CN111120120B - EGR system control method and device and ECU - Google Patents

EGR system control method and device and ECU Download PDF

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Publication number
CN111120120B
CN111120120B CN202010242523.2A CN202010242523A CN111120120B CN 111120120 B CN111120120 B CN 111120120B CN 202010242523 A CN202010242523 A CN 202010242523A CN 111120120 B CN111120120 B CN 111120120B
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egr
temperature
egr system
deicing
preset
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CN111120120A (en
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曹石
黄玉平
秦涛
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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
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D21/00—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas
    • F02D21/06—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air
    • F02D21/08—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/35—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with means for cleaning or treating the recirculated gases, e.g. catalysts, condensate traps, particle filters or heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/49—Detecting, diagnosing or indicating an abnormal function of the EGR system

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Abstract

The invention provides an EGR system control method, an EGR system control device and an ECU (electronic control unit), wherein the method comprises the following steps: when the deicing switch is set and the enabling state in the ECU is set to be a set state, the EGR system is forbidden to operate, and the output torque of the engine is limited to be within a preset range; when the upstream temperature of the EGR is greater than or equal to a first preset temperature threshold value, controlling a cooling liquid throttling electromagnetic valve to be fully opened, and starting a deicing timer; judging whether the deicing timing time is greater than or equal to a first time threshold or judging whether the running time of the engine is greater than or equal to a second time threshold; and if so, determining that the deicing of the control device of the EGR system is finished, and normally starting the EGR system. In this scheme, through gathering EGR upper reaches temperature control coolant liquid throttle solenoid valve's the proportion of opening, confirm to flow into EGR intercooler coolant liquid flow, make EGR upper reaches temperature rise and then melt the ice that the EGR system is interior to be concreted, get rid of the ice that the EGR system is interior to be concreted under the condition that does not need the manual work to demolish.

Description

EGR system control method and device and ECU
Technical Field
The invention relates to the technical field of mechanical industry, in particular to an EGR system control method, an EGR system control device and an ECU (electronic control unit).
Background
The fuel adopted by the engine is Compressed Natural Gas (CNG) and liquid Natural Gas (L acquired Natural Gas, L NG), the main component of the fuel is methane, and a large amount of moisture is generated after combustion, so that certain moisture usually exists in a cylinder, an exhaust pipe and an EGR system of the engine.
At present, ice blocks in an EGR system are removed mainly through a manual removing mode by using hot water or a knocking mode, and the EGR system is installed after ice is removed. Therefore, it is an urgent need to solve the problem of the present invention to provide a method and a device for controlling an EGR system, which can directly remove ice in the EGR system.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method and an apparatus for controlling an EGR system, so as to solve the problem in the prior art that manual removal of the EGR system for deicing wastes time and labor.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
the invention discloses a control method of an EGR system, which is suitable for an EGR system control device, wherein the EGR system control device comprises a deicing switch, an ECU, a coolant throttling electromagnetic valve and an EGR system, the deicing switch is connected with the ECU, the coolant throttling electromagnetic valve is arranged in a water inlet pipeline of the EGR system and is used for controlling the flow of coolant water flowing into an EGR intercooler, and the method comprises the following steps:
acquiring conventional parameters of an EGR system in real time, wherein the conventional parameters comprise EGR upstream temperature, engine running time, engine rotating speed, environment temperature, exhaust temperature and engine coolant temperature;
when the fact that the deicing switch is set and an enabling state in an ECU is set to be a set state is detected, the EGR system is forbidden to operate, the output torque of an engine is limited to be within a preset range, wherein the prohibition of the operation of the EGR system is used for indicating that an EGR rate and an EGR driving duty ratio in the EGR system are cleared, and the detection instruction of EGR related faults is forbidden to start;
when the upstream temperature of the EGR is greater than or equal to a first preset temperature threshold value, controlling the cooling liquid throttling electromagnetic valve to be fully opened, and starting a deicing timer;
judging whether the deicing timing time is greater than or equal to a first time threshold value or judging whether the running time of the engine is greater than or equal to a second time threshold value;
and if the temperature is larger than or equal to the preset temperature, determining that the deicing of the EGR system control device is finished, and normally starting the EGR system.
Optionally, the method further includes:
when the EGR upstream temperature is lower than a first preset temperature threshold value, determining the opening ratio of the cooling liquid throttling electromagnetic valve according to the preset EGR upstream temperature and the EGR upstream temperature;
and controlling the flow of the cooling liquid flowing into the EGR intercooler according to the opening proportion of the cooling liquid throttling electromagnetic valve so as to start deicing timing when the exhaust temperature of the EGR system reaches a first preset temperature threshold value.
Optionally, the determining the opening ratio of the coolant throttle solenoid valve according to the preset EGR upstream temperature and the EGR upstream temperature includes:
calculating a difference value between the preset EGR upstream temperature and the EGR upstream temperature;
outputting a driving duty ratio corresponding to the difference value of the preset EGR upstream temperature and the EGR upstream temperature according to PID closed-loop control;
and determining the opening ratio of the cooling liquid throttling electromagnetic valve according to the driving duty ratio.
Optionally, the method further includes:
and if the deicing timing time is less than a first time threshold, or the engine running time is less than a second time threshold, executing a step of judging whether the EGR upstream temperature is greater than or equal to a first preset temperature threshold.
Optionally, when the deicing switch is set, setting the enable state in the ECU to be the set state includes:
judging whether the environment temperature is less than or equal to a second preset temperature threshold value or not;
if the ambient temperature is less than or equal to a second preset temperature threshold value, setting an enabling state in the ECU to be a setting state;
and/or judging whether the temperature of the cooling liquid is less than or equal to a third preset temperature threshold value or not;
and if the temperature of the cooling liquid is less than or equal to a third preset temperature threshold value, setting the enabling state in the ECU to be a setting state.
The invention discloses a second aspect of the EGR system control device, the EGR system control device includes a deicing switch, an ECU, a coolant throttle electromagnetic valve and an EGR system;
the deicing switch is connected with the ECU, and the ECU is connected with the EGR system;
the cooling liquid throttling electromagnetic valve is arranged in a water inlet pipeline of the EGR system and used for controlling the flow of cooling liquid water flowing into an EGR intercooler;
the ECU is configured to: acquiring conventional parameters of an EGR system in real time, wherein the conventional parameters comprise EGR upstream temperature, engine running time, engine rotating speed, environment temperature, exhaust temperature and engine coolant temperature; when the fact that the deicing switch is set and an enabling state in an ECU is set to be a set state is detected, the EGR system is forbidden to operate, the output torque of an engine is limited to be within a preset range, wherein the prohibition of the operation of the EGR system is used for indicating that an EGR rate and an EGR driving duty ratio in the EGR system are cleared, and the detection instruction of EGR related faults is forbidden to start; when the upstream temperature of the EGR is greater than or equal to a first preset temperature threshold value, controlling the cooling liquid throttling electromagnetic valve to be fully opened, and starting a deicing timer; judging whether the deicing timing time is greater than or equal to a first time threshold value or judging whether the running time of the engine is greater than or equal to a second time threshold value; and if the temperature is larger than or equal to the preset temperature, determining that the deicing of the EGR system control device is finished, and normally starting the EGR system.
Optionally, the ECU is further configured to: when the EGR upstream temperature is lower than a first preset temperature threshold value, determining the opening ratio of the cooling liquid throttling electromagnetic valve according to the preset EGR upstream temperature and the EGR upstream temperature; and controlling the flow of the cooling liquid flowing into the EGR intercooler according to the opening proportion of the cooling liquid throttling electromagnetic valve so as to start deicing timing when the exhaust temperature of the EGR system reaches a first preset temperature threshold value.
Optionally, the ECU that determines the opening ratio of the coolant throttle solenoid valve according to a preset EGR upstream temperature and the EGR upstream temperature is specifically configured to: calculating a difference value between the preset EGR upstream temperature and the EGR upstream temperature; outputting a driving duty ratio corresponding to the difference value of the preset EGR upstream temperature and the EGR upstream temperature according to PID closed-loop control; and determining the opening ratio of the cooling liquid throttling electromagnetic valve according to the driving duty ratio.
Optionally, when the deicing switch is set, the ECU in the ECU whose enable state is the set state is set, and specifically configured to: judging whether the environment temperature is less than or equal to a second preset temperature threshold value or not; if the ambient temperature is less than or equal to a second preset temperature threshold value, setting an enabling state in the ECU to be a setting state; and/or judging whether the temperature of the cooling liquid is less than or equal to a third preset temperature threshold value or not; and if the temperature of the cooling liquid is not more than a third preset temperature threshold value, setting the enabling state in the ECU to be a setting state.
A third aspect of the invention discloses an electronic control unit ECU, the ECU including: the EGR system control method comprises a processor and a memory, wherein a computer program is stored in the memory, and the processor executes the computer program to realize the EGR system control method disclosed by the first aspect of the invention.
Based on the EGR system control method, the EGR system control device and the ECU, the method comprises the following steps: acquiring conventional parameters of an EGR system in real time, wherein the conventional parameters comprise EGR upstream temperature, engine running time, engine speed, environment temperature, exhaust temperature and engine coolant temperature; when the deicing switch is set and the enabling state in the ECU is set to be a set state, forbidding the EGR system to operate, and limiting the output torque of the engine to be in a preset range, wherein the forbidding the EGR system to operate is used for indicating to clear the EGR rate and the EGR driving duty ratio in the EGR system and forbidding the detection instruction of the EGR related fault to start; when the upstream temperature of the EGR is greater than or equal to a first preset temperature threshold value, controlling a cooling liquid throttling electromagnetic valve to be fully opened, and starting a deicing timer; judging whether the deicing timing time is greater than or equal to a first time threshold value or judging whether the running time of the engine is greater than or equal to a second time threshold value; and if the temperature is larger than or equal to the preset temperature, determining that the deicing of the EGR system control device is finished, and normally starting the EGR system. In the embodiment of the invention, manual disassembly is not needed, the opening proportion of the cooling liquid throttling electromagnetic valve is controlled by the EGR upstream temperature collected by the temperature sensor, so that the flow of the cooling liquid flowing into the EGR intercooler is determined, the temperature of the EGR upstream is increased to further melt ice accumulated in the EGR system, the ice accumulated in the EGR system is removed under the condition of no manual disassembly, the false alarm fault of the EGR system is further avoided, and the purpose of preventing the engine from being damaged is achieved.
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 described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a block diagram of an EGR system control apparatus according to an embodiment of the present invention;
fig. 2 is a block diagram of an ECU according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart illustrating a method for controlling an EGR system according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart illustrating another EGR system control method provided by an embodiment of the present invention;
fig. 5 is a flowchart illustrating another EGR system control method according to an embodiment of the present invention.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.
In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In the embodiment of the invention, manual disassembly is not needed, the opening proportion of the cooling liquid throttling electromagnetic valve is controlled by the EGR upstream temperature collected by the temperature sensor, so that the flow of the cooling liquid flowing into the EGR intercooler is determined, the temperature of the EGR upstream is increased to further melt ice accumulated in the EGR system, the ice accumulated in the EGR system is removed under the condition of no manual disassembly, the false alarm fault of the EGR system is further avoided, and the purpose of preventing the engine from being damaged is achieved.
Referring to fig. 1, a block diagram of an EGR system control apparatus according to an embodiment of the present invention is shown, where the EGR system control apparatus includes: a de-icing switch 100, an Electronic Control Unit (ECU) 200, a coolant throttle solenoid valve 300, and an EGR system 400.
The EGR system 400 comprises a venturi 401, an EGR valve 402, an EGR intercooler 403 and a temperature sensor 404, in particular the EGR intercooler 403 is connected with the EGR valve 402, the venturi 401 is connected with the EGR valve 402, and the temperature sensor 404 is arranged in the conduit between the EGR intercooler 403 and the EGR valve 402, i.e. upstream of the EGR.
Deicing switch 100 is connected to ECU200, and ECU200 is connected to EGR system 400.
A coolant throttle solenoid valve 300 is disposed in the water inlet conduit of the EGR system 400.
In particular implementations, temperature sensor 404 is used to collect EGR upstream temperature of EGR system 400.
The coolant throttle solenoid valve 300 is used to control the flow of coolant water into the EGR intercooler 403.
The first relation table CURVE is a one-dimensional array table for storing a correspondence relationship between a limit value of an output torque of the engine as an output and an engine rotational speed as an input.
In the embodiment of the present invention, the correspondence between the limit value of the output torque of the engine and the engine speed is calibrated and written in the memory inside the ECU200, and the calibrated limit value of the output torque of the engine and the engine speed are stored in the form of the first relation table CURVE.
The second relation table CURVE is a one-dimensional array table for storing a correspondence between the ambient temperature as an input and the first time threshold as an output.
In the embodiment of the present invention, the correspondence between the ambient temperature and the first time threshold is calibrated and written to the memory inside the ECU200, and the calibrated ambient temperature and the second time threshold are stored in the form of the second relationship table CURVE.
The third relation table CURVE is a one-dimensional array table for storing a correspondence between the ambient temperature as an input and the second time threshold as an output.
In the embodiment of the present invention, the correspondence between the ambient temperature and the second time threshold value is calibrated and written in the memory inside the ECU200, and the calibrated ambient temperature and the second time threshold value are stored in the form of the third relationship table CURVE.
The ECU200 is configured to: acquiring conventional parameters of the EGR system 400 in real time, prohibiting the EGR system 400 from running and limiting the output torque of the engine to be in a preset range when detecting that the deicing switch 100 is set and the enabling state in the ECU200 is set to be a set state, controlling the coolant throttle solenoid valve 300 to be fully opened and starting deicing timing when the upstream temperature of the EGR is greater than or equal to a first preset temperature threshold value; judging whether the deicing timing time is greater than or equal to a first time threshold value or judging whether the running time of the engine is greater than or equal to a second time threshold value; and if the temperature is larger than or equal to the preset temperature, determining that the deicing of the EGR system control device is finished, and starting the EGR system 400 normally.
It should be noted that the conventional parameters include EGR upstream temperature, engine run time, engine speed, ambient temperature, exhaust temperature, and engine coolant temperature; the EGR system operation is prohibited for instructing to clear the EGR rate and the EGR driving duty in the EGR system 400, and the detection instruction of the EGR-related malfunction is prohibited from being started.
In a specific implementation, the ECU200 acquires the EGR upstream temperature collected by the temperature sensor 404 in real time, acquires the ambient temperature, the exhaust temperature, and the engine coolant temperature of the engine collected by other sensors in real time, and acquires the engine running time and the engine speed in real time; when it is detected that the deicing switch 100 is pressed, it is described that the deicing switch 100 is set, and it is detected that the ECU200 sets the enable state in the ECU200 to the set state, in order to prevent the problem that the EGR system fails and the engine is damaged due to the start of the EGR system 400, the ECU200 needs to clear the EGR rate and the EGR driving duty in the EGR system 400, prohibit the start of the detection instruction of the EGR-related failure, and limit the output torque of the engine to be within a preset range, that is, disallow the start of the EGR system 400.
When the ECU200 detects that the current engine is in a low-temperature condition, the engine is started, and at this time, the engine exhaust gas is rapidly cooled after passing through the EGR intercooler 403, so when the ECU200 detects that the EGR upstream temperature collected by the temperature sensor 404 is greater than or equal to a first preset temperature threshold, the coolant throttle solenoid valve 300 is controlled to be fully opened, that is, the opening ratio of the coolant throttle solenoid valve 300 is controlled to be 100%, at this time, the coolant in the coolant water tank flows into the EGR intercooler 403 through the coolant throttle solenoid valve 300, so that the engine exhaust gas passing through the EGR intercooler 403 is heated, and the EGR upstream temperature is further raised, so as to melt the ice of the EGR system, and the deicing timing is started.
The ECU200 acquires the first time threshold from the second relation table CURVE according to the ambient temperature; acquiring a second time threshold from a third relation table CURVE according to the ambient temperature; judging whether the deicing timing time is greater than or equal to a first time threshold value or judging whether the running time of the engine is greater than or equal to a second time threshold value; if the temperature is larger than or equal to the first preset temperature threshold value, the control device of the EGR system is determined to be deiced, the EGR system 400 is started normally, and if the temperature is smaller than or equal to the second preset temperature threshold value, the ECU200 continues to detect whether the EGR upstream temperature collected by the temperature sensor 404 is larger than or equal to the first preset temperature threshold value.
The preset range refers to the maximum torque that the EGR system 400 is allowed to output without turning on the EGR system 400.
The EGR rate refers to the ratio of the amount of exhaust gas recirculated to the total amount of intake air drawn into the engine cylinder.
The EGR drive duty ratio is a ratio of time of the electric signal output to the entire signal period, and can drive the EGR system 400.
EGR related faults include EGR sticking, flow deviation and the like.
The engine is in the low temperature condition for indicating that the ambient temperature of the engine and the coolant temperature satisfy a certain temperature condition, wherein the certain temperature condition is set according to the ambient temperature.
Optionally, when it is not detected that the deicing switch 100 is set, for example: when it is not detected that the deicing switch 100 is pressed, the enable state in the ECU200 is set to the unset state, at which time the EGR system can be started normally.
Optionally, the coolant in the coolant tank flows into the EGR intercooler 403 through the coolant throttle solenoid valve 300, so that the engine exhaust passing through the EGR intercooler 403 is heated and then flows back to the coolant tank from the water outlet of the EGR intercooler 403.
In the embodiment of the invention, manual disassembly is not needed, the opening ratio of the cooling liquid throttling electromagnetic valve is controlled by the EGR upstream temperature collected by the temperature sensor, so that the flow of the cooling liquid flowing into an EGR intercooler is determined, the temperature of the EGR upstream is increased, ice of an EGR system is melted, the deicing timing is started, whether the EGR system control device finishes deicing or not is determined by the deicing timing time and the engine running time, when the deicing timing time is greater than or equal to a first time threshold value or the engine running time is greater than or equal to a second time threshold value, the EGR system control device finishes deicing, and the EGR system is normally started. The ice accumulated in the EGR system is removed under the condition of not needing manual removal, the false alarm fault of the EGR system is further avoided, and the purpose of preventing the engine from being damaged is achieved.
Based on the EGR system control apparatus shown in the above embodiment of the present invention, the ECU200 is further configured to: when the EGR upstream temperature is lower than a first preset temperature threshold value, determining the opening proportion of the cooling liquid throttle electromagnetic valve 300 according to the preset EGR upstream temperature and the EGR upstream temperature; according to the opening proportion of the coolant throttle solenoid valve 300, the flow of the coolant water flowing into the EGR intercooler 403 is controlled, so that when the exhaust temperature of the EGR system 400 reaches a first preset temperature threshold value, the deicing timing is started.
In the specific implementation process, according to the opening proportion of the coolant throttle solenoid valve 300, the coolant in the coolant water tank flows into the EGR intercooler 403 through the coolant throttle solenoid valve 300 to control the flow rate of the coolant water flowing into the EGR intercooler 403 from the coolant water tank, so that the engine exhaust gas passing through the EGR intercooler 403 is heated, that is, the exhaust temperature of the EGR system 400 is raised, when the exhaust temperature of the EGR system 400 reaches a first preset temperature threshold, the temperature of the upstream of the EGR is raised to further melt ice accumulated in the EGR system, and a deicing timer is started; the ECU200 acquires the first time threshold from the second relation table CURVE according to the ambient temperature; acquiring a second time threshold from a third relation table CURVE according to the ambient temperature; judging whether the deicing timing time is greater than or equal to a first time threshold value or judging whether the running time of the engine is greater than or equal to a second time threshold value; if the temperature is larger than or equal to the first preset temperature threshold value, the control device of the EGR system is determined to be deiced, the EGR system 400 is started normally, and if the temperature is smaller than or equal to the second preset temperature threshold value, the ECU200 continues to detect whether the EGR upstream temperature collected by the temperature sensor 404 is larger than or equal to the first preset temperature threshold value.
Optionally, the ECU200 determining the opening ratio of the coolant throttle solenoid valve 300 according to a preset EGR upstream temperature and an EGR upstream temperature is specifically configured to: calculating a difference value between a preset EGR upstream temperature and an EGR upstream temperature; outputting a driving duty ratio corresponding to a difference value between the preset EGR upstream temperature and the EGR upstream temperature according to PID closed-loop control (proportional-integral-derivative controller); the opening ratio of the coolant throttle solenoid valve 300 is determined according to the driving duty ratio.
In a specific implementation, the ECU200 calculates an EGR upstream temperature written in a memory inside the ECU200 in advance and an EGR upstream temperature collected by the temperature sensor 404 to obtain a difference value between a preset EGR upstream temperature and the EGR upstream temperature; carrying out proportional, integral or differential operation on a signal corresponding to the difference value between the preset EGR upstream temperature and the EGR upstream temperature to obtain a driving duty ratio for driving the opening degree of the cooling liquid throttling electromagnetic valve 300; the opening ratio of the coolant throttle solenoid valve 300 is determined according to the driving duty ratio.
It should be noted that there may be a linear relationship between the driving duty ratio and the opening degree of the coolant throttle solenoid valve 300, such as: the PID closing control outputs a 20% driving duty ratio, and the determined opening proportion of the cooling liquid throttling electromagnetic valve 300 is equal to 20%; there may not be a corresponding linear relationship between the driving duty ratio and the opening degree of the coolant throttle solenoid valve 300, such as: the PID closing control outputs a 20% driving duty ratio, and the determined opening proportion of the cooling liquid throttle solenoid valve 300 is not equal to 20%.
In the embodiment of the invention, manual disassembly is not needed, the opening ratio of the cooling liquid throttling electromagnetic valve is controlled by the EGR upstream temperature collected by the temperature sensor, so that the flow of the cooling liquid flowing into an EGR intercooler is determined, the temperature of the EGR upstream is increased, ice of an EGR system is melted, the deicing timing is started, whether the EGR system control device finishes deicing or not is determined by the deicing timing time and the engine running time, when the deicing timing time is greater than or equal to a first time threshold value or the engine running time is greater than or equal to a second time threshold value, the EGR system control device finishes deicing, and the EGR system is normally started. The ice accumulated in the EGR system is removed under the condition of not needing manual removal, the false alarm fault of the EGR system is further avoided, and the purpose of preventing the engine from being damaged is achieved.
Optionally, based on the EGR system control apparatus shown in the above embodiment of the present invention, in the case where the deicing switch 100 is set, the ECU200 that sets the enable state in the ECU200 to the set state is further configured to: judging whether the ambient temperature is less than or equal to a second preset temperature threshold value or not; and if the ambient temperature is less than or equal to a second preset temperature threshold value, setting the enabling state in the ECU to be a setting state.
In a specific implementation process, the ECU200 determines whether the current engine is in a low-temperature environment according to the ambient temperature of the current engine, so that the ECU200 determines whether the ambient temperature is less than or equal to a second preset temperature threshold, determines that the current engine is in the low-temperature environment if the ambient temperature is less than or equal to the second preset temperature threshold, that is, the current EGR system 400 may be frozen, sets an enable state in the ECU200 to be a set state, and indicates that the EGR system 400 is normally started if the ambient temperature is greater than the second preset temperature threshold.
It should be noted that the second preset temperature threshold may be set through a plurality of experiments, and may also be set according to experience of a person skilled in the art.
In the embodiment of the invention, manual dismantling is not needed, whether the current engine is in a low-temperature environment or not is determined according to the ambient temperature so as to determine whether icing exists in the current EGR system or not, when the ambient temperature is determined to be less than or equal to the second preset temperature threshold value, determining that icing exists in the EGR system at present, so as to control the opening ratio of the cooling liquid throttling electromagnetic valve through the EGR upstream temperature collected by the temperature sensor, thereby determining the flow of the cooling liquid flowing into the EGR intercooler, raising the temperature of the upstream of the EGR so as to melt ice accumulated in the EGR system, and starting a deicing timer, determining whether the EGR system control device finishes deicing according to the deicing timer time and the running time of the engine, and when the deicing timing time is greater than or equal to a first time threshold value or the engine running time is greater than or equal to a second time threshold value, determining that the deicing of the EGR system control device is finished and the EGR system is normally started. The ice accumulated in the EGR system is removed under the condition of not needing manual removal, the false alarm fault of the EGR system is further avoided, and the purpose of preventing the engine from being damaged is achieved.
Optionally, based on the EGR system control apparatus shown in the above embodiment of the present invention, in a case where the deicing switch 100 is set, the ECU that sets the enable state in the ECU to the set state is further configured to: judging whether the temperature of the cooling liquid is less than or equal to a third preset temperature threshold value or not; and if the temperature of the cooling liquid is less than or equal to a third preset temperature threshold value, setting the enabling state in the ECU to be a setting state.
In a specific implementation process, the ECU200 determines whether the current engine is in a low-temperature environment or not by the temperature of the coolant flowing into the EGR intercooler, so that the ECU200 determines whether the temperature of the coolant is less than or equal to a third preset temperature threshold, determines that the current engine is in the low-temperature environment if the temperature of the coolant is less than or equal to the third preset temperature threshold, that is, the current EGR system 400 may be frozen, sets an enable state in the ECU200 to be a set state, and indicates that the EGR system is normally started if the temperature of the coolant is greater than the third preset temperature threshold.
It should be noted that the third preset temperature threshold may be set through a plurality of experiments, or may be set according to experience of a person skilled in the art.
In the embodiment of the invention, manual dismantling is not needed, whether the current engine is in a low-temperature environment or not is determined through the temperature of the coolant, whether the current EGR system is frozen or not is determined, when the temperature of the coolant is determined to be less than or equal to a third preset temperature threshold value, the current EGR system is determined to be frozen, so that the opening proportion of a coolant throttle electromagnetic valve is controlled through the upstream temperature of the EGR collected by a temperature sensor, the flow of the coolant flowing into an EGR intercooler is determined, the upstream temperature of the EGR is increased, the ice formed in the EGR system is melted, a deicing time is started, whether the EGR system control device finishes deicing or not is determined through the deicing time and the operation time of a motor, and when the deicing time is greater than or equal to a first time threshold value or the operation time of the engine is greater than or equal to a second time, the EGR system starts normally. The ice accumulated in the EGR system is removed under the condition of not needing manual removal, the false alarm fault of the EGR system is further avoided, and the purpose of preventing the engine from being damaged is achieved.
Referring to fig. 2, a block diagram of an ECU for controlling an EGR system for detection according to an embodiment of the present invention, the ECU being applied to a detection device of the EGR system, includes: a processor 201 and a memory 202.
The memory 202 stores a computer program, and the processor 201 is configured to execute the computer program stored in the memory 202 to implement the detection of the EGR system, and implement the following procedures:
specifically, the processor executes the computer program stored in the memory to implement the following detection process for the EGR system: acquiring conventional parameters of an EGR system in real time, wherein the conventional parameters comprise EGR upstream temperature, engine running time, engine speed, environment temperature, exhaust temperature and engine coolant temperature; when the deicing switch is set and the enabling state in the ECU is set to be a set state, forbidding the EGR system to operate, and limiting the output torque of the engine to be in a preset range, wherein the forbidding the EGR system to operate is used for indicating to clear the EGR rate and the EGR driving duty ratio in the EGR system and forbidding the detection instruction of the EGR related fault to start; when the upstream temperature of the EGR is greater than or equal to a first preset temperature threshold value, controlling a cooling liquid throttling electromagnetic valve to be fully opened, and starting a deicing timer; judging whether the deicing timing time is greater than or equal to a first time threshold value or judging whether the running time of the engine is greater than or equal to a second time threshold value; and if so, determining that the deicing of the control device of the EGR system is finished, and normally starting the EGR system.
In the embodiment of the invention, manual disassembly is not needed, the opening ratio of the cooling liquid throttling electromagnetic valve is controlled by the EGR upstream temperature collected by the temperature sensor, so that the flow of the cooling liquid flowing into an EGR intercooler is determined, the temperature of the EGR upstream is increased, ice accumulated in the EGR system is melted, the deicing timing is started, whether the EGR system control device finishes deicing or not is determined by the deicing timing time and the engine running time, when the deicing timing time is greater than or equal to a first time threshold value or the engine running time is greater than or equal to a second time threshold value, the EGR system control device finishes deicing, and the EGR system is normally started. The ice accumulated in the EGR system is removed under the condition of not needing manual removal, the false alarm fault of the EGR system is further avoided, and the purpose of preventing the engine from being damaged is achieved.
Based on the above-mentioned EGR system control apparatus, the embodiment of the present invention also discloses an EGR system control method correspondingly, as shown in fig. 3, the method for controlling an EGR system provided in the embodiment of the present invention is applied to an ECU, and the EGR system control method includes:
step S301: and acquiring the conventional parameters of the EGR system in real time.
In step S301, the normal parameters include EGR upstream temperature, engine operating time, engine speed, ambient temperature, exhaust temperature, and engine coolant temperature.
In the process of implementing step S301 specifically, the ECU acquires the EGR upstream temperature collected by the temperature sensor in real time, acquires the ambient temperature, the exhaust temperature, and the engine coolant temperature of the engine collected by other sensors, and acquires the engine operating time and the engine speed in real time.
Step S302: when it is detected that the deicing switch is set and the enable state in the ECU is set to the set state, the EGR system is prohibited from operating and the output torque of the engine is limited to be within a preset range.
In step S302, the EGR system is prohibited from operating for instructing to clear the EGR rate and the EGR drive duty in the EGR system, and the detection instruction of the EGR-related malfunction is prohibited from being started. The first relational table CURVE is a one-dimensional array table.
In the process of specifically implementing step S302, when it is detected that the deicing switch is pressed, it indicates that the deicing switch is set, and when it is detected that the enable state in the ECU set ECU is set, it indicates that the EGR valve of the EGR system is frozen or the EGR system has a fault, so to prevent the problem of the EGR system being started at this time, which may cause the EGR system to have a fault and the engine being damaged, it is necessary to clear the EGR rate and the EGR driving duty ratio in the EGR system, prohibit the detection command for the EGR related fault from being started, and limit the output torque of the engine to be within the preset range, that is, disallow the EGR system from being started.
Step S303: whether the EGR upstream temperature is greater than or equal to a first preset temperature threshold value is judged, if the EGR upstream temperature is greater than or equal to the first preset temperature threshold value, the steps S304, S307 and S308 are executed, and if the EGR upstream temperature is less than the first preset temperature threshold value, the steps S305 and S308 are executed.
In the process of specifically implementing step S303, the water circulation flow passing through the EGR intercooler can be determined by the change of the EGR upstream temperature, and when the engine is in a low temperature condition, the engine is started, and at this time, the intake air temperature of the EGR system, the coolant temperature and the ambient temperature of the engine are all low temperatures, and the engine exhaust gas is rapidly cooled after passing through the EGR intercooler, so that the temperature of the EGR upstream cannot be rapidly deiced, therefore, it is determined whether the EGR upstream temperature is greater than or equal to a first preset temperature threshold, if the EGR upstream temperature is greater than or equal to the first preset temperature threshold, steps S304, S307 to S308 are executed, and if the EGR upstream temperature is less than the first preset temperature threshold, steps S305 to S308 are executed.
Step S304: and controlling a cooling liquid throttling electromagnetic valve to be fully opened, and starting a deicing timer.
In the process of specifically implementing step S304, the ECU controls the coolant throttle solenoid valve to be fully opened, that is, controls the opening ratio of the coolant throttle solenoid valve to be 100%, at this time, the coolant in the coolant water tank flows into the EGR intercooler through the coolant throttle solenoid valve, so that the engine exhaust gas passing through the EGR intercooler is heated, the temperature of the EGR upstream rises, ice of the EGR system starts to melt, and the deicing timing is started.
Step S305: and determining the opening ratio of the cooling liquid throttling electromagnetic valve according to the preset EGR upstream temperature and the EGR upstream temperature.
In the embodiment of the present invention, in performing step S305 to determine the opening ratio of the coolant throttle solenoid valve based on the preset EGR upstream temperature and the EGR upstream temperature, the method includes the steps of:
step S11: a difference between the preset EGR upstream temperature and the EGR upstream temperature is calculated.
In the process of specifically implementing step S11, the EGR upstream temperature written in advance in the memory inside the ECU and the EGR upstream temperature collected by the temperature sensor are calculated to obtain the difference between the preset EGR upstream temperature and the EGR upstream temperature.
Step S12: and outputting a driving duty ratio corresponding to the difference value of the preset EGR upstream temperature and the EGR upstream temperature according to PID closed-loop control.
In the process of specifically implementing step S12, a signal corresponding to the difference between the preset EGR upstream temperature and the EGR upstream temperature is subjected to proportional, integral, or differential operation to obtain a drive duty ratio for driving the opening degree of the coolant throttle solenoid valve.
Optionally, the preset EGR upstream temperature and the EGR upstream temperature can be adjusted by the driving duty ratio output by the PID closed-loop control, so that the preset EGR upstream temperature and the EGR upstream temperature reach a dynamic balance.
Step S13: and determining the opening ratio of the cooling liquid throttling electromagnetic valve according to the driving duty ratio.
Step S306: and controlling the flow of the cooling liquid flowing into the EGR intercooler according to the opening proportion of the cooling liquid throttling electromagnetic valve so as to start deicing timing when the exhaust temperature of the EGR system reaches a first preset temperature threshold value.
In the specific implementation step S306, according to the opening ratio of the coolant throttle solenoid valve, the coolant in the coolant tank flows into the EGR intercooler through the coolant throttle solenoid valve to control the flow rate of the coolant flowing into the EGR intercooler from the coolant tank, so as to heat the engine exhaust passing through the EGR intercooler, that is, the exhaust temperature of the EGR system rises, and when the exhaust temperature of the EGR system reaches a first preset temperature threshold, the temperature at the upstream of the EGR system rises to start melting ice in the EGR system, and a deicing timer is started.
Step S307: and judging whether the deicing timing time is greater than a first time threshold or not, or judging whether the running time of the engine is greater than or equal to a second time threshold or not, if the deicing timing time is greater than or equal to the first time threshold or if the running time of the engine is greater than or equal to the second time threshold, executing the step S308, and if the deicing timing time is less than the first time threshold or if the running time of the engine is less than the second time threshold, returning to execute the step S303.
In step S307, the first time threshold is obtained by querying the second relation table CURVE according to the ambient temperature; the second time threshold is obtained by querying the third relation table CURVE according to the ambient temperature.
Wherein the second relation table CURVE is a one-dimensional array table, the second relation table CURVE being for storing a correspondence between the ambient temperature as an input and the first time threshold as an output; a third relationship table CURVE is also a one-dimensional array table, the third relationship table CURVE for storing a correspondence between an ambient temperature as an input and a second time threshold as an output.
In the embodiment of the present invention, the correspondence between the ambient temperature and the first time threshold is calibrated and written into the memory inside the ECU, and the calibrated ambient temperature sum is stored in the form of the second relation table CURVE. The corresponding relation between the ambient temperature and the second time threshold is calibrated and written into a memory inside the ECU, and the calibrated ambient temperature and the second time threshold are stored in the form of a third relation table CURVE.
In the process of implementing step S307, determining whether the deicing timing time is greater than a first time threshold by using the deicing timing time and the engine running time as a basis for determining whether the EGR system control device completes deicing, or determining whether the engine running time is greater than or equal to a second time threshold, if the deicing timing time is greater than or equal to the first time threshold, or if the engine running time is greater than or equal to the second time threshold, executing step S308, if the deicing timing time is less than the first time threshold, or if the engine running time is less than the second time threshold, determining that the EGR system control device is not completely deiced, at this time, the temperature upstream of the EGR system will continuously rise, and after the temperature rises for a period of time, the ice in the EGR system will be completely melted, and returning to executing step S303.
Step S308: and determining that the control device of the EGR system is deiced and the EGR system is started normally.
During the step S308 of implementing in detail, the temperature upstream of the EGR causes the EGR system to be completely de-iced, so that the EGR system is normally started.
It should be noted that, the specific principle and implementation procedure of the EGR system control method disclosed in the above embodiment of the present invention are the same as those of the EGR system control device implemented in the above embodiment of the present invention, and reference may be made to corresponding parts of the EGR system control device disclosed in the above embodiment of the present invention, which are not described herein again.
In the embodiment of the invention, manual disassembly is not needed, the opening ratio of the cooling liquid throttling electromagnetic valve is controlled by the EGR upstream temperature collected by the temperature sensor, so that the flow of the cooling liquid flowing into an EGR intercooler is determined, the temperature of the EGR upstream is increased, ice accumulated in the EGR system is melted, the deicing timing is started, whether the EGR system control device finishes deicing or not is determined by the deicing timing time and the engine running time, when the deicing timing time is greater than or equal to a first time threshold value or the engine running time is greater than or equal to a second time threshold value, the EGR system control device finishes deicing, and the EGR system is normally started. The ice accumulated in the EGR system is removed under the condition of not needing manual removal, the false alarm fault of the EGR system is further avoided, and the purpose of preventing the engine from being damaged is achieved.
Based on the EGR system control method shown in fig. 3, as shown in fig. 4, a flow chart of the EGR system control method provided by the embodiment of the present invention is shown, and the EGR system control method includes:
step S401: and acquiring the conventional parameters of the EGR system in real time.
In step S401, the normal parameters include EGR upstream temperature, engine operating time, engine speed, ambient temperature, exhaust temperature, and engine coolant temperature.
It should be noted that the specific implementation process of step S401 is the same as the specific implementation process of step S301 shown in the above embodiments, and reference may be made to each other.
Step S402: and when the deicing switch is detected to be set, judging whether the ambient temperature is less than or equal to a second preset temperature threshold, if the ambient temperature is less than or equal to the second preset temperature threshold, executing the step S403, and if the ambient temperature is greater than the second preset temperature threshold, normally starting the EGR system.
In the process of specifically implementing step S402, when it is detected that the deicing switch is pressed, it is indicated that the deicing switch is set, and it is determined whether the current engine is in a low-temperature environment according to the ambient temperature of the current engine, therefore, it is determined whether the ambient temperature is less than or equal to a second preset temperature threshold, if the ambient temperature is less than or equal to the second preset temperature threshold, it is determined that the current engine is in a low-temperature environment, that is, there is a possibility of icing in the current EGR system, step S403 is executed, and if the ambient temperature is greater than the second preset temperature threshold, it is indicated that the EGR system is normally started.
Step S403: the enable state in the ECU is set to a set state.
Step S404: when it is detected that the enable state in the ECU is set to a set state, the EGR system is prohibited from operating, and the output torque of the engine is limited to a preset range.
In step S404, the EGR system operation is prohibited for instructing to clear the EGR rate and the EGR drive duty in the EGR system, and the detection instruction start of the EGR-related malfunction is prohibited.
Step S405: and judging whether the EGR upstream temperature is greater than or equal to a first preset temperature threshold value, if so, executing step S406 and step S409 to step S410, and if not, executing step S407 to step S410.
In the process of specifically implementing step S405, the water circulation flow passing through the EGR intercooler can be determined by the change of the EGR upstream temperature, and when the engine is at an ambient temperature less than or equal to the second temperature threshold, the engine is started, and at this time, the intake air temperature of the EGR system, the coolant temperature, and the ambient temperature of the engine are all low temperatures, and the engine exhaust gas is rapidly cooled after passing through the EGR intercooler, so that the temperature at the EGR upstream cannot be rapidly deiced, therefore, it is determined whether the EGR upstream temperature is greater than or equal to the first preset temperature threshold, if so, step S406, step S409 through step S410 are executed, and if not, step S407 through step S410 are executed.
Step S406: and controlling a cooling liquid throttling electromagnetic valve to be fully opened, and starting a deicing timer.
Step S407: and determining the opening ratio of the cooling liquid throttling electromagnetic valve according to the preset EGR upstream temperature and the EGR upstream temperature.
Step S408: and controlling the flow of the cooling liquid flowing into the EGR intercooler according to the opening proportion of the cooling liquid throttling electromagnetic valve so as to start deicing timing when the exhaust temperature of the EGR system reaches a first preset temperature threshold value.
Step S409: and judging whether the deicing timing time is greater than a first time threshold or not, or judging whether the engine running time is greater than or equal to a second time threshold or not, if so, executing the step S410, and if not, returning to execute the step S405.
Step S410: and determining that the control device of the EGR system is deiced and the EGR system is started normally.
It should be noted that the specific implementation process of step S404 to step S410 is the same as the specific implementation process of step S302 to step S308 shown in the above embodiments, and reference may be made to each other.
In the embodiment of the invention, manual dismantling is not needed, whether the current engine is in a low-temperature environment or not is determined according to the ambient temperature so as to determine whether icing exists in the current EGR system or not, when the ambient temperature is determined to be less than or equal to the second preset temperature threshold value, determining that icing exists in the EGR system at present, so as to control the opening ratio of the cooling liquid throttling electromagnetic valve through the EGR upstream temperature collected by the temperature sensor, thereby determining the flow of the cooling liquid flowing into the EGR intercooler, raising the temperature of the upstream of the EGR so as to melt ice accumulated in the EGR system, and starting a deicing timer, determining whether the EGR system control device finishes deicing according to the deicing timer time and the running time of the engine, and when the deicing timing time is greater than or equal to a first time threshold value or the engine running time is greater than or equal to a second time threshold value, determining that the deicing of the EGR system control device is finished and the EGR system is normally started. The ice accumulated in the EGR system is removed under the condition of not needing manual removal, the false alarm fault of the EGR system is further avoided, and the purpose of preventing the engine from being damaged is achieved.
Based on the EGR system control method shown in fig. 3, as shown in fig. 5, a flow chart of the EGR system control method provided by the embodiment of the present invention is shown, and the EGR system control method includes:
step S501: and acquiring the conventional parameters of the EGR system in real time.
In step S501, the normal parameters include EGR upstream temperature, engine operating time, engine speed, ambient temperature, exhaust temperature, and engine coolant temperature.
It should be noted that the specific implementation process of step S501 is the same as the specific implementation process of step S301 shown in the above embodiments, and reference may be made to each other.
Step S502: and when the deicing switch is set, judging whether the temperature of the coolant is less than or equal to a third preset temperature threshold, if so, executing a step S503, and if so, normally starting the EGR system.
In the specific implementation process of step S502, when it is detected that the deicing switch is pressed, it is indicated that the deicing switch is set, and it is determined whether the current engine is in a low-temperature environment or not by the temperature of the coolant flowing through the EGR intercooler, therefore, it is determined whether the temperature of the coolant is less than or equal to a third preset temperature threshold, if the temperature of the coolant is less than or equal to the third preset temperature threshold, it is determined that the current engine is in a low-temperature environment, that is, there is a possibility of icing in the current EGR system, step S503 is executed, and if the temperature of the coolant is greater than the third preset temperature threshold, it is indicated that the.
It should be noted that the third preset temperature threshold may be set through a plurality of experiments, or may be set according to experience of a person skilled in the art.
Step S503: the enable state in the ECU is set to a set state.
Step S504: when it is detected that the enable state in the ECU is set to a set state, the EGR system is prohibited from operating, and the output torque of the engine is limited to a preset range.
In step S504, the EGR system is prohibited from operating for instructing to clear the EGR rate and the EGR drive duty in the EGR system, and the detection instruction of the EGR-related malfunction is prohibited from being started.
Step S505: and judging whether the EGR upstream temperature is greater than or equal to a first preset temperature threshold value, if so, executing the steps S506 and S509 to S510, and if not, executing the steps S507 to S510.
In the process of specifically implementing step S505, the water circulation flow passing through the EGR intercooler can be determined according to the change of the EGR upstream temperature, and when the temperature of the coolant of the engine is less than or equal to the third temperature threshold, the engine is started, at this time, the intake air temperature of the EGR system, the coolant temperature and the ambient temperature of the engine are all low temperatures, and the engine exhaust gas is rapidly cooled after passing through the EGR intercooler, so that the temperature at the EGR upstream cannot be rapidly deiced, therefore, it is determined whether the EGR upstream temperature is greater than or equal to the first preset temperature threshold, if so, steps S506, S509 to S510 are executed, and if not, steps S507 to S510 are executed.
Step S506: and controlling a cooling liquid throttling electromagnetic valve to be fully opened, and starting a deicing timer.
Step S507: and determining the opening ratio of the cooling liquid throttling electromagnetic valve according to the preset EGR upstream temperature and the EGR upstream temperature.
Step S508: and controlling the flow of the cooling liquid flowing into the EGR intercooler according to the opening proportion of the cooling liquid throttling electromagnetic valve so as to start deicing timing when the exhaust temperature of the EGR system reaches a first preset temperature threshold value.
Step S509: and judging whether the deicing timing time is greater than a first time threshold or not, or judging whether the engine running time is greater than or equal to a second time threshold or not, if so, executing the step S510, and if not, returning to the step S505.
Step S510: and determining that the control device of the EGR system is deiced and the EGR system is started normally.
It should be noted that the specific implementation process of step S504 to step S510 is the same as the specific implementation process of step S302 to step S308 shown in the above embodiments, and reference may be made to each other.
In the embodiment of the invention, manual dismantling is not needed, whether the current engine is in a low-temperature environment or not is determined through the temperature of the coolant to determine whether the current EGR system is frozen or not, when the temperature of the coolant is determined to be less than or equal to a third preset temperature threshold value, the current EGR system is determined to be frozen, so that the opening proportion of a coolant throttle electromagnetic valve is controlled through the upstream temperature of the EGR collected by a temperature sensor, the flow of the coolant flowing into an EGR intercooler is determined, the upstream temperature of the EGR is increased to melt the ice accumulated in the EGR system, a deicing time is started, whether the EGR system control device finishes deicing is determined through the deicing timing time and the running time of the engine, and when the deicing timing time is greater than or equal to a first time threshold value or the running time of the engine is greater than or equal to a second time threshold value, the EGR system starts normally. The ice accumulated in the EGR system is removed under the condition of not needing manual removal, the false alarm fault of the EGR system is further avoided, and the purpose of preventing the engine from being damaged is achieved.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
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 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 (10)

1. An EGR system control method is applicable to an EGR system control device, the EGR system control device comprises a deicing switch, an ECU, a coolant throttling electromagnetic valve and an EGR system, the deicing switch is connected with the ECU, the coolant throttling electromagnetic valve is arranged in a water inlet pipeline of the EGR system and used for controlling the flow of coolant water flowing into an EGR intercooler, and the method comprises the following steps:
acquiring conventional parameters of an EGR system in real time, wherein the conventional parameters comprise EGR upstream temperature, engine running time, engine rotating speed, environment temperature, exhaust temperature and engine coolant temperature;
when the fact that the deicing switch is set and an enabling state in an ECU is set to be a set state is detected, the EGR system is forbidden to operate, the output torque of an engine is limited to be within a preset range, wherein the prohibition of the operation of the EGR system is used for indicating that an EGR rate and an EGR driving duty ratio in the EGR system are cleared, and the detection instruction of EGR related faults is forbidden to start;
when the upstream temperature of the EGR is greater than or equal to a first preset temperature threshold value, controlling the cooling liquid throttling electromagnetic valve to be fully opened, and starting a deicing timer;
judging whether the deicing timing time is greater than or equal to a first time threshold value or judging whether the running time of the engine is greater than or equal to a second time threshold value;
and if the temperature is larger than or equal to the preset temperature, determining that the deicing of the EGR system control device is finished, and normally starting the EGR system.
2. The method of claim 1, further comprising:
when the EGR upstream temperature is lower than a first preset temperature threshold value, determining the opening ratio of the cooling liquid throttling electromagnetic valve according to the preset EGR upstream temperature and the EGR upstream temperature;
and controlling the flow of the cooling liquid flowing into the EGR intercooler according to the opening proportion of the cooling liquid throttling electromagnetic valve so as to start deicing timing when the exhaust temperature of the EGR system reaches a first preset temperature threshold value.
3. The method according to claim 2, wherein the determining the opening ratio of the coolant throttle solenoid valve based on a preset EGR upstream temperature and the EGR upstream temperature includes:
calculating a difference value between the preset EGR upstream temperature and the EGR upstream temperature;
outputting a driving duty ratio corresponding to the difference value of the preset EGR upstream temperature and the EGR upstream temperature according to PID closed-loop control;
and determining the opening ratio of the cooling liquid throttling electromagnetic valve according to the driving duty ratio.
4. The method of claim 1, further comprising:
and if the deicing timing time is less than a first time threshold, or the engine running time is less than a second time threshold, executing a step of judging whether the EGR upstream temperature is greater than or equal to a first preset temperature threshold.
5. The method of claim 1, wherein setting the enable state in the ECU to the set state with the de-icing switch set comprises:
judging whether the environment temperature is less than or equal to a second preset temperature threshold value or not;
if the ambient temperature is less than or equal to a second preset temperature threshold value, setting an enabling state in the ECU to be a setting state;
and/or judging whether the temperature of the cooling liquid is less than or equal to a third preset temperature threshold value or not;
and if the temperature of the cooling liquid is less than or equal to a third preset temperature threshold value, setting the enabling state in the ECU to be a setting state.
6. The EGR system control device is characterized by comprising a deicing switch, an ECU, a cooling liquid throttling electromagnetic valve and an EGR system;
the deicing switch is connected with the ECU, and the ECU is connected with the EGR system;
the cooling liquid throttling electromagnetic valve is arranged in a water inlet pipeline of the EGR system and used for controlling the flow of cooling liquid water flowing into an EGR intercooler;
the ECU is configured to: acquiring conventional parameters of an EGR system in real time, wherein the conventional parameters comprise EGR upstream temperature, engine running time, engine rotating speed, environment temperature, exhaust temperature and engine coolant temperature; when the fact that the deicing switch is set and an enabling state in an ECU is set to be a set state is detected, the EGR system is forbidden to operate, the output torque of an engine is limited to be within a preset range, wherein the prohibition of the operation of the EGR system is used for indicating that an EGR rate and an EGR driving duty ratio in the EGR system are cleared, and the detection instruction of EGR related faults is forbidden to start; when the upstream temperature of the EGR is greater than or equal to a first preset temperature threshold value, controlling the cooling liquid throttling electromagnetic valve to be fully opened, and starting a deicing timer; judging whether the deicing timing time is greater than or equal to a first time threshold value or judging whether the running time of the engine is greater than or equal to a second time threshold value; and if the temperature is larger than or equal to the preset temperature, determining that the deicing of the EGR system control device is finished, and normally starting the EGR system.
7. The apparatus of claim 6, wherein the ECU is further configured to: when the EGR upstream temperature is lower than a first preset temperature threshold value, determining the opening ratio of the cooling liquid throttling electromagnetic valve according to the preset EGR upstream temperature and the EGR upstream temperature; and controlling the flow of the cooling liquid flowing into the EGR intercooler according to the opening proportion of the cooling liquid throttling electromagnetic valve so as to start deicing timing when the exhaust temperature of the EGR system reaches a first preset temperature threshold value.
8. The apparatus according to claim 7, characterized in that the ECU determining the opening ratio of the coolant throttle solenoid valve on the basis of a preset EGR upstream temperature and the EGR upstream temperature is specifically configured to: calculating a difference value between the preset EGR upstream temperature and the EGR upstream temperature; outputting a driving duty ratio corresponding to the difference value of the preset EGR upstream temperature and the EGR upstream temperature according to PID closed-loop control; and determining the opening ratio of the cooling liquid throttling electromagnetic valve according to the driving duty ratio.
9. The apparatus according to claim 6, wherein, in case the deicing switch is set, the ECU of the ECU that sets the enable state to the set state is specifically configured to: judging whether the environment temperature is less than or equal to a second preset temperature threshold value or not; if the ambient temperature is less than or equal to a second preset temperature threshold value, setting an enabling state in the ECU to be a setting state; and/or judging whether the temperature of the cooling liquid is less than or equal to a third preset temperature threshold value or not; and if the temperature of the cooling liquid is not more than a third preset temperature threshold value, setting the enabling state in the ECU to be a setting state.
10. An Electronic Control Unit (ECU), characterized in that the ECU comprises: a processor and a memory, the memory having stored therein a computer program, the processor executing the computer program to implement the EGR system control method of any of claims 1 to 5.
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CN114076041A (en) * 2020-08-18 2022-02-22 深圳臻宇新能源动力科技有限公司 Control method and control system of EGR valve
CN112523877B (en) * 2020-10-21 2022-08-30 广西玉柴机器股份有限公司 Control method for high-pressure exhaust gas recirculation cooling bypass valve
CN113685278B (en) * 2021-09-29 2022-10-28 潍柴动力股份有限公司 EGR control method and device
CN114352445B (en) * 2021-12-14 2023-01-24 潍柴动力股份有限公司 EGR valve assembly, engine with EGR valve assembly and control method of engine
CN115013116A (en) * 2022-06-24 2022-09-06 东风汽车集团股份有限公司 Vehicle and engine protection device, control method and computer equipment

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1469171B1 (en) * 2003-04-15 2007-05-30 Nissan Motor Company, Limited Internal combustion engine with blow-by gas recirculation system
CN107542555A (en) * 2016-06-28 2018-01-05 上汽通用汽车有限公司 Vehicle exhaust recirculating system opens ice mode control method
CN208473954U (en) * 2018-06-28 2019-02-05 无锡沃尔福汽车技术有限公司 A kind of external gs-oil separator arragement construction
CN109374309A (en) * 2018-11-09 2019-02-22 吉林大学 Exhaust gas recycles intercooler heat exchange efficiency testing stand and its control method
CN110454268A (en) * 2019-07-16 2019-11-15 玉柴联合动力股份有限公司 A kind of engine and cooler for recycled exhaust gas parallel connection cooling system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1469171B1 (en) * 2003-04-15 2007-05-30 Nissan Motor Company, Limited Internal combustion engine with blow-by gas recirculation system
CN107542555A (en) * 2016-06-28 2018-01-05 上汽通用汽车有限公司 Vehicle exhaust recirculating system opens ice mode control method
CN208473954U (en) * 2018-06-28 2019-02-05 无锡沃尔福汽车技术有限公司 A kind of external gs-oil separator arragement construction
CN109374309A (en) * 2018-11-09 2019-02-22 吉林大学 Exhaust gas recycles intercooler heat exchange efficiency testing stand and its control method
CN110454268A (en) * 2019-07-16 2019-11-15 玉柴联合动力股份有限公司 A kind of engine and cooler for recycled exhaust gas parallel connection cooling system

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