CN117307688B - Calculation method and device for temperature of hydraulic torque converter and electronic equipment - Google Patents
Calculation method and device for temperature of hydraulic torque converter and electronic equipment Download PDFInfo
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- CN117307688B CN117307688B CN202311608909.0A CN202311608909A CN117307688B CN 117307688 B CN117307688 B CN 117307688B CN 202311608909 A CN202311608909 A CN 202311608909A CN 117307688 B CN117307688 B CN 117307688B
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- 238000004364 calculation method Methods 0.000 title claims abstract description 21
- 230000008859 change Effects 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims description 65
- 238000001816 cooling Methods 0.000 claims description 29
- 230000008569 process Effects 0.000 claims description 19
- 230000017525 heat dissipation Effects 0.000 claims description 18
- 238000004590 computer program Methods 0.000 claims description 15
- 230000005855 radiation Effects 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 description 14
- 239000012530 fluid Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
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- 238000005461 lubrication Methods 0.000 description 2
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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
- F16H—GEARING
- F16H41/00—Rotary fluid gearing of the hydrokinetic type
- F16H41/24—Details
- F16H41/30—Details relating to venting, lubrication, cooling, circulation of the cooling medium
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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
- F16H—GEARING
- F16H41/00—Rotary fluid gearing of the hydrokinetic type
- F16H41/24—Details
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Abstract
The disclosure relates to a calculation method and device of a temperature of a hydraulic torque converter and electronic equipment, and particularly relates to the technical field of vehicles. Comprising the following steps: acquiring the torque of an engine, the rotating speed of the engine, the flow of working oil, the first temperature variation of the working oil and the ambient temperature to calculate the second temperature variation of the hydraulic torque converter; the first temperature change quantity of the working oil is calculated according to the oil temperature of the previous period and the oil temperature of the current period; acquiring a temperature value of the hydraulic torque converter in the last period; and calculating the temperature value of the torque converter in the current period according to the second temperature variation and the temperature value of the torque converter in the previous period. The present disclosure may accurately calculate the temperature of a torque converter.
Description
Technical Field
The disclosure relates to the technical field of vehicles, and in particular relates to a method and a device for calculating the temperature of a hydraulic torque converter and electronic equipment.
Background
The hydraulic torque converter is mainly matched with an automatic transmission to be applied to several important fields of passenger vehicles, commercial vehicles and the like at present, can realize stepless speed change, and brings good and comfortable driving experience to drivers. The hydraulic torque converter mainly comprises a pump wheel, a turbine and a guide wheel and is used for connecting an engine and an automatic transmission. The pump impeller is connected with the engine, and when the engine rotates, the pump impeller can rotate along with the engine, so that the internal oil liquid is driven to rotate along with the pump impeller, and mechanical energy is converted into kinetic energy of liquid. The turbine is connected with the gearbox input shaft, and continuously rotating oil can drive the turbine to rotate, so that power transmission is realized.
The flow of liquid and mechanical friction in the torque converter can generate a large amount of heat energy, and particularly under the condition that a clutch of the torque converter is completely opened, most of work done by a pump impeller is used for heating, the viscosity of oil liquid is reduced, the transmission and lubrication functions are reduced due to the fact that the temperature is too high, abrasion of internal parts and ageing of rubber sealing elements are accelerated, and finally the torque converter is damaged and even mechanical accidents are caused. Thus, there is a need for a method of accurately calculating torque converter temperature.
Disclosure of Invention
In order to solve the technical problems or at least partially solve the technical problems, the disclosure provides a method and a device for calculating the temperature of a hydraulic torque converter, and electronic equipment, which can accurately calculate the temperature of the hydraulic torque converter.
In order to achieve the above object, the technical solution provided by the embodiments of the present disclosure is as follows:
in a first aspect, the present disclosure provides a method of calculating a torque converter temperature, comprising:
acquiring the torque of an engine, the rotating speed of the engine, the flow of working oil, the first temperature variation of the working oil and the ambient temperature to calculate the second temperature variation of the hydraulic torque converter; the first temperature change quantity of the working oil is calculated according to the oil temperature of the previous period and the oil temperature of the current period;
Acquiring a temperature value of the hydraulic torque converter in the last period;
and calculating the temperature value of the torque converter in the current period according to the second temperature variation and the temperature value of the torque converter in the previous period.
As an optional implementation manner of the embodiment of the disclosure, obtaining the engine torque, the engine speed, the working oil flow, the first temperature variation of the working oil, and the ambient temperature to calculate the second temperature variation of the torque converter includes:
calculating work done by a driving wheel of the hydraulic torque converter and work transferred by a driven wheel of the hydraulic torque converter according to the torque and the rotational speed of the engine;
calculating work consumed by the working oil according to the flow of the working oil and the first temperature variation of the working oil;
calculating the power consumed by radiation heat dissipation according to the ambient temperature;
calculating a second temperature variation according to the work done by the driving wheel, the work transmitted by the driven wheel, the work consumed by working oil, the work consumed by radiation heat dissipation and the work consumed by the shell; wherein the work consumed by the working fluid and the work consumed by the housing are related to the second amount of temperature change.
As an alternative implementation of the disclosed embodiments, the work consumed by the working oil includes: work consumed by cooling the oil and work consumed by the internal oil;
According to the working oil flow and the first temperature variation of the working oil, calculating the work consumed by the working oil comprises the following steps:
determining the specific heat capacity of working oil and the density of cooling oil;
calculating the work consumed by the cooling oil according to the specific heat capacity of the working oil, the density of the cooling oil, the flow rate of the working oil, the period duration and the first temperature variation;
and determining the density of the internal oil according to the first temperature variation;
calculating the mass of the internal oil according to the density of the internal oil;
and representing the work consumed by the internal oil according to the specific heat capacity of the working oil, the mass of the internal oil and the second temperature variation.
As an alternative implementation of the embodiments of the present disclosure, the method further includes: receiving a preset signal sent by a hydraulic torque converter, and judging whether the preset signal is valid or not; wherein, the preset signal includes: an oil temperature signal, an engine speed signal, and an input shaft signal;
judging whether the temperature value of the current period is greater than a preset temperature threshold value under the condition that a preset signal is valid;
and under the condition that the temperature value of the hydraulic torque converter in the current period is greater than or equal to a preset temperature threshold value, issuing a control command for limiting the engine torque so as to control the engine to reduce the engine torque.
As an optional implementation manner of the embodiment of the present disclosure, after receiving the preset signal sent by the torque converter and determining whether the preset signal is valid, the method further includes:
and under the condition that the preset signal is invalid, taking the temperature value of the torque converter in the last period as the temperature value of the torque converter in the current period.
As an optional implementation manner of the embodiment of the present disclosure, after receiving the preset signal sent by the torque converter and determining whether the preset signal is valid, the method further includes:
under the condition that a preset signal is valid, comparing the temperature value of the hydraulic torque converter in the current period with the actual temperature value in the historical period, and setting the larger value as the actual temperature value;
under the condition that the actual temperature value is greater than or equal to a preset temperature threshold value, issuing a control command for limiting the engine torque so as to control the engine to reduce the engine torque; and resets the actual temperature value.
As an alternative implementation of the embodiment of the present disclosure, obtaining a temperature value of the torque converter in a last period includes:
judging whether the temperature value of the hydraulic torque converter is calculated for the first time;
if yes, taking the initial temperature of the working oil as the temperature value of the hydraulic torque converter in the last period;
If not, the temperature value of the previous period is obtained.
In a second aspect, the present disclosure provides a torque converter temperature calculation device comprising:
the calculation module is used for acquiring the engine torque, the engine rotating speed, the working oil flow, the first temperature variation of the working oil and the ambient temperature so as to calculate the second temperature variation of the hydraulic torque converter; the first temperature change quantity of the working oil is calculated according to the oil temperature of the previous period and the oil temperature of the current period;
the acquisition module is used for acquiring the temperature value of the hydraulic torque converter in the last period;
the calculation module is also used for calculating the temperature value of the torque converter in the current period according to the second temperature variation and the temperature value of the torque converter in the previous period.
As an optional implementation manner of the disclosed embodiment, the calculating module is specifically configured to, in a process of obtaining the engine torque, the engine speed, the working oil flow, the first temperature variation of the working oil, and the ambient temperature to calculate the second temperature variation of the torque converter:
calculating work done by a driving wheel of the hydraulic torque converter and work transferred by a driven wheel of the hydraulic torque converter according to the torque and the rotational speed of the engine;
Calculating work consumed by the working oil according to the flow of the working oil and the first temperature variation of the working oil;
calculating the power consumed by radiation heat dissipation according to the ambient temperature;
calculating a second temperature variation according to the work done by the driving wheel, the work transmitted by the driven wheel, the work consumed by working oil, the work consumed by radiation heat dissipation and the work consumed by the shell; wherein the work consumed by the working fluid and the work consumed by the housing are related to the second amount of temperature change.
As an alternative implementation of the disclosed embodiments, the work consumed by the working oil includes: work consumed by cooling the oil and work consumed by the internal oil;
the calculation module is specifically used for calculating work consumed by the working oil according to the working oil flow and the first temperature variation of the working oil in the process of calculating the work consumed by the working oil: determining the specific heat capacity of working oil and the density of cooling oil;
calculating the work consumed by the cooling oil according to the specific heat capacity of the working oil, the density of the cooling oil, the flow rate of the working oil, the period duration and the first temperature variation;
and determining the density of the internal oil according to the first temperature variation;
calculating the mass of the internal oil according to the density of the internal oil;
And representing the work consumed by the internal oil according to the specific heat capacity of the working oil, the mass of the internal oil and the second temperature variation.
As an alternative implementation of the embodiment of the disclosure, the computing module is further configured to: receiving a preset signal sent by a hydraulic torque converter, and judging whether the preset signal is valid or not; wherein, the preset signal includes: an oil temperature signal, an engine speed signal, and an input shaft signal;
judging whether the temperature value of the current period is greater than a preset temperature threshold value under the condition that a preset signal is valid;
and under the condition that the temperature value of the hydraulic torque converter in the current period is greater than or equal to a preset temperature threshold value, issuing a control command for limiting the engine torque so as to control the engine to reduce the engine torque.
As an optional implementation manner of the embodiment of the present disclosure, the calculating module is further configured to, after receiving the preset signal sent by the torque converter, determine whether the preset signal is valid, further: and under the condition that the preset signal is invalid, taking the temperature value of the torque converter in the last period as the temperature value of the torque converter in the current period.
As an optional implementation manner of the embodiment of the present disclosure, the calculating module is further configured to, after receiving the preset signal sent by the torque converter, determine whether the preset signal is valid, further:
Under the condition that a preset signal is valid, comparing the temperature value of the hydraulic torque converter in the current period with the actual temperature value in the historical period, and setting the larger value as the actual temperature value;
under the condition that the actual temperature value is greater than or equal to a preset temperature threshold value, issuing a control command for limiting the engine torque so as to control the engine to reduce the engine torque; and resets the actual temperature value.
As an optional implementation manner of the embodiment of the disclosure, the obtaining module is specifically configured to, during a process of obtaining a temperature value of a last cycle of the torque converter: judging whether the temperature value of the hydraulic torque converter is calculated for the first time;
if yes, taking the initial temperature of the working oil as the temperature value of the hydraulic torque converter in the last period;
if not, the temperature value of the previous period is obtained.
In a third aspect, the present disclosure provides an electronic device comprising: a processor, a memory and a computer program stored on the memory and executable on the processor, which when executed by the processor implements the method of calculating torque converter temperature according to the first aspect or any of its alternative embodiments.
In a fourth aspect, the present disclosure provides a computer-readable storage medium comprising: the computer readable storage medium has stored thereon a computer program which, when executed by a processor, implements a method of calculating a torque converter temperature according to the first aspect or any of its alternative embodiments.
In a fifth aspect, there is provided a computer program product comprising: the computer program product, when run on a computer, causes the computer to implement a method of calculating a torque converter temperature as described in the first aspect or any of its alternative embodiments.
Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:
the embodiment of the disclosure provides a calculation method, a device and electronic equipment for temperature of a hydraulic torque converter, wherein the method comprises the steps of firstly obtaining engine torque, engine rotation speed, working oil flow, first temperature variation of working oil and environmental temperature, wherein the first temperature variation of the working oil is the variation of the oil temperature from a previous period to a current period, then calculating second temperature variation of the hydraulic torque converter based on the data to obtain the temperature variation of the hydraulic torque converter from the previous period to the current period, and further obtaining a temperature value of the hydraulic torque converter in the previous period, so as to calculate the temperature value of the hydraulic torque converter in the current period according to the temperature value of the previous period and the second temperature variation. Therefore, the temperature of the hydraulic torque converter is accurately calculated and monitored, and damage to the hydraulic torque converter caused by overhigh temperature can be avoided.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments of the present disclosure or the solutions in the prior art, the drawings that are required for the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic flow chart of a method for calculating torque converter temperature according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a torque converter temperature calculation device according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of an electronic device according to an embodiment of the disclosure.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, a further description of aspects of the present disclosure will be provided below. It should be noted that, without conflict, the embodiments of the present disclosure and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced otherwise than as described herein; it will be apparent that the embodiments in the specification are only some, but not all, embodiments of the disclosure.
The terms "first," second, "" third and the like in the description and in the claims and in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus. The specific meaning of the terms in this disclosure will be understood by those of ordinary skill in the art in the specific context. Furthermore, in the description of the present disclosure, unless otherwise indicated, "a plurality" means two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.
At present, a hydraulic torque converter does not have a reasonable calculation temperature and high-temperature detection strategy, so that oil viscosity reduction, transmission and lubrication function reduction, internal part abrasion, rubber seal aging and even mechanical accidents caused by overhigh temperature often occur.
In order to solve the above problems, the embodiments of the present disclosure provide a method, an apparatus, and an electronic device for calculating a temperature of a torque converter, where the method first obtains an engine torque, an engine speed, a working oil flow, a first temperature variation of the working oil, and an ambient temperature, where the first temperature variation of the working oil is a variation of the oil temperature from a previous cycle to a current cycle, and then calculates a second temperature variation of the torque converter based on the data, to obtain a temperature variation of the torque converter from the previous cycle to the current cycle, and further obtains a temperature value of the torque converter in the previous cycle, so as to calculate a temperature value of the torque converter in the current cycle according to the temperature value of the previous cycle and the second temperature variation. Therefore, the temperature of the hydraulic torque converter is accurately calculated and monitored, and damage to the hydraulic torque converter caused by overhigh temperature can be avoided.
The method for calculating the temperature of the hydraulic torque converter provided by the embodiment of the disclosure can be realized through computer equipment, wherein the computer equipment comprises, but is not limited to, a vehicle terminal, a server, a personal computer, a notebook computer, a tablet computer, a smart phone and the like. The computer device includes a user device and a network device. The user equipment comprises, but is not limited to, a computer, a smart phone, a tablet computer and the like; network devices include, but are not limited to, a single network server, a server group of multiple network servers, or a cloud of large numbers of computers or network servers in a cloud computing, where cloud computing is a type of distributed computing, a super virtual computer consisting of a collection of loosely coupled computers. The computer device may operate alone to implement the present disclosure, or may access a network and implement the present disclosure through interaction with other computer devices in the network. Among them, the network in which the computer device is located includes, but is not limited to, the internet, a wide area network, a metropolitan area network, a local area network, a virtual private (Virtual Private Network, VPN) network, and the like.
It should be noted that, the protection scope of the method for calculating the temperature of the torque converter according to the embodiments of the present disclosure is not limited to the execution sequence of the steps listed in the embodiments, and all the schemes implemented by increasing or decreasing the steps and replacing the steps according to the prior art made according to the principles of the present disclosure are included in the protection scope of the present disclosure.
The method for periodically calculating the temperature of the hydraulic torque converter is characterized in that the temperature change quantity between adjacent periods is calculated, and the temperature value of the current period is accurately calculated by using the temperature value and the temperature change quantity of the previous period.
As shown in fig. 1, fig. 1 is a schematic flow chart of a method for calculating a temperature of a torque converter according to an embodiment of the present disclosure, where the method may be applied to a gearbox controller, and the method includes steps S101 to S103 as follows:
s101, acquiring the engine torque, the engine rotating speed, the working oil flow, the first temperature variation of the working oil and the ambient temperature to calculate the second temperature variation of the hydraulic torque converter.
Wherein engine torque and engine speed are transmitted by the engine to the transmission controller. Working oil flow is monitorable, such as a flow meter, as this disclosure is not particularly limited.
The first temperature change amount of the working oil is calculated according to the oil temperature of the previous cycle and the oil temperature of the current cycle, and exemplarily, the first temperature change amount delta Tz of the working oil=the oil temperature Tz1 of the current cycle to the oil temperature Tz0 of the previous cycle, wherein the units are degrees celsius. The working fluid may be automatic transmission fluid (Automatic Transmission Fluid, ATF) oil.
It should be noted that, the temperature of the working oil is monitorable, and the temperature sensor collects the temperature of the working oil and then transmits a signal to the gearbox controller, which is not described in detail with reference to the present disclosure in the prior art.
In some embodiments, the work performed by the drive wheels of the torque converter is used to: work transmitted by the driven wheel, work consumed by working oil, work consumed by radiation heat dissipation and work consumed by the shell. In the process of executing the step S101 to calculate the second temperature variation, firstly, calculating the work performed by the driving wheel of the torque converter and the work transmitted by the driven wheel of the torque converter according to the engine torque and the engine speed; calculating work consumed by the working oil according to the first temperature variation of the working oil; and calculating the work consumed by radiation heat dissipation according to the ambient temperature, and further calculating a second temperature variation according to the work done by the driving wheel, the work consumed by working oil, the work consumed by radiation heat dissipation and the work consumed by the shell, wherein the work consumed by the working oil and the work consumed by the shell are related to the second temperature variation.
Alternatively, work done by the drive wheels of the torque converter and work transferred by the driven wheels of the torque converter are calculated based on the engine torque and engine speed.
Specifically, work W1 performed by the drive wheel of the torque converter is calculated according to the following formula (1):
（1）
as in formula (1), T1 represents engine torque in nm; n1 is the engine speed in revolutions per minute; t is the period duration in minutes.
The work W2 transmitted by the driven wheel is calculated according to the following formula (2):
（2）
as in equation (2), K represents the transmission torque ratio and i represents the transmission torque ratio.
Wherein the work consumed by the working oil includes work consumed by cooling the oil and work consumed by the internal oil.
In the process of calculating work consumed by working oil according to the flow rate of the working oil and the first temperature variation of the working oil, the specific heat capacity of the working oil and the density of the cooling oil are firstly determined; then calculating the work consumed by the cooling oil according to the specific heat capacity of the working oil, the density of the cooling oil, the flow rate of the working oil, the period duration and the first temperature variation;
alternatively, the work consumed by the cooling oil W3 is calculated according to formula (3):
（3）
as in formula (3), C1 represents the specific heat capacity of the working fluid in units of: joules per kilogram of celsius; ρ is the density of the cooling oil in units of: kilogram/liter, specifically working oil density corresponding to the cooling oil at the initial temperature; q represents working oil flow, unit: liter/second; Δtz is the first temperature change amount of the working oil, Δtz=tz 1 to Tz0, unit: degrees celsius.
In the process of calculating the work consumed by the internal oil in the above embodiment, the internal oil density is first determined according to the first temperature variation, then the internal oil mass is calculated according to the internal oil density, and then the work consumed by the internal oil is represented according to the specific heat capacity of the working oil, the internal oil mass and the second temperature variation. It can be seen that the second temperature change of the torque converter is actually related to the work consumed by the internal oil.
Specifically, the work W4 consumed by the oil inside according to equation (4) can be expressed as:
（4）
as in formula (4), M1 is the mass of working oil in units of: kg; Δt is the temperature variation of the torque converter, and the presently disclosed embodiments are described as a second temperature variation, in units of: degrees celsius. It should be noted that the mass M1 of the working oil is related to the density of the working oil, and the density of the working oil is related to the oil temperature in the current period.
According to formula (5), the work W5 consumed by radiant heat dissipation is calculated:
（5）
as in equation (5), ka is the heat dissipation coefficient, ta is the ambient temperature, T0 is the temperature value of the torque converter in the last cycle, unit: degrees celsius. The work consumed by the radiated heat dissipation is related to the ambient temperature and the temperature value of the torque converter in the last cycle, and the smaller the difference of Ta-T0, the smaller the heat dissipation consumption.
The work consumed by the shell W6 is calculated according to equation (6):
（6）
as in the foregoing formulas (1) - (6), based on the law of conservation of energy, w1=w2+w3+w4+w5+w6 results in the following formula (7) to calculate the second temperature change amount Δt of the torque converter:
（7）
optionally, under the condition of obtaining the engine torque T1, the engine rotation speed N1, the working oil flow Q, the first temperature change Δtz=tz 1-Tz 0 of the working oil, the known period duration T, the transmission torque ratio K, the transmission rotation speed ratio i, the working oil specific heat capacity C1, the working oil density ρ, the heat dissipation coefficient Ka, the ambient temperature Ta, the mass M1 of the working oil, the specific heat capacity C2 of the shell and the mass M2 of the shell, substituting the data into the formula (7) to calculate the second temperature change Δt of the hydraulic torque converter, and it can be understood that the relation between the second temperature change of the hydraulic torque converter and the temperature value of the hydraulic torque converter in the previous period is obtained based on the data substituted into the formula (7).
The above embodiment is different from the related art that the detected temperature of the working oil is directly used as the temperature of the hydraulic torque converter, and the temperature variation of the hydraulic torque converter obtained by the method is the actual temperature variation of the hydraulic torque converter, so that the method is more accurate.
S102, acquiring a temperature value of the torque converter in the last period.
In some embodiments, during the process of obtaining the temperature value of the torque converter in the previous period, firstly judging whether the temperature value of the torque converter is calculated initially, if so, taking the initial temperature of the working oil as the temperature value of the torque converter in the previous period; if not, the temperature value of the previous period is obtained.
Specifically, whether the temperature is calculated for the first time after the automobile is started is judged, if so, the temperature value in the previous period is the initial temperature of the working oil. It will be appreciated that the torque converter has not been formally operating, and that the temperature of the torque converter is actually the initial temperature of the working fluid. If not, the temperature value of the previous cycle can be obtained if the temperature calculation is not the first temperature calculation, and the temperature value of the previous cycle is calculated through steps S101-S103 in the embodiment of the disclosure.
S103, calculating the temperature value of the torque converter in the current period according to the second temperature variation and the temperature value of the torque converter in the previous period.
In some embodiments, the temperature value t1=t0+Δt for the current period, T0 is the temperature value for the torque converter for the last period.
In some embodiments, after performing step S103, the disclosed embodiments further provide an alternative implementation manner: firstly, receiving preset signals transmitted by a hydraulic torque converter, wherein the preset signals comprise an oil temperature signal, an engine rotating speed signal and an input shaft signal, and then judging whether the preset signals are valid or not; judging whether the temperature value of the current period is greater than a preset temperature threshold value under the condition that a preset signal is valid; and under the condition that the temperature value of the current period is greater than or equal to a preset temperature threshold value, issuing a control command for limiting the engine torque so as to control the engine to reduce the engine torque.
Wherein the validity diagnosis of the preset signal may be performed based on a validity diagnosis policy of the preset signal. The preset temperature threshold is a preset threshold for measuring whether the temperature of the torque converter is too high.
Specifically, after the temperature value of the hydraulic torque converter in the current period is obtained through calculation, the gearbox controller judges whether the received oil temperature signal sent by the hydraulic torque converter is effective or not, if so, whether the received engine rotating speed signal is effective or not is judged; if yes, judging whether the received input shaft signal is effective, and if yes, accurately and effectively indicating the calculated temperature value of the current period of the hydraulic torque converter. And comparing the temperature value of the hydraulic torque converter in the current period with a preset temperature threshold value, judging whether the temperature value is larger than the preset temperature threshold value, if so, indicating that the temperature value of the hydraulic torque converter in the current period is too high, and if so, sending a control command to an engine to reduce the torque of the engine so as to reduce the temperature.
In other embodiments, when the preset signal is valid, comparing the temperature value of the torque converter in the current period with the actual temperature value in the historical period, and setting the larger value as the actual temperature value; and under the condition that the actual temperature value is greater than or equal to a preset temperature threshold value, issuing a control command for limiting the engine torque so as to control the engine to reduce the engine torque and resetting the actual temperature value. Optionally, in the case that the temperature value in the current period is smaller than the actual temperature value, resetting the actual temperature value to be the temperature value of the torque converter in the current period.
Specifically, under the condition that the preset signal is valid, that is, the oil temperature signal, the engine rotation speed signal and the input shaft signal are all valid, comparing the temperature value of the hydraulic torque converter in the current period calculated in the step S103 with the actual temperature value in the history period; if the temperature value of the current period is larger than the actual temperature value of the historical period, the temperature value of the current period is set to be an actual temperature value, whether the actual temperature value is larger than or equal to a preset temperature threshold value or not is further compared, whether the actual temperature of the hydraulic torque converter is too high or not is measured, if yes, a control instruction is sent to an engine to control the engine to reduce the torque of the engine, cooling is achieved, the temperature of the hydraulic torque converter is recalculated after cooling, and the actual temperature value is reset to be used for comparison of the next period. If the temperature value of the current period is smaller than the actual temperature value of the historical period, the actual temperature value of the historical period is taken as the actual temperature of the hydraulic torque converter, and it can be understood that the actual temperature value of the historical period may be the temperature corresponding to the actual temperature value after torque limitation, and if the actual temperature value is larger than or equal to the preset temperature threshold, the actual temperature of the hydraulic torque converter after torque limitation is indicated to be too high, a control instruction for torque limitation is further issued to the engine so as to reduce the torque of the engine. Until the actual temperature value is less than the preset temperature threshold.
For example, in the case where the oil temperature signal, the engine rotation speed signal, and the input shaft signal are all valid, it is assumed that the temperature value in the current period is calculated as T, and the actual temperature value in the history period is Tmax, so that the larger one of the two is taken as the actual temperature value tmax=max (T, tmax), and then it is determined whether Tmax is greater than or equal to the preset temperature threshold value, if so, a control instruction for limiting torque is issued to the engine, and the torque of the engine is reduced. Further, the actual temperature value is reset.
On the basis of the above embodiment, in the case where the preset signal is invalid, the temperature value of the previous cycle is taken as the temperature value of the current cycle, specifically, in the case where any one of the oil temperature signal, the engine rotation speed signal and the input shaft signal is invalid, the calculated temperature value is inaccurate, and the temperature value of the torque converter of the previous cycle is used. And then comparing the temperature with a preset temperature threshold value to judge whether to issue a control instruction to the engine.
The embodiment firstly determines whether the calculated temperature value of the hydraulic torque converter in the current period is accurate or not through whether the preset signal is valid or not; in the case of accurate determination, the maximum temperature of the torque converter, that is, the greater of the temperature value of the current cycle and the temperature value of the history cycle is recorded, so that the engine torque is limited in the case where the maximum temperature is greater than or equal to a preset temperature threshold value, thereby preventing the torque converter from being damaged due to the excessively high temperature.
In summary, an embodiment of the present disclosure provides a method for calculating a torque converter, which includes first obtaining an engine torque, an engine speed, a working oil flow, a first temperature variation of the working oil, and an ambient temperature, where the first temperature variation of the working oil is a variation of an oil temperature from a previous cycle to a current cycle, and then calculating a second temperature variation of the torque converter based on the data to obtain a temperature variation of the torque converter from the previous cycle to the current cycle, and further obtaining a temperature value of the torque converter in the previous cycle, so as to calculate a temperature value of the torque converter in the current cycle according to the temperature value of the previous cycle and the second temperature variation. Therefore, the temperature of the hydraulic torque converter is accurately calculated and monitored, and damage to the hydraulic torque converter caused by overhigh temperature can be avoided.
As shown in fig. 2, fig. 2 is a schematic structural diagram of a torque converter temperature calculating device according to an embodiment of the present disclosure, where the device includes:
a calculation module 201, configured to obtain an engine torque, an engine speed, a working oil flow, a first temperature variation of the working oil, and an ambient temperature, so as to calculate a second temperature variation of the torque converter; the first temperature change quantity of the working oil is calculated according to the oil temperature of the previous period and the oil temperature of the current period;
An acquisition module 202, configured to acquire a temperature value of the torque converter in a previous period;
the calculation module 201 is further configured to calculate a temperature value of the torque converter in a current period according to the second temperature variation and the temperature value of the torque converter in a previous period.
As an optional implementation manner of the embodiment of the present disclosure, the calculating module 201 is specifically configured to, in a process of obtaining the engine torque, the engine speed, the working oil flow, the first temperature variation of the working oil, and the ambient temperature to calculate the second temperature variation of the torque converter:
calculating work done by a driving wheel of the hydraulic torque converter and work transferred by a driven wheel of the hydraulic torque converter according to the torque and the rotational speed of the engine; calculating work consumed by the working oil according to the flow of the working oil and the first temperature variation of the working oil; calculating the power consumed by radiation heat dissipation according to the ambient temperature; calculating a second temperature variation according to the work done by the driving wheel, the work transmitted by the driven wheel, the work consumed by working oil, the work consumed by radiation heat dissipation and the work consumed by the shell; wherein the work consumed by the working fluid and the work consumed by the housing are related to the second amount of temperature change.
As an alternative implementation of the disclosed embodiments, the work consumed by the working oil includes: work consumed by cooling the oil and work consumed by the internal oil; the calculation module 201 is specifically configured to, in a process of calculating work consumed by the working oil according to the working oil flow and the first temperature variation of the working oil:
determining the specific heat capacity of working oil and the density of cooling oil; calculating the work consumed by the cooling oil according to the specific heat capacity of the working oil, the density of the cooling oil, the flow rate of the working oil, the period duration and the first temperature variation; and determining the density of the internal oil according to the first temperature variation; calculating the mass of the internal oil according to the density of the internal oil; and representing the work consumed by the internal oil according to the specific heat capacity of the working oil, the mass of the internal oil and the second temperature variation.
As an alternative implementation of the disclosed embodiments, the computing module 201 is further configured to: receiving a preset signal sent by a hydraulic torque converter, and judging whether the preset signal is valid or not; wherein, the preset signal includes: an oil temperature signal, an engine speed signal, and an input shaft signal; judging whether the temperature value of the current period is greater than a preset temperature threshold value under the condition that a preset signal is valid; and under the condition that the temperature value of the hydraulic torque converter in the current period is greater than or equal to a preset temperature threshold value, issuing a control command for limiting the engine torque so as to control the engine to reduce the engine torque.
As an optional implementation manner of the embodiment of the present disclosure, after receiving the preset signal sent by the torque converter, the calculating module 201 is further configured to: and under the condition that the preset signal is invalid, taking the temperature value of the torque converter in the last period as the temperature value of the torque converter in the current period.
As an optional implementation manner of the embodiment of the present disclosure, after receiving the preset signal sent by the torque converter, the calculating module 201 is further configured to:
under the condition that a preset signal is valid, comparing the temperature value of the hydraulic torque converter in the current period with the actual temperature value in the historical period, and setting the larger value as the actual temperature value; under the condition that the actual temperature value is greater than or equal to a preset temperature threshold value, issuing a control command for limiting the engine torque so as to control the engine to reduce the engine torque; and resets the actual temperature value.
As an optional implementation manner of the embodiment of the disclosure, the obtaining module 202 is specifically configured to, during the process of obtaining the temperature value of the torque converter in the last cycle: judging whether the temperature value of the hydraulic torque converter is calculated for the first time; if yes, taking the initial temperature of the working oil as the temperature value of the hydraulic torque converter in the last period; if not, the temperature value of the previous period is obtained.
As shown in fig. 3, fig. 3 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure, where the electronic device includes: a processor 301, a memory 302 and a computer program stored on the memory 302 and executable on the processor 301, which when executed by the processor 301, implements the respective processes of the torque converter temperature calculation method in the method embodiment described above. And the same technical effects can be achieved, and in order to avoid repetition, the description is omitted here.
The embodiments of the present disclosure provide a computer readable storage medium, on which a computer program is stored, which when executed by a processor, implements each process of the method for calculating a temperature of a torque converter in the foregoing method embodiment, and can achieve the same technical effects, so that repetition is avoided, and no further description is given here.
The computer readable storage medium may be a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, an optical disk, or the like.
The embodiments of the present disclosure provide a computer program product, where the computer program product stores a computer program, and when the computer program is executed by a processor, the computer program realizes each process of the method for calculating the temperature of the torque converter in the embodiment of the method, and can achieve the same technical effect, so that repetition is avoided, and no description is repeated here.
It will be appreciated by those skilled in the art that embodiments of the present disclosure may be provided as a method, system, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more computer-usable storage media having computer-usable program code embodied therein.
In this disclosure, the processor may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
In the present disclosure, memory may include volatile memory, random Access Memory (RAM), and/or nonvolatile memory, such as Read Only Memory (ROM) or flash RAM, in a computer readable medium. Memory is an example of a computer-readable medium.
In the present disclosure, computer readable media include both permanent and non-permanent, removable and non-removable storage media. Storage media may embody any method or technology for storage of information, which may be computer readable instructions, data structures, program modules, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Disks (DVD) or other optical storage, magnetic cassettes, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
The above is merely a specific embodiment of the disclosure to enable one skilled in the art to understand or practice the disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A method of calculating a torque converter temperature, comprising:
acquiring the torque of an engine, the rotating speed of the engine, the flow of working oil, the first temperature variation of the working oil and the ambient temperature to calculate the second temperature variation of the hydraulic torque converter; the first temperature change quantity of the working oil is calculated according to the oil temperature of the previous period and the oil temperature of the current period;
acquiring a temperature value of the hydraulic torque converter in a previous period;
calculating the temperature value of the hydraulic torque converter in the current period according to the second temperature variation and the temperature value of the hydraulic torque converter in the previous period;
The method for obtaining the first temperature variation of the engine torque, the engine rotating speed, the working oil flow, the working oil and the environment temperature to calculate the second temperature variation of the hydraulic torque converter comprises the following steps:
calculating work done by a driving wheel of the hydraulic torque converter and work transferred by a driven wheel of the hydraulic torque converter according to the engine torque and the engine rotating speed;
calculating the work consumed by the working oil according to the working oil flow and the first temperature variation of the working oil;
calculating the power consumed by radiation heat dissipation according to the ambient temperature;
calculating the second temperature variation according to the work done by the driving wheel, the work transmitted by the driven wheel, the work consumed by the working oil, the work consumed by the radiation heat dissipation and the work consumed by the shell; wherein work consumed by working oil and work consumed by the housing is related to the second amount of temperature change;
wherein, work consumed by the working oil liquid comprises: work consumed by cooling the oil and work consumed by the internal oil;
the calculating work consumed by the working oil according to the working oil flow and the first temperature variation of the working oil comprises the following steps:
Determining the specific heat capacity of working oil and the density of cooling oil;
calculating work consumed by the cooling oil according to the specific heat capacity of the working oil, the density of the cooling oil, the flow rate of the working oil, the period duration and the first temperature variation;
and determining the density of the internal oil according to the first temperature variation;
calculating the mass of the internal oil according to the density of the internal oil;
and characterizing the work consumed by the internal oil according to the specific heat capacity of the working oil, the mass of the internal oil and the second temperature variation.
2. The method according to claim 1, wherein the method further comprises:
receiving a preset signal sent by the hydraulic torque converter, and judging whether the preset signal is valid or not; wherein, the preset signal includes: an oil temperature signal, an engine speed signal, and an input shaft signal;
judging whether the temperature value of the current period is greater than a preset temperature threshold value or not under the condition that the preset signal is valid;
and under the condition that the temperature value of the hydraulic torque converter in the current period is greater than or equal to the preset temperature threshold value, issuing a control command for limiting the engine torque so as to control the engine to reduce the engine torque.
3. The method of claim 2, wherein after receiving the preset signal sent by the torque converter and determining whether the preset signal is valid, the method further comprises:
and under the condition that the preset signal is invalid, taking the temperature value of the hydraulic torque converter in the last period as the temperature value of the hydraulic torque converter in the current period.
4. The method of claim 2, wherein after receiving the preset signal sent by the torque converter and determining whether the preset signal is valid, the method further comprises:
comparing the temperature value of the hydraulic torque converter in the current period with the actual temperature value in the historical period under the condition that the preset signal is valid, and setting the larger value as the actual temperature value;
issuing a control command for limiting the engine torque to control the engine to reduce the engine torque when the actual temperature value is greater than or equal to the preset temperature threshold value; and resets the actual temperature value.
5. The method of claim 1, wherein the obtaining a temperature value of the torque converter for a last cycle comprises:
Judging whether the temperature value of the hydraulic torque converter is calculated for the first time;
if yes, taking the initial temperature of the working oil as a temperature value of the hydraulic torque converter in the last period;
if not, the temperature value of the previous period is obtained.
6. A torque converter temperature calculation device, comprising:
the calculation module is used for acquiring the engine torque, the engine rotating speed, the working oil flow, the first temperature variation of the working oil and the ambient temperature so as to calculate the second temperature variation of the hydraulic torque converter; the first temperature change quantity of the working oil is calculated according to the oil temperature of the previous period and the oil temperature of the current period;
the acquisition module is used for acquiring the temperature value of the hydraulic torque converter in the last period;
the calculation module is also used for calculating the temperature value of the hydraulic torque converter in the current period according to the second temperature variation and the temperature value of the hydraulic torque converter in the last period;
the computing module is specifically configured to: calculating work done by a driving wheel of the hydraulic torque converter and work transferred by a driven wheel of the hydraulic torque converter according to the engine torque and the engine rotating speed;
Calculating the work consumed by the working oil according to the working oil flow and the first temperature variation of the working oil;
calculating the power consumed by radiation heat dissipation according to the ambient temperature;
calculating the second temperature variation according to the work done by the driving wheel, the work transmitted by the driven wheel, the work consumed by the working oil, the work consumed by the radiation heat dissipation and the work consumed by the shell; wherein work consumed by working oil and work consumed by the housing is related to the second amount of temperature change;
wherein, work consumed by the working oil liquid comprises: work consumed by cooling the oil and work consumed by the internal oil;
the calculation module is specifically configured to, in a process of calculating work consumed by the working oil according to the working oil flow and the first temperature variation of the working oil:
determining the specific heat capacity of working oil and the density of cooling oil;
calculating work consumed by the cooling oil according to the specific heat capacity of the working oil, the density of the cooling oil, the flow rate of the working oil, the period duration and the first temperature variation;
and determining the density of the internal oil according to the first temperature variation;
Calculating the mass of the internal oil according to the density of the internal oil;
and characterizing the work consumed by the internal oil according to the specific heat capacity of the working oil, the mass of the internal oil and the second temperature variation.
7. An electronic device, comprising: a processor, a memory and a computer program stored on the memory and executable on the processor, which when executed by the processor implements the method of calculating a torque converter temperature according to any one of claims 1 to 5.
8. A computer-readable storage medium, comprising: the computer-readable storage medium stores thereon a computer program which, when executed by a processor, implements the method of calculating a torque converter temperature according to any one of claims 1 to 5.
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