EP0646712B1 - Apparatus for varying the engine torque in particular operating states of an internal combustion engine - Google Patents
Apparatus for varying the engine torque in particular operating states of an internal combustion engine Download PDFInfo
- Publication number
- EP0646712B1 EP0646712B1 EP94115403A EP94115403A EP0646712B1 EP 0646712 B1 EP0646712 B1 EP 0646712B1 EP 94115403 A EP94115403 A EP 94115403A EP 94115403 A EP94115403 A EP 94115403A EP 0646712 B1 EP0646712 B1 EP 0646712B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- engine
- block
- value
- condition
- mixture
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000002485 combustion reaction Methods 0.000 title description 3
- 239000000446 fuel Substances 0.000 claims description 37
- 239000000203 mixture Substances 0.000 claims description 33
- 238000002347 injection Methods 0.000 claims description 26
- 239000007924 injection Substances 0.000 claims description 26
- 230000006698 induction Effects 0.000 claims description 24
- 230000008859 change Effects 0.000 claims description 20
- 238000007726 management method Methods 0.000 claims description 5
- 230000006870 function Effects 0.000 claims description 3
- 239000002826 coolant Substances 0.000 claims description 2
- 239000012530 fluid Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 claims 2
- 210000004027 cell Anatomy 0.000 description 6
- 208000034423 Delivery Diseases 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000036461 convulsion Effects 0.000 description 3
- 210000004460 N cell Anatomy 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 2
- 230000006399 behavior Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
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
- F02D41/12—Introducing corrections for particular operating conditions for deceleration
- F02D41/123—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off
- F02D41/126—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off transitional corrections at the end of the cut-off period
-
- 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
- F02D41/12—Introducing corrections for particular operating conditions for deceleration
- F02D41/123—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off
Definitions
- the present invention relates to an apparatus controlling the engine torque of a vehicle.
- the apparatus forming the subject of the present invention relates to a control strategy for controlling the introduction of fuel into the cylinders of the engine, causing it to change from a normal fuel-delivery condition to a fuel cut-off condition and vice versa.
- GB-A-2 138 176 proposes-during fuel recovery-after a cut-off condition, the use of several fuel increment tables, the tables being selected according the magnitude of change of the engine speed.
- the object of the present invention is that of providing a system for varying the drive torque in particular operating conditions of a heat engine of a motor vehicle, which will be free from the above mentioned disadvantages and which, therefore, reduces the engine vibrations upon change from a normal fuel-delivery condition to a fuel cut-off condition and vice versa. This object is achieved with the features according to claim 1.
- a system for varying the drive torque of a heat engine (not illustrated) of a vehicle (not illustrated) in particular conditions is generally indicated with the reference number 1.
- the system 1 controls the induction of the air-fuel mixture to the cylinders (not illustrated) of the engine to change from a normal delivery condition of the fuel-air mixture to a mixture cut-off condition and vice versa.
- the system 1 comprises:
- each engine phase that is to say each 180° of the engine crankshaft, the system passes from block 21 to a block 23 in which the detected value F of the angular position of the induction manifold butterfly valve is compared with a threshold value MF1 memorised in block 12. If the value F is less than or equal to the value MF1, the system passes from block 23 to a block 24, whilst if not it returns from block 23 to block 21.
- the detected value RPM of the speed of rotation of the engine is compared with a threshold value MRPM1 memorised in block 12. If the value RPM is greater than or equal to the value MRPM1, the system passes from block 24 to a block 25, whilst otherwise it returns from block 24 to block 21.
- the unit 14 performs a control strategy on devices 4,5,6,7 and 8 for the purpose of changing to the cut-off condition in a predetermined number of engine phases N (which condition does not permit any flow of mixture to the engine) and for the purpose of indicating to the user the change to this cut-off condition by means of the device 8.
- N which condition does not permit any flow of mixture to the engine
- the system passes from block 25 to a block 26 in which, in unit 15 the value F is compared with the threshold value MF1. If the value F is less than or equal to the value MF1 the system passes from block 26 to a block 27, whilst otherwise it returns from block 26 to block 21.
- the value RPM is compared with the threshold value MRPM1. If the value RPM is greater than or equal to the value of MRPM1 the system passes from block 27 to block 22, whilst otherwise it returns from block 27 to block 21.
- FIG 4 is illustrated a preferred embodiment of the strategy performed by the block 25.
- a table 28 ( Figure 5) of coefficients Ki memorised in block 12 is utilised.
- the table 28 comprises N cells to each of which is associated a value of the coefficient Ki.
- the system passes to a block 34 in which the injection time Tj just calculated is multiplied by the coefficient Ki1 in such a way as to define a new injection time Tji1.
- the cylinder in the induction phase is controlled to have a fuel mixture injection according to the new injection time Tji1.
- the system passes to a block 35 in which it is determined if the quantity C is greater than the number N of cells in the table 28. If this is so it passes from block 35 to a block 37 and from this to block 26 of Figure 2, whilst otherwise it passes from block 35 to a block 36 in which the quantity C of the counter 16 is incremented by one unit.
- the system then returns to the block 32.
- the device 8 is activated to indicate, for example by means of a warning lamp (not illustrated) the change to mixture cut-off conditions.
- the block 25 allows the injection time Tji1 to be calculated cylinder by cylinder following a variation of the engine operating conditions.
- the values of the coefficients Ki are processed in such a way as to vary the engine torque during the change from normal mixture-delivery conditions to cut-off conditions according to a law which does not involve sharp changes and therefore engine shocks.
- Other parameters can contribute to the processing of the law of variation of the engine torque in different embodiments, such as the variation of the electronic ignition advance (by suitably managing the device 5), the variation in control of the fuel pump (by suitably managing the device 6) and/or the variation of the rate of flow of inducted air (by suitably managing the device 7).
- the variation of the electronic ignition advance by suitably managing the device 5
- the variation in control of the fuel pump by suitably managing the device 6
- the variation of the rate of flow of inducted air by suitably managing the device 7
- each engine phase that is each 180° of the engine crankshaft, the system passes from block 22 to a block 41 in which, in unit 15 the value Qa detected by a sensor 3, and relating to the rate of flow of air along the induction manifold, is compared with a threshold value MQa memorised in unit 12. If Qa is greater than MQa the system passes from block 41 to a block 42, whilst otherwise it passes from block 41 to a block 43.
- the system passes from block 43 to a block 44 whilst otherwise it passes from block 43 to block 45.
- the detected value RPM of the speed of rotation of the engine is compared with a threshold value MRPM2 memorised in unit 12. If the value RPM is greater than or equal to the value MRPM2 the system returns from block 44 to block 22 whilst otherwise it passes to a block 46.
- the system compares the angular variation of the induction manifold butterfly valve, in a predetermined time ⁇ F/ ⁇ t with the threshold value MFt memorised in unit 12.
- the system passes from block 45 to a block 47, whilst otherwise it passes from block 45 to block 48.
- the system compares the variation of the speed of rotation of the engine in a predetermined time ⁇ RPM/ ⁇ t with a threshold value MRPMt memorised in unit 12. If the value ⁇ RPM/ ⁇ t is greater than or equal to the value MRPMt, the system passes from block 46 to a block 51, whilst otherwise it passes from block 46 to block 52.
- a different quantity representative of the behaviour of the inducted air can be utilised, for example the parameter relating to the inducted air pressure can be utilised.
- the parameter utilised in unit 41 detects possible rapid and unwanted decreases in the speed of rotation of the engine.
- the angular position of the air induction manifold butterfly valve and therefore the angular position of the accelerator pedal is evaluated, which position represents the user's wish to leave the cut-off condition.
- the rate of change of the angular position of the butterfly valve is evaluated and essentially gives the pressure exerted by the user on the accelerator pedal.
- the system 1 envisages exit from the cut-off condition upon a variation in the rate of flow of inducted air (block 41), a variation in the angular position of the butterfly valve (block 43), and a variation in the engine speed (block 44). Moreover, the system 1 detects the way in which the angular position of the butterfly valve varies (block 45) and the way in which the speed of rotation of the engine (block 46) varies. Essentially the system 1 envisages five possibilities (blocks 42,47,48,51 and 52) to determine the exit from the cut-off condition.
- block 12 five tables similar to the table 28 are memorised, each of which relates to a condition for exit from the cut-off condition.
- the associated table is therefore taken from block 12.
- block 53 similar to block 25 of Figures 2 and 4, and from block 53 it moves on to block 21 which represents the normal fuel mixture delivery conditions.
- the operating diagram of block 25 illustrated in Figure 4 can be assumed as an operative scheme also for block 53.
- a command strategy is performed in block 53, by means of the block 14, for control of devices 4,5,6,7 and 8 for the purpose of changing, in a predetermined number of engine phases N, from the mixture cut-off condition to normal mixture-delivery conditions, and for the purpose of indicating to the user, by means of the device 8, this change to normal mixture-delivery conditions.
- FIG 4 alongside the reference numerals for the components of the block 25, and in parenthesis, are indicated the components of the block 53.
- a table (corresponding to blocks 52,47,48,51 or 52 via which the block 53 is reached) of coefficients Ko memorised in block 12.
- the table comprises N cells to each of which is associated a value of the coefficient Ko.
- the block 53 includes a block 54 in which a quantity D is caused to assume the value 1 in counter 16; quantity D being associated with the sequence of cells of the said table. From block 54 the system passes to a block 55 in which the engine operating condition is evaluated and the injection time Tj is calculated for that operating condition.
- the block 53 calculates an injection time Tjo1 following the variations in the operating conditions of the engine.
- the values of the coefficients Ko are processed in such a way as to vary the engine torque, during the change from mixture cut-off conditions to normal delivery conditions, in dependence on a law of variation which does not involve sharp changes and therefore jolts or jerks of the engine.
- the processing of the law of variation of the engine torque can also be in different forms, and can involve other parameters such as the variation of the electronic ignition advance, the variation of the fuel pump control, and/or variation of the rate of flow of inducted air.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Description
- a unit 9 for detecting the magnitudes of the input signals from the sensors 3;
- a memory block 11 in which is stored, for each
operating range of the engine, the management mappings
for the
devices - a
memory block 12 in which are stored threshold values and the values of the coefficients which will be described hereinafter; - a
control block 13 for thedevices - a
block 14 for control of thedevices - a data processing and
comparison block 15 for management of theblocks - a
counter 16 connected to theblock 15. In use, in dependence on the value of the quantities detected by the sensors 3 theblock 15 calculates the engines operating region, takes from the calculated range block 11 the management maps for thedevices block 13 according to the data of these maps, which then controls thedevices
Claims (10)
- Apparatus controlling the engine torque of a vehicle, comprising:a plurality of sensors (3) operable to detect the parameters of the engine such as the speed of rotation, the engine phase, the angular position of the air induction manifold butterfly valve, the temperature of the engine coolant fluid, the temperature of the inducted air, the battery voltage and others;an electronic fuel injection device (4);a memory block (11) in which are memorised, for each operating condition of the engine, management maps for the said fuel injection device (4);a block (13) for controlling said injection device (4) in normal fuel/air mixture-delivery conditions;a block (15) for processing and comparing data, operable to process the parameters of the engine and to manage the said control block (13);first comparison means (23) for comparing, for each engine phase, the detected value (F) of the angular position of the air induction manifold butterfly valve with a first threshold value (MF1);second comparison means (24) for comparing, for each engine phase, the detected value (RPM) of the speed of rotation of the engine with a second threshold value (MRPM1);first control means (25), activated when the said value (F) of the angular position of the butterfly valve is less than the said first threshold value (MF1) and the said value (RPM) of the speed of rotation of the engine is greater than the said second threshold value (MRPM1), to control, for each cylinder of the engine and according to a predetermined first table (28), the flow of mixture to pass, in a predetermined time period, from the normal fuel mixture delivery condition to a mixture cut-off condition with a predetermined law of variation of engine torque;the apparatus being characterised in that it comprises means for detecting the rate of variation (δF/δt and δRPM/δt) of the detected value (F) of the angular position of the induction manifold butterfly valve and the detected value (RPM) of the engine speed, and it also includes five second tables, the first relating to a variation greater than a determined third threshold value (MFt) of the said value (F) of the angular position of the butterfly valve, the second relating to a variation lower than the said third threshold value (MFt) of the said value (F) of the angular position of the said butterfly valve, the third relating to a variation greater than a determined fourth threshold value (MRPMt) of the said value (RPM) of the engine speed, the fourth relating to a variation greater than the said fourth threshold value (MRPMt) of the said value (RPM) of the engine speed, and the fifth relating to a variation beyond a fifth threshold value (MQa) of a value (Qa) corresponding to a parameter of the air inducted along the said induction manifold.
- Apparatus according to claim 1, characterised in that the said first table (28) comprises, in a determined sequence, a plurality of first coefficients (Ki) each of predetermined value, the said first coefficients (Ki) being associated with the number of engine phases set for passage from the normal mixture-delivery condition to the mixture cut-off condition; said first control means (25) including a block (32) which determines, for each engine phase, and according to the engine parameters, the engine operating conditions and from this the injection time (Tj) relating to the cylinder in its induction stroke during that engine phase, and a block (34) which calculates for each engine phase a new injection time (Tji1) as a function of the injection time (Tj) calculated on the basis of the engine operating conditions and one of the said first coefficients (Ki), and which further controls, for each cylinder in its induction stroke, an injection of mixture according to the new injection time (Tji).
- Apparatus according to claims 1 and/or 2, characterised in that it includes third comparison means (43), activated in fuel cut-off conditions, for comparing, for each engine phase, the detected values (F) of the angular position of the air induction manifold butterfly valve with a sixth threshold value (MF2); fourth comparison means (44), activated in fuel cut-off conditions, for comparing, for each engine phase, the detected value (RPM) of the speed of rotation of the engine with a seventh threshold value (MRPM2); second control means (53), activated when the said value (F) of the angular position of the butterfly valve is greater than the said sixth threshold value (MF2) or when the said value (RPM) of the engine speed is less than the said seventh threshold value (MRPM2), to control, for each engine cylinder and according to one of said five second tables, the flow rate of mixture so as to change, in a predetermined time period, from the mixture cut-off condition to the normal fuel-delivery condition with a predetermined law of variation of engine torque.
- Apparatus according to claim 3, characterised in that it includes fifth comparison means (41), activated in fuel cut-off conditions, for comparing, for each engine phase, the detected value (Qa) relating to the parameter of the air inducted along the said induction manifold, with the said fifth threshold value (MQa) to select said fifth second table as the proper second table; said second control means (53) being activated when the said value (Qa) relating to the parameter of the air inducted along the said induction manifold is greater than the said fifth threshold value (MQa).
- Apparatus according to claim 3 and/or 4, characterised in that each of said five second tables comprises a plurality of second coefficients (Ko) in a determined sequence, each said second coefficient being of predetermined value, the said second coefficients (Ko) being associated with the number of engine strokes set for passing from the mixture cut-off condition to the normal fuel-delivery condition; the said second control means (53) including a block (55) which, for each engine stroke and on the basis of the engine parameters, processes the engine operating conditions and from this the injection time (Tj) relating to the cylinder in its induction stroke during that engine phase, and a block (57) which calculates a new injection time (Tj01) for each engine phase as a function of the injection time (Tj) calculated on the basis of the engine conditions and one of the said second coefficients (Ko), and which further controls, for the cylinder in its induction stroke, a fuel mixture injection according to the new injection time (Tj0).
- Apparatus according to at least one of the preceding claims, characterised in that it includes means varying during the change from normal mixture-delivery condition to fuel cut-off condition, the control of a fuel delivery pump (6).
- Apparatus according to at least one of the preceding claims, characterised in that it comprises means varying during the change from mixture cut-off condition to normal fuel-delivery condition, the control of a fuel delivery pump (6).
- Apparatus according to at least one of the preceding claims, characterised in that it includes means varying during the change from normal mixture-delivery condition to fuel cut-off condition, the control of an electronic ignition device (5) to modify the ignition advance.
- Apparatus according to at least one of the preceding claims, characterised in that it includes means varying during the change from mixture cut-off condition to normal fuel-delivery condition, the control of an electronic ignition device (5) to modify the ignition advance.
- Apparatus according to at least one of the preceding claims, characterised that it includes means (8) for indicating the fuel/air mixture cut-off condition to the user.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITBO930389 | 1993-09-30 | ||
IT93BO000389A IT1264227B1 (en) | 1993-09-30 | 1993-09-30 | SYSTEM FOR VARIATION OF ENGINE TORQUE IN PARTICULAR OPERATING CONDITIONS OF AN INTERNAL ICE ENGINE OF A VEHICLE. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0646712A1 EP0646712A1 (en) | 1995-04-05 |
EP0646712B1 true EP0646712B1 (en) | 1998-12-16 |
Family
ID=11339246
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94115403A Expired - Lifetime EP0646712B1 (en) | 1993-09-30 | 1994-09-29 | Apparatus for varying the engine torque in particular operating states of an internal combustion engine |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0646712B1 (en) |
BR (1) | BR9403625A (en) |
DE (1) | DE69415257T2 (en) |
ES (1) | ES2127864T3 (en) |
IT (1) | IT1264227B1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4445462B4 (en) * | 1994-12-20 | 2008-03-13 | Robert Bosch Gmbh | Method and device for controlling an internal combustion engine of a vehicle |
JP3578071B2 (en) * | 2000-09-14 | 2004-10-20 | トヨタ自動車株式会社 | Control device for variable cylinder engine and control device for vehicle |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5820374B2 (en) * | 1977-10-11 | 1983-04-22 | 日産自動車株式会社 | Electronically controlled fuel injection device for internal combustion engines |
DE2801790A1 (en) * | 1978-01-17 | 1979-07-19 | Bosch Gmbh Robert | METHOD AND EQUIPMENT FOR CONTROLLING THE FUEL SUPPLY TO A COMBUSTION ENGINE |
JPS54145819A (en) * | 1978-05-04 | 1979-11-14 | Nippon Denso Co Ltd | Engine control |
JPS59185833A (en) * | 1983-04-06 | 1984-10-22 | Honda Motor Co Ltd | Fuel feed control method of internal-combustion engine |
JPS606033A (en) * | 1983-06-16 | 1985-01-12 | Honda Motor Co Ltd | Control method of amount of air sucked to internal- combustion engine |
US5119781A (en) * | 1991-02-28 | 1992-06-09 | General Motors Corporation | Control of engine fuel injection during transitional periods associated with deceleration fuel cut-off |
-
1993
- 1993-09-30 IT IT93BO000389A patent/IT1264227B1/en active IP Right Grant
-
1994
- 1994-09-26 BR BR9403625A patent/BR9403625A/en unknown
- 1994-09-29 EP EP94115403A patent/EP0646712B1/en not_active Expired - Lifetime
- 1994-09-29 ES ES94115403T patent/ES2127864T3/en not_active Expired - Lifetime
- 1994-09-29 DE DE69415257T patent/DE69415257T2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
BR9403625A (en) | 1995-05-30 |
DE69415257T2 (en) | 1999-07-01 |
DE69415257D1 (en) | 1999-01-28 |
ITBO930389A1 (en) | 1995-03-30 |
EP0646712A1 (en) | 1995-04-05 |
IT1264227B1 (en) | 1996-09-23 |
ES2127864T3 (en) | 1999-05-01 |
ITBO930389A0 (en) | 1993-09-30 |
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