CN108119213B - DOC temperature control method and system - Google Patents

DOC temperature control method and system Download PDF

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Publication number
CN108119213B
CN108119213B CN201711383821.8A CN201711383821A CN108119213B CN 108119213 B CN108119213 B CN 108119213B CN 201711383821 A CN201711383821 A CN 201711383821A CN 108119213 B CN108119213 B CN 108119213B
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fan
doc
rotating speed
temperature
current
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CN108119213A (en
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张成伟
高翠
于淼淼
樊京元
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Weichai Power Co Ltd
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Weichai Power Co Ltd
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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
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
    • 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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
    • 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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/105—General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
    • F01N3/106—Auxiliary oxidation catalysts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/02—Controlling of coolant flow the coolant being cooling-air
    • F01P7/04—Controlling of coolant flow the coolant being cooling-air by varying pump speed, e.g. by changing pump-drive gear ratio
    • 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

Abstract

The invention provides a DOC temperature control method, which is applied to DOC temperature control in the parking regeneration process of a motor vehicle. The method is applied to the parking regeneration process of the motor vehicle, the load of the engine is adjusted by controlling the rotating speed of the fan, namely the output power of the fan, so that the fuel quantity provided by the engine to the DOC is indirectly controlled, the rotating speed of the fan is increased when the temperature is too slow, the rotating speed of the fan is reduced when the temperature is too fast, and the aim of controlling the temperature rise speed of the DOC and ensuring the economy of the fuel is fulfilled by dynamically adjusting the rotating speed of the fan.

Description

DOC temperature control method and system
Technical Field
The invention relates to the technical field of diesel engine aftertreatment, in particular to a DOC temperature control method and a DOC temperature control system.
Background
The diesel engine has the advantages of good dynamic performance and more economical fuel, and is widely applied to various vehicles. However, with the increasing awareness of environmental protection, in recent years, increasingly strict exhaust emission regulations have been developed, and exhaust gas treatment technology becomes an essential technology for the development of diesel engines.
At present, a Diesel Particulate Filter (DPF) system is mostly adopted for exhaust gas regeneration treatment on a Diesel engine, the DPF system mainly comprises a DOC (Diesel Oxidation Catalyst) and a DPF, the DPF captures soot Particles (PM) in exhaust gas, the main component of the soot particles is carbon, the DOC is a carrier of an oxidant, and is used for promoting the captured soot particles to perform Oxidation reaction, and then the soot particles are regenerated into gases such as carbon dioxide, so that the purpose of reducing the PM content in exhaust gas emission is achieved. In the regeneration treatment process of the tail gas, the oxidation catalysis of the DOC can play a role in catalytic oxidation at the high temperature of 550-600 ℃, and after the captured soot particles are gathered to a certain amount, the DOC needs to be heated up to reach the regeneration condition of the DPF.
In the parking regeneration process of the motor vehicle, the motor vehicle is in situ and is in idling in situ, the engine supplies fuel to the DOC to heat the DOC, so that the temperature of the DOC is increased to the regeneration condition of the DPF, the whole parking regeneration period needs about half an hour to be completed, the overlong heating time can increase the whole parking regeneration period, the regeneration efficiency is low, the temperature is increased by supplying more fuel oil, the oil consumption of the whole vehicle is increased, and the fuel oil economy is reduced.
Disclosure of Invention
In view of the above, the present invention provides a DOC temperature control method, which shortens DOC temperature rise time in a motor vehicle parking regeneration process, and simultaneously ensures fuel economy.
In order to achieve the purpose, the invention has the following technical scheme:
the DOC temperature control method is applied to DOC temperature control in the parking regeneration treatment process of a motor vehicle, the motor vehicle comprises an engine, a DOC and a fan, the fan is used for cooling engine cooling liquid, the fan is the load of the engine, and the engine provides fuel for temperature rise for the DOC, the method comprises the following steps:
after the regeneration treatment is started, DOC temperature rise and fan auxiliary control are carried out, wherein the fan auxiliary control comprises the following steps: setting the rotating speed of the fan to be a preset initial rotating speed, and then, controlling the rotating speed of the fan in stages until the temperature of the DOC reaches a target temperature;
at time ti, i is greater than or equal to 2, and the control of the rotating speed of the fan comprises the following steps:
according to the DOC temperature value Ti at the current moment and the DOC temperature value T at the previous momenti-1Obtaining the current DOC temperature change rate △ Ti;
when the current DOC temperature change rate △ Ti is smaller than a first temperature change rate threshold value and the current rotating speed of the fan is smaller than a preset maximum rotating speed, increasing the rotating speed of the fan;
and when the current DOC temperature change rate △ Ti is greater than a second temperature change rate threshold value and the current rotating speed of the fan is greater than the preset initial rotating speed, reducing the rotating speed of the fan.
Optionally, after the regeneration process is started and before the fan assist control, the method further includes:
and obtaining a current water temperature value W1 of the engine, and if the current water temperature value W1 is smaller than a water temperature threshold value, executing the fan auxiliary control.
Optionally, at time ti, before the controlling of the fan rotation speed, the method further includes:
and obtaining the current water temperature value of the engine at the moment ti, and if the current water temperature value is smaller than the water temperature threshold, executing the control of the rotating speed of the fan.
Optionally, if the current water temperature value is smaller than the water temperature threshold, performing conventional control on the rotation speed of the fan.
Optionally, the increasing the rotation speed of the fan comprises: and increasing the current rotating speed of the fan by a preset value, or increasing the current rotating speed of the fan according to a preset proportion to be used as the rotating speed of the fan.
Optionally, the reducing the rotation speed of the fan comprises:
and reducing the current rotating speed of the fan by a preset value, or reducing the current rotating speed of the fan according to a preset proportion to be used as the reduced rotating speed of the fan.
The invention also provides a DOC temperature control system, which is applied to DOC temperature control in the parking regeneration treatment process of a motor vehicle, wherein the motor vehicle comprises an engine, a DOC and a fan, the fan is used for cooling the coolant of the engine, the fan is the load of the engine, the engine provides fuel for heating for the DOC, and the system comprises a DOC heating unit and a fan auxiliary control unit; wherein the content of the first and second substances,
the DOC heating unit is used for heating DOC after the regeneration treatment is started;
the fan auxiliary control unit includes:
a rotation speed setting unit for setting the rotation speed of the fan to a preset initial rotation speed after the regeneration process is started;
the rotating speed control unit is used for controlling the rotating speed of the fan in a staged manner until the temperature of the DOC reaches a target temperature;
at time ti, i is greater than or equal to 2, and the control of the rotating speed of the fan comprises the following steps:
according to the DOC temperature value Ti at the current moment and the DOC temperature value T at the previous momenti-1Obtaining the current DOC temperature change rate △ Ti;
when the current DOC temperature change rate △ Ti is smaller than a first temperature change rate threshold value and the current rotating speed of the fan is smaller than a preset maximum rotating speed, increasing the rotating speed of the fan;
and when the current DOC temperature change rate △ Ti is greater than a second temperature change rate threshold value and the current rotating speed of the fan is greater than the preset initial rotating speed, reducing the rotating speed of the fan.
Optionally, the method further comprises:
and the first water temperature judging unit is used for obtaining a current water temperature value W1 of the engine before the fan auxiliary control unit is executed, and if the current water temperature value W1 is smaller than a water temperature threshold value, turning to the fan auxiliary control unit.
Optionally, the fan auxiliary control unit further comprises: and the second water temperature judging unit is used for obtaining the current water temperature value of the engine at the moment ti, and if the current water temperature value is smaller than the water temperature threshold, the control of the rotating speed of the fan is executed.
Optionally, in the first water temperature determining unit and the second water temperature determining unit, if the current water temperature value is smaller than the water temperature threshold, performing conventional control on the rotation speed of the fan.
The DOC temperature control method and the DOC temperature control system provided by the embodiment of the invention are applied to DOC temperature control in the parking regeneration process of a motor vehicle, when the motor vehicle is parked, the engine is in an idling operation in situ, fuel for heating is provided for the DOC through the engine, the fan is a device for cooling the engine, after regeneration treatment is started, the rotating speed of the fan is controlled to be a preset rotating speed, then the rotating speed of the fan is controlled in stages, when the DOC temperature change rate is small, the rotating speed of the fan is increased, and when the DOC temperature change rate is large, the rotating speed of the fan is reduced until the temperature of the DOC reaches the target temperature. The method is applied to the parking regeneration process of the motor vehicle, the load of the engine is adjusted by controlling the rotating speed of the fan, namely the output power of the fan, so that the fuel quantity provided by the engine to the DOC is indirectly controlled, the rotating speed of the fan is increased when the temperature is too slow, the rotating speed of the fan is reduced when the temperature is too fast, and the aim of controlling the temperature rise speed of the DOC and ensuring the economy of the fuel is fulfilled by dynamically adjusting the rotating speed of the fan.
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 illustrates a flow diagram of a DOC temperature control method according to an embodiment of the invention;
fig. 2 shows a schematic structural diagram of a DOC temperature control system according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
As described in the background art, in the process of performing exhaust gas regeneration treatment in the DPF system, the DOC needs to be heated to a certain high temperature to perform catalytic reaction, so as to regenerate the particulates collected by the DPF into gas. In the parking regeneration process of the motor vehicle, the motor vehicle is in situ, the engine runs in situ at an idle speed, the engine supplies fuel to the DOC for heating, so that the temperature of the DOC is increased to the regeneration condition of the DPF, the overlong heating time can increase the whole parking regeneration period, the regeneration efficiency is low, the temperature is increased by supplying more fuel, the fuel consumption of the whole vehicle is increased, and the fuel economy is reduced. Therefore, the invention provides a DOC temperature control method, which aims to shorten DOC temperature rise time in the parking regeneration process of a motor vehicle and ensure the economy of fuel oil.
The method provided by the application is applied to DOC temperature control in the process of vehicle parking regeneration treatment, and for facilitating understanding of the technical scheme of the application, the application environment and the system of the invention are described first.
On the motor vehicle of the present application, at least an engine, a DPF system, and a fan are mounted. DPF systems, i.e., diesel particulate filter systems, are used for regeneration of exhaust gas, and generally include at least a Diesel Particulate Filter (DPF) for capturing soot particles in the exhaust gas, the main component of the soot particles being carbon, and an oxidation catalyst (DOC) which is a carrier of an oxidant for promoting oxidation reaction of the captured soot particles to oxidize the soot particles into carbon dioxide and the like. After the particulate in the exhaust gas captured by the DPF reaches a certain amount, the regeneration process is started, and after the regeneration process is started, the initial stage is the temperature raising stage of the DOC, that is, the temperature of the DOC is raised to the temperature capable of oxidation catalysis, generally to the high temperature of about 550-. Generally, the temperature of the DOC is raised by a heating device, which mainly includes an injector and an intake throttle valve, and the fuel for raising the temperature is supplied from the engine to the injector, and the temperature raising control is realized by controlling the amount of fuel intake and the opening degree of the intake throttle valve. The fan is a device for cooling the engine, that is, a cooling fan for cooling the coolant, and the fan is a necessary load when the engine is operated. When the motor vehicle is parked, the motor vehicle is in a stationary state, the engine runs at an idle speed, parking regeneration is carried out, and the load of the engine mainly comprises an electric fan and a DOC.
Based on the DOC temperature control method, the DOC temperature control method is applied to DOC temperature control in the parking regeneration process of a motor vehicle, when the motor vehicle is parked, the engine is in idle running in situ, fuel for heating is provided for the DOC through the engine, the fan is a device for cooling the engine, after regeneration treatment is started, the rotating speed of the fan is controlled to be the preset rotating speed, then the rotating speed of the fan is controlled in stages, when the DOC temperature change rate is small, the rotating speed of the fan is increased, and when the DOC temperature change rate is large, the rotating speed of the fan is reduced until the temperature of the DOC reaches the target temperature. The method is applied to the parking regeneration process of the motor vehicle, the load of the engine is adjusted by controlling the rotating speed of the fan, namely the output power of the fan, so that the fuel quantity provided by the engine to the DOC is indirectly controlled, the rotating speed of the fan is increased when the temperature is too slow, the rotating speed of the fan is reduced when the temperature is too fast, and the aim of controlling the temperature rise speed of the DOC and ensuring the economy of the fuel is fulfilled by dynamically adjusting the rotating speed of the fan.
In order to better understand the technical solutions and effects of the present invention, the following detailed descriptions will be given with reference to specific examples.
Referring to fig. 1, after the regeneration process is started in step S101, DOC temperature rise is performed, and a current water temperature value W1 of the engine is obtained, if the current water temperature value W1 is smaller than a water temperature threshold value, step S102 is performed, otherwise, normal control of the fan speed is performed.
In an embodiment of the invention, the motor vehicle comprises at least an engine, a DOC and a fan, wherein the fan is used for cooling engine coolant and is also used as a load of the engine, and the engine provides fuel for heating the DOC. According to different designs and requirements, the temperature rising device can have different structures and temperature rising control methods, but the fuel used by the temperature rising device during the temperature rising of the DOC is provided by the engine, namely the fuel quantity is controlled by the engine.
The fan is a cooling device of the engine, and the normal control of the fan means that the rotation speed of the fan is controlled according to the temperature of the coolant when the engine is running. At the time of the parking regeneration process, the load amount of the engine is relatively small, and at this time, the fan has a small rotation speed under the normal control.
The regeneration process is usually initiated after a certain amount of particulates captured by the DPF reaches, and may be initiated actively or automatically, after which the DOC temperature rise control is started, that is, the heating device starts to operate, so that the DOC temperature rises, and the fuel amount in the DOC specific temperature control is determined by the fuel injection amount provided by the engine. At this time, firstly, obtaining a current water temperature value W1 of the engine, that is, the temperature of the engine coolant, and firstly, determining whether the temperature W1 of the coolant is smaller than a water temperature threshold, where the water temperature threshold may be set according to a specific engine condition, in one example, the water temperature threshold is 90 ℃, and if the current water temperature value W1 is smaller than the threshold, the engine temperature is normal, and performing subsequent fan auxiliary control; if the current water temperature value W1 is larger than the threshold value and the engine temperature is at the early warning value, the conventional control of the fan is carried out, and the rotating speed of the fan is not additionally controlled.
In step S102, the rotation speed of the fan is set to a preset initial rotation speed N1.
The preset initial rotation speed N1 is an initial rotation speed of the fan assist control, and the preset initial rotation speed N1 may be determined based on an experimental or empirical value, and the preset initial rotation speed N1 may ensure at least cooling performance of the engine and may have a rotation speed value larger than a rotation speed of the fan conventionally controlled at the time of the normal idle operation.
In step S103, the fan rotation speed is controlled in stages until the temperature of the DOC reaches the target temperature.
Specifically, at time ti, i is a natural number, i is greater than or equal to 2, and the control of the rotating speed of the fan comprises the following steps: according to the DOC temperature value Ti at the current moment and the DOC temperature value T at the previous momenti-1The method comprises the steps of obtaining a current DOC temperature change rate △ Ti, increasing the rotating speed of a fan when the current DOC temperature change rate △ Ti is smaller than a first temperature change rate threshold value and the current rotating speed of the fan is smaller than a preset maximum rotating speed, and decreasing the rotating speed of the fan when the current DOC temperature change rate △ Ti is larger than a second temperature change rate threshold value and the current rotating speed of the fan is larger than the preset initial rotating speed.
The fan speed may be controlled in fixed periodic steps, i.e. ti-ti-1The time interval of (a) is constant, but it can of course also be carried out according to other desired time periods, i.e. ti and ti-1The time of day is any desired point in time.
In different time periods, the rotating speed of the fan is adjusted according to the DOC temperature change rate, at the moment, the fan does not operate according to the conventionally controlled rotating speed, but the auxiliary control of the fan is carried out, so that the fan is regulated and controlled in real time according to the DOC temperature change rate, and when the DOC temperature rises too fast, the rotating speed of the fan is slowed down, so that the load capacity of the engine is reduced, the fuel quantity provided for the DOC is reduced, and the fuel consumption is saved; and when the temperature of the DOC is increased too slowly, the rotating speed of the fan is increased, the load of the engine is increased, the fuel quantity supplied to the DOC is increased, and the temperature rising speed is increased. Therefore, in the DOC temperature rise process, the load of the engine is dynamically changed through the regulation and control of the fan, so that the DOC temperature rise speed is dynamically adjusted, the DOC temperature rise time in the parking regeneration process of the motor vehicle is shortened, and the fuel economy is ensured.
In the following description with reference to the specific embodiment, in step S1031, DOC temperature value T1 at time T1 is obtained.
Starting from time point i being 2, that is, time point t2, in step S1032, obtaining DOC temperature value Ti at time point Ti, and stopping control of the fan rotation speed if DOC temperature value Ti at time point Ti reaches a target temperature value; if the DOC temperature value does not reach the target temperature value, the following steps are executed until the DOC temperature value reaches the target temperature value.
The DOC temperature value may be obtained by a temperature sensor. The range of the target temperature value is, for example, 550-.
In step S1033, DOC temperature values Ti and t at time Ti are determinedi-1DOC temperature value T of momenti-1The current DOC temperature change rate △ Ti is obtained.
Specifically, the expression for the current DOC temperature change rate △ Ti may be:
△Ti＝(Ti-Ti-1)/(ti-ti-1)。
in step S1034, if the current DOC temperature change rate △ Ti is less than the first temperature change rate threshold C1, and when the current rotation speed of the fan is less than the preset maximum rotation speed, the rotation speed of the fan is increased.
The first temperature change rate threshold C1 may be set according to an empirical value, and when the DOC temperature change rate △ Ti is smaller than the first temperature change rate threshold C1, it is determined that the DOC temperature changes too slowly, at this time, if the fan speed does not reach the preset maximum speed, the fan speed is continuously increased, at this time, the preset maximum speed may be a limit speed of the fan, or may be another set value.
When the rotation speed of the fan is increased, there may be multiple implementations, and in some embodiments, for example, the current rotation speed of the fan may be increased by a preset value, and the increased rotation speed is used as the rotation speed of the fan, where the preset value may be a fixed rotation speed value C2, that is, at different time ti, the rotation speed value that is increased each time is a fixed value. The preset value may also be a fixed value that changes with time, for example, as the temperature rise continues, the value i increases continuously, and at different times ti, the increased preset value Ci may decrease continuously. Like this, along with the continuous increase of DOC temperature, can be with the continuous reduction of the increment of rotational speed, when improving the intensification efficiency, guarantee the economic nature of fuel.
In other examples, the fan may be increased by a preset ratio, which may be a fixed ratio P2, i.e., the current speed value is increased by a fixed ratio P2 each time at different time ti. The preset proportion may also be a proportion value that changes with time, for example, as the temperature rise continues, the value i increases continuously, and at different ti moments, the increased preset proportion Pi may decrease continuously. Like this, along with the continuous increase of DOC temperature, can be with the continuous reduction of the increment of rotational speed, when improving the intensification efficiency, guarantee the economic nature of fuel.
In step S1035, if the current DOC temperature change rate △ Ti is greater than the second temperature change rate threshold C2, and when the current rotation speed of the fan is greater than the preset initial rotation speed, the rotation speed of the fan is decreased.
The second temperature change rate threshold C2 may be set according to empirical values, and when the DOC temperature change rate △ Ti is greater than the second temperature change rate threshold C2, the DOC temperature is considered to be changing too fast, and at this time, if the fan speed is not less than the preset initial speed N1, the fan speed is continuously reduced.
When the rotation speed of the fan is reduced, there may be a plurality of implementation manners, and in some embodiments, for example, the current rotation speed of the fan may be reduced by a preset value, as the rotation speed of the fan, where the preset value may be a fixed rotation speed value D2, that is, at different time ti, the rotation speed value reduced each time is a fixed value; the preset value can also be a fixed value which changes along with time, for example, as the temperature rise continues, the value i increases continuously, and at different moments ti, the reduced preset value Di can increase continuously, so that the reduction of the rotating speed increases continuously. Like this, along with the continuous increase of DOC temperature, can be with the continuous increase of the decrement of rotational speed, when guaranteeing the intensification efficiency, improve the economic nature of fuel.
In other examples, the fan may be reduced by a preset ratio, which may be a fixed ratio Q2, i.e., the current speed value is reduced by a fixed ratio Q2 each time at different time ti. The preset ratio may also be a ratio value that changes with time, for example, as the temperature rise continues, the value i increases continuously, and at different ti times, the reduced preset ratio Qi may increase continuously. Like this, along with the continuous increase of DOC temperature, can be with the continuous increase of the decrement of rotational speed, when guaranteeing the intensification efficiency, improve the economic nature of fuel.
i is added with one, and the steps S1032 to S1035 are repeated until the temperature rise process of the DOC is completed.
Further, before the step S103 is executed, the method may further include: and obtaining the current water temperature value of the engine at the moment ti, and if the current water temperature value is smaller than the water temperature threshold, executing the control of the rotating speed of the fan. Synchronizing the description in the step S101, wherein the current water temperature value is the temperature Wi of the engine coolant, and if the current water temperature Wi is smaller than the threshold value, the engine temperature is normal, and subsequent fan auxiliary control may be performed; if the current water temperature value Wi is larger than the threshold value, the temperature of the engine is in an early warning value, the fan is controlled normally, and the rotating speed of the fan is not controlled additionally. Therefore, the state of the engine is safe in the whole DOC temperature control process by monitoring the water temperature value.
In the DOC temperature control method according to the embodiment of the present invention, the load of the engine is adjusted by controlling the rotation speed of the fan, that is, the output power of the fan, so as to indirectly control the amount of fuel oil supplied to the DOC by the engine, when the temperature is too slow, the rotation speed of the fan is increased, and when the temperature is too fast, the rotation speed of the fan is decreased, and the rotation speed of the fan is dynamically adjusted, so that the purpose of controlling the temperature increase speed of the DOC and ensuring the economy of the fuel oil is achieved.
In addition, the invention also provides a DOC temperature control system for realizing the method, which is applied to DOC temperature control in a parking regeneration treatment process of a motor vehicle, wherein the motor vehicle comprises an engine 10, a DOC20 and a fan 30, the fan 30 is used for cooling the engine coolant, the fan 30 is a load of the engine 10, and the engine 10 provides fuel for heating to the DOC20, and the DOC temperature control system comprises a DOC heating unit 200 and a fan auxiliary control unit 210, as shown in fig. 2; wherein the content of the first and second substances,
the DOC heating unit 200 is configured to perform DOC heating after the regeneration process is started;
the fan assist control unit 210 includes:
a rotation speed setting unit for setting the rotation speed of the fan to a preset initial rotation speed after the regeneration process is started;
the rotating speed control unit is used for controlling the rotating speed of the fan in a staged manner until the temperature of the DOC reaches a target temperature;
at time ti, i is greater than or equal to 2, and the control of the rotating speed of the fan comprises the following steps:
according to the DOC temperature value Ti at the current moment and the DOC temperature value T at the previous momenti-1Obtaining the current DOC temperature change rate △ Ti;
when the current DOC temperature change rate △ Ti is smaller than a first temperature change rate threshold value and the current rotating speed of the fan is smaller than a preset maximum rotating speed, increasing the rotating speed of the fan;
and when the current DOC temperature change rate △ Ti is greater than a second temperature change rate threshold value and the current rotating speed of the fan is greater than the preset initial rotating speed, reducing the rotating speed of the fan.
Further, still include:
and the first water temperature judging unit is used for obtaining a current water temperature value W1 of the engine before the fan auxiliary control unit is executed, and if the current water temperature value W1 is smaller than a water temperature threshold value, turning to the fan auxiliary control unit.
Further, the fan assist control unit further includes: and the second water temperature judging unit is used for obtaining the current water temperature value of the engine at the moment ti, and if the current water temperature value is smaller than the water temperature threshold, the control of the rotating speed of the fan is executed.
Further, in the first water temperature determination unit and the second water temperature determination unit, if the current water temperature value is smaller than the water temperature threshold value, the fan rotation speed is conventionally controlled.
The foregoing is only a preferred embodiment of the present invention, and although the present invention has been disclosed in the preferred embodiments, it is not intended to limit the present invention. Those skilled in the art can make numerous possible variations and modifications to the present teachings, or modify equivalent embodiments to equivalent variations, without departing from the scope of the present teachings, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.

Claims (10)

1. The DOC temperature control method is applied to DOC temperature control in the parking regeneration treatment process of a motor vehicle, the motor vehicle comprises an engine, a DOC and a fan, the fan is used for cooling engine cooling liquid, the fan is used for loading the engine, the engine provides fuel for temperature rise for the DOC, and the DOC temperature control method is characterized by comprising the following steps of:
after the regeneration treatment is started, DOC temperature rise and fan auxiliary control are carried out, wherein the fan auxiliary control comprises the following steps: setting the rotating speed of the fan as a preset initial rotating speed, wherein the preset initial rotating speed is greater than the rotating speed conventionally controlled by the fan during idle running, the conventional control of the fan is to control the rotating speed of the fan according to the temperature of cooling liquid, and then, the rotating speed of the fan is controlled in stages until the temperature of the DOC reaches a target temperature;
at time ti, i is greater than or equal to 2, and the control of the rotating speed of the fan comprises the following steps:
according to the DOC temperature value Ti at the current moment and the DOC temperature value T at the previous momenti-1Obtaining the current DOC temperature change rate △ Ti;
when the current DOC temperature change rate △ Ti is smaller than a first temperature change rate threshold value and the current rotating speed of the fan is smaller than a preset maximum rotating speed, increasing the rotating speed of the fan;
and when the current DOC temperature change rate △ Ti is greater than a second temperature change rate threshold value and the current rotating speed of the fan is greater than the preset initial rotating speed, reducing the rotating speed of the fan.
2. The method of claim 1, wherein after initiating the regeneration process and before the fan assist control, further comprising:
and obtaining a current water temperature value W1 of the engine, and if the current water temperature value W1 is smaller than a water temperature threshold value, executing the fan auxiliary control.
3. The method of claim 2, wherein prior to controlling the fan speed at time ti, further comprising:
and obtaining the current water temperature value of the engine at the moment ti, and if the current water temperature value is smaller than the water temperature threshold, executing the control of the rotating speed of the fan.
4. A method according to claim 3, wherein the normal control of the fan speed is performed if the current water temperature value is greater than the water temperature threshold value.
5. The method of claim 1, wherein the increasing the rotational speed of the fan comprises: and increasing the current rotating speed of the fan by a preset value, or increasing the current rotating speed of the fan according to a preset proportion to be used as the rotating speed of the fan.
6. The method of claim 1, wherein the reducing the rotational speed of the fan comprises:
and reducing the current rotating speed of the fan by a preset value, or reducing the current rotating speed of the fan according to a preset proportion to be used as the reduced rotating speed of the fan.
7. A DOC temperature control system is applied to DOC temperature control in the parking regeneration treatment process of a motor vehicle, the motor vehicle comprises an engine, a DOC and a fan, the fan is used for cooling engine cooling liquid, the fan is a load of the engine, and the engine provides fuel for temperature rise for the DOC; wherein the content of the first and second substances,
the DOC heating unit is used for heating DOC after the regeneration treatment is started;
the fan auxiliary control unit includes:
a rotation speed setting unit configured to set a rotation speed of the fan to a preset initial rotation speed after starting the regeneration process, the preset initial rotation speed being greater than a rotation speed of a conventional fan control during idle operation, the conventional fan control being to control the rotation speed of the fan according to a temperature of the coolant;
the rotating speed control unit is used for controlling the rotating speed of the fan in a staged manner until the temperature of the DOC reaches a target temperature;
at time ti, i is greater than or equal to 2, and the control of the rotating speed of the fan comprises the following steps:
according to the DOC temperature value Ti at the current moment and the DOC temperature value T at the previous momenti-1Obtaining the current DOC temperature change rate △ Ti;
when the current DOC temperature change rate △ Ti is smaller than a first temperature change rate threshold value and the current rotating speed of the fan is smaller than a preset maximum rotating speed, increasing the rotating speed of the fan;
and when the current DOC temperature change rate △ Ti is greater than a second temperature change rate threshold value and the current rotating speed of the fan is greater than the preset initial rotating speed, reducing the rotating speed of the fan.
8. The system of claim 7, further comprising:
and the first water temperature judging unit is used for obtaining a current water temperature value W1 of the engine before the fan auxiliary control unit is executed, and if the current water temperature value W1 is smaller than a water temperature threshold value, turning to the fan auxiliary control unit.
9. The system of claim 8, wherein the fan assist control unit further comprises: and the second water temperature judging unit is used for obtaining the current water temperature value of the engine at the moment ti, and if the current water temperature value is smaller than the water temperature threshold, the control of the rotating speed of the fan is executed.
10. The system of claim 9, wherein the first water temperature determining unit and the second water temperature determining unit perform regular control of the rotation speed of the fan if the current water temperature value is greater than the water temperature threshold value.
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