CN112065966B - Transmission thermal management control method - Google Patents
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- CN112065966B CN112065966B CN202010900447.XA CN202010900447A CN112065966B CN 112065966 B CN112065966 B CN 112065966B CN 202010900447 A CN202010900447 A CN 202010900447A CN 112065966 B CN112065966 B CN 112065966B
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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
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0412—Cooling or heating; Control of temperature
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Abstract
The invention relates to the field of transmissions and discloses a transmission thermal management control method. Obtaining an oil temperature T of a transmissionnCalculating the heat generation quantity S of the transmission in a preset time periodnSetting TLAnd THSetting n for two oil temperature thresholds of a transmission1Setting S for oil temperature safety coefficient of transmissiona、Sb、ScAnd SdFour heat production threshold values with numerical values from small to large are sequentially arranged; when T isn≤TLWhen the cooling liquid is in the cooling liquid loop, the switch valve of the cooling liquid loop is closed; when T isL＜Tn≤n1*THAnd S isn≤SaAt this time, the on-off valve of the coolant circuit is closed. According to the transmission thermal management control method, the heating value of the transmission is calculated according to the running state of the whole vehicle, the cooling strategy of the transmission is determined based on the heating value calculation result and the transmission oil temperature, the heat dissipation effect is good, and the delay of the transmission heating value measurement is low.
Description
Technical Field
The invention relates to the field of transmissions, in particular to a transmission thermal management control method.
Background
The dual clutch automatic transmission is provided with two separated clutches and two separated input shafts, and when the clutches are engaged, the torque and the rotating speed of an engine are transmitted to the input shafts, so that power transmission is realized. The clutch has sliding friction during the combining process and when the clutch transmits power after combining, and heat can be generated. Transmission shaft teeth also generate heat when transmitting power. Excessive heat generation may cause excessive internal transmission temperatures and impaired transmission function, and may even result in clutch plate ablation and transmission damage. In addition, the transmission internal temperature is too low, which reduces the efficiency of the transmission.
In order to operate the transmission at an optimum level, the temperature inside the transmission is regulated, and the transmission oil needs to be cooled or heated to a certain temperature range. The cooling of current car to the derailleur generally adopts the water-cooling scheme, installs the oil cooler on the car, makes coolant liquid and derailleur oil realize the heat exchange in the oil cooler, and the heat of a part of derailleur oil is taken away to the coolant liquid, realizes the cooling to the derailleur oil, and then realizes cooling to the derailleur. The current transmission heat dissipation control strategy is mostly controlled based on the transmission oil temperature, and because the transmission oil is an inventory and the heat generated by the transmission is reflected to the change of the transmission oil temperature, a certain time is required, the control mode has large delay on the measurement of the heat productivity of the transmission, so that the heat dissipation effect is poor.
Disclosure of Invention
Based on the above problems, an object of the present invention is to provide a transmission thermal management control method, which has a good heat dissipation effect and a low delay in transmission heat generation amount measurement.
In order to achieve the purpose, the invention adopts the following technical scheme:
a transmission thermal management control method comprising:
obtaining an oil temperature T of a transmissionnCalculating the heat generation quantity S of the transmission in a preset time periodnSetting TLAnd THSetting n for two oil temperature thresholds of a transmission1Setting S for oil temperature safety coefficient of transmissiona、Sb、ScAnd SdFour heat production threshold values with numerical values from small to large are sequentially arranged;
when T isn＜TLWhen the cooling liquid is in the cooling liquid loop, the switch valve of the cooling liquid loop is closed;
when T isL≤Tn＜n1*THAnd S isn＜SaWhen the cooling liquid is in the cooling liquid loop, the switch valve of the cooling liquid loop is closed;
when T isL≤Tn＜n1*THAnd S isa≤Sn＜SbWhen the opening and closing valve of the cooling liquid loop is opened, the flow dividing valve maintains the initial flow dividing proportion；
When T isL≤Tn＜n1*THAnd S isb≤Sn＜ScWhen the cooling liquid is cooled, the on-off valve of the cooling liquid loop is opened, the flow dividing ratio of the flow dividing valve is changed, the flow rate of the cooling liquid is increased, and the increase value of the flow rate of the cooling liquid is equal to (S)n-Sb)/(Sc-Sb) The numerical values are in direct proportion;
when T isL≤Tn＜n1*THAnd S isn≥ScWhen the cooling circuit is opened, the switch valve of the cooling circuit is opened, the splitter valve distributes the maximum cooling liquid flow for the cooling circuit of the speed changer, the oil flow of the speed changer is increased, and the increase value of the oil flow of the speed changer is equal to (S)n-Sc)/(Sd-Sc) The numerical values are in direct proportion;
when n is1*TH≤Tn＜THWhen the cooling system is started, the switch valve of the cooling liquid loop is opened, the shunt valve distributes the maximum cooling liquid flow for the transmission cooling loop, the transmission oil pump provides the maximum transmission oil flow for the oil cooler, and the cooling fan of the cooling liquid loop is started;
when T isn≥THWhen the clutch is in a closed state, the switch valve of the cooling liquid loop is opened, the shunt valve distributes the maximum cooling liquid flow for the transmission cooling loop, the transmission oil pump provides the maximum transmission oil flow for the oil cooler, the cooling fan of the cooling liquid loop is started, and the clutch is forcibly separated.
As a preferable aspect of the transmission thermal management control method of the invention, the heat generation amount of the transmission includes a clutch heat generation amount, a bearing heat generation amount, and a gear heat generation amount.
As a preferable scheme of the transmission thermal management control method, the input torque of the clutch is obtained according to engine calibration data, the friction work of the clutch is calculated according to the rotating speed of the driving end and the rotating speed of the driven end of the clutch and the transmission torque value of the clutch, and a clutch heat production model is obtained.
As a preferred scheme of the transmission thermal management control method, the gear heat production comprises friction power loss and oil mixing power loss, the friction power loss is obtained by establishing a gear model for calculation, the oil mixing power loss is calculated by an empirical formula, and a gear heat production model is obtained by integrating the friction power loss and the oil mixing power loss.
As a preferable scheme of the transmission thermal management control method, the bearing heat production quantity comprises a load-related heat production quantity and a load-unrelated oil stirring heat production quantity, a bearing heat production model is obtained through building bearing model calculation, and a gear heat production model and a bearing heat production model are integrated to obtain an axle tooth heat production model.
As a preferred scheme of the transmission thermal management control method, the method comprises the steps of performing bench verification on a shaft tooth heat production model, closing cooling of an oil cooler, recording a relation curve between time and transmission oil temperature when the transmission is connected into different gears at different input rotating speeds and when the clutch transmits different torques, wherein under the working condition, a transmission heat production source generates heat for the shaft tooth, the heat dissipation mode is shell heat dissipation, and a relation table corresponding to the shaft tooth heat production is obtained by combining a shell heat dissipation model under the working conditions of different input rotating speeds, different gears and different clutches transmitting torques, so that the shaft tooth heat production model is corrected.
The optimal scheme of the transmission heat management control method is that a clutch heat production model is subjected to bench verification, oil cooler cooling is turned off, when different input rotating speeds and different torques are transmitted by the clutch, a relation curve between time and transmission oil temperature is recorded, under the working condition, a transmission heat production source comprises shaft tooth heat production and clutch sliding friction heat production in a gear shifting process, heat dissipation is conducted on a shell in a shell heat dissipation mode, under the working conditions of different input rotating speeds and different clutch transmission torques, a corresponding clutch heat production relation table is obtained by combining the shell heat dissipation model and the shaft tooth heat production model, a clutch heat production model is corrected, the corrected shaft tooth heat production model and the clutch heat production model are comprehensively obtained, and the transmission heat production model is obtained by superposition, Sa、Sb、ScAnd SdAnd selecting according to the bench verification test data.
In a preferred embodiment of the thermal management control method of the transmission according to the present invention, the transmission torque of the clutch, the input rotation speed of the clutch, and the output rotation speed of the clutch among the input parameters of the heat generation model of the transmission are obtained from torque data of the engine and a rotation speed sensor integrated with the transmission.
The transmission heat management control method is a preferable scheme of reading the transmission torque of the clutch, the input end rotating speed and the output end rotating speed of the clutch, and calculating the information of the gear shifting position of the transmission, the service time of each gear and the transmission torque value of the corresponding time in the preset time period.
As a preferable mode of the transmission thermal management control method of the invention, n1The value of (a) is in the range of 0.8 to 0.9.
The invention has the beneficial effects that:
the invention provides a transmission thermal management control method, which is used for obtaining the oil temperature T of a transmissionnCalculating the heat generation quantity S of the transmission in a preset time periodnSetting TLAnd THSetting n for two oil temperature thresholds of a transmission1Setting S for oil temperature safety coefficient of transmissiona、Sb、ScAnd SdFour heat production threshold values with numerical values from small to large are sequentially arranged; when T isn＜TLWhen the cooling liquid is in the cooling liquid loop, the switch valve of the cooling liquid loop is closed; when T isL≤Tn＜n1*THAnd S isn＜SaWhen the cooling liquid is in the cooling liquid loop, the switch valve of the cooling liquid loop is closed; when T isL≤Tn＜n1*THAnd S isa≤Sn＜SbWhen the cooling liquid is cooled, the switch valve of the cooling liquid loop is opened, and the shunt valve keeps the initial shunt proportion; when T isL≤Tn＜n1*THAnd S isb≤Sn＜ScWhen the cooling liquid is cooled, the on-off valve of the cooling liquid loop is opened, the flow dividing ratio of the flow dividing valve is changed, the flow rate of the cooling liquid is increased, and the increase value of the flow rate of the cooling liquid is equal to (S)n-Sb)/(Sc-Sb) The numerical values are in direct proportion; when T isL≤Tn＜n1*THAnd S isn≥ScWhen the cooling circuit is opened, the switch valve of the cooling circuit is opened, the splitter valve distributes the maximum cooling liquid flow for the cooling circuit of the speed changer, the oil flow of the speed changer is increased, and the increase value of the oil flow of the speed changer is equal to (S)n-Sc)/(Sd-Sc) The numerical values are in direct proportion; when n is1*TH≤Tn＜THWhen the cooling system is started, the switch valve of the cooling liquid loop is opened, the shunt valve distributes the maximum cooling liquid flow for the transmission cooling loop, the transmission oil pump provides the maximum transmission oil flow for the oil cooler, and the cooling fan of the cooling liquid loop is started; when T isn≥THWhen the clutch is in a closed state, the switch valve of the cooling liquid loop is opened, the shunt valve distributes the maximum cooling liquid flow for the transmission cooling loop, the transmission oil pump provides the maximum transmission oil flow for the oil cooler, the cooling fan of the cooling liquid loop is started, and the clutch is forcibly separated. According to the transmission thermal management control method, the heating value of the transmission is calculated according to the running state of the whole vehicle, the cooling strategy of the transmission is determined based on the heating value calculation result and the transmission oil temperature, the heat dissipation effect is good, and the delay of the transmission heating value measurement is low.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
FIG. 1 is a schematic flow chart diagram of a transmission thermal management control method according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a transmission dissipating heat through an oil cooler according to an embodiment of the present invention.
In the figure:
1-an oil cooler; 2-a transmission; 3-a transmission control unit; 4-a whole vehicle electronic control unit; 5-speed variator
An oil circuit; 6-cooling liquid loop;
51-transmission oil pump;
61-a mechanical pump; 62-a diverter valve; 63-a switching valve; 64-radiator fan.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, the present embodiment provides a transmission thermal management control method including:
obtaining an oil temperature T of a transmissionnCalculating the heat generation quantity S of the transmission in a preset time periodnSetting TLAnd THSetting n for two oil temperature thresholds of a transmission1Setting S for oil temperature safety coefficient of transmissiona、Sb、ScAnd SdFour heat production threshold values with numerical values from small to large are sequentially arranged;
when T isn＜TLWhen the cooling liquid is in the cooling liquid loop, the switch valve of the cooling liquid loop is closed;
when T isL≤Tn＜n1*THAnd S isn＜SaWhen the cooling liquid is in the cooling liquid loop, the switch valve of the cooling liquid loop is closed;
when T isL≤Tn＜n1*THAnd S isa≤Sn＜SbWhen the cooling liquid is cooled, the switch valve of the cooling liquid loop is opened, and the shunt valve keeps the initial shunt proportion;
when T isL≤Tn＜n1*THAnd S isb≤Sn＜ScWhen the cooling liquid is cooled, the on-off valve of the cooling liquid loop is opened, the flow dividing ratio of the flow dividing valve is changed, the flow rate of the cooling liquid is increased, and the increase value of the flow rate of the cooling liquid is equal to (S)n-Sb)/(Sc-Sb) The numerical values are in direct proportion;
when T isL≤Tn＜n1*THAnd S isn≥ScWhen the cooling circuit is opened, the switch valve of the cooling circuit is opened, the splitter valve distributes the maximum cooling liquid flow for the cooling circuit of the speed changer, the oil flow of the speed changer is increased, and the increase value of the oil flow of the speed changer is equal to (S)n-Sc)/(Sd-Sc) The numerical values are in direct proportion;
when n is1*TH≤Tn＜THWhen the cooling system is started, the switch valve of the cooling liquid loop is opened, the shunt valve distributes the maximum cooling liquid flow for the transmission cooling loop, the transmission oil pump provides the maximum transmission oil flow for the oil cooler, and the cooling fan of the cooling liquid loop is started;
when T isn≥THWhen the clutch is in a closed state, the switch valve of the cooling liquid loop is opened, the shunt valve distributes the maximum cooling liquid flow for the transmission cooling loop, the transmission oil pump provides the maximum transmission oil flow for the oil cooler, the cooling fan of the cooling liquid loop is started, and the clutch is forcibly separated.
Wherein the control target: 1. the oil temperature measured by a temperature sensor in the transmission is not more than Tmax(ii) a 2. When the oil temperature exceeds n1*TmaxAt t, ataThe oil temperature can be reduced to n within the time1*TmaxThe following. (provided with n)1For the oil temperature safety factor of the gearbox, n in the embodiment1＝0.85)。
And (3) control input: by reading the input rotating speed of the clutch, the output rotating speed of the clutch and the transmission torque value of the clutch in the TCU, the service time of each gear of the transmission and the corresponding time transmission torque value in a certain period of time can be calculated, and the gear switching condition of the transmission can also be calculated.
The control object is: the flow of the cooling liquid is controlled by a cooling liquid switch valve and a cooling liquid shunt valve; controlling the temperature of the cooling liquid through a cooling liquid loop cooling fan; transmission oil flow is controlled by an in-transmission oil pump.
Setting a fixed time step length as tbApplying the heat generation model, the current time point is t0To calculate a certain time period t0-tb,t0]The heat generation amount S of the inner transmission. Every tbTime, calculating t before the current time pointbThe heat productivity of the transmission within time is calculated in real time, and the heat productivity is used as a parameter for determining the control strategy of the oil cooler. To reduce control delay, tbThe length is not suitable to be too long; considering that the number of shifts within a fixed period of time is to be detected, the shifting process requires a certain time, tbShould not be too short; t is tbShould be less than taIdeal case taThe value should be set to tbSeveral times higher.
The oil cooler heat dissipation leads to the heat dissipation mode that belongs to the initiative, can realize the initiative management to the derailleur oil cooling. Fig. 2 is a schematic diagram of the transmission dissipating heat through an oil cooler, wherein the entire vehicle electronic control unit 4 and the transmission control unit 3 realize data exchange through a CAN bus. There are two hydraulic circuits in the figure: a transmission oil circuit 5 and a coolant circuit 6. The pressure source of the transmission oil loop 5 is a transmission oil pump 51 driven by the transmission 2, the transmission oil enters the oil cooler 1 to exchange heat with the cooling liquid, and the cooled transmission oil flows back to the transmission 2 to cool the transmission body; the pressure source of the cooling liquid loop 6 is a mechanical pump 61 driven by an engine, the cooling liquid loop 6 is provided with a switch valve 63 for controlling whether the cooling liquid enters the oil cooler 1, the cooling liquid loop 6 is additionally provided with a flow dividing valve 62 for adjusting the flow of the cooling liquid entering the cooling liquid loop 6, and the cooling liquid loop 6 is also provided with a cooling fan 64 for cooling the cooling liquid. The coolant exchanges heat with the transmission oil in the oil cooler 1, and the coolant removes a portion of the heat of the transmission oil. The cooling capacity of the oil cooler 1 to the transmission oil in unit time can be changed by controlling the flow of the cooling liquid and the transmission oil entering the oil cooler 1 or cooling the cooling liquid.
Since the heat generation source of the transmission mainly includes the clutch, the bearing, and the gear, the heat generation amount of the transmission may alternatively include the clutch heat generation amount, the bearing heat generation amount, and the gear heat generation amount.
Optionally, the input torque of the clutch is obtained according to engine calibration data, and the friction work of the clutch is calculated according to the rotating speed of the driving end and the rotating speed of the driven end of the clutch and the transmission torque value of the clutch, so as to obtain a clutch heat production model.
In order to obtain a gear heat production model, optionally, the gear heat production quantity comprises friction power loss and oil churning power loss, the friction power loss is obtained by establishing a gear model calculation, the oil churning power loss is calculated by an empirical formula, and the gear heat production model is obtained by integrating the friction power loss and the oil churning power loss.
In order to obtain an axle tooth heat generation model, optionally, the bearing heat generation amount comprises a load-related heat generation amount and a load-unrelated oil churning heat generation amount, a bearing heat generation model is obtained by establishing a bearing model calculation, and the axle tooth heat generation model is obtained by integrating a gear heat generation model and the bearing heat generation model.
Optionally, the rack verification is carried out on the shaft tooth heat generation model, cooling of an oil cooler is turned off, when the transmission is hung in different gears at different input rotating speeds and different torques are transmitted by the clutch, a relation curve between time and the oil temperature of the transmission is recorded, under the working condition, a heat generation source of the transmission generates heat for the shaft tooth, the heat dissipation mode is shell heat dissipation, and a relation table corresponding to the heat generation quantity of the shaft tooth is obtained by combining a shell heat dissipation model under the working conditions of different input rotating speeds, different gears and different torques transmitted by the clutch, so that the heat generation model of the shaft tooth is corrected.
In order to correct the clutch heat production model, optionally, bench verification is carried out on the clutch heat production model, cooling of an oil cooler is turned off, when different input rotating speeds and different torques are transmitted by the clutch, a relation curve between time and transmission oil temperature is recorded, under the working condition, the transmission heat production source comprises shaft tooth heat production and clutch sliding friction heat production in the gear shifting process, heat dissipation is carried out on a shell in a heat dissipation mode, the shell heat dissipation model and the shaft tooth heat production model are combined to obtain a corresponding clutch heat production relation table under the working conditions of different input rotating speeds and different clutches transmitting torques, the clutch heat production model is corrected, the corrected shaft tooth heat production model and the clutch heat production model are synthesized and superposed to obtain the transmission heat production model, and Sa、Sb、ScAnd SdAnd selecting according to the bench verification test data.
Since the design parameters of the gears and bearings are known, the transmission torque of the clutch, the input rotation speed and the output rotation speed of the clutch are obtained by the torque data of the engine and the rotation speed sensor integrated with the transmission in the input parameters of the heat generation model of the transmission.
Optionally, the transmission torque of the clutch, the input end rotating speed and the output end rotating speed of the clutch are read, and the information of the gear shifting position of the transmission, the service time of each gear and the transmission torque value of the corresponding time in the preset time period are calculated.
To improve safety, optionally n1The value of (a) is in the range of 0.8 to 0.9.
According to the transmission thermal management control method provided by the embodiment, the heating value of the transmission is calculated according to the running state of the whole vehicle, the cooling strategy of the transmission is determined based on the heating value calculation result and the temperature of the transmission oil, the heat dissipation effect is good, and the delay of the transmission heating value measurement is low.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments illustrated herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A transmission thermal management control method, comprising:
obtaining an oil temperature T of a transmissionnCalculating the heat generation quantity S of the transmission in a preset time periodnSetting TLAnd THSetting n for two oil temperature thresholds of a transmission1Setting S for oil temperature safety coefficient of transmissiona、Sb、ScAnd SdFour heat production threshold values with numerical values from small to large are sequentially arranged;
when T isn＜TLWhen the cooling liquid is in the cooling liquid loop, the switch valve of the cooling liquid loop is closed;
when T isL≤Tn＜n1*THAnd S isn＜SaWhen the cooling liquid is in the cooling liquid loop, the switch valve of the cooling liquid loop is closed;
when T isL≤Tn＜n1*THAnd S isa≤Sn＜SbWhen the cooling liquid is cooled, the switch valve of the cooling liquid loop is opened, and the shunt valve keeps the initial shunt proportion;
when T isL≤Tn＜n1*THAnd S isb≤Sn＜ScWhen the cooling liquid is cooled, the on-off valve of the cooling liquid loop is opened, the flow dividing ratio of the flow dividing valve is changed, the flow rate of the cooling liquid is increased, and the increase value of the flow rate of the cooling liquid is equal to (S)n-Sb)/(Sc-Sb) The numerical values are in direct proportion;
when T isL≤Tn＜n1*THAnd S isn≥ScWhen the cooling system is started, the switch valve of the cooling liquid loop is opened, the shunt valve distributes the maximum cooling liquid flow for the cooling circuit of the speed changer, the oil flow of the speed changer is increased through the oil pump of the speed changer, and the speed changerIncrease in oil flow and (S)n-Sc)/(Sd-Sc) The numerical values are in direct proportion;
when n is1*TH≤Tn＜THWhen the cooling system is started, the switch valve of the cooling liquid loop is opened, the shunt valve distributes the maximum cooling liquid flow for the transmission cooling loop, the transmission oil pump provides the maximum transmission oil flow for the oil cooler, and the cooling fan of the cooling liquid loop is started;
when T isn≥THWhen the clutch is in a closed state, the switch valve of the cooling liquid loop is opened, the shunt valve distributes the maximum cooling liquid flow for the transmission cooling loop, the transmission oil pump provides the maximum transmission oil flow for the oil cooler, the cooling fan of the cooling liquid loop is started, and the clutch is forcibly separated.
2. The transmission thermal management control method of claim 1, wherein the heat production of the transmission comprises clutch heat production, bearing heat production, and gear heat production.
3. The transmission thermal management control method according to claim 2, characterized in that the input torque of the clutch is obtained according to engine calibration data, the friction work of the clutch is calculated according to the rotating speed of the driving end and the rotating speed of the driven end of the clutch and the transmission torque value of the clutch, and a clutch heat generation model is obtained.
4. The transmission thermal management control method according to claim 3, wherein the gear heat production amount comprises friction power loss and oil churning power loss, the friction power loss is calculated by building a gear model, the oil churning power loss is calculated by an empirical formula, and a gear heat production model is obtained by integrating the friction power loss and the oil churning power loss.
5. The transmission thermal management control method according to claim 4, wherein the bearing heat production amount comprises a load-related heat production amount and a load-unrelated oil churning heat production amount, a bearing heat production model is obtained by establishing a bearing model calculation, and a gear heat production model and a bearing heat production model are integrated to obtain an axle tooth heat production model.
6. The transmission thermal management control method according to claim 5, wherein a rack verification is performed on a shaft tooth heat generation model, cooling of an oil cooler is turned off, when the transmission is in different gears at different input rotating speeds and the clutch transmits different torques, a relation curve between time and transmission oil temperature is recorded, under the working condition, a heat generation source of the transmission generates heat for the shaft tooth, a heat dissipation mode is a shell heat dissipation mode, and under the working condition that the shell heat dissipation model is combined, a relation table corresponding to the heat generation amount of the shaft tooth is obtained, and the heat generation model of the shaft tooth is corrected.
7. The transmission thermal management control method according to claim 6, wherein the clutch heat generation model is subjected to bench verification, cooling of an oil cooler is turned off, a relation curve between time and transmission oil temperature is recorded when different input rotating speeds and different torques are transmitted by a clutch, under the condition that the transmission heat generation source comprises shaft tooth heat generation and clutch sliding friction heat generation in a shifting process, the heat dissipation mode is shell heat dissipation, the shell heat dissipation model and the shaft tooth heat generation model are combined to obtain a corresponding clutch heat generation relation table under the conditions of different input rotating speeds and different clutch transmission torques so as to correct the clutch heat generation model, the corrected shaft tooth heat generation model and the clutch heat generation model are synthesized, and the transmission heat generation model is obtained by superposition, Sa、Sb、ScAnd SdAnd selecting according to the bench verification test data.
8. The transmission thermal management control method according to claim 7, wherein the transmission torque of the clutch, the input rotation speed of the clutch and the output rotation speed of the clutch among the input parameters of the transmission heat generation model are obtained by torque data of an engine and a rotation speed sensor integrated with the transmission.
9. The transmission thermal management control method according to claim 8, characterized by reading the transmission torque of the clutch, the input end rotating speed and the output end rotating speed of the clutch, and calculating the information of the gear shifting position of the transmission, the service time of each gear and the transmission torque value corresponding to the gear shifting position within a preset time period.
10. The transmission thermal management control method of any of claims 1-9, where n is1The value of (a) is in the range of 0.8 to 0.9.
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| CN114017490B (en) * | 2021-10-13 | 2023-06-30 | 岚图汽车科技有限公司 | Transmission thermal management control method and system and electronic equipment |
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