WO2001029408A1 - Method and device for controlling fuel metering in an internal combustion machine - Google Patents
Method and device for controlling fuel metering in an internal combustion machine Download PDFInfo
- Publication number
- WO2001029408A1 WO2001029408A1 PCT/DE2000/003602 DE0003602W WO0129408A1 WO 2001029408 A1 WO2001029408 A1 WO 2001029408A1 DE 0003602 W DE0003602 W DE 0003602W WO 0129408 A1 WO0129408 A1 WO 0129408A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- valve
- injection
- pressure
- internal combustion
- fuel
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/20—Varying fuel delivery in quantity or timing
- F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
- F02M59/366—Valves being actuated electrically
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
- F02M45/12—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship providing a continuous cyclic delivery with variable pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M57/00—Fuel-injectors combined or associated with other devices
- F02M57/02—Injectors structurally combined with fuel-injection pumps
- F02M57/022—Injectors structurally combined with fuel-injection pumps characterised by the pump drive
- F02M57/023—Injectors structurally combined with fuel-injection pumps characterised by the pump drive mechanical
Definitions
- the invention relates to a method and a device for controlling the fuel metering in an internal combustion engine.
- a valve that controls the fuel flow into the internal combustion engine is often used to control the fuel metering. In a first position of the valve, this prevents the fuel flow. In a second position, the valve completely releases the fuel flow.
- piezo actuators are known with which such valves can be controlled.
- the injection pump and the injection nozzle form a structural unit. This is driven by the engine camshaft. Every pump-nozzle unit has a fast-switching valve that controls the start and end of injection. When the valve is open, the PDE feeds fuel back into the inlet. If the valve closes, the PDE measures fuel in the corresponding engine cylinder. The closing time of the valve determines the start of injection, the closing duration, ie the duration of the closed state of the valve, determines the injection quantity.
- a so-called pump-line-nozzle (PLD) system is designed in a similar manner.
- the pump line nozzle has one injection pump per engine cylinder, which is driven by a shaft of the engine, for example the camshaft.
- the injection timing and the injection quantity are controlled with a valve.
- the pump and the nozzle are connected to each other via a short line.
- the object of the invention is to achieve a fuel metering that is as accurate as possible in a method and a device for controlling the fuel metering in an internal combustion engine. This object is achieved by the features characterized in the independent claims.
- Figures 1 and 2 show two configurations of a pump-nozzle Unit and Figures 3 and 4 different signals plotted over time.
- the pump-nozzle unit 100 essentially comprises an actuating element 105 which, via a connection 102, which is shown in broken lines, influences a valve 110 such that it assumes at least a first closed and a second open position.
- the valve 110 is arranged between a fuel inlet 115, which can also be referred to as a low-pressure region, and a line 120.
- the low pressure region essentially contains a fuel reservoir, which is also referred to as a tank, from which the fuel reaches the valve 110 via a filter and a fuel feed pump.
- the line 120 connects an element space 130, in which a pump piston 135, which is moved by a drive unit 140, is movably arranged with an injection nozzle 150.
- the drive unit 140 is preferably driven directly or via a rocker arm by the camshaft of the internal combustion engine.
- the injection nozzle 150 essentially includes a nozzle spring 152 and a nozzle needle 154.
- the control element 105 is acted upon by control signals 160 with control signals. Magnetic actuators and particularly advantageously piezo actuators are usually used as control elements.
- valve 110 If the valve 110 is in its closed state and the pump piston 135 moves in such a way that the element space 130 is reduced, the pressure in the line 120 and thus in the injection nozzle increases. From a - H -
- the pressure of the nozzle needle 154 is moved against the spring force of the nozzle spring 152 and opens the injection opening 156, so that fuel enters the combustion chamber of the internal combustion engine. If the valve 110 is in its open position, no pressure build-up is possible and no fuel injection takes place.
- valve 110 By opening and closing the valve 110, the high-pressure area, which is formed by the element space, the line 120 and the fuel-filled area of the injection nozzle, can be connected to the low-pressure area. From the time valve 110 is closed, pressure build-up begins in the high pressure region and fuel injection begins. When valve 110 opens, the pressure in line 120 decreases and the injection ends. This means that the opening and closing times of the valve 110 determine the start of injection, the end of injection and thus the duration of the injection.
- the control element 105 is controlled by a control unit 160 depending on the operating state of the internal combustion engine, which is detected by various sensors, in such a way that the valve opens or closes at the desired time and thus the injection begins and ends at the desired time.
- FIG. 2 shows a second embodiment of a pump-nozzle unit.
- the valve 110 connects the element space 130 directly to the fuel inlet 115. It is common to both embodiments that the valve 110 connects the high-pressure region to the low-pressure region.
- the valve 110 is usually actuated in such a way that it assumes either its open or its closed position. This type of control is problematic because when the valve is opened, the pressure in the high pressure area is reduced very quickly to the pressure in the low pressure area. This leads, for example, to the nozzle needle moving very quickly into its closed position. When actuated again, the pressure in the high pressure area must be built up again. This is particularly problematic when the injection is divided into at least two partial injections.
- a pre-injection takes place before the main injection.
- the two partial injections for example the pre-injection and the main injection, must follow one another at a certain distance. Due to the complete reduction in pressure when the valve is opened, not all intervals can be realized, since a minimum time is required for the pressure to build up.
- the actuating element is actuated in such a way that the valve opens and closes at least one intermediate position in addition to its two end positions.
- a piezo actuator is used as the control element.
- the position or the extent of the piezo actuator is directly proportional to the voltage applied to the piezo actuator. This makes it possible for the control element to have different positions. sitions can take. This enables the valve 110 to be brought into defined positions.
- the partial figure 3a shows the voltage U, which is present at the piezo actuator 105, is plotted.
- the partial figure 3b shows the state of the valve 110 over the time t.
- the partial figure 3c shows the state of the nozzle needle 154 depending on the time t.
- the partial figure 3d shows the course of the pressure P in the nozzle needle or in the high pressure area.
- control unit 160 specifies such a signal that valve 110 closes. This is achieved in that the voltage at the piezo actuator 105 increases from a minimum value, which is preferably zero, to a second value. In the illustrated embodiment, this increase is linear. The increase in the voltage on the piezo actuator 105 causes the valve 110 to slowly move from its open to its closed position. The nozzle needle shows no reaction yet, it remains in its closed position. The pressure in the high pressure area rises slowly.
- the piezo actuator 105 is activated in such a way that the valve 110 remains in its closed position, ie the voltage U at the piezo actuator remains at its high value. As a result, valve 110 remains in its closed position.
- the pressure P in the high pressure range continues to rise.
- the pressure P reaches such a value that the nozzle needle slowly lifts off its valve seat and releases the fuel injection. This leads to a brief drop in pressure.
- the voltage is reduced to an intermediate value up to time t4, as a result of which valve 110 moves in the direction of a first intermediate position. As a result, the pressure P in the element space drops and the nozzle needle moves in its closing direction.
- valve 110 In the period between times t4 and t5, valve 110 is held in the first intermediate position. This is achieved in that the voltage U on the piezo actuator is kept at its intermediate value. This causes valve 110 to also be in its first intermediate position. The pressure P in the element space slowly decreases and the nozzle needle reaches its closed position and remains in its closed position.
- the voltage and thus the position of the valve and / or the time period between the times t4 and t5 is chosen so that there is no over-relief. This ensures that defined conditions are present at the start of the next injection. Scattering of the fuel quantity can thereby be significantly reduced with the same activation duration.
- the control valve 110 is closed again between the times t5 and t6, ie the voltage at the piezo actuator 105 rises again to its maximum value. As a result, the valve 110 changes to its closed state.
- the pressure P in the pressure area begins to rise again.
- valve 110 is held in its closed position. Ie the voltage at the piezo actuator remains at its maximum value.
- Valve 110 remains in its closed position. As a result, the pressure P rises sharply in the high pressure range. A certain time after the time t6, the value of the pressure has reached such a value that the nozzle needle 154 begins to move and shortly thereafter reaches the fully open state.
- valve 110 is not fully open. This means that valve 110 is held in a second intermediate position which is only slightly different from the closed position. This means that a small amount of liquid can escape.
- the cross section is particularly advantageously selected such that there is no further increase in pressure. This means that the pressure remains almost constant during the period t7 to t8, i.e. that there is a pressure plateau.
- the maximum value of the voltage can be predetermined in the period t7 to t8, as in the period between t6 and t7, the valve 110 remaining in its closed position during this period. This enables higher pressure values to be achieved.
- the voltage is reduced to a third intermediate value.
- the pressure P drops and that at a certain pressure the nozzle needle changes into its closed state. It is particularly advantageous if the value of this voltage can be specified as a function of the operating state. It can thereby be achieved that the pressure reduction rate, ie the pressure change within a certain time, can be predetermined depending on the operating state of the internal combustion engine.
- the valve 110 is held in the third intermediate position between the times t9 and t10.
- the piezo actuator is activated such that the valve 110 opens, i.e. the voltage is reduced to its initial value. As a result, the valve moves to its fully open position. The pressure P drops to the pressure value in the low pressure range and the nozzle needle remains in its closed position.
- the control described includes a main injection as a second partial injection and a pre-injection as a first partial injection.
- This is a remote pilot injection without a so-called over-relief during the injection break. This is achieved in that the valve is controlled between the two partial injections in such a way that it remains in a first intermediate position.
- the invention provides that the pressure in the high-pressure region is preferably limited during the main injection. It is particularly advantageous if ! 0 -
- a large injection pressure is selected at low speeds and / or with small injected fuel quantities, i.e. that during an injection in the partial load range in the period t7 to t ⁇ the valve remains in its completely closed position.
- a limitation of the injection pressure is selected, i.e. that in the period t7 to t8 the valve is in the second intermediate position. This can reduce mechanical loads on the pump and the drive.
- the valve is activated during the injection in such a way that it remains in a second intermediate position.
- the intermediate position or the required voltage on the piezo actuator is preferably specified as a function of the load state, in particular as a function of the rotational speed and / or a variable characterizing the fuel quantity to be injected. This results in improved mixture preparation and thus reduced emissions.
- the pressure reduction rate can be set by specifying the first or the third intermediate position of the valve. This setting is preferably made depending on the operating state of the internal combustion engine. This can take place both at the end of the pre-injection and at the end of the main injection.
- valve 110 is activated at the end of the injection such that it remains in a third intermediate position.
- the intermediate position or the voltage with which the piezo actuator is acted on is preferably set as a function of a desired pressure reduction rate.
- the pressure reduction can be controlled while the valve is opening, the noises, which are preferably generated by the pump, can be significantly reduced.
- the time intervals t4 to t5 or t7 to t8 and t9 to t10 are preferably specified as a function of the speed, the start of injection and / or other operating parameters.
- FIG. 4a shows a conventional control without an intermediate position, ie the voltage is raised to its maximum value for the pre-injection and then lowered to the minimum value.
- the voltage is increased again to the maximum value and reduced to the minimum value at the end of the main injection.
- the course of an attached pre-injection is shown in sub-figure 4b. That is, at the beginning of the pre-injection, the voltage is raised to an intermediate value and then conducted at the maximum value at the beginning of the main injection. The intermediate value is only slightly below the maximum value. At the end of the injection, the voltage is reset to the minimum value.
- a corresponding control with a post-injection is shown in sub-figure 4c. This differs essentially from the control according to FIG. 3 in that the main injection does not cause a reduction in the period between times 7 and t8, but only a flexible pressure reduction rate is set. A short time after the main injection there is a further control to achieve the post-injection.
- the procedure according to the invention is not limited to use in pump-nozzle units. It can also be used in other injection systems that use a valve to control high pressure pressure. In particular, the procedure according to the invention is suitable for controlling a pump-line nozzle system or a common rail system.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001531972A JP2003512563A (en) | 1999-10-16 | 2000-10-12 | Method and apparatus for controlling fuel metering of an internal combustion engine |
DE50011077T DE50011077D1 (en) | 1999-10-16 | 2000-10-12 | METHOD AND DEVICE FOR CONTROLLING FUEL SUPPLY INTO AN INTERNAL COMBUSTION ENGINE |
EP00982995A EP1224392B1 (en) | 1999-10-16 | 2000-10-12 | Method and device for controlling fuel metering in an internal combustion machine |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19950036.3 | 1999-10-16 | ||
DE19950036 | 1999-10-16 | ||
DE10038995.3 | 2000-08-10 | ||
DE10038995A DE10038995A1 (en) | 1999-10-16 | 2000-08-10 | Fuel metering control method for i.c. engine has setting element for fuel feed valve controlled to provide intermediate valve position under given operating conditions |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001029408A1 true WO2001029408A1 (en) | 2001-04-26 |
Family
ID=26006648
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2000/003602 WO2001029408A1 (en) | 1999-10-16 | 2000-10-12 | Method and device for controlling fuel metering in an internal combustion machine |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1224392B1 (en) |
JP (1) | JP2003512563A (en) |
DE (1) | DE50011077D1 (en) |
WO (1) | WO2001029408A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6417971B2 (en) * | 2015-01-28 | 2018-11-07 | 株式会社デンソー | Suction metering valve |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4529164A (en) * | 1982-03-05 | 1985-07-16 | Nippon Soken, Inc. | Piezo-type valve |
DE19729844A1 (en) * | 1997-07-11 | 1999-01-14 | Bosch Gmbh Robert | Fuel injector |
DE19742073A1 (en) * | 1997-09-24 | 1999-03-25 | Bosch Gmbh Robert | Fuel injection arrangement for internal combustion engines |
WO1999018349A1 (en) * | 1997-10-02 | 1999-04-15 | Fev Motorentechnik Gmbh & Co. Kommanditgesellschaft | Directly controlled injection valve, especially a fuel injection valve |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19546033A1 (en) * | 1995-12-09 | 1997-06-12 | Bosch Gmbh Robert | Fuel injection valve for internal combustion engines |
-
2000
- 2000-10-12 DE DE50011077T patent/DE50011077D1/en not_active Revoked
- 2000-10-12 EP EP00982995A patent/EP1224392B1/en not_active Revoked
- 2000-10-12 WO PCT/DE2000/003602 patent/WO2001029408A1/en active Search and Examination
- 2000-10-12 JP JP2001531972A patent/JP2003512563A/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4529164A (en) * | 1982-03-05 | 1985-07-16 | Nippon Soken, Inc. | Piezo-type valve |
DE19729844A1 (en) * | 1997-07-11 | 1999-01-14 | Bosch Gmbh Robert | Fuel injector |
DE19742073A1 (en) * | 1997-09-24 | 1999-03-25 | Bosch Gmbh Robert | Fuel injection arrangement for internal combustion engines |
WO1999018349A1 (en) * | 1997-10-02 | 1999-04-15 | Fev Motorentechnik Gmbh & Co. Kommanditgesellschaft | Directly controlled injection valve, especially a fuel injection valve |
Also Published As
Publication number | Publication date |
---|---|
EP1224392A1 (en) | 2002-07-24 |
JP2003512563A (en) | 2003-04-02 |
DE50011077D1 (en) | 2005-10-06 |
EP1224392B1 (en) | 2005-08-31 |
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