CN114294084B - Regeneration control method and device and vehicle - Google Patents
Regeneration control method and device and vehicle Download PDFInfo
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- CN114294084B CN114294084B CN202111644287.8A CN202111644287A CN114294084B CN 114294084 B CN114294084 B CN 114294084B CN 202111644287 A CN202111644287 A CN 202111644287A CN 114294084 B CN114294084 B CN 114294084B
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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 invention belongs to the technical field of vehicles and discloses a regeneration control method, a device and a vehicle. The high temperature fault detection includes monitoring whether a temperature upstream of the SCR is above a first setpoint. The DOC efficiency detection includes integrating the DPF upstream temperature and the SCR upstream temperature, and calculating a ratio of a difference between an integrated value of the DPF upstream temperature and an integrated value of the SCR upstream temperature to the integrated value of the DPF upstream temperature. The detection result judgment includes that if the SCR upstream temperature is higher than a first set value and the ratio of the difference between the integral value of the DPF upstream temperature and the integral value of the SCR upstream temperature to the integral value of the DPF upstream temperature is smaller than a second set value, the traveling regeneration is forbidden and the DOC efficiency is judged to be abnormal. The SCR damage caused by overhigh temperature of the SCR upstream is avoided, and the reason that the SCR upstream temperature is overhigh is judged to be abnormal because of DOC efficiency.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a regeneration control method and device and a vehicle.
Background
In order to reduce the content of NOx (nitrogen oxides) in the exhaust gas of a vehicle engine, an SCR (selective catalytic reduction) is provided in an exhaust gas emission system of a vehicle for injecting a reducing agent into the exhaust gas to reduce NOx in the exhaust gas into harmless components such as nitrogen, water, carbon dioxide, etc. by a selective catalytic reduction method. The catalyst system for SCR requires the use of a metal as a substrate for its catalyst, and the most commonly used catalysts in the art include copper-based SCR and vanadium-based SCR. In an exhaust gas aftertreatment system, a DPF (diesel particulate filter) is disposed upstream of an SCR to remove particulate matter contained in exhaust gas, and the DPF used for a long time may be poisoned or failed due to accumulation of particulate matter. Therefore, it is necessary to actively regenerate the DPF by injecting oil into a DOC (oxidation catalyst) upstream of the DPF and increasing the temperature of exhaust gas by an oxidation reaction of the oil in the DOC to burn particulate matter deposited on the DPF. However, if the temperature upstream of the SCR is too high during regeneration of the DPF, it may cause the properties of metals that are the substrate of the SCR to change or volatilize to cause air pollution.
Disclosure of Invention
The invention aims to provide a regeneration control method, which can avoid SCR damage caused by overhigh temperature of an SCR upstream due to abnormal DOC efficiency, judge the reason of overhigh temperature of the SCR at the moment because of abnormal DOC efficiency and facilitate subsequent detection and maintenance.
In order to achieve the purpose, the invention adopts the following technical scheme:
a regeneration control method comprising:
when the vehicle is in a regeneration oil injection stage and is in a first preset working condition during running regeneration of the vehicle, carrying out high-temperature fault detection and DOC efficiency detection, and judging a detection result;
the high temperature fault detection includes monitoring whether an SCR upstream temperature is above a first setpoint;
the DOC efficiency detection comprises integrating the DPF upstream temperature and the SCR upstream temperature, and calculating the ratio of the difference between the integral value of the DPF upstream temperature and the integral value of the SCR upstream temperature to the integral value of the DPF upstream temperature;
the detection result judgment comprises that if the SCR upstream temperature is higher than a first set value, and the ratio of the difference between the integral value of the DPF upstream temperature and the integral value of the SCR upstream temperature to the integral value of the DPF upstream temperature is smaller than a second set value, the traveling regeneration is forbidden, and the DOC efficiency is judged to be abnormal.
Preferably, the first preset working condition is that the fuel injection quantity of the engine is greater than a second set value, the exhaust gas flow is greater than a third set value, and the upstream temperature of the DPF is greater than a fourth set value.
Preferably, the method further comprises the step of sending a parking regeneration prompting signal after the driving regeneration is forbidden.
Preferably, the DOC efficiency abnormality judgment further comprises sending a DOC efficiency abnormality fault signal.
Preferably, the determining of the detection result further includes:
and if the SCR upstream temperature is higher than a first preset value and the ratio of the difference between the integral value of the DPF upstream temperature and the integral value of the SCR upstream temperature to the integral value of the DPF upstream temperature is larger than a second set value, suspending the driving regeneration.
Preferably, the method further comprises the step of sending out a fault signal that the temperature of the SCR upstream is too high after the service regeneration is suspended.
Preferably, the method further comprises continuing the driving regeneration when the temperature upstream of the SCR is lower than a first preset value after the driving regeneration is suspended.
Preferably, the determining of the detection result further includes:
and if the upstream temperature of the SCR is not higher than the first set value, sending a driving regeneration completion signal after the driving regeneration is completed.
A regeneration control device for controlling a vehicle to perform aftertreatment system regeneration by using any one of the regeneration control methods.
A vehicle that performs aftertreatment system regeneration using the regeneration control method of any of the above.
The invention has the beneficial effects that:
the invention provides a regeneration control method, a regeneration control device and a vehicle. The high temperature fault detection includes monitoring whether a temperature upstream of the SCR is above a first setpoint. The DOC efficiency detection includes integrating the DPF upstream temperature and the SCR upstream temperature, and calculating a ratio of a difference between an integrated value of the DPF upstream temperature and an integrated value of the SCR upstream temperature to the integrated value of the DPF upstream temperature. The detection result judgment includes that if the SCR upstream temperature is higher than a first set value and the ratio of the difference between the integral value of the DPF upstream temperature and the integral value of the SCR upstream temperature to the integral value of the DPF upstream temperature is smaller than a second set value, the traveling regeneration is forbidden and the DOC efficiency is judged to be abnormal. Therefore, the SCR is prevented from being damaged due to overhigh temperature of the SCR upstream, and the reason that the SCR upstream temperature is overhigh is judged to be abnormal due to the DOC efficiency, so that the subsequent detection and maintenance are facilitated.
Drawings
Fig. 1 is a flowchart of a regeneration control method according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
As shown in fig. 1, the present embodiment provides a regeneration control method, which includes performing high-temperature fault detection and DOC efficiency detection when a vehicle enters an RGN stage (regeneration injection stage) and is in a first preset working condition during vehicle driving regeneration, and determining a detection result. The high temperature fault detection includes monitoring whether a temperature upstream of the SCR is above a first setpoint. The DOC efficiency detection includes integrating the DPF upstream temperature and the SCR upstream temperature, and calculating a ratio of a difference between an integrated value of the DPF upstream temperature and an integrated value of the SCR upstream temperature to the integrated value of the DPF upstream temperature. The detection result judgment includes that if the SCR upstream temperature is higher than a first set value and the ratio of the difference between the integral value of the DPF upstream temperature and the integral value of the SCR upstream temperature to the integral value of the DPF upstream temperature is smaller than a second set value, the traveling regeneration is forbidden and the DOC efficiency is judged to be abnormal.
According to the regeneration control method provided by the embodiment, when the temperature of the SCR upstream is higher than a first set value, and the ratio of the difference between the integral value of the temperature of the DPF upstream and the integral value of the temperature of the SCR upstream to the integral value of the temperature of the DPF upstream is smaller than a second set value, the traveling regeneration is prohibited, namely, the traveling regeneration is not performed in the driving cycle, so that the SCR is prevented from being damaged due to the overhigh temperature of the SCR, and the subsequent maintenance and detection are facilitated by judging that the efficiency of the DOC is abnormal because of the overhigh temperature of the SCR. And in the RGN stage, the vehicle injects oil into the DOC, so that the oil is oxidized in the DOC to release heat so as to improve the temperature of tail gas, and then carbon deposit in the DPF is burnt out through high-temperature tail gas to complete the regeneration of the DPF. When the efficiency of the DOC is too low, oil is not completely oxidized in the DOC, part of the oil enters the DPF, and heat is released by continuous oxidation in the DPF, so that the temperature at the downstream of the DPF, namely the upstream of the SCR, is too high, and the difference between the temperature at the upstream of the DPF and the temperature at the upstream of the SCR is smaller than the theoretical value when the oil is completely oxidized in the DOC. Therefore, a theoretical value of the ratio of the difference between the integrated value of the temperature upstream of the DPF and the integrated value of the temperature upstream of the SCR to the integrated value of the temperature upstream of the DPF, that is, a second set value, can be set based on the theoretical value of the difference between the temperature upstream of the DPF and the temperature upstream of the SCR when the oil is completely oxidized in the DOC, and if the difference between the temperature upstream of the DPF and the temperature upstream of the SCR is smaller than the ratio of the difference between the integrated value of the temperature upstream of the DPF and the integrated value of the temperature upstream of the SCR to the integrated value of the temperature upstream of the DPF is smaller than the second set value when the temperature upstream of the SCR is excessively high, it can be determined that the cause of the excessively high temperature upstream of the SCR is abnormal DOC efficiency based on this. And the ratio of the difference between the integral value of the DPF upstream temperature and the integral value of the SCR upstream temperature to the integral value of the DPF upstream temperature is used as a judgment basis, so that the misjudgment caused by transient data fluctuation of the sensor can be effectively avoided, and the judgment basis is not influenced by the duration of the RGN stage.
Optionally, as shown in fig. 1, before the vehicle driving regeneration, it is further determined that the entire vehicle and the aftertreatment system are operating normally, and the vehicle driving regeneration is performed when the vehicle generates a regeneration request.
Alternatively, as shown in fig. 1, the first preset operating condition is that the fuel injection amount of the engine is greater than a second set value, the exhaust gas flow rate is greater than a third set value, and the temperature upstream of the DPF is greater than a fourth set value. The engine oil injection amount is larger than a second set value, the exhaust gas flow is larger than a third set value, and the DPF upstream temperature is larger than a fourth set value, so that the RGN stage enters a stable state, the DPF upstream temperature and the SCR upstream temperature tend to be stable, and the DOC efficiency detection is performed at the moment, so that the accuracy of the DOC efficiency detection can be improved.
Optionally, as shown in fig. 1, after the driving regeneration is prohibited, a parking regeneration prompting signal is sent to prompt a client that the driving regeneration fails, and the client is required to perform the parking regeneration at a proper time to avoid the exhaust emission of the vehicle exceeding the standard. The vehicle control system controls the temperature upstream of the SCR during parking regeneration, so as to avoid the problem of excessive temperature upstream of the SCR.
Optionally, as shown in fig. 1, after determining that the DOC efficiency is abnormal, sending a DOC efficiency abnormality prompting signal is further included, and sending a DOC efficiency abnormality fault signal to the customer to prompt that the reason that the temperature of the SCR upstream of the customer is too high is that the DOC efficiency is abnormal.
Optionally, as shown in fig. 1, the determining of the detection result further includes suspending the traveling regeneration and avoiding damaging the SCR due to the excessively high SCR upstream temperature if the SCR upstream temperature is higher than a first preset value and the ratio of the difference between the integral value of the DPF upstream temperature and the integral value of the SCR upstream temperature to the integral value of the DPF upstream temperature is greater than a second preset value, which indicates that there is no abnormality in DOC efficiency.
Optionally, as shown in fig. 1, after suspending the driving regeneration, the method further comprises sending a fault signal of the SCR upstream temperature, so as to prompt the client vehicle that the fault of the SCR upstream temperature is too high.
Optionally, as shown in fig. 1, suspending the driving regeneration further comprises continuing the driving regeneration when the temperature upstream of the SCR is lower than a first preset value. Due to the fact that the DOC efficiency is not abnormal, driving regeneration is continued after the temperature of the SCR upstream is reduced to be lower than a first preset value, and therefore the exhaust emission of a vehicle is prevented from exceeding the standard.
Optionally, as shown in fig. 1, the determining of the detection result further includes sending a driving regeneration completion signal after the driving regeneration is completed if the SCR upstream temperature is not higher than the first set value.
The present embodiment also provides a regeneration control device that performs regeneration using the regeneration control method described above.
The present embodiment also provides a vehicle that performs regeneration using the regeneration control method described above.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A regeneration control method, characterized by comprising:
when the vehicle is in a regeneration oil injection stage and is in a first preset working condition during running regeneration of the vehicle, carrying out high-temperature fault detection and DOC efficiency detection, and judging a detection result;
the high temperature fault detection includes monitoring whether a temperature upstream of the SCR is above a first set point;
the DOC efficiency detection comprises integrating the DPF upstream temperature and the SCR upstream temperature, and calculating the ratio of the difference between the integral value of the DPF upstream temperature and the integral value of the SCR upstream temperature to the integral value of the DPF upstream temperature;
the detection result judgment comprises the steps of forbidding travelling regeneration and judging that the DOC efficiency is abnormal if the SCR upstream temperature is higher than a first set value and the ratio of the difference of the integral value of the DPF upstream temperature and the integral value of the SCR upstream temperature to the integral value of the DPF upstream temperature is smaller than a second set value.
2. The regeneration control method of claim 1, wherein the first predetermined condition is engine fuel injection greater than a second set point, exhaust gas flow greater than a third set point, and DPF upstream temperature greater than a fourth set point.
3. The regeneration control method according to claim 1, further comprising issuing a parking regeneration prompting signal after the traveling regeneration is prohibited.
4. The regeneration control method of claim 3, wherein determining that the DOC efficiency is abnormal further comprises signaling a DOC efficiency abnormality fault.
5. The regeneration control method according to claim 1, wherein the detection result determination further includes:
and if the SCR upstream temperature is higher than a first preset value and the ratio of the difference between the integral value of the DPF upstream temperature and the integral value of the SCR upstream temperature to the integral value of the DPF upstream temperature is larger than a second set value, suspending the driving regeneration.
6. The regeneration control method of claim 5, further comprising signaling an excessive SCR upstream temperature fault after suspending service regeneration.
7. The regeneration control method of claim 5, further comprising continuing the regeneration when the SCR upstream temperature is below a first predetermined value after suspending the regeneration.
8. The regeneration control method according to claim 1, wherein the detection result determination further includes:
and if the upstream temperature of the SCR is not higher than the first set value, sending a driving regeneration completion signal after the driving regeneration is completed.
9. A regeneration control apparatus for controlling a vehicle to perform aftertreatment system regeneration by using the regeneration control method according to any one of claims 1 to 8.
10. A vehicle characterized by performing aftertreatment system regeneration using the regeneration control method according to any one of claims 1 to 8.
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