KR20170072061A - Method and appartus for measuring pressure of high-pressure fuel pump - Google Patents

Method and appartus for measuring pressure of high-pressure fuel pump Download PDF

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Publication number
KR20170072061A
KR20170072061A KR1020150180439A KR20150180439A KR20170072061A KR 20170072061 A KR20170072061 A KR 20170072061A KR 1020150180439 A KR1020150180439 A KR 1020150180439A KR 20150180439 A KR20150180439 A KR 20150180439A KR 20170072061 A KR20170072061 A KR 20170072061A
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KR
South Korea
Prior art keywords
pressure
pressure sensor
fuel pump
output value
engine
Prior art date
Application number
KR1020150180439A
Other languages
Korean (ko)
Inventor
김성재
이진섭
Original Assignee
주식회사 현대케피코
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Priority to KR1020150180439A priority Critical patent/KR20170072061A/en
Publication of KR20170072061A publication Critical patent/KR20170072061A/en

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Classifications

    • 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
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • 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
    • F02D41/2474—Characteristics of sensors
    • 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
    • F02D41/2477—Methods of calibrating or learning characterised by the method used for learning
    • F02D41/248—Methods of calibrating or learning characterised by the method used for learning using a plurality of learned values
    • 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
    • F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
    • 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
    • F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
    • F02M65/003—Measuring variation of fuel pressure in high pressure line
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • 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
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
    • F02D2041/223—Diagnosis of fuel pressure sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0602—Fuel pressure
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

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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)
  • General Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

The present invention relates to a method and an apparatus for measuring the pressure of a high-pressure fuel pump, comprising a first step of detecting whether the engine is stopped, Of Line: Before the Vehicle Production After Fuel Injection) state, and if it is not the EOL state in the second step, it is determined whether the time when the engine is continuously stopped exceeds the predetermined time A fourth step of detecting whether the low pressure fuel pump is in operation when the time period during which the engine is continuously stopped in the third step is over a preset time, A fifth step of subtracting the output value of the high-pressure sensor for measuring the fuel pressure of the high-pressure fuel pump from the output value of the low-pressure sensor for measuring the fuel pressure of the low-pressure fuel pump, And a sixth step of correcting the output value of the high-pressure sensor using the learning value calculated in the fifth step, wherein the high-pressure sensor output value is changed to the low-pressure sensor output value or the atmospheric-pressure sensor output value having a small error, The error can be reduced.

Description

TECHNICAL FIELD [0001] The present invention relates to a high pressure fuel pump,

The present invention relates to a method and an apparatus for measuring a pressure of a high-pressure fuel pump, and more particularly, to a method and an apparatus for measuring a pressure of a high-pressure fuel pump for measuring a pressure of injecting high-pressure fuel into an engine.

The gasoline direct injection engine (GDI) is a fully combustible engine in which the mixture ratio is leaner than that of the lean-burn engine by directly injecting gasoline into a cylinder filled with air in advance.

Generally, in a GDI engine system, a high pressure pump and a high pressure injector are used for high pressure injection, and a piston of a high pressure pump used for forming a high pressure forms a pressure on a fuel rail while performing compression / .

In the GDI engine system, it is necessary to know the pressure of the high-pressure fuel pump to inject the required amount of fuel into the injector. If the pressure of the high-pressure fuel pump is not known accurately, an error occurs in driving the high- The injection period signal is distorted, which causes a serious problem to the vehicle.

Therefore, it is important to accurately recognize the pressure of the high-pressure fuel pump in the GDI engine system, and as a result, the diagnosis of the high-pressure sensor is important in the GDI engine.

However, in the past, only the battery power was connected. Therefore, it is impossible to judge whether the pressure is recognized to be lower than the actual pressure or when the pressure is recognized to be higher than the actual pressure due to the failure of the high-pressure sensor. There is a problem that it is not possible to judge the case of recognizing it with a specific pressure irrespective of the pressure.

The present invention has been made in order to solve the problems of the pressure measuring method and apparatus of the conventional high-pressure fuel pump as described above, and it is an object of the present invention to provide a high pressure fuel pump which can reduce the error of a sensor And an object of the present invention is to provide a measurement method and apparatus.

In order to achieve the above object, a method for measuring a pressure of a high-pressure fuel pump according to the present invention includes a first step of detecting whether an engine is stopped, a step of using information of an electronic control unit when the engine is stopped in the first step And determining whether or not the engine is in an EOL state in a second step of determining whether the engine is in an EOL (End Of Line) state, A fourth step of detecting whether or not the low pressure fuel pump is in operation when the time period during which the engine is continuously stopped in the third step exceeds a preset time, Pressure fuel pump for measuring the fuel pressure of the high-pressure fuel pump is subtracted from the output value of the low-pressure sensor for measuring the fuel pressure of the low-pressure fuel pump, A fifth step of calculating a wet value, and a sixth step of correcting the output value of the high pressure sensor using the learning value calculated in the fifth step.

At this time, in the EOL state in the second step, it is also possible to perform the fourth step.

In the fourth step, when the low-pressure fuel pump is stopped, the output value of the high-pressure sensor may be subtracted from the output value of the atmospheric pressure sensor for measuring the atmospheric pressure at the place where the vehicle is placed.

At this time, in the sixth step, it is also possible to calculate the correction value by adding the learning value to the output value of the high-pressure sensor.

According to another aspect of the present invention, there is provided an apparatus for measuring a pressure of a high-pressure fuel pump, including: an atmospheric pressure sensor for measuring an atmospheric pressure at a place where a vehicle is placed; Pressure sensor, a high-pressure sensor for measuring the fuel pressure of the high-pressure fuel pump, and an output value of the atmospheric-pressure sensor or an output value of the low-pressure sensor at the time of stopping the engine, And a control unit for correcting the output value of the high-pressure sensor through the control unit.

As described above, according to the method and apparatus for measuring the pressure of the high-pressure fuel pump according to the present invention, the learning value can be calculated and the error of the high-pressure sensor can be reduced.

1 is a flowchart of a method of measuring a pressure of a high-pressure fuel pump according to an embodiment of the present invention,
2 is a configuration diagram of a pressure measuring device for a high-pressure fuel pump according to an embodiment of the present invention,
3 is a graph showing an output value graph of a high-pressure sensor by a conventional pressure measuring method,
4 is a graph showing the high-pressure sensor output value when the low-pressure sensor is corrected on the basis of the graph,
5 is a graph of the high-pressure sensor output value when the correction is made on the basis of the atmospheric pressure sensor.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2, an apparatus for measuring the pressure of a high-pressure fuel pump according to an embodiment of the present invention includes an atmospheric pressure sensor 40, a low-pressure sensor 20, a high-pressure sensor 30, . At this time, the low-pressure sensor 20 is connected to the low-pressure fuel pump 2 of the vehicle, and the high-pressure sensor 30 is connected to the high-pressure fuel pump 3 of the vehicle. The low pressure sensor 20, the high pressure sensor 30 and the atmospheric pressure sensor 40 are connected to an electronic control unit (ECU) 10 of the vehicle. The control unit (not shown) is provided in the electronic control unit 10.

The atmospheric pressure sensor 40 measures an atmospheric pressure at a place where the vehicle is placed and outputs an output value of the atmospheric pressure sensor 40. The low pressure sensor 20 measures the fuel pressure of the low pressure fuel pump 2, The high pressure sensor 30 measures the fuel pressure of the high-pressure fuel pump 3 and outputs the output value of the high-pressure sensor 30.

The control unit (not shown) subtracts the output value of the high-pressure sensor 30 from the output value of the low-pressure sensor 20 when the low-pressure fuel pump 2 is operating in the state where the engine 1 is in an end state. The time when the engine 1 is in the final state and the low-pressure fuel pump 2 is in the stop state, the EOL (End Of Line: before injection of the vehicle post-production fuel) If the preset time is exceeded, the output value of the high-pressure sensor 30 is subtracted from the output value of the atmospheric pressure sensor 40 to calculate a learned value. Then, this learning value is added to the output value of the high-pressure sensor 30 to calculate a correction value.

Referring to FIGS. 1 and 2, a method for measuring a pressure of a high-pressure fuel pump according to an embodiment of the present invention includes a first step S10 for detecting whether the engine 1 is stopped, A second step S20 of judging whether or not the engine 1 is in a state where the engine 1 is stopped after the vehicle has been produced, A fourth step S40 of detecting whether the low-pressure fuel pump 2 is in operation, a fifth step S50 of calculating a learning value, and a step of calculating a learning value, Step 6 (S60).

First, in the first step S10, the controller (not shown) of an electronic control unit (ECU) 10 detects whether the engine 1 is stopped. Since the reliable comparison data can not be obtained when the engine 1 is in operation, the method of measuring the pressure of the high-pressure fuel pump according to the embodiment of the present invention is completed.

When the engine 1 is stopped, the second step S20 is performed. At this time, it is determined whether or not the electronic control unit 10 is in the EOL state by using the information of the electronic control unit 10. When the vehicle is in the EOL state, the same pressure (1.013 bar = 1 atm) is applied to the atmospheric pressure sensor 40, the low-pressure sensor 20, and the high-pressure sensor 30 since no fuel is injected into the vehicle.

If the vehicle is not in the EOL state, it is detected whether the engine 1 is stopped over a predetermined time using information recorded in the electronic control unit 10 (third step S30). The high pressure fuel pump 3 is no longer operated and the temperature and pressure in the high pressure fuel pump 3 are also lowered so that the high pressure fuel pump 3 30 and the pressure applied to the atmospheric pressure sensor 40 become equal to each other.

In the case where the engine 1 is stopped in the EOL state in the second step S20 or in the third step S30 after exceeding the predetermined time, the fourth step S40 and the fifth step S50). When the low-pressure fuel pump 2 is operating in the fourth step S40, the output value of the low-pressure sensor 20 is output when the low-pressure sensor 30 measures the fuel pressure of the low-pressure fuel pump 2 When the fuel pressure of the high-pressure fuel pump 3 is measured by the high-pressure sensor 30, the output value of the high-pressure sensor 30 is output (S51). At this time, the learning value is calculated by subtracting the output value of the high-pressure sensor 30 from the output value of the low-pressure sensor 20 (S52).

On the other hand, when the low-pressure fuel pump 2 is stopped, an output value of the atmospheric pressure sensor 40 is output when the atmospheric pressure sensor 40 measures the atmospheric pressure at a place where the vehicle is placed, When the pressure is measured by the high-pressure sensor 30, the output value of the high-pressure sensor 30 is output (S51-1). At this time, the output value of the high-pressure sensor 30 is subtracted from the output value of the atmospheric pressure sensor 40 to calculate a learned value (S52-1).

Pressure fuel pump 2 is in operation while the engine 1 is stopped (the high-pressure fuel pump 3 is stopped), the pressure applied to the low-pressure sensor 20 and the pressure of the high- (30) are the same. Therefore, the difference between the output value output from the low-pressure sensor 20 and the output value output from the high-pressure sensor 30 becomes an error. In this case, the low pressure sensor 20 has a margin of error of ± 0.1 bar, which is considerably less than the error range (± 4.5 bar) of the high pressure sensor 30. Therefore, a value obtained by subtracting the output value of the high-pressure sensor 30 from the output value of the low-pressure sensor 20 having high reliability is used as a learning value.

On the other hand, when the low-pressure fuel pump 2 is stopped while the engine 1 is stopped in the EOL state or exceeding the preset time, the pressure applied to the high-pressure sensor 30 and the pressure applied to the atmospheric pressure sensor 40 The difference between the output value output from the atmospheric pressure sensor 40 and the output value output from the high pressure sensor 30 becomes an error. At this time, since the range of the error of the atmospheric pressure sensor 40 is ± 0.02 bar, it is considerably less than the error range (± 4.5 bar) of the high pressure sensor 30. Therefore, a value obtained by subtracting the output value of the high-pressure sensor 30 from the output value of the atmospheric-pressure sensor 40 having high reliability is used as a learning value.

In the sixth step S60, the learning value obtained in the fifth step S50 is added to the output value output from the high-pressure sensor 30 to calculate a correction value. That is, the output value of the high-pressure sensor 30 is changed to the output value of the low-pressure sensor 20 or the output value of the atmospheric pressure sensor 40 having a small error.

3 to 5, it is possible to compare the error ranges before and after the correction obtained by performing the pressure measurement method of the high-pressure fuel pump according to the embodiment of the present invention.

Referring to FIG. 3, the error of the high-pressure sensor 30 is 1% of the maximum measured pressure on the basis of 0 bar and increases in proportion to the pressure applied to the high-pressure fuel pump 3. For example, the error of the high pressure sensor 30 before correction is ± 4.5 bar at 0 bar condition and ± 8.1 bar at 450 bar condition.

4, when the low-pressure fuel pump 2 is in operation in the fourth step S40, the output value of the low-pressure sensor 20 having an error of ± 0.1 bar under the condition of 6 bar is used as a reference . Therefore, the error of the high-pressure sensor 30 after the correction is ± 3.7 bar at 450 bar.

5, when the low-pressure fuel pump 2 is stopped in the fourth step S40, the output value of the atmospheric pressure sensor 40 having an error of 0.02 bar at 1 bar is used as a reference . Therefore, the error of the high-pressure sensor 30 after the correction is ± 3.62 bar at 450 bar.

That is, the measurement error of the high-pressure sensor 30 is reduced by about 54% through the method of measuring the pressure of the high-pressure fuel pump according to the embodiment of the present invention.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is obvious that the modification or the modification is possible by the person.

 It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

1: engine
2: Low pressure fuel pump
3: High pressure fuel pump
10: Electronic control device
20: Low pressure sensor
30: High pressure sensor
40: Atmospheric pressure sensor
S10: Step 1
S20: Step 2
S30: Step 3
S40: Step 4
S50: Step 5
S60: Step 6

Claims (5)

A first step of detecting whether the engine is stopped or not;
A second step of determining whether the engine is in an end of line (EOL) state using the information of the electronic control unit when the engine is stopped in the first step;
A third step of determining whether the time when the engine is continuously stopped is longer than a preset time period when the engine is not in the EOL state in the second step;
A fourth step of detecting whether the low pressure fuel pump is in operation when the time for which the engine is continuously stopped in the third step exceeds a predetermined time;
Pressure fuel pump is in operation, the output value of the high-pressure sensor for measuring the fuel pressure of the high-pressure fuel pump is subtracted from the output value of the low-pressure sensor for measuring the fuel pressure of the low-pressure fuel pump to calculate a learning value Step 5; And
A sixth step of correcting the output value of the high-pressure sensor using the learning value calculated in the fifth step;
Pressure fuel pump.
The method according to claim 1,
And the fourth step is performed when the EOL state is established in the second step.
3. The method of claim 2,
Pressure fuel pump is stopped, the output value of the high-pressure sensor is subtracted from the output value of the atmospheric pressure sensor for measuring the atmospheric pressure at a place where the vehicle is placed, How to measure.
The method according to claim 2 or 3,
In the sixth step,
And the learning value is added to the output value of the high-pressure sensor to calculate a correction value.
An atmospheric pressure sensor for measuring an atmospheric pressure at a place where the vehicle is placed;
A low pressure sensor for measuring the fuel pressure of the low pressure fuel pump;
A high-pressure sensor for measuring the fuel pressure of the high-pressure fuel pump; And
A controller for comparing the output value of the atmospheric pressure sensor or the output value of the low pressure sensor with the output value of the high pressure sensor to calculate a learned value and correcting the output value of the high pressure sensor through the learned value when the engine is stopped;
Pressure fuel pump.
KR1020150180439A 2015-12-16 2015-12-16 Method and appartus for measuring pressure of high-pressure fuel pump KR20170072061A (en)

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Application Number Priority Date Filing Date Title
KR1020150180439A KR20170072061A (en) 2015-12-16 2015-12-16 Method and appartus for measuring pressure of high-pressure fuel pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150180439A KR20170072061A (en) 2015-12-16 2015-12-16 Method and appartus for measuring pressure of high-pressure fuel pump

Publications (1)

Publication Number Publication Date
KR20170072061A true KR20170072061A (en) 2017-06-26

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Country Status (1)

Country Link
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