CN114776434B - Engine radiator outlet water temperature prediction method - Google Patents
Engine radiator outlet water temperature prediction method Download PDFInfo
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- CN114776434B CN114776434B CN202210291427.6A CN202210291427A CN114776434B CN 114776434 B CN114776434 B CN 114776434B CN 202210291427 A CN202210291427 A CN 202210291427A CN 114776434 B CN114776434 B CN 114776434B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 230000017525 heat dissipation Effects 0.000 claims abstract description 9
- 238000001816 cooling Methods 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 4
- 239000000110 cooling liquid Substances 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 230000005855 radiation Effects 0.000 abstract description 4
- 239000002826 coolant Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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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
-
- 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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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Data Mining & Analysis (AREA)
- Mechanical Engineering (AREA)
- Combustion & Propulsion (AREA)
- Theoretical Computer Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Computational Mathematics (AREA)
- Pure & Applied Mathematics (AREA)
- Databases & Information Systems (AREA)
- Software Systems (AREA)
- Algebra (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a method for estimating the water temperature at the outlet of an engine radiator, which comprises the following steps: calculating according to the opening degree and the rotating speed of the thermal management module to obtain estimated flow of the radiator; calculating according to the standing time of the engine and the water temperature of the radiator in the last driving cycle and the ambient temperature to obtain the estimated water temperature of the radiator after standing; calculating the heat dissipation power of the radiator; calculating the heating power of the radiator; and calculating according to the heat radiation power of the radiator and the heat radiation power of the radiator to obtain the water temperature at the outlet of the radiator. According to the invention, the radiator water temperature sensor is canceled by estimating the radiator water temperature, 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 the water temperature at an outlet of an engine radiator.
Background
In the prior art, whether the temperature of water is reduced due to warm air or the temperature of water is reduced due to the failure (large circulation opening) of a thermostat or a thermal management module can not be distinguished through a cylinder cover water outlet temperature sensor or a cylinder body, the risk of false alarm failure due to warm air opening exists, and whether the large circulation is opened or not can be directly monitored by increasing a radiator outlet temperature sensor, so that whether the thermostat or the thermal management module has a failure is proved. It should be noted here that certain failures of the thermal management module may be diagnosed by the position sensor, but that either the TMM seal is disengaged or the position sensor is unreliable may result in a large circulation of coolant.
In the currently known control system, a radiator outlet water temperature sensor is used to monitor whether the large circulation is on.
Disclosure of Invention
The invention aims to provide a method for estimating the water temperature at the outlet of an engine radiator, which is used for saving cost by estimating the water temperature of the radiator and canceling a radiator water temperature sensor.
In order to solve the technical problems, the technical scheme of the invention is as follows: a water temperature estimation method for an outlet of an engine radiator comprises the following steps:
calculating according to the opening degree and the rotating speed of the thermal management module to obtain estimated flow of the radiator;
calculating according to the standing time of the engine and the water temperature of the radiator in the last driving cycle and the ambient temperature to obtain the estimated water temperature of the radiator after standing;
calculating the heat dissipation power of the radiator;
calculating the heating power of the radiator;
and calculating according to the heat radiation power of the radiator and the heat radiation power of the radiator to obtain the water temperature at the outlet of the radiator.
The estimated flow of the radiator is also related to the opening or closing of the warm air water valve.
The method for calculating the estimated water temperature of the radiator after standing is as follows:
wherein T is RadSoakTemp For estimating the water temperature of the radiator after standing, T RadLastKeyCy l is the radiator water temperature of the previous driving cycle, t ConOffTime For engine down time, t 0 Is a time constant, T Amb At ambient temperature, T AmbLastKeyCy l is the ambient temperature for the last driving cycle.
The radiator heat dissipation power is influenced by the vehicle speed and the control duty ratio of the cooling fan, and the calculation method of the radiator heat dissipation power comprises the following steps:
P RadCoolPow [i]＝T RadTempLast [i-1]-T Amb )*f(max(V Vehspd ，f 1 (p FanPercent )))
wherein V is VehSpd For the speed of the vehicle, T RadTempLast [i-1]Radiator water temperature p as last sampling point FanPercent To control the duty cycle for the cooling fan, P RadCoolPow [i]And radiating power for the radiator.
The radiator heating power is affected by the flow entering the radiator, the engine water temperature and the radiator temperature difference, and the calculation method of the radiator heating power comprises the following steps:
P RadHeatPow [i]＝T RadTempLast [i-1]-T EngCool )*F RadFlow *C CoolHeat *R CoolantDensity *K
wherein T is EngCool C is the water temperature of the cylinder cover CoolHeat R is the specific heat capacity of the cooling liquid CoolantDensity For the coolant density, K is the unit conversion constant.
The method for calculating the water temperature at the outlet of the radiator comprises the following steps:
T HEex ＝(P RadHeatPo w-P RadCoolPow )/K HeatEx
wherein T is HEex K is the variation value of the outlet water temperature of the radiator HeatEx Is the exchange coefficient;
when the engine is in a state of being turned off,
T RadTemp ＝T RadSoakTemp
when the engine is not in a flameout state,
T RadTemp [i]＝T HEex *T s +T RadTemp [i-1]
wherein T is s Is a practical constant, T RadTemp [i]For the outlet water temperature of the radiator, T RadTemp [i-1]The radiator outlet water temperature calculated last time.
t 0 5s.
C CoolHeat 3.5KJ/kg.K, R CoolantDensit y is 1030g/L and K is 0.01667 x 0.001.
K HeatEx Is 5, T s 0.01.
Compared with the prior art, the invention has the beneficial effects that:
by estimating the water temperature of the radiator, a water temperature sensor of the radiator is canceled, 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 diagram of a system structure according to an embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
The central idea of the method is that the water temperature estimation is carried out through a heat exchange model with 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. The engine electric control unit ECU receives the water temperature signal of the water outlet, the water temperature sensor of the cylinder cover and the engine rotating speed signal through hard wires.
The method flow is as shown in figure 1:
(1) the estimated flow of the radiator is related to the opening of the warm air water valve, the opening of the thermal management module and the rotating speed.
When the warm air water valve is opened,
F RadFlow ＝f 1 (N Engspd ，A TMMAngle ) ①
when the warm air water valve is closed,
F RadFlow ＝f 2 (N Engspd ，A TMMAngle ) ②
the estimated flow of the radiator when the warm air water valve is opened in the system is shown in the table 1:
TABLE 1
The estimated flow of the radiator when the warm air water valve is closed is shown in table 2:
TABLE 2
(2) The estimated radiator water temperature after standing is obtained according to the radiator water temperature of the previous driving cycle and the environment temperature according to the standing time of the engine, and the formula is as follows:
wherein T is RadSoakTemp For estimating the water temperature of the radiator after standing, T RadLastKeyCyl Radiator water temperature, t, for the last driving cycle ConOffTime For engine down time, T0 is a time constant (T0 takes 5s in this example), T Amb At ambient temperature, T AmbLastKeyCy l is the ambient temperature for the last driving cycle.
(3) And estimating the water temperature at the outlet of the radiator, and obtaining the water 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 formula (2),
P RadCoolPow [i]＝T RadTempLast [i-1]-T Amb )*f(max(V VehSp ，f 1 (p FanPercent ))) ④
wherein V is VehSpd For the speed of the vehicle, T RadTempLast [i-1]Radiator water temperature p as last sampling point FanPercent To control the duty cycle for the cooling fan, P RadCoolPow [i]The heat dissipation power is this time.
The radiator heating power is affected by the flow rate into the radiator, the engine water temperature and the radiator temperature difference, a heat exchange model based on heat balance is shown as a formula (3),
P RadHeatPow [i]＝T RadTempLast [i-1]-T EngCool )*F RadFlow *C CoolHeat *R CoolantDensit y*K ⑤
wherein T is EngCool C is the water temperature of the cylinder cover CoolHeat Specific heat capacity of cooling liquid (CC in this example oolHeat Take 3.5 KJ/kg.K), R CoolantDensity Is the density of the cooling liquid (C in this example CoolHeat 1030 g/l), K is the unit conversion constant (0.01667 x 0.001)
The water temperature at the outlet of the radiator is obtained according to the heating power of the radiator and the radiating power of the radiator, the water temperature at the outlet of the radiator is changed as shown in formula (6),
T HEex ＝(P RadHeatPow -P RadCoolPow )/K HeatEx ⑥
when the engine is turned off, T RaaTemp ＝T RadSoakTemp ⑦
When the engine is not in a flameout state, T RadTemp [i]＝T HEex *T s +T RadTemp [i-1] ⑧
Wherein T is HEex K is the variation value of the outlet water temperature of the radiator HeatEx Is the exchange coefficient (K in this example HeatEx Take 5), T s Is the actual constant (T in this example s 0.01), T RadTemp [i-1]Which is the last value of the radiator outlet temperature.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (7)
1. The method for estimating the water temperature at the outlet of the engine radiator is characterized by comprising the following steps of:
calculating according to the opening degree and the rotating speed of the thermal management module to obtain estimated flow of the radiator;
calculating according to the standing time of the engine and the water temperature of the radiator in the last driving cycle and the ambient temperature to obtain the estimated water temperature of the radiator after standing;
calculating the heat dissipation power of the radiator;
calculating the heating power of the radiator;
calculating to obtain the outlet water temperature of the radiator according to the radiating power of the radiator and the heating power of the radiator;
the radiator heat dissipation power is influenced by the vehicle speed and the control duty ratio of the cooling fan, and the calculation method of the radiator heat dissipation power comprises the following steps:
P RadCoolPow [i]＝(T RadTempLast [i-1]-T Amb )*f(max(V VehSpd ,f 1 (p FanPercent )))
wherein V is VehSpd For the speed of the vehicle, T RadTempLast [i-1]Radiator water temperature p as last sampling point FanPercent To control the duty cycle for the cooling fan, P RadCoolPow [i]Radiating power for the radiator;
the radiator heating power is affected by the flow entering the radiator, the engine water temperature and the radiator temperature difference, and the calculation method of the radiator heating power comprises the following steps:
P RadHeatPow [i]＝(T RadTempLast [i-1]-T EngCool )*F RadFlow *C CoolHeat *R CoolantDensity *K
wherein T is EngCool C is the water temperature of the cylinder cover CoolHeat R is the specific heat capacity of the cooling liquid CoolantDensity K is a unit conversion constant, F RadFlow Flow is estimated for the radiator.
2. The method of claim 1, wherein the estimated radiator flow is further associated with opening or closing a warm air water valve.
3. The method for estimating the water temperature at the outlet of an engine radiator according to claim 1, wherein the method for estimating the water temperature at the outlet of the radiator after standing is:
wherein T is RadSoakTemp For estimating the water temperature of the radiator after standing, T RadLastKeyCyl Radiator water temperature, t, for the last driving cycle ConOffTime For engine down time, t 0 Is a time constant, T Amb At ambient temperature, T AmbLastKeyCyl Is the ambient temperature for the last driving cycle.
4. The method for estimating an outlet water temperature of an engine radiator according to claim 1, wherein the method for calculating the outlet water temperature of the radiator is as follows:
T HEex ＝(P RadHeatPow -P RadCoolPow )/K HeatEx
wherein T is HEex K is the variation value of the outlet water temperature of the radiator HeatEx Is the exchange coefficient;
when the engine is in a state of being turned off,
T RadTemp ＝T RadSoakTemp
when the engine is not in a flameout state,
T RadTemp [i]＝T HEex *T s +T RadTemp [i-1]
wherein T is s Is a practical constant, T RadTemp [i]For the outlet water temperature of the radiator, T RadTemp [i-1]The radiator outlet water temperature calculated last time.
5. A method for estimating an outlet water temperature of an engine radiator as claimed in claim 3, wherein t 0 5s.
6. The method for estimating an outlet water temperature of an engine radiator according to claim 1, wherein C CoolHeat 3.5KJ/kg.K, R CoolantDensity At 1030g/L, K is 0.01667 x 0.001.
7. The method for estimating a water temperature at an outlet of a radiator according to claim 4, wherein K HeatEx Is 5, T s 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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Citations (7)
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|---|---|---|---|---|
| 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 |
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106089395B (en) * | 2016-07-26 | 2018-11-02 | 广州汽车集团股份有限公司 | Engine water temperature control method and device |
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- 2022-03-23 CN CN202210291427.6A patent/CN114776434B/en active Active
Patent Citations (7)
| 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 |
| 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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