KR101559188B1 - a feul pressure sensor error detection method for a GDI Vehicle - Google Patents
a feul pressure sensor error detection method for a GDI Vehicle Download PDFInfo
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- KR101559188B1 KR101559188B1 KR1020100104773A KR20100104773A KR101559188B1 KR 101559188 B1 KR101559188 B1 KR 101559188B1 KR 1020100104773 A KR1020100104773 A KR 1020100104773A KR 20100104773 A KR20100104773 A KR 20100104773A KR 101559188 B1 KR101559188 B1 KR 101559188B1
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- 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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Abstract
The present invention relates to a method of diagnosing a fuel pressure sensor of a GDI vehicle equipped with a GDI engine,
Conventionally, since it is determined whether the power of the battery is inputted to the fuel pressure sensor and the ground of the fuel pressure sensor is inputted, it is determined that the battery power is simply connected. Therefore, It is impossible to judge the case of recognizing the pressure lower than the actual pressure and it is impossible to judge the case of recognizing the specific pressure regardless of the actual fuel pressure.
Confirming whether the monitoring condition is valid; Setting the fuel pressure sensor monitoring time if the monitoring condition is satisfied; Checking whether the PI-Control value is abnormally high compared to the normal fuel pressure sensor or whether the PI-Control value is abnormally low compared to the normal fuel pressure sensor; If the PI-Control value is abnormally high compared to the normal fuel pressure sensor or if the PI-Control value is abnormally low compared to the normal fuel pressure sensor, the PI-Control value is changed to the maximum dress hold (PI_Control Max (T_SUM_MAX) or the time when the PI-Control value exceeds the PI_Control Min Value (T_SUM_MIN) during the time of monitoring the fuel pressure sensor (T_SUM_MIN), and setting the T_SUM_MAX value to the dress hold or T_SUM_MIN Setting a dress-hold value; Confirming that the fuel pressure sensor monitoring time is greater than the dress hold; If the fuel pressure sensor monitoring time is greater than the dress hold, checking whether the accumulated T_SUM_MAX value within the time of monitoring the fuel pressure sensor exceeds the dresshold or the accumulated T_SUM_MIN value within the time of monitoring the fuel pressure sensor exceeds the dresshold: Determining whether the T_SUM_MAX value accumulated within the time for monitoring the fuel pressure sensor exceeds the dresshold or the T_SUM_MIN value accumulated within the time for monitoring the fuel pressure sensor exceeds the dress hold, and According to the present invention, it is possible to determine a failure in the case where the pressure is recognized to be higher or lower than the actual fuel pressure in the GDI vehicle than the fuel pressure sensor, and in the case where the fuel pressure is fixed to a specific value regardless of the target fuel pressure, It is possible to improve the maintainability of the vehicle .
Description
The present invention relates to a method for diagnosing a fuel pressure sensor of a GDI vehicle equipped with a GDI engine and more particularly to a method of diagnosing a fuel pressure sensor of a GDI vehicle equipped with a GDI engine, So that a failure can be judged when it is fixed to a specific value.
The gasoline direct injection engine (GDI) is a fully combustible engine with a mixer ratio leaner than the lean-burn engine by directly injecting gasoline into a cylinder filled with air
Generally, in a GDI engine system, a high-pressure pump and a high-pressure injector are used for high-pressure injection, and a high-pressure pump used for forming a high pressure further includes a cam- And the piston of the high-pressure pump compresses / expands in accordance with the rotation of the camshaft to form a pressure on the fuel rail, thereby obtaining a pressure required for injection.
In the GDI engine system, it is necessary to know the pressure of the fuel rail to drive the fuel pump to inject the required amount of fuel into the injector. If the pressure of the fuel rail is not accurately known, The signal is distorted and causes a serious problem to the vehicle.
Therefore, it is important to accurately recognize the pressure of the fuel rail in the GDI engine system, and as a result, the diagnosis of the fuel pressure sensor is an important task in the GDI engine.
In the past, however, the diagnosis of the fuel pressure sensor was very simple and only judged the wire short circuit.
That is, conventionally, it is determined whether the power of the battery is inputted to the fuel pressure sensor and the ground of the fuel pressure sensor is inputted, and it is judged whether or not the battery power is simply connected.
Therefore, it is impossible to judge the case where the pressure is recognized to be lower than the actual pressure or to recognize the pressure higher than the actual pressure due to the failure of the fuel pressure sensor. In addition, There was a problem.
SUMMARY OF THE INVENTION It is an object of the present invention to provide a GDI engine equipped with a GDI engine and a fuel pressure sensor that recognize a higher or lower pressure than an actual fuel pressure, The present invention provides a method for diagnosing a fuel pressure sensor of a GDI vehicle, which makes it possible to determine a failure when the fuel pressure is fixed to a specific value regardless of a fuel pressure.
According to another aspect of the present invention, there is provided a method for diagnosing a fuel pressure sensor of a GDI vehicle, Setting the fuel pressure sensor monitoring time if the monitoring condition is satisfied; Checking whether the PI-Control value is abnormally high compared to the normal fuel pressure sensor or whether the PI-Control value is abnormally low compared to the normal fuel pressure sensor; If the PI-Control value is abnormally high compared to the normal fuel pressure sensor or if the PI-Control value is abnormally low compared to the normal fuel pressure sensor, the PI-Control value is changed to the maximum dress hold (PI_Control Max (T_SUM_MAX) or the time when the PI-Control value exceeds the PI_Control Min Value (T_SUM_MIN) during the time of monitoring the fuel pressure sensor (T_SUM_MIN), and set the T_SUM_MAX value to the dress hold or T_SUM_MIN Setting a dress-hold value; Confirming that the fuel pressure sensor monitoring time is greater than the dress hold; If the fuel pressure sensor monitoring time is greater than the dress hold, checking whether the accumulated T_SUM_MAX value within the time of monitoring the fuel pressure sensor exceeds the dresshold or the accumulated T_SUM_MIN value within the time of monitoring the fuel pressure sensor exceeds the dresshold: Determining a failure if the T_SUM_MAX value accumulated within the time for monitoring the fuel pressure sensor exceeds the dress hold or the T_SUM_MIN value accumulated within the time for monitoring the fuel pressure sensor exceeds the dress hold value.
In addition, the method for diagnosing a fuel pressure sensor of a GDI vehicle according to the present invention includes: confirming whether a monitoring condition is applied; Setting the fuel pressure sensor monitoring time if the monitoring condition is satisfied; Confirming whether the fuel pressure sensor value (FUP) is unchanged; Measuring the time (T_SUM_FUP) of the fuel pressure sensor value (FUP) during the time for monitoring the fuel pressure sensor when the fuel pressure sensor value (FUP) does not fluctuate (T_SUM_FUP) and setting the T_SUM_FUP value to the dress hold; Confirming that the fuel pressure sensor monitoring time is greater than the dress hold; If the fuel pressure sensor monitoring time is greater than the dress hold, check that the accumulated T_SUM_FUP value within the time of monitoring the fuel pressure sensor exceeds the dress hold: If the accumulated T_SUM_FUP value within the time of monitoring the fuel pressure sensor exceeds the dress hold, And a step of judging whether or not there is an abnormality.
According to the present invention, it is possible to determine a failure in the case of recognizing the pressure higher or lower than the actual fuel pressure in the GDI vehicle than the fuel pressure sensor and when the fuel pressure is fixed to a specific value regardless of the target fuel pressure It is possible to greatly improve the maintenance performance of the vehicle.
Fig. 1 is a flowchart of the diagnosis when the fuel pressure of the present invention is recognized as being lower or higher than the actual fuel pressure
Fig. 2 is a flowchart of the diagnosis when the fuel pressure of the present invention is fixed to a specific value regardless of the target fuel pressure. Fig.
3 shows the fuel pressure sensor signal graph
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.
FIG. 1 shows a diagnostic flow chart when the fuel pressure of the present invention is recognized as being lower or higher than the actual fuel pressure.
1, the method of diagnosing a fuel pressure sensor of a GDI vehicle according to the present invention
Confirming whether the monitoring condition is valid;
Setting the fuel pressure sensor monitoring time if the monitoring condition is satisfied;
Checking whether the PI-Control value is abnormally high compared to the normal fuel pressure sensor or whether the PI-Control value is abnormally low compared to the normal fuel pressure sensor;
If the PI-Control value is abnormally high compared to the normal fuel pressure sensor or if the PI-Control value is abnormally low compared to the normal fuel pressure sensor, the PI-Control value is changed to the maximum dress hold (PI_Control Max (T_SUM_MAX) or the time when the PI-Control value exceeds the PI_Control Min Value (T_SUM_MIN) during the time of monitoring the fuel pressure sensor (T_SUM_MIN), and set the T_SUM_MAX value to the dress hold or T_SUM_MIN Setting a dress-hold value;
Confirming that the fuel pressure sensor monitoring time is greater than the dress hold;
If the fuel pressure sensor monitoring time is greater than the dress hold, checking whether the accumulated T_SUM_MAX value within the time of monitoring the fuel pressure sensor exceeds the dresshold or the accumulated T_SUM_MIN value within the time of monitoring the fuel pressure sensor exceeds the dresshold:
Determining a failure if the T_SUM_MAX value accumulated within the time for monitoring the fuel pressure sensor exceeds the dress hold or the T_SUM_MIN value accumulated within the time for monitoring the fuel pressure sensor exceeds the dress hold value.
If the PI control value does not appear abnormally higher than the normal fuel pressure sensor or if the PI control value does not appear abnormally lower than the normal fuel pressure sensor, it is confirmed that the fuel pressure sensor monitoring time is larger than the dress hold.
If the T_SUM_MAX value accumulated within the time for monitoring the fuel pressure sensor does not exceed the dress hold or the T_SUM_MIN value accumulated within the time for monitoring the fuel pressure sensor is lower than the dress hold time, If it does not exceed the hold, reset all time counters and return to the beginning.
On the other hand, FIG. 2 shows a diagnostic flow chart when the fuel pressure of the present invention is fixed to a specific value regardless of the target fuel pressure.
As shown in FIG. 2, the fuel pressure sensor diagnosis method of the GDI vehicle of the present invention
Confirming whether the monitoring condition is valid;
Setting the fuel pressure sensor monitoring time if the monitoring condition is satisfied;
Confirming whether the fuel pressure sensor value (FUP) is unchanged;
Measuring the time (T_SUM_FUP) of the fuel pressure sensor value (FUP) during the time for monitoring the fuel pressure sensor when the fuel pressure sensor value (FUP) does not fluctuate (T_SUM_FUP) and setting the T_SUM_FUP value to the dress hold;
Confirming that the fuel pressure sensor monitoring time is greater than the dress hold;
If the fuel pressure sensor monitoring time is greater than the dress hold, checking that the accumulated T_SUM_FUP value within the time of monitoring the fuel pressure sensor exceeds the dress hold:
And a step of determining a failure if a value of T_SUM_FUP accumulated within the time for monitoring the fuel pressure sensor exceeds a dress hold.
If the fuel pressure sensor value (FUP) fluctuates above, it is confirmed that the fuel pressure sensor monitoring time is larger than the dresshold.
If the fuel pressure sensor monitoring time is not greater than the dress hold, it returns to the initial value. If the accumulated T_SUM_FUP value does not exceed the dress hold time within the monitoring time of the fuel pressure sensor, all time counters are reset and returned to the initial state.
In the method for diagnosing the fuel pressure sensor of the GDI vehicle according to the present invention, a pre-control value is calculated through a corresponding table value preset according to the required fuel amount, the RPM, and the target pressure.
The P-Control value is determined by the target pressure, the current pressure difference, and the factor according to the RPM, and the I-control value is determined by the factor corresponding to the target pressure, the current pressure difference, and the RPM.
The PI_Control value is [P-Control value] + [I-Control value], and the final high-pressure fuel pump control value is Pre_Control value + PI_Control value.
In the method for diagnosing the fuel pressure sensor of the GDI vehicle according to the present invention, when the pressure is recognized to be lower than the actual fuel pressure due to the fuel pressure sensor abnormality, the pre-control value of the fuel is not changed because it is determined by the table value.
If the actual fuel pressure reaches the target fuel pressure but the fuel pressure is lower than the target fuel pressure due to the fuel pressure sensor abnormality, the PI-Control value is abnormally higher than the normal fuel pressure sensor in order to increase the pressure further.
In this case, the PI_Control Max value of the PI-Control value is set, the monitoring time counter is set to monitor the fuel pressure sensor, and the PI-Control value is set to the maximum dress hold (T_SUM_MAX) exceeding the PI_Control Max Value, and if the T_SUM_MAX value accumulated within the time for monitoring the fuel pressure sensor after setting the T_SUM_MAX value to the dress hold exceeds the dress hold, it is determined that the failure has occurred.
In the method for diagnosing the fuel pressure sensor of the GDI vehicle according to the present invention, even when the pressure is higher than the actual fuel pressure due to the fuel pressure sensor abnormality, the fuel pre-control value is determined by the table value.
If the actual fuel pressure reaches the target fuel pressure and the fuel pressure is higher than the target fuel pressure due to the pressure sensor abnormality, the PI control value is abnormally lower than the normal fuel pressure sensor in order to lower the pressure.
At this time, PI-Control Min Value is set to the minimum value of PI-Control value, Monitoring Time Counter is set to monitor the fuel pressure sensor, and PI-Control value is set to Minimum Dress Hold (T_SUM_MIN) exceeding the PI_Control Min Value, and if the T_SUM_MIN value accumulated within the time for monitoring the fuel pressure sensor after setting the T_SUM_MIN value in the dress hold exceeds the dress hold, the trouble is judged.
On the other hand, when the fuel pressure is fixed to a specific value regardless of the target fuel pressure due to the fuel pressure sensor, recognizing the specific pressure means that the signal from the fuel pressure sensor is constant.
However, since the fuel pressure is obtained by the pump, a small oscillation must occur, the fuel pressure must be changed by changing the operating conditions, but if not, the fuel pressure sensor failure is determined.
A fuel pressure sensor signal graph is shown in Fig.
As shown in FIG. 3, when the signal from the fuel pressure sensor is constant, the fuel pressure appears to be constant rather than the oscillation (straight line).
In this case, the failure is judged if it continues at a certain pressure value without change of pressure over a certain time / range.
That is, the monitoring time counter for monitoring the fuel pressure sensor, the time (T_SUM_FUP) for the fuel pressure sensor value (FUP) during the time for monitoring the fuel pressure sensor (T_SUM_FUP), and the T_SUM_FUP value If the T_SUM_FUP value accumulated within the time for monitoring the post fuel pressure sensor exceeds the dress hold, it is judged that the failure has occurred.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined by the appended claims. .
Claims (8)
Setting the fuel pressure sensor monitoring time if the monitoring condition is satisfied;
Checking whether the PI-Control value is abnormally high compared to the normal fuel pressure sensor or whether the PI-Control value is abnormally low compared to the normal fuel pressure sensor;
If the PI-Control value is abnormally high compared to the normal fuel pressure sensor or if the PI-Control value is abnormally low compared to the normal fuel pressure sensor, the PI-Control value is changed to the maximum dress hold (PI_Control Max (T_SUM_MAX) or the time when the PI-Control value exceeds the PI_Control Min Value (T_SUM_MIN) during the time of monitoring the fuel pressure sensor (T_SUM_MIN), and setting the T_SUM_MAX value to the dress hold or T_SUM_MIN Setting a dress-hold value;
Confirming that the fuel pressure sensor monitoring time is greater than the dress hold;
If the fuel pressure sensor monitoring time is greater than the dress hold, checking whether the accumulated T_SUM_MAX value within the time of monitoring the fuel pressure sensor exceeds the dresshold or the accumulated T_SUM_MIN value within the time of monitoring the fuel pressure sensor exceeds the dresshold:
Judging a failure if a T_SUM_MAX value accumulated within a time period for monitoring the fuel pressure sensor exceeds a dress hold or a T_SUM_MIN value accumulated within a time period for monitoring the fuel pressure sensor exceeds a dress hold value; Fuel pressure sensor diagnostic method.
Setting the fuel pressure sensor monitoring time if the monitoring condition is satisfied;
Confirming whether the fuel pressure sensor value (FUP) is unchanged;
Measuring the time (T_SUM_FUP) of the fuel pressure sensor value (FUP) during the time for monitoring the fuel pressure sensor when the fuel pressure sensor value (FUP) does not fluctuate (T_SUM_FUP) and setting the T_SUM_FUP value to the dress hold;
Confirming that the fuel pressure sensor monitoring time is greater than the dress hold;
If the fuel pressure sensor monitoring time is greater than the dress hold, checking that the accumulated T_SUM_FUP value within the time of monitoring the fuel pressure sensor exceeds the dress hold:
And determining a failure if a T_SUM_FUP value accumulated within a time period for monitoring the fuel pressure sensor exceeds a dress hold value.
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020100104773A KR101559188B1 (en) | 2010-10-26 | 2010-10-26 | a feul pressure sensor error detection method for a GDI Vehicle |
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| KR1020100104773A KR101559188B1 (en) | 2010-10-26 | 2010-10-26 | a feul pressure sensor error detection method for a GDI Vehicle |
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| KR20120043457A KR20120043457A (en) | 2012-05-04 |
| KR101559188B1 true KR101559188B1 (en) | 2015-10-12 |
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| KR101491286B1 (en) * | 2013-07-26 | 2015-02-06 | 현대자동차주식회사 | Control method for learning deviation of fuel pressure sensor for vehicle |
| KR101593431B1 (en) * | 2014-08-01 | 2016-02-19 | 현대오트론 주식회사 | Method for detecting stuck of fuel high pressure sensor in gdi vehicle |
| GB2543473A (en) * | 2015-06-03 | 2017-04-26 | Gm Global Tech Operations Llc | Method of diagnosing a fuel rail pressure sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100369137B1 (en) * | 1999-12-30 | 2003-01-24 | 현대자동차주식회사 | Rail pressure sensor self check method for common rail diesel engine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100369137B1 (en) * | 1999-12-30 | 2003-01-24 | 현대자동차주식회사 | Rail pressure sensor self check method for common rail diesel engine |
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