• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A method for determining the Ethanol content of the fuel in a motor vehicle uses the dependence of the lean-running limit of the internal combustion engine on the ethanol content of the fuel to determine the ethanol content, by the fact that the ethanol content is arrived at from the required reduction in the injected fuel quantity to reach the lean-running limit.
    公开号:SE534646C2
    申请号:SE0900480
    申请日:2007-05-31
    公开日:2011-11-01
    发明作者:Gerard Haft；Wolfgang Moser
    申请人:Continental Automotive Gmbh；
    IPC主号:
    专利说明:

    534 646 2 variance coefficient for this cylinder is monitored during this process and the limit for lean driving is judged to have been reached if the variance coefficient exceeds a predetermined threshold value. From the reduction of the amount of fuel required to reach the limit for lean running, the conclusion is then drawn - preferably with the help of an engine map - regarding the ethanol content of the fuel.
    The process of the present invention is used in particular to validate the ethanol content obtained by another process (in particular the A process).
    Additional features and advantages of the method of the invention are described with reference to the accompanying drawings. The figures are as follows: Fig.1 A diagram in which the variance coefficient COV is plotted against the excess air factor Å and Fig. 2 Two diagrams of which in the upper diagram a factor K for the amount of fuel to be injected has been plotted against time t and in the lower diagram the variance coefficient COV has been set aside against time t.
    As previously mentioned, the present invention that the combustion engine's capacity for lean running is improved by an increase in the ethanol content of the fuel. This relationship is shown in the diagram in Fig. 1, in which the coefficient of variance (CO /) has been plotted against the excess air factor Å for different fuels. The dimensionless coefficient of variance COV characterizes the smooth running of an internal combustion engine. This means that the uneven curvature increases in magnitude when the coefficient of variance COV increases. A predetermined threshold value (for example COV = 5) is usually set as the limit for lean driving, above which it is not possible to achieve an acceptable smooth running.
    Curves ROZ95 and ROZ100 shown in the diagram in Fig. 1 apply to a petrol with an octane number of 95, while curves E5, E50, E85 and E100 apply to a fuel with an ethanol content of 5%, 50%, 85% or 100%.
    As can be observed from the diagram in Fig. 1, the limit for lean cooking (COV = 5) changes when the ethanol content of the fuel increases in the direction of a higher air excess factor Å, i.e. in the lean direction. Consequently, the lean mileage limit for the ROZ 95 gasoline is at an A value of about 1.25, while the lean mileage limit for pure ethanol (E100) is at an A value of about 1.42.
    Based on the diagram shown in Fig. 2, the method according to the present invention will hereby be explained in an internal combustion engine (not shown): uses a connection with a four-cylinder If the internal combustion engine is operated at a constant load point, e.g. idle, the amount of fuel injected into a first cylinder is first reduced step by step. This is shown in the upper diagram in Fig. 2 with a factor K for the amount of fuel to be injected. First 534 646 3 the factor K1 for the first cylinder is reduced to 0.9 and then further gradually. At the same time, the amount of fuel to be injected into the other cylinders is increased by a corresponding amount, in such a way that the total ratio of fuel to air in all cylinders is maintained at Å = 1. This is indicated in the upper diagram in Fig. 2 with the curves named K2, K3 and K4.
    At the same time as the described change in the amount of fuel injected takes place, the uneven running of the internal combustion engine is monitored with respect to individual cylinders. Since the monitoring of smooth running is known according to prior art (cf. eg DE 41 22 139 and DE 197 41 965), it is not discussed in more detail here. As shown in the lower diagram in Fig. 2, the value of smooth COV1 for the first cylinder gradually increases, while the amount of fuel injected decreases and consequently the air-fuel mixture becomes leaner, as can be observed by the COV1 curve in the lower diagram in Fig. 2. Fig. 2.
    In the exemplary embodiment shown, the COV value, which represents the limit M for lean queues, is assumed to be 5. If the value for smooth running COV1 for the first cylinder has now reached the limit M for lean queues (COV = 5), the factor KM, for example, which corresponds to the limit M for lean driving, to 0.7 for the first cylinder.
    This factor KM, which corresponds to the reduction of the amount of fuel injected into the first cylinder upon reaching the limit of lean running, now enables a determination of the ethanol content of the fuel.
    The ethanol content is suitably read from an engine map (not shown) in which the ethanol content is plotted against the factor KM. For practical reasons, it may also be appropriate to deposit the ethanol content against AM in the engine map, where AM = 1 / KM. In the exemplary embodiment described, for example, AM = 1 / 0.7 = 1.428.
    If the value for smooth running COV1 has reached the limit M for lean running for the first cylinder, the reduction of the amount of fuel to be injected for the first cylinder is completed. The described procedure for reducing the amount of fuel to be injected into the remaining cylinders is then performed, as indicated in the two diagrams in Fig. 2.
    The ethanol content of the fuel is then determined from a statistical evaluation of the results for all cylinders and by means of a number of rounds of the process described.
    As already mentioned at the beginning, the ethanol content of the fuel determined in this way is used to validate an A-process belonging to the prior art. A significant advantage of the method of the present invention is based on the fact that it does not depend on a measurement of the A-value. This validation makes it possible to determine at any time whether a change in the A value is due to a change in the ethanol content or a fault in the fuel system.
    With the help of the validated values from the Å procedure, the engine control system can perform the generally accepted A adaptation procedure and diagnosis of the fuel system (FSD).
    权利要求:
    Claims (6)
    [1]
    Method for determining the ethanol content of the fuel of a motor vehicle, characterized in that it uses the limit (M) for lean operation of the internal combustion engine in the motor vehicle depends on the ethanol content of the fuel, comprising gradually reducing the amount of fuel injected into a cylinder in the internal combustion engine in determining said limit (M), the coefficient of variance (COV) of this cylinder in the internal combustion engine being monitored during this process and the limit (M) is judged to have been reached if the coefficient of variance (COV) exceeds a predetermined threshold value; and determining the ethane content of the fuel from the reduction (KM) of injected fuel required to reach the limit (M) for lean engine operation.
    [2]
    Method according to claim 1, characterized in that, during the reduction of the amount of fuel injected into a cylinder, the amount of fuel injected into the remaining cylinders is gradually increased, so that the excess air factor Å is maintained at a constant value.
    [3]
    Method according to claim 1 or 2, characterized in that the ethanol content of the fuel is obtained from an engine map, wherein the ethanol content is plotted against the reduction (KM) of injected fuel required to reach the limit (M) for lean engine operation.
    [4]
    Process according to Claim 3, characterized in that the ethanol content in the engine map is plotted as a function of the speed and load of the internal combustion engine.
    [5]
    Method according to one of the preceding claims, characterized in that the limit (M) for lean running of the engine is determined for a running of the internal combustion engine at a fixed load point.
    [6]
    Process according to one of the preceding claims, characterized in that the ethanol content of the fuel is used for validation of the ethanol content obtained by means of another process.
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    同族专利:
    公开号 | 公开日
    DE102006043341B4|2008-06-26|
    US8113174B2|2012-02-14|
    DE102006043341A1|2008-03-27|
    SE0900480L|2009-04-09|
    WO2008031641A1|2008-03-20|
    US20090308350A1|2009-12-17|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US4059411A|1966-12-20|1977-11-22|Smith Marvin M|Method for extending the lower lean limit of running of internal combustion engines and improving the combustion of fluid fuels|
    DE4122139C2|1991-07-04|2000-07-06|Bosch Gmbh Robert|Method for cylinder equalization with regard to the fuel injection quantities in an internal combustion engine|
    DE19580520C2|1994-03-31|2003-08-14|Mitsubishi Motors Corp|Method for determining an uneven road in a vehicle equipped with an internal combustion engine|
    DE19741965C1|1997-09-23|1999-01-21|Siemens Ag|Multi-cylinder fuel injected IC engine running smoothness control method|
    US5901671A|1997-10-29|1999-05-11|Daimlerchrysler Corporation|Method of determining the composition of fuel in a flexible fueled vehicle after fuel blending|
    US5950599A|1997-10-29|1999-09-14|Chrysler Corporation|Method of determining the composition of fuel in a flexible fueled vehicle without an O2 sensor|
    US6206940B1|1999-02-12|2001-03-27|Exxon Research And Engineering Company|Fuel formulations to extend the lean limit |
    US6298838B1|2000-04-19|2001-10-09|Daimlerchrysler Corporation|Ethanol content learning based on engine roughness|
    US6566892B2|2000-06-19|2003-05-20|Siemens Vdo Automotive Corporation|Portable fuel analyzer for analyzing the alcohol content of a mixed fuel|
    US7523723B2|2006-08-11|2009-04-28|Gm Global Technology Operations, Inc.|System and method for determining ethanol content in fuel|
    DE102007019992A1|2007-04-27|2008-10-30|Robert Bosch Gmbh|Fuel analysis performing method for internal-combustion engine of e.g. flexible fuel vehicle, involves determining petrol content in fuel by using sensor or software algorithm, and additionally determining water content in fuel|
    US7623955B1|2008-04-30|2009-11-24|Delphi Technologies, Inc.|Method for estimation of indicated mean effective pressure for individual cylinders from crankshaft acceleration|DE102008005883B4|2008-01-24|2009-09-17|Continental Automotive Gmbh|Method and device for operating an internal combustion engine|
    DE102008046719B3|2008-09-11|2010-03-04|Continental Automotive Gmbh|Method and device for determining the ethanol content of the fuel in a motor vehicle|
    DE102009058677B4|2009-12-16|2021-09-02|Vitesco Technologies GmbH|Method for determining a fuel quality value|
    US8046153B2|2010-07-20|2011-10-25|Ford Global Technologies, Llc|Compensation for oxygenated fuels in a diesel engine|
    KR101855752B1|2012-10-31|2018-06-25|현대자동차 주식회사|Gasolin engine control system and control mehtod for the same|
    WO2016137343A1|2015-02-23|2016-09-01|Alsemix Sp. Z O.O.|Method for determination of ethanol content in fuel for internal combustion engines|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE102006043341A|DE102006043341B4|2006-09-15|2006-09-15|Method for determining the ethanol content of the fuel in a motor vehicle|
    PCT/EP2007/055322|WO2008031641A1|2006-09-15|2007-05-31|Method for determining the ethanol content of the fuel in a motor vehicle|
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