WO1997016637A2 - Verfahren zur lasteinstellung einer brennkraftmaschine, insbesondere für ein kraftfahrzeug - Google Patents
Verfahren zur lasteinstellung einer brennkraftmaschine, insbesondere für ein kraftfahrzeug Download PDFInfo
- Publication number
- WO1997016637A2 WO1997016637A2 PCT/DE1996/001913 DE9601913W WO9716637A2 WO 1997016637 A2 WO1997016637 A2 WO 1997016637A2 DE 9601913 W DE9601913 W DE 9601913W WO 9716637 A2 WO9716637 A2 WO 9716637A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- value
- opening
- throttle valve
- intake duct
- obw
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
- F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
- F02D11/10—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
- F02D11/105—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type characterised by the function converting demand to actuation, e.g. a map indicating relations between an accelerator pedal position and throttle valve opening or target engine torque
-
- 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
- F02D41/18—Circuit arrangements for generating control signals by measuring intake air flow
- F02D41/187—Circuit arrangements for generating control signals by measuring intake air flow using a hot wire flow sensor
Definitions
- the invention relates to a method for load adjustment of an internal combustion engine, in particular for a motor vehicle, according to the preamble of claim 1.
- the invention is based on a throttle valve control according to DE 42 23 253.
- a control unit electronic engine power control
- This forms a setpoint for the opening angle of the throttle valve at least as a function of the position of the accelerator pedal. This serves as a reference variable for a position controller, which controls an electromotive actuator for setting the opening angle of the throttle valve.
- fuel metering systems require precise information about the air mass sucked in by the internal combustion engine per stroke. They receive this information via a rapidly responding air mass sensor which works, for example, according to the hot film principle.
- the output signal of the air mass sensor follows any pulsation in the air flow due to its high response speed. Returning air masses are also recorded - albeit with the wrong sign.
- a method for reducing the pulsations in the area of the intake duct in which the air mass sensor is arranged is known from DE 42 39 842. This method is based on the knowledge that the backflow has a fixed time-related relationship to the crankshaft position. The frequency of the backflow of the air masses thus corresponds to the speed of the internal combustion engine. With this method, the opening angle of the throttle valve is changed with each flow reversal. Thus, it is moved in the "closing" direction when the air mass flows back and in the "open” direction when the air mass flows in.
- a maximum opening angle is determined depending on the speed.
- the opening angle of the throttle valve is regulated in the sense of a minimal fuel consumption with the proviso that the maximum opening angle is not exceeded. Abrupt changes in the power output of the internal combustion engine are thus prevented.
- the object of the invention is to provide a simple method by which pulsations are avoided that occur upstream of a throttle valve in an intake duct of an internal combustion engine.
- FIG. 1 a block diagram of an arrangement in which the method according to the invention is used
- FIG. 2 an exemplary course of an opening characteristic
- FIG. 3 an exemplary map
- FIG. 4 a flow chart of the method according to the invention
- FIG. 5 a second flow chart of the method according to the invention.
- 6a, 6b a third flow chart of the method according to the invention.
- An engine control system (FIG. 1) has an accelerator pedal 1 with an encoder 2 which detects the position of the accelerator pedal 3.
- the transmitter 2 is electrically conductively connected to a control unit 3.
- the control unit 3 detects the ambient pressure via a pressure sensor 4 or derives it from auxiliary variables.
- a temperature sensor 5 and an air mass sensor 6 are arranged in an intake duct 7 and connected to the control unit 3 in an electrically conductive manner.
- the temperature sensor 5 detects the temperature of the air in the intake duct 7.
- the air mass sensor 6 detects the intake air mass.
- a throttle valve 8 is arranged in the intake duct 7 downstream of the air mass sensor 6.
- the throttle valve 8 is adjustable by an electric motor drive 9.
- the intake duct 7 is connected to an internal combustion engine 10.
- FIG. 2 shows a full load line VL with full load values of the opening angle of the throttle valve 8 as a function of the speed n.
- a maximum filling hereinafter referred to as motor full load
- the full load line VL increases approximately linearly with the speed n until it reaches the value of the maximum opening angle of the throttle valve 8 at high speeds n.
- Pulsations can only occur at a certain speed n if the opening angle of the throttle valve 8 is greater than a pulsation value. These pulsation values, plotted as a function of the speed n, result in a pulsation line PL.
- Pulsations occur at low to medium speeds n. They are particularly pronounced in internal combustion engines 10 with up to four cylinders. It can be seen from FIG. 2 that at every speed n the pulsation value is greater than the full load value or equal to the full load value if the full load value has the value of the maximum opening angle of the throttle valve.
- the method according to the invention is based on an opening characteristic line OK which is placed between the full load line VL and the pulsation line PL and from which an opening base value OBW can be determined for each speed n, which is between the associated full load value on the full load line VL and the pulsation value belonging to this speed lies on the pulsation line PL.
- the full load line, the pulsation line and the opening characteristic curve OK apply to a tuning temperature of the air in the intake duct 7 (e.g. 20 ° C) and for a tuning pressure of the ambient pressure (e.g. 1000 mbar). If the temperature and / or the ambient pressure deviate from these tuning values, a corresponding correction is necessary.
- the opening angle of the throttle valve 8 operated by an electric motor is set to a speed-dependent opening value OW limited, which corresponds to the opening base value OBW for these tuning values.
- a first property value KW1 is determined from a map KF (FIG. 3) as a function of the temperature and the ambient pressure.
- the opening value OW is adapted to the ambient pressure and the temperature in the respective operating state of the internal combustion engine 10.
- the first correction value KW1 has the value zero for the tuning temperature and the tuning pressure.
- a higher ambient pressure than the tuning pressure results in a reduction of the first correction value KW1, an increase in the temperature compared to the tuning temperature causes an increase in the first correction value KW1.
- the method according to the invention (FIG. 4) is started in step S1.
- the opening characteristic curve OK is selected in step S2. If the engine control system has an intake duct 7 with a variable effective length or intake valves with a variable valve timing, an opening characteristic curve OK is permanently stored for each effective length of the intake duct 9 or for each valve timing.
- a variable valve timing is a change in the opening or closing timing of the intake valves relative to the associated crankshaft angles.
- the variable valve timing can be obtained, for example, with a camshaft that has differently designed cams, or with electronically controlled intake valves.
- step S3 the opening base value OBW is determined.
- the speed n is detected, for example, by a speed sensor on the crankshaft.
- the associated opening base value OBW is then determined on the opening characteristic curve OK as a function of the speed n.
- step S4 the first correction value KW1 is determined as a function of the temperature in the intake duct 7 and the ambient pressure from the map KF. Then, in step S5, the sum of the opening base value OBW and the first correction value KW1 is assigned to the opening value OW.
- step S6 it is checked whether a target value SW, which is formed as a function of the position of the accelerator pedal 1, is greater than the opening value OW. If this is the case, a branch is made to step S7. Otherwise the program branches to step S8. There, the opening value OW is assigned to the setpoint SW and thus the setpoint SW is limited to the opening value OW.
- step S8 the throttle valve 8 is set to the opening angle which corresponds to the desired value SW.
- the setpoint SW is used as a reference variable for a position controller which regulates the opening angle of the throttle valve 8. The method is ended in step S9.
- the method is such that the opening base values OBW are only slightly below the associated pulsation values.
- step S4a the method is continued in step S4a.
- the second correction value KW2 is determined from an adaptation table as a function of the speed.
- the adaptation table is stored in a memory for each effective length of the intake duct 7 and for each valve timing and can be changed.
- the second correction value KW2 takes into account production tolerances and age-related changes in the internal combustion engine 10 and in the intake duct 7, which can result in a shift in the pulsation line.
- step S5a the sum of the opening base value OBW, the first correction value KW1 and the second correction value KW2 is assigned to the opening value OW.
- Method step S8 in which the throttle valve 8 is set, is followed by method step S12. There it is checked whether there is a pulsation in the intake duct 7 upstream of the throttle valve 8.
- a known method such as e.g. is disclosed in EP 0575635. Since this method is not essential to the invention, it is not described further below.
- step S12 If a pulsation is detected in step S12, a branch is made to step S10. There the old setpoint SW is assigned to the setpoint SW reduced by a delta value DW.
- the delta value DW is a fixed, predetermined positive value.
- step S11 the second correction value KW2 is reduced by the delta value DW. After step S11, the method is continued again in step S8.
- step S12 If no pulsation is detected in step S12, a branch is made to step S13 and the second control value KW2 is stored there.
- the adaptation table is thus adapted.
- the method is ended in step S9. This method ensures that the second correction value KW2 is adapted so that the opening angle which corresponds to the opening value OW does not lie in the pulsation.
- FIGS. 6a and 6b the method steps provided with the same reference symbols are identical to those from FIG. 5. They are therefore not described further below.
- step S7 is followed by step S14, in which the throttle valve is set analogously to step S8.
- step S15 it is checked whether the target value SW is greater than or equal to a maximum opening value OWmax, which corresponds to the maximum opening angle of the throttle valve. If this is the case, the process branches to step S12. Otherwise the program branches to step S16.
- step S12 it is checked whether there is a pulsation upstream of the throttle valve 8 in the intake duct 7. If this is not the case, a branch is made to step S17, in which the target value SW is increased by the delta value DW. Otherwise the program branches to step S10.
- step S18 the second correction value KW2 is increased by the delta value DW.
- the method then continues in step S14.
- the second correction value is adjusted so that the opening angle, which corresponds to the opening value OW, is just below the opening angle of the throttle valve, at which pulsations occur or at which the maximum opening angle is reached. Manufacturing tolerances and age-related changes can thus be taken into account.
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 Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP96943864A EP0858554B1 (de) | 1995-10-30 | 1996-10-04 | Verfahren zur lasteinstellung einer brennkraftmaschine, insbesondere für ein kraftfahrzeug |
DE59602657T DE59602657D1 (de) | 1995-10-30 | 1996-10-04 | Verfahren zur lasteinstellung einer brennkraftmaschine, insbesondere für ein kraftfahrzeug |
US09/070,405 US5992384A (en) | 1995-10-30 | 1998-04-30 | Method for adjusting the load of an internal combustion engine, in particular for a motor vehicle |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19540832A DE19540832C1 (de) | 1995-10-30 | 1995-10-30 | Verfahren zur Lasteinstellung einer Brennkraftmaschine, insbesondere für ein Kraftfahrzeug |
DE19540832.2 | 1995-10-30 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/070,405 Continuation US5992384A (en) | 1995-10-30 | 1998-04-30 | Method for adjusting the load of an internal combustion engine, in particular for a motor vehicle |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1997016637A2 true WO1997016637A2 (de) | 1997-05-09 |
WO1997016637A3 WO1997016637A3 (de) | 1997-07-10 |
Family
ID=7776440
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1996/001913 WO1997016637A2 (de) | 1995-10-30 | 1996-10-04 | Verfahren zur lasteinstellung einer brennkraftmaschine, insbesondere für ein kraftfahrzeug |
Country Status (4)
Country | Link |
---|---|
US (1) | US5992384A (de) |
EP (1) | EP0858554B1 (de) |
DE (2) | DE19540832C1 (de) |
WO (1) | WO1997016637A2 (de) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3837819B2 (ja) * | 1997-03-19 | 2006-10-25 | 株式会社デンソー | 内燃機関用バルブタイミング制御装置 |
JPH1113518A (ja) * | 1997-06-27 | 1999-01-19 | Aisin Seiki Co Ltd | スロットルバルブ制御装置 |
FR2766872B1 (fr) * | 1997-08-01 | 1999-10-15 | Renault | Procede de correction des a-coups de couple d'un moteur a combustion interne |
JP3593896B2 (ja) * | 1998-09-17 | 2004-11-24 | 日産自動車株式会社 | エンジンの制御装置 |
US6112724A (en) * | 1998-12-08 | 2000-09-05 | Ford Global Technologies, Inc. | Throttle position filtering method |
US6526941B1 (en) * | 2001-08-14 | 2003-03-04 | Visteon Global Technologies, Inc. | Dynamic electronic throttle position feedforward system |
DE10308497A1 (de) * | 2003-02-26 | 2004-09-09 | Robert Bosch Gmbh | Verfahren und Vorrichtung zur Detektion der Betätigung eines Bedienelementes |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4377995A (en) * | 1979-06-28 | 1983-03-29 | Volkswagenwerk Aktiengesellschaft | Method and arrangement for operation of an internal combustion engine of a vehicle |
US4781162A (en) * | 1986-08-04 | 1988-11-01 | Honda Giken Kogyo Kabushiki Kaisha | Throttle valve control system for an internal combustion engine |
EP0344772A2 (de) * | 1988-06-03 | 1989-12-06 | Hitachi, Ltd. | Verfahren und Gerät zur Steuerung der Drosselklappe von Brennkraftmaschinen |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5696132A (en) * | 1979-12-28 | 1981-08-04 | Honda Motor Co Ltd | Engine controller |
EP0575635B1 (de) * | 1992-05-27 | 1998-01-07 | Siemens Aktiengesellschaft | Messung des pulsierenden Luftmassestroms im Ansaugrohr einer Brennkraftmaschine |
DE4223253C2 (de) * | 1992-07-15 | 1996-04-11 | Bosch Gmbh Robert | Steuereinrichtung für ein Fahrzeug |
DE4239842A1 (de) * | 1992-11-27 | 1994-06-01 | Bosch Gmbh Robert | Verfahren und Vorrichtung zur Steuerung einer Brennkraftmaschine |
US5517410A (en) * | 1993-07-08 | 1996-05-14 | Toyota Jidosha Kabushiki Kaisha | Apparatus for controlling vehicle drive force depending upon vehicle load determined by engine load and vehicle speed |
US5521825A (en) * | 1993-10-06 | 1996-05-28 | General Motors Corporation | Engine inlet air valve positioning |
DE4434022C2 (de) * | 1994-09-23 | 1999-11-11 | Daimler Chrysler Ag | Verfahren und Vorrichtung zur Geschwindigkeitsbegrenzung eines Kraftfahrzeuges |
-
1995
- 1995-10-30 DE DE19540832A patent/DE19540832C1/de not_active Expired - Fee Related
-
1996
- 1996-10-04 EP EP96943864A patent/EP0858554B1/de not_active Expired - Lifetime
- 1996-10-04 DE DE59602657T patent/DE59602657D1/de not_active Expired - Fee Related
- 1996-10-04 WO PCT/DE1996/001913 patent/WO1997016637A2/de active IP Right Grant
-
1998
- 1998-04-30 US US09/070,405 patent/US5992384A/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4377995A (en) * | 1979-06-28 | 1983-03-29 | Volkswagenwerk Aktiengesellschaft | Method and arrangement for operation of an internal combustion engine of a vehicle |
US4781162A (en) * | 1986-08-04 | 1988-11-01 | Honda Giken Kogyo Kabushiki Kaisha | Throttle valve control system for an internal combustion engine |
EP0344772A2 (de) * | 1988-06-03 | 1989-12-06 | Hitachi, Ltd. | Verfahren und Gerät zur Steuerung der Drosselklappe von Brennkraftmaschinen |
Also Published As
Publication number | Publication date |
---|---|
EP0858554A2 (de) | 1998-08-19 |
WO1997016637A3 (de) | 1997-07-10 |
EP0858554B1 (de) | 1999-08-04 |
DE59602657D1 (de) | 1999-09-09 |
US5992384A (en) | 1999-11-30 |
DE19540832C1 (de) | 1997-07-03 |
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