitude value of the silicone oil damper (3) under a set temperature and a set torque, and when the real-time torsional amplitude value exceeds the first set torsional amplitude value range, an alarm prompt is given.
10. The method for predicting the service life of the silicone oil damper according to claim 1, wherein after a standard torsional amplitude value is obtained, whether the standard torsional amplitude value is within a set standard torsional amplitude value range is judged, and if the standard torsional amplitude value is within the set torsional amplitude value range, the obtaining of the first remaining driving mileage of the silicone oil damper (3) is performed.
11. The silicone oil damper life prediction method as set forth in any one of claims 1-10, characterized in that it further comprises, before the real-time temperature of the silicone oil damper (3) and the real-time torque of the engine (1) are collected in real time during the running of the vehicle:
confirming that the trigger condition of the service life of the silicone oil damper (3) is met.
12. The silicone oil damper life prediction method according to claim 11, characterized in that confirming that the trigger condition for the life of the silicone oil damper (3) is met includes:
acquiring the driving mileage of the vehicle after the service life of the last silicone oil damper (3) is predicted to be finished;
judging and confirming that the driving mileage is within the set mileage range;
acquiring the rotating speed of an engine (1);
acquiring real-time torque of an engine (1);
acquiring the temperature of the silicone oil damper (3);
and judging and confirming that the rotating speed of the engine (1) is within a set rotating speed range, the real-time torque of the engine (1) is within a set torque range, and the temperature of the silicone oil damper (3) is within a set temperature range, and then confirming that the trigger condition of the service life of the silicone oil damper (3) is met.
13. A vehicle, characterized in that the vehicle comprises:
an engine (1);
the vehicle control unit (2) can acquire real-time torque output by the engine (1);
a silicone oil damper (3) provided on a crankshaft of the engine (1);
a temperature sensor (4) for acquiring the temperature of the silicone oil damper (3),
a rotational speed signal panel (5) provided to a crankshaft of the engine (1);
the rotating speed sensor (6) is used for acquiring the rotating angle of the rotating speed signal panel (5);
the controller (7) is connected with the temperature sensor (4) to acquire the real-time temperature of the silicone oil damper (3); is connected with the rotating speed sensor (6) to acquire the real-time rotating speed of the engine (1); for interacting with said vehicle control unit (2) to obtain said real-time torque, said controller (7) being adapted to carry out the silicone oil damper life prediction method of any one of claims 1 to 12.
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