CN114607533B - Freezing diagnosis processing method of EGR differential pressure sensor - Google Patents
Freezing diagnosis processing method of EGR differential pressure sensor Download PDFInfo
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- CN114607533B CN114607533B CN202210392164.8A CN202210392164A CN114607533B CN 114607533 B CN114607533 B CN 114607533B CN 202210392164 A CN202210392164 A CN 202210392164A CN 114607533 B CN114607533 B CN 114607533B
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- 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
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/49—Detecting, diagnosing or indicating an abnormal function of the EGR system
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- 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
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/45—Sensors specially adapted for EGR systems
- F02M26/46—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition
- F02M26/47—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition the characteristics being temperatures, pressures or flow rates
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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)
- Fluid Mechanics (AREA)
- Analytical Chemistry (AREA)
- Exhaust-Gas Circulating Devices (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention relates to the technical field of electronic control of automobile engines, in particular to an icing diagnosis processing method of an EGR differential pressure sensor, which comprises the following steps: first, a diagnostic mode is entered, which includes: acquiring a cooling liquid temperature T1 and an ambient temperature T2; judging whether the temperature T1 of the cooling liquid is less than or equal to T01 or whether the temperature T2 of the environment is less than or equal to T02, wherein T01 is a first temperature threshold value and T02 is a second temperature threshold value; if the temperature T1 of the cooling liquid is less than or equal to T01 or the temperature T2 of the environment is less than or equal to T02, the physical value delta P of the EGR differential pressure sensor is obtained; judging whether the physical value delta P of the EGR differential pressure sensor meets delta P & gtdelta P01 or not, wherein delta P01 is a first physical value threshold; if the physical value DeltaP > DeltaP 01 of the EGR differential pressure sensor, an icing warning signal is output and enters an ice-melting mode. The freezing diagnosis processing method of the EGR differential pressure sensor provides accurate freezing diagnosis steps, and can ensure the safety of vehicle use.
Description
Technical Field
The invention relates to the technical field of electronic control of automobile engines, in particular to an icing diagnosis processing method of an EGR differential pressure sensor.
Background
An EGR (Exhaust Gas recirculation) control system includes: an EGR valve, an EGR differential pressure sensor, and an intake pressure temperature sensor. The fresh air inflow is calculated by subtracting the EGR exhaust gas amount from the total air inflow, the total air inflow is calculated by measuring through an air inflow pressure temperature sensor, and the EGR exhaust gas amount is calculated by measuring through an EGR differential pressure sensor. Therefore, measurement accuracy of the EGR differential pressure sensor is critical. The phenomenon that an EGR differential pressure sensor in an air inlet path of a vehicle is frozen easily occurs in a alpine region, and finally the vehicle cannot be started normally. However, in the prior art, no accurate diagnosis and treatment method for icing of the EGR differential pressure sensor exists, so that whether the EGR differential pressure sensor is frozen or not is diagnosed and treated, and the risk of use safety of vehicles in alpine regions is caused.
Therefore, there is a need for an EGR differential pressure sensor icing diagnostic processing method that addresses the above-described issues.
Disclosure of Invention
The invention aims to provide an icing diagnosis processing method for an EGR differential pressure sensor, which can diagnose and process whether the EGR differential pressure sensor is iced or not so as to ensure the safety of vehicle use in alpine regions.
To achieve the purpose, the invention adopts the following technical scheme:
an icing diagnosis processing method of an EGR differential pressure sensor comprises the following steps:
entering a diagnostic mode, the diagnostic mode comprising the steps of:
acquiring a cooling liquid temperature T1 and an ambient temperature T2;
judging whether the temperature T1 of the cooling liquid is less than or equal to T01 or the temperature T2 of the environment is less than or equal to T02, wherein T01 is a first temperature threshold value and T02 is a second temperature threshold value;
if the temperature T1 of the cooling liquid is less than or equal to T01 or the temperature T2 of the environment is less than or equal to T02, the physical value delta P of the EGR differential pressure sensor is obtained;
judging whether the physical value delta P of the EGR differential pressure sensor meets delta P & gtdelta P01, wherein delta P01 is a first physical value threshold;
and outputting an icing warning signal and entering an ice melting mode if the physical value delta P of the EGR differential pressure sensor is larger than delta P01.
Optionally, when the ice melting mode is entered, a physical value preset value delta P1 is used as a substitute value of the physical value delta P of the EGR differential pressure sensor, so that normal running of the vehicle is ensured.
Optionally, the diagnostic mode further comprises:
and if the temperature T1 of the cooling liquid is more than T01 and the ambient temperature T2 is more than T02, outputting an ice-free signal, judging whether the physical value delta P of the EGR differential pressure sensor meets delta P more than delta P02, and if so, outputting a physical value exceeding an upper limit fault, wherein delta P02 is a second physical value threshold.
Optionally, the diagnostic mode further comprises:
when the temperature T1 of the cooling liquid is less than or equal to T01 or the temperature T2 of the environment is less than or equal to T02, if the physical value delta P of the EGR differential pressure sensor is less than or equal to delta P01, a non-icing fault-free signal is output.
Optionally, the ice melting mode includes the steps of:
judging whether the temperature T1 of the cooling liquid meets T1 & gtT 03, wherein T03 is a third temperature threshold;
if the temperature T1 of the cooling liquid is more than T03, opening an EGR valve opening A=A1, and further judging whether the voltage value V of the EGR pressure difference sensor meets V less than or equal to V0, wherein A1 is an opening preset value, and V0 is a voltage threshold.
Optionally, the ice melting mode further includes:
and when the opening A=A1 of the EGR valve and the voltage value V of the EGR pressure difference sensor is less than or equal to V0, timing is carried out, whether the duration t is more than or equal to t0 is judged, and if yes, an ice melting completion signal is output, wherein t0 is a duration threshold value.
Optionally, the physical value Δp of the EGR pressure difference sensor is not Δp1 any more, but is a real-time value while the ice melting completion signal is outputted.
Optionally, the diagnostic mode is entered while the ice melting completion signal is output.
Alternatively, t01=0 ℃, t02= -5 ℃, Δp01=10 KPa.
Alternatively, Δp1=5 KPa.
Alternatively, Δp02=30 KPa.
Alternatively, t03=40 ℃, a1=30 degrees, v0=1000 mv, t0=2 min.
The invention has the beneficial effects that:
the invention provides an icing diagnosis processing method of an EGR differential pressure sensor, which comprises the following steps: first, a diagnostic mode is entered, which includes: acquiring a cooling liquid temperature T1 and an ambient temperature T2; judging whether the temperature T1 of the cooling liquid is less than or equal to T01 or the temperature T2 of the environment is less than or equal to T02, wherein T01 is a first temperature threshold value and T02 is a second temperature threshold value; if the temperature T1 of the cooling liquid is less than or equal to T01 or the temperature T2 of the environment is less than or equal to T02, the physical value delta P of the EGR differential pressure sensor is obtained; judging whether the physical value delta P of the EGR differential pressure sensor meets delta P & gtdelta P01 or not, wherein delta P01 is a first physical value threshold value; if the physical value DeltaP > DeltaP 01 of the EGR differential pressure sensor, an icing warning signal is output and enters an ice-melting mode. The method for diagnosing and processing the icing of the EGR differential pressure sensor is based on the icing principle of the EGR differential pressure sensor, provides accurate icing diagnosis steps, can judge and discover in time when the EGR differential pressure sensor is frozen, and enters an ice melting mode for processing so as to ensure the safety of vehicle use in alpine regions.
Drawings
Fig. 1 is a schematic flow chart of an icing diagnosis processing method of an EGR differential pressure sensor according to an embodiment of the present invention.
Detailed Description
The technical scheme of the invention is further described below with reference to the attached drawings and the embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the drawings related to the present invention are shown.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixed or removable, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The phenomenon that an EGR differential pressure sensor in an air inlet path of a vehicle is frozen easily occurs in a alpine region, and finally the vehicle cannot be started normally. However, in the prior art, an accurate diagnosis and treatment method for icing of the EGR differential pressure sensor does not exist, so that whether the EGR differential pressure sensor is frozen or not is diagnosed and treated, and the risk of use safety of vehicles in alpine regions is caused.
Accordingly, the present embodiment provides an EGR differential pressure sensor icing diagnosis processing method to solve the above-described problems. As shown in fig. 1, the method for diagnosing ice formation of the EGR pressure difference sensor includes the steps of:
after the vehicle is started initially, the engine controller enters a diagnosis mode to diagnose whether the EGR differential pressure sensor is frozen or not. The diagnostic mode includes the steps of:
first, the engine controller controls the coolant temperature sensor to measure the coolant temperature T1, and controls the atmospheric temperature sensor to measure the ambient temperature T2. The engine controller judges whether the temperature T1 of the cooling liquid is less than or equal to T01 or the ambient temperature T2 is less than or equal to T02, wherein T01 is a first temperature threshold value and T02 is a second temperature threshold value. If the temperature T1 of the cooling liquid is less than or equal to T01 or the ambient temperature T2 is less than or equal to T02, the EGR pressure difference sensor has the icing risk. Optionally, the first temperature threshold t01=0 ℃, and the second temperature threshold t02= -5 ℃. Experiments prove that the value can accurately judge whether the EGR differential pressure sensor has icing risk.
When the EGR differential pressure sensor has the icing risk, the engine controller further acquires the voltage value of the EGR differential pressure sensor and converts the voltage value into the physical value delta P of the EGR differential pressure sensor.
The engine controller further determines whether the EGR differential pressure sensor physical value ΔP satisfies ΔP > ΔP01, where ΔP01 is a first physical value threshold. Alternatively, Δp01=10kpa. If the physical value DeltaP > DeltaP 01 of the EGR differential pressure sensor, an icing warning signal is output and enters an ice-melting mode. And if the physical value delta P of the EGR differential pressure sensor is less than or equal to delta P01, outputting an ice-free fault-free signal.
Optionally, when the ice melting mode is entered, the physical value preset value delta P1 is used as a substitute value of the physical value delta P of the EGR differential pressure sensor, so that the normal running of the vehicle is ensured. Alternatively, Δp1=5 KPa.
If the temperature T1 of the cooling liquid is more than T01 and the ambient temperature T2 is more than T02, outputting an ice-free signal, and judging whether the physical value delta P of the EGR differential pressure sensor meets delta P & gtdelta P02, wherein delta P02 is a second physical value threshold. If the EGR differential pressure sensor physical value ΔP > ΔP02, then the output physical value exceeds an upper limit fault. And if the physical value delta P of the EGR differential pressure sensor is less than or equal to delta P02, outputting an ice-free fault-free signal. Alternatively, Δp02=30 KPa.
The ice melting mode comprises the following steps:
first, the engine controller determines whether the coolant temperature T1 satisfies T1 > T03, where T03 is a third temperature threshold. If the coolant temperature T1 > T03, the engine controller controls the EGR valve to open the EGR valve by an opening A=A1, wherein A1 is an opening preset value to melt ice of the EGR differential pressure sensor by using hot exhaust gas of the engine. Alternatively, the third temperature threshold value t03=40 ℃, and the opening preset value a1=30 degrees.
Of course, in other embodiments, T03 and A1 may be further refined, so that the coolant temperature corresponds to different EGR valve openings in different temperature ranges, so as to ensure that the melting of ice can be completed as soon as possible while the emission requirement is met, and reduce the endless energy loss.
The engine controller further judges whether the voltage value V of the EGR differential pressure sensor meets V less than or equal to V0, wherein V0 is a voltage threshold value. Optionally, the voltage threshold v0=1000 mv.
And when the opening A=A1 of the EGR valve and the voltage value V of the EGR differential pressure sensor are less than or equal to V0, timing is carried out, and whether the duration t meets t is more than or equal to t0 is judged, wherein t0 is a duration threshold value. And when V is less than or equal to V0 and t is more than or equal to t0, outputting an ice melting completion signal, namely, the voltage value V of the EGR differential pressure sensor is less than or equal to V0 for a period of time t0, namely, the ice melting is considered to be completed, and the EGR differential pressure sensor has no icing risk. Alternatively, t0=2 min. Experiments prove that when the voltage value V of the EGR pressure difference sensor is lower than or equal to 1000mv and is kept for 2min, the EGR pressure difference sensor has completed ice melting.
Practice shows that the icing of the EGR differential pressure sensor can cause the excessive pressure difference measurement value, and the EGR differential pressure sensor can be normally used after ice melting without influencing the testing accuracy of the EGR differential pressure sensor. Therefore, the physical value Δp of the EGR pressure difference sensor is not used Δp1 any more, but is taken in real time while the ice-melting completion signal is outputted.
Optionally, the engine controller enters a diagnostic mode to monitor and diagnose whether the EGR pressure difference sensor is refreezing while outputting the ice melting completion signal. In other embodiments, of course, the diagnosis and treatment of ice may be performed only at the initial stage of vehicle start, and when it is determined that there is no ice, or after ice melting is completed, no diagnosis is performed until the next start of the vehicle.
It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (10)
1. An icing diagnosis processing method of an EGR differential pressure sensor is characterized by comprising the following steps:
entering a diagnostic mode, the diagnostic mode comprising the steps of:
acquiring a cooling liquid temperature T1 and an ambient temperature T2;
judging whether the temperature T1 of the cooling liquid is less than or equal to T01 or the temperature T2 of the environment is less than or equal to T02, wherein T01 is a first temperature threshold value and T02 is a second temperature threshold value;
if the temperature T1 of the cooling liquid is less than or equal to T01 or the temperature T2 of the environment is less than or equal to T02, the physical value delta P of the EGR differential pressure sensor is obtained;
judging whether the physical value delta P of the EGR differential pressure sensor meets delta P & gtdelta P01, wherein delta P01 is a first physical value threshold;
if the physical value delta P of the EGR pressure difference sensor is larger than delta P01, outputting an icing warning signal, entering an ice melting mode, and taking a physical value preset value delta P1 as a substitute value of the physical value delta P of the EGR pressure difference sensor when entering the ice melting mode so as to ensure that the vehicle runs normally;
the ice melting mode comprises the following steps:
judging whether the temperature T1 of the cooling liquid meets T1 & gtT 03, wherein T03 is a third temperature threshold;
if the temperature T1 of the cooling liquid is more than T03, opening an EGR valve opening A=A1, and further judging whether the voltage value V of the EGR pressure difference sensor meets V less than or equal to V0, wherein A1 is an opening preset value, and V0 is a voltage threshold.
2. The EGR pressure difference sensor icing diagnostic processing method according to claim 1, characterized in that said diagnostic mode further includes:
and if the temperature T1 of the cooling liquid is more than T01 and the ambient temperature T2 is more than T02, outputting an ice-free signal, judging whether the physical value delta P of the EGR differential pressure sensor meets delta P more than delta P02, and if so, outputting a physical value exceeding an upper limit fault, wherein delta P02 is a second physical value threshold.
3. The EGR pressure difference sensor icing diagnostic processing method according to claim 1, characterized in that said diagnostic mode further includes:
when the temperature T1 of the cooling liquid is less than or equal to T01 or the temperature T2 of the environment is less than or equal to T02, if the physical value delta P of the EGR differential pressure sensor is less than or equal to delta P01, a non-icing fault-free signal is output.
4. The EGR pressure difference sensor icing diagnostic processing method according to claim 1, characterized in that said ice-melt mode further includes:
and when the opening A=A1 of the EGR valve and the voltage value V of the EGR pressure difference sensor is less than or equal to V0, timing is carried out, whether the duration t is more than or equal to t0 is judged, and if yes, an ice melting completion signal is output, wherein t0 is a duration threshold value.
5. The EGR pressure difference sensor icing diagnosis process according to claim 4, characterized in that the EGR pressure difference sensor physical value Δp is not used any more Δp1 but is taken in real time while the ice melting completion signal is outputted.
6. The EGR pressure difference sensor icing diagnostic processing method according to claim 4, characterized in that the diagnostic mode is entered while the ice-melting completion signal is outputted.
7. The EGR pressure difference sensor icing diagnosis process method according to claim 1, characterized in that t01=0 ℃, t02= -5 ℃, Δp01=10 KPa.
8. The EGR pressure difference sensor icing diagnosis process method according to claim 1, characterized in that Δp1=5 KPa.
9. The EGR pressure difference sensor icing diagnosis process method according to claim 2, characterized in that Δp02=30 KPa.
10. The EGR pressure difference sensor icing diagnostic processing method according to claim 4, characterized in that t03=40 ℃, a1=30 degrees, v0=1000 mv, t0=2 min.
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| CN116146367A (en) * | 2022-12-20 | 2023-05-23 | 联合汽车电子有限公司 | Method for eliminating misjudgment risk of icing of engine exhaust back pressure sensor, electronic equipment and vehicle |
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| US5349936A (en) * | 1992-08-05 | 1994-09-27 | Mitsubishi Denki Kabushiki Kaisha | Method of diagnosing exhaust gas recirculation control system of internal combustion engine and apparatus for carrying out the same |
| CN205719385U (en) * | 2016-03-30 | 2016-11-23 | 广州市设计院 | Air cleaner pressure test device with remote transmission function |
| CN110132381A (en) * | 2019-06-29 | 2019-08-16 | 潍柴动力股份有限公司 | Venturi differential pressure pickup credibility diagnostic method and device |
| CN110487481A (en) * | 2019-09-25 | 2019-11-22 | 潍柴动力股份有限公司 | Venturi meter differential pressure pickup monitoring method and device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE202015003616U1 (en) * | 2015-05-19 | 2016-08-22 | GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) | A control system for diagnosing a malfunction of a pressure sensor in an aftertreatment system of an internal combustion engine |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5349936A (en) * | 1992-08-05 | 1994-09-27 | Mitsubishi Denki Kabushiki Kaisha | Method of diagnosing exhaust gas recirculation control system of internal combustion engine and apparatus for carrying out the same |
| CN205719385U (en) * | 2016-03-30 | 2016-11-23 | 广州市设计院 | Air cleaner pressure test device with remote transmission function |
| CN110132381A (en) * | 2019-06-29 | 2019-08-16 | 潍柴动力股份有限公司 | Venturi differential pressure pickup credibility diagnostic method and device |
| CN110487481A (en) * | 2019-09-25 | 2019-11-22 | 潍柴动力股份有限公司 | Venturi meter differential pressure pickup monitoring method and device |
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