CN112664301A - DPF active regeneration method - Google Patents
DPF active regeneration method Download PDFInfo
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- CN112664301A CN112664301A CN202011543943.0A CN202011543943A CN112664301A CN 112664301 A CN112664301 A CN 112664301A CN 202011543943 A CN202011543943 A CN 202011543943A CN 112664301 A CN112664301 A CN 112664301A
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- vehicle speed
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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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 discloses a DPF active regeneration method, which belongs to the technical field of vehicles and comprises the following steps: the control unit monitors the vehicle speed and the DPF carbon loading capacity of the vehicle in real time, and controls the oxidation type catalytic converter to execute a regeneration function when the vehicle speed meets a high-speed working condition and the DPF carbon loading capacity meets a regeneration condition; the high-speed working condition comprises the following steps: in the past first set time, the vehicle speed is always greater than or equal to a first vehicle speed threshold value, and the average vehicle speed is greater than or equal to a second vehicle speed threshold value; in the past second set time, the passing vehicle speed is less than or equal to a third vehicle speed threshold, the second set time is greater than the first set time, the third vehicle speed threshold is less than or equal to the first vehicle speed threshold, at the moment, the vehicle is in a high-speed working condition and is just driven to an expressway, an active regeneration function is automatically triggered, the active regeneration time can be ensured to be long enough, the carbon loading capacity of the DPF is reduced to a reasonable level, hardware is not required to be added, the cost is low, energy conservation and emission reduction can be realized, and the problem of high regeneration risk in urban and suburban working conditions is solved.
Description
Technical Field
The invention belongs to the technical field of vehicles, and particularly relates to an active regeneration method of a DPF.
Background
With the implementation of the national six-emission regulation, Particulate matter emission is an important requirement item for gasoline engine emission, and a DPF (Diesel Particulate Filter) is generally added to an exhaust system for physically filtering and trapping carbon particles in exhaust gas to reduce the soot emission of the exhaust gas. The back pressure of an exhaust pipe is increased along with the accumulation of the accumulated amount of the particulate matters, so that the oil consumption of the engine is increased; in addition, excessive soot formation may also increase the amount of heat released by the combustion of the soot at high temperatures in the exhaust system, possibly resulting in DPF damage. Therefore, timely cleaning of the carbon deposit on the DPF is beneficial to saving oil of an engine and self safety protection of parts, when the carbon deposit on the DPF is high in post-treatment, the carbon deposit needs to be oxidized into carbon dioxide through active regeneration, a DOC (Diesel Oxidation Catalyst) is generally arranged at the upstream of the DPF, Diesel oil is sprayed into an exhaust pipe to oxidize the carbon deposit into carbon dioxide, and meanwhile, the exhaust temperature is raised to about 600 ℃ through heat release.
However, the active regeneration function is performed under urban and suburban conditions, and the following risks exist:
1) the parking in urban areas and suburbs is frequent, and if the engine suddenly drops to idle speed in the regeneration process, the risk of burning the DPF is greatly increased;
2) the working conditions of urban areas and suburbs are low in load and frequent in parking, so that the whole exhaust temperature is low and fluctuates greatly, more diesel oil needs to be consumed to maintain the target temperature (about 600 ℃) of active regeneration, and the economical efficiency is poor.
In summary, it is desirable to enter the active regeneration function at high speed conditions. Therefore, a strategy and method for automatically recognizing high-speed road conditions and triggering active regeneration timely is needed.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the DPF active regeneration method can automatically identify high-speed working conditions and trigger an active regeneration function in due time, is low in cost, and can realize energy conservation and emission reduction and reduce risks.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a method of active regeneration of a DPF comprising: the control unit monitors the vehicle speed and the DPF carbon loading capacity of a vehicle in real time, and controls the oxidation type catalytic converter to execute a regeneration function when the vehicle speed meets a high-speed working condition and the DPF carbon loading capacity meets a regeneration condition; the high-speed working condition comprises the following steps: in the past first set time, the vehicle speed is always greater than or equal to a first vehicle speed threshold value, and the average vehicle speed is greater than or equal to a second vehicle speed threshold value; and in the past second set time, the vehicle speed is less than or equal to a third vehicle speed threshold, the second set time is greater than the first set time, and the third vehicle speed threshold is less than or equal to the first vehicle speed threshold.
Further, the regeneration condition is that the DPF carbon loading is greater than or equal to a first carbon loading threshold and less than or equal to a second carbon loading threshold.
Further, when the carbon loading of the DPF is smaller than a third carbon loading threshold value, the control unit controls the oxidation type catalyst to exit the regeneration function.
Further, the control unit controls the oxidation catalyst to interrupt the regeneration function when the vehicle is turned off or in an idle state.
Further, when the carbon loading amount of the DPF is greater than or equal to a fourth carbon loading amount threshold, the control unit sends a parking regeneration prompt, and the fourth carbon loading amount threshold is greater than or equal to the second carbon loading amount threshold.
Further, the control unit performs a regeneration function when the DPF carbon loading is greater than or equal to a fourth carbon loading threshold, which is greater than or equal to the second carbon loading threshold.
Further, the vehicle speed is calculated by the control unit according to input data of a gearbox output shaft sensor.
Further, the vehicle speed is input into the control unit through a meter detection unit.
After the technical scheme is adopted, the invention has the beneficial effects that:
the DPF active regeneration method comprises the following steps: the control unit monitors the vehicle speed and the DPF carbon loading capacity of the vehicle in real time, and controls the oxidation type catalytic converter to execute a regeneration function when the vehicle speed meets a high-speed working condition and the DPF carbon loading capacity meets a regeneration condition; the high-speed working condition comprises the following steps: in the past first set time, the vehicle speed is always greater than or equal to a first vehicle speed threshold value, and the average vehicle speed is greater than or equal to a second vehicle speed threshold value; in the past second set time, the passing vehicle speed is smaller than or equal to a third vehicle speed threshold, the second set time is larger than the first set time, the third vehicle speed threshold is smaller than or equal to the first vehicle speed threshold, the high-speed working condition can be automatically identified and the vehicle is just driven to an expressway, at the moment, the active regeneration function is triggered, the active regeneration time can be ensured to be long enough, the carbon loading capacity of the DPF is reduced to a reasonable level, hardware does not need to be added, the cost is low, energy conservation and emission reduction can be realized, and the problem of high regeneration risk in urban and suburban working conditions is avoided.
Drawings
FIG. 1 is a logic flow diagram of the DPF active regeneration method of the present invention.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
All directions referred to in the present specification are based on the drawings, and represent relative positional relationships only, and do not represent absolute positional relationships.
As shown in fig. 1, a method for active regeneration of a DPF comprises: and the control unit ECU monitors the vehicle speed v and the DPF carbon loading amount m of the vehicle in real time, and controls the oxidation type catalytic converter to execute a regeneration function when the vehicle speed v meets a high-speed working condition and the DPF carbon loading amount m meets a regeneration condition. The high-speed working condition comprises the following steps: in the past first set time t1, the vehicle speed v is always greater than or equal to the first vehicle speed threshold value v1, the average vehicle speed v0 is greater than or equal to the second vehicle speed threshold value v2, and the average vehicle speed v0 is calculated by the control unit ECU according to the vehicle speed v; and in the past second set time t2, the overtaking speed v is less than or equal to the third vehicle speed threshold value v3, the second set time t2 is greater than the first set time t1, and the third vehicle speed threshold value v3 is less than or equal to the first vehicle speed threshold value v 1. When the vehicle speed v meets the three conditions, the vehicle can be judged to be in a high-speed working condition and just driven to an expressway. The above values can be set according to engineering experience, wherein the first set time t1 can be 10min, the second set time t2 can be 12 min-15 min, v1 can be 55km/h, v2 can be 70km/h, and v3 can be 20 km/h.
As shown in fig. 1, the regeneration conditions are that the DPF carbon loading m is greater than or equal to a first carbon loading threshold m1 and less than or equal to a second carbon loading threshold m 2. The first carbon loading threshold m1 and the second carbon loading threshold m2 can be flexibly set according to engineering experience, the carbon loading m of the DPF is obtained by the control unit ECU according to model calculation, the specific calculation method is the prior art, and details are not repeated here. Wherein the first carbon loading threshold m1 may be 3.0g/L and the second carbon loading threshold m2 may be 3.5 g/L.
As shown in fig. 1, when the DPF carbon loading m is less than the third carbon loading threshold m3, the control unit ECU controls the oxidation catalyst to exit the regeneration function, and the regeneration function is ended, and the third carbon loading threshold m3 may be 0.2 gL. Whether regeneration is quitted or not can be judged according to the working conditions of the whole vehicle and the engine, if the vehicle is flamed out or is in an idling state, the control unit ECU controls the oxidation type catalytic converter to interrupt the regeneration function, and the phenomenon that nearby devices are burnt out due to overhigh temperature in the exhaust pipe is avoided. When the vehicle speed v returns to normal, the control unit ECU can control the oxidation type catalytic converter to continue to enter the active regeneration function, and can also enter the active regeneration function again when the vehicle speed v meets the high-speed working condition and the DPF carbon loading amount m meets the regeneration condition.
The vehicle speed v can be calculated by the control unit ECU according to the input data of the output shaft sensor of the gearbox, and can also be calculated by the instrument detection unit and then input into the control unit ECU.
When the carbon loading m of the DPF is larger than or equal to the fourth carbon loading threshold m4, the control unit ECU sends a parking regeneration prompt, or the control unit ECU executes a regeneration function, the fourth carbon loading threshold m4 is larger than or equal to the second carbon loading threshold m2, and whether the vehicle is in a high-speed working condition or not does not need to be judged according to the vehicle speed v. The fourth carbon loading threshold m4 is set according to engineering experience and can be 3.5 g/L-4.5 g/L.
According to the DPF active regeneration method, the vehicle speed and the DPF carbon loading amount of the vehicle are monitored in real time through the control unit, when the vehicle speed meets the high-speed working condition and the DPF carbon loading amount meets the regeneration condition, the control unit controls the oxidation type catalytic converter to execute the regeneration function, the high-speed working condition can be automatically identified, the active regeneration function is automatically triggered just before the vehicle is driven to a highway, the cost is low, energy conservation and emission reduction can be achieved, and the problem of high regeneration risk under the working conditions in urban areas and suburbs is solved.
While specific embodiments of the invention have been described above, it will be understood by those skilled in the art that the described embodiments are only some, and not all, of the present invention, which is presented by way of example only, and the scope of the invention is defined by the appended claims. Various changes or modifications to these embodiments may be made by those skilled in the art without departing from the principle and spirit of the invention, and these changes and modifications all fall within the scope of the invention.
Claims (8)
1. A method of active regeneration of a DPF comprising:
the control unit monitors the vehicle speed and the DPF carbon loading capacity of a vehicle in real time, and controls the oxidation type catalytic converter to execute a regeneration function when the vehicle speed meets a high-speed working condition and the DPF carbon loading capacity meets a regeneration condition;
the high-speed working condition comprises the following steps:
in the past first set time, the vehicle speed is always greater than or equal to a first vehicle speed threshold value, and the average vehicle speed is greater than or equal to a second vehicle speed threshold value;
and in the past second set time, the vehicle speed is less than or equal to a third vehicle speed threshold, the second set time is greater than the first set time, and the third vehicle speed threshold is less than or equal to the first vehicle speed threshold.
2. The method of active regeneration of a DPF of claim 1, wherein the regeneration condition is the DPF carbon loading being greater than or equal to a first carbon loading threshold and less than or equal to a second carbon loading threshold.
3. The DPF active regeneration method of claim 1, wherein the control unit controls the oxidation catalyst to exit a regeneration function when the DPF carbon loading is less than a third carbon loading threshold.
4. The DPF active regeneration method of claim 1, wherein the control unit controls the oxidation catalyst to interrupt a regeneration function when the vehicle is turned off or in an idle state.
5. The DPF active regeneration method of claim 2, wherein the control unit issues a parking regeneration prompt when the DPF carbon loading is greater than or equal to a fourth carbon loading threshold, the fourth carbon loading threshold being greater than or equal to the second carbon loading threshold.
6. The DPF active regeneration method of claim 2, wherein the control unit performs a regeneration function when the DPF carbon loading is greater than or equal to a fourth carbon loading threshold, which is greater than or equal to the second carbon loading threshold.
7. A method of active DPF regeneration as defined in any one of claims 1 to 6 wherein said vehicle speed is calculated by said control unit from transmission output shaft sensor input data.
8. The DPF active regeneration method according to any one of claims 1 to 6, wherein the vehicle speed is inputted to the control unit by an instrument detection unit.
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| CN202011543943.0A CN112664301B (en) | 2020-12-23 | 2020-12-23 | DPF active regeneration method |
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| CN202011543943.0A CN112664301B (en) | 2020-12-23 | 2020-12-23 | DPF active regeneration method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113177314A (en) * | 2021-04-28 | 2021-07-27 | 一汽解放汽车有限公司 | DPF active regeneration method and device, computer equipment and storage medium |
| CN114776419A (en) * | 2022-05-10 | 2022-07-22 | 潍柴动力股份有限公司 | DPF regeneration control method and system, vehicle and storage medium |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113177314A (en) * | 2021-04-28 | 2021-07-27 | 一汽解放汽车有限公司 | DPF active regeneration method and device, computer equipment and storage medium |
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