CN113686588B - Test method and device for EGR system in cold environment - Google Patents
Test method and device for EGR system in cold environment Download PDFInfo
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- CN113686588B CN113686588B CN202110808439.7A CN202110808439A CN113686588B CN 113686588 B CN113686588 B CN 113686588B CN 202110808439 A CN202110808439 A CN 202110808439A CN 113686588 B CN113686588 B CN 113686588B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses a test method and a test device of an EGR system in a cold environment, wherein the method comprises the following steps: controlling the vehicle to perform in-situ idle running until the engine reaches a first water temperature threshold value and a first air inlet temperature threshold value; accelerating an engine within a first time threshold to reach a first engine power threshold and a first torque threshold for starting an EGR system, and acquiring a state detection result of the EGR system; and determining the icing risk of the EGR system running in the current cold environment based on the state detection result. The engine has smaller heat during the in-situ idling, so that the situation that the freezing or condensation disappears due to the fact that the temperature of the EGR system is too high before the EGR system enters the working condition of opening the EGR system is avoided, meanwhile, cold air blowing in a cold environment does not exist in the in-situ idling cabin, the air inlet temperature of the engine can be gradually increased, and further the reliability of the test is improved.
Description
Technical Field
The invention relates to the technical field of automobile tests, in particular to a test method and device of an EGR system in a cold environment.
Background
An Exhaust Gas Recirculation (EGR) technology of an engine is realized based on an EGR system of an internal combustion engine vehicle, and refers to a technology of returning part of Exhaust Gas of the engine to an air intake system to participate in combustion, and the Exhaust Gas recirculation technology can effectively improve the fuel economy of the engine.
However, the recirculated exhaust gas contains a large amount of water vapor, and the water vapor is easy to condense and freeze in the EGR system under the cold environment condition, so that the EGR system is invalid in operation, and the operation safety, emission and oil consumption of the vehicle are affected; it can be seen that cold ambient conditions have high demands on the opening conditions of the EGR system, which are contradictory with the risk of icing, making the stability of the EGR system in cold environments difficult to evaluate.
Therefore, how to accurately evaluate the risk of icing of a vehicle EGR system in cold ambient conditions is a current challenge.
Disclosure of Invention
The invention relates to a test method and a test device for an EGR system in a cold environment, which are used for accurately evaluating the icing risk of the vehicle EGR system in the cold environment.
In a first aspect, the present embodiment provides the following solutions:
the embodiment of the invention provides a test method of an EGR system in a cold environment, which comprises the following steps:
controlling the vehicle to perform in-situ idle running until the engine reaches a first water temperature threshold value and a first air inlet temperature threshold value;
accelerating an engine within a first time threshold to reach a first engine power threshold and a first torque threshold for starting an EGR system, and acquiring a state detection result of the EGR system;
and determining the icing risk of the EGR system running in the current cold environment based on the state detection result.
In one possible embodiment, after accelerating the engine within the first time threshold to reach the first engine power threshold and the first torque threshold to turn on the EGR system, further comprises:
and controlling the vehicle to stop and flameout after the temperature of the air outlet of the EGR system is not lower than a first temperature threshold value.
In one possible embodiment, the method for calculating the first temperature threshold includes:
acquiring a first water vapor volume of exhaust gas from the vehicle and a gas pressure entering the EGR system;
obtaining a partial pressure value of the first water vapor volume in the EGR system based on the first water vapor volume and a gas pressure;
and inquiring the first temperature threshold corresponding to the partial pressure value based on a preset comparison table.
In one possible embodiment, after the vehicle is stopped and extinguished, the method further comprises:
and after the temperature of the air outlet is not higher than the second temperature threshold value, performing a test.
In one possible embodiment, the controlling the vehicle to idle in place until the engine reaches the first water temperature threshold and the first intake air temperature threshold further comprises:
checking whether a valve of the EGR system can be normally opened or not and whether a gas outlet of the EGR system is condensed or frozen or not;
and if the valve of the EGR system can be normally opened and the air outlet of the EGR system is not condensed or frozen, executing the step of controlling the vehicle to perform in-situ idle running.
In one possible embodiment, the controlling the vehicle to idle in place until the engine reaches a first water temperature threshold and a first intake air temperature threshold comprises:
the vehicle is started and runs at an idle speed in situ;
adjusting the warm air speed of the vehicle, and controlling the water temperature of the engine to rise to the first water temperature threshold value within a second time threshold value;
until the water temperature and the air inlet temperature of the engine reach a first water temperature threshold value and a first air inlet temperature threshold value.
In a possible embodiment, the status detection result includes: condensed water or ice is formed in the drain hole of the EGR system, and the condensed water or ice is not formed in the drain hole of the EGR system; the determining a risk of icing for the EGR system operating in a current cold environment includes:
if so, determining that the EGR system runs in the current cold environment and has a freezing risk;
if not, determining that the EGR system is operated in the current cold environment without the risk of icing.
In a possible embodiment, the status detection result includes: the temperature difference of an air outlet of the EGR system in the current cold environment relative to the temperature difference of an air outlet in a common environment; the determining a risk of icing for the EGR system operating in a current cold environment includes:
if the temperature difference of the air outlet is more than 20 ℃, the EGR system runs in the current cold environment with the icing risk;
and if the temperature difference of the air outlet is not more than 20 ℃, the EGR system runs in the current cold environment without the risk of icing.
In a possible embodiment, the status detection result includes: an outlet differential pressure of the EGR system in the current cold environment relative to a common environment; judging whether the EGR system runs in the current cold environment and has icing risk or not, wherein the method comprises the following steps of:
if the air pressure difference of the air outlet is larger than 10KPa, the EGR system runs in the current cold environment with icing risk;
and if the air pressure difference of the air outlet is not more than 10KPa, the EGR system runs in the current cold environment without icing risk.
In one possible embodiment, the test method is applied to a cold environment of the vehicle below-20 ℃.
According to a second aspect, based on the same inventive concept, an embodiment of the present invention further provides a test device for an EGR system in a cold environment, the device including:
the first control module is used for controlling the vehicle to perform in-situ idle running until the engine reaches a first water temperature threshold value and a first air inlet temperature threshold value;
the second control module is used for controlling the vehicle to accelerate the engine within a first time threshold to reach a first engine power threshold and a first torque threshold for starting the EGR system, and acquiring a state detection result of the EGR system;
and the first determining module is used for determining the icing risk of the EGR system running in the current cold environment based on the state detection result.
In a third aspect, based on the same inventive concept, embodiments of the present invention also provide a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method of any of the first aspects.
Compared with the prior art, the test method and the test device of the EGR system in the cold environment have the following advantages:
1. by controlling the vehicle to idle in situ until the engine reaches a first water temperature threshold and a first intake air temperature threshold. The engine heat is smaller in the in-situ idling process, the situation that freezing or condensation disappears due to the fact that the temperature of the EGR system is too high before the EGR system is started is avoided, meanwhile, cold air blowing in a cold environment does not exist in an in-situ idling cabin, the air inlet temperature of the engine can be gradually increased, and further the reliability of a test is improved.
2. Accelerating the engine within a first time threshold to reach a first engine power threshold and a first torque threshold for opening the EGR system, and acquiring a state detection result of the EGR system. The vehicle engine can quickly enter the EGR system in the rapid acceleration process, so that the condition that the opening condition of the EGR system is lost due to the fact that the air inlet temperature of the engine is quickly reduced along with the cold air entering along with the running of the vehicle in a cold environment is avoided, and the reliability of the test is further improved.
3. And determining the icing risk of the EGR system running in the current cold environment based on the state detection result. After a vehicle enters the EGR system in a cold environment, the icing risk of the vehicle EGR system in the cold environment is accurately estimated, and test data support is provided for driving safety in the cold environment; meanwhile, the method can ensure that the vehicle runs under the cold condition, the working condition of the engine meets the opening condition of the EGR, the EGR can be effectively opened and operated, and the opening temperature of the EGR system is in the risk temperature range.
Drawings
In order to more clearly illustrate the embodiments of the present description or the technical solutions in the prior art, the drawings that are required for the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present description, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a test method of an EGR system in a cold environment provided by an embodiment of the present invention;
FIG. 2 is a table showing the comparison of saturated water and saturated steam pressure and temperature according to the embodiment of the present invention;
FIG. 3 is a timing diagram of a test method for an EGR system in a cold environment according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a test device of an EGR system in a cold environment 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 apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the embodiments of the present invention.
Referring to fig. 1, fig. 1 is a flowchart of a test method of an EGR system in a cold environment according to an embodiment of the present invention, and specifically includes steps 11 to 13.
Step 11, controlling the vehicle to perform in-situ idle running until the engine reaches a first water temperature threshold value and a first air inlet temperature threshold value;
and step 13, determining the icing risk of the EGR system running in the current cold environment based on the state detection result.
Specifically, the vehicle in-situ idle running is that the engine of the vehicle runs without load under the neutral condition, the accelerator pedal of the vehicle is completely released, the engine only needs to overcome the friction resistance of internal parts of the engine, the external output power is not needed, the vehicle in-situ idle running can be understood and controlled, and the vehicle can be driven manually or automatically. After the operation of the engine reaches a first water temperature threshold and a first air inlet temperature threshold, controlling the vehicle to start, and accelerating the engine within a first time threshold to reach a first engine power threshold and a first torque threshold for starting an EGR system so that the vehicle starts the EGR system; because the EGR system is started after the vehicle is not lower than a certain water temperature, air inlet temperature, engine power and torque, the vehicle can firstly perform idle running in situ in a stationary state, the water temperature and the air inlet temperature of the engine reach the starting conditions, and then the engine is rapidly accelerated to improve the engine power and torque, so that the starting conditions of the EGR system are achieved, and the EGR system can be started in a cold environment of the vehicle. One skilled in the art can understand that the first water temperature threshold, the first air inlet temperature threshold, the first time threshold, the first engine power threshold and the first torque threshold can be flexibly selected based on experience or actual conditions of technicians, and of course, calibration tests can be performed on the vehicle in the current cold environment, so that an accurate set threshold is obtained, and the EGR system is ensured to be started after the engine reaches the working condition of the set threshold.
Under the normal condition, the state detection result of the EGR system is obtained through a data acquisition device, the data acquisition device is arranged on a test vehicle before the test, and each sensor of the data acquisition device is arranged at a corresponding position of the vehicle so as to monitor each running parameter of the vehicle at any time in the test process; in addition, a temperature sensor is arranged at the air outlet of the cooler of the EGR system to acquire the air outlet temperature of the EGR system, the temperature sensor feeds back acquired temperature data to the data acquisition equipment, the data acquisition equipment records and displays the acquired temperature data, and the icing risk of the EGR system running in the current cold environment is determined not to be limited to judgment based on the air outlet temperature, and the icing risk is specifically described below.
In one possible embodiment, after accelerating the engine within the first time threshold to reach the first engine power threshold and the first torque threshold to turn on the EGR system, further comprises:
and 14, controlling the vehicle to stop and flameout after the temperature of the air outlet of the EGR system is not lower than a first temperature threshold value.
The first temperature threshold may be flexibly selected based on experience or actual conditions of the technician, and in general, the first temperature threshold is greater than or equal to 60 ℃.
In one possible embodiment, the method for calculating the first temperature threshold includes:
acquiring a first water vapor volume of exhaust gas from the vehicle and a gas pressure entering the EGR system;
obtaining a partial pressure value of the first water vapor volume in the EGR system based on the first water vapor volume and a gas pressure;
inquiring the first temperature threshold corresponding to the partial pressure value based on a preset comparison table; the predetermined reference table may be "reference table of saturated water and saturated steam pressure and temperature", as shown in fig. 2.
Taking ethanol gasoline as an example, the chemical formula of gasoline combustion is as follows: c (C) 5 H 12 +8O 2 ＝5CO 2 +6H 2 O；
The chemical formula of ethanol combustion: c (C) 2 H 6O +3O 2 ＝2CO 2 +3H 2 O; the components in the air are as follows: 21% O 2 ，78％N 2 1% of other gases, assuming negligible vapor in the air, O in the air 2 All conversion to CO 2 And H 2 O, H in the exhaust gas after combustion 2 The highest content of O is 11.89%, H in the waste gas after combustion 2 The highest content of O is 18.5%, the pressure of gas entering the EGR system is similar to the standard atmospheric pressure, standard atmospheric pressure is selected for calculation, and H in the burnt waste gas 2 The partial pressure of O was 18.5kpa.
By inquiring the comparison table of saturated water and saturated steam pressure and temperature, it is reasonable to choose 60 ℃ for the first temperature threshold.
In one possible embodiment, after the vehicle is stopped and extinguished, the method further comprises:
and step 15, testing after the temperature of the air outlet is not higher than a second temperature threshold value.
The test is carried out after the vehicle stops and extinguishes, so as to cool the EGR system, the engine load rises after the vehicle enters the test working condition of the EGR system, the temperature of the EGR system rises rapidly, condensed water evaporates after the target value is exceeded, the accuracy of the test result is affected, and the second temperature threshold is minus 10 ℃ under normal conditions.
In one possible embodiment, the controlling the vehicle to idle in place until the engine reaches the first water temperature threshold and the first intake air temperature threshold further comprises:
and if the valve of the EGR system can be normally opened and the air outlet of the EGR system is not condensed or frozen, executing the step of controlling the vehicle to perform in-situ idle running.
The valve of the EGR system is arranged at the air inlet position of the EGR system, the valve can be normally opened to indicate that the hardware has no fault, and after the engine reaches the working condition of opening the EGR system, part of exhaust gas of the engine returns to the air inlet system to participate in combustion (namely, the EGR system is opened) through a channel of opening the valve; the air outlet of the EGR system is free from condensation or icing, so that the air outlet position is free from excessively low temperature, and the influence on the water vapor discharged from the air outlet and the accuracy of the test are avoided.
In one possible embodiment, the controlling the vehicle to idle in place until the engine reaches a first water temperature threshold and a first intake air temperature threshold comprises:
the vehicle is started and runs at an idle speed in situ;
adjusting the warm air speed of the vehicle, and controlling the water temperature of the engine to rise to the first water temperature threshold value within a second time threshold value;
until the water temperature and the air inlet temperature of the engine reach a first water temperature threshold value and a first air inlet temperature threshold value.
The second time threshold is a time when the air inlet temperature of the engine reaches the first air inlet temperature threshold, the water temperature of the engine is generally increased at a relatively high speed, the air inlet temperature is increased at a relatively low speed, and if the water temperature of the engine is increased too high, the cooling effect of cooling water on the engine is reduced, so that the stability of the test is easily affected. Because the warm air of the vehicle is blown into the vehicle based on the heat of the cooling water, the excessive rapid rising of the water temperature of the engine is effectively avoided by adjusting the warm air speed of the vehicle, the warm air speed can be adjusted according to the time when the air inlet temperature reaches the first air inlet temperature threshold value, the adjustment mode is manual or automatic, the rotating speed of the warm air fan of the vehicle is adjusted, and the first water temperature threshold value is more than or equal to 60 ℃.
Determining whether the EGR system is operating in the current cold environment is at risk of icing will be described in more detail below in conjunction with the following three ways:
in a possible embodiment, the status detection result includes: condensed water or ice is formed in the drain hole of the EGR system, and the condensed water or ice is not formed in the drain hole of the EGR system; the determining a risk of icing for the EGR system operating in a current cold environment includes:
if so, determining that the EGR system runs in the current cold environment and has a freezing risk;
if not, determining that the EGR system is operated in the current cold environment without the risk of icing.
The drain hole is set up in the bottom of EGR system, communicates with the gas outlet, and the preferential structure of drain hole is the screw hole, dismantles the stifled hole screw on the drain hole during the test to whether the drain hole of EGR system exists comdenstion water or freezes, and the screw is installed to in the drain hole under the vehicle normal condition.
In a possible embodiment, the status detection result includes: the temperature difference of an air outlet of the EGR system in the current cold environment relative to the temperature difference of an air outlet in a common environment; the determining a risk of icing for the EGR system operating in a current cold environment includes:
if the temperature difference of the air outlet is more than 20 ℃, the EGR system runs in the current cold environment with the icing risk;
and if the temperature difference of the air outlet is not more than 20 ℃, the EGR system runs in the current cold environment without the risk of icing.
It can be appreciated that the current cold environment air outlet temperature is 20 ℃ or more below the air outlet temperature in the ordinary environment, which means that the EGR system runs in the current cold environment with the risk of icing; if not, the EGR system runs in the current cold environment without the risk of icing.
In a possible embodiment, the status detection result includes: an outlet differential pressure of the EGR system in the current cold environment relative to a common environment; judging whether the EGR system runs in the current cold environment and has icing risk or not, wherein the method comprises the following steps of:
if the air pressure difference of the air outlet is larger than 10KPa, the EGR system runs in the current cold environment with icing risk;
and if the air pressure difference of the air outlet is not more than 10KPa, the EGR system runs in the current cold environment without icing risk.
The air pressure of the air outlet of the current cold environment is more than 10KPa below the air pressure of the air outlet in the common environment, which indicates that partial condensation of gas vapor discharged from the air outlet is solid, and the EGR system runs in the current cold environment with icing risk; if not, the EGR system runs in the current cold environment without the risk of icing. The air pressure of the air outlet can be acquired through an air pressure sensor, and the air pressure sensor is connected with data acquisition equipment. The judgment of the temperature difference of the air outlet and the air pressure difference of the air outlet should be based on the temperature and pressure data obtained by testing the current cold environment and the common environment, wherein the common environment is the air outlet temperature and pressure data tested by the vehicle in the normal temperature environment (10-25 ℃).
In one possible embodiment, the test method is applied to a cold environment of the vehicle below-20 ℃.
The method can ensure that the working condition of the engine meets the opening condition of the EGR system in the running process of the vehicle in a cold environment, the EGR system can be effectively opened and operated, and the temperature of the EGR system is in a risk temperature range. Other approaches fail to meet all EGR opening conditions simultaneously, while the temperature of the EGR system is within a risk temperature range. Therefore, the invention can verify whether the vehicle has icing risk or not under severe cold, extremely cold or extremely cold conditions, and further evaluate the running safety of the vehicle.
Referring to fig. 3, fig. 3 is a timing chart of a test method of an EGR system in a cold environment according to an embodiment of the present invention, where test time is performed in days. When in test, the vehicle is started, and the vehicle runs at idle speed in situ, and whether the water temperature reaches the start condition of EGR (System) or not is judged;
if not, continuing the in-situ idle running;
if so, continuing to judge whether the air inlet temperature of the engine reaches the opening condition of the EGR system, if not, starting warm air of the vehicle, keeping the water temperature at the opening condition, and waiting for the air inlet temperature of the engine to rise to the opening condition of the EGR system; if the air inlet temperature reaches the opening condition of the EGR system, rapidly starting and accelerating to a preset EGR opening working condition, stably operating the EGR opening working condition, collecting the air outlet temperature of the EGR system, and judging whether the temperature of an EGR measuring point (air outlet) exceeds 60 ℃;
if not, continuing to stably operate the EGR opening working condition;
if yes, the engine is stopped and frozen to the temperature of the EGR measuring point of minus 10 ℃, and the test is repeated until the test is finished on the same day.
Based on the same inventive concept as the method, an embodiment of the present invention provides a test device for an EGR system in a cold environment, as shown in fig. 4, which is a schematic structural diagram of an embodiment of the device, and the device includes:
a first control module 101 for controlling the vehicle to perform in-situ idle operation until the engine reaches a first water temperature threshold and a first intake air temperature threshold;
the second control module 102 is configured to control the vehicle to accelerate the engine within a first time threshold to reach a first engine power threshold and a first torque threshold for opening the EGR system, and obtain a state detection result of the EGR system;
a first determination module 103 is configured to determine a risk of icing for the EGR system operating in a current cold environment based on the status detection result.
In one possible embodiment, the apparatus further comprises:
and the third control module is used for controlling the vehicle to stop and flameout after the temperature of the air outlet of the EGR system is not lower than a first temperature threshold value.
In one possible embodiment, the apparatus further comprises a first calculation module that calculates a first temperature threshold, the first calculation module comprising:
a first acquisition module for acquiring a first water vapor volume of exhaust gas from the vehicle and a gas pressure entering the EGR system;
a second acquisition module for acquiring a partial pressure value of the first water vapor volume in the EGR system based on the first water vapor volume and a gas pressure;
the first query module is used for querying the first temperature threshold corresponding to the partial pressure value based on a preset comparison table.
In one possible embodiment, the apparatus further comprises:
and the third acquisition module is used for acquiring the temperature of the air outlet, and performing a test after the temperature of the air outlet is not higher than the second temperature threshold value.
In one possible embodiment, the apparatus further comprises:
the first checking module is used for checking whether a valve of the EGR system can be normally opened or not and whether a gas outlet of the EGR system is condensed or frozen or not;
and the first execution module is used for executing the step of controlling the vehicle to perform in-situ idle running when the valve of the EGR system can be normally opened and the air outlet of the EGR system is not condensed or frozen.
In one possible embodiment, the first control module includes:
the first operation module is used for starting the vehicle and performing in-situ idle operation;
the fourth control module is used for adjusting the warm air speed of the vehicle and controlling the water temperature of the engine to rise to the first water temperature threshold value within the second time threshold value; until the water temperature and the air inlet temperature of the engine reach a first water temperature threshold value and a first air inlet temperature threshold value.
In a possible embodiment, the status detection result includes: condensed water or ice is formed in the drain hole of the EGR system, and the condensed water or ice is not formed in the drain hole of the EGR system; the first determining module includes:
a first determining unit, configured to determine that there is a risk of icing when the EGR system is operating in a current cold environment, if present;
and the second determining unit is used for determining that the EGR system runs in the current cold environment without icing risk if the EGR system does not exist.
In a possible embodiment, the status detection result includes: the temperature difference of an air outlet of the EGR system in the current cold environment relative to the temperature difference of an air outlet in the ordinary environment; the first determining module further includes:
the third determining unit is used for enabling the EGR system to run in the current cold environment with icing risk if the temperature difference of the air outlet is larger than 20 ℃;
and the fourth determining unit is used for enabling the EGR system to operate in the current cold environment without icing risk if the temperature difference of the air outlet is not more than 20 ℃.
Based on the same inventive concept as the method, an embodiment of the present invention provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, realizes any of the steps of the method embodiments described above.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (modules, systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (8)
1. A method of testing an EGR system in a cold environment, the method comprising:
controlling the vehicle to perform in-situ idle running until the engine reaches a first water temperature threshold value and a first air inlet temperature threshold value;
accelerating an engine within a first time threshold to reach a first engine power threshold and a first torque threshold for starting an EGR system, and acquiring a state detection result of the EGR system;
determining the icing risk of the EGR system running in the current cold environment based on the state detection result;
the state detection result comprises: condensed water or ice is formed in the drain hole of the EGR system, and the condensed water or ice is not formed in the drain hole of the EGR system; the determining a risk of icing for the EGR system operating in a current cold environment includes:
if so, determining that the EGR system runs in the current cold environment and has a freezing risk;
if the risk of icing does not exist, determining that the EGR system runs in the current cold environment;
or (b)
The state detection result comprises: the temperature difference of an air outlet of the EGR system in the current cold environment relative to the temperature difference of an air outlet in a common environment; the determining a risk of icing for the EGR system operating in a current cold environment includes:
if the temperature difference of the air outlet is more than 20 ℃, the EGR system runs in the current cold environment with the icing risk;
and if the temperature difference of the air outlet is not more than 20 ℃, the EGR system runs in the current cold environment without the risk of icing.
2. The method of claim 1, wherein accelerating the engine within a first time threshold after reaching a first engine power threshold and a first torque threshold to turn on the EGR system further comprises:
and controlling the vehicle to stop and flameout after the temperature of the air outlet of the EGR system is not lower than a first temperature threshold value.
3. The method for testing an EGR system in a cold environment according to claim 2, wherein the first temperature threshold calculation method includes:
acquiring a first water vapor volume of exhaust gas from the vehicle and a gas pressure entering the EGR system;
obtaining a partial pressure value of the first water vapor volume in the EGR system based on the first water vapor volume and a gas pressure;
and inquiring the first temperature threshold corresponding to the partial pressure value based on a preset comparison table.
4. A method of testing an EGR system in a cold environment according to claim 3, further comprising, after said vehicle has been shut down:
and after the temperature of the air outlet is not higher than the second temperature threshold value, performing a test.
5. The method of claim 1, wherein controlling the vehicle to idle in place until the engine reaches the first water temperature threshold and the first intake temperature threshold further comprises:
checking whether a valve of the EGR system can be normally opened or not and whether a gas outlet of the EGR system is condensed or frozen or not;
and if the valve of the EGR system can be normally opened and the air outlet of the EGR system is not condensed or frozen, executing the step of controlling the vehicle to perform in-situ idle running.
6. The method of claim 1, wherein controlling the vehicle to idle in place until the engine reaches a first water temperature threshold and a first intake air temperature threshold comprises:
the vehicle is started and runs at an idle speed in situ;
adjusting the warm air speed of the vehicle, and controlling the water temperature of the engine to rise to the first water temperature threshold value within a second time threshold value;
until the water temperature and the air inlet temperature of the engine reach a first water temperature threshold value and a first air inlet temperature threshold value.
7. An apparatus for testing an EGR system in a cold environment, the apparatus comprising:
the first control module is used for controlling the vehicle to perform in-situ idle running until the engine reaches a first water temperature threshold value and a first air inlet temperature threshold value;
the second control module is used for controlling the vehicle to accelerate the engine within a first time threshold to reach a first engine power threshold and a first torque threshold for starting the EGR system, and acquiring a state detection result of the EGR system;
the first determining module is used for determining the icing risk of the EGR system running in the current cold environment based on the state detection result;
the state detection result comprises: condensed water or ice is formed in the drain hole of the EGR system, and the condensed water or ice is not formed in the drain hole of the EGR system; the first determining module includes:
a first determining unit, configured to determine that there is a risk of icing when the EGR system is operating in a current cold environment, if present;
the second determining unit is used for determining that the EGR system runs in the current cold environment without icing risk if the EGR system does not exist;
or (b)
The state detection result comprises: the temperature difference of an air outlet of the EGR system in the current cold environment relative to the temperature difference of an air outlet in the ordinary environment; the first determining module includes:
the third determining unit is used for enabling the EGR system to run in the current cold environment with icing risk if the temperature difference of the air outlet is larger than 20 ℃;
and the fourth determining unit is used for enabling the EGR system to operate in the current cold environment without icing risk if the temperature difference of the air outlet is not more than 20 ℃.
8. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program is executed by a processor to implement the steps of the method of any of claims 1 to 6.
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| JP4510655B2 (en) * | 2005-02-02 | 2010-07-28 | 本田技研工業株式会社 | Exhaust gas purification device for internal combustion engine |
| JP4500765B2 (en) * | 2005-11-16 | 2010-07-14 | 本田技研工業株式会社 | Exhaust gas purification device for internal combustion engine |
| JP4333725B2 (en) * | 2006-10-25 | 2009-09-16 | トヨタ自動車株式会社 | Exhaust gas recirculation device for internal combustion engine |
| US20090249783A1 (en) * | 2008-04-04 | 2009-10-08 | General Electric Company | Locomotive Engine Exhaust Gas Recirculation System and Method |
| JP2013151868A (en) * | 2012-01-24 | 2013-08-08 | Hino Motors Ltd | Blocking detection method and device of egr cooler |
| US9389144B2 (en) * | 2013-06-13 | 2016-07-12 | Hyundai Motor Company | Method for diagnosing EGR system |
| JP6155951B2 (en) * | 2013-08-12 | 2017-07-05 | マツダ株式会社 | Engine control device and vehicle control device |
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| CN107542555B (en) * | 2016-06-28 | 2019-10-25 | 上汽通用汽车有限公司 | Vehicle exhaust recirculating system ice-breaking mode control method |
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