EP2834490A1 - Estimation de l'etat thermique d'un moteur - Google Patents
Estimation de l'etat thermique d'un moteurInfo
- Publication number
- EP2834490A1 EP2834490A1 EP13715353.2A EP13715353A EP2834490A1 EP 2834490 A1 EP2834490 A1 EP 2834490A1 EP 13715353 A EP13715353 A EP 13715353A EP 2834490 A1 EP2834490 A1 EP 2834490A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- module
- engine
- temperature
- iterative
- correction
- 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.)
- Granted
Links
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
- 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
- F01P2037/00—Controlling
- F01P2037/02—Controlling starting
Definitions
- the present invention relates generally to temperature monitoring of motor vehicle engines, and more particularly to a cooling circuit for a combustion engine, as well as to a method for controlling such a circuit. cooling.
- the invention relates for this purpose to a cooling circuit for a combustion engine, comprising a control device adapted to temporarily maintain the cooling circuit in a non-active state following a start of the combustion engine and to thus temporarily prevent a circulation of a cooling fluid in the cooling circuit,
- this control device being characterized in that it comprises an iterative temperature estimation module, able to deliver on (N + 1) channels of on the one hand N estimated values of the respective temperatures of a plurality of thermal nodes considered as essential engine locations for monitoring the thermal state of said engine and on the other hand an (N + 1) - th value which is an estimated value of the coolant temperature, where N is an integer, an input data presentation module, capable of supplying the Iterative temperature estimation dule a first series of M input signals, respectively associated with M operating parameters of the engine, and a second series of (N + 1) input signals, constituted by the (N + 1) previous available estimated values, present at the output of said iterative temperature estimation module, M representing an integer, a comparison module, able to provide a difference
- the advantageous solution thus proposed is to model the heat exchange in the engine by a multi-node system thermals each characterizing a temperature of a physical solid or liquid element of the engine, then iteratively perform estimates of these temperatures and corrections of the estimated temperatures.
- One of the thermal nodes corresponds to the coolant temperature sensor, and the corrections made during the successive iterations are based on the difference between the estimated temperature of the cooling fluid and the measurement provided by this sensor.
- the robustness of the process is related to the fact that this deviation, being zero at the optimum operating speed of the engine, can be used reliably as a basis for the progressive correction of the estimated temperatures until the end of the start-up period.
- the iterative temperature estimation module comprises the implementation of a thermal exchange modeling occurring between the N thermal nodes considered in the engine.
- the input data presentation module it comprises an initialization module, intended to provide the iterative temperature estimation module said first series of M input signals, and a delay module, provided to provide said iterative temperature estimation module with said second series of (N + 1) input signals.
- a single correction stage is provided, and it then comprises on the one hand an adjustment module, said adjustment being obtained by application of a function at the difference signal available at the output of the comparison module and said function being a linear function, such as a multiplication by a gain value, or a non-linear function, such as a correspondence from a table or a mapping, and secondly a correction module, said correction being performed respectively in each of (N + 1) output channels of the iterative estimation module of temperatures from (N + 1) output signals said adjustment module.
- the control device of said circuit comprises a second correction stage, adapted to perform on the M input signals of the M input channels of the estimation module. iterative temperature a second correction based on the result of said comparison.
- this second correction stage comprises successively a module for calculating the integral of the difference signal delivered by the comparison module, a clipping module of the output signal of said module integrality calculation method, an adjustment module, said adjustment being obtained by applying a function to the output signal of said clipping module and said function being a linear function, such as a multiplication by a gain value, or a non-linear function, such as a correspondence from a table or a map, and a correction module, said correction being respectively performed in each of the M input channels of the iterative temperature estimation module from M output signals of said adjustment module.
- the invention also relates to a control method of a cooling circuit for a combustion engine, wherein the cooling circuit is temporarily maintained in a non-active state following a start of the engine. thus temporarily preventing a circulation of a cooling fluid in the cooling circuit, which method is characterized in that it comprises an iterative temperature estimation step, designed to make iterative estimation of the value of the temperature.
- an input data presenting step intended to present in the iterative temperature estimation step on the one hand a first series of M signals of input, respectively associated with M operating parameters of the motor, and secondly a second series of (N + 1) input signals, constituted by the (N + 1) last estimated values available after the previous estimation step iterative temperature, a comparison step, wherein a difference signal between the estimated value of the coolant temperature and a measured value of said temperature is provided, and a first step of correcting the (N + 1) estimates of output, in which a first correction is performed on the (N + 1) output signals available after the iterative temperature estimation step, based on the result of said comparison.
- it further comprises a second step of correcting the M input signals, in which a second correction is performed on the M input signals before the step of iterative estimation of temperatures, based on the result of said comparison.
- the invention also relates to a computer program comprising a set of program code instructions recorded on a computer-readable medium, for implementing the steps of this temperature estimation method when said program operates. on a computer.
- FIG. 1 illustrates in a very simplified way a combustion engine and the main elements of its cooling system.
- FIG. 2 illustrates an exemplary embodiment of a cooling circuit control device according to the present invention.
- FIG. 1 very schematically shows a cooling circuit 1 1 of a combustion engine 100.
- the cooling circuit 1 1 comprises ducts 12 in which a cooling fluid (in general, from the engine) can circulate. water with antifreeze).
- the conduits on the one hand enter the motor 100, so that the fluid, while circulating, can cool it, and on the other hand feed a radiator 13, so that the cooling fluid can itself be cooled by transfer of the heat it has accumulated to the outside of the vehicle.
- a not shown sensor, placed in the engine on the path of the cooling fluid, provides a measurement of the temperature of this fluid.
- the cooling circuit 1 1 also comprises a pump 14, intended, according to the adjustment imposed on it, to vary the flow rate of the cooling fluid in the cooling circuit (as a function of input data, noted ID, such as engine load, amount of fuel injected, air flow, etc.).
- ID such as engine load, amount of fuel injected, air flow, etc.
- controller 15 receives ID input data from a controller 15.
- This controller can be implemented by corresponding hardwired circuits, but in the embodiment described below, this device is preferably a computer, incorporating a processor or a microprocessor, which comprises or software for performing the series of instructions.
- This control device is, in particular, able to determine at regular intervals the optimum flow rate of the pump which, depending on the received parameter values, allows the cooling of the engine and its maintenance in the thermal state corresponding to its optimal operation.
- control device 15 When the engine is started, however, the operation of the control device is different. When powering up for a start of the vehicle engine, the control device 15 requires that the cooling circuit is temporarily kept inactive. In the embodiment described, where the control device 15 is a computer incorporating a control software or software, this result is obtained using a specific instruction present in the computer memory and activated during the detection of power up for startup.
- FIG. 2 illustrates a first exemplary embodiment of a cooling circuit control device according to the present invention.
- control device it is necessary to understand, in the context of the invention described, all the functions that are useful for the implementation of the invention, but this does not exclude that the control device can also include, in hardware form or in software form, other subsets called to control, control or manage, in the motor vehicle, other functions not directly related to the implementation of the invention. These subsets and these other functions are then not mentioned in the present description, although present in the control device.
- the control device shown in FIG. 2 firstly comprises an iterative temperature estimation module 20, whose objective is to make temperature estimates at a number of engine locations considered as points. essential for monitoring the thermal state of the motor.
- This objective is achieved by means of a thermal modeling of the engine, intended to express the heat exchange in the engine and comprising for this purpose the different temperatures at said locations as variables of the modeling process.
- the modeling is carried out as follows.
- a number N of locations considered essential in the engine are selected. These locations of particular interest, called temperature nodes, correspond in the embodiment described to solid physical elements (for example, a cylinder head, a piston, a housing, etc.) or liquid (for example, oil, water, air, etc.), not shown.
- the temperatures of these nodes are initialized to the value of the outside ambient temperature, if the engine had been stopped for a long time and thus completely cooled, or to higher temperatures which had been memorized during the last stop, in case of a short stop that has not allowed the engine to cool completely.
- the iterative temperature estimation module 20 receives a number of inputs distributed as follows.
- the controller 15 includes an initialization module 21 providing the module 20 with a first series of M input signals, which are values of M engine operating parameters necessary to perform the thermal modeling of the engine. These input signals, supplied on input channels in parallel, are denoted by Input_1, ..., Input_M, with the index i of the input concerned varying from 1 to M. They These include vehicle speed, engine speed, engine torque, fuel quantity, heat flow, outdoor temperature, fan speed, combustion mode, etc.
- the module 20 receives on the other hand a second series of input signals, which includes the initial values (at startup, during the first iteration), or the previously estimated values (during subsequent iterations) of the temperatures. in each of the temperature nodes defined above, and looped back to the input of the module 20.
- These input signals in number N, are denoted T ° _1 (t-1), T ° _N (t-1) before that the iterative estimation of temperatures has taken place.
- the N values of the temperature of the nodes after the iterative estimation of temperatures has taken place are denoted T ° _1 (t), T ° _N (t).
- the index j of the input concerned varies from 1 to N, and t denotes the successive instants of estimation from the initial moment.
- the module 20 finally receives an additional input T ° _capteur (t-1) which is included in said second series of input signals and consists of the initial value (at startup, during the first iteration) or the value previously estimated (during subsequent iterations) of the temperature of the cooling fluid, taking into account the operation of this module 20, which is now described.
- T ° _capteur t-1
- the nodes are modeled, by applying the laws of thermodynamics, in the form of a mathematical representation constituted by a state equation.
- This equation takes into account, on the one hand, for each node, the interaction with the environment of the engine, involving the M input signals, M being an integer, constituting the main inputs of the model (the M values of parameters provided by the initialization module 21) and secondly, to take account of the evolution of the heat balance, the (N + 1) initial or estimated values corresponding respectively to the N initial temperature values or estimated for the N nodes and supplemented by the initial or estimated temperature value for the cooling fluid.
- the temperature of the cooling fluid is not representative of the thermal state of the engine. This temperature of the cooling fluid is therefore, on the one hand, an incorrect basis for monitoring this thermal state.
- anomalies could appear, for example drifts relating to the parameters taken into account, or defective initializations, due to a bad initialization of the engine. memories.
- a correction strategy based on the value of this difference: indeed, under optimal operating regime of the engine, this difference would be zero, it is therefore possible, in the start-up period, to use the value of this difference as an element of correction in the iterative process.
- a temperature sensor 22 provides the measured temperature of the coolant, noted T ° _measure.
- the difference signal Diff (t) thus obtained is sent to a correction stage located in a so-called proportional action channel.
- This floor of correction comprises an adjustment module 24 and a correction module 25.
- the adjustment module 24 is intended to develop the necessary corrections to ensure the progressive convergence of the temperatures estimated by the module 20 to temperatures close to the actual temperatures at the different nodes. of the motor.
- the module 24 comprises for this purpose (N + 1) calculation units 24_ (1), 24_ (j), 24_ (N + 1) in parallel, representing a linear function (action of a constant gain, for example) or a nonlinear function (use of maps, for example).
- the correction module 25 comprises for this purpose (N + 1) adders 25_ (1) to 25_ (N + 1) respectively arranged in the output channels of the module 20.
- the temperatures estimated by the iterative temperature estimation module 20 and corrected by the action of the correction module 25 are transferred to the input of the module 20 via a delay module 26.
- the module Delay 26 and the initialization module 21 together constitute an input data presentation module.
- the (N + 1) delays introduced in parallel in each of the output channels of the module 20 make it possible to deliver, synchronously with the M input signals presented, the temperatures of the (N + 1) nodes at the instant which precedes the one for which the module 20 will provide new estimated values.
- the operation continues in the manner just described, by successive iterations, until the difference between the temperature of the cooling fluid measured by the sensor 22 and the estimated temperature T ° _capteur (t ) estimated present at the input of the delay module 26 is below a predetermined threshold, previously fixed.
- a predetermined threshold previously fixed.
- the temperature of the cooling fluid as estimated by the module 20 is substantially equal to the measured temperature and can again be considered as representative of the thermal state of the engine.
- the control device 15 which had temporarily kept the cooling system in an inactive state, terminating this inactivity and allowing the flow of coolant to be established, which, at the same time, marks the end of the start-up period and the cooling operations. iterative and correction estimates made during this period.
- the exemplary embodiment of the cooling circuit control device which has just been described with reference to FIG. 2 is an implementation of a method which, in accordance with the principle of the invention, comprises the steps following. Since the combustion engine of a motor vehicle is in the starting phase, the engine control method consists first of imposing the temporary maintenance (that is to say, only during the whole start-up period) of the cooling circuit. in a non-active state by preventing the flow of cooling fluid in this circuit.
- a first step is first of all provided for iteratively estimating temperatures at a plurality of engine locations (for example, at the number of N) considered as essential points for monitoring its thermal state, as well as a estimation of the temperature of the cooling fluid.
- This objective is achieved by means of a thermal modeling of the engine, intended to express the heat exchanges in the engine and comprising for this purpose different temperatures as variables of the modeling process.
- This step of iterative temperature estimation is performed from input data which are on the one hand M input signals associated with M operating parameters of the engine and on the other hand (N + 1) signals input values consisting of the (N + 1) values estimated during the previous iteration.
- control method further comprises a step of comparing the estimated value for the temperature of the cooling fluid and a measured value of said temperature, followed by a step of correction of the (N + 1) signals resulting from said estimates, based on the result of this comparison step.
- the method may further comprise a second step of correcting the M input signals associated with the M operating parameters, also on the basis of the result of the comparing step.
- the progress of these steps is performed under the control of the control device which incorporates for this purpose a computer program comprising a set of program code instructions. This program is recorded on a medium, which is readable by a computer or a processor supervising the implementation of the steps of the method.
- This control method is usable in a motor vehicle comprising a cooling circuit as described above.
- This alternative embodiment consists of the establishment of a second correction stage (31, 32, 33, 34), located in a so-called integral action path and shown in broken lines in FIG. Diff (t) difference signal obtained at the output of the comparison module 23 is sent to this second correction stage, which comprises an integral calculation module 31, a saturation module 32, a (second) adjustment module 33 and a (second) correction module 34.
- the module 31 calculates the integral of the output signal of the comparison module 23.
- the saturation module 32 imposes a limitation on possible overruns of the integral calculation module 31.
- the second adjustment module 33 is similar to the first adjustment module 24 and comprises for example, like itself but in number M this time, calculation units 33_ (1), 33_ (i), 33_ (M) in parallel , representing a linear function (action of a constant gain, for example) or a nonlinear function (use of cartographies, for example).
- the second correction module 34 is similar to the first correction module and comprises for example, like itself but in number M this time, adders 34_ (1) to 34_ (M) respectively arranged in the input channels of the module 20, between the outputs of the input data presentation module and the corresponding inputs of the module 20. This second correction module 34 makes it possible to apply a so-called integral correction to the input signals of the module 20.
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- 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)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1253063A FR2989112B1 (fr) | 2012-04-04 | 2012-04-04 | Estimation de l'etat thermique d'un moteur |
| PCT/FR2013/050594 WO2013150207A1 (fr) | 2012-04-04 | 2013-03-20 | Estimation de l'etat thermique d'un moteur |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2834490A1 true EP2834490A1 (fr) | 2015-02-11 |
| EP2834490B1 EP2834490B1 (fr) | 2017-05-03 |
Family
ID=48083521
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP13715353.2A Active EP2834490B1 (fr) | 2012-04-04 | 2013-03-20 | Estimation de l'etat thermique d'un moteur |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2834490B1 (fr) |
| FR (1) | FR2989112B1 (fr) |
| WO (1) | WO2013150207A1 (fr) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3091557B1 (fr) | 2019-01-09 | 2020-12-04 | Continental Automotive | Contrôle thermique pour moteur de véhicule |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2796987B1 (fr) * | 1999-07-30 | 2002-09-20 | Valeo Thermique Moteur Sa | Dispositif de regulation du refroidissement d'un moteur thermique de vehicule automobile |
| US6321695B1 (en) * | 1999-11-30 | 2001-11-27 | Delphi Technologies, Inc. | Model-based diagnostic method for an engine cooling system |
| JP3956663B2 (ja) * | 2001-02-15 | 2007-08-08 | 株式会社デンソー | 内燃機関の冷却水温推定装置 |
| US7409928B2 (en) * | 2006-01-27 | 2008-08-12 | Gm Global Technology Operations, Inc. | Method for designing an engine component temperature estimator |
| DE102009056783B4 (de) * | 2009-12-03 | 2014-01-02 | Continental Automotive Gmbh | Verfahren und Vorrichtung zum Ermitteln eines vereinfachtmodellierten Kühlmitteltemperaturwertes für einen Kühlkreislauf einer Brennkraftmaschine |
| DE102010035366B4 (de) * | 2010-08-25 | 2014-01-02 | Audi Ag | Verfahren und Vorrichtung zur Diagnose einer Kühlmittelpumpe für eine Brennkraftmaschine |
-
2012
- 2012-04-04 FR FR1253063A patent/FR2989112B1/fr not_active Expired - Fee Related
-
2013
- 2013-03-20 WO PCT/FR2013/050594 patent/WO2013150207A1/fr not_active Ceased
- 2013-03-20 EP EP13715353.2A patent/EP2834490B1/fr active Active
Also Published As
| Publication number | Publication date |
|---|---|
| FR2989112B1 (fr) | 2014-04-25 |
| EP2834490B1 (fr) | 2017-05-03 |
| FR2989112A1 (fr) | 2013-10-11 |
| WO2013150207A1 (fr) | 2013-10-10 |
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