EP1947326B1 - System for starting an internal combustion engine, in particular of a vehicle and a vehicle equipped with said system - Google Patents
System for starting an internal combustion engine, in particular of a vehicle and a vehicle equipped with said system Download PDFInfo
- Publication number
- EP1947326B1 EP1947326B1 EP20080100622 EP08100622A EP1947326B1 EP 1947326 B1 EP1947326 B1 EP 1947326B1 EP 20080100622 EP20080100622 EP 20080100622 EP 08100622 A EP08100622 A EP 08100622A EP 1947326 B1 EP1947326 B1 EP 1947326B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- engine
- circuit
- vehicle
- running
- starting motor
- 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.)
- Active
Links
- 238000002485 combustion reaction Methods 0.000 title claims description 5
- 238000000034 method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000004224 protection Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Images
Classifications
-
- 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
- F02N11/10—Safety devices
- F02N11/101—Safety devices for preventing engine starter actuation or engagement
- F02N11/105—Safety devices for preventing engine starter actuation or engagement when the engine is already running
-
- 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
- F02N11/0848—Circuits or control means specially adapted for starting of engines with means for detecting successful engine start, e.g. to stop starter actuation
-
- 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
- F02N11/0851—Circuits or control means specially adapted for starting of engines characterised by means for controlling the engagement or disengagement between engine and starter, e.g. meshing of pinion and engine gear
Definitions
- the present invention relates to a system for starting an internal combustion engine, in particular of a vehicle.
- a starting motor In vehicles equipped with an internal combustion engine, in particular reciprocating engines, such as ordinary Otto or Diesel engines, a starting motor is used to start the engine.
- a power source usually the vehicle's battery.
- a coil is energized and operates a toothed pinion set in motion by the starting motor so as to mesh with a part capable of driving the crankshaft of the vehicle's engine, usually the ring gear on the flywheel.
- the starting motor becomes operational, cranking the engine to make it start.
- the starting motor must be disconnected from the power source, and its mechanical connection with the engine must also be disengaged. This is done by turning the key from the start position to the running position.
- the minimum engine rotation speed is much faster than that generated by the starting motor. It must not be possible for the engine to drive the starting motor. This would cause the starting motor to overheat and break. It could also start a fire, which would be particularly serious in the presence of residual oil or fuel. If the starting motor breaks, and particularly if parts such as the carbon brushes break, they can also cause a short circuit in the whole electrical system on-board the vehicle.
- US-A-5936316 shows a circuit for the ignition key in which an only integrated position is present for both running and starting conditions, eliminating the need of a return spring.
- An engine control system gives current to a supply relay of the starting motor when the starting key is in the ignition position. The system cuts the supply off to the supply relay when a real engine starting is revealed.
- engine running refers to the condition wherein a minimum engine rotation speed has been exceeded, preferably for a predefined period of time.
- the starting motor is mechanically connected to the engine when powered, and disengaged from the engine when it is not powered.
- the system comprises a control device able to assume a start position wherein it closes said first circuit and other positions in wherein it opens it.
- said device is also able to open or close said second circuit simultaneously with the first.
- the system also comprises a safety relay, that, when powered by a third electric circuit, is able to close said second circuit and open it if it is not powered.
- control device closes said third circuit when it is in the start position.
- said device can also close said third circuit in other positions.
- the invention also relates to a vehicle equipped with the system as described above.
- FIG 1 a system for starting an engine of a vehicle, according to the present invention, is schematically illustrated.
- an electric power source for instance the battery of the vehicle, connected in the usual way at one pole to the ground 3 of the vehicle, and at the other to the various users to be powered, which are connected in turn to the ground to create the electric circuits, which can have parts in common, as is frequently the case and also as described below, in addition to the ground.
- the purpose of the first circuit 2 is to supply power to the starting motor 4, to enable it to crank the engine of the vehicle to start it.
- the starting motor can be of a known type, in particular it is preferably of the type that can be mechanically disengaged from the engine when not powered, so that it cannot be driven by said engine.
- the circuit 2 can comprise a control device 5, which can be the ordinary vehicle ignition key, able to assume a number of positions.
- the position indicated in the drawing is the stop position, with the circuits generally disconnected.
- the connections and terminals illustrated in the drawing are merely included as indications, and all variants are possible.
- the device makes a connection to close the circuit 2 in order to allow power to be supplied to the starting motor.
- the circuit 2 comprises the openable contact 6 of the control relay 7.
- the starting motor 4 can only be activated by closing the contact, which is possible by powering the relay 7.
- the relay can be monostable, so that when the power supply is interrupted it re-opens the contact 6 to prevent starting and, in the case described above, disengages the mechanical connection between the engine and the starting motor.
- the coil 9 of the relay can be able to activate the contact 7 and be part of the second circuit 8.
- the latter comprises an apparatus 10 capable of powering it only if the engine is not running. In that way, with the engine running the first circuit 2 is opened by the relay 7 and the starting motor 4 cannot be activated even by turning the device 5 to the start position.
- said apparatus can be such as to provide, at a point in the circuit, one voltage with the engine running and another when the engine is not running.
- said apparatus is capable of supplying at the point 11 of the circuit, connected to the relay 9, the ground voltage 3 with the engine not running and the voltage available at the other pole of the battery with the engine running.
- To "power" means to supply sufficient electric power to activate the relay. Devices of this type are known in the prior art.
- alternators equipped with a terminal or socket capable of providing the voltage as described above are usually provided.
- Said apparatus are incorporated in the alternator.
- Similar devices can comprise a circuit of the alternator capable of generating voltage, or a simple contact that opens at a certain engine rotation speed. The suitable voltage at the terminal can be achieved when the engine reaches a minimum speed of rotation or when it maintains that speed for a suitable length of time. Apparatus of this kind require no further description. Any suitable apparatus can be used.
- the second circuit 8 can, if desired, be closed by the control device 5 in the start position, as in the case in figure 1 , where it has a part in common with the first circuit 2, which is a simple solution that avoids keeping the relay 9 energized unless necessary.
- it could be permanently connected to one pole of the battery, or connected by the device in the running position instead of in the stop position.
- an additional safety relay 12 able to open or close the second circuit 8. It can be similar to the control relay 9 and powered by a third circuit 13 that is opened by the control device when this is in the stop position.
- the arrangement in figure 1 is advantageous because it enables the third circuit to be connected in parallel to all the circuits closed by the control device in both the running and in the start positions.
- the device 1 can be entirely similar to those known in the prior art, with the need for no additional openable contacts.
- the safety relay is useful in the event of the start position contact sticking or another fault that could cause an undesirable activation of the starting motor 4 as soon as the engine is turned off when the device 5 is moved to the stop position.
- the curve D+ represents the voltage at the point indicated by 11 in a test performed using a system like that in figure 1 and +50 represents the voltage downstream of the contact 6 of the control relay 7.
- the voltages range from a minimum of 0 V (ground potential 3) to a maximum of around 12 V (supplied by the battery).
- the voltage +50 rises when the control device is activated to start the engine, said device then being correctly released after a sufficient time, before the voltage D+ rises to 12 V (which happens after the engine has exceeded 1450 rpm for 0.4 ms).
- the control device is not released: however it can be observed that as the voltage D+ rises to the maximum value, the voltage +50 returns to zero, when the control relay is opened, disconnecting the starting motor and avoiding any damage.
- the start procedure can only be performed a second time if the engine is not running, otherwise the control relay, which is not powered, does not allow any power to be supplied to the starting motor.
- an anti-repeat protection may be included, if desired.
Landscapes
- 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)
- Hybrid Electric Vehicles (AREA)
Description
- The present invention relates to a system for starting an internal combustion engine, in particular of a vehicle.
- In vehicles equipped with an internal combustion engine, in particular reciprocating engines, such as ordinary Otto or Diesel engines, a starting motor is used to start the engine. When the ignition key is turned to the start position the starting motor is connected to a power source (usually the vehicle's battery). What generally happens is that a coil is energized and operates a toothed pinion set in motion by the starting motor so as to mesh with a part capable of driving the crankshaft of the vehicle's engine, usually the ring gear on the flywheel. At the same time the starting motor becomes operational, cranking the engine to make it start. At this stage the starting motor must be disconnected from the power source, and its mechanical connection with the engine must also be disengaged. This is done by turning the key from the start position to the running position. When running, the minimum engine rotation speed is much faster than that generated by the starting motor. It must not be possible for the engine to drive the starting motor. This would cause the starting motor to overheat and break. It could also start a fire, which would be particularly serious in the presence of residual oil or fuel. If the starting motor breaks, and particularly if parts such as the carbon brushes break, they can also cause a short circuit in the whole electrical system on-board the vehicle.
- Devices that prevent start procedures from being repeated are frequently used in vehicles. When a start procedure has been performed, these devices prevent another start procedure from being performed until the ignition key has been turned to the stop position, to turn the engine off, if it was running, so as to reduce the risk of damaging the starting motor by performing an incorrect procedure.
- However, due to the fault of the driver, or if the contacts do not re-open (sticking), it is not infrequent for the starting motor to continue to run for too long once the engine is running, even if a single start procedure is performed. In that case the anti-repeat protections known in the prior art are ineffective, and it is possible for the engine to drive the starting motor, with all the consequences listed above.
US-A-5936316 shows a circuit for the ignition key in which an only integrated position is present for both running and starting conditions, eliminating the need of a return spring. An engine control system gives current to a supply relay of the starting motor when the starting key is in the ignition position. The system cuts the supply off to the supply relay when a real engine starting is revealed. - The problems described above have now been solved according to the present invention with a system for starting an internal combustion engine as claimed in
claim 1, comprising: - a starting motor able to start said engine:
- a first electric circuit able to supply power to said starting motor:
- a control relay that, when powered by a second electric circuit, is able to close said first circuit or, when not powered, to open said first circuit;
- a second electric circuit able to supply power to said control relay;
- an apparatus connected to the generator of the vehicle and able to provide the vehicle ground voltage when the engine is not running, and the voltage at the other pole of the battery of the vehicle with the engine running, to provide power to the second electric circuit only if the engine is not running, such that the second electric circuit is able to supply power to said control relay only when the engine is not running.
- The term "engine running" refers to the condition wherein a minimum engine rotation speed has been exceeded, preferably for a predefined period of time. According to a preferred embodiment of the invention, the starting motor is mechanically connected to the engine when powered, and disengaged from the engine when it is not powered.
- According to another preferred embodiment of the invention, the system comprises a control device able to assume a start position wherein it closes said first circuit and other positions in wherein it opens it. Preferably said device is also able to open or close said second circuit simultaneously with the first.
- According to another embodiment, the system also comprises a safety relay, that, when powered by a third electric circuit, is able to close said second circuit and open it if it is not powered.
- According to a further embodiment of the invention said control device closes said third circuit when it is in the start position. Optionally, said device can also close said third circuit in other positions.
- The invention also relates to a vehicle equipped with the system as described above.
- The present invention will now be illustrated through the following detailed description of preferred but not exclusive embodiments, provided merely by way of example, with the help of the drawings attached hereto of which:
-
figure 1 is the diagram of a system for starting the engine of a vehicle according to the present invention; -
figures 2 and 3 represent, respectively, the voltage at an output terminal from a control device and at a point of the second circuit during the phases of a normal start procedure and at a point with an excessively prolonged action on the control device. - With reference to
figure 1 , a system for starting an engine of a vehicle, according to the present invention, is schematically illustrated. There is anelectric power source 1, for instance the battery of the vehicle, connected in the usual way at one pole to theground 3 of the vehicle, and at the other to the various users to be powered, which are connected in turn to the ground to create the electric circuits, which can have parts in common, as is frequently the case and also as described below, in addition to the ground. The purpose of thefirst circuit 2 is to supply power to the startingmotor 4, to enable it to crank the engine of the vehicle to start it. The starting motor can be of a known type, in particular it is preferably of the type that can be mechanically disengaged from the engine when not powered, so that it cannot be driven by said engine. This can be achieved in the way described above with reference to the prior art or in any other known way, not described in detail here. Thecircuit 2 can comprise acontrol device 5, which can be the ordinary vehicle ignition key, able to assume a number of positions. The position indicated in the drawing is the stop position, with the circuits generally disconnected. There may be a running position and a start position; the latter, as is normally the case, is not stable like the others and is maintained by means of a continuous action, for example by the driver on the key, and when released from said position it returns to the normal running position. The connections and terminals illustrated in the drawing are merely included as indications, and all variants are possible. In the start position the device makes a connection to close thecircuit 2 in order to allow power to be supplied to the starting motor. Thecircuit 2 comprises theopenable contact 6 of thecontrol relay 7. The startingmotor 4 can only be activated by closing the contact, which is possible by powering therelay 7. The relay can be monostable, so that when the power supply is interrupted it re-opens thecontact 6 to prevent starting and, in the case described above, disengages the mechanical connection between the engine and the starting motor. For example thecoil 9 of the relay can be able to activate thecontact 7 and be part of the second circuit 8. The latter comprises an apparatus 10 capable of powering it only if the engine is not running. In that way, with the engine running thefirst circuit 2 is opened by therelay 7 and the startingmotor 4 cannot be activated even by turning thedevice 5 to the start position. For example, said apparatus can be such as to provide, at a point in the circuit, one voltage with the engine running and another when the engine is not running. In the case in the example said apparatus is capable of supplying at the point 11 of the circuit, connected to therelay 9, theground voltage 3 with the engine not running and the voltage available at the other pole of the battery with the engine running. Thus with the engine running the potential difference is not sufficient to power therelay 9 even if connected via the control device to the pole of the battery. To "power" means to supply sufficient electric power to activate the relay. Devices of this type are known in the prior art. For example they may be connected to the generator, more commonly an alternator, of the vehicle and are used, for example, to allow an indicator lamp or LED to light up if the generator is unable to supply energy (for example if the engine is not running) and to switch off when the alternator is working. Alternators equipped with a terminal or socket capable of providing the voltage as described above are usually provided. Said apparatus are incorporated in the alternator. Similar devices can comprise a circuit of the alternator capable of generating voltage, or a simple contact that opens at a certain engine rotation speed. The suitable voltage at the terminal can be achieved when the engine reaches a minimum speed of rotation or when it maintains that speed for a suitable length of time. Apparatus of this kind require no further description. Any suitable apparatus can be used. - The second circuit 8 can, if desired, be closed by the
control device 5 in the start position, as in the case infigure 1 , where it has a part in common with thefirst circuit 2, which is a simple solution that avoids keeping therelay 9 energized unless necessary. Alternatively, it could be permanently connected to one pole of the battery, or connected by the device in the running position instead of in the stop position. - According to a preferred embodiment of the invention, there may be an
additional safety relay 12, able to open or close the second circuit 8. It can be similar to thecontrol relay 9 and powered by athird circuit 13 that is opened by the control device when this is in the stop position. The arrangement infigure 1 is advantageous because it enables the third circuit to be connected in parallel to all the circuits closed by the control device in both the running and in the start positions. Thus thedevice 1 can be entirely similar to those known in the prior art, with the need for no additional openable contacts. The safety relay is useful in the event of the start position contact sticking or another fault that could cause an undesirable activation of the startingmotor 4 as soon as the engine is turned off when thedevice 5 is moved to the stop position. In the drawing the curve D+ represents the voltage at the point indicated by 11 in a test performed using a system like that infigure 1 and +50 represents the voltage downstream of thecontact 6 of thecontrol relay 7. The voltages range from a minimum of 0 V (ground potential 3) to a maximum of around 12 V (supplied by the battery). The voltage +50 rises when the control device is activated to start the engine, said device then being correctly released after a sufficient time, before the voltage D+ rises to 12 V (which happens after the engine has exceeded 1450 rpm for 0.4 ms). In the case infigure 3 the control device is not released: however it can be observed that as the voltage D+ rises to the maximum value, the voltage +50 returns to zero, when the control relay is opened, disconnecting the starting motor and avoiding any damage. - The diagram in
figure 1 is provided purely by way of example and the expert in the field will be able to implement all the appropriate variations in accordance with specific requirements. - With the system according to the present invention there is no need for a device to prevent any repetition of the start procedure. The start procedure can only be performed a second time if the engine is not running, otherwise the control relay, which is not powered, does not allow any power to be supplied to the starting motor. However, an anti-repeat protection may be included, if desired.
- With the vehicles known in the prior art it is generally possible (when compatible with the type of power transmission and gear system, manual or automatic), with the engine not running, even in case it cannot be started due to a failure, lack of fuel or for other reasons, to drive the entire vehicle at least for short distances using the starting motor, keeping the clutch and gear engaged and making use of the control device. This is also possible with the system according to the present invention. Although this operation should normally be avoided, it may, at times, represent the only option if the vehicle has to be moved to avoid a hazardous situation.
Claims (7)
- System for starting an internal combustion engine comprising:a starting motor (4) able to start said engine;a first electric circuit (2) able to supply power to said starting motor;a control relay (7) that, when powered by a second electric circuit, is able to close said first circuit or, when not powered, to open said first circuit;a second electric circuit (8) able to supply power to said control relay (7);an apparatus (10) connected to the generator of the vehicle and able to provide the vehicle ground voltage when the engine is not running, and the voltage at the other pole of the battery (1) of the vehicle with the engine running, to provide power to the second electric circuit (8) only if the engine is not running, such that the second electric circuit (8) is able to supply power to said control relay (7) only when the engine is not running.
- System according to claim 1, wherein said starting motor is such as to enable a mechanical connection with the engine, when powered, and to disengage said connection when not powered.
- System according to any of the previous claims, comprising a control device (5) able to assume a start position wherein it closes said first circuit and other positions wherein it opens it.
- System according to claim 3, wherein said device is also able to open or close said second circuit simultaneously with the first.
- System according to any of the previous claims, also comprising a safety relay (12) that, if powered by a third electric circuit (13), is able to close said second circuit and open it if it is not powered.
- System according to claims 3 and 5 wherein said third circuit is opened or closed by said control device.
- Vehicle equipped with the system according to any of the preceding claims.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI20070080 ITMI20070080A1 (en) | 2007-01-19 | 2007-01-19 | STARTING SYSTEM OF AN INTERNAL COMBUSTION ENGINE, IN PARTICULAR OF VEHICLE AND VEHICLE EQUIPPED WITH THAT SYSTEM |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1947326A1 EP1947326A1 (en) | 2008-07-23 |
EP1947326B1 true EP1947326B1 (en) | 2013-02-27 |
Family
ID=38109530
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20080100622 Active EP1947326B1 (en) | 2007-01-19 | 2008-01-18 | System for starting an internal combustion engine, in particular of a vehicle and a vehicle equipped with said system |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1947326B1 (en) |
ES (1) | ES2407971T3 (en) |
IT (1) | ITMI20070080A1 (en) |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5936316A (en) * | 1997-05-22 | 1999-08-10 | Daimlerchrysler Corporation | Vehicle ignition switch having combined run and start position |
US6481404B1 (en) * | 2001-06-12 | 2002-11-19 | Ford Global Technologies, Inc. | Vehicle starting method and system |
JP2003083213A (en) * | 2001-09-17 | 2003-03-19 | Denso Corp | Engine starting system |
-
2007
- 2007-01-19 IT ITMI20070080 patent/ITMI20070080A1/en unknown
-
2008
- 2008-01-18 ES ES08100622T patent/ES2407971T3/en active Active
- 2008-01-18 EP EP20080100622 patent/EP1947326B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
EP1947326A1 (en) | 2008-07-23 |
ITMI20070080A1 (en) | 2008-07-20 |
ES2407971T3 (en) | 2013-06-17 |
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