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EP1113157B1 - Cooling control device of an internal combustion engine of a vehicle during hot start - Google Patents

Cooling control device of an internal combustion engine of a vehicle during hot start Download PDF

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Publication number
EP1113157B1
EP1113157B1 EP00128308A EP00128308A EP1113157B1 EP 1113157 B1 EP1113157 B1 EP 1113157B1 EP 00128308 A EP00128308 A EP 00128308A EP 00128308 A EP00128308 A EP 00128308A EP 1113157 B1 EP1113157 B1 EP 1113157B1
Authority
EP
European Patent Office
Prior art keywords
temperature
fluid
engine
threshold
speed
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.)
Expired - Lifetime
Application number
EP00128308A
Other languages
German (de)
French (fr)
Other versions
EP1113157A1 (en
Inventor
Ngy Srun Ap
Mathieu Chanfreau
Arnaud Maire
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valeo Thermique Moteur SA
Original Assignee
Valeo Thermique Moteur SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Valeo Thermique Moteur SA filed Critical Valeo Thermique Moteur SA
Publication of EP1113157A1 publication Critical patent/EP1113157A1/en
Application granted granted Critical
Publication of EP1113157B1 publication Critical patent/EP1113157B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F01P7/02—Controlling of coolant flow the coolant being cooling-air
    • F01P7/04—Controlling of coolant flow the coolant being cooling-air by varying pump speed, e.g. by changing pump-drive gear ratio
    • F01P7/048—Controlling of coolant flow the coolant being cooling-air by varying pump speed, e.g. by changing pump-drive gear ratio using electrical drives
    • 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
    • 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
    • F01P7/167—Controlling of coolant flow the coolant being liquid by thermostatic control by adjusting the pre-set temperature according to engine parameters, e.g. engine load, engine 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
    • F01P5/00—Pumping cooling-air or liquid coolants
    • F01P5/10—Pumping liquid coolant; Arrangements of coolant pumps
    • F01P5/12—Pump-driving arrangements
    • F01P2005/125—Driving auxiliary pumps electrically
    • 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
    • F01P2007/146—Controlling of coolant flow the coolant being liquid using valves
    • 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
    • F01P2025/00—Measuring
    • F01P2025/08—Temperature
    • F01P2025/13—Ambient 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
    • F01P2025/00—Measuring
    • F01P2025/08—Temperature
    • F01P2025/30—Engine incoming fluid 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
    • F01P2025/00—Measuring
    • F01P2025/08—Temperature
    • F01P2025/32—Engine outcoming fluid 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
    • F01P2025/00—Measuring
    • F01P2025/60—Operating parameters
    • F01P2025/62—Load
    • 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
    • F01P2025/00—Measuring
    • F01P2025/60—Operating parameters
    • F01P2025/66—Vehicle 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
    • 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
    • F01P2060/00—Cooling circuits using auxiliaries
    • F01P2060/08—Cabin heater

Definitions

  • the invention relates to a cooling control device. of a motor vehicle heat engine according to the preamble of claim 1.
  • a cooling control device of a motor vehicle heat engine according to the preamble of claim 1.
  • Such a device is known from document EP-A-0 965 737.
  • the cooling device includes a cooling circuit traversed by a fluid, which is generally of water with antifreeze added.
  • This circuit includes a cooling branch containing a cooling radiator associated with a motor-fan unit, as well as a heating branch containing an air heater.
  • the radiator cooling is swept by an outside air flow which is set in motion by the speed of the vehicle and / or by the motor-fan unit.
  • the cooling branch can also include a pilot valve.
  • the heating branch contains an air heater, i.e. a heating radiator which is crossed by an air flow set in motion by a pulser. This air flow is then sent and distributed in the passenger compartment by distribution nozzles appropriate.
  • the air heater is part of an installation heating and / or air conditioning with aerothermal parameters adjustable.
  • the object of the invention is in particular to overcome the drawbacks supra.
  • It aims in particular to regulate the cooling of the heat engine in a hot engine start state, which can also be called restart state.
  • the invention provides for this purpose a device according to claim 1.
  • the device of the invention first determines whether the engine is in a warm start state and, if this is the case, it controls the pump speed and / or the group speed motor-ventilator under selected conditions, i.e. according to at least one predetermined law.
  • the device calculates the speed of the pump (therefore its flow) and the speed of the motor-fan unit, so as to ensure optimal regulation during the duration of this warm start state.
  • Means for establishing the warm start state of the engine advantageously comprise means for detecting the operation of the engine, at zero vehicle speed, and means for measuring or estimating a representative temperature of the engine thermal state and compare it to at least one given threshold.
  • This temperature representative of the thermal state of the engine is advantageously the temperature of the fluid leaving of the motor.
  • the invention advantageously provides that the branch of cooling further includes a pilot operated valve.
  • the second means are clean furthermore to adjust this piloted valve according to the fluid temperature.
  • the intermediate position of the valve controlled corresponding to a maximum temperature difference, which can be about 10 ° C.
  • the first threshold and the second temperature threshold defined previously can, for example, be respectively about 110 ° C and about 50 ° C.
  • FIG. 1 shows a device cooling coupled to a vehicle heat engine M automobile.
  • This device includes a cooling circuit 1 traversed by a cooling fluid, for example water with an antifreeze, such as glycol.
  • a cooling fluid for example water with an antifreeze, such as glycol.
  • This fluid can circulate under the action of a pump 2, called “electric pump”, powered by an electric motor variable regime.
  • Circuit 1 includes a branch of cooling 3 and a heating branch 4 in which the fluid circulates under the action of the electric pump 2.
  • the cooling branch 3 contains a radiator for cooling 5 associated with a motor-fan unit 6, which includes a propeller 7 driven in rotation by a variable speed electric motor.
  • Branch 3 contains in addition, upstream of the radiator 5, a controlled valve 8 also called “piloted thermostat", in particular a controlled valve either by a stepper type electric motor or by a heating element.
  • the heating branch 4 contains an air heater 9, again called “heating radiator”, part of a installation 10 for heating and / or air conditioning the passenger compartment of the vehicle.
  • the radiator 5 is suitable for being traversed by an air flow whose speed depends on the speed of the vehicle and that of of the motor-fan unit.
  • the heater 9 is suitable for crossed by an air flow set in motion by a blower (not shown) and suitable for distribution in the passenger compartment by suitable nozzles.
  • the device of the invention comprises a control module 11, also called a calculator, which can be produced by example, in the form of a microprocessor, or an ASIC.
  • This computer is connected by command lines L1, L2 and L3 respectively to the electric pump 2, to the motor-fan unit 6 and to the piloted valve.
  • This calculator determines, according to parameters which will be specified, the Np speed of pump 2 (which determines its flow), the speed Ng of the motor-fan unit 6 and the valve position Pv piloted 8. It takes into account one or more optimization laws contained in memory means.
  • the device of the invention aims to regulate the cooling engine in a particular state, called “state of hot start”, abbreviated as EDC, which can also be call restart state.
  • EDC state of hot start
  • the pump which sets in motion the fluid in the circuit is a pump mechanically coupled to the engine, so that the speed of the pump is proportional to that of the motor. It follows that, in a warm start state, the pump speed is not optimal.
  • the motor-fan unit is usually operated as a function of thermal switches, in direct relation to the temperature of the fluid measured in the circuit.
  • the computer makes it possible to manage the cooling of the engine in this particular state depending on specific parameters.
  • the device of the invention defines a strategy for control of the pump, the motor-fan unit and the piloted valve which calculates, based on certain data input, pump speed, speed of the fan-motor unit and the position of the piloted valve. This strategy complies with the law or the optimization laws of the computer.
  • the ambient air temperature Ta is taken outside the vehicle by an appropriate sensor.
  • the engine speed Nmot corresponds to the number of revolutions of the engine and is supplied, for example, by a computer injection.
  • the engine load Cmot is provided, for example, by the accelerator pedal position, the position of a carburetor throttle, etc.
  • the temperature of the fluid leaving the engine Te is supplied by an appropriate temperature sensor.
  • the heating position Dch is defined by a value in percentage of maximum heating demand.
  • This position can be provided directly by a manual adjustment, or from the temperature of setpoint and interior temperature in the case of a automatic heater / air conditioner.
  • this heating position can be between 0% (no heating demand) and 100% (maximum heating demand).
  • the computer 11 can also receive input data called "contact” to provide a signal that the engine is running and the vehicle speed is null (vehicle stopped).
  • the computer 11 includes calculation means 12 which determine by a comparator 13 if the motor M is in the state EDC hot start. For this, the engine must works, that is to say that its regime exceeds a threshold given, for example 400 rpm, that the speed of the vehicle is zero, and the temperature of the fluid Te is above ambient temperature, i.e. practically greater than a predefined threshold.
  • cooling is managed by other computing means 14 which correspond to a normal operating mode, and which do not not part of the invention.
  • the computer receives a signal corresponding to the value of the temperature of the fluid Te. It is a value instantaneous which, by hypothesis, is higher than the temperature room.
  • this instantaneous value Te is compared first at a first threshold value Te1 which is for example of the order of 110 ° C. This first comparison is made by a comparator 15.
  • the calculator takes into account counts the DCH heating demand at a comparator 16.
  • Another comparator 17 is provided at the output of the comparator 15. which compares the instantaneous value Te on the one hand with this first threshold Te1 and on the other hand to a second threshold Te2 which is itself less than Te1.
  • this threshold Te2 can be of the order of 50 ° C.
  • the computer adjusts the position of the piloted valve so that it provides a temperature difference DT which reaches a maximum value (DTmax) having a given value, for example 10 ° C.
  • Nsat the saturation regime of the pump which provides a saturation flow in the heater.
  • This saturation flow corresponds to the flow of the fluid which allows to obtain 90% of an asymptotic heat flux for a given air flow.
  • Figure 3 illustrates the variations in the FT heat flux as a function of the flow of the fluid Qf, the saturation flow being designated by Qsat.
  • valve position is adjusted so that the difference in temperature DT between the input and the output of the engine either less than or equal to DTmax, for example 10 ° C as in the previous case.
  • the engine is warmed up to that the temperature of the fluid reaches an optimal value.
  • the above organization chart defines laws which can be integrated into a computer by means in themselves known which are within the reach of man the job.
  • the computer may for example include means of memory with correspondence tables to fix the parameter values as a function of defined quantities.
  • the device of the invention thus allows, when a state of hot start is established, manage cooling under optimal conditions by acting on the pump, on the speed of the motor-fan unit and on the position of the piloted valve.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air-Conditioning For Vehicles (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Hybrid Electric Vehicles (AREA)

Abstract

A fluid goes through the cooling circuit (1) under the action of a pump (2). One circuit branch comprises a radiator (5) associated with a motoventilator group (6) and a second heating branch (4) comprises an aerotherm (9). Pump and motoventilator are controlled by a motor, which can work under a starting mode or an established mode following a law.

Description

L'invention concerne un dispositif de régulation du refroidissement d'un moteur thermique de véhicule automobile selon le préambule de la revendication 1. Un tel dispositif est connu du document EP-A-0 965 737.The invention relates to a cooling control device. of a motor vehicle heat engine according to the preamble of claim 1. Such a device is known from document EP-A-0 965 737.

Dans les véhicules automobiles actuels à moteur thermique, le dispositif de refroidissement comprend un circuit de refroidissement parcouru par un fluide, qui est généralement de l'eau additionnée d'un antigel. Ce circuit comprend une branche de refroidissement contenant un radiateur de refroidissement associé à un groupe moto-ventilateur, ainsi qu'une branche de chauffage contenant un aérotherme. Le radiateur de refroidissement est balayé par un flux d'air extérieur qui est mis en mouvement par la vitesse du véhicule et/ou par le groupe moto-ventilateur. La branche de refroidissement peut comporter également une vanne pilotée.In current motor vehicles with thermal engines, the cooling device includes a cooling circuit traversed by a fluid, which is generally of water with antifreeze added. This circuit includes a cooling branch containing a cooling radiator associated with a motor-fan unit, as well as a heating branch containing an air heater. The radiator cooling is swept by an outside air flow which is set in motion by the speed of the vehicle and / or by the motor-fan unit. The cooling branch can also include a pilot valve.

La branche de chauffage contient un aérotherme, c'est-à-dire un radiateur de chauffage qui est traversé par un flux d'air mis en mouvement par un pulseur. Ce flux d'air est ensuite envoyé et réparti dans l'habitacle par des buses de distribution appropriées. L'aérotherme fait partie d'une installation de chauffage et/ou climatisation à paramètres aérothermiques réglables.The heating branch contains an air heater, i.e. a heating radiator which is crossed by an air flow set in motion by a pulser. This air flow is then sent and distributed in the passenger compartment by distribution nozzles appropriate. The air heater is part of an installation heating and / or air conditioning with aerothermal parameters adjustable.

Il arrive très souvent que le débit de fluide dans l'aérotherme, est insuffisant pour assurer une bonne efficacité d'échange thermique, et donc insuffisant pour assurer le chauffage de l'habitacle, notamment lorsque le moteur tourne au ralenti. It very often happens that the flow of fluid in the heater, is insufficient to ensure good heat exchange efficiency, and therefore insufficient to heat the passenger compartment, especially when the engine idles.

L'invention a notamment pour but de surmonter les inconvénients précités.The object of the invention is in particular to overcome the drawbacks supra.

Elle vise en particulier à réguler le refroidissement du moteur thermique dans un état de démarrage du moteur à chaud, que l'on peut appeler aussi état de redémarrage.It aims in particular to regulate the cooling of the heat engine in a hot engine start state, which can also be called restart state.

L'invention propose à cet effet un dispositif selon la revendication 1.The invention provides for this purpose a device according to claim 1.

Ainsi, le dispositif de l'invention détermine d'abord si le moteur est dans un état de démarrage à chaud et, si c'est le cas, il pilote le régime de la pompe et/ou le régime du groupe moto-ventilateur dans des conditions choisies, c'est-à-dire en fonction d'au moins une loi prédéterminée.Thus, the device of the invention first determines whether the engine is in a warm start state and, if this is the case, it controls the pump speed and / or the group speed motor-ventilator under selected conditions, i.e. according to at least one predetermined law.

En particulier, le dispositif calcule le régime de la pompe (donc son débit) et le régime du groupe moto-ventilateur, de manière à assurer une régulation optimale pendant la durée de cet état de démarrage à chaud.In particular, the device calculates the speed of the pump (therefore its flow) and the speed of the motor-fan unit, so as to ensure optimal regulation during the duration of this warm start state.

Les moyens pour établir l'état de démarrage à chaud du moteur comprennent avantageusement des moyens pour détecter le fonctionnement du moteur, à vitesse nulle du véhicule, et des moyens pour mesurer ou estimer une température représentative de l'état thermique du moteur et la comparer à au moins un seuil donné.Means for establishing the warm start state of the engine advantageously comprise means for detecting the operation of the engine, at zero vehicle speed, and means for measuring or estimating a representative temperature of the engine thermal state and compare it to at least one given threshold.

Cette température représentative de l'état thermique du moteur est avantageusement la température du fluide en sortie du moteur.This temperature representative of the thermal state of the engine is advantageously the temperature of the fluid leaving of the motor.

Dans une forme de réalisation préférée de l'invention, les seconds moyens sont propres à :

  • soit piloter le groupe moto-ventilateur à un régime minimal si la température du fluide est supérieure à un premier seuil ;
  • sinon, stopper le groupe moto-ventilateur si la température du fluide est inférieure à ce premier seuil et supérieure à un deuxième seuil.
In a preferred embodiment of the invention, the second means are suitable for:
  • either control the motor-fan unit at minimum speed if the fluid temperature is above a first threshold;
  • otherwise, stop the fan motor unit if the fluid temperature is below this first threshold and above a second threshold.

Dans cette forme de réalisation préférée, les seconds moyens sont en outre propres à:

  • soit piloter la pompe à un régime minimal si la demande de chauffage est nulle ;
  • sinon, piloter la pompe en fonction d'un régime de saturation, si la demande de chauffage est positive.
In this preferred embodiment, the second means are further suitable for:
  • either control the pump at minimum speed if the heating demand is zero;
  • otherwise, control the pump according to a saturation regime, if the heating demand is positive.

L'invention prévoit avantageusement que la branche de refroidissement comprend en outre une vanne pilotée. En ce cas, il est avantageux que les seconds moyens soient propres en outre à régler cette vanne pilotée en fonction de la température du fluide.The invention advantageously provides that the branch of cooling further includes a pilot operated valve. In this case, it is advantageous that the second means are clean furthermore to adjust this piloted valve according to the fluid temperature.

Plus particulièrement, on prévoit avantageusement que ces seconds moyens sont propres à :

  • soit régler la vanne pilotée dans une position intermédiaire fournissant un écart de température donné du fluide entre l'entrée et la sortie du moteur, lorsque la température du fluide est supérieure à un premier seuil ;
  • sinon, fermer la vanne pilotée si la température du fluide est inférieure à ce premier seuil et supérieure à un deuxième seuil.
More particularly, it is advantageously provided that these second means are suitable for:
  • either set the piloted valve to an intermediate position providing a given temperature difference of the fluid between the inlet and the outlet of the engine, when the temperature of the fluid is greater than a first threshold;
  • otherwise, close the piloted valve if the fluid temperature is below this first threshold and above a second threshold.

Avantageusement, la position intermédiaire de la vanne pilotée correspondant à un écart de température maximal, lequel peut être d'environ 10°C.Advantageously, the intermediate position of the valve controlled corresponding to a maximum temperature difference, which can be about 10 ° C.

Le premier seuil et le second seuil de température définis précédemment peuvent, à titre d'exemple, être respectivement d'environ 110°C et d'environ 50°C.The first threshold and the second temperature threshold defined previously can, for example, be respectively about 110 ° C and about 50 ° C.

Dans la description qui suit, faite seulement à titre d'exemple, on se réfère aux dessins annexés, sur lesquels :

  • la figure 1 est un schéma illustrant un moteur thermique couplé à une installation de chauffage d'un habitacle de véhicule, ainsi qu'à un dispositif de refroidissement selon l'invention ;
  • la figure 2 est un organigramme de fonctionnement du dispositif dans une forme de réalisation ; et
  • la figure 3 est une courbe illustrant les variations du débit de saturation de la pompe dans l'aérotherme de l'installation de chauffage.
In the description which follows, given solely by way of example, reference is made to the appended drawings, in which:
  • Figure 1 is a diagram illustrating a heat engine coupled to a heating installation of a vehicle interior, as well as a cooling device according to the invention;
  • Figure 2 is a flowchart of operation of the device in one embodiment; and
  • FIG. 3 is a curve illustrating the variations in the saturation flow rate of the pump in the air heater of the heating installation.

On se réfère d'abord à la figure 1 qui montre un dispositif de refroidissement couplé à un moteur thermique M de véhicule automobile. Ce dispositif comprend un circuit de refroidissement 1 parcouru par un fluide de refroidissement, par exemple de l'eau additionnée d'un antigel, tel que du glycol. Ce fluide peut circuler sous l'action d'une pompe 2, appelée "pompe électrique", actionnée par un moteur électrique à régime variable. Le circuit 1 comprend une branche de refroidissement 3 et une branche de chauffage 4 dans lesquelles circule le fluide sous l'action de la pompe électrique 2.We first refer to Figure 1 which shows a device cooling coupled to a vehicle heat engine M automobile. This device includes a cooling circuit 1 traversed by a cooling fluid, for example water with an antifreeze, such as glycol. This fluid can circulate under the action of a pump 2, called "electric pump", powered by an electric motor variable regime. Circuit 1 includes a branch of cooling 3 and a heating branch 4 in which the fluid circulates under the action of the electric pump 2.

La branche de refroidissement 3 contient un radiateur de refroidissement 5 associé à un groupe moto-ventilateur 6, lequel comprend une hélice 7 entraínée en rotation par un moteur électrique à régime variable. La branche 3 contient en outre, en amont du radiateur 5, une vanne pilotée 8 encore appelée "thermostat piloté", notamment une vanne commandée soit par un moteur électrique de type pas à pas, soit par un élément chauffant.The cooling branch 3 contains a radiator for cooling 5 associated with a motor-fan unit 6, which includes a propeller 7 driven in rotation by a variable speed electric motor. Branch 3 contains in addition, upstream of the radiator 5, a controlled valve 8 also called "piloted thermostat", in particular a controlled valve either by a stepper type electric motor or by a heating element.

La branche de chauffage 4 contient un aérotherme 9, encore appelé "radiateur de chauffage", faisant partie d'une installation 10 de chauffage et/ou climatisation de l'habitacle du véhicule.The heating branch 4 contains an air heater 9, again called "heating radiator", part of a installation 10 for heating and / or air conditioning the passenger compartment of the vehicle.

Le radiateur 5 est propre à être traversé par un flux d'air dont la vitesse dépend de la vitesse du véhicule et de celle du groupe moto-ventilateur. L'aérotherme 9 est propre à être traversé par un flux d'air mis en mouvement par un pulseur (non représenté) et propre à être ensuite distribué dans l'habitacle par des buses appropriées.The radiator 5 is suitable for being traversed by an air flow whose speed depends on the speed of the vehicle and that of of the motor-fan unit. The heater 9 is suitable for crossed by an air flow set in motion by a blower (not shown) and suitable for distribution in the passenger compartment by suitable nozzles.

Le dispositif de l'invention comprend un module de commande 11, encore appelé calculateur, qui peut être réalisé, par exemple, sous la forme d'un microprocesseur, ou d'un ASIC. Ce calculateur est relié par des lignes de commande L1, L2 et L3 respectivement à la pompe électrique 2, au groupe moto-ventilateur 6 et à la vanne pilotée. Ce calculateur détermine, en fonction de paramètres qui vont être précisés, le régime Np de la pompe 2 (qui détermine son débit), le régime Ng du groupe moto-ventilateur 6 et la position Pv de la vanne pilotée 8. Il tient compte d'une ou plusieurs lois d'optimisation contenues dans des moyens de mémoire.The device of the invention comprises a control module 11, also called a calculator, which can be produced by example, in the form of a microprocessor, or an ASIC. This computer is connected by command lines L1, L2 and L3 respectively to the electric pump 2, to the motor-fan unit 6 and to the piloted valve. This calculator determines, according to parameters which will be specified, the Np speed of pump 2 (which determines its flow), the speed Ng of the motor-fan unit 6 and the valve position Pv piloted 8. It takes into account one or more optimization laws contained in memory means.

Le dispositif de l'invention vise à réguler le refroidissement du moteur dans un état particulier, dit "état de démarrage à chaud", en abrégé EDC, que l'on peut aussi appeler état de redémarrage. Dans cet état de fonctionnement, le moteur est démarré à nouveau alors qu'il est encore chaud et que la vitesse du véhicule est nulle (véhicule à l'arrêt). Dans les dispositifs de refroidissement classiques, la pompe qui met en mouvement le fluide dans le circuit est une pompe mécanique couplée au moteur, si bien que le régime de la pompe est proportionnel à celui du moteur. Il en résulte que, dans un état de démarrage à chaud, le régime de la pompe n'est pas optimal.The device of the invention aims to regulate the cooling engine in a particular state, called "state of hot start ", abbreviated as EDC, which can also be call restart state. In this operating state, engine is started again while still warm and that the vehicle speed is zero (vehicle stationary). In conventional cooling devices, the pump which sets in motion the fluid in the circuit is a pump mechanically coupled to the engine, so that the speed of the pump is proportional to that of the motor. It follows that, in a warm start state, the pump speed is not optimal.

De même, dans les dispositifs connus, le groupe moto-ventilateur est actionné habituellement en fonction de thermocontacts, en relation directe de la température du fluide mesuré dans le circuit.Likewise, in known devices, the motor-fan unit is usually operated as a function of thermal switches, in direct relation to the temperature of the fluid measured in the circuit.

Dans l'invention, le calculateur permet de gérer le refroidissement du moteur dans cet état particulier en fonction de paramètres spécifiques.In the invention, the computer makes it possible to manage the cooling of the engine in this particular state depending on specific parameters.

Le dispositif de l'invention définit une stratégie de pilotage de la pompe, du groupe moto-ventilateur et de la vanne pilotée qui calcule, en fonction de certaines données d'entrée, le régime de la pompe, le régime du groupe moto-ventilateur et la position de la vanne pilotée. Cette stratégie est conforme à la loi ou aux lois d'optimisation du calculateur.The device of the invention defines a strategy for control of the pump, the motor-fan unit and the piloted valve which calculates, based on certain data input, pump speed, speed of the fan-motor unit and the position of the piloted valve. This strategy complies with the law or the optimization laws of the computer.

Dans ce qui suit, on part de l'hypothèse que la branche de chauffage 4 ne comporte pas de vanne de régulation et que la gestion du pulseur (non représenté) associé à l'aérotherme 9 n'est pas prise en compte.In what follows, we start from the assumption that the branch of heater 4 does not have a control valve and that the management of the blower (not shown) associated with the air heater 9 is not taken into account.

Dans l'exemple, les données d'entrée du calculateur 11 (figure 1) sont les mesures des grandeurs suivantes :

  • température de l'air ambiant : Ta,
  • régime du moteur : Nmot
  • charge du moteur : Cmot,
  • température du fluide (eau) en sortie du moteur : Te,
  • position de chauffage : Dch, et
  • contact du moteur.
In the example, the input data of the computer 11 (FIG. 1) are the measurements of the following quantities:
  • ambient air temperature: Ta,
  • engine speed: Nmot
  • motor load: Cmot,
  • temperature of the fluid (water) leaving the engine: Te,
  • heating position: Dch, and
  • engine contact.

La température de l'air ambiant Ta est prise à l'extérieur du véhicule par un capteur approprié.The ambient air temperature Ta is taken outside the vehicle by an appropriate sensor.

Le régime du moteur Nmot correspond au nombre de tours du moteur et est fourni, par exemple, par un calculateur d'injection.The engine speed Nmot corresponds to the number of revolutions of the engine and is supplied, for example, by a computer injection.

La charge du moteur Cmot est fournie, par exemple, par la position de la pédale d'accélérateur, la position d'un papillon de carburateur, etc.The engine load Cmot is provided, for example, by the accelerator pedal position, the position of a carburetor throttle, etc.

La température du fluide en sortie du moteur Te est fournie par un capteur de température approprié.The temperature of the fluid leaving the engine Te is supplied by an appropriate temperature sensor.

La position de chauffage Dch est définie par une valeur en pourcentage de la demande de chauffage maximale.The heating position Dch is defined by a value in percentage of maximum heating demand.

Cette position peut être fournie directement par un organe de réglage manuel, ou bien à partir de la température de consigne et de la température de l'habitacle dans le cas d'un appareil de chauffage/climatisation automatique.This position can be provided directly by a manual adjustment, or from the temperature of setpoint and interior temperature in the case of a automatic heater / air conditioner.

Par conséquent, cette position de chauffage peut être comprise entre 0% (pas de demande de chauffage) et 100% (demande de chauffage maximal).Therefore, this heating position can be between 0% (no heating demand) and 100% (maximum heating demand).

Le calculateur 11 peut recevoir aussi une donnée d'entrée appelée "contact" pour fournir un signal indiquant que le moteur thermique fonctionne et que la vitesse du véhicule est nulle (véhicule à l'arrêt).The computer 11 can also receive input data called "contact" to provide a signal that the engine is running and the vehicle speed is null (vehicle stopped).

On se réfère maintenant à l'organigramme de la figure 2 pour décrire le fonctionnement du calculateur 11 qui pilote la pompe électrique 2, le groupe moto-ventilateur 6 et la vanne pilotée 8. We now refer to the flowchart of Figure 2 for describe the operation of the computer 11 which controls the electric pump 2, the motor-fan unit 6 and the valve piloted 8.

Le calculateur 11 comprend des moyens de calcul 12 qui déterminent par un comparateur 13 si le moteur M est à l'état de démarrage à chaud EDC. Pour cela, il faut que le moteur fonctionne, c'est-à-dire que son régime dépasse un seuil donné, par exemple de 400 tours/minute, que la vitesse du véhicule soit nulle, et que la température du fluide Te soit supérieure à la température ambiante, c'est-à-dire pratiquement supérieure à un seuil prédéfini.The computer 11 includes calculation means 12 which determine by a comparator 13 if the motor M is in the state EDC hot start. For this, the engine must works, that is to say that its regime exceeds a threshold given, for example 400 rpm, that the speed of the vehicle is zero, and the temperature of the fluid Te is above ambient temperature, i.e. practically greater than a predefined threshold.

Si la comparaison est négative, c'est-à-dire si le moteur n'est pas dans l'état de démarrage à chaud EDC, le refroidissement est géré par d'autres moyens de calcul 14 qui correspondent à un mode de fonctionnement normal, et qui ne font pas partie de l'invention.If the comparison is negative, i.e. if the engine is not in EDC hot start state, cooling is managed by other computing means 14 which correspond to a normal operating mode, and which do not not part of the invention.

Par contre, si la comparaison est positive, un état de démarrage à chaud EDC est détecté.On the other hand, if the comparison is positive, a state of EDC hot start is detected.

En ce cas, le calculateur reçoit un signal correspondant à la valeur de la température du fluide Te. Il s'agit d'une valeur instantanée qui, par hypothèse, est supérieure à la température ambiante.In this case, the computer receives a signal corresponding to the value of the temperature of the fluid Te. It is a value instantaneous which, by hypothesis, is higher than the temperature room.

Dans l'exemple, cette valeur instantanée Te est comparée d'abord à une première valeur seuil Te1 qui est par exemple de l'ordre de 110°C. Cette première comparaison est effectuée par un comparateur 15.In the example, this instantaneous value Te is compared first at a first threshold value Te1 which is for example of the order of 110 ° C. This first comparison is made by a comparator 15.

Si le résultat de cette comparaison est positif, c'est-à-dire si Te est supérieur à Te1, alors le calculateur prend en compte la demande de chauffage DCH au niveau d'un comparateur 16.If the result of this comparison is positive, i.e. if Te is greater than Te1, then the calculator takes into account counts the DCH heating demand at a comparator 16.

En sortie du comparateur 15 est prévu un autre comparateur 17 qui compare la valeur instantanée Te d'une part à ce premier seuil Te1 et d'autre part à un deuxième seuil Te2 qui est lui-même inférieur à Te1. A titre d'exemple, ce seuil Te2 peut être de l'ordre de 50°C. Another comparator 17 is provided at the output of the comparator 15. which compares the instantaneous value Te on the one hand with this first threshold Te1 and on the other hand to a second threshold Te2 which is itself less than Te1. As an example, this threshold Te2 can be of the order of 50 ° C.

Si la comparaison est positive, c'est-à-dire s'il s'avère que Te est compris entre Te2 et Te1, alors le calculateur prend en compte la demande de chauffage au niveau d'un autre comparateur 18.If the comparison is positive, i.e. if it turns out that Te is between Te2 and Te1, so the calculator takes take into account the heating demand at another level comparator 18.

Le comparateur 16 prend en compte la demande de chauffage. S'il n'y a aucune demande de chauffage (position de chauffage = 0), alors le calculateur établit les conditions de fonctionnement suivantes :

  • il pilote le groupe moto-ventilateur pour que son régime soit minimal, en sorte que l'on ait Ng = Ngmin.
Comparator 16 takes into account the heating demand. If there is no heating demand (heating position = 0), then the computer establishes the following operating conditions:
  • it controls the motor-fan group so that its speed is minimal, so that we have Ng = Ngmin.

Il pilote également la pompe pour que son régime soit minimal, en sorte que l'on ait Np = Npmin.He also controls the pump so that his speed is minimal, so that we have Np = Npmin.

De même, le calculateur règle la position de la vanne pilotée de manière qu'elle fournisse un écart de température DT qui atteigne une valeur maximale (DTmax) ayant une valeur donnée, par exemple de 10°C.Similarly, the computer adjusts the position of the piloted valve so that it provides a temperature difference DT which reaches a maximum value (DTmax) having a given value, for example 10 ° C.

Si la demande de chauffage est positive, le calculateur pilote alors le dispositif dans les conditions suivantes :

  • régime du groupe moto-ventilateur réglé au minimum, à savoir Ng = Ngmin, et
  • régime de la pompe proportionnel à un régime de saturation, à savoir Np = Nsat.
If the heating demand is positive, the computer then controls the device under the following conditions:
  • speed of the fan-motor unit set to minimum, namely Ng = Ngmin, and
  • pump speed proportional to a saturation speed, namely Np = Nsat.

On appelle ici régime de saturation Nsat le régime de la pompe qui permet d'obtenir un débit de saturation dans l'aérotherme. Ce débit de saturation correspond au débit du fluide qui permet d'obtenir 90 % d'un flux thermique asymptotique pour un débit d'air donné. La figure 3 illustre les variations du flux thermique FT en fonction du débit du fluide Qf, le débit de saturation étant désigné par Qsat. We call here the saturation regime Nsat the regime of the pump which provides a saturation flow in the heater. This saturation flow corresponds to the flow of the fluid which allows to obtain 90% of an asymptotic heat flux for a given air flow. Figure 3 illustrates the variations in the FT heat flux as a function of the flow of the fluid Qf, the saturation flow being designated by Qsat.

La position de la vanne est réglée pour que la différence de température DT entre l'entrée et la sortie du moteur soit inférieure ou égale à DTmax, par exemple 10°C comme dans le cas précédent.The valve position is adjusted so that the difference in temperature DT between the input and the output of the engine either less than or equal to DTmax, for example 10 ° C as in the previous case.

Ainsi, dans les deux cas ci-dessus, le moteur va se refroidir jusqu'à ce que la température du fluide descende et atteigne une valeur optimale.So in the two cases above, the engine will cool down until the fluid temperature drops and reaches an optimal value.

Le comparateur 18 prend en compte également la demande de chauffage. S'il n'y a pas de demande de chauffage, le calculateur pilote le dispositif dans les conditions suivantes :

  • régime de la pompe Np établi à une valeur minimale Npmin, et
  • régime du groupe moto-ventilateur établi à une valeur nulle (ventilateur arrêté).
  • position de la vanne = 0, ce qui correspond à la fermeture de la vanne pilotée.
Comparator 18 also takes into account the heating demand. If there is no heating demand, the computer controls the device under the following conditions:
  • pump speed Np set to a minimum value Npmin, and
  • speed of the motor-fan unit set to zero (fan stopped).
  • valve position = 0, which corresponds to closing the piloted valve.

S'il y a une demande de chauffage, le comparateur 18 pilote le dispositif dans les conditions suivantes :

  • régime du groupe moto-ventilateur nul,
  • régime de la pompe Np fixé à la valeur de saturation Nsat, et
  • position de la vanne pilotée nulle, c'est-à-dire fermeture de la vanne pilotée.
If there is a heating demand, the comparator 18 controls the device under the following conditions:
  • speed of the fan-motor group zero,
  • pump speed Np fixed at the saturation value Nsat, and
  • position of the piloted valve zero, i.e. closing of the piloted valve.

Dans les deux derniers cas, le moteur est réchauffé jusqu'à ce que la température du fluide atteigne une valeur optimale.In the last two cases, the engine is warmed up to that the temperature of the fluid reaches an optimal value.

On comprendra que l'organigramme ci-dessus définit des lois qui peuvent être intégrées dans un calculateur par des moyens en eux-mêmes connus qui sont à la portée de l'homme du métier. Le calculateur peut comprendre par exemple des moyens de mémoire avec des tables de correspondance pour fixer les valeurs des paramètres en fonction de grandeurs définies.It will be understood that the above organization chart defines laws which can be integrated into a computer by means in themselves known which are within the reach of man the job. The computer may for example include means of memory with correspondence tables to fix the parameter values as a function of defined quantities.

Le dispositif de l'invention permet ainsi, lorsqu'un état de démarrage à chaud est établi, de gérer le refroidissement dans des conditions optimales en agissant sur le régime de la pompe, sur le régime du groupe moto-ventilateur et sur la position de la vanne pilotée.The device of the invention thus allows, when a state of hot start is established, manage cooling under optimal conditions by acting on the pump, on the speed of the motor-fan unit and on the position of the piloted valve.

Ces paramètres sont calculés en fonction essentiellement de la température instantanée du fluide dans le circuit de refroidissement et de la demande de chauffage telle que .formulée par le ou les passagers du véhicule.These parameters are calculated mainly as a function of the instantaneous temperature of the fluid in the circuit cooling and heating demand such as .formulated by the passenger (s) of the vehicle.

Claims (10)

  1. Device for regulating the cooling of a motor vehicle combustion engine, of the type comprising a cooling circuit (1) traversed by a fluid under the action of a pump (2), this circuit comprising a cooling branch (3) containing a cooling radiator (5) associated with an electric fan assembly (6), as well as a heating branch (4) containing a unit heater (9), the pump (2) and the electric fan assembly (6) each being actuated by a variable-speed electric motor, characterized in that it comprises:
    first means (11) for establishing a hot startup state (EDC) of the engine as a function of the chosen conditions; and
    second means (11), active in this hot startup state for, as a function of a first quantity representative of the temperature of the fluid (Te) and of a second quantity representative of the heating demand (Dch), controlling the speed (Np) of the pump (2) and the speed (Ng) of the electric fan assembly (6) under chosen conditions taking account of at least one predetermined law.
  2. Device according to Claim 1, characterized in that the means for establishing the hot startup state (EDC) of the engine (M) comprise means for detecting the operation of the engine, at zero speed of the vehicle, and means for measuring or estimating a temperature (Te) representative of the thermal state of the engine and comparing it with at least one given threshold (Te1, Te2).
  3. Device according to Claim 2, characterized in that the temperature (Te) representative of the thermal state of the engine is the temperature of the fluid at the outlet of the engine.
  4. Device according to one of Claims 1 to 3, characterized in that the second means (11) are able to:
    either operate the electric fan assembly (6) at a minimum speed (Ngmin) if the temperature of the fluid (Te) is above a first threshold (Te1);
    otherwise, stop the electric fan assembly (6) if the temperature of the fluid (Te) is below this first threshold (Te1) and above a second threshold (Te2).
  5. Device according to one of Claims 1 to 4, characterized in that the second means (11) are able to:
    either operate the pump (2) at a minimum speed (Npmin) if the heating demand (Dch)is zero;
    otherwise, operate the pump (2) as a function of a saturation speed (Nsat), if the heating demand (Dch) is positive.
  6. Device according to one of Claims 1 to 5, characterized in that the cooling branch (3) furthermore comprises a controlled gate (8), and in that the second means are able furthermore to adjust the controlled gate (8) as a function of the temperature of the fluid (Te).
  7. Device according to Claim 6, characterized in that the second means are able to:
    either adjust the controlled gate (8) into an intermediate position providing a given temperature difference (DT) of the fluid between the inlet and the outlet of the engine, when the temperature of the fluid (Te) is above a first threshold (Te1);
    otherwise, close the controlled gate (8) if the temperature of the fluid (Te) is below this first threshold (Te1) and above a second threshold (Te2).
  8. Device according to Claim 7, characterized in that the intermediate position of the controlled gate (8) corresponds to a maximum temperature difference (DTmax).
  9. Device according to Claim 8, characterized in that the maximum temperature difference (DT max) is around 10°C.
  10. Device according to one of Claims 4 and 7, characterized in that the first threshold (Te1) is around 110°C and the second threshold (Te2) around 50°C.
EP00128308A 1999-12-30 2000-12-22 Cooling control device of an internal combustion engine of a vehicle during hot start Expired - Lifetime EP1113157B1 (en)

Applications Claiming Priority (2)

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FR9916769 1999-12-30
FR9916769A FR2803334B1 (en) 1999-12-30 1999-12-30 DEVICE FOR REGULATING THE COOLING OF A MOTOR VEHICLE ENGINE IN A HOT START STATE

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EP1113157B1 true EP1113157B1 (en) 2004-08-18

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FR2803334B1 (en) 2002-03-22
US20010017110A1 (en) 2001-08-30
FR2803334A1 (en) 2001-07-06
EP1113157A1 (en) 2001-07-04
ATE274137T1 (en) 2004-09-15
US6470838B2 (en) 2002-10-29
DE60013082D1 (en) 2004-09-23

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