CN109944663B - Post-processing system control method and device - Google Patents

Post-processing system control method and device Download PDF

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CN109944663B
CN109944663B CN201910184490.8A CN201910184490A CN109944663B CN 109944663 B CN109944663 B CN 109944663B CN 201910184490 A CN201910184490 A CN 201910184490A CN 109944663 B CN109944663 B CN 109944663B
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pna
heater
aftertreatment system
temperature
post
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CN109944663A (en
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王晓华
张瑜
王东升
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Weichai Power Co Ltd
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Weichai Power Co Ltd
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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
    • 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 post-treatment system control method and a device, which are applied to the technical field of automobiles, wherein the system comprises a PNA, a first heater arranged at a PNA air inlet, and a second heater arranged at a PNA air outlet, the method firstly obtains a characteristic parameter representing the operation condition of the post-treatment system, and if the post-treatment system is judged to be in the operation condition that the exhaust temperature of the PNA air outlet should be improved according to the characteristic parameter, the first heater is controlled to be in a closed state, and the second heater is started at the same time; and if the aftertreatment system is judged to be in the operation condition that the exhaust temperature of the PNA air inlet is required to be increased according to the characteristic parameters, controlling the first heater to be in the opening state. The heaters are respectively arranged at the air inlet and the air outlet of the PNA, the active control of the working state of the PNA is realized by controlling the heaters, the PNA is matched with other post-treatment components in a post-treatment system, and NO is improvedxThe treatment effect of the gas.

Description

Post-processing system control method and device
Technical Field
The invention belongs to the technical field of automobiles, and particularly relates to a control method and device of an aftertreatment system.
Background
In the diesel aftertreatment system, PNA (Passive NO) is mostly provided at an upstream portionxAbsorber，NOxAdsorber) capable of adsorbing NO at low temperature using PNAxGas and release adsorbed NO at high temperaturexCharacteristics of gas, ultra Low NOxAnd controlling gas emission.
In order to improve the treatment effect of the aftertreatment system on the engine exhaust, a Selective Catalytic Reduction (SCR), a Diesel Particulate Filter (DPF), a Diesel Oxidation Catalyst (DOC), and other components are generally disposed downstream of the PNA and used in cooperation with the PNA.
In the prior art, for the aftertreatment system provided with the PNA, the working state of the PNA is completely dependent on the temperature of the exhaust gas flowing through the PNA, and the processes of adsorbing and desorbing the NOx gas are not controllable, so that the NOx-gas treatment effect is poor.
Disclosure of Invention
It is therefore an object of the present invention to provide a post-processing systemA system control method and device, which can actively control the working state of PNA and improve NOxThe specific scheme of the treatment effect of the gas is as follows:
in a first aspect, the present invention provides a method for controlling an aftertreatment system, the aftertreatment system comprising: NOxAdsorber PNA, set up in the first heater of PNA air inlet, and set up in the second heater of PNA gas outlet, the control method includes:
after the vehicle is started, acquiring characteristic parameters representing the operation condition of the post-processing system;
if the aftertreatment system is judged to be in the operation condition that the exhaust temperature of the PNA air outlet is required to be increased according to the characteristic parameters, the first heater is controlled to be in a closed state, and the second heater is started;
and if the aftertreatment system is in the operation condition that the exhaust temperature of the PNA air inlet is required to be increased according to the characteristic parameters, controlling the first heater to be in the on state.
Optionally, the operation condition that the exhaust temperature of the PNA outlet should be increased includes: and (5) cold starting working condition of the engine.
Optionally, the operation condition that the exhaust temperature of the PNA inlet should be increased includes:
the selective catalytic reduction device SCR arranged in the aftertreatment system is in a high-efficiency working temperature range, the SCR sends a desulfurization request, and the diesel particulate filter DPF arranged in the aftertreatment system sends an active regeneration request or a passive regeneration request.
Optionally, when it is determined that the aftertreatment system is in an operating condition where the exhaust temperature at the outlet of the PNA is to be increased according to the characteristic parameter, the method for controlling the aftertreatment system according to the first aspect of the present invention further includes:
acquiring the exhaust temperature of the aftertreatment system;
and if the exhaust temperature of the aftertreatment system reaches a preset temperature threshold, closing the second heater.
Optionally, in a case where it is determined that the aftertreatment system is in an operating condition where the DPF sends a passive regeneration request, the controlling the first heater to be in an on state includes:
controlling the first heater to be in an on state for a first period of time, wherein the first period of time is determined according to a time required for the PNA to release the adsorbed NOx gas and an intake air temperature of the DPF.
Optionally, the post-processing system further includes: gather PNA air inlet exhaust temperature's first temperature sensor and collection PNA gas outlet exhaust temperature's second temperature sensor, judge aftertreatment system is in the SCR is in the condition of the interval operating condition of high-efficient operating temperature, control first heater is in the on-state, includes:
controlling the first heater to be in an on state for a second period of time, wherein the second period of time is determined based on the measurement value of the first temperature sensor, the measurement value of the second temperature sensor, and the amount of adsorption of NOx gas in the PNA.
Optionally, in a case where it is determined that the aftertreatment system is in an operating condition where the SCR makes a desulfurization request or the DPF makes an active regeneration request, the controlling the first heater to be in an on state includes:
controlling the first heater to be in an on state for a third period of time, wherein the third period of time is determined based on a measurement of the first temperature sensor.
Optionally, in the aftertreatment system control method according to any of the above aspects of the invention, the first heater includes a burner or an electric heater, and the second heater includes a burner or an electric heater.
In a second aspect, the present invention provides an aftertreatment system control device, the aftertreatment system including: NOx adsorber PNA, a first heater provided at the inlet of said PNA, and a second heater provided at the outlet of said PNA, said control device comprising:
the first acquisition unit is used for acquiring characteristic parameters representing the operation condition of the post-processing system after the vehicle is started;
the first control unit is used for judging that the aftertreatment system is in an operation condition that the exhaust temperature of the PNA air outlet is required to be increased according to the characteristic parameters, controlling the first heater to be in a closed state and starting the second heater;
and the second control unit is used for judging that the aftertreatment system is in an operation condition that the exhaust temperature of the PNA air inlet is required to be increased according to the characteristic parameters and controlling the first heater to be in an on state.
Optionally, the aftertreatment system control device according to the second aspect of the invention further includes:
a second acquisition unit for acquiring an exhaust temperature of the aftertreatment system;
and the third control unit is used for turning off the second heater if the exhaust temperature of the aftertreatment system reaches a preset temperature threshold value.
Based on the technical scheme, the post-treatment system comprises a PNA, a first heater arranged at a PNA air inlet, and a second heater arranged at a PNA air outlet, wherein the control method is realized based on the post-treatment system, the control method firstly acquires a characteristic parameter representing the operation condition of the post-treatment system, then judges the operation condition of the post-treatment system according to the acquired characteristic parameter, and controls the first heater to be in a closed state and simultaneously starts the second heater if the post-treatment system is judged to be in the operation condition that the exhaust temperature of the PNA air outlet should be increased, so that the PNA can effectively adsorb NO without influencing the internal temperature of the PNAxOn the premise of gas, the exhaust temperature of the PNA gas outlet is increased, so that components at the downstream of the PNA can be exhausted at higher temperature, and corresponding functions can be better realized; if the aftertreatment system is judged to be in the operation working condition that the exhaust temperature of the PNA air inlet needs to be increased, the first heater is controlled to be in the on state, the temperature entering the PNA is rapidly increased, and the release of adsorbed NO by the PNA is acceleratedxGas processing to make more NO available to post-processing components downstream of PNAxGas, while enhancing exhaust gas to aftertreatment components downstream of the PNAThe temperature further improves the working effect of the corresponding post-processing component. According to the control method of the post-treatment system provided by the invention, the heaters are respectively arranged at the air inlet and the air outlet of the PNA, the active control on the working state of the PNA is realized by controlling the heaters, the PNA is matched with other post-treatment components in the post-treatment system, the function of the PNA can be fully exerted, and the NO is improvedxThe treatment effect of the gas.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a block diagram of an aftertreatment system provided by an embodiment of the invention;
FIG. 2 is a flow chart of a method for controlling an aftertreatment system according to an embodiment of the invention;
FIG. 3 is a block diagram of an aftertreatment system control device according to an embodiment of the invention;
fig. 4 is a block diagram of another aftertreatment system control device according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a block diagram of an exemplary post-processing system, which includes a PNA, in accordance with the present invention: the first heater 10, the second heater 20, the first temperature sensor 30, the second temperature sensor 40, and the PNA50 are not specifically shown in the drawings for other components disposed downstream of the PNA in the aftertreatment system, such as DOC, DPF, SCR, etc., but are represented by other components 60, which is not limited by the embodiment of the invention.
The first heater 10 and the first temperature sensor 30 are both arranged at the air inlet of the PNA, wherein when the first heater 10 is turned on, the tail gas flowing through the air inlet of the PNA can be heated, and the exhaust temperature entering the PNA is increased; the first temperature sensor 30 is used to measure the exhaust gas temperature at the inlet of the PNA.
The second heater 20 and the second temperature sensor 40 are both arranged at the gas outlet of the PNA, wherein when the second heater 20 is turned on, the tail gas flowing out from the gas outlet of the PNA can be heated to increase the exhaust temperature at the downstream of the PNA; a second temperature sensor 40 is used to measure the exhaust gas temperature at the outlet of the PNA.
Alternatively, the first heater may be a burner or an electric heater, and likewise, the second heater may be a burner or an electric heater. It is contemplated that, to simplify the control logic and improve product consistency, the first and second heaters are preferably selected from the same type of heater, such as the first and second heaters are both selected from burners, or the first and second heaters are both selected from electric heaters.
Based on the above post-processing system, an embodiment of the present invention provides a method for controlling a post-processing system, referring to fig. 2, fig. 2 is a flowchart of the method for controlling a post-processing system according to the embodiment of the present invention, and the method may be applied to an on-board controller, which may be a controller with data processing capability, such as a vehicle computer, or may be a controller separately configured to control a vehicle post-processing system, and obviously, the controller may also be implemented by a server on a network side in some cases; referring to fig. 1, a method for controlling an aftertreatment system according to an embodiment of the present invention may include:
and S100, acquiring characteristic parameters representing the operation condition of the post-processing system after the vehicle is started.
After the vehicle is started, the post-processing system starts to work, and characteristic parameters representing the operation condition of the post-processing system can be obtained. The specific configurations of different post-processing systems may be different, and therefore, the characteristic parameters that can be obtained may also be different.
For example, for an aftertreatment system provided with an SCR, the characteristic parameters corresponding to the SCR may include an operating temperature of the SCR, a desulfurization request signal sent by the SCR, and the like; for an aftertreatment system with a DPF, the characteristic parameters corresponding to the DPF may include an intake air temperature and an outlet air temperature of the DPF, and an active regeneration request signal and a passive regeneration request signal issued by the DPF, an exhaust gas temperature of the aftertreatment system, and the like.
It should be noted that any characteristic parameter that can characterize the operating condition of the aftertreatment system is optional and falls within the scope of the embodiments of the present invention.
Step S110, judging whether the aftertreatment system is in an operation condition that the exhaust temperature of the PNA air outlet is required to be increased or not according to the characteristic parameters, and if so, executing step S120.
Optionally, in the cold start process of the engine, the exhaust temperatures of the engine and the whole aftertreatment system are low, and at this time, the PNA is in a low-temperature state to ensure that the PNA can adsorb NO in the exhaustxThe action of the gas. Therefore, the engine cold start working condition is one of the operating working conditions that the exhaust temperature of the PNA air outlet is required to be increased.
And step S120, controlling the first heater to be in a closed state, and turning on the second heater.
When the aftertreatment system is in the operation condition that the exhaust temperature of the PNA gas outlet is required to be increased, the internal part of the PNA is required to be kept in a low-temperature state, so that the PNA can play a role of adsorbing NOxThe gas functions, and at the same time, the exhaust temperature of the outlet of the PNA needs to be raised, so the first heater should be controlled to be in the off state, and the second heater should be turned on.
Taking the cold start working condition of the engine as an example, the first heater is in the off state, so that the internal part of the PNA can be ensuredIn a low temperature state, PNA can be fully used for adsorbing NOxAnd meanwhile, in order to improve the exhaust temperature at the downstream of the PNA as soon as possible, particularly in the aftertreatment system provided with the SCR, under the working condition of cold start of the engine, the SCR reducing agent injection system does not start to work, and the second heater is started, so that the exhaust temperature entering the SCR can be improved as soon as possible, and other aftertreatment components such as the SCR can be made to work as soon as possible.
Optionally, after the second heater is turned on to increase the temperature of the PNA downstream post-treatment system, the exhaust temperature of the post-treatment system may be obtained in real time or periodically, and when the exhaust temperature of the post-treatment system reaches a preset temperature threshold, the second heater may be turned off to stop heating. Specifically, there may be a plurality of settings for the aftertreatment system, such as an aftertreatment system including PNA + SCR, an aftertreatment system including PNA + DPF, etc., so that the determination of the temperature of the aftertreatment system is determined by the specific aftertreatment system configuration, and the temperature of the aftertreatment system is taken as the standard of the temperature of the entire aftertreatment system.
Step S130, judging whether the aftertreatment system is in the operation condition that the exhaust temperature of the PNA air inlet is required to be increased or not according to the characteristic parameters, and if so, executing step S140.
Optionally, the operation condition for increasing the exhaust temperature of the PNA inlet at least comprises: when the SCR is in the efficient operating temperature range, the SCR sends out the desulfurization request, and the DPF sends out the active regeneration request or the passive regeneration request, the step S140 may be executed instead when the aftertreatment system is in any one of the above operating conditions.
In step S140, the first heater is controlled to be in an on state.
When the aftertreatment system is in the operation condition that the exhaust temperature of the PNA air inlet is to be increased, the first heater is controlled to be in the opening state to heat the exhaust entering the PNA, and the temperature of the exhaust entering the PNA is increased.
Alternatively, when the DPF in the aftertreatment system issues a passive regeneration request, the DPF may require a higher NOxThe ratio/root (particulate matter emitted by the engine) to promote efficient passive regeneration, while maintaining the passive regeneration within a reasonable temperature range. When the aftertreatment system is in the working condition, the first heater needs to be controlled to be in an open state within a first time period, the PNA is prompted to release the adsorbed NOx gas, and NO at the upstream of the DPF is promotedxThe/root ratio, while increasing the temperature upstream of the DPF, promotes efficient passive regeneration. Specifically, the first period of time may be determined according to the time required for the PNA to release the adsorbed NOx gas, and the intake air temperature of the DPF.
Optionally, when the DPF sends a passive regeneration request, to promote a rapid rise in temperature upstream of the DPF, the second heater may also be turned on simultaneously, the first heater and the second heater heating the exhaust gas entering the DPF simultaneously. It should be noted that, the control of the start time of the second heater only depends on the temperature of the DPF inlet, and the second heater can be turned off after the temperature of the DPF inlet reaches the corresponding preset temperature threshold.
Alternatively, after the vehicle is started, the vehicle will enter a normal operation state from a cold start state as the engine exhaust temperature increases. Correspondingly, for an aftertreatment system with an SCR, the temperature of the SCR will also be in a temperature range where efficient operation can be performed, for example, around 300 ℃ (different SCRs may have slightly different temperature ranges where efficient operation is performed, which is not limited by the embodiment of the present invention), and the SCR can convert NO in exhaust gas by 100%xGas, at this time, the first heater can be controlled to be in an on state, the temperature of the PNA is raised, and the PNA releases adsorbed NOxGas to continue adsorbing NO in subsequent low temperature conditionsxGas to improve the utilization of PNA.
Further, the NO adsorbed by the PNA is heated by the first heater according to the inlet air temperature of the PNAxThe gas is released completely, so that the starting time of the first heater can be limited, the first heater is controlled to be started within the second time period, and the first heater is turned off after the second time period is finished. Alternatively, the second period of time may be based on a measurement of the first temperature sensorValue, measured value of the second temperature sensor, and NO in PNAxAnd determining the gas adsorption amount. It is noted that for PNA release adsorbed NOxThe calculation of the time used for the gas can be realized by adopting a calculation method in the prior art, and the specific method for calculating the second time period in the embodiment of the present invention is not limited, and of course, the second time period can also be preset according to an empirical value.
Alternatively, when the DPF makes an active regeneration request or the SCR makes a desulfation request, the DPF or SCR both require higher temperatures to perform effective active regeneration or desulfation. In both of these conditions, the PNA is required to maintain a higher temperature, and therefore, the first heater needs to be controlled to be on for a third period of time. Specifically, the setting of the third period of time may be determined based on the measurement value of the first temperature sensor. For example, when the measured value of the first temperature sensor is smaller than a first limit value, the first heater is turned on; and controlling the first heater to be turned off when the measurement value of the first temperature sensor is greater than the second limit.
In summary, in the post-treatment system control method provided by the embodiments of the present invention, the heaters are respectively disposed at the air inlet and the air outlet of the PNA, and the heaters are controlled to actively control the working state of the PNA, so that the PNA and other post-treatment components in the post-treatment system are matched with each other, the function of the PNA can be fully exerted, and the NO can be improvedxThe treatment effect of the gas.
Furthermore, the working efficiency of other post-treatment components in the post-treatment system can be effectively improved, so that the treatment effect of the post-treatment system on the exhaust gas is further improved.
It should be noted that, the determination of the aftertreatment operation condition and the corresponding control process in the embodiment of the present invention are only exemplary, and the corresponding execution sequence is not strictly limited, that is, the control processes of step S130 and step S140 may be located before step S110 and step S120, and first, the determination of whether the aftertreatment system is in the operation condition that the exhaust temperature of the PNA intake port should be increased is performed. However, it is conceivable that, in practical applications, the engine exhaust temperature will necessarily have a low-to-high change from the start-up to the normal running of the vehicle, and therefore, the sequence of steps given in the above embodiment is in accordance with the actual use of the vehicle.
Further, it is also contemplated that for conditions where it is not necessary to increase the engine exhaust temperature at the inlet of the PNA, and at the same time, it is not necessary to increase the engine exhaust temperature at the outlet of the PNA, that the first and second heaters be controlled to be in the off state at the same time.
The following introduces a post-processing system control apparatus provided in the embodiment of the present invention, and the post-processing system control apparatus described below may be regarded as a functional module architecture that needs to be set in a central device to implement the post-processing system control method provided in the embodiment of the present invention; the following description may be cross-referenced with the above.
Fig. 3 is a block diagram of an aftertreatment system control apparatus according to an embodiment of the present invention, and referring to fig. 3, the apparatus may include:
the first obtaining unit 10 is used for obtaining characteristic parameters representing the operation conditions of the post-processing system after the vehicle is started;
the first control unit 20 is configured to determine that the aftertreatment system is in an operation condition where the exhaust temperature of the PNA gas outlet should be increased according to the characteristic parameter, control the first heater to be in a closed state, and turn on the second heater;
and the second control unit 30 is configured to determine that the aftertreatment system is in an operation condition where the exhaust temperature of the PNA intake port should be increased according to the characteristic parameter, and control the first heater to be in an on state.
Optionally, referring to fig. 4, fig. 4 is a block diagram of another post-processing system control device according to an embodiment of the present invention, and on the basis of the embodiment shown in fig. 3, the device further includes:
a second acquisition unit 40 for acquiring an exhaust temperature of the aftertreatment system;
a third control unit 50, configured to turn off the second heater if the exhaust temperature of the aftertreatment system reaches a preset temperature threshold.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (8)

1. An aftertreatment system control method, the aftertreatment system comprising: NOxAdsorber PNA, set up in the first heater of PNA air inlet, and set up in the second heater of PNA gas outlet, the control method includes:
after the vehicle is started, acquiring characteristic parameters representing the operation condition of the post-processing system;
if the aftertreatment system is judged to be in the operation condition that the exhaust temperature of the PNA air outlet is required to be increased according to the characteristic parameters, the first heater is controlled to be in a closed state, and the second heater is started;
if the aftertreatment system is judged to be in the operation condition that the exhaust temperature of the PNA air inlet is required to be increased according to the characteristic parameters, the first heater is controlled to be in the opening state, wherein,
the operation condition for increasing the exhaust temperature of the PNA air inlet comprises the following steps: the selective catalytic reduction device (SCR) arranged in the post-treatment system is in a high-efficiency working temperature range, the SCR sends a desulfurization request, and the Diesel Particulate Filter (DPF) arranged in the post-treatment system sends an active regeneration request or a passive regeneration request;
in a case where it is determined that the aftertreatment system is in an operating condition where the DPF issues a passive regeneration request, the controlling the first heater to be in an on state includes:
controlling the first heater to be in an on state for a first period of time, wherein the first period of time is determined according to a time required for the PNA to release the adsorbed NOx gas and an intake air temperature of the DPF.
2. The aftertreatment system control method of claim 1, wherein the operating condition that increases the PNA outlet gas temperature comprises: and (5) cold starting working condition of the engine.
3. The aftertreatment system control method of claim 1, wherein in a case where the aftertreatment system is determined to be in an operating condition in which the PNA outlet exhaust gas temperature should be increased based on the characteristic quantity, the method further comprises:
acquiring the exhaust temperature of the PNA gas outlet in the aftertreatment system;
and if the exhaust temperature of the PNA gas outlet reaches a preset temperature threshold value, closing the second heater.
4. The aftertreatment system control method of claim 1, wherein the aftertreatment system further comprises: gather PNA air inlet exhaust temperature's first temperature sensor and collection PNA gas outlet exhaust temperature's second temperature sensor, judge aftertreatment system is in the SCR is in the condition of the interval operating condition of high-efficient operating temperature, control first heater is in the on-state, includes:
controlling the first heater to be in an on state for a second period of time, wherein the second period of time is determined based on the measurement value of the first temperature sensor, the measurement value of the second temperature sensor, and the amount of adsorption of NOx gas in the PNA.
5. The aftertreatment system control method of claim 4, wherein the controlling the first heater to be in an on state in a case where it is determined that the aftertreatment system is in an operating condition where the SCR makes a request for desulfurization or the DPF makes a request for active regeneration comprises:
controlling the first heater to be in an on state for a third period of time, wherein the third period of time is determined based on a measurement of the first temperature sensor.
6. The aftertreatment system control method of any one of claims 1-5, wherein the first heater comprises a burner or an electric heater and the second heater comprises a burner or an electric heater.
7. An aftertreatment system control device, the aftertreatment system comprising: NOx adsorber PNA, a first heater provided at the inlet of said PNA, and a second heater provided at the outlet of said PNA, said control device comprising:
the first acquisition unit is used for acquiring characteristic parameters representing the operation condition of the post-processing system after the vehicle is started;
the first control unit is used for judging that the aftertreatment system is in an operation condition that the exhaust temperature of the PNA air outlet is required to be increased according to the characteristic parameters, controlling the first heater to be in a closed state and starting the second heater;
a second control unit, configured to determine that the aftertreatment system is in an operation condition where the exhaust temperature of the PNA intake port should be increased according to the characteristic parameter, and control the first heater to be in an on state, where the operation condition where the exhaust temperature of the PNA intake port should be increased includes: the selective catalytic reduction device (SCR) arranged in the post-treatment system is in a high-efficiency working temperature range, the SCR sends a desulfurization request, and the Diesel Particulate Filter (DPF) arranged in the post-treatment system sends an active regeneration request or a passive regeneration request;
when it is determined that the aftertreatment system is in an operating condition where the DPF sends a passive regeneration request, the second control unit is configured to control the first heater to be in an on state, and specifically includes:
controlling the first heater to be in an on state for a first period of time, wherein the first period of time is determined according to a time required for the PNA to release the adsorbed NOx gas and an intake air temperature of the DPF.
8. The aftertreatment system control device of claim 7, further comprising:
the second acquisition unit is used for acquiring the exhaust temperature of the PNA gas outlet in the aftertreatment system;
and the third control unit is used for closing the second heater if the exhaust temperature of the PNA gas outlet reaches a preset temperature threshold value.
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