EP1585895A1 - Method for calculating pressure fluctuations in a fuel supply system of an internal combustion engine operating with direct injection of fuel and for controlling the injection valves thereof - Google Patents
Method for calculating pressure fluctuations in a fuel supply system of an internal combustion engine operating with direct injection of fuel and for controlling the injection valves thereofInfo
- Publication number
- EP1585895A1 EP1585895A1 EP04704585A EP04704585A EP1585895A1 EP 1585895 A1 EP1585895 A1 EP 1585895A1 EP 04704585 A EP04704585 A EP 04704585A EP 04704585 A EP04704585 A EP 04704585A EP 1585895 A1 EP1585895 A1 EP 1585895A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- injection
- fuel
- pressure
- fourier
- actuation
- 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
- 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
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/3809—Common rail control systems
- F02D41/3836—Controlling the fuel pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
- F02D2041/1413—Controller structures or design
- F02D2041/1429—Linearisation, i.e. using a feedback law such that the system evolves as a linear one
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
- F02D2041/1433—Introducing closed-loop corrections characterised by the control or regulation method using a model or simulation of the system
-
- 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
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
- F02D41/28—Interface circuits
- F02D2041/286—Interface circuits comprising means for signal processing
- F02D2041/288—Interface circuits comprising means for signal processing for performing a transformation into the frequency domain, e.g. Fourier transformation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0602—Fuel pressure
- F02D2200/0604—Estimation of fuel pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2250/00—Engine control related to specific problems or objectives
- F02D2250/04—Fuel pressure pulsation in common rails
Definitions
- the invention relates to a method for calculating pressure fluctuations in a fuel supply system of an internal combustion engine working with direct fuel injection and for controlling its injection valves.
- the common rail injection system known per se is used above all. At least for the latter, multiple injection methods are known, with which to improve the mixture preparation and Combustion process the amount of fuel required for an operation in an engine cylinder is injected in, for example, three partial injection processes.
- a pre-injection improves the mixture preparation and thus the onset of combustion during the main injection.
- Post-injection of fuel ultimately serves primarily to improve the exhaust gas behavior of the internal combustion engine.
- Injection systems with multiple injection methods occur during the injection processes, pressure waves in the lines leading to the injection nozzles, which in the worst case reduce the nominal value of the injection pressure and thus have a negative effect on the efficiency and reliability of the injection system of the internal combustion engine. For example, it may happen that the required target injection pressure is not available at the injection nozzle during an injection process and therefore the desired amount of fuel is not injected for a given injection duration. Depending on the pressure wave phase, this can lead to both an oversupply and an undersupply of fuel as well as different injection pressures. This worsens the drive power and the nominal exhaust gas behavior of the internal combustion engine.
- pressure waves are also generated by all other actuation processes of the injection valves of the injection system, so that a large number of partial pressure waves overlap in the injection system.
- the control device mentioned for adapting the injection duration of a partial fuel injection does not solve the problem of the fuel supply to the cylinder caused by the pressure waves solved sufficiently.
- a compensation device in which a piezo actuator applies the frequency of a fuel pressure wave by converting the mechanical force exerted on this sensor. true, converted into an electrical signal and made available to a control device.
- This control device uses this frequency information and the knowledge of the undisturbed start of injection and the undisturbed end of injection of the injection valve to adjust the level of the injection pressure of the following injection process.
- a method for determining the injection time in an internal combustion engine working with direct fuel injection is known, with which the pressure fluctuations occurring in the feed line to an injection valve during two successive injection processes within the same working cycle of the cylinder with a mathematical correction term be taken into account.
- the actuation time for the injection valves is then changed with the corrected pressure value, so that the correct amount of fuel is injected.
- the correction term is determined by means of a so-called ⁇ least squares estimator "which, depending on the geometric data of the fuel injection system, such as the length of the supply line from the common supply line to the injection valve, and the properties of the fuel determine the probable injection pressure at the Fuel injector nozzle estimates.
- DE 199 50 222 AI describes a method by which Fourier analysis of the fuel pressure in a high-pressure fuel supply system of a direct-injection internal combustion engine is intended to determine the defect-free functioning of components of this system. It is not a question of fuel pressure fluctuations, which are primarily or secondarily caused by a functionally correct actuation of the fuel injection valves, but rather those which arise due to incorrect behavior of components in the fuel supply system.
- DE 197 40 608 AI discloses a method for determining at least one fuel injection-related parameter for an internal combustion engine with a common rail injection system. With this procedure the
- Pressure in the manifold pressure chamber of the common rail injection system that is jointly assigned to the engine combustion chambers is detected in its course by means of a pressure sensor of the distributor pressure chamber via a respective injection curtain for a respective combustion chamber. From this pressure curve an associated pressure curve pattern is obtained, from which the at least one fuel-related parameter is indi- is determined for each combustion chamber and each injection process.
- the object of the invention is to present a method for reducing the effects of the pressure waves described at the outset, with which the efficiency of the internal combustion engine is further increased and the reliability of the overall system comprising the internal combustion engine and the fuel injection system is improved.
- This method should also be usable for fuel injection systems of different dimensions without major changes.
- the method according to the invention is based on the knowledge that the fuel pressure vibrations occurring in a direct injection fuel injection system can be reliably described in the steady state with the aid of a Fourier analysis.
- the temporal fluctuations in the fuel pressure and thus in the fuel volume flow when the injection valve is open are also not considered for the entire fuel supply system, but only for predefined fixed points in the area of the lines and for predefined volumes. These points are nodes in a one-dimensional grid, which is conceptually spanned in the injection line system and to which the continuity equations are applied to describe the temporal development of the system. By definition, the pressure vibration analyzes performed for these nodes also apply to all other locations in the injection system under consideration.
- the fuel injection system should not actually be considered as an isolated system. Rather, in the fuel injection system, in addition to the oscillation typical in an isolated system, there are also those which are generated by the external excitation of the valve actuation.
- the pressure of the fuel also oscillates after a certain excitation time around its equilibrium value (ie the static pressure) with the same period as the external excitation source.
- the time dependence of this oscillation can be calculated using the mathematical method of the Fourier transform.
- the injection system can be regarded as a high-pressure hydraulic system that has settled after a few work cycles of the internal combustion engine, in which the geometric Properties of the spray system and the properties of certain types of fuel are constants.
- the actuation of the injection valves represents an external source of excitation for the fuel pressure oscillations in the injection system.
- the method of the transfer function is used to determine the fuel pressure vibrations occurring in such an injection system, the response function of which indicates the sum of the amplitudes and phases of the pressure wave with which it vibrates around the target pressure in the fuel supply system.
- the pressure oscillation phases and pressure oscillation amplitudes calculated in this way are then compared with target values for the actuation times, the fuel injection pressure and / or the injection volume.
- at least one correction value is then calculated from the deviation for the originally intended actuation time, the originally intended actuation duration and / or the originally intended injection volume.
- at least one of the previous target values mentioned is changed by applying a correction value for the next and / or all subsequent injection processes in such a way that the disadvantages arising from the fuel pressure oscillation are compensated for.
- This method also uses the equation to determine the time dependence of the fuel pressure and / or the fuel volume flow / ⁇ 2 ⁇ - n - t
- n 0 • t ⁇ , 2 ⁇ - n - t, i ⁇
- X k , 0 means the equilibrium value of the component X k of the state variable X for the pressure and the volume flow
- 1 the number of non-zero components of the state variable of the external excitation F
- X n the Fourier components of the amplitude value and the Fourier components of the phase value between the k-th state variable and the i-th control variable
- f cn and c l n the coefficients of the Fourier transformation of the control variable i
- t the time
- T the period of a fuel pressure oscillation
- Cosine and sine components as well as n an integer index value.
- a specific control process can include the following process steps:
- the geometric parameters of the injection system and / or the properties of the fuel are preferably specified as constants, although these can also be determined at suitable time intervals by means of suitable measuring devices.
- X should be referred to as the vector which specifies the pressure and volume flow values at the aforementioned nodes of the injection system.
- the components X k of the vector X are referred to as state variables of the fuel. The derivation of the vector X over time then applies
- A is a matrix which specifies the geometric parameters of the system and the liquid properties of the fuel
- F (t) is the vector of the actuation process of the injection valves or, in particular, the vector of the injected liquid quantity at the respective injection valves.
- the components of F (t) are periodic functions and are referred to as control variables, all of which have the same period T and generally have different phase positions from one another.
- fj (t) can be viewed as a periodic function which is due to an i-th injection process and is broken down into its cosine and sine components.
- ti may be required to shift the range of values of the variability range from f (t) to (-T / 2, T / 2).
- amplitudes and phases of the vibrations can be calculated between the control variable and the state variable X k at the frequency f n with the formalism of the Fourier transform.
- the Fourier transformation is always calculated numerically, even if, in certain cases, an approximate analytical expression could be given for certain variables or constants.
- each Fourier component of the injected flow induces an oscillation of the volume flow and of the pressure at the node in question, the phase and amplitude of which are known. Since this system is linear, the time behavior of Xk can be viewed as the sum of all contributions of the Fourier components of the control variables.
- the index s and the index c represent the coefficients of the cosine and sine components.
- t stands for the time elapsed between two injection processes on the same injection valve
- ⁇ t for the injection duration
- Qi nj for the maximum fuel volume flow at the injection valve.
- the injection duration ⁇ t and the maximum volume flow Q in j were set so that the correct injection quantity was available at the operating point of the cylinder under consideration.
- the point in time t a at which the fuel is injected into the cylinder was chosen so differently for each of the injection valves that the correct injection sequence was obtained.
- the cycle duration T was also calculated so that the desired engine speed was set.
- FIG. 2 shows the graphically plotted percentage error between the pressure profiles of the comparison calculations shown in FIG. 1.
- FIG. 2 shows how well the calculated pressure fluctuations actually match between the complex simulation program 'Arnesim' and the method according to the invention, which works much faster and requires less injection system data, in which the percentage error between the two calculation methods for a common rail System in connection with a four-cylinder internal combustion engine is shown during a complete injection period with a length of 0.1 second. As this error history shows, this error never exceeds the value of 0.09%, which is a very good match between the Results of both calculation methods can be determined.
- the proposed method for determining the pressure fluctuations can advantageously be used in open-loop and closed-loop control methods for actuating the injection valves of direct-injection fuel injection systems. These systems can be both common rail and pump-injector systems. It is particularly advantageous in the calculation method according to the invention that the correction of the injection times can be calculated analytically using a formula which contains a clear and explicit dependency on the system geometry and the injection characteristic.
- the frequencies, amplitudes and phases that are used in this mathematical expression to calculate the pressure fluctuations and for the injection timing and, if necessary, injection duration correction are predetermined a priori by the injection system and do not have to be determined by continuously repeated measurements.
- Standard means for simulating hydraulic systems are available. Therefore, the calculation time in the simulation of injection processes in stationary operating points of an internal combustion engine can be reduced considerably.
- this calculation can also be carried out using a vehicle computer, for example when starting up for the first time or at predetermined intervals while the vehicle is in operation. In the latter case, it is preferable to determine only the viscosity of the fuel and to perform a one-time simulation run.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2003102806 DE10302806B4 (en) | 2003-01-24 | 2003-01-24 | Method for calculating pressure fluctuations in a fuel supply system of an internal combustion engine working with direct fuel injection and for controlling its injection valves |
DE10302806 | 2003-01-24 | ||
PCT/EP2004/000581 WO2004065775A1 (en) | 2003-01-24 | 2004-01-23 | Method for calculating pressure fluctuations in a fuel supply system of an internal combustion engine operating with direct injection of fuel and for controlling the injection valves thereof |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1585895A1 true EP1585895A1 (en) | 2005-10-19 |
EP1585895B1 EP1585895B1 (en) | 2006-05-24 |
Family
ID=32694957
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04704585A Expired - Fee Related EP1585895B1 (en) | 2003-01-24 | 2004-01-23 | Method for calculating pressure fluctuations in a fuel supply system of an internal combustion engine operating with direct injection of fuel and for controlling the injection valves thereof |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1585895B1 (en) |
DE (1) | DE10302806B4 (en) |
WO (1) | WO2004065775A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113062811A (en) * | 2021-03-08 | 2021-07-02 | 哈尔滨工程大学 | Method for identifying key time characteristics of oil injection process according to frequency spectrum characteristics of pressure signal at inlet of oil injector |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004057963A1 (en) * | 2004-12-01 | 2006-06-08 | Robert Bosch Gmbh | Method and device for exciting pressure fluctuations in a fuel supply system of an internal combustion engine |
DE102005056704B4 (en) * | 2005-11-28 | 2013-05-29 | Continental Automotive Gmbh | A method for achieving a scheduled injection amount of fuel in an internal combustion engine |
DE102006033459B3 (en) * | 2006-07-19 | 2007-10-31 | Siemens Ag | Operating method for IC engines with fuel injection valves comprises determining point at which pressure fluctuations in fuel appear and calculating period from start of injection, correction being used to derive corrected injection time |
DE102006034514B4 (en) | 2006-07-26 | 2014-01-16 | Mtu Friedrichshafen Gmbh | Method for controlling an internal combustion engine |
DE102007045606B3 (en) * | 2007-09-25 | 2009-02-26 | Mtu Friedrichshafen Gmbh | Method for controlling and regulating internal combustion engine with common rail system, involves filtering individual accumulator pressure within time frame in measuring interval after end of injection of main injection |
DE102007060768B4 (en) | 2007-12-17 | 2024-06-13 | Robert Bosch Gmbh | Methods for drift detection and drift compensation of injectors |
DE102010001387A1 (en) | 2010-01-29 | 2011-08-04 | Robert Bosch GmbH, 70469 | Method and device for testing a fuel injector |
DE102010029064A1 (en) * | 2010-05-18 | 2011-11-24 | Robert Bosch Gmbh | Method for monitoring fuel injection valve of injection device of internal combustion engine, involves carrying out opening and closing events by periodic pressurization when periodic change of pressure is detected in line |
DE102010030545B4 (en) | 2010-06-25 | 2016-12-08 | Continental Automotive Gmbh | Method for controlling a fuel injection system of an internal combustion engine |
US8608127B2 (en) | 2011-01-24 | 2013-12-17 | Fluke Corporation | Piezoelectric proportional control valve |
GB2523318A (en) * | 2014-02-19 | 2015-08-26 | Gm Global Tech Operations Inc | Method of operating an internal combustion engine |
DE102014225530A1 (en) | 2014-12-11 | 2016-06-16 | Robert Bosch Gmbh | Method for operating a fuel injector |
DE102015111209B4 (en) * | 2015-07-10 | 2017-02-16 | Denso Corporation | Technique for detecting pressure changes in a fuel supply system as a result of pumping |
DE102015226138B3 (en) | 2015-12-21 | 2016-12-29 | Continental Automotive Gmbh | Method for determining the composition of the fuel used to operate an internal combustion engine |
JP6281581B2 (en) * | 2016-01-27 | 2018-02-21 | トヨタ自動車株式会社 | Control device for internal combustion engine |
DE102017209386B4 (en) * | 2017-06-02 | 2024-05-08 | Vitesco Technologies GmbH | Method for determining the current trim of the intake tract of an internal combustion engine during operation |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19740608C2 (en) * | 1997-09-16 | 2003-02-13 | Daimler Chrysler Ag | Method for determining a fuel injection-related parameter for an internal combustion engine with high-pressure accumulator injection system |
WO1999047802A1 (en) * | 1998-03-16 | 1999-09-23 | Siemens Aktiengesellschaft | Method for determining the injection time in a direct injection internal combustion engine |
DE19950222A1 (en) * | 1999-10-19 | 2001-04-26 | Bosch Gmbh Robert | Procedure for diagnosis of fuel supply system of IC engine has recording of variation of fuel pressure in system, formation of frequency spectrum of fuel pressure variation and analysis thereof |
DE10055192C2 (en) * | 2000-11-07 | 2002-11-21 | Mtu Friedrichshafen Gmbh | Concentricity control for diesel engines |
DE10217592A1 (en) * | 2002-04-19 | 2003-11-06 | Siemens Ag | Injector for the injection of fuel |
-
2003
- 2003-01-24 DE DE2003102806 patent/DE10302806B4/en not_active Expired - Fee Related
-
2004
- 2004-01-23 WO PCT/EP2004/000581 patent/WO2004065775A1/en active IP Right Grant
- 2004-01-23 EP EP04704585A patent/EP1585895B1/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2004065775A1 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113062811A (en) * | 2021-03-08 | 2021-07-02 | 哈尔滨工程大学 | Method for identifying key time characteristics of oil injection process according to frequency spectrum characteristics of pressure signal at inlet of oil injector |
CN113062811B (en) * | 2021-03-08 | 2022-02-22 | 哈尔滨工程大学 | Method for identifying key time characteristics of oil injection process according to frequency spectrum characteristics of pressure signal at inlet of oil injector |
Also Published As
Publication number | Publication date |
---|---|
DE10302806B4 (en) | 2004-12-09 |
DE10302806A1 (en) | 2004-08-12 |
WO2004065775A1 (en) | 2004-08-05 |
EP1585895B1 (en) | 2006-05-24 |
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