CN114776434A - Engine radiator outlet water temperature estimation method - Google Patents
Engine radiator outlet water temperature estimation method Download PDFInfo
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- CN114776434A CN114776434A CN202210291427.6A CN202210291427A CN114776434A CN 114776434 A CN114776434 A CN 114776434A CN 202210291427 A CN202210291427 A CN 202210291427A CN 114776434 A CN114776434 A CN 114776434A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000010438 heat treatment Methods 0.000 claims abstract description 15
- 230000017525 heat dissipation Effects 0.000 claims abstract description 12
- 238000001816 cooling Methods 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 4
- 239000002826 coolant Substances 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 2
- 239000000110 cooling liquid Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
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Abstract
The invention discloses a method for estimating water temperature at an outlet of an engine radiator, which comprises the following steps: calculating to obtain estimated flow of the radiator according to the opening and the rotating speed of the thermal management module; calculating to obtain the estimation of the water temperature of the radiator after standing according to the standing time of the engine, the water temperature of the radiator in the last driving cycle and the environment temperature; calculating the heat dissipation power of the radiator; calculating the heating power of the radiator; and calculating the water temperature at the outlet of the radiator according to the heat dissipation power of the radiator and the heating power of the radiator. According to the invention, the water temperature of the radiator is estimated, and a water temperature sensor of the radiator is omitted, so that the cost is saved.
Description
Technical Field
The invention belongs to the field of engine control, and particularly relates to a method for estimating water temperature at an outlet of an engine radiator.
Background
In the prior art, a water temperature sensor of outlet water of a cylinder cover or the cylinder body cannot distinguish whether the water temperature is reduced due to warm air heating or the water temperature is reduced due to faults (major cycle opening) of a thermostat or a thermal management module, the risk of false alarm fault due to warm air heating exists, and a temperature sensor at the outlet of a radiator can directly monitor whether the major cycle is opened or not, so that whether the thermostat or the thermal management module has faults or not is proved. It should be noted that some faults of the thermal management module can be diagnosed by the position sensor, but the cooling liquid can always circulate greatly due to the fact that the TMM sealing ring is dropped or the position sensor is unreliable.
In currently known control systems, a radiator outlet water temperature sensor is used to monitor whether the main cycle is on.
Disclosure of Invention
The invention aims to provide a method for estimating the water temperature of an outlet of an engine radiator, which cancels a radiator water temperature sensor by estimating the water temperature of the radiator and saves the cost.
In order to solve the technical problems, the technical scheme of the invention is as follows: an engine radiator outlet water temperature estimation method comprises the following steps:
calculating to obtain estimated flow of the radiator according to the opening and the rotating speed of the thermal management module;
calculating to obtain the estimation of the water temperature of the radiator after standing according to the standing time of the engine, the water temperature of the radiator in the last driving cycle and the environment temperature;
calculating the heat dissipation power of the radiator;
calculating the heating power of the radiator;
and calculating the water temperature at the outlet of the radiator according to the heat dissipation power of the radiator and the heating power of the radiator.
The estimated flow of the radiator is also related to the opening or closing of the warm air water valve.
The calculation method for estimating the water temperature of the radiator after standing comprises the following steps:
wherein, TRadSoakTempFor estimation of radiator water temperature after standing, TRadLastKeyCyl is the radiator water temperature of the last driving cycle, tConOffTimeAs engine off time, t0Is a time constant, TAmbIs the ambient temperature, TAmbLastKeyCyAnd l is the ambient temperature of the last driving cycle.
The heat dissipation power of the radiator is influenced by the vehicle speed and the control duty ratio of the cooling fan, and the calculation method of the heat dissipation power of the radiator comprises the following steps:
PRadCoolPow[i]＝TRadTempLast[i-1]-TAmb)*f(max(VVehspd，f1(pFanPercent)))
wherein, VVehSpdFor vehicle speed, TRadTempLast[i-1]The radiator water temperature p of the last sampling pointFanPercentControlling duty cycle, P, for cooling fansRadCoolPow[i]Dissipating heat power for the heat sink.
The heating power of the radiator is influenced by the flow entering the radiator, the water temperature of an engine and the temperature difference value of the radiator, and the calculation method of the heating power of the radiator comprises the following steps:
PRadHeatPow[i]＝TRadTempLast[i-1]-TEngCool)*FRadFlow*CCoolHeat*RCoolantDensity*K
wherein, TEngCoolWater temperature of cylinder head, CCoolHeatIs the specific heat capacity of the coolant, RCoolantDensityK is the unit transformation constant for coolant density.
The method for calculating the water temperature at the outlet of the radiator comprises the following steps:
THEex＝(PRadHeatPow-PRadCoolPow)/KHeatEx
wherein, THEexIs the change value of the water temperature at the outlet of the radiator, KHeatExIs the exchange coefficient;
when the engine is in a state of being turned off,
TRadTemp＝TRadSoakTemp
when the engine is not in a key-off state,
TRadTemp[i]＝THEex*Ts+TRadTemp[i-1]
wherein, TsIs a real constant, TRadTemp[i]Is the outlet water temperature of the radiator, TRadTemp[i-1]The last calculated radiator outlet water temperature.
t0Is 5 s.
CCoolHeat3.5KJ/kg. K, RCoolantDensity is 1030g/L and K is 0.01667 x 0.001.
KHeatExIs 5, TsIs 0.01.
Compared with the prior art, the invention has the beneficial effects that:
by estimating the water temperature of the radiator, a radiator water temperature sensor is omitted, and the cost is saved.
Drawings
FIG. 1 is a schematic flow chart of an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention. In addition, the technical features involved in the respective embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The method for estimating the water temperature of the outlet of the engine radiator has the central idea that the water temperature is estimated through a heat exchange model of heat balance.
The engine thermal management system is shown in fig. 2 and comprises an engine electronic control unit ECU, a thermal management module, a water outlet water temperature sensor, a cylinder cover water temperature sensor, a water pump and the like. An engine electronic control unit ECU receives a water outlet water temperature signal, a cylinder cover water temperature sensor and an engine rotating speed signal through hard wires.
The process flow is shown in figure 1:
the estimated flow of the radiator is related to the opening of a warm air water valve, the opening of a thermal management module and the rotating speed.
When the warm air water valve is opened,
FRadFlow＝f1(NEngspd，ATMMAngle) ①
when the warm air water valve is closed,
FRadFlow＝f2(NEngspd，ATMMAngle) ②
the system estimates the flow when the warm air water valve opens the radiator as shown in table 1:
TABLE 1
The estimated flow of the warm air water valve closing the radiator is as shown in table 2:
TABLE 2
Estimating the radiator water temperature after standing, wherein the estimation is obtained according to the engine standing time, the radiator water temperature of the last driving cycle and the environment temperature, and the formula is as follows:
wherein T isRadSoakTempFor estimation of radiator water temperature after standing, TRadLastKeyCylRadiator water temperature, t, for the last driving cycleConOffTimeFor engine off time, T0 is the time constant (5 s for T0 in this example), TAmbIs ambient temperature, TAmbLastKeyCyAnd l is the ambient temperature of the last driving cycle.
Estimating the temperature of the water at the outlet of the radiator, and obtaining the temperature according to the heating power of the radiator and the radiating power of the radiator. The heat dissipation power of the radiator is affected by the vehicle speed and the cooling fan, as shown in the formula II,
PRadCoolPow[i]＝TRadTempLast[i-1]-TAmb)*f(max(VVehSp，f1(pFanPercent))) ④
wherein VVehSpdAs the vehicle speed, TRadTempLast[i-1]Radiator water temperature p for the last sampling pointFanPercentControlling duty cycle, P, for cooling fansRadCoolPow[i]Is the current heat dissipation power.
The heating power of the radiator is influenced by the flow entering the radiator, the water temperature of an engine and the temperature difference value of the radiator, and based on a heat exchange model of heat balance, as shown in a formula III,
PRadHeatPow[i]＝TRadTempLast[i-1]-TEngCool)*FRadFlow*CCoolHeat*RCoolantDensity*K ⑤
wherein T isEngCoolWater temperature of cylinder head, CCoolHeatIs the specific heat capacity of the cooling liquid (CC in this example)oolHeatTaking 3.5KJ/kg. K), RCoolantDensityAs the density of the cooling liquid (C in this example)CoolHeatTake 1030g/l), K as a unit conversion constant (0.01667 x 0.001)
The water temperature at the outlet of the radiator is obtained according to the heating power and the radiating power of the radiator, the water temperature at the outlet of the radiator is changed according to a formula (c),
THEex＝(PRadHeatPow-PRadCoolPow)/KHeatEx ⑥
when the engine is turned off, TRaaTemp＝TRadSoakTemp ⑦
When the engine is not in a flameout state, TRadTemp[i]＝THEex*Ts+TRadTemp[i-1] ⑧
Wherein, THEexIs the change value of the water temperature at the outlet of the radiator, KHeatExIs the exchange coefficient (K in this example)HeatExTaking 5), TsIs a real constant (T in this example)sTaking 0.01), TRadTemp[i-1]The last value of the outlet temperature of the radiator.
It will be understood by those skilled in the art that the foregoing is only an exemplary embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, since various modifications, substitutions and improvements within the spirit and scope of the invention are possible and within the scope of the appended claims.
Claims (9)
1. An engine radiator outlet water temperature estimation method is characterized by comprising the following steps:
calculating to obtain estimated flow of the radiator according to the opening and the rotating speed of the thermal management module;
calculating to obtain the estimation of the water temperature of the radiator after standing according to the standing time of the engine, the water temperature of the radiator in the last driving cycle and the environment temperature;
calculating the heat dissipation power of the radiator;
calculating the heating power of the radiator;
and calculating the water temperature at the outlet of the radiator according to the heat dissipation power of the radiator and the heating power of the radiator.
2. The method of claim 1, wherein the estimated radiator flow rate is further related to the opening or closing of a warm air water valve.
3. The method for estimating the outlet water temperature of the engine radiator as claimed in claim 1, wherein the estimation method of the radiator water temperature after standing is as follows:
wherein, TRadSoakTempFor estimation of radiator water temperature after standing, TRadLastKeyCylRadiator water temperature, t, for the last driving cycleConoffTimeFor engine down time, t0Is a time constant, TAmbIs ambient temperature, TAmbLastKeyCylThe ambient temperature of the last driving cycle.
4. The method for estimating the water temperature at the outlet of the engine radiator as claimed in claim 3, wherein the radiator heat dissipation power is affected by the vehicle speed and the control duty ratio of the cooling fan, and the calculation method of the radiator heat dissipation power is as follows:
PRadCoolPow[i]＝TRadTempLast[i-1]-TAmb)*f(max(VVehs，f1(pFanPercent)))
wherein, VVehSpdFor vehicle speed, TRadTempLast[i-1]The radiator water temperature p of the last sampling pointFannPercentControlling duty cycle, P, for cooling fansRadCoolPow[i]Dissipating heat power for the heat sink.
5. The method of claim 4, wherein the radiator heating power is affected by the flow rate into the radiator, the temperature of the engine water, and the difference between the radiator temperature, and the radiator heating power is calculated by:
PRadHeatPow[i]＝TRadTempLast[i-1]-TEngCool)*FRadFlow*CCoolHeat*RCoolantDensity*K
wherein, TEngCoolWater temperature of cylinder head, CCoolHeatFor specific heat capacity of coolant, RCoolantDensityK is the unit transformation constant for coolant density.
6. The method for estimating the temperature of water at the outlet of the engine radiator as claimed in claim 5, wherein the method for calculating the temperature of water at the outlet of the radiator comprises:
THEex＝(PRadHeatPow-PRadCoolPow)/KHeatEx
wherein, THEexIs the change value of the water temperature at the outlet of the radiator, KHeatExIs the exchange coefficient;
when the engine is in a state of being turned off,
TRadTemp＝TRadSoakTemp
when the engine is not in a key-off state,
TRadTemp[i]＝THEex*Ts+TRadTemp[i-1]
wherein, TsIs a real constant, TRadTemp[i]Is the outlet water temperature of the radiator, TRadTemp[i-1]The last calculated radiator outlet water temperature.
7. The method of claim 3, wherein t is the temperature of water at the outlet of the engine radiator0Is 5 s.
8. The method of claim 5, wherein C is CCDolHeat3.5NJ/kg. K, RCoolantDensity1030g/L, K0.01667 0.001.
9. The method of claim 6, wherein K is an estimate of radiator outlet water temperatureHeatExIs 5, TsIs 0.01.
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| CN202210291427.6A CN114776434B (en) | 2022-03-23 | 2022-03-23 | Engine radiator outlet water temperature prediction method |
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| CN202210291427.6A CN114776434B (en) | 2022-03-23 | 2022-03-23 | Engine radiator outlet water temperature prediction method |
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| CN114776434B CN114776434B (en) | 2023-11-24 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009020804A1 (en) * | 2008-05-27 | 2009-12-24 | GM Global Technology Operations, Inc., Detroit | Control system for internal combustion engine system of vehicles, measures outlet temperature of cooling system and determines cooling performance based on measured outlet temperature and estimated fluid temperature |
| JP2010242525A (en) * | 2009-04-01 | 2010-10-28 | Toyota Motor Corp | Control device for water pump |
| GB201207567D0 (en) * | 2012-04-30 | 2012-06-13 | Gm Global Tech Operations Inc | Method of estimating the coolant inlet temperature in an internal combustion engine |
| CN107869383A (en) * | 2017-11-03 | 2018-04-03 | 吉林大学 | Automobile engine heat management system models and control method |
| CN109555592A (en) * | 2017-09-25 | 2019-04-02 | 丰田自动车株式会社 | Engine cooling apparatus |
| US20200370464A1 (en) * | 2016-07-26 | 2020-11-26 | Guangzhou Automobile Group Co., Ltd. | Method and Apparatus for Controlling Water Temperature of Engine |
| CN113378496A (en) * | 2021-07-26 | 2021-09-10 | 三一重机有限公司 | Engineering machinery and method for calculating inlet and outlet temperatures of radiator of engineering machinery |
| CN113482760A (en) * | 2021-07-09 | 2021-10-08 | 潍柴动力股份有限公司 | Cooling control method, device and system based on finished automobile running road condition |
-
2022
- 2022-03-23 CN CN202210291427.6A patent/CN114776434B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009020804A1 (en) * | 2008-05-27 | 2009-12-24 | GM Global Technology Operations, Inc., Detroit | Control system for internal combustion engine system of vehicles, measures outlet temperature of cooling system and determines cooling performance based on measured outlet temperature and estimated fluid temperature |
| JP2010242525A (en) * | 2009-04-01 | 2010-10-28 | Toyota Motor Corp | Control device for water pump |
| GB201207567D0 (en) * | 2012-04-30 | 2012-06-13 | Gm Global Tech Operations Inc | Method of estimating the coolant inlet temperature in an internal combustion engine |
| US20200370464A1 (en) * | 2016-07-26 | 2020-11-26 | Guangzhou Automobile Group Co., Ltd. | Method and Apparatus for Controlling Water Temperature of Engine |
| CN109555592A (en) * | 2017-09-25 | 2019-04-02 | 丰田自动车株式会社 | Engine cooling apparatus |
| CN107869383A (en) * | 2017-11-03 | 2018-04-03 | 吉林大学 | Automobile engine heat management system models and control method |
| CN113482760A (en) * | 2021-07-09 | 2021-10-08 | 潍柴动力股份有限公司 | Cooling control method, device and system based on finished automobile running road condition |
| CN113378496A (en) * | 2021-07-26 | 2021-09-10 | 三一重机有限公司 | Engineering machinery and method for calculating inlet and outlet temperatures of radiator of engineering machinery |
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