EP2959142A1 - Method and device for heating fuel for an internal combustion engine - Google Patents

Method and device for heating fuel for an internal combustion engine

Info

Publication number
EP2959142A1
EP2959142A1 EP14710019.2A EP14710019A EP2959142A1 EP 2959142 A1 EP2959142 A1 EP 2959142A1 EP 14710019 A EP14710019 A EP 14710019A EP 2959142 A1 EP2959142 A1 EP 2959142A1
Authority
EP
European Patent Office
Prior art keywords
fuel
vehicle
temperature
engine
heating
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Withdrawn
Application number
EP14710019.2A
Other languages
German (de)
French (fr)
Inventor
David Gerard
Fano Rampanarivo
Pascal Emery
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.)
Renault SAS
Original Assignee
Renault SAS
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 Renault SAS filed Critical Renault SAS
Publication of EP2959142A1 publication Critical patent/EP2959142A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
    • F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
    • F02D41/064—Introducing corrections for particular operating conditions for engine starting or warming up for starting at cold start
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/08—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of electric propulsion units, e.g. motors or generators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W20/00—Control systems specially adapted for hybrid vehicles
    • B60W20/10—Controlling the power contribution of each of the prime movers to meet required power demand
    • B60W20/15—Control strategies specially adapted for achieving a particular effect
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
    • B60W30/18—Propelling the vehicle
    • B60W30/192—Mitigating problems related to power-up or power-down of the driveline, e.g. start-up of a cold engine
    • B60W30/194—Mitigating problems related to power-up or power-down of the driveline, e.g. start-up of a cold engine related to low temperature conditions, e.g. high viscosity of hydraulic fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
    • F02D29/02—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M31/00—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture
    • F02M31/02—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating
    • F02M31/16—Other apparatus for heating fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • F02N11/08—Circuits or control means specially adapted for starting of engines
    • F02N11/0814—Circuits or control means specially adapted for starting of engines comprising means for controlling automatic idle-start-stop
    • F02N11/0818—Conditions for starting or stopping the engine or for deactivating the idle-start-stop mode
    • F02N11/0833—Vehicle conditions
    • F02N11/0837—Environmental conditions thereof, e.g. traffic, weather or road conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N19/00—Starting aids for combustion engines, not otherwise provided for
    • F02N19/02—Aiding engine start by thermal means, e.g. using lighted wicks
    • F02N19/04—Aiding engine start by thermal means, e.g. using lighted wicks by heating of fluids used in engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • B60K2001/003—Arrangement or mounting of electrical propulsion units with means for cooling the electrical propulsion units
    • B60K2001/005—Arrangement or mounting of electrical propulsion units with means for cooling the electrical propulsion units the electric storage means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/24—Energy storage means
    • B60W2510/242—Energy storage means for electrical energy
    • B60W2510/246—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2530/00—Input parameters relating to vehicle conditions or values, not covered by groups B60W2510/00 or B60W2520/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2710/00—Output or target parameters relating to a particular sub-units
    • B60W2710/08—Electric propulsion units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/04—Engine intake system parameters
    • F02D2200/0414—Air temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0606—Fuel temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N2200/00—Parameters used for control of starting apparatus
    • F02N2200/12—Parameters used for control of starting apparatus said parameters being related to the vehicle exterior
    • F02N2200/122—Atmospheric temperature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Definitions

  • the present invention relates to the heating of fuel consumed by an internal combustion engine.
  • a fuel heating process at the start of a vehicle engine in which the fuel temperature and the temperature outside the vehicle are compared to a first threshold below which the starting of the vehicle is prohibited , and at a second threshold greater than the first, beyond which the engine starts without reheating the fuel.
  • It also relates to a fuel heating device between the fuel tank and the engine of a vehicle, and a hybrid vehicle equipped with this device.
  • This invention finds a preferred application, but not exclusive, on a hybrid vehicle, combining an electric motor and a heat engine.
  • the intake of calories at the start of the engine must be sufficient to limit the waxing of the fuel and avoid clogging of the diesel filter, which generates pressure drops in the feed ramp, which can cause instabilities, stalls or even refusal to start.
  • the heating of the diesel can be based on the recovery of the calories provided by the injection system.
  • the principle is to circulate the short-loop fuel to the inlet of the diesel filter.
  • Another known solution is based on the supply of calories via an electric heater installed on the fuel circuit.
  • the principle consists of generating thermal energy by supplying a conductive material with electric current.
  • Publication FR 2 481 751 describes in particular a fuel supply network for a diesel engine, comprising a fuel heating device, powered by the vehicle battery, between the pump and the engine injection system.
  • the present invention aims to take advantage of the large amounts of heat released in operation by hybrid vehicle traction batteries, to help heat the engine during its startup phase.
  • the fuel is heated by heat exchange with the vehicle battery cooling circuit, when the outside temperature is between two temperature thresholds.
  • the heating of the fuel is interrupted as soon as the outside temperature outside temperature, or the fuel temperature exceeds the upper second.
  • the fuel is heated in passing by a heat exchanger traversed by the cooling water circuit of a battery of the vehicle.
  • the hybrid architecture of the diagram includes a heat engine 1 and its fuel supply circuit 2.
  • An electric traction machine 3 is coupled, or not (by coupling means not shown) to the heat engine 1 and to the transmission 4 of the vehicle.
  • An electric traction battery 6 makes it possible to supply the electric machine 3 with electricity. It is connected to a heat exchanger 7 by a cooling circuit 8. All the components of the architecture are controlled by a supervisor 9.
  • the circuit of main fuel, between the fuel tank 11 and the heat engine 2 passes through the heat exchanger 7. It has a bypass branch 2a around it.
  • the device comprises a plurality of sensors (not shown), including a fuel temperature sensor, an outdoor temperature sensor, and a battery coolant temperature sensor.
  • the signals of all the sensors are received by the supervisor 9.
  • the set is controlled as follows. In normal operation, the heat engine 1, the electric traction machine 3, and their respective fuel and electricity supplies, are controlled by the supervisor 9.
  • T_GO_liml T_ext ⁇ T_GO_liml
  • the supervisor also chooses a second threshold of fuel temperature T GO lim2, higher than the outside temperature.
  • T GO lirai ⁇ T outside ⁇ T GO lim2 two situations are distinguished.
  • the propulsion of the vehicle can be done either in electric mode or in thermal mode, depending on the decision of the supervisor and other conditions Operating.
  • the cooling water of the battery circulates in its cooling circuit.
  • the control of the cooling is done through a water temperature sensor for example.
  • the fuel temperature sensor measures the temperature of the fuel in the fuel supply circuit of the engine. In this zone, the fuel generally needs to be warmed up to start, because the fuel temperature is in principle equal to the outside temperature at the start of the vehicle.
  • the exchanger is functional, and calories are exchanged between the cooling circuit and the fuel supply circuit. The fuel is heated by this heat exchange, and the start of the engine is facilitated.
  • the heating of the fuel is interrupted as soon as the outside temperature, or the temperature of the fuel exceeds the second threshold:
  • the fuel temperature and the temperature outside the vehicle are compared to a first threshold below which the vehicle starts. is prohibited, and at a second threshold higher than the first, above which the engine starts without reheating the fuel. Between the two thresholds, the fuel is heated by heat exchange with the vehicle battery cooling circuit.
  • the exchanger between the battery cooling circuit and the fuel supply circuit of the heat engine can also exchange heat on the hot part of the fuel circuit (not shown in the diagram), which corresponds to the return circuit to the engine.
  • the fuel return circuit then passes through the heat exchanger, so that the heat exchanger is also usable to limit the reheating of the fuel on its return to the tank, at the outlet of the injectors or the high pressure pump.
  • a hybrid vehicle illustrated in a non-limiting manner by the diagram, comprising at least one heat engine 1 and an electric machine 3 powered by a traction battery provided with a cooling water circuit
  • the latter can move using only its electric propulsion source 3, as long as the fuel temperature is below the second threshold.
  • the engine is then started running, when the fuel temperature reaches this threshold.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Automation & Control Theory (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Atmospheric Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Toxicology (AREA)
  • Hybrid Electric Vehicles (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)

Abstract

Method for heating fuel upon start-up of a hybrid vehicle combustion engine (1), in which method the temperature of the fuel (T_GO) and the temperature outside the vehicle (T_ext) are compared against a first threshold (T_GO_liml) below which the starting of the vehicle is forbidden, and against a second threshold (T_GO_lim2) higher than the first and above which the engine will start without the fuel being heated, characterized in that the fuel is heated by exchange of heat with the cooling circuit (8) for the vehicle battery (6) when the external temperature (T_ext) is comprised between the two thresholds (T_GO_liml, T_GO_lim2).

Description

PROCEDE ET DISPOSITIF DE RECHAUFFAGE DE CARBURANT POUR MOTEUR A COMBUSTION INTERNE  METHOD AND DEVICE FOR FUEL HEATING FOR INTERNAL COMBUSTION ENGINE
La présente invention concerne le chauffage du carburant consommé par un moteur à combustion interne. The present invention relates to the heating of fuel consumed by an internal combustion engine.
Plus précisément, elle a pour objet un procédé de réchauffage du carburant au démarrage d'un moteur thermique de véhicule, dans lequel la température du carburant et la température extérieure au véhicule sont comparées à un premier seuil en dessous duquel le démarrage du véhicule est interdit, et à un second seuil supérieur au premier, au-delà duquel le moteur démarre sans réchauffage du carburant .  More specifically, it relates to a fuel heating process at the start of a vehicle engine, in which the fuel temperature and the temperature outside the vehicle are compared to a first threshold below which the starting of the vehicle is prohibited , and at a second threshold greater than the first, beyond which the engine starts without reheating the fuel.
Elle a également pour objet un dispositif de réchauffage de carburant entre le réservoir de carburant et le moteur thermique d'un véhicule, et un véhicule hybride équipé ce dispositif.  It also relates to a fuel heating device between the fuel tank and the engine of a vehicle, and a hybrid vehicle equipped with this device.
Cette invention trouve une application privilégiée, mais non exclusive, sur un véhicule hybride, associant un moteur électrique et un moteur thermique.  This invention finds a preferred application, but not exclusive, on a hybrid vehicle, combining an electric motor and a heat engine.
Lors des démarrages à froid des moteurs thermiques, il peut être nécessaire d'apporter des calories au carburant, afin de le réchauffer et de faciliter le démarrage du véhicule. Ce besoin de chauffage concerne le carburant des moteurs Diesel à injection directe, comme celui des moteurs à allumage par compression.  During cold starts of the combustion engines, it may be necessary to provide calories to the fuel, to warm it up and to facilitate the starting of the vehicle. This heating requirement relates to the fuel of direct injection diesel engines, such as compression ignition engines.
L'apport de calories au démarrage du moteur doit être suffisant pour limiter le paraffinage du carburant et éviter le colmatage du filtre à gazole, qui génère des chutes de pression dans la rampe d'alimentation, pouvant entraîner des instabilités, des calages, voire des refus de démarrage .  The intake of calories at the start of the engine must be sufficient to limit the waxing of the fuel and avoid clogging of the diesel filter, which generates pressure drops in the feed ramp, which can cause instabilities, stalls or even refusal to start.
Selon une première solution connue, le réchauffage du gazole peut être basé sur la récupération des calories fournies par le système d'injection. Le principe consiste à faire circuler le carburant en boucle courte vers l'entrée du filtre à gazole.  According to a first known solution, the heating of the diesel can be based on the recovery of the calories provided by the injection system. The principle is to circulate the short-loop fuel to the inlet of the diesel filter.
Une autre solution connue est basée sur la fourniture de calories via un réchauffeur électrique implanté sur le circuit à carburant. Le principe consiste à générer une énergie thermique en alimentant un matériau conducteur en courant électrique. Another known solution is based on the supply of calories via an electric heater installed on the fuel circuit. The principle consists of generating thermal energy by supplying a conductive material with electric current.
II a déjà été proposé de disposer un véritable dispositif de chauffage sur le circuit d'alimentation de carburant. La publication FR 2 481 751 décrit notamment un réseau d'alimentation en carburant pour moteur Diesel, comportant un dispositif de chauffage de combustible, alimenté par la batterie du véhicule, entre la pompe et le système d'injection du moteur.  It has already been proposed to have a real heating device on the fuel supply circuit. Publication FR 2 481 751 describes in particular a fuel supply network for a diesel engine, comprising a fuel heating device, powered by the vehicle battery, between the pump and the engine injection system.
Actuellement, la réduction des émissions de C02 impose une optimisation de la consommation électrique des véhicules. La solution de réchauffage gazole doit donc être performante, sans pénaliser la consommation en phase de démarrage du véhicule. La solution décrite dans la publication citée, présente l'inconvénient d'être fortement consommatrice en électricité. Par ailleurs, elle n'est pas adaptée aux architectures de véhicule hybride, qui permettent de nouvelles stratégies de démarrage  At present, the reduction of C02 emissions requires an optimization of the electric consumption of the vehicles. The diesel heating solution must therefore be efficient, without penalizing consumption during the starting phase of the vehicle. The solution described in the publication cited, has the disadvantage of being a heavy consumer of electricity. Moreover, it is not adapted to hybrid vehicle architectures, which allow new start-up strategies
La présente invention vise à tirer profit des importantes quantités de chaleur libérées en fonctionnement par des batteries de traction de véhicule hybride, pour aider au réchauffage du moteur thermique, pendant sa phase de démarrage.  The present invention aims to take advantage of the large amounts of heat released in operation by hybrid vehicle traction batteries, to help heat the engine during its startup phase.
Dans ce but, elle propose que le carburant soit réchauffé par échange thermique avec le circuit de refroidissement de la batterie du véhicule, lorsque la température extérieure est comprise entre deux seuils de température.  For this purpose, it proposes that the fuel is heated by heat exchange with the vehicle battery cooling circuit, when the outside temperature is between two temperature thresholds.
De préférence, le réchauffage du carburant est interrompu dès que la température extérieure température extérieure, ou la température du carburant dépasse le deuxième supérieur.  Preferably, the heating of the fuel is interrupted as soon as the outside temperature outside temperature, or the fuel temperature exceeds the upper second.
Conformément à l'invention, le carburant est réchauffé au passage par un échangeur thermique traversé par le circuit d'eau de refroidissement d'une batterie du véhicule . According to the invention, the fuel is heated in passing by a heat exchanger traversed by the cooling water circuit of a battery of the vehicle.
D'autres caractéristiques et avantages de l'invention ressortiront clairement de la lecture de la description suivante d'un mode de réalisation non limitatif de celle-ci, en se reportant au dessin annexé, dont la figure unique présente l'architecture générale du système proposé .  Other characteristics and advantages of the invention will emerge clearly from a reading of the following description of a nonlimiting embodiment thereof, with reference to the appended drawing, the single figure of which presents the general architecture of the system. offers .
L'architecture hybride du schéma inclut un moteur thermique 1 et son circuit d'alimentation de carburant 2. Une machine électrique de traction 3 est couplée, ou non, (par des moyens de couplage non représentés) au moteur thermique 1 et à la transmission 4 du véhicule. Une batterie électrique de traction 6 permet de fournir en électricité la machine électrique 3. Elle est reliée à un échangeur de chaleur 7 par un circuit de refroidissement 8. L'ensemble des composants de l'architecture est piloté par un superviseur 9. Le circuit de carburant principal, entre le réservoir de carburant 11 et le moteur thermique 2, traverse l' échangeur de chaleur 7. Il présente une branche de dérivation 2a autour de celui-ci.  The hybrid architecture of the diagram includes a heat engine 1 and its fuel supply circuit 2. An electric traction machine 3 is coupled, or not (by coupling means not shown) to the heat engine 1 and to the transmission 4 of the vehicle. An electric traction battery 6 makes it possible to supply the electric machine 3 with electricity. It is connected to a heat exchanger 7 by a cooling circuit 8. All the components of the architecture are controlled by a supervisor 9. The circuit of main fuel, between the fuel tank 11 and the heat engine 2, passes through the heat exchanger 7. It has a bypass branch 2a around it.
Le dispositif comporte plusieurs capteurs (non représentés), dont un capteur de température de carburant, un capteur de température extérieure, et un capteur de température d'eau de refroidissement batterie. Les signaux de tous les capteurs sont reçus par le superviseur 9.  The device comprises a plurality of sensors (not shown), including a fuel temperature sensor, an outdoor temperature sensor, and a battery coolant temperature sensor. The signals of all the sensors are received by the supervisor 9.
L'ensemble est contrôlé de la manière suivante. En fonctionnement normal, le moteur thermique 1, la machine électrique de traction 3, ainsi que leurs alimentations respectives en carburant et en électricité, sont pilotés par le superviseur 9.  The set is controlled as follows. In normal operation, the heat engine 1, the electric traction machine 3, and their respective fuel and electricity supplies, are controlled by the supervisor 9.
En phase de démarrage, tant que la température extérieure mesurée T ext est inférieure à un premier seuil, T_GO_liml (T_ext < T_GO_liml) , il n'est pas possible de démarrer le moteur thermique, car le carburant est figé. Le véhicule ne dispose que de la machine électrique pour se déplacer. Il roule obligatoirement en mode électrique.  In the start-up phase, as long as the measured external temperature T ext is lower than a first threshold, T_GO_liml (T_ext <T_GO_liml), it is not possible to start the engine, because the fuel is frozen. The vehicle only has the electric machine to move. It rolls necessarily in electric mode.
Le superviseur choisit également un second seuil de température de carburant T GO lim2, supérieur à la température extérieure. Lorsque la température extérieure est comprise entre les deux seuils (T GO lirai < T extérieure < T GO lim2), on distingue deux situations. The supervisor also chooses a second threshold of fuel temperature T GO lim2, higher than the outside temperature. When the outside temperature is between the two thresholds (T GO lirai <T outside <T GO lim2), two situations are distinguished.
Tant que la température du carburant T GO reste inférieure au deuxième seuil (T GO < T GO lim2) , la propulsion du véhicule peut se faire soit en mode électrique, soit en mode thermique, en fonction de la décision du superviseur et des autres conditions de fonctionnement. L'eau de refroidissement de la batterie circule dans son circuit de refroidissement. Le pilotage du refroidissement se fait au travers d'un capteur de température d'eau par exemple. Le capteur de température carburant mesure la température du carburant dans le circuit d'alimentation en carburant du moteur thermique. Dans cette zone, le carburant a généralement besoin d'être réchauffé pour démarrer, car la température du carburant est en principe égale à la température extérieure au démarrage du véhicule. Dans ce cas, l'échangeur est fonctionnel, et des calories sont échangées entre le circuit de refroidissement et le circuit d'alimentation en carburant. Le carburant est réchauffé par cet échange thermique, et le démarrage du moteur thermique est facilité .  As long as the fuel temperature T GO remains lower than the second threshold (T GO <T GO lim2), the propulsion of the vehicle can be done either in electric mode or in thermal mode, depending on the decision of the supervisor and other conditions Operating. The cooling water of the battery circulates in its cooling circuit. The control of the cooling is done through a water temperature sensor for example. The fuel temperature sensor measures the temperature of the fuel in the fuel supply circuit of the engine. In this zone, the fuel generally needs to be warmed up to start, because the fuel temperature is in principle equal to the outside temperature at the start of the vehicle. In this case, the exchanger is functional, and calories are exchanged between the cooling circuit and the fuel supply circuit. The fuel is heated by this heat exchange, and the start of the engine is facilitated.
Le réchauffage du carburant est interrompu dès que la température extérieure, ou que la température du carburant dépasse le deuxième seuil :  The heating of the fuel is interrupted as soon as the outside temperature, or the temperature of the fuel exceeds the second threshold:
a) lorsque la température du carburant dépasse le deuxième seuil (T GO > T GO lim2) , le carburant est suffisamment chaud. Il n'est plus nécessaire de le réchauffer. L'échangeur peut être contourné.  a) when the fuel temperature exceeds the second threshold (T GO> T GO lim2), the fuel is hot enough. It is no longer necessary to warm it up. The exchanger can be bypassed.
b) lorsque la température extérieure dépasse le deuxième seuil (T GO lim2 < T extérieure) , le carburant est suffisamment chaud au démarrage, et il n'est pas nécessaire de le réchauffer. L'échangeur peut être contourné.  b) when the outside temperature exceeds the second threshold (T GO lim2 <T outside), the fuel is warm enough at start-up, and there is no need to warm it up. The exchanger can be bypassed.
En résumé, la température du carburant et la température extérieure au véhicule sont comparées à un premier seuil en dessous duquel le démarrage du véhicule est interdit, et à un second seuil supérieur au premier, au-dessus duquel le moteur démarre sans réchauffage du carburant. Entre les deux seuils, le carburant est réchauffé par échange thermique avec le circuit de refroidissement de la batterie du véhicule. In summary, the fuel temperature and the temperature outside the vehicle are compared to a first threshold below which the vehicle starts. is prohibited, and at a second threshold higher than the first, above which the engine starts without reheating the fuel. Between the two thresholds, the fuel is heated by heat exchange with the vehicle battery cooling circuit.
Enfin, l'échangeur entre le circuit de refroidissement batterie et le circuit d'alimentation carburant du moteur thermique peuvent aussi échanger de la chaleur sur la partie chaude du circuit carburant (non représentée sur le schéma) , qui correspond au circuit de retour vers le réservoir de carburant. Le circuit de retour du carburant traverse alors l'échangeur thermique, de sorte que l'échangeur de chaleur est aussi utilisable pour limiter le réchauffage du carburant à son retour vers le réservoir, en sortie des injecteurs ou de la pompe haute pression .  Finally, the exchanger between the battery cooling circuit and the fuel supply circuit of the heat engine can also exchange heat on the hot part of the fuel circuit (not shown in the diagram), which corresponds to the return circuit to the engine. Fuel tank. The fuel return circuit then passes through the heat exchanger, so that the heat exchanger is also usable to limit the reheating of the fuel on its return to the tank, at the outlet of the injectors or the high pressure pump.
Les avantages de cette invention sont nombreux. Parmi ceux-ci, on peut souligner l'intérêt du pilotage du démarrage moteur thermique en fonction de la température extérieure et de l'utilisation du circuit de refroidissement batterie, pour aider à chauffer le carburant au démarrage et augmenter la qualité du démarrage du moteur thermique.  The advantages of this invention are numerous. Among these, we can highlight the importance of controlling the start of the engine according to the outside temperature and the use of the battery cooling circuit, to help heat the fuel at startup and increase the quality of the engine start. thermal.
Dans le cas d'un véhicule hybride, illustré de manière non limitative par le schéma, comportant au moins un moteur thermique 1 et une machine électrique 3 alimentée par une batterie de traction munie d'un circuit d'eau de refroidissement, celui-ci peut se déplacer en utilisant uniquement sa source de propulsion électrique 3, tant que la température du carburant est inférieure au deuxième seuil. Le moteur thermique est alors démarré en roulage, lorsque la température du carburant atteint ce seuil.  In the case of a hybrid vehicle, illustrated in a non-limiting manner by the diagram, comprising at least one heat engine 1 and an electric machine 3 powered by a traction battery provided with a cooling water circuit, the latter can move using only its electric propulsion source 3, as long as the fuel temperature is below the second threshold. The engine is then started running, when the fuel temperature reaches this threshold.

Claims

REVENDICATIONS
1. Procédé de réchauffage du carburant au démarrage d'un moteur thermique (1) de véhicule dans lequel la température du carburant (T GO) et la température extérieure du véhicule (T ext) sont comparées à un premier seuil (T GO lirai) en dessous duquel le démarrage du véhicule est interdit, et à un second seuil (T GO lim2) supérieur au premier au-dessus duquel le moteur démarre sans réchauffage du carburant, caractérisé en ce que le carburant est réchauffé par échange thermique avec le circuit de refroidissement ( 8 ) de la batterie ( 6 ) du véhicule lorsque la température extérieure (T ext) est comprise entre les deux seuils (T GO lirai, T GO lira2). A method of reheating the fuel when starting a vehicle engine (1) in which the fuel temperature (T GO) and the outside temperature of the vehicle (T ext) are compared to a first threshold (T GO lirai) below which the starting of the vehicle is prohibited, and at a second threshold (T GO lim2) greater than the first above which the engine starts without reheating the fuel, characterized in that the fuel is heated by heat exchange with the circuit of cooling (8) of the battery (6) of the vehicle when the outside temperature (T ext) is between the two thresholds (T GO lirai, T GO lira2).
2. Procédé de réchauffage de carburant selon la revendication 1, caractérisé en ce que le réchauffage du carburant est interrompu dès que la température extérieure {T_ext) , ou la température du carburant {T_GO) , dépasse le deuxième seuil (T GO lira2).  2. A method of heating fuel according to claim 1, characterized in that the heating of the fuel is interrupted as soon as the outside temperature {T_ext), or the fuel temperature {T_GO), exceeds the second threshold (T GO lira2).
3. Procédé de réchauffage de carburant selon la revendication 1 ou 2, caractérisé en ce que le circuit de refroidissement ( 8 ) de la batterie est utilisé pour limiter le réchauffage du carburant sur son circuit de retour vers le réservoir (9) en sortie des injecteurs ou de la pompe haute pression du moteur.  Fuel heating method according to claim 1 or 2, characterized in that the cooling circuit (8) of the battery is used to limit the heating of the fuel on its return circuit to the reservoir (9) at the outlet of the fuel tanks. injectors or high pressure pump motor.
4. Procédé de réchauffage de carburant, selon la revendication 1, 2 ou 3, caractérisé en ce que le véhicule se déplace en utilisant uniquement une source de propulsion électrique (3) tant que la température du carburant {T_GO) est inférieure au deuxième seuil (T GO lira2).  A fuel heating method according to claim 1, 2 or 3, characterized in that the vehicle moves using only an electric propulsion source (3) as long as the fuel temperature (T_GO) is below the second threshold. (T GO lira2).
5. Procédé de réchauffage de carburant selon la revendication 4, caractérisé en ce que le moteur thermique (1) est démarré en roulage lorsque la température du carburant (T GO) atteint le deuxième seuil.  5. A method of heating fuel according to claim 4, characterized in that the engine (1) is started running when the fuel temperature (T GO) reaches the second threshold.
6 . Dispositif de réchauffage de carburant entre le réservoir de carburant (9) et le moteur thermique (1) d'un véhicule comportant un capteur de température de carburant, et un capteur de température extérieure, caractérisé en ce que le carburant est réchauffé au passage par un échangeur thermique (7) , traversé par le circuit d'eau de refroidissement (8) d'une batterie (6) du véhicule. 6. Fuel heating device between the fuel tank (9) and the heat engine (1) of a vehicle having a fuel temperature sensor, and an external temperature sensor, characterized in that the fuel is heated in passing by a heat exchanger (7), through which the cooling water circuit (8) of a battery (6) of the vehicle passes.
7. Dispositif de réchauffage de carburant selon la revendication 6, caractérisé en ce que le circuit de carburant (2) comporte une branche de contournement (2a) de 1' échangeur thermique (7) .  Fuel heater according to claim 6, characterized in that the fuel circuit (2) has a bypass branch (2a) of the heat exchanger (7).
8. Dispositif de réchauffage de carburant selon la revendication 6, ou 7, caractérisé en ce que le circuit de retour du carburant traverse également l' échangeur thermique (7) de manière à pouvoir limiter la température du carburant (T GO) à son retour du moteur (1) vers le réservoir ( 9 ) .  Fuel heater according to claim 6 or 7, characterized in that the fuel return circuit also passes through the heat exchanger (7) so as to be able to limit the fuel temperature (T GO) upon return. from the engine (1) to the tank (9).
9. Dispositif de réchauffage de carburant selon la revendication 6, 7 ou 8, caractérisé en ce qu'il comporte un capteur de température d'eau de refroidissement de batterie .  9. Fuel heating device according to claim 6, 7 or 8, characterized in that it comprises a battery coolant temperature sensor.
10. Véhicule hybride comportant au moins un moteur thermique et une machine électrique (3) alimentée par une batterie de traction (6) munie d'un circuit d'eau de refroidissement (8) , caractérisé en ce qu'il présente un dispositif de réchauffage de carburant conforme à l'une des revendications 6 à 9.  10. Hybrid vehicle comprising at least one heat engine and an electric machine (3) powered by a traction battery (6) provided with a cooling water circuit (8), characterized in that it has a cooling device fuel heater according to one of claims 6 to 9.
EP14710019.2A 2013-02-25 2014-02-17 Method and device for heating fuel for an internal combustion engine Withdrawn EP2959142A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1351645A FR3002596B1 (en) 2013-02-25 2013-02-25 METHOD AND DEVICE FOR FUEL HEATING FOR INTERNAL COMBUSTION ENGINE
PCT/FR2014/050318 WO2014128392A1 (en) 2013-02-25 2014-02-17 Method and device for heating fuel for an internal combustion engine

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EP2959142A1 true EP2959142A1 (en) 2015-12-30

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US (1) US9719442B2 (en)
EP (1) EP2959142A1 (en)
JP (1) JP2016513040A (en)
KR (1) KR20150119851A (en)
CN (1) CN104884777A (en)
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WO (1) WO2014128392A1 (en)

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KR20150119851A (en) 2015-10-26
FR3002596A1 (en) 2014-08-29
JP2016513040A (en) 2016-05-12
US9719442B2 (en) 2017-08-01
US20150337776A1 (en) 2015-11-26
WO2014128392A1 (en) 2014-08-28
CN104884777A (en) 2015-09-02

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