KR20170064411A - Learning Method for Closing Time of An Injector - Google Patents

Learning Method for Closing Time of An Injector Download PDF

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Publication number
KR20170064411A
KR20170064411A KR1020150170204A KR20150170204A KR20170064411A KR 20170064411 A KR20170064411 A KR 20170064411A KR 1020150170204 A KR1020150170204 A KR 1020150170204A KR 20150170204 A KR20150170204 A KR 20150170204A KR 20170064411 A KR20170064411 A KR 20170064411A
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South Korea
Prior art keywords
learning
opening duration
injector
value
point
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KR1020150170204A
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Korean (ko)
Inventor
조현재
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현대오트론 주식회사
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Priority to KR1020150170204A priority Critical patent/KR20170064411A/en
Publication of KR20170064411A publication Critical patent/KR20170064411A/en

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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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
    • F02D41/2464—Characteristics of actuators
    • F02D41/2467—Characteristics of actuators for injectors
    • 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
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
    • F02M61/188—Spherical or partly spherical shaped valve member ends

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

One aspect of the present invention relates to a learning method of an opening duration of an injector.
According to an embodiment of the present invention, some durations of an opening duration of an injector are first learned, and an opening duration for the remaining area is learned based on the learning value, thereby reducing learning time and learning The stability of completion is improved.

Description

[0001] The present invention relates to a method for learning an opening duration of an injector,

One aspect of the present invention relates to a learning method of an opening duration of an injector. More particularly, the present invention relates to a method of learning some duration of an opening duration of an injector corresponding to a driving signal applied to an injector, which is divided into a nonlinear section and a linear section, and learning an opening duration for the remaining area based on the learned value .

The contents described in this section merely provide background information on the embodiment of the present invention and do not constitute the prior art.

The fuel injection method of a vehicle engine can be divided into a port injection method and a direct injection method. Here, the port injection system is mainly used for a gasoline engine, and a mixer mixed with air is injected into the cylinder by injecting fuel into the intake port.

The direct injection method is mainly used in diesel engines and injects fuel directly into the cylinder.

However, in recent years, attention has been paid to a technique of employing a direct injection method for a gasoline engine for the purpose of improving fuel consumption and output, and preventing environmental pollution. Such an engine is called a GDI (GDI), and when the intake valve is opened, air is sucked from the intake port into the combustion chamber and compressed by the piston, and the fuel is directly injected into the high- .

In the GDI engine, each injector is installed for each cylinder to inject fuel at high pressure. The solenoid of each injector opens the injection outlet and injects the fuel into the combustion chamber when the drive signal is applied from the controller, and closes the injection outlet when the injection is finished.

However, even when the injection ports of the respective injectors are opened at the same time, the timing at which the injection ports are closed for each of the injectors may vary due to wear and deterioration of the injector itself, internal friction of the needle or armature, As a result, the amount of fuel injected by each injector is varied.

The prior art uses a method of directly controlling the injector by converting the required fuel amount into a driving signal through a map in which the relationship between the required fuel amount of the driver and the driving signal for operating the injector is set.

However, even if the same drive signal is applied to the injector as described above, the injector opening amount is different for each injector, and the injector driving time and the injector opening amount are not simply proportional to each other, And if the amount of injected fuel is small, problems such as combustion instability, excessive particulate matter (PM), and the like may occur.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a fuel injection control apparatus and a fuel injection control method for an injector, ), And learns an opening duration for the remaining area based on the learning value.

Another object of the present invention is to provide a control method for controlling a fuel amount of an injector by converting a required fuel amount to an opening duration and setting a relationship between an opening duration and an injector driving signal for more precise fuel amount control.

The technical object of the present invention is not limited to the above-mentioned technical objects and other technical objects which are not mentioned can be clearly understood by those skilled in the art from the following description will be.

According to one aspect of the present invention, there is provided a method of learning an opening duration, which is divided into a nonlinear section and a linear section of the injector by inputting a driving signal to the injector,

A learning point setting step of setting a learning point; A drive signal applying step of applying a drive signal corresponding to the learning point; A linear interval checking step of checking whether the learning point is located in a linear interval;

A partial area learning step of obtaining a learning value of an opening duration for the driving signal for a partial area of the linear section when the learning point is located in the linear section; A difference value acquiring step of comparing the learning value learned previously with the learning value acquired at the learning point located in the linear section and securing the difference value; And

And a remaining region learning step of obtaining a learning value of the remaining region excluding the partial region of the linear region based on the obtained difference value.

Wherein the determining whether the learning point is located in the linear region in the linear region identifying step determines that the learning region is located in the linear region when the driving signal is greater than the set value by comparing the driving signal with the set value, can do.

And the learning point is a predetermined number in the partial region learning step.

The predetermined number of learning points may be located within a predetermined range after entering the linear section in the nonlinear section.

The remaining region learning step may calculate an average value of the calculated differences and acquire a learning value of the remaining region through the average value.

And the previously learned learning value is a learning value already learned and learned before learning the opening duration at the learning point located in the linear section.

According to another aspect of the present invention, there is provided a method for driving an injector, the method including: applying a signal to an injector; learning an opening duration corresponding to the driving signal, wherein the opening duration is divided into a nonlinear section and a linear section; , A learning method of an opening duration of an injector,

A learning point setting step of setting a learning point; And

Learning the opening duration value at the learning point, comparing the opening duration value learned by the first learning with the opening duration value previously learned at the learning point to secure a difference value, and based on the obtained difference value And an opening duration learning step of learning the opening duration value a second time.

A linear interval checking step of checking whether a driving signal corresponding to the learning point or the learning point is located in a linear interval between the learning point setting step and the opening duration learning step is performed.

The first learning is performed in a partial area of the linear section, and the second learning is performed in a remaining area excluding the partial area of the linear section.

According to another aspect of the present invention, there is provided a method for driving an injector, the method including: applying a driving signal to an injector and learning an opening duration corresponding to the driving signal, wherein the opening duration is a nonlinear section and a linear section CLAIMS 1. A method of learning the linear interval during an opening duration of an injector,

A drive signal applying step of applying a drive signal to a part of the linear section of the injector; An opening duration learning step of learning an opening duration value corresponding to the driving signal based on an output voltage outputted from the injector; Obtaining a difference value by comparing the learned opening duration value with a previously learned opening duration value; And

And an opening duration determining step of determining an opening duration value for the remaining area of the linear section based on the obtained difference value.

According to another aspect of the present invention, there is provided a method for driving an injector, including: applying a driving signal corresponding to a preset learning point to an injector; learning an opening duration corresponding to the driving signal; A learning unit for learning an opening duration of the injector, the learning unit being divided into a nonlinear section and a linear section,

A learning point setting unit for setting a learning point; A linear interval checking unit for checking whether a driving signal corresponding to the learning point or the learning point is located in a linear interval; And

The learning duration is firstly learned at the learning point when the learning point or the driving signal is located in the linear section, and the opening duration value learned previously at the learning point is And an opening duration learning unit for acquiring a difference value by comparing the first difference value and a second learning value of the opening duration value based on the obtained difference value.

The first learning is performed in a partial area of the linear section, and the second learning is performed in a remaining area excluding the partial area of the linear section.

As described above, according to the embodiment of the present invention, in the opening duration learning by learning some intervals in the opening duration of the injector and learning the opening duration for the remaining area based on the learning value, Reduced learning time and stability of learning completion are improved

According to another embodiment of the present invention, the fuel amount of the injector can be precisely controlled by converting the required fuel amount into the opening duration and setting the relationship between the opening duration and the injector driving signal.

In addition, the effects of the present invention have various effects such as excellent general versatility according to the embodiments, and such effects can be clearly confirmed in the description of the embodiments described later.

1 shows the relationship between the amount of fuel injected by the injector and the operating time during which the injector is electrically operated.
Fig. 2 schematically shows a basic configuration of the injector.
Figure 3 (a) schematically shows a typical current operating profile for the injector.
Fig. 3 (b) shows the time at which the injection outlet of the injector is opened and the time at which the injection outlet is closed.
FIG. 4 is a graphical representation of a variation in the opening amount of each injection port of each injector installed in each cylinder in the ballast section.
FIG. 5 shows learning of the opening duration for each injector installed for each cylinder, and the deviation shown in FIG. 4 is compensated by the fine precision control using the learning result.
6 (a) shows the relationship between the opening duration and the driving signal obtained by the opening duration learning.
6 (b) shows the relationship between the amount of fuel and the opening duration.
7 shows a method of controlling an injector according to an embodiment of the present invention.
8 shows a fuel amount control method of an injector according to another embodiment of the present invention.
9 shows a process of learning an opening duration by applying a driving signal.
10 shows a first embodiment of an opening duration learning method according to the present invention.
11 shows a second embodiment of an opening duration learning method according to the present invention.
12 shows a third embodiment of the opening duration learning method according to the present invention.
13 shows an apparatus for learning an opening duration according to another embodiment of the present invention.

Hereinafter, an embodiment of the present invention will be described in detail with reference to exemplary drawings.

It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In addition, the size and shape of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, terms specifically defined in consideration of the constitution and operation of the present invention are only for explaining the embodiments of the present invention, and do not limit the scope of the present invention.

Fig. 1 shows the relationship between the amount of fuel m injected by the injector into the combustion chamber and the operating time Ti during which the injector is electrically operated. In Fig. 1, the X axis is expressed in microseconds (μs), and the Y axis is expressed in milligrams (mg). In addition, a plurality of profiles shown in Fig. 1 are shown, which show the relationship profiles of the fuel amount m of the plurality of injectors and the operating time Ti.

Here, the amount of fuel m injected by the injector into the combustion chamber can be shown as a function of the operating time Ti in which the injector is electrically operated.

1, the fuel amount m injected by the injector in the control system employing the direct injection method can be divided into sections in which the injector is operated differently according to the operating time Ti, This interval may be generally termed a ballistic interval, a transient interval, and a non-ballistic interval.

The ballast section A may mean a period in which the fuel amount m increases sharply even if the operating time Ti is slightly changed. The transient section B may mean a section in which the change of the fuel quantity m is not large even if the operation time Ti changes greatly. The ballast section (A) and the transient section (B) are nonlinear sections. On the other hand, the non-balancing section C may mean a section in which the operating time Ti and the fuel amount m are in a linear relationship as a linear section. In the non-linear section in Fig. 1, the relationship profiles of the plurality of injectors do not coincide, but generally agree in the linear section.

On the other hand, the operating time Ti during which the injector is electrically operated may correspond to the driving signal Ti applied to the injector by the controller or the driving time Ti during which the electrical signal is applied to the injector to drive the injector. Here, the drive signal Ti may be input to the injector in the form of a PWM control signal, for example. Therefore, in the following description, the operation time Ti in which the injector is electrically operated is described as a drive signal Ti applied to the injector.

Fig. 2 schematically shows a basic configuration of the injector.

Fig. 2 (a) shows a state in which the injector is in the closed state, and Fig. 2 (b) shows the state in the open state.

The injector 100 includes a valve 120 for opening and closing the injection port 110 according to an embodiment of the present invention and a needle 130 connected to the valve 120 at an end thereof and a needle 130, A solenoid coil 160 disposed around the armature 140 and forming a path of an electromagnetic field, a solenoid coil 160 forming a solenoid magnetic field, a moved needle 130 and an armature 140 And a return spring 170 for returning the solenoid coil 160. The solenoid coil 160 may be electrically connected to a control unit (not shown) by a wire harness 180 to receive a control signal.

An electromagnetic field is formed in the magnetic member 150 when the control signal is applied to the solenoid coil 160 and the attracting force is generated by the magnetic force and the magnetic force of the magnetic member 150 so that the armature 140 And the armature 140 may move in the manner of opening or closing the injection outlet 110 by moving the needle 130. FIG. 2 (b) shows the armature, needle, and valve moving upwards and opening the injection outlet 110.

Figure 3 (a) schematically shows a typical current operating profile for the injector. Fig. 3 (b) shows the time at which the injection outlet of the injector is opened and the time at which the injection outlet is closed. 3 (a), the X-axis represents time (t) and the Y-axis represents the intensity of the current (I) or voltage (V). Where the thick line represents the time profile for current (I), and the thin line represents the time profile for voltage (V).

3B shows a state in which the valve of the injector is mechanically delayed and lifted to lift the injection port 110 at a time point P when the injection port 110 is opened, 110) is closed. FIG. 3 (b) shows that the valve 120 is rapidly accelerated at the opening time P, is opened, is kept in the open state, and is closed at the closing time Q.

The open time P corresponds to a position slightly less than the current maximum I_peak of the time profile for the current I and the closing time Q corresponds to the position of the inflection point I_point of the time profile for the voltage V .

The control unit for controlling the open time P or the closing time Q of the injector 100 transmits a control signal to the injector 100 to open or close the injection outlet 110 of the injector 100.

When the boost voltage V_boost is applied until the current I flowing through the solenoid coil 160 of the injector 100 reaches the current maximum value I_peak by the control signal, The injection outlet 110 of the injection pump 100 is accelerated.

The starting point of the electrical operation of the injector 100 is determined in a process in which the boost voltage V_boost is applied to reach the current maximum value I_peak and the start point of the electrical operation is determined as the start point of the electrical operation of the injection outlet 110 of the injector 100 (P). ≪ / RTI >

The open time P of the injection outlet 110 is a time point at which an electrical signal is input to the injector 100 and the needle 130 is suddenly accelerated and lifted so that the injectors 100 installed for each cylinder are all the same or similar. Therefore, in this specification, the opening time P of the injection outlet 110 of the injector 100 is not mentioned. However, even if it is not mentioned, the scope of the right is not excluded when the opening time P of the injection outlet 110 changes.

When the current flowing in the solenoid coil 160 of the injector 100 is cut off by the switching-off, the self-induced voltage V is formed in the solenoid coil 160 in the currentless state, Induces a current flow through solenoid coil 160 which again produces a magnetically induced voltage V while reducing the magnetic field. The self-induced voltage V is expressed as a negative voltage V in FIG. 3 (a) and converges to zero volts (V) over time. After the decrease of the magnetic force, the injection outlet 110 of the injector 100 is closed by the restoring force caused by the elastic force of the return spring 170, the fuel pressure, and the like.

An inflection point I_point may be formed in the time profile for the voltage V in the course of convergence of the self-induced voltage V to 0 volts by switching off, and at the time point when the inflection point I_point is formed (Q) of the injecting outlet 110 of the injector 100. [0064]

The opening duration corresponds to the time during which the injector 100 is open and may be a time period during which the fuel is injected. The opening duration P of the injector 100 and the closing time point Q). ≪ / RTI >

The learning of the closing duration Q corresponding to the driving signal Ti is performed only when the learning of the opening duration is completed because the opening time P of all the injectors 100 installed for each cylinder is the same or similar, .

FIG. 4 is a graphical representation of a variation in the opening amount of each injection port of each injector installed in each cylinder in the ballast section. The X axis in FIG. 4 represents the time (t) axis expressed in microseconds (μs), and the Y axis represents the lift amount of the needle 130 of the injector expressed in micrometers (μm).

FIG. 5 shows learning of the opening duration for each injector installed for each cylinder, and the deviation shown in FIG. 4 is compensated by the fine precision control using the learning result.

Even if the opening timing P of the injection outlet 110 is the same in the balancing section A, the closing timing Q is different from that of the injector 100 in spite of applying the same driving signal Ti to the injector 100, 100 reaches the full lift, but some injectors 100 are in a state where they can not reach the full lift. That is, even if the same driving signal Ti is applied, the opening durations of the injectors 100 installed in the cylinders are different from each other. This difference in offing duration leads to a difference in amount of fuel injected into the combustion chamber, so that it is difficult to precisely control the injection.

The type of each injector 100 installed for each cylinder is determined according to the size of the fuel amount m injected by each injector 100 when the same driving signal Ti is applied, The injector 100 may be divided into a normal injector 100 and a maximum injector 100. The nominal injector 100 may be selected as the reference injector 100 and the driving signal Ti for the reference injector 100 and the opening The relationship of duration is determined and mapped and the driving duration Ti of each injector 100 is determined such that the same opening duration as that of the reference injector 100 is output, Output.

1 and 3, it is necessary to learn an opening duration for all the injectors 100 in order to ensure that the opening durations of all the injectors 100 are equalized. The learning of the opening duration is performed by applying various preset drive signals Ti to all the injectors 100 and receiving the output voltage V generated by self-induction at the time of switching off, The profile may be analyzed to determine the inflection point I_point and a method of determining the closing time Q or the opening duration of the injection outlet 110 based on the inflection point I_point.

By learning the opening duration for each injector 100, the relationship between the driving signal Ti and the opening duration is determined for all the injectors 100 and mapping (see FIG. 6 (a) to be described later) The opening duration of all the injectors 100 can be matched by determining the driving signal Ti of the injector 100 other than the reference injector 100 so that an opening duration equal to or similar to the opening duration of the injector 100 is output.

6 (a) shows the relationship between the opening duration and the driving signal obtained by the opening duration learning. The profile of FIG. 6A is obtained by applying a driving signal Ti corresponding to a predetermined plurality of learning points to the injector 100 and finding the inflection point I_point on the time profile of the output voltage V, (Q), that is, the opening duration, is determined and mapped.

6A shows the relationship between the opening duration and the driving signal Ti in a ballast, a transient section B and a non-ballistic section C, (m) and the drive signal Ti. The similar reason will be explained by Fig. 6 (b) which will be described later.

6 (b) shows the relationship between the amount of fuel and the opening duration.

On the other hand, as described above, since the opening duration is the fuel injection time, it directly affects the fuel amount m injected into the combustion chamber. Therefore, the amount of fuel m injected by the injector 100 may be a linear relationship, though there may be some off-set in relation to the opening duration. Thus, by mapping the relationship between the fuel amount m and the opening duration (see Fig. 6B) and mapping the relationship between the opening duration and the driving signal Ti (see Fig. 6A), the controller It is possible to select and output the drive signal Ti corresponding to the required fuel amount requested by the driver.

7 shows a method of controlling an injector according to an embodiment of the present invention.

The injector control method according to an embodiment of the present invention may be based on an opening duration and may apply a driving signal Ti to each of a plurality of injectors 100 and secure a time profile for the output voltage V (S100);

A second step (S110) of evaluating the time profile to determine a closing timing (Q) of the injector (100); A third step S120 of learning the opening duration of the injector 100 based on the closing timing Q; A fourth step (S130) of selecting the reference injector (100) among the plurality of injectors (100); And

And a fifth step S140 of determining a driving signal Ti to be input to the remaining injectors 100 excluding the reference injector 100 based on the learned opening duration of the reference injector 100 .

Here, the time profile for the output voltage V may be an aspect indicating that the intensity of the output voltage V changes with the lapse of time.

Also, in the first step S100, the output voltage V may be the magnitude of the magnetic induction voltage V generated by the current flow to the injector 100 generated by the drive signal Ti, have. Specifically, the solenoid coil 160 of the injector 100 may be a magnetic induction voltage V that is generated by an external power supply and is generated by interrupting an external power supply.

The determination of the closing timing Q of the injector 100 by evaluating the time profile in the second step S110 finds the inflection point I_point in the time profile of the magnetic induction voltage V according to the embodiment, I < / RTI > For example, the inflection point I_point can be formed in the process of decaying the self induced voltage V in the time profile of the magnetic induction voltage V, and the point at which the inflection point I_point is formed is the closing point Q).

That is, the second step S110 includes the step of evaluating the time profile of the output voltage V, finding the inflection point I_point in the time profile, and determining the closing time Q based on the inflection point I_point .

 In the fourth step S130, the reference injector 100 may be arbitrarily selected among the plurality of injectors 100, but may be selected by comparing the learned opening durations of the plurality of injectors 100 according to the embodiment . Specifically, the reference injector 100 can be selected from the injectors 100 having a median value when the opening amounts corresponding to the learned opening durations of the plurality of injectors 100 are divided into a maximum value, a middle value, and a minimum value.

Here, the fuel amount m corresponding to the opening duration may be selected through the relationship between the fuel amount m and the opening duration, and the injectors having the maximum value, the middle value, and the minimum value may be selected from the maximum injector 100, And may correspond to a nominal injector 100 and a minimum injector 100.

In the fifth step S140, the learned opening duration of the injector 100 excluding the reference injector 100 is matched with the learned opening duration of the reference injector 100, and the driving signal Ti of each of the remaining injectors 100 And the drive signal Ti of the reference injector 100 to determine the drive signal Ti of each of the remaining injectors 100 corresponding to the drive signal Ti of the reference injector 100, The driving signal Ti to be inputted can be determined.

Meanwhile, in an embodiment of the present invention, the driving signal Ti determined in the fifth step S140 is applied to each of the remaining injectors 100 to control the fuel amount m of the injector 100 ); ≪ / RTI > In the sixth step S150, the fuel amount m may be determined by applying the relationship between the opening duration mapped to the fuel amount m and the mapped fuel amount m according to the embodiment. The fuel amount m in the sixth step S150 may be determined by applying the relationship between the learned opening duration of the reference injector 100 and the fuel amount m in accordance with the embodiment. Here, the relationship between the learned opening duration of the reference injector 100 and the fuel amount m may be a map mapped.

8 shows a fuel amount control method of an injector according to another embodiment of the present invention.

The fuel amount control method of the injector 100 according to another embodiment of the present invention is a method of controlling the fuel amount of an engine in which a plurality of injectors 100 having solenoid coils 160 are installed,

A driving signal applying step (S200) of applying a driving signal (Ti) to the solenoid coil (160) for each of the plurality of injectors (100); (S210) for blocking the flow of current flowing through the solenoid coil (160) by applying the drive signal (Ti) so that the coil is in a no-current state;

A time profile detecting step (S220) of detecting a time profile of a voltage (V) induced in the coil in the no-current state; A closing time determination step (S230) of determining a closing timing (Q) of the injector (100) based on the detected time profile;

(P) of the injector (100) based on the driving signal (Ti), and determines an opening duration (P) between the opening duration (P) and the closing timing An opening duration learning step (S240) for learning the relation; And

After the reference injector 100 is selected from the plurality of injectors 100, the remaining injector 100 excluding the reference injector 100 is selected based on the relationship between the driving signal Ti of the reference injector 100 and the opening duration. And a driving signal determining step S250 for determining the driving signal Ti.

According to the embodiment, the closing time Q in the closing time determination step S230 may be determined based on the inflection point (I_point) of the time profile. Also, according to the embodiment, the opening duration in the opening duration learning step S240 may be defined as a time interval between the opening time P and the closing time Q. [

9 shows a process of learning an opening duration by applying a driving signal. Fig. 9 shows learning points displayed on the profile showing the relationship between the driving signal and the opening duration in Fig. 6 (a).

First, a plurality of learning points can be set to learn the relationship between the driving signal Ti and the opening duration. Here, the learning point may mean the driving signal Ti. That is, since the drive signal Ti corresponds to the operation time Ti in which the injector 100 is electrically operated, setting the plurality of learning points may be equivalent to applying the drive signal Ti at various time intervals .

It is possible to set any point out of the nonlinear section of the ballast section A or the transient section B or the linear section of the non-ballast section C to the start point of learning a, The learning period t is started in the order of the learning point b, the learning point c, the learning point d and the learning point e while gradually decreasing the time interval of the driving signal Ti by gradually starting the application of the driving signal Ti. It is possible to proceed to the point where it is not detected or the point where the colliding arm is not formed. Here, the fact that the opening duration is not detected means that the inflection point (I_point) is not detected in the time profile of the output voltage (V).

The driving signal Ti applied at the learning point of the minimum time interval during which the opening duration is detected can be mapped as the driving signal Ti_min corresponding to the minimum injection amount of the injector.

As described above, the learning can be performed while moving the learning point to the left side of the opening duration profile of FIG. 9, but conversely, learning can be performed while moving the learning point from the learning starting point (a) to the right side.

The learning point b ', the learning point c', the learning point d ', and the learning point d', starting to apply the driving signal Ti at the learning start point a and gradually increasing the time interval of the driving signal Ti, And learning point (e '). In FIG. 9, learning proceeds while moving the learning point to the right, which indicates the process of learning for the linear section.

10 shows a first embodiment of an opening duration learning method according to the present invention.

The opening duration learning method according to the present embodiment is a method for learning an opening duration that is divided into a nonlinear section and a linear section of the injector 100 by inputting a driving signal Ti to the injector 100 ,

A learning point setting step (S300) of setting a learning point; A drive signal application step (S310) of applying a drive signal (Ti) corresponding to the learning point; A linear interval checking step (S320) of checking whether the learning point is located in a linear interval;

A partial area learning step (S330) of obtaining a learning value of an opening duration for the driving signal (Ti) with respect to a partial area of the linear section when the learning point is located in the linear section; A difference value acquiring step (S340) of comparing the learning value learned previously with the learning value acquired at the learning point located in the linear section and ensuring the difference value; And

And a remaining region learning step (S350) of obtaining a learning value of the remaining region excluding the partial region of the linear region based on the obtained difference value.

According to an embodiment, whether or not the learning point is located in the linear section in the linear interval checking step S320 may be determined by comparing the driving signal Ti with a set value, and if the driving signal Ti is larger than the set value It can be judged that it is located in the linear section.

In the partial area learning step S330, the learning point may be a predetermined number, and the predetermined number of learning points may be located within a predetermined range after entering the linear section in the nonlinear section.

According to the embodiment, the remaining region learning step S350 may calculate the average value of the calculated differences and obtain the learning value of the remaining region through the average value.

According to an embodiment, the previously learned learning value may be a learning value already learned and learned before learning the opening duration at the learning point located in the linear section.

11 shows a second embodiment of an opening duration learning method according to the present invention.

Meanwhile, in the opening duration learning method according to the present embodiment, a signal is applied to the injector 100, and an opening duration corresponding to the driving signal Ti is learned. The opening duration includes a non- In the learning method of the opening duration of the injector (100) divided into sections,

A learning point setting step (S400) of setting a learning point; And acquiring a difference value by comparing the first learned opening duration value with the previously learned opening duration value at the learning point to obtain a difference value, And an opening duration learning step (S410) of learning the opening duration value a second time.

 According to an embodiment of the present invention, between the learning point setting step (S400) and the opening duration learning step (S410), a linear interval for checking whether the driving point (Ti) corresponding to the learning point or the learning point is located in the linear interval (S405). ≪ / RTI >

According to an embodiment, the first learning may be performed in a partial area of the linear section, and the second learning may be performed in a remaining area except the partial area of the linear section.

12 shows a third embodiment of the opening duration learning method according to the present invention.

The opening duration learning method according to the present embodiment applies a driving signal Ti to the injector 100 and learns an opening duration corresponding to the driving signal Ti, A method of learning the linear interval of an opening duration of an injector (100), the linear interval being divided into a linear interval,

A driving signal applying step (S500) of applying a driving signal (Ti) to a part of the linear section of the injector (100); An opening duration learning step (S510) of learning an opening duration value corresponding to the driving signal (Ti) based on the output voltage outputted from the injector (100); Comparing the learned opening duration value with a previously learned opening duration value to secure a difference value (S520); And

And an opening duration determination step S530 of determining an opening duration value for the remaining area of the linear section based on the obtained difference value.

13 shows an apparatus for learning an opening duration according to another embodiment of the present invention.

The opening duration learning apparatus 600 according to the present embodiment applies a driving signal Ti corresponding to a predetermined learning point to the injector 100 and generates an opening duration corresponding to the driving signal Ti, And the opening duration learns the opening duration of the injector 100, which is divided into a nonlinear section and a linear section.

The opening duration learning apparatus 600 according to the present embodiment includes a learning point setting unit 610 for setting a learning point; A linear section identifying unit (620) for checking whether the learning point or the driving signal (Ti) corresponding to the learning point is located in a linear section; And

Wherein when the learning point or the driving signal (Ti) is located in the linear section, an opening duration value is firstly learned at the learning point, and the first learned opening duration value and the previously learned opening duration And an opening duration learning unit 630 for acquiring a difference value by comparing the duration values and performing a second learning of the opening duration values based on the obtained difference values.

The above description is only illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention.

The embodiments disclosed in the present invention are not intended to limit the scope of the present invention and are not intended to limit the scope of the present invention.

The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

100: injector
110: injection outlet
120: Valve
130: Needle
140: Amateur
150:
160: Solenoid coil
170: return spring
180: Wire harness
600: opening duration learning device
610: Learning point setting unit
620: Linear section check section
630: opening duration learning unit

Claims (12)

A method for learning an opening duration, which is divided into a nonlinear section and a linear section of the injector by inputting a driving signal to the injector,
A learning point setting step of setting a learning point;
A drive signal applying step of applying a drive signal corresponding to the learning point;
A linear interval checking step of checking whether the learning point is located in a linear interval;
A partial area learning step of obtaining a learning value of an opening duration for the driving signal for a partial area of the linear section when the learning point is located in the linear section;
A difference value acquiring step of comparing the learning value learned previously with the learning value acquired at the learning point located in the linear section and securing the difference value; And
A remaining region learning step of obtaining a learning value of the remaining region excluding the partial region of the linear region based on the obtained difference value;
/ RTI > The method according to claim 1,
Wherein the determining whether the learning point is located in the linear region in the linear region identifying step determines that the learning region is located in the linear region when the driving signal is greater than the set value by comparing the driving signal with the set value, Opening duration learning method. The method according to claim 1,
And the learning points in the partial region learning step are preset. The method of claim 3,
Wherein the predetermined number of learning points are located within a predetermined range after entering the linear section in the nonlinear section. The method according to claim 1,
Wherein the remaining region learning step calculates an average value of the calculated differences and acquires a learning value of the remaining region through the average value. The method according to claim 1,
Wherein the previously learned learning value is a learning value already learned and learned before learning the opening duration at the learning point located in the linear section. A method of learning an opening duration of an injector, the method comprising: applying a signal to an injector and learning an opening duration corresponding to the driving signal, wherein the opening duration is divided into a nonlinear section and a linear section,
A learning point setting step of setting a learning point; And
Learning the opening duration value at the learning point, comparing the opening duration value learned by the first learning with the opening duration value previously learned at the learning point to secure a difference value, and based on the obtained difference value An opening duration learning step of learning the opening duration value a second time;
/ RTI > 8. The method of claim 7,
And a linear interval checking step of checking whether a driving signal corresponding to the learning point or the learning point is located in a linear interval between the learning point setting step and the opening duration learning step. 8. The method of claim 7,
Wherein the first learning is performed in a partial area of the linear section, and the second learning is performed in a remaining area excluding the partial area of the linear section. A method of learning a linear interval of an opening duration of an injector, which is divided into a nonlinear section and a linear section, by applying a driving signal to the injector and learning an opening duration corresponding to the driving signal, In this case,
A drive signal applying step of applying a drive signal to a part of the linear section of the injector;
An opening duration learning step of learning an opening duration value corresponding to the driving signal based on an output voltage outputted from the injector;
Obtaining a difference value by comparing the learned opening duration value with a previously learned opening duration value; And
Determining an opening duration value for the remaining area of the linear section based on the obtained difference value;
/ RTI > The driving duration of the injector is divided into a nonlinear section and a linear section, and the opening duration of the injector is divided into a nonlinear section and a linear section. In the learning apparatus,
A learning point setting unit for setting a learning point;
A linear interval checking unit for checking whether a driving signal corresponding to the learning point or the learning point is located in a linear interval; And
The learning duration is firstly learned at the learning point when the learning point or the driving signal is located in the linear section, and the opening duration value learned previously at the learning point is An opening duration learning unit for acquiring a difference value by comparing and learning an opening duration value based on the obtained difference value;
And an opening duration learning device. 12. The method of claim 11,
Wherein the first learning is performed in a partial area of the linear section, and the second learning is performed in a remaining area excluding the partial area of the linear section.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101957516B1 (en) * 2017-11-23 2019-03-12 현대오트론 주식회사 Injector drive time control method by area
CN110872998A (en) * 2018-09-03 2020-03-10 现代自动车株式会社 Method for verifying CVVD position learning result and CVVD system for verifying CVVD position learning result
KR102214575B1 (en) * 2019-12-10 2021-02-10 주식회사 현대케피코 Injector control method for 48v mild hybrid vehicle and control apparatus thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101957516B1 (en) * 2017-11-23 2019-03-12 현대오트론 주식회사 Injector drive time control method by area
CN110872998A (en) * 2018-09-03 2020-03-10 现代自动车株式会社 Method for verifying CVVD position learning result and CVVD system for verifying CVVD position learning result
CN110872998B (en) * 2018-09-03 2023-02-17 现代自动车株式会社 Method for verifying CVVD position learning result and CVVD system for verifying CVVD position learning result
KR102214575B1 (en) * 2019-12-10 2021-02-10 주식회사 현대케피코 Injector control method for 48v mild hybrid vehicle and control apparatus thereof

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