EP1971758A1 - Method of protecting the ventilating means of an internal combustion engine - Google Patents
Method of protecting the ventilating means of an internal combustion engineInfo
- Publication number
- EP1971758A1 EP1971758A1 EP07717958A EP07717958A EP1971758A1 EP 1971758 A1 EP1971758 A1 EP 1971758A1 EP 07717958 A EP07717958 A EP 07717958A EP 07717958 A EP07717958 A EP 07717958A EP 1971758 A1 EP1971758 A1 EP 1971758A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ventilation means
- vehicle
- blocking
- test
- fan
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
- F01P11/14—Indicating devices; Other safety devices
- F01P11/20—Indicating devices; Other safety devices concerning atmospheric freezing conditions, e.g. automatically draining or heating during frosty weather
-
- 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
- F01P2025/34—Heat exchanger 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
- F01P2031/00—Fail safe
- F01P2031/24—Fail safe for freezing
Definitions
- the present invention relates to a method for protecting the ventilation means of an internal combustion engine of a vehicle against the blockage of these means due to climatic conditions.
- the internal combustion engines are equipped with ventilation means (designated “motorcycle ventilation group", GMV abbreviated) that sucks in or blows air from outside the vehicle to cool the engine via the heat transport circuit.
- ventilation means designated “motorcycle ventilation group”, GMV abbreviated
- These means mainly comprise one or more fans powered by one or more electric motors or with a belt connected to the motor shaft (crankshaft) and an electromechanical engagement type. Fans are only turned on when the engine temperature reaches or exceeds a predetermined value.
- frost or snow may block the ventilation unit, whether it is of the blower type (the fan is located in front of the radiator in which the coolant circulates) or of the suction type (the fan being located behind the fan). radiator).
- the fan can be blocked by a direct accumulation of snow on the fan when the vehicle is running or by frozen water. Snow can melt when driving under the hood when the engine is running, then freeze. This can happen when the vehicle is moving, but also after the engine has stopped, if the outside temperature is low enough. Blocking the group ventilation can cause significant damage to the engine, but also to the automatic gearbox when the vehicle is equipped. Indeed, the blocking of the ventilation unit prevents efficient cooling of the engine and the gearbox, especially when the vehicle is driving in town where the converter of the automatic transmission generates a lot of calories. Blocking the fan can also cause an electrical failure.
- the present invention provides a solution that reduces the risk of blocking the motorcycle fan unit due to snow and ice formation.
- the invention relates to a method of protection against the blockage of the ventilation means of an internal combustion engine of a vehicle, consisting in operating the ventilation means periodically when the weather conditions indicate a risk. blocking the ventilation means, the operating modes of said means comprising the duration and the frequency of each operating period and being determined according to at least one parameter.
- said operating modes also comprise the speed of rotation of the ventilation means.
- Said operating modes can be adjusted according to at least one of the following parameters: the temperature external to the vehicle, the average speed of the vehicle, the average fuel consumption of the vehicle, the state of the vehicle windscreen wiper on or off and the driving profile of the vehicle corresponding to the city traffic, road traffic or stationary vehicle.
- a test is performed to determine the operating state of the ventilation means.
- This test may consist in starting the ventilation means and, following the start of said means, determining the appearance of at least one characteristic event of the blocking of these means.
- a relatively stable operating speed of the engine is detected and the ventilation means are only switched on if such a steady state is detected.
- the occurrence of at least one of the following events characteristic of the blocking of the ventilation means is then detected: overcurrent of the electric current actuating the ventilation means, reduction of the rotational speed of the internal combustion engine and increase of the consumption in fuel of said engine.
- a blockage when a blockage is detected, one places oneself in the operating conditions at full speed of the ventilation means in order to try to unblock them.
- a new blocking test may be carried out immediately after the attempt to operate at full speed and, if a blockage is detected again, a new attempt to operate at full speed is performed, the blocking test operations and unlocking attempt being performed until unblocking of the ventilation means. If the ventilation means remain blocked after a predetermined number of unsuccessful unlocking attempts, the Lock test and unlock attempt attempts stop and an alarm indicates to the driver of the vehicle that the vehicle is malfunctioning.
- the test to determine the possible blockage of the ventilation means may be systematically performed before the operation of said means for short periods.
- FIG. 1 shows schematically a motorcycle fan assembly with its engine environment and various components
- FIGs 2 to 4 are diagrams illustrating an embodiment of the invention.
- the ventilation means 10 are constituted by a motorcycle fan assembly mainly comprising a fan 12 actuated by an electric motor, whose start and stop are controlled by means of a service housing 14
- Air 16 is sucked outside the vehicle by the fan 12.
- This air passes through a radiator 18 in which circulates a heat transfer fluid.
- the latter is intended to cool an internal combustion engine 20 which is coupled to a manual or automatic gearbox 22.
- a pump 24 circulates the heat transfer liquid in a cooling circuit, the circulation of the cooled fluid being represented by broken lines. and that of the hot fluid being represented by dotted lines.
- the hot heat transfer fluid leaves the engine block by an output housing 26 equipped with a thermostat.
- the latter directs the coolant in closed circuit, to the pump 24, if the temperature of the engine is low. If this temperature is higher at a predetermined temperature, the thermostat directs the heat transfer fluid to the radiator 18 and to the heating system 28 of the passenger compartment.
- the coolant recovers calories from the hot elements (the engine 20 possibly equipped with a turbocharger and the gearbox 22) to evacuate through the radiator 18 and the heating system 28 of the passenger compartment.
- a temperature probe 30 attached to the radiator 18 measures the temperature of the coolant. This probe is connected to a motor control unit 32.
- the control unit 32 sends a control signal to the service box 14 in order to implement run the fan 12 and operate it at a rotation speed which depends on the temperature of the coolant.
- a predetermined threshold set between approximately 83 and 100 ° C.
- the vehicle comprises a service housing 34 for acquiring data relating to at least one of the following parameters: the outside temperature 36, the speed 38 of the vehicle, the operation windscreen wiper 40 (if the windscreen wiper is on or off) and possibly other information 42 such as the vehicle running profile (city or highway traffic, vehicle on the road). stopping) or fuel consumption.
- the speed and the fuel consumption can be averages calculated over appropriate distances which can for example be between 100 meters and several kilometers or over the last period of elapsed time which can be for example of the order of several minutes.
- the fan 12 of the fan motor unit 10 is actuated intermittently and for short periods which can be for example from a few seconds to a few minutes.
- the operating modes of the motorcycle fan unit mainly the duration and the frequency of each operating cycle, are controlled according to one or more predefined parameters among which may be mentioned the temperature outside the vehicle, the operation of the wiper. front window (in the on or off position), the driving profile (vehicle stationary or driving on the road or motorway or in the city), the average speed over the last kilometers traveled or over a period of time (rolling data) and the average consumption also over the last kilometers or over a period of time (also a slippery data).
- Figures 2 to 4 illustrate the diagram of a form of implementation of the invention.
- four modes of operation can be distinguished: a first mode 44 for activating the method, followed by a mode 46 for detecting a possible blockage of the motorcycle fan unit (FIG. 2), followed by a protection mode 48 (Figure 3), itself followed by a protection mode with stopping the engine of the vehicle 50 ( Figure 4).
- a first mode 44 for activating the method
- a mode 46 for detecting a possible blockage of the motorcycle fan unit
- a protection mode 48 Figure 3
- a protection mode with stopping the engine of the vehicle 50 Figure 4
- the protection mode 48 FIG. 3
- the activation mode 44 ( Figure 2), it is determined whether or not the fan motor unit needs to be protected.
- the internal combustion engine of the vehicle is started (52) and a logic 54 determines whether the vehicle has been sold in a geographical area where there is a risk of snow or frost.
- the geographical area of use of the vehicle can be obtained by an onboard system of the GPS ("Global Positioning System") type. If there is no risk, the process is not implemented (56). If a risk exists, we compare the outside temperature Text with a threshold of predetermined temperature Tmin (58) for which and below which a risk of snow or frost exists (for example temperature ⁇ 2 ° C). If the vehicle is equipped with an automatic gearbox, it is decided that the risk exists if the gearbox is set to "snow" mode.
- blocking detection mode 46 is set to determine the operating state of the fan motor unit (blocked or not). This blocking detection mode is advantageously carried out at the start of the vehicle and then periodically.
- the blocking test is then performed (68). For this, a brief rotation of the fan motor unit at medium speed is ordered (68), for example for 3 seconds. This time must be short enough not to produce electrical problems if the fan is blocked. In general, a few seconds are sufficient to perform the test. If a control system of the intensity of the electric current at the terminals of the motorcycle fan unit equips the vehicle, it detects a current overcurrent due to a blocking of the motorcycle fan unit. In the absence of such a system, one can look at the consequence of such overcurrent on the engine idle. When rotating the fan, a peak of electric current occurs which causes the engine speed to drop briefly. This is observed engine idling.
- the overcurrent peak is larger and longer, which modifies the idle speed of the motor more significantly and longer.
- the amount of fuel injected is also increased by the engine control unit to regain the desired idle.
- Each of these parameters can therefore provide an indication of the operating state (blocked or not) of the fan motor unit. It is examined whether the current overcurrent and / or the engine idle decrease and / or the fuel consumption increase is less than a predetermined value (70). If this is the case, there is no blocking of the fan, the numbers N and b are equal to zero and the protection mode (48, figure 3) is entered.
- a predetermined value 70
- the number b of blockages is then compared to a predetermined maximum number bmax of blockages. If b is less than bmax, an unlocking attempt is made (74) under the operating conditions of the fan at full speed for a predetermined period of time (for example a few seconds).
- a new blocking test is then performed (64, 66, 68, 70). This test operation of locking and unlocking attempt is repeated until the unlocking of the fan or until b is equal to bmax.
- an alarm signals to the driver a malfunction of the vehicle or, more precisely, a failure of the cooling circuit or the motorcycle fan unit, and the unlocking attempt is abandoned, since the fan protection mode is not engaged (78).
- the fan goes to the protection mode 48 ( Figure 3) to reduce or even eliminate the risk of blocking the motorcycle fan unit by snow or frost.
- the counter of the number N of periodic trips is incremented to N + 1 (step 80).
- a brief rotation of the fan is periodically ordered. A few seconds of operation are usually sufficient to prevent the fan from blocking. In addition, this operating time should be short enough not to cause electrical problems in case the fan is blocked.
- the capacity of the battery fitted to the vehicle must also be taken into account. A short duration also makes it possible not to generate a noise harmful to the comfort of the passengers.
- the operating modes of the fan for these periodic trips depend on one or more parameters. By operating modes is meant the duration and the frequency of the cycles of the short operations and, advantageously but not necessarily, the speed of rotation of the fan.
- the driving profile (82) that is to say, road or highway driving or city driving
- V (84) during for example the last one hundred meters or the last kilometer traveled (s) or the last period of elapsed time, for example the minute preceding the start of the fan (if V is less than for example three predetermined thresholds Vl, V2 and V3).
- Tnc uncorrected time between two trips (86) which may take the value T1, T2 or T3.
- the time Tnc is then adjusted taking into account two parameters: the position of the front windscreen wiper switch (88) and the outside temperature (90). For these two parameters, a multiplicative factor M1 and M2 are respectively determined.
- the operations of the protection mode (48) are then restarted by repositioning on the diagram in step 80 (at the top of FIG. 3). If the number N of periodic trips is equal to Nrotmax, then a blocking test is again carried out by returning to step 64 of FIG.
- Figure 4 illustrates in diagrammatic form a method of tripping the fan while the vehicle engine has been stopped (102). After stopping the engine, the accumulated snow melts near the hot parts, the water runs and can freeze. The accumulation of ice can then block the motorcycle fan unit. To avoid this problem, the motorcycle fan unit is advantageously started repeatedly over a period determined after stopping the engine of the vehicle.
- a counter indicating the number Npost of periodic trips made after the engine has been stopped is reset (104).
- the counter is then incremented to Npost + 1 (step 106) and it is examined whether the number Npost is less than a predetermined maximum number Npost-max (108). If so, wait for a predetermined period of time Tpost (110) then the fan is turned on (112) for a few seconds or minutes at an average rotational speed. Then return to the start step 106 to continue the cycle of periodic triggers, and so on, until the number Npost is equal to Npost-max.
- Tpost a predetermined period of time
- Tpost the fan is turned on (112) for a few seconds or minutes at an average rotational speed.
- the start step 106 to continue the cycle of periodic triggers, and so on, until the number Npost is equal to Npost-max.
- We then stop the triggering process of the fan (114), having judged that after a Npost-max number of trips of the fan after stopping the motor the risk of blocking the fan is neg
- a blockage of the fan (116) by monitoring the occurrence of an abnormally high electrical overcurrent when the fan is cycled (step 112). ) after stopping the engine. If such an overcurrent does not occur, so if the fan is not blocked, it returns to step 106 to continue the cycle of periodic fan trips. On the other hand, if an overcurrent occurs, the fan is powered to run at high speed to try to unblock it (118). If successful, the periodic triggers process resumes at step 106. In the event of failure, the process stops. An alarm can indicate to the driver the malfunction of the vehicle, or more precisely of the cooling circuit, at the next start. Since a lock test will be performed again at the next engine start if the outside temperature warrants it, we can choose not to alert the driver, since this new test may indicate that the fan is no longer blocked (in case warming of the outside temperature for example).
- Embodiments other than that described and shown may be devised by those skilled in the art without departing from the scope of the present invention. These embodiments may differ from that previously described depending in particular on the desired level of "security". For example, it has been reported that the fan is periodically turned on for short periods of a few seconds. These periods can of course be longer, of the order of a minute for example, if the outside temperature is very low.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Atmospheric Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Nitrogen Condensed Heterocyclic Rings (AREA)
- Air-Conditioning For Vehicles (AREA)
- Exhaust Gas After Treatment (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0650094A FR2896013B1 (en) | 2006-01-10 | 2006-01-10 | METHOD FOR PROTECTING THE VENTILATION MEANS OF AN INTERNAL COMBUSTION ENGINE |
PCT/FR2007/050625 WO2007080347A1 (en) | 2006-01-10 | 2007-01-08 | Method of protecting the ventilating means of an internal combustion engine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1971758A1 true EP1971758A1 (en) | 2008-09-24 |
EP1971758B1 EP1971758B1 (en) | 2010-07-28 |
Family
ID=37216062
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07717958A Not-in-force EP1971758B1 (en) | 2006-01-10 | 2007-01-08 | Method of protecting the ventilating means of an internal combustion engine |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1971758B1 (en) |
AT (1) | ATE475796T1 (en) |
DE (1) | DE602007008053D1 (en) |
FR (1) | FR2896013B1 (en) |
WO (1) | WO2007080347A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2942748A1 (en) * | 2009-03-09 | 2010-09-10 | Peugeot Citroen Automobiles Sa | Cool air flow regulating device for engine of motor vehicle, has adjustment units adjusting closing mechanism with respect to control parameter and including detection units for detecting magnitudes representing bad weather |
DE102011077652A1 (en) * | 2011-06-16 | 2012-12-20 | Robert Bosch Gmbh | Method for operating an electric fan motor |
FR3021362B1 (en) * | 2014-05-23 | 2016-05-20 | Snecma | METHOD FOR STARTING FAN OPERATING TEST |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5566745A (en) * | 1993-05-10 | 1996-10-22 | General Electric Company | Shuttered radiator system with control |
JPH0989307A (en) * | 1995-09-21 | 1997-04-04 | Mitsubishi Heavy Ind Ltd | Outdoor device of engine driven type air conditioner |
US5666745A (en) | 1995-11-06 | 1997-09-16 | Harwood; John M. | Molded plastic toe cap for shoes |
DE19830340C1 (en) * | 1998-07-07 | 1999-11-11 | Siemens Ag | Regulation of cooling air filters for motors working under icy conditions |
DE10019419A1 (en) * | 2000-04-19 | 2001-10-25 | Bosch Gmbh Robert | Cooling system for motor vehicle detects faulty positioning of cooling flow closure unit from variation with time of temperature difference between model and actual temperature variation |
-
2006
- 2006-01-10 FR FR0650094A patent/FR2896013B1/en not_active Expired - Fee Related
-
2007
- 2007-01-08 WO PCT/FR2007/050625 patent/WO2007080347A1/en active Application Filing
- 2007-01-08 AT AT07717958T patent/ATE475796T1/en not_active IP Right Cessation
- 2007-01-08 EP EP07717958A patent/EP1971758B1/en not_active Not-in-force
- 2007-01-08 DE DE602007008053T patent/DE602007008053D1/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2007080347A1 * |
Also Published As
Publication number | Publication date |
---|---|
FR2896013A1 (en) | 2007-07-13 |
DE602007008053D1 (en) | 2010-09-09 |
WO2007080347A1 (en) | 2007-07-19 |
FR2896013B1 (en) | 2010-07-30 |
ATE475796T1 (en) | 2010-08-15 |
EP1971758B1 (en) | 2010-07-28 |
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