CN101231225B - System and method for determining ethanol content in fuel - Google Patents
System and method for determining ethanol content in fuel Download PDFInfo
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- CN101231225B CN101231225B CN 200710169764 CN200710169764A CN101231225B CN 101231225 B CN101231225 B CN 101231225B CN 200710169764 CN200710169764 CN 200710169764 CN 200710169764 A CN200710169764 A CN 200710169764A CN 101231225 B CN101231225 B CN 101231225B
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Abstract
A system and method are provided for determining an ethanol content of a fuel that is part of a fuel and air mixture combusted within an internal combustion engine. A pressure characteristic of a fuel rail is monitored during operation of the engine. At least one of an effective bulk modulus of the fuel and a pressure perturbation signature is determined based on the pressure characteristic. The ethanol content is determined based on the at least one of the effective bulk modulus and the pressure perturbation signature.
Description
Cross reference to related application
It is the rights and interests of No. the 60/837th, 033, the U.S. Provisional Application on August 11st, 2006 that the application requires the applying date.The open of above-mentioned application is incorporated into this by reference.
The field
The disclosure relates to engine system, and relates more specifically to be used for confirming the system and method for ethanol content in fuel.
Background
The statement of this part only provides the background technical information relevant with the disclosure and possibly not constitute prior art.
Explosive motor produces driving torque through the potpourri of air in the combustion cylinders and fuel.More specifically, air is inhaled in the engine and is assigned in the cylinder.Air and fuel mix, thus ignition mixture formed, it has needed air/fuel ratio, and this potpourri burns in cylinder combustion.Combustion process reciprocally drives the piston in the cylinder, and piston rotation ground drives bent axle, so that driving torque is provided.
Recently, alternative fuel is developed such as the fuel based on alcohol, for use in engine system.Fuel based on alcohol comprises such as methyl alcohol and ethanol.Modern engine system can be used gasoline, mix arbitrarily and move based on the fuel of alcohol or its.Yet when under different fuel situation, moving, the operation of engine must be modified, because the cause of the different qualities of every kind of fuel.Such as, because the cause of different chemical composition, use the potpourri of ethanol or ethanol and gasoline, the operation such as the engine of E85 (that is, the potpourri of 85% ethanol and 15% gasoline) requires ethanol with respect to the quantity increase of gasoline on stoichiometry.
Some engine systems comprise uses the ethanol content of fuel sensor directly to measure.The execution of this fuel sensor has increased the complicacy of integrated cost and engine system.
Other engine system comprises the indirect measurement to ethanol content.More specifically, use the air/fuel ratio calculation to confirm the content of ethanol/Fuel Petroleum.This compares Mass Air Flow (MAF) and predetermined injected fuel quantity and obtain, thereby air/fuel ratio is provided through under stoichiometric conditions of discharge.Use air/fuel ratio to confirm that fuel content has good precision, thereby know air/fuel ratio with stoichiometric ethanol, and the air/fuel ratio of gasoline requirement was near 14.5: 1 near 9: 1.
Though virtual (virtual) sensor of current techniques development level can provide the accurate measurement to fuel content, it is consuming time and be easy to mistake and read, because the cause of the influence of a plurality of incoherent engine operational conditions.
Summary
Therefore, the disclosure provides a kind of system and method that is used for the ethanol content of definite fuel, and this ethanol is the part of fuel and AIR MIXTURES, and this potpourri is in the explosive motor internal combustion.The pressure characteristic of fuel rail is kept watch in the operational process of engine.In the effective bulk modulus of fuel (bulk modulus) at least one and pressure disturbance signal are determined based on pressure characteristic.Ethanol content is based at least one and pressure disturbance signal in the effective bulk modulus and be determined.
In another characteristic, pressure characteristic comprises at least one in following group, and this group comprises that the pressure that is caused by injection event reduces and increased by the pressure that pumping activities causes.
In another characteristic, the pressure disturbance signal comprises the mean value corresponding to the pressure amplitude on a plurality of injection/pumping activities.
In another characteristic, ethanol content calculates based on pressure characteristic.
In another characteristic, ethanol content is confirmed from question blank based on the pressure disturbance signal.
In another characteristic, ethanol content further based in the bulk modulus of the bulk modulus of the volume of the fuel of the volume of the volume of fuel rail, institute's injected fuel, institute's pumping, gasoline and ethanol at least one and be determined.The bulk modulus of the volume of fuel rail, the bulk modulus of gasoline and ethanol is as the constant of pre-stored and provide.
The disclosure provides a kind of improved virtual fuel content sensor; It has improved existing inducing method through the specific measurement of the fuel system that quick response is provided; Reduce the stability (robustness) of (that is, less computation requirement) and improvement to obtain extra logic.
The description that from literary composition, is provided, further application will become clear.Be to be understood that: describe and certain embodiments only is used to the purpose explained, and be not limited to the scope of the present disclosure.
Accompanying drawing
Accompanying drawing described in the literary composition only is used to the purpose explained, and never is used for limiting by any way the scope of the present disclosure.
Fig. 1 is the functional-block diagram of exemplary engine system;
Fig. 2 is a figure, has explained according to ethanol content of the present disclosure and has confirmed the exemplary operational factor track that control is used;
Fig. 3 is a process flow diagram, has explained by ethanol content of the present disclosure and has confirmed the illustrative steps that control is performed; And
Fig. 4 is the functional-block diagram of example modules, and this module is carried out ethanol content of the present disclosure and confirmed control.
Describe in detail
Being described in below the preferred embodiment only is exemplary in essence, and never is used to limit the present invention, application of the present invention or use.For the purpose of clear, will use identical label to indicate similar elements in the accompanying drawing.As employed in the text; Term module refers to special IC, electronic circuit, processor (shared, special-purpose or in groups) and storer, other suitable member that it is carried out one or more softwares or firmware program, combinational logic circuit or said function is provided.
With reference now to Fig. 1,, it has showed exemplary engine system 10.Exemplary engine system 10 comprises the engine 12 with inlet manifold 14 and exhaust manifold 16.Engine system 10 further comprises the fuel injector system 18 of have fuel rail (fuel rail) 20 and a plurality of fuel injectors 22 that are associated with cylinder 24 accordingly.Air is inhaled in the inlet manifold 14 through air throttle 26, and is assigned in the cylinder 24.Air with by corresponding fuel injector 22 and injected fuel is mixed, thereby in cylinder 24, form ignition mixture.Ignition mixture has needed air/fuel ratio, and burns in cylinder combustion, thus driven plunger (figure does not show) reciprocally, and piston drives bent axle 28 again.Waste gas is discharged from engine 12 via exhaust manifold 16.
Fuel system 30 provides fuel for spraying system 18.More specifically, fuel system 30 comprises fuel tank 32 and petrolift 34.Petrolift 34 can be constant displacment pump or variable displacement pump, and is the fuel after fuel rail 20 provides compression.When fuel injector 22 injected fuel in the corresponding cylinder 24, the fuel supplement after petrolift 34 will compress was in fuel rail 20.
Control module 40 is confirmed control and is regulated the operation of engine system 10 based on ethanol content of the present disclosure.More specifically, the fuel pressure in the pressure transducer 42 supervision fuel rail 20.Control module 40 is confirmed the ethanol content of fuel based on pressure characteristic, like following further description.After confirming ethanol content, control module 40 can suitably be regulated air/fuel ratio and other burning controlled variable based on ethanol content.
The disclosure is used predetermined direct injection fuel system content and is confirmed the ethanol content in the fuel.This content comprises volume, and the fuel rail pressure sensor of known fuel rail, and the fuel rail pressure sensor provides as fast response transducer.This content can be used for based on pressure characteristic and confirms the ethanol content in the fuel.Fig. 2 provides figure, has showed exemplary operational factor track, comprises fuel rail pressure and injection event.
Preferably,, engine and/or fuel rail pressure confirm ethanol content when being in steady state (SS).More specifically, steady state (SS) is the operational mode of engine, and average fuel pressure is almost constant in this pattern.Yet if use the algorithm based on activity, engine and/or fuel rail pressure need not be in steady state (SS) so, and wherein effectively bulk modulus calculating is used for any specific pumping activities or injection event.Yet, consider for a long time or the pressure signal characteristic (that is, from the peak value to the peak value) more simplified possibly more correspond to reality.In the execution of this simplification, will only be mapped in the size of steady state (SS) benchmark the correlativity of ethanol content.
In a characteristic, ethanol content is confirmed in the definite control of ethanol content based on injection event.More specifically, the fuel of predetermined directly is ejected in the cylinder from the fuel rail with known volume.As the result of injection event, hydraulic energy exhausts from fuel rail, and in fuel rail, energy is with the stored in form of accumulator.This energy exhausts from fuel rail with the form of the volume that is sprayed with pressure, thereby has caused the lower fuel rail pressure after the injection event.
It is relevant with the fuel rail volume of being scheduled to (that is storage capacity) with the bulk modulus (that is the elasticity of fluid) of fluid that pressure in the fuel rail reduces.Because less than the cause of the bulk modulus of gasoline, the pressure in the caused fuel rail reduces the pressure that causes separately less than gasoline is reduced significantly for the bulk modulus of ethanol.When the pressure in the caused fuel rail by injection event reduced, fuel pressure sensor can be used for the gaging pressure characteristic.
Ethanol content is based on injection event and use the following relationship formula and be determined:
Wherein: V
RAILKnown volume for fuel rail;
Δ P
INJFor the pressure as the injection event result reduces;
V
INJVolume for institute's injected fuel;
BM
EFFINJEffective bulk modulus for injection event;
BM
GASKnown volume modulus for gasoline;
BM
ETHKnown volume modulus for ethanol; And
E
RATIOBe the ethanol ratio that provides with number percent.
V
INJCan be according to the following relationship formula and the Be Controlled module calculates as the open loop control item that is used for fuel injector or is used for steady-state condition:
Wherein: V
PUMPFor being used for the known pump discharge capacity of injection event; And
3/
4Be exemplary conversion, shown four injections of three pumping activities are lived
Moving.
3/
4Can between engine system, change according to the configuration of the configuration of engine and petrolift.V
PUMPCan be used as fixing volume and provide, such as when petrolift is the situation of constant displacment pump, or can be calculated as the open loop control item by control module, it provided before injection event, such as when pump is the situation of variable displacement pump.
In another characteristic, ethanol content is confirmed based on pumping activities.More specifically, each pumping activities is reduced to the fuel pressure of predetermined quantity in the fuel rail, thereby causes that pressure increases, and it is directly proportional with the bulk modulus and the known pressure rail volume of fuel again.Ethanol content uses the following relationship formula based on pumping activities and confirms:
Wherein: Δ P
PUMPFor the pressure as the pumping activities result increases; And
BM
EFFPUMPEffective bulk modulus for pumping activities.
In another characteristic, a plurality of injection event and pumping activities overlap usually in time, thereby produce pressure disturbance (pressure perturbation) signal.The amplitude of disturbing signal is directly proportional with the bulk modulus of fuel again.Therefore, the effective bulk modulus of the bulk modulus of fuel and ethanol/gasoline content can be assessed through the gaging pressure perturbation amplitude in this signal.This measures then and can compare with the question blank of being scheduled to and storing in advance in the control module, and with the function of desired amplitude as volume that is sprayed and/or engine speed, thereby the ethanol content of definite fuel.Such as, the average minimum radius and the amplitude peak of a plurality of burning activities can be determined, and compare with numerical value in the question blank, thereby ethanol content is provided.
With reference now to Fig. 3,, confirms that by ethanol content the performed illustrative steps of control will be described in detail.In step 300, control confirms whether engine moves.If engine is operation not, then control circulation backward.If engine moves, then be controlled at and confirm in the step 302 whether engine runs on steady state (SS).If engine does not run on steady state (SS), then control loops back to step 300.If engine runs on steady state (SS), then be controlled in the step 304 and proceed.
In step 304, the pressure characteristic of fuel system is kept watch in control.Pressure characteristic can comprise that the pressure that the pressure that is caused by injection event reduces, caused by pumping activities increases, and/or includes but not limited to pressure disturbance signal minimum and the amplitude peak value.Be controlled in the step 306 and confirm the ethanol content in the fuel based on pressure characteristic.More specifically, ethanol content can increase or reduces and/or use question blank directly to calculate based on the pressure disturbance signal based on pressure.In step 308, control system is regulated the operation of engine based on ethanol content.Adjust the calculating in air/fuel ratio, electronic spark advance and valve correct time based on ethanol content such as, control system.
With reference now to Fig. 4,, confirms that by ethanol content the example modules that control system is carried out will be described in detail.Exemplarily module is included in first module 400 of keeping watch on the pressure characteristic of fuel rail in the operational process of engine, and confirms the effective bulk modulus of fuel and at least one second module 402 in the pressure disturbance signal based on pressure characteristic.Three module 404 based on the effective bulk modulus of fuel and in the pressure disturbance signal at least one and confirm the ethanol content in the fuel, as above said in detail.Four module 406 is regulated the operation of engine based on ethanol content.
Those those of ordinary skill in the art can understand from the description of front now: wide in range instruction of the present invention can be carried out in a variety of forms.Though therefore the present invention has combined its certain embodiments and has been described; True scope of the present invention should not receive restriction like this; Because according to the research to accompanying drawing, instructions and equivalent structures, other modification will be obvious to the practitioner with certain technology.
Claims (15)
1. the method for a definite ethanol content in fuel, said ethanol is the part of fuel and AIR MIXTURES, and said potpourri is in the explosive motor internal combustion, and said method comprises:
In the operational process of said engine, keep watch on the pressure characteristic of fuel rail; Said pressure characteristic reduces for the pressure that is caused by injection event or is increased by the pressure that pumping activities causes;
Confirm effective bulk modulus, the effective bulk modulus of pumping activities and at least one in the pressure disturbance signal of said injection event based on said pressure characteristic; And
Based on the effective bulk modulus of the effective bulk modulus of said injection event, said pumping activities and in the said pressure disturbance signal at least one and confirm the content of said ethanol.
2. the method for claim 1 is characterized in that, said pressure disturbance signal is the mean value corresponding to the pressure amplitude in a plurality of burning activities.
3. the method for claim 1 is characterized in that, said ethanol content is confirmed from pressure disturbance amplitude question blank based on said pressure disturbance signal.
4. the method for claim 1 is characterized in that, said ethanol content further is determined based on volume, the bulk modulus of gasoline and the bulk modulus of ethanol of the fuel of the volume of the volume of fuel rail, institute's injected fuel, institute's pumping.
5. method as claimed in claim 4 is characterized in that, the bulk modulus of the volume of said fuel rail, the bulk modulus of said gasoline and said ethanol is as the constant of pre-stored and provide.
6. system that is used for confirming the ethanol content of fuel, said ethanol is the part of fuel and AIR MIXTURES, and said potpourri is in the explosive motor internal combustion, and said system comprises:
First module, it keeps watch on the pressure characteristic of fuel rail in the operational process of said engine, and said pressure characteristic reduces for the pressure that is caused by injection event or is increased by the pressure that pumping activities causes;
Second module, it confirms effective bulk modulus, the effective bulk modulus of pumping activities and at least one in the pressure disturbance signal of said injection event based on said pressure characteristic; And
Three module, at least one in the effective bulk modulus of its effective bulk modulus, pumping activities and the said pressure disturbance signal and confirm said ethanol content based on said injection event.
7. system as claimed in claim 6 is characterized in that, said pressure disturbance signal is the mean value corresponding to the pressure amplitude in a plurality of burning activities.
8. system as claimed in claim 6 is characterized in that, said ethanol content is confirmed from pressure disturbance amplitude question blank based on said pressure disturbance signal.
9. system as claimed in claim 6 is characterized in that, said ethanol content is further based on the bulk modulus of the bulk modulus of the volume of the fuel of the volume of the volume of fuel rail, institute's injected fuel, institute's pumping, gasoline and ethanol and be determined.
10. system as claimed in claim 9 is characterized in that, the bulk modulus of the volume of said fuel rail, the bulk modulus of said gasoline and said ethanol is as the constant of pre-stored and provide.
11. a method of regulating the engine operation based on the ethanol content of confirming fuel, said ethanol is the part of fuel and air mixture, and said potpourri is in the explosive motor internal combustion, and said method comprises:
In the operational process of said engine, keep watch on the pressure characteristic of fuel rail, said pressure characteristic reduces for the pressure that is caused by injection event or is increased by the pressure that pumping activities causes;
Assess said engine and whether run on steady-state mode;
When said engine runs on said steady-state mode, confirm effective bulk modulus, the effective bulk modulus of pumping activities and at least one in the pressure disturbance signal of said injection event based on said pressure characteristic;
Based on the effective bulk modulus of the effective bulk modulus of said injection event, pumping activities and in the said pressure disturbance signal at least one and confirm the content of said ethanol; And
Regulate the operation of said engine based on said ethanol content.
12. method as claimed in claim 11 is characterized in that, said pressure disturbance signal is the mean value corresponding to the pressure amplitude in a plurality of burning activities.
13. method as claimed in claim 11 is characterized in that, said ethanol content is confirmed from pressure disturbance amplitude question blank based on said pressure disturbance signal.
14. method as claimed in claim 11 is characterized in that, said ethanol content further is determined based on volume, the bulk modulus of gasoline and the bulk modulus of ethanol of the fuel of the volume of the volume of fuel rail, institute's injected fuel, institute's pumping.
15. method as claimed in claim 14 is characterized in that, the bulk modulus of the volume of said fuel rail, the bulk modulus of said gasoline and said ethanol provides as the constant of pre-stored.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US11/626,545 US7523723B2 (en) | 2006-08-11 | 2007-01-24 | System and method for determining ethanol content in fuel |
| US11/626545 | 2007-01-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101231225A CN101231225A (en) | 2008-07-30 |
| CN101231225B true CN101231225B (en) | 2012-04-04 |
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| CN 200710169764 Expired - Fee Related CN101231225B (en) | 2007-01-24 | 2007-11-16 | System and method for determining ethanol content in fuel |
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| SE537360C2 (en) * | 2011-12-28 | 2015-04-14 | Scania Cv Ab | Arrangement and method for estimating a fuel mixture content of an auxiliary fuel |
| US9587578B2 (en) | 2013-12-06 | 2017-03-07 | Ford Global Technologies, Llc | Adaptive learning of duty cycle for a high pressure fuel pump |
| US9243598B2 (en) | 2014-02-25 | 2016-01-26 | Ford Global Technologies, Llc | Methods for determining fuel bulk modulus in a high-pressure pump |
| US9458806B2 (en) | 2014-02-25 | 2016-10-04 | Ford Global Technologies, Llc | Methods for correcting spill valve timing error of a high pressure pump |
| US9874185B2 (en) | 2014-05-21 | 2018-01-23 | Ford Global Technologies, Llc | Direct injection pump control for low fuel pumping volumes |
| DE102016225435B3 (en) * | 2016-12-19 | 2018-02-15 | Continental Automotive Gmbh | Method for operating an internal combustion engine with fuel detection |
| US10801428B2 (en) | 2019-02-20 | 2020-10-13 | Ford Global Technologies, Llc | Fuel composition and aging estimation |
| US10801462B2 (en) | 2019-02-20 | 2020-10-13 | Ford Global Technologies, Llc | Fuel composition and aging estimation |
| US11181089B2 (en) | 2019-02-20 | 2021-11-23 | Ford Global Technologies, Llc | Fuel composition and aging estimation |
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| US6975933B2 (en) * | 2003-02-13 | 2005-12-13 | Nissan Motor Co., Ltd. | Fuel properties estimation for internal combustion engine |
| CN1583975A (en) * | 2004-06-11 | 2005-02-23 | 黑龙江建业燃料有限责任公司 | Clean alcohol fuel for vehicle |
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| CN101231225A (en) | 2008-07-30 |
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