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CN-116867960-B - Fuel dispensing method

CN116867960BCN 116867960 BCN116867960 BCN 116867960BCN-116867960-B

Abstract

Method for determining characteristics of fuel to be applied to a nozzle of an internal combustion engine comprising a fuel tank, at least one nozzle and a characteristic measuring sensor inserted in a conduit connecting the fuel tank and the at least one nozzle, characterized in that-by means of the measuring sensor data of characteristics of the fuel are collected over a first period of time, an average value of the collected data is determined and stored in a matrix, which is associated to a volume counter having a given initial value, -for each subsequent period of time, data of characteristics of the fuel and data of the volume of fuel injected during that period of time are collected, the volume of fuel injected is subtracted from each volume counter associated to each average value of the matrix, an average value of the collected data is determined, said average value is stored in the matrix and said average value is associated to the volume counter having a given initial value if the average value differs from the last average value stored by plus or minus a predetermined coefficient, -the characteristics to be applied to the nozzle are the last average value stored in the matrix, which is less than or equal to zero.

Inventors

  • STEPHANE ELOY
  • J. DILLON

Assignees

  • 纬湃科技有限责任公司

Dates

Publication Date
20260508
Application Date
20220127
Priority Date
20210201

Claims (10)

  1. 1. Method for determining a characteristic of a fuel to be applied to a nozzle (4) of an internal combustion engine, the internal combustion engine comprising a fuel tank (1), at least one nozzle (4) and a measuring sensor (3) for measuring the characteristic, the measuring sensor (3) being inserted in a conduit (5) connecting the fuel tank (1) and the at least one nozzle (4), the method being characterized in that: Collecting data of said characteristic of the fuel over a first period of time by means of a measuring sensor (3), determining an average value of said data collected and comparing it with a reference value, if the average value differs from the reference value of the average value of the data collected by a positive and negative predetermined coefficient, or if the matrix does not comprise said reference value, storing said average value of said data collected in the matrix and making said average value of said data collected a reference value, Each time a new reference value of the average value of the collected data occurs, it is associated to a volume counter, the initial value of which corresponds to the volume of the conduit between the measuring sensor (3) and the at least one nozzle (4), Collecting, for each subsequent time period, said data of said characteristic of the fuel and of the volume of fuel injected during each time period, subtracting the volume of fuel injected for each elapsed time period from each volume counter associated with each reference value of the matrix, The characteristic of the fuel to be applied to the nozzle is the earliest reference value of zero or less of the volume counter stored in the matrix.
  2. 2. The method of claim 1, wherein the predetermined coefficient corresponds to an error margin of a characteristic of fuel to be applied to the nozzle that is acceptable to the nozzle.
  3. 3. The method of claim 1, wherein the predetermined coefficient is between 2% and 5%.
  4. 4. A method according to any one of claims 1 to 3, wherein the volume counter and the reference value are deleted from the matrix when the volume counter associated with the reference value is equal to or less than zero.
  5. 5. A method according to any one of claims 1-3, characterized in that the characteristics of the fuel to be applied to the nozzle (4) of the internal combustion engine correspond to the ethanol content of the fuel.
  6. 6. A method according to any one of claims 1 to 3, wherein the characteristics of the fuel correspond to characteristics selected from the group consisting of density of the fuel, low heat of combustion PCI of the fuel, octane number of the fuel, cetane number of the fuel and ester content of the fuel.
  7. 7. A method according to any one of claims 1 to 3, characterized in that the characteristics of the fuel to be applied to the nozzle are estimated between the previous characteristics to be applied to the nozzle and the next characteristics of the fuel to be applied to the nozzle.
  8. 8. The method of claim 7, wherein the estimating comprises applying an affine rule passed by a feature of a last application, the affine rule having a slope equal to a gradient between a feature of a further last application and a feature of a last application, the affine rule being applied until a next feature to be applied is received.
  9. 9. The method of claim 7, wherein the estimating comprises applying an affine rule passed by a feature of a last application, the affine rule having a slope equal to a gradient between a feature of a further last application and a feature of a last application, the estimating being limited by a feature of a next application.
  10. 10. Engine control unit (2) of an internal combustion engine for implementing the method according to any one of claims 1 to 9.

Description

Fuel dispensing method Technical Field The technical field of the present invention is an apparatus and method for controlling the fuel supply of an internal combustion engine. Background Since the advent of internal combustion engines capable of operating with fuels having variable characteristics, it has been necessary to know with high accuracy the actual content of characteristics of the fuel injected into the combustion chamber of the engine (taux). In fact, the content of the characteristics of the fuel (for example ethanol) enables the quantity of fuel to be injected to be determined so as to achieve complete combustion of the fuel/air mixture, thus optimizing the engine performance. In contrast, incomplete combustion can affect engine performance and durability, can consume fuel, and can pollute the environment. Engines of this type need to be equipped with sensors for measuring various characteristics of the fuel. However, due to its inherent characteristics, such a sensor can only be placed in a position where the fuel pressure is low, i.e. between the fuel tank and the high pressure pump upstream of the fuel nozzle. There is then a delay between the characteristic quantity measured by the sensor and the characteristic quantity actually injected into the engine. This delay needs to be taken into account so that the operation of the engine is not interrupted when a fuel transition occurs (e.g. when a fuel change occurs). After, for example, the tank is full and the fuel in the tank has a new ethanol content, there is a transition volume of new fuel. The volume is between the fuel tank and the nozzle as measured by the ethanol content sensor. The ethanol content in the nozzle will change from an old content to a new content, during which transition it is necessary to know the ethanol content as accurately as possible in order to optimise the operation of the engine. One method is described in FR1858049 belonging to the present inventors. The method includes taking fuel consumption into account when restoring the ethanol content at the nozzle based on the ethanol content measured by the sensor. The method also takes into account the difference in volume around the sensor and around the nozzle, which affects the transition speed of the fuel. Finally, the method enables detection of fuel transitions based on a measurement of ethanol content. To account for delays during the alcohol content transition, the method continuously stores the results of the acquisition of the alcohol content sensor. The ethanol content acquisition results are stored in a matrix and delayed for recovery according to fuel consumption. The size of the matrix used then needs to be related to the distance between the sensor and the nozzle. However, the use of such a matrix requires a large amount of memory resources, and the further the sensor is from the nozzle, the more memory resources. Furthermore, since the measurement history needs to be kept, the matrix needs to be stored in a nonvolatile memory. This is particularly recommended when the content is changing and the computer is powered down. This may occur when the driver has just been full of fuel, moving the vehicle and is parked shortly thereafter. It goes without saying that the above method also makes it possible to determine the content of any product contained in the fuel that the nozzle actually perceives, provided that the corresponding measuring sensor is provided. Measuring sensors exist today that enable measuring various characteristics of the fuel, which further increases the amount of data stored, and thus the storage resources of e.g. the engine control unit. It is necessary to reduce the amount of characteristic data of fuel stored for determining the characteristic of fuel to be actually injected into the nozzle. Disclosure of Invention The invention therefore relates to a method for determining a characteristic of a fuel to be applied to a nozzle of an internal combustion engine, the internal combustion engine comprising a fuel tank, at least one nozzle and a measuring sensor for measuring the characteristic, the measuring sensor being inserted in a conduit connecting the fuel tank and the at least one nozzle, the method being characterized in that: collecting data of said characteristic of the fuel over a first period of time by means of a measuring sensor, determining an average value of said data collected and comparing it with a reference value, storing said average value of said data collected in a matrix if the average value differs from the reference value of the average value of the data collected by a positive and negative predetermined coefficient, or making said average value of said data collected a reference value if said matrix does not comprise said reference value, Each time a new reference value of the average value of the collected data occurs, it is associated to a volume counter (compteur de volume), the initial value of which correspon