CN108626014A - Common rail system and method for running common rail system - Google Patents
Common rail system and method for running common rail system Download PDFInfo
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- CN108626014A CN108626014A CN201810208429.8A CN201810208429A CN108626014A CN 108626014 A CN108626014 A CN 108626014A CN 201810208429 A CN201810208429 A CN 201810208429A CN 108626014 A CN108626014 A CN 108626014A
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- Prior art keywords
- pressure
- common rail
- control unit
- fuel
- rail system
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-
- 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
- F02D41/3845—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped
-
- 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
- F02D41/1402—Adaptive control
-
- 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
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
-
- 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
- F02D2041/141—Introducing closed-loop corrections characterised by the control or regulation method using a feed-forward control element
-
- 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
- F02D2041/1411—Introducing closed-loop corrections characterised by the control or regulation method using a finite or infinite state machine, automaton or state graph for controlling or modelling
-
- 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
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/021—Engine temperature
-
- 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
-
- 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
- F02D2200/0611—Fuel type, fuel composition or fuel quality
- F02D2200/0612—Fuel type, fuel composition or fuel quality determined by estimation
-
- 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
- F02D2200/60—Input parameters for engine control said parameters being related to the driver demands or status
- F02D2200/602—Pedal position
-
- 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
- F02D2250/31—Control of 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
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Subject of the present invention is a kind of method for running the common rail system of combustion engine, wherein input signal is supplied to the control unit of common rail system and obtains the control signal of the high-pressure pump for common rail system based on the model and input signal that store in a control unit by control unit.Control signal is supplied to high-pressure pump so that high-pressure pump is controlled as, and the specified rail pressure corresponding to input signal is generated in the fuel accumulator of common rail system.The rail pressure of the practical generation in fuel accumulator is obtained by rail pressure sensor and is compared with specified rail pressure.Viscosity correction value is obtained from the deviation of the rail pressure and specified rail pressure that are obtained, viscosity correction value is supplied to control unit and be adapted to the parameter of viscosity considering in a model, for fuel with corresponding.By the model of storage in a control unit, in view of viscosity correction value, the control signal being corrected for high-pressure pump is obtained.
Description
Technical field
The present invention relates to a kind of methods for running the common rail system of combustion engine.The invention additionally relates to one kind
Common rail system.
Background technology
It, should can be for fuel by this method from a kind of method known to 10 2,012 107 596 B4 of document DE
High-pressure pump work in discern whether low-quality fuel being supplied to the high-pressure pump.For example, by using lubricating ability, compression mould
Amount and viscosity are as the parameter for assessing fuel quality.Herein by means of in terms of the lifting moving of the compression device of high-pressure pump
The deviation of actual pressure curve and expecting pressure curve obtains these parameters in discharge chambe.Furthermore it is possible to obtain high-pressure pump
Leakage rate variation, so as to determine lubricating ability, compression modulus and viscosity and it is thus determined that fuel quality.Work as discrimination
When going out to have supplied low-quality fuel, driver can be given a warning and/or by rail pressure, to the control of fuel injector
And/or the control of high-pressure pump is adapted to.
From a kind of Combustion Engine for being adapted for that there is common rail to inject known to 10 2,013 201 500 A1 of document DE
The method of the rail pressure of machine, wherein closing duration behavior (the Schlie β of the anchoring piece from the injector of injected system
Dauerverhalten) viscosity of injected fuel is obtained.In the first model, (first model depends on combustion engine
Or the various operating parameters of injected system) in consider the viscosity that so obtains, change track pressure to correspond to obtained viscosity
Power so that desirable nozzle flow is realized at injector.Injection starting point and/or injection terminal especially may rely on and obtained
Viscosity and change.
A kind of known method for adjusting common rail injector from 10 2,014 204 098 A1 of document DE, wherein using
Pressure in valve chamber of the sensor to measure common rail injector.By means of the time graph of pressure, such as obtains and noted with common rail
Enter the characteristic of the fuel of device injection, such as its viscosity.Then, change cutting for common rail injector dependent on the characteristic obtained
The switching characteristic for changing valve or needle-valve, to match injection behavior.
Invention content
The object of the present invention is to propose a kind of method for running common rail system, this method allows for accordingly accounting for master
The boundary condition led and the method for operation that optimizes are and at the same time cost of implementation is relatively low.It is also object of the invention to propose one kind
Common rail system, the system can be run in the case where accordingly accounting for leading boundary condition in a manner of optimized, and not substantive be carried
The design and/or control cost of high common rail system.
This purpose is achieved from method according to the present invention.In addition, this purpose passes through according to this hair
The bright common rail system is realized.
According to the present invention it is known that the deviation of the rail pressure present in fuel accumulator and specified rail pressure can
It can be caused by following situation：The viscosity of the fuel conveyed from high-pressure pump into fuel accumulator is deposited in the model of common rail system
Storage its k value it is inconsistent, this cause high-pressure pump have the control of error and therefore cause in fuel accumulator with it is specified
The actual track pressure that rail pressure deviates.It is this partially instead of adjusting next (must intervene for a long time) compensation individually through pressure
Difference is obtained to ensure the required subsequent adjustment of high-pressure pump, according to the present invention from the deviation of actual track pressure and specified rail pressure
It obtained viscosity correction value and directly considered the viscosity correction value in a model, produced for high pressure by the viscosity correction value
The control signal of pump.Here, the actual track pressure already existing rail pressure sensing anyway in fuel accumulator
Device obtains, and can be realized in the case of no very big cost for running common rail system by the rail pressure sensor
Optimized method.
In the method for the common rail system according to the present invention for running combustion engine, input signal is supplied to altogether
The control unit of rail system.Not necessarily single input signal herein.But multiple input signal can also be supplied to control
Unit processed.Specifically, information and/or burning that driver inputs (such as drive pedal position) can will be used for by input signal
The boundary condition (such as engine temperature and/or other control parameters) of engine operation is supplied to control unit.
Based on input signal, the control signal of the high-pressure pump for common rail system is produced by means of control unit.For this purpose,
Storage model in a control unit, can be known by the model need how to control high-pressure pump just can guarantee common rail system according to
Input signal is run.Various parameters can be introduced into model at this.On the one hand introduced thereto as variable be contained in it is defeated
Enter the information in signal.On the other hand the parameter of other description common rail systems, the such as leakage of common rail system can be introduced
Rate, by the relationship etc. between the rail pressure in the fuel quantity and fuel accumulator of high-pressure pump conveying.Such description common rail system
The parameter of system for example can have been obtained in the modular form of common rail system or empirical formula characterization in advance.In addition, in model
In in view of fuel for being supplied to common rail system feature parameter, such as the viscosity of fuel.
The control signal generated by control unit is supplied to high-pressure pump so that high-pressure pump is controlled as, in common rail system
Fuel accumulator in generate corresponding to input signal specified rail pressure.In other words, high-pressure pump is controlled as, to fuel storing
It stores in device and conveys a certain amount of fuel, such as obtained by means of the model stored in a control unit based on input signal.
The rail pressure actually generated in fuel accumulator is obtained by rail pressure sensor.Here, according to this hair
It is bright, obtain viscosity correction value from the deviation of the rail pressure and specified rail pressure that are obtained with rail pressure sensor.Viscosity
Correction value gives the deviation of the k value of the conveyed fuel used in a model and the practical k value of fuel.
Pass through the parameter for fuel viscosity that viscosity correction value is supplied to control unit and will be considered in model
It is adapted to corresponding to the viscosity correction value obtained, can subsequently generate the control signal being corrected for high-pressure pump.
That is, obtaining the model being based on for the control signal of high-pressure pump can correspond in the operational process of common rail system
The practical viscosity of fuel and be continuously adapted to, thus, it is possible to realize accurately controlling and therefore to the essence of rail pressure to high-pressure pump
Really setting.Such as the influential exterior temperature change of fuel viscosity will can be accounted for.It can also be by the fortune of common rail system
Row adapts to the fuel type for having different compositions and therefore also having different k values.
Therefore, specifically, actual track pressure and the deviation of specified rail pressure may cause, due to mistake in a model
Ground use viscosity and make common rail system leakage behavior from according to different used by model.Such as than being adopted in a model
Smaller viscosity may lead to the leakage rate improved in terms of the pump of common rail system and/or fueling charger.By right
The k value used in a model should be corrected in the viscosity correction value obtained, then the leakage rate of change can be included in and be examined
Consider, mode is：It generates the modified control signal of correspondence for high-pressure pump and is supplied to the high-pressure pump.
Preferred embodiment according to the method for the present invention, based on the model stored and in view of viscosity correction value
In the case of, control unit not only generates the control signal being corrected for high-pressure pump.But it also generates for controlling fuel note
The control signal of the duration of the start time point, fuel injection that enter and/or the end time point of fuel injection being corrected.
Then it can also compensate for influence of the fuel viscosity changed to injection behavior.Such as it can initially be used in than model lower
Viscosity under the decreased duration that injects fuel into.
It is also possible that the short-term fluctuation for the rail pressure dominated in fuel accumulator, this is simultaneously in the operation of common rail system
Caused by being not necessarily the viscosity variation by fuel.Therefore, embodiment according to the method for the present invention proposes, only when being obtained
Rail pressure when being deviated from the specified rail pressure to a direction on scheduled minimum time section, just the viscosity is repaiied
Positive value is supplied to the control unit.The variation of viscosity is (such as due to fuel temperature and/or follow-up combustion of the supplement with different compositions
Material) lead to the actual track pressure deviateed for a long time with specified rail pressure.That is, produce obtained rail pressure with
The long-term overgauge or minus deviation of specified rail pressure.By waiting for and checking that the deviation is on scheduled minimum time section
It is no consistently to occur in one direction, it can then know whether as since the viscosity different from what is used in a model produces
Raw system deviation.
In order to which more particularly to be corrected in short term in terms of rail pressure, common rail system can have adjuster, by this
Adjuster generates Regulate signal dependent on the deviation of obtained rail pressure and specified rail pressure.In addition to by control unit
Other than the control signal of offer, Regulate signal is also supplied to high-pressure pump, thus can also be used in independent of model
In the case of the adaptation of parameter, the fuel quantity conveyed by high-pressure pump and the track pressure in therefore fuel accumulator are corrected in short time
Power.Then it can for example be realized to track when (duration is less than minimum time section) specified rail pressure of deviation only temporarily
The amendment of pressure.However minimum time section if more than, the then alternatively or additionally viscosity amendment by will be obtained
Value is supplied to control unit to carry out the amendment to deviation.
Other than the work for directly affecting common rail system, the variation of viscosity is also possible to affect indirectly the spy of common rail system
Property.Such as the result of the viscosity of change also has the change of the lubrication property of fuel.It, can in order to compensate the change of lubrication property
To propose, control unit, which depends on, is supplied to the viscosity correction value of the control unit to generate the control letter for lubricant system
Number, so that additional lubricant is supplied to common rail system and therefore adjusts lubrication property according to scheduled ideal value.It is logical
Crossing supply lubricant can for example protect injection part from increased abrasion.
It is received by control unit and the input signal for controlling signal to obtain high-pressure pump dependent on it can be for example comprising pass
In engine speed, the information of specified injected slurry volume and/or specified rail pressure.However can also include letter alternatively or additionally
Breath, such as fuel temperature or engine temperature etc..
The common rail system for combustion engine of the present invention is especially configured to according to according to the method for the present invention
To run.In addition, common rail system has a control unit, which includes interface for receiving input signal and for defeated
Go out to control the interface of signal.Control unit is configured as herein, and control signal is generated based on model and input signal.It will be produced
Raw control signal is supplied to high-pressure pump, can be delivered fuel by the high-pressure pump in the fuel accumulator of common rail system,
So that generating specified rail pressure corresponding with input signal in fuel accumulator.In order to check in fuel accumulator
Existing rail pressure, common rail system have rail pressure sensor, can be obtained there by the rail pressure sensor
Actually active rail pressure.The rail pressure obtained is supplied to processing unit, it can be from being obtained by the processing unit
The deviation of the rail pressure and specified rail pressure that obtain obtains viscosity correction value and the viscosity correction value is supplied to control list
Member, to be adapted to the parameter of viscosity considering in the model, for fuel.
In terms of the preferred embodiment of common rail system of the present invention, the embodiment about the method for the present invention is accordingly fitted
With.
For example, the control unit of common rail injected system can be configured as, in addition to the control being corrected for high-pressure pump
It also generates based on model and in view of viscosity correction value except signal for controlling being corrected for injection process
Control signal.
In addition, common rail system can have adjuster, the adjuster to be configured as, obtained dependent on rail pressure sensor
Rail pressure and the deviation of specified rail pressure generate the Regulate signal particularly for correcting the deviation in short term.Here,
High-pressure pump can receive Regulate signal by the interface being arranged thus so that high-pressure pump is controlled as by controlling signal and tune
Signal is saved to operate, thus can also compensate only temporary rail pressure fluctuation in short time.
Finally, the control unit of common rail system can be configured as, and use is generated dependent on the viscosity correction value obtained
In the control signal of lubricant system, so that additional lubricant is supplied to the common rail system, enabling adaptation lubrication is special
Property.
Description of the drawings
Show that other for improving the present invention are arranged in detail together with by means of Fig. 1 description of the preferred embodiment of the present invention below
It applies.It is shown in figure：
Fig. 1 significantly schematically shows the part of common rail system according to the present invention.
Specific implementation mode
In the Local map of common rail system of the present invention shown in Fig. 1, multiple input signal 5,6,7 is supplied to common rail system
The interface 1,2,3 of the control unit 4 of system.Input signal 5,6,7 can be, for example, about engine speed, specified injected slurry volume with
And the information of specified rail pressure.Alternatively or additionally, can also include other information, such as fuel temperature and/or
Engine temperature.It is different from shown in Fig. 1, input signal can also be received by a shared interface of control unit 4
5、6、7。
It is stored with model in control unit 4, the operation action of common rail system can be described by the model.It herein can be with
By model the control signal for high-pressure pump 8 is generated by means of input signal 5,6,7.Such as parameter introduces height into model
The behavior and the leakage in system of press pump 8.In addition, parameter introduces the behavior of fuel into model, such as the viscosity of fuel, because
Leakage in viscosity such as influence system and therefore influence rail pressure.
Generated control signal is exported by interface 9 and first passes around processing unit from there through signal path 10
It 11 and eventually passes through another signal path 12 and is supplied to high-pressure pump 8.By controlling signal, high-pressure pump 8 is so controlled so that from
Certain fuel quantity is transported in deposit in the fuel accumulator not shown in Fig. 1 of common rail system so that in fuel accumulator
The middle specified rail pressure generated corresponding to input signal 5,6,7.
Desirable specified rail pressure whether is actually set in fuel accumulator in order to detect, by Fig. 1
In the rail pressure sensor that does not show obtain the rail pressure of the physical presence in fuel accumulator.With the track obtained
The corresponding sensor signal of pressure is supplied to comparator 14 by signal path 13, and obtained rail is obtained by the comparator
The deviation is equally supplied to comparator 14 by the deviation of road pressure and specified rail pressure.When input signal 5,6, one of 7 includes
When specified rail pressure, can this input signal 7 be directly supplied to comparator via signal path 15 as shown in FIG. 1
14.But also it is possible that obtaining specified rail pressure in control unit 4 first, wherein what is obtained in the case is specified
Rail pressure can be supplied to comparator 14 from control unit 4.
The deviation of the actual track pressure and specified rail pressure that are obtained by comparing device 14 is supplied by signal path 16
Processing unit 17 should be arrived.In processing unit 17 viscosity correction value is obtained from deviation.It is adopted with the model in control unit 4
Different viscositys then cause, for example, occur in common rail system different leakage rates and thus set with according to model meter
The different rail pressures calculated.Then it can be conveyed on the contrary from the deviation of rail pressure and specified rail pressure to learn
The extent of deviation of the practical viscosity of fuel and the viscosity used in a model.
This viscosity correction value is transmitted to control unit 4 by signal path 18.There, it will in a model consider
Parameter for viscosity is correspondingly adapted to viscosity correction value.That is, in order to further run common rail system, then
By it is changing in a model, for generating control signal based on the value of the viscosity of fuel.It accordingly produces for height
The control signal of press pump 8 being corrected, high-pressure pump 8 is controlled by the control signal so that into fuel accumulator, conveying exists
Wherein realize the fuel quantity of desired specified rail pressure.
In the embodiment shown in fig. 1, processing unit 17 serves additionally as adjuster 19, can be according to by the adjuster
The deviation of rail pressure and rated pressure measured by Lai Yu generates Regulate signal, and then the Regulate signal is via signal path
20 are supplied to processing unit 11.Specifically, Regulate signal can be believed in processing unit 11 with the control generated by control unit 4
Number be added, so as to correct rail pressure in short time.Adjuster 19 is herein may be designed so that so that only in control unit 4
It is middle to generate Regulate signal by the model adaptation viscosity correction value and before the control signal being corrected be generated and supplied
Processing unit 11 should be arrived.It can alternatively propose, adjuster 20 is directed to the short-term fluctuation of equilibrium orbit pressure to generate warp
Modified Regulate signal, and only when there is the systematic bias of rail pressure and specified rail pressure just to examining in a model
The parameter for viscosity considered is adapted to.It can especially propose thus, measured rail pressure is in a longer period of time
Deviate substantially the same value with specified rail pressure.Can accordingly propose, processing unit 17 only rail pressure than
Just acquisition viscosity correction value or by viscosity when being more than or less than specified rail pressure on the longer period of minimum time section
Correction value is supplied to control unit 4.On the contrary, in the presence of deviation is less than minimum time section, pass through adjuster
19 generate the Regulate signal for correcting rail pressure in short term and Regulate signal are also supplied to height in addition to control signals
Press pump 8.
The present invention is not limited to preferred embodiment given above in terms of embodiments thereof.But, it can be envisaged that permitted
Changeable body, even if in principle in different types of embodiment, these variants can also use shown solution.From
All features and/or advantages including structure detail or arrangement space obtained in claims, instructions, or drawings can be certainly
For body and can be necessary to the present invention in different combinations.
List of numerals
1 interface
2 interfaces
3 interfaces
4 control units
5 input signals
6 input signals
7 input signals
8 high-pressure pumps
9 interfaces
10 signal paths
11 processing units
12 signal paths
13 signal paths
14 comparators
15 signal paths
16 signal paths
17 processing units
18 signal paths
19 adjusters
20 signal paths
Claims (10)
1. a kind of method for running the common rail system of combustion engine, this approach includes the following steps：
Input signal (5,6,7) is supplied to the control unit (4) of the common rail system,
Based on the model stored in the control unit (4) and based on the input signal (5,6,7) by means of the control unit
(4) the control signal of the high-pressure pump (8) for the common rail system is obtained,
The control signal is supplied to the high-pressure pump (8) so that the high-pressure pump (8) is controlled as, in the fuel of the common rail system
The specified rail pressure corresponding to the input signal (5,6,7) is generated in reservoir,
The rail pressure actually generated in the fuel accumulator is obtained with rail pressure sensor,
Viscosity correction value is obtained from the deviation of the practical rail pressure generated and the specified rail pressure,
The viscosity correction value is supplied to the control unit (4) for the high-pressure pump (8),
The parameter of viscosity considering in the model, for the fuel is adapted to corresponding to the viscosity correction value, and
In view of the viscosity correction value, it is used for by means of the model stored in the control unit (4)
The control signal of the high-pressure pump (8) being corrected.
2. according to the method described in claim 1,
It is characterized in that,
In view of the viscosity correction value, other than the control signal being corrected for being used for the high-pressure pump (8),
The duration and/or fuel injection that start time point, fuel for controlling fuel injection inject also are generated by the model
End time point the control signal being corrected.
3. method according to claim 1 or 2, wherein
It is characterized in that,
It is only inclined from the specified rail pressure to a direction on scheduled minimum time section when the rail pressure obtained
When shifting, the viscosity correction value is just supplied to the control unit (4).
4. according to the method described in one of above claim,
It is characterized in that,
It is produced dependent on the deviation of obtained rail pressure and specified rail pressure by the adjuster (19) of the common rail system
The Regulate signal particularly for correcting the deviation in short term is given birth to, and
The Regulate signal is also supplied to the high-pressure pump (8) other than the control signal.
5. according to the method described in one of above claim,
It is characterized in that,
The control unit (4) generates the control signal for lubricant system dependent on obtained viscosity correction value, so as to
Additional lubricant is supplied to the common rail system.
6. according to the method described in one of above claim,
It is characterized in that,
The input signal includes the information about engine speed, specified injected slurry volume and/or specified rail pressure.
7. a kind of common rail system for combustion engine, the common rail system is more particularly to according to described in one of claim 1 to 6
Method run, wherein the common rail system has：
Control unit (4), the control unit have interface (1,2,3) for receiving input signal (5,6,7) and for exporting
The interface (9) of signal is controlled, the wherein control unit (4) is configured as generating based on model and the input signal (5,6,7)
Control signal and the high-pressure pump (8) that the control signal is supplied to the common rail system,
The high-pressure pump (8), the high-pressure pump can deliver fuel into the fuel accumulator of the common rail system so that pass through control
The control of unit (4) processed is generated in the fuel accumulator and the corresponding specified rail pressure of input signal (5,6,7),
Rail pressure sensor can obtain the practical rail acted in the fuel accumulator by the rail pressure sensor
Road pressure, and
Processing unit (17), can be from the inclined of the actual track pressure obtained and specified rail pressure by the processing unit
Difference obtains viscosity correction value and the viscosity correction value is supplied to the control unit (4), considers in the model to be adapted to
The parameter of viscosity arriving, for fuel.
8. common rail system according to claim 7,
It is characterized in that,
The control unit (4) is configured as, based on the model and in view of the viscosity correction value, in addition to being used for
Except the control signal being corrected of the high-pressure pump (8), start time point, the fuel note for controlling fuel injection are also generated
The control signal of the end time point of the duration entered and/or fuel injection being corrected.
9. common rail system according to claim 7 or 8,
It is characterized in that,
It is provided with adjuster (19), which is configured as, dependent on the rail pressure obtained and specified rail pressure
Deviation generates Regulate signal particularly for correcting the deviation in short term and the high-pressure pump (8) has for receiving adjusting letter
Number interface.
10. the common rail system according to one of claim 7 to 9,
It is characterized in that,
The control unit (4) is configured as, and the control for lubricant system is generated dependent on the viscosity correction value obtained
Signal, so that additional lubricant is supplied to the common rail system.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102017105473.1A DE102017105473A1 (en) | 2017-03-15 | 2017-03-15 | COMMON RAIL SYSTEM AND METHOD FOR OPERATING A COMMON RAIL SYSTEM |
| DE102017105473.1 | 2017-03-15 |
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| Publication Number | Publication Date |
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| CN108626014A true CN108626014A (en) | 2018-10-09 |
| CN108626014B CN108626014B (en) | 2022-08-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810208429.8A Active CN108626014B (en) | 2017-03-15 | 2018-03-14 | Common rail system and method for operating a common rail system |
Country Status (2)
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| CN (1) | CN108626014B (en) |
| DE (2) | DE102017105473A1 (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| DE102018105468A1 (en) | 2018-09-20 |
| CN108626014B (en) | 2022-08-12 |
| DE102017105473A1 (en) | 2017-04-27 |
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