EP2094534B1 - Unité de transmission, procédé pour commander une telle unité et véhicule automobile équipé d'une telle unité - Google Patents

Unité de transmission, procédé pour commander une telle unité et véhicule automobile équipé d'une telle unité Download PDF

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Publication number
EP2094534B1
EP2094534B1 EP06849469.9A EP06849469A EP2094534B1 EP 2094534 B1 EP2094534 B1 EP 2094534B1 EP 06849469 A EP06849469 A EP 06849469A EP 2094534 B1 EP2094534 B1 EP 2094534B1
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EP
European Patent Office
Prior art keywords
engine
unit
power train
hydrocarbon
sensor
Prior art date
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Application number
EP06849469.9A
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German (de)
English (en)
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EP2094534A2 (fr
Inventor
Bruno Gaudin
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 Trucks SAS
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Renault Trucks SAS
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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
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1459—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being a hydrocarbon content or concentration
    • 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
    • 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
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D2041/224—Diagnosis of the fuel system
    • F02D2041/225—Leakage detection

Definitions

  • This invention concerns a power train unit for an automotive vehicle. It also concerns a method for controlling the working conditions of such a power train unit and an automotive vehicle equipped with such a power train unit.
  • Automotive vehicles are usually provided with an internal combustion engine which belongs to a power train unit installed in an engine compartment of the vehicle.
  • fluid under pressure e.g. fuel or oil
  • fluid under pressure e.g. fuel or oil
  • the leaking fluid might come into contact with a hot part of the engine, which might induce the beginning of a fire within the engine compartment. In most cases, this will destroy the power train unit, and potentially the whole vehicle.
  • US-6.215.407 discloses the use of hydrocarbon sensors for detecting the presence of hydrocarbon in the bilge area of a boat, either in view of stopping a bilge pump, in view of operating a blower, or in view of providing an alarm.
  • US-5.070.832 discloses a method for controlling an engine.
  • the engine can be de-rated depending on a number of engine operating parameters controlled by sensors monitoring coolant level and temperature, oil pressure and temperature, and air temperature.
  • the engine de-rating consists in changing the maximum operating speed of the engine and/or setting a maximum torque level for the engine.
  • the invention aims at providing a new power train unit for an automotive vehicle which takes into consideration a leak of fluid, like oil or fuel, early enough to take appropriate measures in order to avoid, as much as possible, any potentially dangerous situation.
  • the invention concerns a power train unit for an automotive vehicle, according to claim 1.
  • the hydrocarbon sensor can detect a leak of oil or fuel and the control unit can immediately take appropriate measures to limit this leak and its consequences, without stopping the power unit, since an automotive vehicle like a truck cannot be suddenly stopped because the driver must be given an opportunity to park his vehicle aside from the ongoing traffic or to reach a garage or a maintenance facility.
  • detection of a leak in an engine compartment of a vehicle should not induce, except in extreme cases, an abrupt stop of the power train unit because this would immediately and assistance to the brake and steering systems of the vehicle.
  • abrupt stop of the power train unit could induce a sudden stop of the vehicle, which might be dangerous, depending on the traffic conditions.
  • a power train unit might incorporate one or several of the following features:
  • the invention also concerns an automotive vehicle, in particular a truck, equipped with a power unit as mentioned here-above. Such a vehicle is safer than the ones of the prior art.
  • the invention also concerns a method which can be implemented with a power train unit as described here above and which comprises the steps enumerated in claim 6.
  • Tractor 2 includes a cabin 21 where a driver and, possibly, one or several passengers are seated when the truck is running. Cabin 21 is provided with a driver seat 22, a steering wheel 23 and a dashboard 24. Nevertheless, the invention could be implemented on other types of vehicles, and especially on other types of trucks such as rigid trucks.
  • tractor Underneath cabin 21, tractor is provided with an engine compartment 25 where a Diesel internal combustion engine 4 is installed.
  • This engine has several cylinders, five of which are shown on figure 1 with reference 41.
  • Cylinders 41 are fed with fuel under pressure from a common rail 42 located in an upper part of engine 4.
  • Individual feed lines 43 connect rail 42 to each cylinder 41. Lines 43 connect rail 42 to fuel injectors located in the cylinder heads of cylinders 41.
  • Engine 4 belongs to a power train of tractor 2 which also includes a power transmission line 4' towards the rear wheels 21 of tractor 2.
  • An hydrocarbon sensor 5 is located within engine compartment 25, in the vicinity of rail 42 and lines 43.
  • This sensor can be of the type marketed by Sensor Electronics Corp. of Minneapolis, MN (USA), under reference SEC Millennium Infrared Hydrocarbon Gas Detector. It can actually be of any other convenient type, e.g. the one mentioned in US-A-6,102,085 .
  • Sensor 5 is connected to a control unit 6, which can be for example integrated to a dashboard area 24.
  • An electric line 7 connects sensor 5 to unit 6 and allows to provide unit 6 with an output signal S 5 of sensor 5.
  • Sensor 5 could also be connected to control unit 6 through a shared communication bus, e.g. a CAN-bus.
  • Sensor 5 may be fed with electrical power, either from unit 6 or from a non represented main electrical circuit of tractor 2.
  • Sensor 5 permanently monitors hydrocarbon gases presence within compartment 25.
  • Sensor 5 is located next to parts 42 and 43 which are parts of a fuel circuit which feeds cylinders 41 and which is formed externally with respect to the main body of engine 4. A leak of fuel under pressure is more likely to take place at the level of items 42 and 43. This is why sensor 5 is located in their vicinity.
  • a first step 100 of a method according to the invention sensor 5 is activated to sense the presence of hydrocarbon gases within compartment 25.
  • sensor 5 provides unit 6 with signal S 5 .
  • unit 6 compares the level of hydrocarbon gases concentration C H within compartment 25 to a predetermined value V H .
  • V H is chosen so that one can consider that, if C H is smaller than V H , then no fuel leak occurs within compartment 25. On the contrary, when C H is larger than V H , one considers that a fuel leak takes place in or around engine 4 within compartment 25.
  • a further step 106 is actuated to modify the working conditions of engine 4, without stopping this engine.
  • a further step 106 is actuated to modify the working conditions of engine 4, without stopping this engine.
  • it is essential to give to the driver an opportunity to move truck 1 outside the traffic and, if possible, to reach a garage or another maintenance facility.
  • some power must be available from engine 4 in order to move truck 1. This is why the power train unit comprising items 4 and 4' is not stopped.
  • step 106 unit 6 activates an emergency light 61 mounted on dashboard 24 in order to warn the driver of the potentially dangerous situation.
  • a speaker 62 speaks out a message within cabin 21 in order to inform the driver of the situation.
  • the driver is invited to limit the rotation speed of engine 4 and the torque delivered by this engine.
  • the driver is invited to drive slowly, in order not to request high power from engine 4. This induces that fuel flow to cylinders 41 will be limited, so that the leak should normally also be limited.
  • the driver can then drive truck 1 for a while, while essential safety features are active, in particular breaking and steering assistance.
  • unit 6 might count the time from the instant where it receives a signal S 5 corresponding to an actual hydrocarbon detection within compartment 25. Then, unit 6 can compute a time period after which it will cut engine 4. In such a case, the message sent to the driver via speaker 62 also states the time left before the engine 4 is cut, which takes place in a further step 108.
  • step 106 in addition to the message sent to the driver by items 61 and 62, unit 6 can activate a communication module 63 which can send to a remote operator a telecommunication signal S 63 with the information that hydrocarbon gases have been detected within compartment 25.
  • a communication module 63 which can send to a remote operator a telecommunication signal S 63 with the information that hydrocarbon gases have been detected within compartment 25. This gives to the remote operator the possibility to contact the driver, for example via his cellular phone, in order to check the situation and organize the necessary maintenance operations.
  • unit 6 in step 106, can send to an electronic control unit 44 which controls operation of engine 4 a signal S 6 which activates unit 44 to limit the maximum rotation speed of engine 4 and/or a maximum torque delivered by this engine.
  • a signal S 6 which activates unit 44 to limit the maximum rotation speed of engine 4 and/or a maximum torque delivered by this engine.
  • unit 6 which automatically adjusts the working conditions of engine 4, via unit 44, irrespective of the attitude of the driver.
  • Another electric line 8 connects unit 6 to unit 44.
  • step 106 unit 6 can also activate some external warning lights 64 of truck 1 in order to inform other drivers of the potentially dangerous situation.
  • step 106 unit 44 can be piloted to decrease fuel pressure within common rail 42 and/or feed lines 43 in order to limit the leak.
  • gearbox in case tractor 2 is provided with an electronic gearbox, if hydrocarbon presence has been detected by sensor 5, the gearbox can be blocked in one gear, e.g. the first or second gear, or in one of a predetermined set of gears, which implies that the truck can only be moved slowly. This prevents the driver from trying to drive on a long distance.
  • step 106 another approach might be implemented, in addition or alternatively to the ones already considered: one or several auxiliary equipments, such as an alternator 45 or a motor for accessories, can be stopped or deactivated in order to avoid the creation of sparks which could ignite hydrocarbon gases within compartment 25.
  • auxiliary equipments such as an alternator 45 or a motor for accessories
  • Diesel particulate filter 46 used to temporarily store soot and non-burnt particulars present in the exhaust gases, such a filter must be regularly cleaned by oxidation of the particulate materials.
  • a sub-assembly 47 is used to inject a small quantity of fuel before a catalyst module 48 in an exhaust line 49 of engine 4.
  • unit 6 can inhibit fuel supply to sub-assembly 47 so that no fuel is injected within the exhaust line 49 of engine 4.
  • another hydrocarbon sensor might be installed in the vicinity of sub-assembly 47.
  • control unit 6 can be used to stop the electrical motor and to stop engine 4 as soon as sensor 5 senses hydrocarbon gases within compartment 25. In such a case, the power train unit remains active, even if engine 4 is stopped, since mechanical power is generated by the electric motor.
  • sensor 5 can also detect a leak of oil, in particular in a part of lubricant circuit running on a side of engine 4. Since oil pressure within engine 4 is mainly dependent on engine speed, a limitation of the engine speed, either by action of the driver or directly via unit 44, should limit oil leaking.
  • a first advantage is that it will allow earlier detection of any leak.
  • a second advantage is that, by comparing the signals delivered by the different sensors, it may be possible to perform a more refined determination of the leak source, so that the best corrective strategy can be chosen and implemented.
  • control unit 6 tests several of the above alternative approaches, and evaluates the impact of each of the corresponding corrective strategies to determine if it has an effect on the level of hydrocarbon concentration measured by the sensor(s). Depending on the determined impact, the control unit may choose to maintain one or several control strategies and to discard others.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Claims (13)

  1. Unité de transmission de puissance (4, 4') pour un véhicule automobile (1), ladite unité comprenant un moteur à combustion interne (4), caractérisée en ce que ladite unité comprend également au moins un capteur d'hydrocarbure (5), positionné dans le même compartiment (25) que ledit moteur pour surveiller la présence de gaz d'hydrocarbure à l'intérieur du compartiment, et une unité de commande (6) recevant un signal de sortie (S5) provenant dudit capteur et conçue pour modifier, sur la base dudit signal de sortie, les conditions de travail dudit moteur sans arrêter ladite unité de transmission de puissance et en ce que ledit capteur (5) est positionné à côté d'une partie d'un circuit de carburant (42, 43) dudit moteur (4).
  2. Unité selon la revendication 1, caractérisée en ce que ledit moteur (4) a au moins une conduite de carburant sous haute pression (43) prévue entre un rail commun (42) et des injecteurs de carburant et en ce que ledit capteur (5) est positionné à côté de ladite conduite de haute pression.
  3. Unité selon l'une quelconque des revendications précédentes, caractérisée en ce qu'elle comprend plusieurs capteurs (5) positionnés à l'intérieur dudit compartiment (25).
  4. Unité selon l'une quelconque des revendications précédentes, caractérisée en ce que l'unité de commande (6) est conçue pour envoyer un message d'avertissement sur la base dudit signal de sortie (S5) provenant dudit capteur.
  5. Véhicule automobile, notamment camion (1), équipé d'une unité de transmission de puissance selon l'une quelconque des revendications 1 à 4.
  6. Procédé pour commander les conditions de travail d'une unité de transmission de puissance (4, 4') d'un véhicule automobile (1), ledit procédé comprenant les étapes consistant à :
    a) contrôler (100) la présence de gaz d'hydrocarbure dans un compartiment de moteur (25) dudit véhicule ;
    b) Délivrer à une unité de commande (6) un signal (S5) représentatif de la détection d'hydrocarbure (5) ; et
    c) si ledit signal correspond à la détection de gaz d'hydrocarbure (CH >= VH), modifier (106) les conditions de travail d'un moteur à combustion interne (4) de ladite unité de transmission de puissance, de telle sorte que la pression de carburant régnant à l'intérieur d'une partie (42, 43) dudit moteur reste en deçà d'une valeur prédéterminée, sans arrêter ladite unité de transmission de puissance (4, 4').
  7. Procédé selon la revendication 6, caractérisé en ce que si ledit signal correspond à une détection d'hydrocarbure (CH ≥ VH), un message d'alarme est envoyé dans l'espace conducteur (21) dudit véhicule ou en direction (S63) d'un dispositif de réception à distance.
  8. Procédé selon la revendication 7, caractérisé en ce que ledit message comprend une invitation à réduire ou limiter le couple et/ou la vitesse du moteur.
  9. Procédé selon l'une quelconque des revendications 7 ou 8, caractérisé en ce que ledit message comprend certaines informations relatives à une période de temps après laquelle ledit moteur (4) sera arrêté.
  10. Procédé selon l'une quelconque des revendications 7 à 9, caractérisé en ce que si ledit signal correspond à une détection d'hydrocarbure (CH ≥ VH), un équipement auxiliaire électrique (45) dudit moteur (4) est éteint.
  11. Procédé selon l'une quelconque des revendications 6 à 10, caractérisé en ce que si ledit signal correspond à une détection d'hydrocarbure (CH ≥ VH), au moins un cylindre (41) dudit moteur n'est pas alimenté en carburant.
  12. Procédé selon l'une quelconque des revendications 6 à 11, caractérisé en ce que si ledit signal correspond à une détection d'hydrocarbure (CH ≥ VH), ladite unité de commande (6) pilote une transmission dudit véhicule afin de la maintenir dans un rapport de transmission donné, de préférence un faible rapport de transmission dans un rapport de transmission donné parmi un ensemble de rapports de transmissions prédéterminé.
  13. Procédé selon l'une quelconque des revendications 6 à 12, caractérisé en ce que si ledit signal correspond à une détection d'hydrocarbure (CH ≥ VH), ladite unité de commande (6) active un moteur électrique appartenant à ladite unité de transmission de puissance (4, 4') et conçu pour entraîner une ligne de transmission (4') dudit véhicule (1) et en ce que ladite unité arrête ledit moteur à combustion interne (4).
EP06849469.9A 2006-12-19 2006-12-19 Unité de transmission, procédé pour commander une telle unité et véhicule automobile équipé d'une telle unité Active EP2094534B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2006/004118 WO2008075131A2 (fr) 2006-12-19 2006-12-19 Unité de transmission, procédé pour commander une telle unité et véhicule automobile équipé d'une telle unité

Publications (2)

Publication Number Publication Date
EP2094534A2 EP2094534A2 (fr) 2009-09-02
EP2094534B1 true EP2094534B1 (fr) 2014-03-05

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EP06849469.9A Active EP2094534B1 (fr) 2006-12-19 2006-12-19 Unité de transmission, procédé pour commander une telle unité et véhicule automobile équipé d'une telle unité

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WO (1) WO2008075131A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140365100A1 (en) * 2013-06-11 2014-12-11 Gary J. Speier Vehicle control based on sensed enviornmental condition

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3227153B2 (ja) * 1990-09-05 2001-11-12 本田技研工業株式会社 内燃エンジンのｈｃセンサの劣化検出装置
JPH04116241A (ja) * 1990-09-05 1992-04-16 Honda Motor Co Ltd 内燃エンジンのｈｃセンサの性能監視装置
US5070832A (en) * 1991-03-29 1991-12-10 Cummins Engine Company, Inc. Engine protection system
DE19509310C2 (de) * 1995-03-15 2001-02-08 Iav Motor Gmbh Verfahren und Einrichtung zur Entlastung des Absorptionsspeichers einer Tankentlüftung bei Verbrennungsmotoren
JPH109039A (ja) * 1996-06-20 1998-01-13 Tokyo Gas Co Ltd エンジンの失火判定方法及び装置
FR2769711B1 (fr) * 1997-10-10 1999-12-03 Renault Procede de surveillance du fonctionnement et du vieillissement d'un pot catalytique pour un moteur fonctionnant en melange pauvre et systeme de mise en oeuvre
US5986546A (en) * 1998-10-07 1999-11-16 Meritor Heavy Vehicle Systems, Llc Oil contamination detection assembly
DE10010041A1 (de) * 2000-03-02 2001-09-06 Volkswagen Ag Verfahren und Anordnung zur Bestimmung eines in eine Verbrennungskraftmaschine einzuspeisenden Luft-Kraftstoff-Gemisches
US6215407B1 (en) * 2000-06-09 2001-04-10 John Douglas Winther Hydrocarbon detection, alert, and vapor removal system with discharge containment capabilities

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Publication number Publication date
WO2008075131A2 (fr) 2008-06-26
WO2008075131A3 (fr) 2008-10-16
EP2094534A2 (fr) 2009-09-02

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