CN112576396B - Atmospheric pressure detection method and device for engine - Google Patents
Atmospheric pressure detection method and device for engine Download PDFInfo
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- CN112576396B CN112576396B CN202011461484.1A CN202011461484A CN112576396B CN 112576396 B CN112576396 B CN 112576396B CN 202011461484 A CN202011461484 A CN 202011461484A CN 112576396 B CN112576396 B CN 112576396B
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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
- F02D41/22—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
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/04—Engine intake system parameters
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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
Abstract
The embodiment of the invention discloses an atmospheric pressure detection method and device of an engine. The method includes judging whether the atmospheric pressure sensor works normally; if the atmospheric pressure sensor cannot work normally, the atmospheric pressure is determined according to the intake pressure acquired by the intake pressure sensor. The purpose that the engine can work normally is achieved under the condition that the atmospheric pressure sensor in the engine fails or the atmospheric pressure sensor is not installed in the engine is achieved.
Description
Technical Field
The embodiment of the invention relates to an engine design technology, in particular to an atmospheric pressure detection method and device of an engine.
Background
The air inflow of the engine is taken as one of engine operation control parameters, the air inflow directly influences the normal operation of the engine, and is taken as an important factor for calculating the air inflow, if the atmospheric pressure sensor fails, the engine can not normally operate indirectly, and the phenomena of insufficient power, black smoke emission and the like occur; for vehicles without an atmospheric pressure sensor, an electronic control system (ECU) cannot obtain an accurate atmospheric pressure value to meet the normal working requirement of an engine.
Disclosure of Invention
The embodiment of the invention provides an atmospheric pressure detection method and device for an engine, which are used for realizing normal operation of the engine under the condition that an atmospheric sensor in the engine fails or the atmospheric pressure sensor is not installed in the engine.
In a first aspect, an embodiment of the present invention provides a method for detecting an atmospheric pressure of an engine, including:
judging whether the atmospheric pressure sensor works normally or not;
and if the atmospheric pressure sensor cannot work normally, determining the atmospheric pressure according to the air inlet pressure acquired by the air inlet pressure sensor.
Optionally, determining whether the atmospheric pressure sensor is operating properly includes:
judging whether an atmospheric pressure sensor is installed in the engine;
or judging whether the atmospheric pressure sensor fails;
if the atmospheric pressure sensor cannot work normally, determining the atmospheric pressure according to the intake pressure acquired by the intake pressure sensor, including:
if the engine is not provided with an atmospheric pressure sensor, determining the atmospheric pressure according to the air inlet pressure acquired by the air inlet pressure sensor;
and if the atmospheric pressure sensor fails, determining the atmospheric pressure according to the air inlet pressure acquired by the air inlet pressure sensor.
Optionally, determining the atmospheric pressure according to the intake pressure acquired by the intake pressure sensor includes:
determining a pressure ratio correction coefficient between the intake pressure and the atmospheric pressure according to the intake pressure, the average air flow, the intake temperature and the effective area of the intake pipe based on a compressible gas equation;
acquiring a corresponding relation between a pressure ratio between the intake pressure and the atmospheric pressure and a pressure ratio correction coefficient;
determining a pressure ratio between the intake pressure and the atmospheric pressure according to the pressure ratio correction coefficient and the corresponding relation;
and determining the atmospheric pressure according to the pressure ratio between the air inlet pressure and the atmospheric pressure and the air inlet pressure.
Optionally, the compressible gas equation is:
wherein, the liquid crystal display device comprises a liquid crystal display device,
is the average air mass flow; r is a gas constant; p is p 0 Is the air inlet pressure; p is atmospheric pressure; a is that Eff The effective area of the air inlet pipe; t (T) 0 Is the temperature of the intake air; phi (p) 0 And/p) is the intake pressure p 0 Pressure ratio p with atmospheric pressure p 0 Correction coefficient of/p.
Optionally, the method for detecting atmospheric pressure further includes:
and if the atmospheric pressure sensor works normally, directly determining the atmospheric pressure according to the atmospheric pressure acquired by the atmospheric pressure sensor.
Optionally, the method for detecting atmospheric pressure further includes:
the atmospheric pressure is calibrated according to the operating state of the engine, the intake pressure, and the atmospheric pressure.
Optionally, the working states of the engine comprise a power-on state, a starting state, an operating state and a flameout state;
calibrating the atmospheric pressure based on the operating state of the engine, the intake pressure, and the atmospheric pressure, comprising:
judging whether the engine enters a power-on state or not;
if the engine enters a power-on state, calibrating the atmospheric pressure according to the air inlet pressure;
if the engine does not enter a power-on state, judging whether the engine enters a starting state;
if the engine enters a starting state, calibrating the atmospheric pressure according to the current value of the atmospheric pressure;
if the engine does not enter a starting state, judging whether the engine enters a running state;
if the engine enters an operating state, judging whether the air inlet pressure is greater than the atmospheric pressure;
if the air inlet pressure is greater than the atmospheric pressure, calibrating the atmospheric pressure according to the air inlet pressure;
if the air inlet pressure is smaller than or equal to the atmospheric pressure, calibrating the atmospheric pressure according to the pressure ratio between the air inlet pressure and the atmospheric pressure and the air inlet pressure;
if the engine does not enter the running state, judging whether the engine enters a flameout state;
if the engine enters a flameout state, calibrating the atmospheric pressure according to the current value of the atmospheric pressure;
if the engine does not enter a flameout state, calibrating the atmospheric pressure according to a preset atmospheric pressure value; the preset barometric pressure value is positively correlated with ambient pressure.
Optionally, calibrating the atmospheric pressure according to the intake pressure includes:
and determining a first atmospheric pressure and a second atmospheric pressure acquired by the atmospheric pressure sensor according to the pressure ratio between the air inlet pressure and the atmospheric pressure and comparing the first atmospheric pressure and the second atmospheric pressure, and calibrating the atmospheric pressure according to the air inlet pressure when the first atmospheric pressure and the second atmospheric pressure do not meet the preset requirement.
Optionally, when the first atmospheric pressure p 1 With the second atmospheric pressure p 2 Satisfy |p 1 -p 2 |/p 1 And when the pressure is more than or equal to 10%, the first atmospheric pressure and the second atmospheric pressure do not meet the preset requirement.
In a second aspect, an embodiment of the present invention provides an atmospheric pressure detection device of an engine, including:
the judging module is used for judging whether the atmospheric pressure sensor works normally or not;
and the determining module is used for determining the atmospheric pressure according to the air inlet pressure acquired by the air inlet pressure sensor if the atmospheric pressure sensor cannot work normally.
The invention provides an atmospheric pressure detection method of an engine, which comprises the steps of judging whether an atmospheric pressure sensor works normally or not; if the atmospheric pressure sensor cannot work normally, the atmospheric pressure is determined according to the intake pressure acquired by the intake pressure sensor. The purpose that the engine can work normally is achieved under the condition that the atmospheric pressure sensor in the engine fails or the atmospheric pressure sensor is not installed in the engine is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, a brief description will be given below of the drawings required for the embodiments or the description of the prior art, and it is obvious that although the drawings in the following description are specific embodiments of the present invention, it is obvious to those skilled in the art that the basic concepts of the device structure, the driving method and the manufacturing method, which are disclosed and suggested according to the various embodiments of the present invention, are extended and extended to other structures and drawings, and it is needless to say that these should be within the scope of the claims of the present invention.
Fig. 1 is a flow chart of an atmospheric pressure detection method of an engine according to a first embodiment of the present invention;
FIG. 2 is a flow chart of another method for detecting the atmospheric pressure of an engine according to the first embodiment of the present invention;
FIG. 3 is a flow chart of an atmospheric pressure detection method of another engine according to the first embodiment of the present invention;
fig. 4 is a schematic structural diagram of an atmospheric pressure detecting device of an engine according to a second embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described by means of implementation examples with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments obtained by those skilled in the art based on the basic concepts disclosed and suggested by the embodiments of the present invention are within the scope of the present invention.
Example 1
Fig. 1 is a schematic flow chart of an atmospheric pressure detection method of an engine according to a first embodiment of the present invention, as shown in fig. 1, the technical solution of this embodiment is suitable for an engine running situation. The method may be performed by an atmospheric pressure detection device, which may be implemented in software and/or hardware. The method specifically comprises the following steps: comprising the following steps:
s101, judging whether the atmospheric pressure sensor works normally or not.
S102, if the atmospheric pressure sensor cannot work normally, determining the atmospheric pressure according to the air inlet pressure acquired by the air inlet pressure sensor.
The failure of the atmospheric pressure sensor can include failure of the atmospheric pressure sensor or failure of the atmospheric pressure sensor in the engine, and the acquisition of the atmospheric pressure can not be performed, so that the normal operation of the engine is realized.
According to the scheme, whether the atmospheric pressure sensor works normally or not is judged, if the atmospheric pressure sensor works normally, the atmospheric pressure value of the current engine is determined according to the atmospheric pressure sensor, if the atmospheric pressure sensor cannot work normally, the atmospheric pressure is determined according to the air inlet pressure obtained by the air inlet pressure sensor, the normal work of the engine is ensured under the condition that the atmospheric pressure sensor fails or the atmospheric pressure sensor is not installed, and the dependence of engine control on the atmospheric pressure sensor is solved.
Fig. 2 is a flow chart of another method for detecting the atmospheric pressure of an engine according to the first embodiment of the present invention, as shown in fig. 2, optionally, the determining whether the atmospheric pressure sensor is operating normally includes:
s201, it is determined whether or not an atmospheric pressure sensor is mounted in the engine.
If yes, S202 is executed.
If not, S203 is performed.
S202, judging whether the atmospheric pressure sensor fails.
If yes, S204 is executed.
If not, S205 is performed.
If the engine is not equipped with an atmospheric pressure sensor, the atmospheric pressure is determined from the intake pressure obtained by the intake pressure sensor S203.
S204, if the atmospheric pressure sensor fails, determining the atmospheric pressure according to the air inlet pressure acquired by the air inlet pressure sensor.
S205, if the atmospheric pressure sensor works normally, directly determining the atmospheric pressure according to the atmospheric pressure acquired by the atmospheric pressure sensor.
Optionally, determining the atmospheric pressure according to the intake pressure acquired by the intake pressure sensor includes:
determining a pressure ratio correction coefficient between the intake pressure and the atmospheric pressure according to the intake pressure, the average air flow, the intake temperature and the effective area of the intake pipe based on the compressible gas equation;
the air inlet pressure, the average air flow, the air inlet temperature and the effective area of the air inlet pipe can be obtained through an electronic control unit ECU (electronic control unit) installed on the vehicle, the air inlet temperature changes along with the change of the air inlet pressure, and the electronic control unit ECU needs to correct the air inlet temperature to obtain the final air inlet temperature for subsequent determination of the atmospheric pressure.
Alternatively, the compressible gas equation is:
wherein, the liquid crystal display device comprises a liquid crystal display device,
is the average air mass flow; r is a gas constant; p is p 0 Is the air inlet pressure; p is atmospheric pressure; a is that Eff The effective area of the air inlet pipe; t (T) 0 Is the temperature of the intake air; phi (p) 0 And/p) is the intake pressure p 0 Pressure ratio p with atmospheric pressure p 0 Correction coefficient of/p.
Acquiring a corresponding relation between a pressure ratio between the intake pressure and the atmospheric pressure and a pressure ratio correction coefficient;
wherein if the engine is not equipped with the atmospheric pressure sensor or the atmospheric pressure sensor fails, the intake pressure p is used for 0 Average air flow
Intake air temperature T 0 And an air inlet pipe effective area A Eff Determining the intake pressure p according to the above formula 0 Pressure ratio p with atmospheric pressure p 0 Correction coefficient phi (p) 0 /p)。
Determining a pressure ratio between the intake pressure and the atmospheric pressure according to the pressure ratio correction coefficient and the corresponding relation;
wherein due to the intake pressure p 0 Pressure ratio p with atmospheric pressure p 0 P and intake pressure p 0 Pressure ratio p with atmospheric pressure p 0 Correction coefficient phi (p) 0 The relation of/p) is determined and can be obtained by looking up a table, the known intake pressure p 0 Pressure ratio p with atmospheric pressure p 0 Correction coefficient phi (p) 0 P) to obtain the intake pressure p 0 Pressure ratio p with atmospheric pressure p 0 /p。
The atmospheric pressure is determined from the pressure ratio between the intake pressure and the atmospheric pressure.
Wherein the intake pressure p is known 0 Intake pressure p 0 Pressure ratio p with atmospheric pressure p 0 And/p, the atmospheric pressure can be determined, and then the normal operation of the engine is realized.
Optionally, the atmospheric pressure detection method further includes:
the atmospheric pressure is calibrated according to the operating state of the engine, the intake pressure, and the atmospheric pressure.
The atmospheric pressure is calibrated according to the working state of the engine, the air inlet pressure and the atmospheric pressure, so that whether the atmospheric pressure sensor fails or not is judged, and the accuracy of the finally determined atmospheric pressure value is ensured.
FIG. 3 is a schematic flow chart of an atmospheric pressure detection method of an engine according to a first embodiment of the present invention, and as shown in FIG. 3, optional working states of the engine include a power-on state, a start-up state, an operation state and a flameout state;
calibrating the atmospheric pressure according to the operating condition of the engine, the intake pressure and the atmospheric pressure, comprising:
s301, judging whether the engine enters a power-on state.
If yes, S302 is performed.
If not, then S303 is performed.
And S302, if the engine enters a power-on state, calibrating the atmospheric pressure according to the air inlet pressure.
The engine is in a power-on state, the engine does not start to work at the moment, the air inlet pressure sensor and the atmospheric pressure sensor start to work, the air inlet pressure obtained by the air inlet pressure sensor and the atmospheric pressure obtained by the atmospheric pressure sensor are equal to the atmospheric pressure, at the moment, if the air inlet pressure is equal to the atmospheric pressure, the air inlet pressure sensor is judged to work normally, and the final value of the atmospheric pressure can be determined according to the air inlet pressure; and if the air inlet pressure is not equal to the atmospheric pressure, judging that the atmospheric pressure sensor fails.
S303, if the engine does not enter the power-on state, judging whether the engine enters the starting state.
If yes, S304 is executed.
If not, S305 is performed.
And S304, if the engine enters a starting state, calibrating the atmospheric pressure according to the current value of the atmospheric pressure.
The engine is in a starting state, the air inlet pressure sensor and the atmospheric pressure sensor are in working states, the air inlet pressure obtained by the air inlet pressure sensor and the atmospheric pressure obtained by the atmospheric pressure sensor are in working states, and at the moment, if the air inlet pressure is equal to the atmospheric pressure, the atmospheric pressure sensor is judged to work normally, and the final atmospheric pressure value can be determined according to the current atmospheric pressure value; and if the air inlet pressure is not equal to the atmospheric pressure, judging that the atmospheric pressure sensor fails.
S305, if the engine does not enter the starting state, judging whether the engine enters the running state.
If yes, S306 is executed.
If not, S307 is performed.
S307, if the engine does not enter the running state, judging whether the engine enters the flameout state.
If yes, then execution proceeds to S308.
If not, S309 is performed.
And S308, if the engine enters a flameout state, calibrating the atmospheric pressure according to the current value of the atmospheric pressure.
The engine does not enter a running state and enters a flameout state, the atmospheric pressure sensor works normally, and the final atmospheric pressure value is determined according to the current atmospheric pressure value obtained by the atmospheric pressure sensor.
S309, if the engine does not enter a flameout state, calibrating the atmospheric pressure according to a preset atmospheric pressure value; the preset barometric pressure value is positively correlated with the ambient pressure.
The engine does not enter a running state and does not enter a flameout state at the same time, and the atmospheric pressure sensor is judged to be faulty at the moment. And because the environments of different areas are different and the corresponding atmospheric pressures are different, the final atmospheric pressure value is determined according to the preset atmospheric pressure value set by the ambient pressure.
S306, if the engine enters an operation state, whether the air inlet pressure is larger than the atmospheric pressure is judged.
If yes, then S310 is performed.
If not, S311 is performed.
When the engine enters the running state, if the air inlet pressure sensor and the atmospheric pressure sensor are in a normal working state, the air inlet pressure is larger than the atmospheric pressure at the moment, and whether the air inlet pressure is larger than the atmospheric pressure is judged to be beneficial to determining whether the atmospheric pressure sensor fails.
And S311, if the air inlet pressure is less than or equal to the atmospheric pressure, calibrating the atmospheric pressure according to the pressure ratio between the air inlet pressure and the atmospheric pressure and the air inlet pressure.
If the intake pressure is less than or equal to the atmospheric pressure, the atmospheric pressure sensor is judged to be faulty, and at the moment, the final atmospheric pressure value is determined according to the intake pressure acquired by the intake pressure sensor and the pressure ratio between the intake pressure and the atmospheric pressure obtained by the compressible gas formula.
And S310, if the air inlet pressure is greater than the atmospheric pressure, calibrating the atmospheric pressure according to the air inlet pressure.
When the air inlet pressure is greater than the atmospheric pressure, in order to ensure that the final value of the atmospheric pressure is accurate, the atmospheric pressure acquired by the atmospheric pressure sensor and the atmospheric pressure determined according to the air inlet pressure acquired by the air inlet pressure sensor and the pressure ratio between the air inlet pressure and the atmospheric pressure acquired by the compressible gas formula are compared and calibrated.
Optionally, calibrating the atmospheric pressure according to the intake pressure includes:
and determining the first atmospheric pressure and the second atmospheric pressure acquired by the atmospheric pressure sensor according to the pressure ratio between the air inlet pressure and the atmospheric pressure and comparing the first atmospheric pressure and the second atmospheric pressure, and calibrating the atmospheric pressure according to the air inlet pressure when the first atmospheric pressure and the second atmospheric pressure do not meet the preset requirement.
Alternatively, when the first atmospheric pressure p 1 With a second atmospheric pressure p 2 Satisfy |p 1 -p 2 |/p 1 And when the pressure is more than or equal to 10% |, the first atmospheric pressure and the second atmospheric pressure do not meet the preset requirement.
Wherein the second atmospheric pressure p obtained when the atmospheric pressure sensor 2 And a first atmospheric pressure p determined from the intake pressure acquired by the intake pressure sensor and the pressure ratio between the intake pressure and the atmospheric pressure obtained by the compressible gas formula 1 Satisfy |p 1 -p 2 |/p 1 When the pressure is less than 10%, judging that the atmospheric pressure sensor does not work fault, and obtaining second atmospheric pressure p according to the atmospheric pressure sensor 2 Determining an atmospheric pressure final value; when the second atmospheric pressure p obtained by the atmospheric pressure sensor 2 And a first atmospheric pressure p determined from the intake pressure acquired by the intake pressure sensor and the pressure ratio between the intake pressure and the atmospheric pressure obtained by the compressible gas formula 1 Satisfy |p 1 -p 2 |/p 1 When the pressure is more than or equal to 10% | the working fault of the atmospheric pressure sensor is judged, and the first atmospheric pressure p is determined according to the air inlet pressure acquired by the air inlet pressure sensor and the pressure ratio between the air inlet pressure and the atmospheric pressure obtained by a compressible gas formula 1 The final value of the atmospheric pressure is determined.
According to the technical scheme, the atmospheric pressure sensor is installed in the engine to be faulty or the atmospheric pressure sensor is not installed in the engine to determine the atmospheric pressure, so that the dependence of the engine on the atmospheric pressure sensor is solved, the engine can work normally under the condition that the atmospheric pressure sensor is faulty or the atmospheric pressure sensor is not installed, the atmospheric pressure sensor is installed for the engine, the atmospheric pressure obtained by the atmospheric pressure sensor is calibrated in the power-on state, the starting state, the running state and the flameout state of the engine, the numerical accuracy of the atmospheric pressure in the engine is further guaranteed, and the fault probability of the engine is reduced.
Example two
Fig. 4 is a schematic structural diagram of an atmospheric pressure detection device of an engine according to a second embodiment of the present invention, and as shown in fig. 4, the atmospheric pressure detection device 400 includes:
the judging module 401 is configured to judge whether the atmospheric pressure sensor is operating normally.
The determining module 402 is configured to determine the atmospheric pressure according to the intake pressure obtained by the intake pressure sensor if the atmospheric pressure sensor fails to operate normally.
Since the atmospheric pressure detection device provided in this embodiment includes the same or corresponding advantages of any of the atmospheric pressure detection methods provided in the foregoing embodiments, the description thereof is omitted herein.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, and that various obvious changes, rearrangements, combinations, and substitutions can be made by those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (5)
1. An atmospheric pressure detection method of an engine, comprising:
judging whether the atmospheric pressure sensor works normally or not;
if the atmospheric pressure sensor cannot work normally, determining the atmospheric pressure according to the air inlet pressure acquired by the air inlet pressure sensor;
if the atmospheric pressure sensor works normally, directly determining the atmospheric pressure according to the atmospheric pressure acquired by the atmospheric pressure sensor;
calibrating the atmospheric pressure according to the operating state of the engine, the intake pressure and the atmospheric pressure;
the working states of the engine comprise a power-on state, a starting state, an operating state and a flameout state;
said calibrating said barometric pressure based on said engine operating state, said intake pressure, and said barometric pressure, comprising:
judging whether the engine enters a power-on state or not;
if the engine enters a power-on state, calibrating the atmospheric pressure according to the air inlet pressure;
if the engine does not enter a power-on state, judging whether the engine enters a starting state;
if the engine enters a starting state, calibrating the atmospheric pressure according to the current value of the atmospheric pressure;
if the engine does not enter a starting state, judging whether the engine enters a running state;
if the engine enters an operating state, judging whether the air inlet pressure is greater than the atmospheric pressure;
if the air inlet pressure is greater than the atmospheric pressure, calibrating the atmospheric pressure according to the air inlet pressure;
if the air inlet pressure is smaller than or equal to the atmospheric pressure, calibrating the atmospheric pressure according to the pressure ratio between the air inlet pressure and the atmospheric pressure and the air inlet pressure;
if the engine does not enter the running state, judging whether the engine enters a flameout state;
if the engine enters a flameout state, calibrating the atmospheric pressure according to the current value of the atmospheric pressure;
if the engine does not enter a flameout state, calibrating the atmospheric pressure according to a preset atmospheric pressure value; the preset atmospheric pressure value is positively correlated with the ambient pressure;
calibrating the atmospheric pressure based on the intake pressure, comprising:
determining a first atmospheric pressure and a second atmospheric pressure acquired by the atmospheric pressure sensor according to the pressure ratio between the air inlet pressure and the atmospheric pressure and the air inlet pressure, and calibrating the atmospheric pressure according to the air inlet pressure when the first atmospheric pressure and the second atmospheric pressure do not meet preset requirements; when the first atmospheric pressure p 1 With the second atmospheric pressure p 2 Satisfy |p 1 -p 2 |/p 1 And when the pressure is more than or equal to 10%, the first atmospheric pressure and the second atmospheric pressure do not meet the preset requirement.
2. The atmospheric pressure detection method according to claim 1, wherein determining whether the atmospheric pressure sensor is operating properly comprises:
judging whether an atmospheric pressure sensor is installed in the engine;
or judging whether the atmospheric pressure sensor fails;
if the atmospheric pressure sensor cannot work normally, determining the atmospheric pressure according to the intake pressure acquired by the intake pressure sensor, including:
if the engine is not provided with an atmospheric pressure sensor, determining the atmospheric pressure according to the air inlet pressure acquired by the air inlet pressure sensor;
and if the atmospheric pressure sensor fails, determining the atmospheric pressure according to the air inlet pressure acquired by the air inlet pressure sensor.
3. The atmospheric pressure detection method according to claim 1, wherein determining the atmospheric pressure from the intake pressure acquired by the intake pressure sensor comprises:
determining a pressure ratio correction coefficient between the intake pressure and the atmospheric pressure according to the intake pressure, the average air flow, the intake temperature and the effective area of the intake pipe based on a compressible gas equation;
acquiring a corresponding relation between a pressure ratio between the intake pressure and the atmospheric pressure and a pressure ratio correction coefficient;
determining a pressure ratio between the intake pressure and the atmospheric pressure according to the pressure ratio correction coefficient and the corresponding relation;
and determining the atmospheric pressure according to the pressure ratio between the air inlet pressure and the atmospheric pressure and the air inlet pressure.
4. The method of claim 3, wherein the compressible gas equation is:
wherein, the liquid crystal display device comprises a liquid crystal display device,
is the average air mass flow; r is a gas constant; p is p 0 Is the air inlet pressure; p is atmospheric pressure; a is that Eff The effective area of the air inlet pipe; t (T) 0 Is the temperature of the intake air; phi (p) 0 And/p) is the intake pressure p 0 Pressure ratio p with atmospheric pressure p 0 Correction coefficient of/p.
5. An atmospheric pressure detection device of an engine, comprising:
the judging module is used for judging whether the atmospheric pressure sensor works normally or not;
the determining module is used for determining the atmospheric pressure according to the air inlet pressure acquired by the air inlet pressure sensor if the atmospheric pressure sensor cannot work normally;
the determining module is further used for directly determining the atmospheric pressure according to the atmospheric pressure obtained by the atmospheric pressure sensor if the atmospheric pressure sensor works normally;
the calibration module is used for calibrating the atmospheric pressure according to the working state of the engine, the air inlet pressure and the atmospheric pressure;
the working states of the engine comprise a power-on state, a starting state, an operating state and a flameout state;
the calibration module is specifically used for judging whether the engine enters a power-on state or not;
if the engine enters a power-on state, calibrating the atmospheric pressure according to the air inlet pressure;
if the engine does not enter a power-on state, judging whether the engine enters a starting state;
if the engine enters a starting state, calibrating the atmospheric pressure according to the current value of the atmospheric pressure;
if the engine does not enter a starting state, judging whether the engine enters a running state;
if the engine enters an operating state, judging whether the air inlet pressure is greater than the atmospheric pressure;
if the air inlet pressure is greater than the atmospheric pressure, calibrating the atmospheric pressure according to the air inlet pressure;
if the air inlet pressure is smaller than or equal to the atmospheric pressure, calibrating the atmospheric pressure according to the pressure ratio between the air inlet pressure and the atmospheric pressure and the air inlet pressure;
if the engine does not enter the running state, judging whether the engine enters a flameout state;
if the engine enters a flameout state, calibrating the atmospheric pressure according to the current value of the atmospheric pressure;
if the engine does not enter a flameout state, calibrating the atmospheric pressure according to a preset atmospheric pressure value; the preset atmospheric pressure value is positively correlated with the ambient pressure;
calibrating the atmospheric pressure based on the intake pressure, comprising:
determining a first atmospheric pressure and a second atmospheric pressure acquired by the atmospheric pressure sensor according to the pressure ratio between the air inlet pressure and the atmospheric pressure and the air inlet pressure, and calibrating the atmospheric pressure according to the air inlet pressure when the first atmospheric pressure and the second atmospheric pressure do not meet preset requirements; when the first atmospheric pressure p 1 With the second atmospheric pressure p 2 Satisfy |p 1 -p 2 |/p 1 And when the pressure is more than or equal to 10%, the first atmospheric pressure and the second atmospheric pressure do not meet the preset requirement.
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| CN112576396A (en) | 2021-03-30 |
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