CN112211703B - Vehicle exhaust back pressure obtaining method, vehicle exhaust back pressure obtaining device and vehicle - Google Patents
Vehicle exhaust back pressure obtaining method, vehicle exhaust back pressure obtaining device and vehicle Download PDFInfo
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- CN112211703B CN112211703B CN201910621820.5A CN201910621820A CN112211703B CN 112211703 B CN112211703 B CN 112211703B CN 201910621820 A CN201910621820 A CN 201910621820A CN 112211703 B CN112211703 B CN 112211703B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
- F01N11/005—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus the temperature or pressure being estimated, e.g. by means of a theoretical model
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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 invention provides a vehicle exhaust back pressure obtaining method, a vehicle exhaust back pressure obtaining device and a vehicle, wherein the vehicle exhaust back pressure obtaining method comprises the following steps: acquiring a first exhaust back pressure of an engine of a vehicle; measuring a first voltage signal and a second voltage signal of a particle trap of a vehicle; obtaining a pressure difference value according to the first voltage signal and the second voltage signal, and obtaining a second exhaust back pressure according to the first exhaust back pressure and the pressure difference value; and selecting the first exhaust back pressure or the second exhaust back pressure as the vehicle exhaust back pressure according to the requirement of a user. The differential pressure value correction is introduced to obtain the second exhaust back pressure, so that the calculation precision of the engine exhaust back pressure is improved, and the reliability of the vehicle electronic control unit is improved. Furthermore, the first exhaust back pressure or the second exhaust back pressure is selected as the vehicle exhaust back pressure according to the requirements of users, so that the flexibility of obtaining the vehicle exhaust back pressure is improved.
Description
Technical Field
The invention relates to the technical field of vehicle engines, in particular to a vehicle exhaust back pressure obtaining method, a vehicle exhaust back pressure obtaining device and a vehicle.
Background
The engine exhaust back pressure refers to resistance pressure of engine exhaust, and the exhaust back pressure is one of key parameters of the design of a vehicle exhaust system and has great influence on the dynamic property, the economical efficiency and the like of the engine. For example, an increase in exhaust back pressure of the engine may cause unsmooth exhaust of the engine, increase fuel consumption of the engine, and decrease torque and power, thereby causing deterioration in both power efficiency and economy. The exhaust back pressure of the vehicle engine calculated in the prior art has the disadvantage of not being accurate enough.
Disclosure of Invention
The invention aims to provide a vehicle exhaust back pressure acquisition method, a vehicle exhaust back pressure acquisition device and a vehicle, and aims to solve the problem that the calculation of the exhaust back pressure of a vehicle engine is not accurate enough.
In order to solve the technical problem, the invention provides a method for obtaining exhaust back pressure of a vehicle, which comprises the following steps:
acquiring a first exhaust back pressure of an engine of a vehicle;
measuring a first voltage signal at a first end of a particle trap and a second voltage signal at a second end of the particle trap of a vehicle;
obtaining a pressure difference value according to the first voltage signal and the second voltage signal, and obtaining a second exhaust back pressure according to the first exhaust back pressure and the pressure difference value;
and selecting the first exhaust back pressure or the second exhaust back pressure as the vehicle exhaust back pressure according to the requirement of a user.
Optionally, in the method for obtaining the exhaust back pressure of the vehicle, the first voltage signal and the second voltage signal are measured at certain time intervals during the running of the vehicle to update the exhaust back pressure of the vehicle.
Optionally, in the vehicle exhaust back pressure obtaining method, a signal processing unit of a vehicle is used to convert the first voltage signal and the second voltage signal into a first voltage value and a second voltage value, respectively.
Optionally, in the vehicle exhaust back pressure obtaining method, the pressure difference value is obtained according to the first voltage value and the second voltage value by using the following formula: Δ P ═ P1-P2L, wherein P1Is a first voltage value, P2The second voltage value is Δ P, which is the differential pressure value.
Optionally, in the vehicle exhaust back pressure obtaining method, the second exhaust back pressure is obtained according to the first exhaust back pressure and the differential pressure value by using the following formula: a is1＝a0+. DELTA P of which0Is the first exhaust back pressure, and Δ P is the differential pressure value, a1Is the second exhaust back pressure.
Optionally, in the vehicle exhaust back pressure obtaining method, a signal processing unit of a vehicle is used to selectively output the first exhaust back pressure or the second exhaust back pressure.
Optionally, in the vehicle exhaust back pressure obtaining method, after selecting the first exhaust back pressure or the second exhaust back pressure as the vehicle exhaust back pressure, the method further includes:
and collecting the exhaust back pressure of the vehicle by using a data acquisition unit of the vehicle, and providing the exhaust back pressure of the vehicle to an upper computer.
Based on the same inventive concept, the present invention also provides a vehicle exhaust back pressure obtaining apparatus, comprising:
an acquisition unit for acquiring a first exhaust back pressure of an engine of a vehicle;
a measurement unit for measuring a first voltage signal at a first end of a particle trap of the vehicle and a second voltage signal at a second end of the particle trap of the vehicle; and
the signal processing unit is used for obtaining a pressure difference value according to the first voltage signal and the second voltage signal and obtaining a second exhaust back pressure according to the first exhaust back pressure and the pressure difference value; and is also used for selectively outputting the first exhaust back pressure or the second exhaust back pressure as the vehicle exhaust back pressure.
Optionally, in the vehicle exhaust back pressure obtaining apparatus, the signal processing unit includes:
a conversion unit for converting the first voltage signal into a first voltage value and the second voltage signal into a second voltage value by an analog-to-digital conversion technique;
the operation unit is used for obtaining a voltage difference value according to the first voltage value and the second voltage value; and obtaining a second exhaust back pressure according to the first exhaust back pressure and the pressure difference value; and
and the selection unit is used for selectively outputting the first exhaust back pressure or the second exhaust back pressure as the vehicle exhaust back pressure according to the requirement of a user.
Optionally, in the exhaust back pressure obtaining apparatus for a vehicle, the selecting unit includes a first input end, a second input end, an enabling end, a first output end, and a selection logic control gate, and the first input end, the second input end, the enabling end, and the first output end are all connected to the selection logic control gate;
the first input end is used for receiving the first exhaust back pressure, the second input end is used for receiving the sum of the pressure difference value and the first exhaust back pressure, and the output end is used for outputting the first exhaust back pressure or the sum of the pressure difference value and the first exhaust back pressure;
the first input end, the selection logic control gate and the first output end form a first selection branch; the second input end, the selection logic control gate and the first output end form a second selection branch;
the enabling end is used for receiving an enabling signal;
the selection logic control gate controls the gating of the first selection branch or the second selection branch according to the received enable signal.
Optionally, in the vehicle exhaust back pressure obtaining apparatus, the enable signal is a system constant, the select logic control gate determines whether the enable signal is true or false, and when the enable signal is a true value, the select logic control gate controls the second selecting branch to be gated, and the first selecting branch is disconnected;
when the enable signal is a false value, the selection logic controls the gate to control the gating of the first selection branch, and the second selection branch is disconnected.
Optionally, in the vehicle exhaust back pressure obtaining apparatus, the vehicle exhaust back pressure obtaining apparatus further includes: and the data acquisition unit is connected with the signal processing unit and is used for acquiring the exhaust back pressure of the vehicle and providing the exhaust back pressure of the vehicle to the upper computer.
Optionally, in the vehicle exhaust back pressure obtaining apparatus, the measuring unit is a pressure sensor.
Alternatively, in the vehicle exhaust back pressure obtaining device, the number of the pressure sensors is two.
Based on the same inventive concept, the present invention also provides a vehicle, comprising: the device comprises an engine, a particle catcher and a vehicle exhaust back pressure acquisition device; the vehicle exhaust back pressure acquisition device comprises an acquisition unit, a measurement unit and a signal processing unit; the acquisition unit is used for acquiring a first exhaust back pressure of the engine; the measuring unit is used for measuring a first voltage signal of a first end of the particle trap and a second voltage signal of a second end of the particle trap; the signal processing unit is used for obtaining a pressure difference value according to the first voltage signal and the second voltage signal, obtaining a second exhaust back pressure according to the first exhaust back pressure and the pressure difference value, and selecting the first exhaust back pressure or the second exhaust back pressure as a vehicle exhaust back pressure according to user requirements.
With the tightening of the requirements on the emission quantity of particulate matters in the national six-emission regulations, a gasoline engine particulate filter (GPF) is applied to a certain extent. After the GPF is added, particulate matter is trapped by the GPF and accumulated therein, and when the accumulation amount is excessively large, an increase in exhaust back pressure of the engine is caused, so that the fuel consumption of the engine increases, the drivability decreases, and the like. However, the influence of the accumulation of particulate matter in the GPF on the exhaust back pressure is not considered in the current vehicle electronic control unit, which causes the current vehicle electronic control unit to calculate the exhaust back pressure inaccurately, thereby affecting the calculation accuracy of the vehicle electronic control unit.
In summary, the present invention provides a method for obtaining exhaust back pressure of a vehicle, including: firstly, acquiring a first exhaust back pressure of a vehicle engine by using an acquisition unit of the vehicle exhaust back pressure acquisition device; then measuring voltage signals at two ends of the particle catcher by using a measuring unit of the vehicle exhaust back pressure obtaining device; finally, obtaining a differential pressure value according to the two voltage signals by utilizing a signal processing unit of the vehicle exhaust back pressure obtaining device; obtaining a second exhaust back pressure according to the first exhaust back pressure and the pressure difference value; and selecting the first exhaust back pressure or the second exhaust back pressure as the vehicle exhaust back pressure according to the user requirement, wherein the differential pressure value is introduced for correction and the second exhaust back pressure is obtained, so that the accurate measurement of the vehicle exhaust back pressure is realized, the calculation precision of the engine exhaust back pressure is improved, and the reliability of the vehicle electronic control unit is improved. Further, the first exhaust back pressure or the second exhaust back pressure is selected as the vehicle exhaust back pressure, so that the flexibility of obtaining the vehicle exhaust back pressure is improved; further, the present invention also provides a vehicle exhaust back pressure obtaining apparatus, including: an acquisition unit for acquiring a first exhaust back pressure of a vehicle engine; the measuring unit is used for measuring a first voltage signal and a second voltage signal of the particle trap; the signal processing unit is used for converting the first voltage signal and the second voltage signal into a differential pressure value and obtaining a second exhaust back pressure according to the first exhaust back pressure and the differential pressure value; and is also used for selectively outputting the first exhaust back pressure or the second exhaust back pressure as the vehicle exhaust back pressure. And correcting the first exhaust back pressure by using the differential pressure value, so that the calculation accuracy of the engine exhaust back pressure is improved.
Drawings
FIG. 1 is a flowchart of a vehicle exhaust back pressure obtaining method according to an embodiment of the invention;
FIG. 2 is a schematic view of a vehicle exhaust back pressure obtaining apparatus according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a signal processing unit according to an embodiment of the invention;
10-obtaining unit, 20-measuring unit, 30-signal processing unit, 31-converting unit, 32-calculating unit, 33-selecting unit, 40-data collecting unit, 100-first exhaust back pressure, 101-first voltage signal, 102-second voltage signal, 103-first voltage value, 104-second voltage value, 105-differential pressure value, 106-enabling signal, 110-second exhaust back pressure and 120-vehicle exhaust back pressure.
Detailed Description
The following describes a vehicle exhaust back pressure obtaining method, a vehicle exhaust back pressure obtaining device and a vehicle in further detail with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention. Further, the structures illustrated in the drawings are often part of actual structures. In particular, the drawings may have different emphasis points and may sometimes be scaled differently.
The invention provides a vehicle exhaust back pressure obtaining method, and referring to fig. 1, fig. 1 is a flowchart of a vehicle exhaust back pressure obtaining method according to an embodiment of the invention, and the vehicle exhaust back pressure obtaining method includes the following steps:
s10: acquiring a first exhaust back pressure of an engine of a vehicle;
s20: measuring a first voltage signal at a first end of a particle trap and a second voltage signal at a second end of the particle trap of a vehicle;
s30: obtaining a pressure difference value according to the first voltage signal and the second voltage signal, and obtaining a second exhaust back pressure according to the first exhaust back pressure and the pressure difference value;
s40: and selecting the first exhaust back pressure or the second exhaust back pressure as the vehicle exhaust back pressure according to the requirement of a user.
Specifically, referring to fig. 2 and 3, fig. 2 is a schematic diagram of a vehicle exhaust back pressure obtaining device according to an embodiment of the present invention, fig. 3 is a schematic diagram of a signal processing unit according to an embodiment of the present invention, and the vehicle exhaust back pressure obtaining method is described in detail below.
First, a first exhaust back pressure 100 of an engine of a vehicle is acquired by the acquisition unit 10.
Then, a first voltage signal 101 at a first end of the particle trap and a second voltage signal 102 at a second end of the particle trap of the vehicle are measured by the measurement unit 20.
Then, the first voltage signal 101 and the second voltage signal 102 are converted into the first voltage value 103 and the second voltage value 104 by the conversion unit 31 of the signal processing unit 30; then, a voltage difference value 105 is obtained by an arithmetic unit of the signal processing unit 30 by using the first voltage value 103 and the second voltage value 104; then, by means of the selection unit of the signal processing unit 30, it is selected whether the first exhaust back pressure 100 or the second exhaust back pressure 110 (i.e. the sum of the differential pressure value 105 and the first exhaust back pressure 100) is the final vehicle exhaust back pressure 120. Referring to fig. 2, the signal processing unit 30 includes: a conversion unit 31, an operation unit 32 and a selection unit 33, wherein the conversion unit 31 is configured to convert the first voltage signal 101 into a first voltage value 103 and convert the second voltage signal 102 into a second voltage value 104; the arithmetic unit32 is configured to obtain a pressure difference value 105 according to the first voltage value 103 and the second voltage value 104, and obtain a second exhaust back pressure 110 according to the first exhaust back pressure 100 and the pressure difference value 105; the selection unit 33 can selectively output the first exhaust back pressure 100 or the second exhaust back pressure 120 as the final vehicle exhaust back pressure 130 according to the user's needs. In this embodiment, the voltage difference value 105 is obtained according to the first voltage value 103 and the second voltage value 104 by using the following formula: Δ P ═ P1-P2L, wherein P1Is a first voltage value, P2The second voltage value is Δ P, which is the differential pressure value. Further, the second exhaust back pressure 110 is obtained from the first exhaust back pressure 100 and the differential pressure value 105 by using the following formula: a is1＝a0+. DELTA P of which0Is the first exhaust back pressure, and Δ P is the differential pressure value, a1Is the second exhaust back pressure. The pressure difference value 105 is introduced into the vehicle exhaust back pressure obtaining method provided by the invention, so that the first exhaust back pressure 100 directly obtained by the obtaining unit 10 is corrected and the more accurate final vehicle exhaust back pressure 120 is obtained, the accurate measurement of the vehicle exhaust back pressure is realized, and the flexibility of obtaining the vehicle exhaust back pressure is improved.
Finally, the first exhaust back pressure 100 or the second exhaust back pressure 110 is selected as the vehicle exhaust back pressure 120 according to the user's needs.
Further, after the vehicle exhaust back pressure 120 is obtained, the vehicle exhaust back pressure 120 is collected by the data collecting unit 40 of the vehicle, and the vehicle exhaust back pressure 120 is provided to the upper computer.
In the present embodiment, during the running of the vehicle, the first voltage signal 101 and the second voltage signal 102 are measured at certain time intervals to update the final exhaust back pressure 120 of the vehicle.
Based on the same inventive concept, the present invention further provides a vehicle exhaust back pressure obtaining apparatus, referring to fig. 2 in combination with fig. 3, the vehicle exhaust back pressure obtaining apparatus comprising: an acquisition unit 10 for acquiring a first exhaust back pressure 100 of an engine of a vehicle; a measuring unit 20, wherein the measuring unit 20 is configured to measure a first voltage signal 101 at a first end of a particle trap of the vehicle and a second voltage signal 102 at a second end of the particle trap of the vehicle, and output the measured first voltage signal 101 and second voltage signal 102 to the signal processing unit 30; the signal processing unit 30 is used for obtaining a voltage difference value 105 according to the first voltage signal 101 and the second voltage signal 102; and is further configured to derive a vehicle exhaust back pressure 120 from the first exhaust back pressure 100 and the pressure difference value 105.
Preferably, the selection unit 33 includes a first input end, a second input end, an enable end, a first output end and a selection logic control gate, and the first input end, the second input end, the enable end and the first output end are all connected to the selection logic control gate;
the first input end is configured to receive the first exhaust back pressure 100, the second input end is configured to receive the sum of the differential pressure value 105 and the first exhaust back pressure 100, and the output end is configured to output the first exhaust back pressure 100 or the sum of the differential pressure value 105 and the first exhaust back pressure 100, in this embodiment, the sum of the differential pressure value 105 and the first exhaust back pressure 100 is the second exhaust back pressure 110, that is, the selection unit 33 can control the output end to output the first exhaust back pressure 100 or the second exhaust back pressure 110 as the final vehicle exhaust back pressure 120 according to actual conditions;
the first input end, the selection logic control gate and the first output end form a first selection branch; the second input end, the selection logic control gate and the first output end form a second selection branch;
the enable terminal is used for receiving an enable signal 106;
the selection logic control gate controls the gating of the first selection branch or the second selection branch according to the enable signal 106 received by the enable terminal.
In this embodiment, the enable signal 106 is a system constant, for example, a positive integer such as 0,1,2, etc., the select logic control gate determines whether the enable signal 106 is true or false, when the enable signal 106 is true, the select logic control gate controls the gating of the second select branch, and the first select branch is turned off; when the enable signal 106 is false, the selection logic controls the gating of the first selection branch, and the second selection branch is turned off.
Further, the measuring unit 20 is a pressure sensor, in this embodiment, the number of the pressure sensors is two, and the two pressure sensors are installed on two opposite sides of a gasoline engine particulate trap of a vehicle, and can measure a first voltage signal 101 and a second voltage signal 102, and transmit the first voltage signal and the second voltage signal to the converting unit 31 of the signal processing unit 30.
In the prior art, the influence of the accumulation of particulate matters in the gasoline engine particulate trap on the exhaust back pressure of the vehicle is not generally considered by an electronic control unit of the vehicle, and the invention aims at the influence of the accumulation of the particulate matters in the gasoline engine particulate trap on the exhaust back pressure of the vehicle, obtains a pressure difference value through the measuring unit 20 and the signal processing unit 30, and corrects the first exhaust back pressure 100 by using the pressure difference value to obtain the final exhaust back pressure 120 of the vehicle, so that the calculation precision of the exhaust back pressure of the engine is improved, and the reliability of the electronic control unit of the vehicle is improved.
In this embodiment, the vehicle exhaust back pressure obtaining apparatus further includes: and the data acquisition unit 40 is connected with the signal processing unit 30, and the data acquisition unit 40 is used for acquiring the vehicle exhaust back pressure 120 and providing the vehicle exhaust back pressure 120 to an upper computer.
Based on the same inventive concept, the present invention also provides a vehicle, comprising: the device comprises an engine, a particle catcher and a vehicle exhaust back pressure acquisition device; the vehicle exhaust back pressure acquisition device comprises an acquisition unit 10, a measurement unit 20 and a signal processing unit 30; the acquiring unit 10 is used for acquiring a first exhaust back pressure of the engine; the measurement unit 20 is configured to measure a first voltage signal 101 at a first end of the particle trap and a second voltage signal 102 at a second end of the particle trap; the signal processing unit 30 converts the first voltage signal 101 and the second voltage signal 102 into the first voltage value 103 and the second voltage value 104, then obtains a pressure difference value 105 by using the first voltage value 103 and the second voltage value 104 for transportation, obtains a second exhaust back pressure 110 according to the first exhaust back pressure 100 and the pressure difference value 105, and selects the first exhaust back pressure 100 or the second exhaust back pressure 110 as a vehicle exhaust back pressure 120 according to user requirements.
In summary, the present invention provides a method for obtaining exhaust back pressure of a vehicle, including: firstly, acquiring a first exhaust back pressure of a vehicle engine by using an acquisition unit of the vehicle exhaust back pressure acquisition device; then measuring voltage signals at two ends of the particle catcher by using a measuring unit of the vehicle exhaust back pressure obtaining device; finally, obtaining a differential pressure value according to the two voltage signals by utilizing a signal processing unit of the vehicle exhaust back pressure obtaining device; obtaining a second exhaust back pressure according to the first exhaust back pressure and the pressure difference value; and selecting the first exhaust back pressure or the second exhaust back pressure as the vehicle exhaust back pressure according to the user requirement, wherein the differential pressure value is introduced for correction and the second exhaust back pressure is obtained, so that the accurate measurement of the vehicle exhaust back pressure is realized, the calculation precision of the engine exhaust back pressure is improved, and the reliability of the vehicle electronic control unit is improved. Further, the first exhaust back pressure or the second exhaust back pressure is selected as the vehicle exhaust back pressure, so that the flexibility of obtaining the vehicle exhaust back pressure is improved; further, the present invention also provides a vehicle exhaust back pressure obtaining apparatus, including: an acquisition unit for acquiring a first exhaust back pressure of a vehicle engine; the measuring unit is used for measuring a first voltage signal and a second voltage signal of the particle trap; the signal processing unit is used for converting the first voltage signal and the second voltage signal into a differential pressure value and obtaining a second exhaust back pressure according to the first exhaust back pressure and the differential pressure value; and is also used for selectively outputting the first exhaust back pressure or the second exhaust back pressure as the vehicle exhaust back pressure. And correcting the first exhaust back pressure by using the differential pressure value, so that the calculation accuracy of the engine exhaust back pressure is improved.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (14)
1. A vehicle exhaust back pressure obtaining method, characterized by comprising:
acquiring a first exhaust back pressure of an engine of a vehicle;
measuring a first voltage signal at a first end of a particle trap and a second voltage signal at a second end of the particle trap of a vehicle;
obtaining a pressure difference value according to the first voltage signal and the second voltage signal, and obtaining a second exhaust back pressure according to the first exhaust back pressure and the pressure difference value;
selecting the first exhaust back pressure or the second exhaust back pressure as the vehicle exhaust back pressure according to the requirement of a user;
obtaining the second exhaust back pressure according to the first exhaust back pressure and the differential pressure value by adopting the following formula: a is1＝a0+. DELTA P of which0Is the first exhaust back pressure, and Δ P is the differential pressure value, a1Is the second exhaust back pressure.
2. The vehicle exhaust back pressure obtaining method according to claim 1, wherein the first voltage signal and the second voltage signal are measured at a certain time interval during vehicle running to update the vehicle exhaust back pressure.
3. The vehicle exhaust back pressure obtaining method according to claim 1, wherein the first voltage signal and the second voltage signal are converted into a first voltage value and a second voltage value, respectively, by a signal processing unit of a vehicle.
4. According to claim 3The vehicle exhaust back pressure obtaining method is characterized in that the differential pressure value is obtained according to the first voltage value and the second voltage value by adopting the following formula: Δ P ═ P1-P2L, wherein P1Is a first voltage value, P2The second voltage value is Δ P, which is the differential pressure value.
5. The vehicle exhaust back pressure obtaining method according to claim 4, characterized in that the first exhaust back pressure or the second exhaust back pressure is selectively output using a signal processing unit of a vehicle.
6. The vehicle exhaust back pressure obtaining method according to claim 1, further comprising, after selecting the first exhaust back pressure or the second exhaust back pressure as a vehicle exhaust back pressure:
and collecting the exhaust back pressure of the vehicle by using a data acquisition unit of the vehicle, and providing the exhaust back pressure of the vehicle to an upper computer.
7. A vehicle exhaust back pressure obtaining apparatus, characterized by comprising:
an acquisition unit for acquiring a first exhaust back pressure of an engine of a vehicle;
a measurement unit for measuring a first voltage signal at a first end of a particle trap of the vehicle and a second voltage signal at a second end of the particle trap of the vehicle; and
the signal processing unit is used for obtaining a pressure difference value according to the first voltage signal and the second voltage signal and obtaining a second exhaust back pressure according to the first exhaust back pressure and the pressure difference value; the first exhaust back pressure or the second exhaust back pressure is also used for selectively outputting the first exhaust back pressure or the second exhaust back pressure as vehicle exhaust back pressure;
the signal processing unit is used for obtaining the second exhaust back pressure according to the first exhaust back pressure and the pressure difference value by adopting the following formula: a is1＝a0+. DELTA P of which0Is the first exhaust back pressure, and Δ P is the differential pressure value, a1Is the second exhaust back pressure.
8. The vehicle exhaust back pressure obtaining apparatus according to claim 7, wherein the signal processing unit includes:
a conversion unit for converting the first voltage signal into a first voltage value and the second voltage signal into a second voltage value by an analog-to-digital conversion technique;
the operation unit is used for obtaining a voltage difference value according to the first voltage value and the second voltage value; and obtaining a second exhaust back pressure according to the first exhaust back pressure and the pressure difference value; and
and the selection unit is used for selectively outputting the first exhaust back pressure or the second exhaust back pressure as the vehicle exhaust back pressure according to the requirement of a user.
9. The vehicle exhaust back pressure obtaining apparatus according to claim 8, wherein the selecting unit includes a first input terminal, a second input terminal, an enabling terminal, a first output terminal, and a selection logic control gate, and the first input terminal, the second input terminal, the enabling terminal, and the first output terminal are connected to the selection logic control gate;
the first input end is used for receiving the first exhaust back pressure, the second input end is used for receiving the sum of the pressure difference value and the first exhaust back pressure, and the output end is used for outputting the first exhaust back pressure or the sum of the pressure difference value and the first exhaust back pressure;
the first input end, the selection logic control gate and the first output end form a first selection branch; the second input end, the selection logic control gate and the first output end form a second selection branch;
the enabling end is used for receiving an enabling signal;
the selection logic control gate controls the gating of the first selection branch or the second selection branch according to the received enable signal.
10. The vehicle exhaust back pressure obtaining apparatus according to claim 9, wherein the enable signal is a system constant, the select logic control gate determines whether the enable signal is true or false, and when the enable signal is true, the select logic control gate controls the second select branch to be turned on, and the first select branch is turned off;
when the enable signal is a false value, the selection logic controls the gate to control the gating of the first selection branch, and the second selection branch is disconnected.
11. The vehicle exhaust back pressure obtaining apparatus according to claim 7, further comprising: and the data acquisition unit is connected with the signal processing unit and is used for acquiring the exhaust back pressure of the vehicle and providing the exhaust back pressure of the vehicle to the upper computer.
12. The vehicle exhaust back pressure obtaining apparatus according to claim 7, wherein the measuring unit is a pressure sensor.
13. The vehicle exhaust back pressure obtaining apparatus according to claim 12, wherein the number of the pressure sensors is two.
14. A vehicle, characterized by comprising: the device comprises an engine, a particle catcher and a vehicle exhaust back pressure acquisition device; the vehicle exhaust back pressure acquisition device comprises an acquisition unit, a measurement unit and a signal processing unit; the acquisition unit is used for acquiring a first exhaust back pressure of the engine; the measuring unit is used for measuring a first voltage signal of a first end of the particle trap and a second voltage signal of a second end of the particle trap; the signal processing unit is used for obtaining the first voltage signal and the second voltage signal according to the first voltage signal and the second voltage signalThe signal processing unit is used for obtaining the second exhaust back pressure according to the first exhaust back pressure and the pressure difference value by adopting the following formula: a is1＝a0+. DELTA P of which0Is the first exhaust back pressure, and Δ P is the differential pressure value, a1Is the second exhaust back pressure.
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