CN113968207B - Method for identifying oil quality of hydrodynamic retarder - Google Patents
Method for identifying oil quality of hydrodynamic retarder Download PDFInfo
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- CN113968207B CN113968207B CN202111243746.1A CN202111243746A CN113968207B CN 113968207 B CN113968207 B CN 113968207B CN 202111243746 A CN202111243746 A CN 202111243746A CN 113968207 B CN113968207 B CN 113968207B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
- B60T17/221—Procedure or apparatus for checking or keeping in a correct functioning condition of brake systems
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T2250/00—Monitoring, detecting, estimating vehicle conditions
- B60T2250/04—Vehicle reference speed; Vehicle body speed
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Abstract
The application relates to a method for identifying oil quality of a hydrodynamic retarder. According to the method, the running state of the vehicle is detected when the vehicle is in a deceleration working condition, the actual torque value and the normal torque value provided by the retarder for the vehicle are calculated, and the current torque deviation rate of the vehicle is calculated, so that the oil quality of the hydraulic retarder is estimated according to the comparison result of various statistical data of the current retarder and a judgment threshold, and further maintenance prompts of different levels are given. According to the real-time running state of the retarder, the quality of the oil of the retarder is accurately identified, the braking performance of the vehicle can be guaranteed, and dangers are effectively avoided.
Description
Technical Field
The application relates to the field of oil quality estimation, in particular to a method and a device for identifying oil quality of a hydraulic retarder, computer equipment and a storage medium.
Background
At present, aiming at the identification of the oil quality, a sensor is generally adopted for signal acquisition and identification, and aiming at the identification of the retarder oil quality, a corresponding method is not provided, so that the retarder oil quality is accurately identified, and the method has an important effect on the braking performance and the safety of a vehicle. In the related art, it is common to use the running time and the number of kilometers of the vehicle for maintenance indication. However, due to the different operating conditions of the vehicles, the method has great uncertainty and uniformity, and is difficult to accurately identify the specific operating condition of the specific vehicle. The running working conditions of the vehicle comprise deceleration, acceleration and constant speed states.
Disclosure of Invention
Therefore, the method for identifying the quality of the hydraulic retarder oil liquid is needed to be provided for solving the technical problems.
A method for identifying the oil quality of a hydrodynamic retarder comprises the following steps:
(1) if the vehicle is braked by using a retarder and the current torque demand value of the vehicle hits any one target value in a target value set, adding 1 to the first preset number, and calculating the current torque deviation rate of the vehicle, wherein the target value set consists of a preset number of torque demand target values;
(2) if the torque deviation rate is larger than the torque deviation rate threshold value, adding 1 to the second pre-designed quantity;
(3) deleting a target value which is the same as the current value of the torque demand from the target value set;
(4) repeating the processes from (1) to (3) until the first preset counting amount is equal to the preset number, and calculating an average torque deviation rate according to the calculated torque deviation rate at each hit;
(5) if the second preset counting quantity is not greater than the quality judgment threshold, resetting the target value set, the first preset quantity and the second preset quantity, and repeatedly executing the processes from (1) to (4) until the second preset counting quantity is greater than the quality judgment threshold;
and determining the oil liquid quality of the retarder according to the average torque deviation rate finally calculated when the second preset counting amount is larger than the quality judgment threshold.
In one embodiment, the calculation of the current value of the torque demand includes:
calculating a first torque demand value corresponding to the retarder under the current gear;
calculating a second torque demand value based on a difference between a current actual speed of the vehicle and a target speed set in a cruise control system of the vehicle;
calculating a third torque demand value based on the current actual speed of the vehicle and the target speed set in the constant speed control;
a current torque request value is determined based on the first, second, and third torque requests.
In one embodiment, determining the current torque request value based on the first torque request value, the second torque request value, and the third torque request value includes:
a maximum value is selected from the first, second and third torque demand values and is used as the current torque demand value.
In one embodiment, calculating the current torque offset rate of the vehicle comprises:
and calculating the current actual torque value and the normal torque value of the vehicle, and calculating the current torque deviation rate of the vehicle according to the actual torque value and the normal torque value.
In one embodiment, the calculation of the actual torque value includes:
T b ·i g ＝T f +M·a·r+J·α；
wherein, T b Is the actual torque value, T f Is the frictional resistance moment, i g And the speed reduction ratio of the rear axle is r, the radius of the tire is r, the moment of inertia of the transmission shaft is J, and the angular acceleration of the transmission shaft is alpha.
In one embodiment, the normal torque value is obtained from a table prepared from data measured by bench tests, the actual rotating speed and the corresponding relationship between the rotating speed and the torque value in the table.
In one embodiment, the calculation of the torque deviation ratio comprises:
S＝(T a -T b )/T a ×100％；
wherein S is a torque deviation ratio, T a Is the normal torque value.
An identification device of hydraulic retarber fluid quality, the device includes:
the system comprises a hit module, a first calculation module and a second calculation module, wherein the hit module is used for adding 1 to a first preset quantity and calculating the current torque deviation rate of the vehicle when the vehicle is braked by using a retarder and the current torque demand value of the vehicle hits any one target value in a target value set, and the target value set consists of a preset quantity of torque demand target values;
the comparison module is used for adding 1 to the second pre-designed quantity when the torque deviation rate is larger than the torque deviation rate threshold value;
the deleting module is used for deleting a target value which is the same as the current value of the torque demand from the target value set;
the first circulation module is used for repeatedly executing the processes corresponding to the hit module, the comparison module and the deletion module until the first preset counting amount is equal to the preset number, and calculating the average torque deviation rate according to the torque deviation rate calculated in each hit;
the second circulation module is used for resetting the target value set, the first pre-designed quantity and the second pre-designed quantity when the second preset counting quantity is not greater than the quality judgment threshold value, and repeatedly executing the processes corresponding to the hit module, the comparison module, the deletion module and the first circulation module until the second preset counting quantity is greater than the quality judgment threshold value;
and the quality identification module is used for determining the oil liquid quality of the retarder according to the average torque deviation rate finally calculated when the second preset counting amount is greater than the quality judgment threshold.
A computer device comprising a memory and a processor, the memory storing a computer program, the processor implementing the following steps when executing the computer program:
(1) if the vehicle is braked by using a retarder and the current torque demand value of the vehicle hits any one target value in a target value set, adding 1 to the first preset number, and calculating the current torque deviation rate of the vehicle, wherein the target value set consists of a preset number of torque demand target values;
(2) if the torque deviation rate is larger than the torque deviation rate threshold value, adding 1 to the second pre-designed quantity;
(3) deleting a target value which is the same as the current value of the torque demand from the target value set;
(4) repeating the processes from (1) to (3) until the first preset counting amount is equal to the preset number, and calculating an average torque deviation rate according to the calculated torque deviation rate at each hit;
(5) if the second preset counting quantity is not greater than the quality judgment threshold, resetting the target value set, the first preset quantity and the second preset quantity, and repeatedly executing the processes from (1) to (4) until the second preset counting quantity is greater than the quality judgment threshold;
and determining the oil liquid quality of the retarder according to the average torque deviation rate finally calculated when the second preset counting amount is larger than the quality judgment threshold.
A computer-readable storage medium, on which a computer program is stored which, when executed by a processor, carries out the steps of:
(1) if the vehicle is braked by using a retarder and the current torque demand value of the vehicle hits any one target value in a target value set, adding 1 to the first preset number, and calculating the current torque deviation rate of the vehicle, wherein the target value set consists of a preset number of torque demand target values;
(2) if the torque deviation rate is larger than the torque deviation rate threshold value, adding 1 to the second pre-designed quantity;
(3) deleting the target value which is the same as the current value of the torque demand from the target value set;
(4) repeating the processes from (1) to (3) until the first preset counting amount is equal to the preset number, and calculating an average torque deviation rate according to the calculated torque deviation rate at each hit;
(5) if the second preset counting quantity is not greater than the quality judgment threshold, resetting the target value set, the first preset quantity and the second preset quantity, and repeatedly executing the processes from (1) to (4) until the second preset counting quantity is greater than the quality judgment threshold;
and determining the oil liquid quality of the retarder according to the average torque deviation rate finally calculated when the second preset counting amount is larger than the quality judgment threshold.
The method for identifying the oil quality of the hydrodynamic retarder is disclosed. The method comprises the steps of detecting the running state of a vehicle when the vehicle is in a deceleration working condition, calculating an actual torque value and a normal torque value which are provided by the retarder for the vehicle, and calculating the current torque deviation rate of the vehicle, so that the quality of oil of the hydraulic retarder is estimated according to the comparison result of various statistical data of the current retarder and a judgment threshold, and further maintenance prompts of different levels are given. According to the real-time running state of the retarder, the quality of the oil of the retarder is accurately identified, the braking performance of the vehicle can be guaranteed, and dangers are effectively avoided.
Drawings
Fig. 1 is a schematic flow chart of an identification method for oil quality of a hydraulic retarder in an embodiment;
FIG. 2 is a graph of normal torque values and actual torque values versus torque demand response characteristics for one embodiment;
FIG. 3 is a calculation of a current value of the torque demand in one embodiment;
FIG. 4 is a method of calculating a torque bias ratio in one embodiment;
FIG. 5 is a block diagram of a process flow of an oil quality identification algorithm in one embodiment;
FIG. 6 is a device for identifying the oil quality of a hydrodynamic retarder according to an embodiment;
FIG. 7 is a diagram of the internal structure of a computer device in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In the description of the present invention, it should be understood that the positional descriptions, such as the directions or positional relationships indicated by upper, lower, front, rear, left, right, etc., are the directions or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
At present, aiming at the identification of the oil quality, a sensor is generally adopted for signal acquisition and identification, and aiming at the identification of the retarder oil quality, a corresponding method is not provided, so that the retarder oil quality is accurately identified, and the method has an important effect on the braking performance and the safety of a vehicle. In the related art, it is common to use the running time and the number of kilometers of the vehicle for maintenance indication. However, due to the different operating conditions of the vehicles, the method has great uncertainty and uniformity, and is difficult to accurately identify the specific operating condition of the specific vehicle. The running working conditions of the vehicle comprise deceleration, acceleration and constant speed states. According to the running state of the retarder, the quality of the retarder oil is accurately estimated in real time, so that a driver is prompted to replace the retarder oil in time, the braking performance of a vehicle is guaranteed, and risks are avoided. Therefore, an identification method for the oil quality of the hydrodynamic retarder is urgently needed at present.
In view of the problems in the related art, referring to fig. 1, an embodiment of the present invention provides a method for identifying the quality of oil in a hydraulic retarder. The method is applied to a server, and an execution subject is taken as an example for explanation, and the method comprises the following steps:
101. if the vehicle is braked by using a retarder and the current torque demand value of the vehicle hits any one target value in a target value set, adding 1 to the first preset number, and calculating the current torque deviation rate of the vehicle, wherein the target value set consists of a preset number of torque demand target values;
102. if the torque deviation rate is larger than the torque deviation rate threshold value, adding 1 to the second pre-designed quantity;
103. deleting a target value which is the same as the current value of the torque demand from the target value set;
104. repeating the processes of the steps 101 to 103 until the first preset number is equal to the preset number, and calculating an average torque deviation ratio according to the calculated torque deviation ratio at each hit;
105. if the second preset counting quantity is not greater than the quality judgment threshold, resetting the target value set, the first preset quantity and the second preset quantity, and repeatedly executing the processes of the steps 101 to 104 until the second preset counting quantity is greater than the quality judgment threshold;
106. and determining the oil liquid quality of the retarder according to the average torque deviation rate finally calculated when the second preset counting amount is larger than the quality judgment threshold.
In the step 101, the retarder is a hydrodynamic retarder, and the hydrodynamic retarder is an automobile retarder for reducing the running speed of the vehicle through a hydrodynamic device. Braking refers to an operation of stopping or reducing the speed of a running locomotive, vehicle, other transportation means, machine, or the like. The general principle of braking is that a wheel or disk is fixed on the high-speed shaft of the machine, and a brake shoe, belt or disk matched with the wheel or disk is mounted on the machine base, so that the wheel or disk can produce braking torque under the action of external force. Torque is a specific moment that causes an object to rotate. It should be noted that the first preset number is used to indicate the total number of hits.
For example, the preset number of torque demand targets take on 20 torque demand target values, and if the current torque demand value of the vehicle hits any one of the 20 torque demand target values, 1 is added to the total hit number.
In addition, each torque demand target value corresponds to a torque demand percentage, each torque demand percentage corresponds to a normal torque value, and the torque demand and the normal torque value are in a linear and direct proportional relation. For example, if there are 20 torque demand target values, 20 sampling points are uniformly selected from 0% to 100% of the torque demand as 20 torque demand percentages. Referring to fig. 2, normal torque values and actual torque values versus torque demand response curves are shown, wherein: ta is the normal torque value and Tb is the actual torque value. When the torque demand increases from 0% to 100%, if the fluid quality is normal, the normal torque value that corresponds under the torque demand can be satisfied to the actual torque value, if the fluid quality is poor, the torque demand can not be satisfied to the actual torque value of vehicle retarder, and the actual torque value is less than the normal torque value that corresponds under the torque demand.
In step 102, the second preset number is used to indicate the number of times the torque deviation ratio is too high.
In the above step 103, the target value that is the same as the current value of the torque demand is deleted from the target value set every time a cycle is performed until all the torque demand target values in the target value set are hit.
In the step 105, if the number of times of the torque deviation rate is too high is not greater than the quality judgment threshold, the quality of the retarder oil is not identified. It should be noted that resetting the target value set means setting the target value set to be composed of a preset number of torque demand target values. Resetting the first predetermined number and the second predetermined number means setting the first predetermined number and the second predetermined number to zero.
In the step 106, the quality of the retarder oil is determined according to the average torque deviation ratio finally calculated when the second preset count is greater than the quality determination threshold. If the average torque deviation rate is greater than the quality level 1 judgment threshold and less than the quality level 2 judgment threshold, estimating the oil quality of the current retarder as the quality level 1; if the average torque deviation rate is greater than the quality level 2 judgment threshold and less than the quality level 3 judgment threshold, estimating that the oil quality of the current retarder is the quality level 2; and if the average torque deviation rate is greater than the quality level 3 judgment threshold, estimating that the oil liquid quality of the current retarder is the quality level 3. And finally giving a corresponding prompt to the driver according to the oil quality estimation result.
According to the method provided by the embodiment of the invention, the actual torque value and the normal torque value provided by the retarder for the vehicle are calculated by detecting the running state of the vehicle when the vehicle is in the deceleration working condition, and the current torque deviation rate of the vehicle is calculated, so that the oil quality of the hydraulic retarder is estimated according to the comparison result of various statistical data of the current retarder and the judgment threshold, and further, maintenance prompts of different levels are given. According to the real-time running state of the retarder, the quality of the oil of the retarder is accurately identified, the braking performance of the vehicle can be guaranteed, and dangers are effectively avoided.
In conjunction with the above description of the embodiments, referring to fig. 3, in some embodiments, the calculation of the current value of the torque demand is not specifically limited by the embodiments of the present invention, including but not limited to:
1011. calculating a first torque demand value corresponding to the retarder under the current gear;
1012. calculating a second torque demand value based on a difference between a current actual speed of the vehicle and a target speed set in a cruise control system of the vehicle;
1013. calculating a third torque demand value based on the current actual speed of the vehicle and the target speed set in the constant speed control;
1014. a current torque request value is determined based on the first, second, and third torque requests.
In step 1011, the driver shifts the retarder handle to a corresponding gear, and a torque value is used as a first torque demand value in the current gear.
In step 1012, the vehicle cruise control system is also called a constant speed driving system, and in a certain vehicle speed range, the driver sets a vehicle speed through the cruise control key, and the vehicle can automatically drive at a constant speed without stepping on the accelerator. The vehicle speed set by the cruise control key is taken as a target speed, and the difference between the torque value corresponding to the current actual speed of the vehicle and the torque value corresponding to the target speed is taken as a second torque demand value.
In the above step 1013, the target speed set in the constant speed control is a speed corresponding to the moment when the driver starts the accelerator release of the vehicle, and the difference between the torque value corresponding to the current actual speed of the vehicle and the torque value corresponding to the target speed is taken as the third torque demand value.
According to the method provided by the embodiment of the invention, the driver can activate the braking torque by dialing the retarder handle, and controlling the vehicle cruise or controlling the constant speed, so that the corresponding torque demand values under the three functions are respectively calculated, and the current value of the torque demand is further determined. The calculation accuracy of the current value of the torque demand is ensured, and the braking performance of the automobile is improved.
In conjunction with the above description of the embodiments, in some embodiments, the present invention does not specifically limit the determination of the current value of the torque demand based on the first, second and third torque demand values, including but not limited to:
a maximum value is selected from the first, second and third torque demand values and is used as the current torque demand value.
In the above steps, the maximum value of the first torque demand value, the second torque demand value and the third torque demand value respectively corresponding to the three functions of activating the retarder braking torque is taken as the current torque demand value.
According to the method provided by the embodiment of the invention, the maximum value of the torque demand is selected as the current value of the torque demand, so that the calculation accuracy of the current value of the torque demand is ensured, and the braking performance of the automobile is improved.
In combination with the above description of the embodiments, in some embodiments, the embodiments of the present invention do not specifically limit the calculation of the current torque deviation ratio of the vehicle, including but not limited to:
and calculating the current actual torque value and the normal torque value of the vehicle, and calculating the current torque deviation rate of the vehicle according to the actual torque value and the normal torque value.
In the above steps, an actual torque value and a normal torque value under the condition that the vehicle is in a deceleration condition and is braked by using the retarder are calculated, and the current torque deviation rate of the vehicle is calculated according to the difference state of the actual torque value and the normal torque value.
According to the method provided by the embodiment of the invention, the actual torque value and the normal torque value provided by the retarder for the vehicle are calculated through the running state of the vehicle under the deceleration working condition, so that the current torque deviation rate of the vehicle is calculated, the real-time state of the vehicle retarder can be detected, and the braking performance of the vehicle is ensured.
In combination with the above description of the embodiments, in some embodiments, the embodiment of the present invention does not specifically limit the calculation process of the actual torque value, including but not limited to:
T b ·i g ＝T f +M·a·r+J·α；
wherein, T b Is the actual torque value, T f Is the frictional resistance moment, i g And the speed reduction ratio of the rear axle is r, the radius of the tire is r, the moment of inertia of the transmission shaft is J, and the angular acceleration of the transmission shaft is alpha.
In the above step, the actual torque value T of the retarder is calculated according to the vehicle dynamics principle b According to the mass M of the vehicle and the acceleration a of the vehicle, an equation T is applied b ·i g ＝T f The + M · a · r + J · α calculates an actual torque value of the vehicle.
According to the method provided by the embodiment of the invention, the actual data of the vehicle in operation is calculated through the corresponding formula according to the vehicle dynamics principle, so that the actual torque value of the vehicle is obtained. By introducing the corresponding formula, the actual torque value of the vehicle can be accurately calculated, and the accuracy of vehicle real-time data state statistics is improved.
In some embodiments, the normal torque value is obtained from a table made of data measured by bench tests, the actual rotating speed, and the corresponding relationship between the rotating speed and the torque value in the table.
And (3) performing bench test measurement by combining the actual external characteristics of the retarder according to the rotating speed and the actual air pressure, making the measured data into a table, and obtaining the normal torque value of the vehicle according to the corresponding relation between the rotating speed and the torque value in the table and the actual rotating speed.
According to the method provided by the embodiment of the invention, the current normal torque value of the vehicle is calculated according to the corresponding relation between the rotating speed and the torque value in the table measured by the bench experiment, and the reliability and the accuracy of the calculation of the normal torque value are ensured through the data measured by the experiment.
In combination with the above description of the embodiments, in some embodiments, the embodiments of the present invention do not specifically limit the calculation process of the torque deviation ratio, including but not limited to:
S＝(T a -T b )/T a ×100％；
wherein S is a torque deviation ratio,T a is the normal torque value.
Referring to fig. 4, the current torque deviation rate of the vehicle is calculated according to the calculated actual torque value and the normal torque value of the vehicle through a formula.
According to the method provided by the embodiment of the invention, the current torque deviation rate of the vehicle is obtained by comparing and calculating the difference value of the current actual torque value and the normal torque value of the vehicle through the formula, the current torque deviation state of the vehicle can be more accurately reflected through the formula calculation mode, and the accuracy of oil quality identification can be effectively improved.
For convenience of understanding, the overall flow of the method for governing the user-changing relationship of the power grid enterprise according to the embodiment of the present invention is described with reference to the processes of the foregoing embodiments, and specifically, the following steps are performed:
referring to fig. 5, the invention provides an oil quality identification algorithm, wherein: l1 is a quality class 1 wide value, l2 is a quality class 2 wide value, l3 is a quality class 3 wide value, Mmin is a quality wide value, Sa is a mean torque deviation ratio, M is the number of times of excessive torque deviation ratio, and K is the total number of hits. And presetting 20 torque demand target values, and forming a target value set by the 20 torque demand target values. And uniformly selecting 20 sampling points from 0% to 100% of the torque demand as 20 torque demand percentages, wherein each torque demand target value corresponds to one torque demand percentage. And if the vehicle is braked by using the retarder and the current torque demand current value of the vehicle hits any target value in the target value set, recording the real-time data of the vehicle and calculating the current torque deviation rate of the vehicle. And if the torque deviation rate is greater than the torque deviation rate threshold value, adding 1 to the number of times of the torque deviation rate overhigh until the total hit number is equal to 20, and completing one-time data statistics. And calculating the average torque deviation ratio according to the torque deviation ratio calculated when the speed reducer hits for 20 times, and judging the oil liquid quality of the speed reducer if the number of times of the torque deviation ratio is too high is greater than a quality judgment threshold value. If the average torque deviation rate is larger than the quality level 1 judgment threshold and smaller than the quality level 2 judgment threshold, estimating that the oil quality of the current retarder is the quality level 1; if the average torque deviation rate is greater than the quality level 2 judgment threshold and less than the quality level 3 judgment threshold, estimating that the oil quality of the current retarder is the quality level 2; and if the average torque deviation rate is greater than the quality level 3 judgment threshold, estimating that the oil liquid quality of the current retarder is the quality level 3. And finally giving a corresponding prompt to the driver according to the oil quality estimation result.
It should be understood that although the steps in the flowcharts of fig. 1 and 3 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 1 and 3 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of performing the steps or stages is not necessarily sequential, but may be performed alternately or alternately with other steps or at least some of the other steps or stages.
It should be noted that the technical solutions described above may be implemented as independent embodiments in actual implementation processes, or may be combined with each other and implemented as combined embodiments. In addition, when the contents of the embodiments of the present invention are described above, the different embodiments are described according to the corresponding sequence only based on the idea of convenience of description, and the execution sequence between the different embodiments is not limited, and the execution sequence of the steps in the embodiments is not limited. Accordingly, in the actual implementation process, if it is necessary to implement multiple embodiments provided by the present invention, the execution sequence provided in the embodiments of the present invention is not necessarily required, but the execution sequence between different embodiments may be arranged according to requirements.
In combination with the content of the foregoing embodiments, in an embodiment, as shown in fig. 6, there is provided an apparatus for identifying oil quality of a hydraulic retarder, including: a hit module 601, a comparison module 602, a deletion module 603, a first loop module 604, a second loop module 605, a qualification module 606, wherein:
the hit module 601 is configured to, when the vehicle is braked by using a retarder and a current torque demand value of the vehicle hits any one of target values in a target value set, add 1 to a first preset number, and calculate a current torque deviation ratio of the vehicle, where the target value set is formed by a preset number of torque demand target values;
a comparing module 602, configured to add 1 to the second pre-designed number when the torque deviation ratio is greater than the torque deviation ratio threshold;
a deleting module 603 configured to delete a target value that is the same as the current value of the torque demand from the target value set;
a first loop module 604, configured to repeatedly execute the processes corresponding to the hit module, the comparison module, and the deletion module until the first preset count is equal to the preset number, and calculate an average torque deviation ratio according to a torque deviation ratio calculated at each hit;
a second loop module 605, configured to, when the second preset count is not greater than the quality determination threshold, reset the target value set, the first preset number and the second preset number, and repeatedly execute the corresponding processes of the hit module, the comparison module, the delete module and the first loop module until the second preset count is greater than the quality determination threshold;
and the quality identification module 606 is configured to determine the oil quality of the retarder according to the average torque deviation ratio finally calculated when the second preset count is greater than the quality judgment threshold.
In one embodiment, the hit module 601 is configured to calculate a first torque demand value corresponding to the retarder in the current gear; calculating a second torque demand value based on a difference between a current actual speed of the vehicle and a target speed set in a cruise control system of the vehicle; calculating a third torque demand value based on the current actual speed of the vehicle and the target speed set in the constant speed control; a current torque request value is determined based on the first, second, and third torque requests.
In one embodiment, the hit module 601 selects a maximum value from the first, second, and third torque demand values as the current torque demand value.
In one embodiment, the hit module 601 is configured to calculate a current actual torque value and a current normal torque value of the vehicle, and calculate a current torque deviation rate of the vehicle according to the actual torque value and the normal torque value.
In one embodiment, the actual torque value is calculated by a process comprising:
T b ·i g ＝T f +M·a·r+J·α；
wherein, T b Is the actual torque value, T f Is the frictional resistance moment, i g And the speed reduction ratio of the rear axle is r, the radius of the tire is r, the moment of inertia of the transmission shaft is J, and the angular acceleration of the transmission shaft is alpha.
In one embodiment, the normal torque value is obtained from a table prepared from data measured by bench tests, the actual rotation speed, and the corresponding relationship between the rotation speed and the torque value in the table.
In one embodiment, the torque deviation ratio is calculated by:
S＝(T a -T b )/T a ×100％；
wherein S is a torque deviation ratio, T a Is the normal torque value.
In one embodiment, the comparing module 602 is configured to add 1 to the second pre-designed number when the torque deviation ratio is greater than the torque deviation ratio threshold;
in one embodiment, the deleting module 603 is configured to delete a target value that is the same as the current value of the torque demand from the set of target values;
in one embodiment, the first loop module 604 is configured to repeatedly execute the processes corresponding to the hit module, the comparison module, and the deletion module until the first preset count is equal to a preset number, and calculate an average torque deviation ratio according to a calculated torque deviation ratio at each hit;
in an embodiment, the second loop module 605 is configured to, when the second preset count is not greater than the quality determination threshold, reset the target value set, the first preset number and the second preset number, and repeatedly execute the corresponding processes of the hit module, the comparison module, the delete module and the first loop module until the second preset count is greater than the quality determination threshold;
in an embodiment, the quality evaluation module 606 is configured to determine the oil quality of the retarder according to an average torque deviation rate finally calculated when the second preset count is greater than the quality determination threshold.
According to the device provided by the embodiment of the invention, the actual torque value and the normal torque value provided by the retarder for the vehicle are calculated by detecting the running state of the vehicle when the vehicle is in a deceleration working condition, and the current torque deviation rate of the vehicle is calculated, so that the oil quality of the hydraulic retarder is estimated according to the comparison result of various statistical data of the current retarder and the judgment threshold, and further, maintenance prompts of different levels are given. According to the real-time running state of the retarder, the quality of the oil of the retarder is accurately identified, the braking performance of the vehicle can be guaranteed, and dangers are effectively avoided.
For specific limitations of the identification device for the oil quality of the hydraulic retarder, reference may be made to the above limitations of the identification method for the oil quality of the hydraulic retarder, and details are not repeated here. All modules in the device for identifying the oil quality of the hydrodynamic retarder can be completely or partially realized through software, hardware and a combination of the software and the hardware. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer device is provided, which may be a server, the internal structure of which may be as shown in fig. 7. The computer device includes a processor, a memory, and a network interface connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The database of the computer device is used for storing the preset threshold value. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to realize a power grid monitoring system high-speed memory database access method.
It will be appreciated by those skilled in the art that the configuration shown in fig. 7 is a block diagram of only a portion of the configuration associated with the present application, and is not intended to limit the computing device to which the present application may be applied, and that a particular computing device may include more or fewer components than shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is provided, comprising a memory and a processor, the memory having a computer program stored therein, the processor implementing the following steps when executing the computer program:
(1) if the vehicle is braked by using a retarder and the current torque demand value of the vehicle hits any one target value in a target value set, adding 1 to the first preset number, and calculating the current torque deviation rate of the vehicle, wherein the target value set consists of a preset number of torque demand target values;
(2) if the torque deviation rate is larger than the torque deviation rate threshold value, adding 1 to the second pre-designed quantity;
(3) deleting a target value which is the same as the current value of the torque demand from the target value set;
(4) repeating the processes from (1) to (3) until the first preset counting amount is equal to the preset number, and calculating an average torque deviation rate according to the calculated torque deviation rate at each hit;
(5) if the second preset counting quantity is not greater than the quality judgment threshold, resetting the target value set, the first preset quantity and the second preset quantity, and repeatedly executing the processes from (1) to (4) until the second preset counting quantity is greater than the quality judgment threshold;
and determining the oil liquid quality of the retarder according to the average torque deviation rate finally calculated when the second preset counting amount is larger than the quality judgment threshold.
In one embodiment, the processor when executing the computer program further performs the steps of:
calculating a first torque demand value corresponding to the retarder under the current gear;
calculating a second torque demand value based on a difference between a current actual speed of the vehicle and a target speed set in a cruise control system of the vehicle;
calculating a third torque demand value based on the current actual speed of the vehicle and the target speed set in the constant speed control;
a current torque request value is determined based on the first, second, and third torque requests.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
a maximum value is selected from the first, second and third torque demand values and is used as the current torque demand value.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
and calculating the current actual torque value and the normal torque value of the vehicle, and calculating the current torque deviation rate of the vehicle according to the actual torque value and the normal torque value.
In one embodiment, the actual torque value is calculated by the processor executing the computer program by:
T b ·i g ＝T f +M·a·r+J·α；
wherein, T b Is the actual torque value, T f Is the frictional resistance moment, i g And the speed reduction ratio of the rear axle is r, the radius of the tire is r, the moment of inertia of the transmission shaft is J, and the angular acceleration of the transmission shaft is alpha.
In one embodiment, the normal torque value is obtained by a table prepared from data measured by bench tests, an actual rotating speed and a corresponding relation between the rotating speed and the torque value in the table when the processor executes the computer program.
In one embodiment, the processor, when executing the computer program, calculates the torque deviation ratio by:
S＝(T a -T b )/T a ×100％；
wherein S is a torque deviation ratio, T a Is the normal torque value.
In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of:
(1) if the vehicle is braked by using a retarder and the current torque demand value of the vehicle hits any one target value in a target value set, adding 1 to the first preset number, and calculating the current torque deviation rate of the vehicle, wherein the target value set consists of a preset number of torque demand target values;
(2) if the torque deviation rate is larger than the torque deviation rate threshold value, adding 1 to the second pre-designed quantity;
(3) deleting a target value which is the same as the current value of the torque demand from the target value set;
(4) repeating the processes from (1) to (3) until the first preset counting amount is equal to the preset number, and calculating an average torque deviation rate according to the calculated torque deviation rate at each hit;
(5) if the second preset counting quantity is not greater than the quality judgment threshold, resetting the target value set, the first preset quantity and the second preset quantity, and repeatedly executing the processes from (1) to (4) until the second preset counting quantity is greater than the quality judgment threshold;
and determining the oil liquid quality of the retarder according to the average torque deviation ratio finally calculated when the second preset counting amount is larger than the quality judgment threshold.
In one embodiment, the computer program when executed by the processor further performs the steps of:
calculating a first torque demand value corresponding to the retarder under the current gear;
calculating a second torque demand value based on a difference between a current actual speed of the vehicle and a target speed set in a cruise control system of the vehicle;
calculating a third torque demand value based on the current actual speed of the vehicle and the target speed set in the constant speed control;
a current torque request value is determined based on the first, second, and third torque requests.
In one embodiment, the computer program when executed by the processor further performs the steps of:
a maximum value is selected from the first, second and third torque demand values and is used as the current torque demand value.
In one embodiment, the computer program when executed by the processor further performs the steps of:
and calculating the current actual torque value and the normal torque value of the vehicle, and calculating the current torque deviation rate of the vehicle according to the actual torque value and the normal torque value.
In one embodiment, when the computer program is executed by the processor, the actual torque value is calculated by:
T b ·i g ＝T f +M·a·r+J·α；
wherein, T b Is the actual torque value, T f Is the frictional resistance moment, i g And the speed reduction ratio of the rear axle is r, the radius of the tire is r, the moment of inertia of the transmission shaft is J, and the angular acceleration of the transmission shaft is alpha.
In one embodiment, the normal torque value is derived from a table of data from bench tests, the actual rotational speed, and the corresponding relationship between the rotational speed and the torque value in the table when the computer program is executed by the processor.
In one embodiment, when the computer program is executed by the processor, the torque deviation ratio is calculated by:
S＝(T a -T b )/T a ×100％；
wherein S is a torque deviation ratio, T a Is the normal torque value.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware related to instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method for identifying the quality of oil in a hydrodynamic retarder is characterized by comprising the following steps:
(1) if the vehicle is braked by using a retarder and the current torque demand value of the vehicle hits any one target value in a target value set, adding 1 to a first preset quantity, and calculating the current torque deviation rate of the vehicle, wherein the target value set consists of a preset quantity of torque demand target values;
(2) if the torque deviation rate is larger than the torque deviation rate threshold value, adding 1 to a second pre-designed quantity;
(3) deleting a target value which is the same as the current value of the torque demand from the target value set;
(4) repeating the processes from (1) to (3) until the first preset counting amount is equal to the preset number, and calculating an average torque deviation rate according to the calculated torque deviation rate at each hit;
(5) if the second preset counting quantity is not greater than the quality judgment threshold, resetting the target value set, the first preset number and the second preset number, and repeatedly executing the processes (1) to (4) until the second preset counting quantity is greater than the quality judgment threshold;
and determining the oil liquid quality of the retarder according to the average torque deviation rate finally calculated when the second preset counting amount is larger than the quality judgment threshold.
2. The method of claim 1, wherein calculating the current value of the torque demand comprises:
calculating a first torque demand value corresponding to the retarder under the current gear;
calculating a second torque demand value based on a difference between a current actual speed of the vehicle and a target speed set in a vehicle cruise control system;
calculating a third torque demand value based on the current actual speed of the vehicle and a target speed set in constant speed control;
determining the current torque request value based on the first, second, and third torque requests.
3. The method of claim 2, wherein determining the current torque request value based on the first, second, and third torque request values comprises:
a maximum value is selected from the first, second, and third torque demand values and is used as the current torque demand value.
4. The method of claim 1, wherein said calculating a current torque deviation rate of said vehicle comprises:
and calculating the current actual torque value and the normal torque value of the vehicle, and calculating the current torque deviation rate of the vehicle according to the actual torque value and the normal torque value.
5. The method of claim 4, wherein the calculating of the actual torque value comprises:
T b ·i g ＝T f +M·a·r+J·α；
wherein, T b Is the actual torque value, T f Is the frictional resistance moment, i g And the speed reduction ratio of the rear axle is r, the radius of the tire is r, the moment of inertia of the transmission shaft is J, and the angular acceleration of the transmission shaft is alpha.
6. The method of claim 4, wherein the normal torque value is obtained from a table prepared from data measured by bench test, an actual rotation speed, and a corresponding relationship between the rotation speed and the torque value in the table.
7. The method of claim 4, wherein the calculating of the torque deviation ratio comprises:
S＝(T a -T b )/T a ×100％；
wherein S is a torque deviation ratio, T a Is the normal torque value.
8. The utility model provides an identification means of hydraulic retarber fluid quality which characterized in that, the device includes:
the system comprises a hit module, a first calculation module and a second calculation module, wherein the hit module is used for adding 1 to a first preset quantity and calculating the current torque deviation rate of the vehicle when the vehicle is braked by using a retarder and the current torque demand value of the vehicle hits any one target value in a target value set, and the target value set consists of a preset quantity of torque demand target values;
the comparison module is used for adding 1 to the second pre-designed quantity when the torque deviation rate is larger than a torque deviation rate threshold value;
a deleting module, configured to delete a target value that is the same as the current value of the torque demand from the target value set;
the first circulation module is used for repeatedly executing the processes corresponding to the hit module, the comparison module and the deletion module until the first preset counting amount is equal to the preset number, and calculating an average torque deviation rate according to the calculated torque deviation rate at each hit;
a second cycle module, configured to, when the second preset count is not greater than the quality determination threshold, reset the target value set, the first preset number and the second preset number, and repeatedly execute respective corresponding processes of the hit module, the comparison module, the deletion module and the first cycle module until the second preset count is greater than the quality determination threshold;
and the quality identification module is used for determining the oil liquid quality of the retarder according to the average torque deviation rate finally calculated when the second preset counting amount is larger than the quality judgment threshold.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the method of any of claims 1 to 7.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 7.
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| GB201018520D0 (en) * | 2010-11-03 | 2010-12-15 | Meritor Technology Inc | A braking apparatus for a vehicle and a vehicle comprising said braking apparatus |
| CN203293988U (en) * | 2013-06-27 | 2013-11-20 | 山推工程机械股份有限公司 | Oil on-line detection system for engineering machines |
| CN206269847U (en) * | 2016-08-04 | 2017-06-20 | 西安华越能源科技有限公司 | A kind of vehicle-mounted contamination level of oil liquid measuring system |
| CN106763354A (en) * | 2017-02-09 | 2017-05-31 | 宁夏百辰工业产品设计有限公司 | The Retarder power abatement delayed prevention component of engagement |
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