EP4051897A1 - Method for estimating the thermal state of an engine component and method for controlling powertrain commands - Google Patents
Method for estimating the thermal state of an engine component and method for controlling powertrain commandsInfo
- Publication number
- EP4051897A1 EP4051897A1 EP20796867.8A EP20796867A EP4051897A1 EP 4051897 A1 EP4051897 A1 EP 4051897A1 EP 20796867 A EP20796867 A EP 20796867A EP 4051897 A1 EP4051897 A1 EP 4051897A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- engine
- temperature
- heat
- instantaneous
- estimating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000001816 cooling Methods 0.000 claims abstract description 24
- 230000004913 activation Effects 0.000 claims abstract description 18
- 238000013475 authorization Methods 0.000 claims abstract description 16
- 239000012809 cooling fluid Substances 0.000 claims abstract description 10
- 230000009471 action Effects 0.000 claims abstract description 5
- 239000002826 coolant Substances 0.000 claims description 21
- 230000006870 function Effects 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 16
- 238000012937 correction Methods 0.000 claims description 12
- 230000004907 flux Effects 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 230000001419 dependent effect Effects 0.000 claims description 3
- 238000013507 mapping Methods 0.000 claims 1
- 230000035939 shock Effects 0.000 abstract description 9
- 238000002485 combustion reaction Methods 0.000 abstract description 2
- 230000001276 controlling effect Effects 0.000 description 20
- 230000033228 biological regulation Effects 0.000 description 5
- 230000015654 memory Effects 0.000 description 5
- 238000009835 boiling Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000007858 starting material Substances 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- F01P11/14—Indicating devices; Other safety devices
- F01P11/16—Indicating devices; Other safety devices concerning coolant temperature
-
- 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
- F01P3/00—Liquid cooling
- F01P3/02—Arrangements for cooling cylinders or cylinder heads
-
- 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
- F01P7/14—Controlling of coolant flow the coolant being liquid
- F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
- F01P7/162—Controlling of coolant flow the coolant being liquid by thermostatic control by cutting in and out of pumps
-
- 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
- F01P7/14—Controlling of coolant flow the coolant being liquid
- F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
- F01P7/164—Controlling of coolant flow the coolant being liquid by thermostatic control by varying pump speed
-
- 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
- F01P2031/00—Fail safe
- F01P2031/30—Cooling after the engine is stopped
Definitions
- the field of the invention relates to a method for estimating the thermal state of a thermal engine component and a method for managing a powertrain for controlling engine shutdowns and a cooling circuit pump.
- the repeated cuts of the heat engine cause thermal shocks at the level of the material of the engine components, in particular at the level of the turbocharger, the crankcase, the cylinder head, cylinder head gasket and the coolant pipes. Over time, these thermal shocks, if they are too frequent, are liable to prematurely damage the components of the heat engine.
- control strategies inhibit the functions of stopping and restarting the thermal engine and / or controlling the cooling loop of the thermal engine according to temperature parameters, measured or estimated, coolant and turbocharger.
- strategies also provide for the activation of the electric pump of the turbocharger circuit.
- patent document DE10347683A1 is known proposing the inhibition of the automatic stop and restart function, when the temperature of the power electronics of an alternator-starter exceeds a threshold value.
- patent document FR3018556A1 filed by the applicant proposing a method for estimating the thermal state of a starter determining the phases of use of the starter and starting of the thermal engine to avoid a heating and premature damage.
- An objective of the invention is to provide efficient thermal regulation of the internal components of the engine. Another objective is to propose a strategy for controlling engine shutdowns to avoid thermal shocks at the level of the internal components of the engine in extreme driving situations of high temperatures, for example at high outside temperature and high and continuous engine torque loads for example. .
- the invention relates to a method for estimating the temperature of a component of the power train for controlling one or more setpoints during the command to stop the heat engine, in which the temperature estimate consists in estimating the temperature instantaneous material of an internal component of the heat engine, said estimation comprising the following steps:
- the instantaneous heat flux is determined from a predetermined map delivering a value of the heat flux as a function of a measurement of the instantaneous engine speed and of an estimate of the instantaneous engine torque.
- the driving speed of the pump is determined from an instantaneous measurement of the speed of the heat engine.
- the invention provides a method for controlling an authorization instruction for a cut-off of a thermal engine of a powertrain, method in which the state of the authorization instruction is controlled by means of a predetermined map receiving a first input parameter which is the instantaneous temperature of the cooling fluid, in which the state of the setpoint is also controlled as a function of a second input parameter of the map which is the instantaneous temperature of the material d an internal component of the heat engine estimated by means of any one of the preceding embodiments of the method for estimating the temperature according to the invention.
- the invention also provides a method of controlling an auxiliary electric pump for circulating a thermal engine coolant of a power train comprising the determination of a duration of activation of the pump calculated at the instant of control of a cut-off of the thermal engine by a cut-off instruction and initiated from the moment of command of the cut-off, in which the activation time is determined by means of a map receiving a first input parameter which is a function of the instantaneous temperature of the engine coolant and a second input parameter which is a function of the temperature instantaneous time of the material of an internal component of the heat engine estimated by means of any one of the preceding embodiments of the method for estimating the temperature according to the invention.
- the cut-off instruction is dependent on the authorization instruction determined in accordance with the method according to the invention.
- a motor vehicle comprising a powertrain comprising a heat engine and a cooling circuit of said engine, the cooling circuit comprising a main mechanical pump driven by the motor shaft and an electric auxiliary pump, the group powerplant, in the event of a cut-off of the heat engine, being configured so as to activate the auxiliary pump during an activation period following the command instant of the cut-off, said activation period being determined in accordance with the method according to l 'invention.
- the invention also provides a program-computer product comprising instructions which, when the program is executed by a control unit of the powertrain, lead the latter to implement any one of the embodiments of the estimation method.
- the temperature of an internal component of the engine, the method for controlling the engine cut-off setpoint and the method for controlling the auxiliary pump in accordance with the invention are examples of the invention.
- the powertrain eliminates thermal shocks resulting from repetitive shutdowns of the thermal engine. Improved cooling thus takes into account the thermal inertia of the material of the internal components and limits its damage.
- FIG. 1 represents the functional modules of a drive train control unit for estimating the temperature of the internal component material of the engine and controlling an authorization signal for an engine shutdown according to l 'invention.
- FIG.2 more precisely represents the functional module for estimating the temperature of an internal component of the engine according to the invention.
- FIG. 3 represents more precisely the functional module for controlling the authorization signal for an engine shutdown according to the invention.
- FIG. 4 schematically shows an example of a predetermined map for controlling the authorization instruction for an engine shutdown according to the invention.
- FIG. 5 represents an example of an algorithm for executing the method for controlling a cooling circuit pump according to the invention in the non-limiting case of an engine stoppage during the activation of a ZEV driving mode.
- the invention applies to motor vehicle powertrains with conventional thermal propulsion or hybrid propulsion and proposes a method for estimating the temperature of the internal components of the thermal engine making it possible to improve the management of engine shutdowns and of the cooling circuit. extreme temperature or heavy load driving situation.
- the invention aims to improve thermal management during engine cuts of any type, for example STT, or even during ZEV travel.
- powertrains comprising a thermal engine are equipped with a cooling circuit dedicated to thermal management of engine components.
- the cooling circuit comprises a high temperature circuit, operating in temperature ranges up to a hundred degrees, and a bypass branch dedicated to cooling a turbocharger.
- the high temperature circuit comprises a main mechanical pump driven by the shaft of the heat engine ensuring the circulation of the cooling fluid in the high temperature circuit.
- the bypass has an electric auxiliary pump capable of circulating the liquid cooling in part or in the whole of the cooling circuit when the heat engine is stopped.
- the auxiliary pump can be controlled by controls, for example of the all-or-nothing type according to an activation setpoint, either when stopped or in constant rotating speed, or in speed regulation.
- the cooling circuit may include means for regulating the flow of the cooling fluid, for example valves or flaps, controlled by commands determined by the control unit of the heat engine depending on operating parameters of the powertrain, in particular the temperature. of the coolant, estimation of the temperature of the turbocharger, the engine speed, and in the context of the invention, estimates of the temperature of the material of the internal components of the heat engine.
- the main mechanical pump is driven by the motor shaft, thus preventing the thermal regulating action resulting from the flow of coolant in the cooling circuit in an engine shutdown situation.
- the invention firstly aims to authorize or not the engine cuts depending on the thermal situation of the engine to prevent thermal shocks in extreme thermal situations, and judiciously activate the electric auxiliary pump to circulate the cooling fluid in engine outage situation.
- FIG. 1 represents a drive unit control unit comprising functional modules according to the invention, a first module 10 is dedicated to the function of estimating the instantaneous temperature Tm of the material of one or more components. internal combustion engine and a second module 11 is dedicated to the control function of the reference signal CS_auth authorizing an engine shutdown.
- the first module 10 receives at each instant values of input parameters P_gmp of operation of the powertrain, among which there may be mentioned the temperature of the coolant measured by a sensor of the cooling circuit in degrees Celsius, the speed of rotation of the engine. heat engine in rpm, the engine torque in Nm, and possibly the instantaneous engine power.
- the estimated temperature Tm is then used for evaluate the operating conditions of internal engine components and manage engine shutdowns.
- FIG. 2 represents the functional module 10 for estimating the temperature of the material of an internal component of the engine.
- the temperature of the material Tm is an estimate of the temperature of engine components such as the crankcase, cylinder head, cylinder head gasket, or even the surface temperature of the engine's water core.
- the actual temperature at the level of the internal components differs significantly upwards from the temperature conventionally measured at the cylinder head outlet which corresponds to the temperature of the coolant and not of the internal components.
- the objective of module 11 is therefore to estimate the actual temperature in order to improve the management of thermal regulation and in particular to take into account the effects of thermal inertia of the material which can cause boiling, gas and overflow during an engine shutdown.
- the objective is therefore to set up a regulation process based on a temperature threshold specifically controlling the value of this estimate in addition to the temperature threshold controlling the value of the temperature of the coolant.
- the module 10 comprises a first block 101 for estimating the instantaneous heat flow 105 of the engine.
- This value 105 can be determined on the basis of an operating parameter of the powertrain which is representative of the instantaneous power.
- the instantaneous heat flux 105 is determined by a predetermined map, stored in the memory of the powertrain control unit, which delivers the value of the instantaneous heat flux 105 from the instantaneous engine torque and the engine speed. engine.
- the value 105 is a value expressed in Joule per second or Watts. From the value of this instantaneous heat flux, the block 101 determines an internal temperature variation resulting from the heat flux. The more the engine power increases, the more the temperature resulting from the heat flow increases.
- the module 10 comprises a second block 102 whose function is to deliver a correction value 106 for the temperature variation generated by the heat flows of the engine.
- the correction value 106 is representative of the cooling action of the engine cooling system. This correction value depends on the instantaneous rotation speed of the heat engine. Indeed, the flow rate of the cooling fluid is dependent on the rotational speed of the main mechanical pump and therefore of the heat engine. The more the engine speed increases, the more heat energy is drawn from inside the engine.
- the second block 102 is for example a predetermined map, stored in the memory of the powertrain control unit, delivering the correction value according to the measurement of the engine speed of rotation.
- a third block 103 has the function of estimating a temperature value 108 of the internal components from the heat flow 105, the correction factor 106 representative of the cooling action, and a value 107 of the instantaneous temperature of the cooling fluid. engine cooling. One or more other correction factors may be taken into account by block 103 to work out the value 108.
- the temperature value 108 is preferably processed by fourth final processing block 104, for example a low filter which depends on the value. engine speed, before delivering the temperature Tm to the module 11 for controlling the authorization setpoint for engine shutdown.
- FIG. 3 now shows the module 11 for controlling the setpoint CS_auth authorizing cut-off of the heat engine.
- the module estimates from a predetermined map, recorded in the memory of the powertrain control unit, taking as input parameter the value of the temperature Tm, delivered by the module 10, and the value of the temperature Te of the coolant of the thermal regulation circuit of the engine.
- the value of the setpoint CS_auth is controlled according to said input values
- the CS_auth instruction is in this example a type instruction Boolean signal that can take the value TRUE (1) to authorize an engine shutdown or FALSE (0) to prohibit an engine shutdown.
- FIG. 4 schematically represents a non-limiting example of a two-dimensional map for controlling the signal CS_auth.
- the value of the temperature of the coolant Te On the x-axis is shown the value of the temperature Tm of the material of the internal components of the engine determining the value of the signal CS_auth.
- the boxes of the map represent the values of the signal 1, 0 as a function of the temperatures Tm, Te. More precisely, the thermal engine cut-off authorization setpoint CS_auth is used by the control unit to authorize a cut-out to activate a ZEV driving mode in the case of a hybrid architecture, or a momentary cut-out of the "Stop" type.
- control unit includes a module for estimating a duration of activation of the auxiliary pump following the instant of detection of an engine failure.
- the function of this module is to activate the auxiliary pump for a period D_pp depending on the value of the temperature Tm and the value of the temperature of the coolant, in a manner similar to the map shown in figure 4.
- the determination map of the duration D_pp is configured to determine the value of the duration of actuation of the auxiliary pump as a function of the temperature values Tm, Te when the engine is cut off.
- the powertrain (or heat engine) control unit is fitted with an integrated circuit computer and electronic memories, the computer and the memories being configured to execute the temperature estimation process, the control process of the authorization signal and finally the method for controlling the auxiliary pump.
- the computer could be external to the control unit, while being coupled to the latter. In the latter case, it can itself be arranged in the form of a dedicated computer comprising a possible dedicated program, for example. Therefore, the control unit, according to the invention, can be produced in the form of software modules (or computer (or “software”)), or electronic circuits (or “hardware”), or a combination of electronic circuits and software modules.
- a first step 50 the assumption is made that the heat engine is operating at rotating speed, during travel during which an engine torque is transmitted to the wheels to move the vehicle.
- Estimates of the temperature Tm and the duration D_pp are also calculated.
- the control unit determines the value of the authorization setpoint CS_auth according to the predetermined map taking as input parameter the temperature value Tm and the value of the cooling fluid Te.
- the control unit prohibits, in step 52, engine shutdowns to prevent damage to the engine as well as the boiling phenomena explained above.
- This exceptional situation corresponds for example to very high outside temperatures, 40 ° C or more and / or to engine operating points with high load in torque and speed (for example, uphill mountain road, high vehicle mass) and with high temperatures. high coolant levels.
- the control unit authorizes, in a step 53, the engine cuts.
- This situation generally covers all cases of the life of the vehicle, apart from the exceptional ones mentioned in the previous paragraph.
- the pump activation time is always calculated.
- the D_pp activation time is frozen until the next start of the heat engine. After the D_pp time has elapsed after the moment the engine is stopped, the pump is turned off. The flow of coolant during this period cools internal engine components and eliminates thermal shock.
- Steps 54, 55 also apply to vehicle stop situations and to STT-type momentary shutdown situations.
- the electric pump has been described for one embodiment of a turbocharger bypass branch. This case is nevertheless in no way limiting and the invention applies to the control of any electric pump which can be activated in a situation of engine cut-off.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1912103A FR3102515B1 (en) | 2019-10-29 | 2019-10-29 | Method for estimating the thermal state of a motor component and method for controlling GMP commands |
PCT/FR2020/051740 WO2021084173A1 (en) | 2019-10-29 | 2020-10-05 | Method for estimating the thermal state of an engine component and method for controlling powertrain commands |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4051897A1 true EP4051897A1 (en) | 2022-09-07 |
Family
ID=69191008
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20796867.8A Withdrawn EP4051897A1 (en) | 2019-10-29 | 2020-10-05 | Method for estimating the thermal state of an engine component and method for controlling powertrain commands |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP4051897A1 (en) |
CN (1) | CN114616385A (en) |
FR (1) | FR3102515B1 (en) |
WO (1) | WO2021084173A1 (en) |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3941441B2 (en) * | 2001-09-11 | 2007-07-04 | トヨタ自動車株式会社 | Control device for start of internal combustion engine |
JP4082310B2 (en) * | 2002-10-15 | 2008-04-30 | 株式会社デンソー | Idle stop control device |
FR2907509A1 (en) | 2006-10-19 | 2008-04-25 | Peugeot Citroen Automobiles Sa | Characteristic parameter e.g. mass of air, estimating method for e.g. diesel engine, involves controlling thermal flux applied to component e.g. piston, of engine in closed loop, from derived magnitude of estimated characteristic parameters |
FR2933738B1 (en) * | 2008-07-11 | 2010-08-13 | Renault Sas | METHOD FOR CONTROLLING COOLANT FLOW RATE |
JP5556901B2 (en) * | 2010-12-24 | 2014-07-23 | トヨタ自動車株式会社 | Vehicle and vehicle control method |
FR2989113B1 (en) * | 2012-04-04 | 2014-04-25 | Peugeot Citroen Automobiles Sa | ESTIMATING A VIRTUAL TEMPERATURE IN A MOTOR |
FR3018556B1 (en) | 2014-03-13 | 2019-06-21 | Psa Automobiles Sa. | METHOD FOR PREDICTING THE THERMAL CONDITION OF A STARTER |
-
2019
- 2019-10-29 FR FR1912103A patent/FR3102515B1/en active Active
-
2020
- 2020-10-05 CN CN202080076417.XA patent/CN114616385A/en active Pending
- 2020-10-05 EP EP20796867.8A patent/EP4051897A1/en not_active Withdrawn
- 2020-10-05 WO PCT/FR2020/051740 patent/WO2021084173A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
CN114616385A (en) | 2022-06-10 |
FR3102515B1 (en) | 2023-09-08 |
WO2021084173A1 (en) | 2021-05-06 |
FR3102515A1 (en) | 2021-04-30 |
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