CN113686588A - 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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- 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 idle in situ until the engine reaches a first water temperature threshold and a first air inlet temperature threshold; accelerating an engine to reach a first engine power threshold and a first torque threshold for starting an EGR system within a first time threshold, and acquiring a state detection result of the EGR system; based on the state detection result, determining the icing risk of the EGR system operating in the current cold environment. The engine heat is smaller when idling in situ, icing or condensation disappearance caused by too high temperature of the EGR system before the EGR system enters the starting working condition of the EGR system is avoided, meanwhile, cold air blowing in a cold environment does not exist in the engine room in the idling in situ, the air inlet temperature of the engine can be gradually improved, and the reliability of the test is further improved.
Description
Technical Field
The invention relates to the technical field of automobile tests, in particular to a test method and a test device of an EGR (exhaust gas recirculation) system in a cold environment.
Background
The Exhaust Gas Recirculation (EGR) technology of the engine is realized based on an EGR system of an internal combustion engine vehicle, which means that part of Exhaust Gas of the engine is returned to an air inlet 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 under the condition of a cold environment, the water vapor is easy to condense and freeze in the EGR system, so that the working failure of the EGR system is caused, and the running safety, emission and oil consumption of a vehicle are influenced; it can be seen that cold ambient conditions have high requirements for the start conditions of the EGR system, and these start conditions and the risk of icing are contradictory, which makes the stability of the EGR system in cold ambient difficult to evaluate.
Therefore, how to accurately evaluate the icing risk of the vehicle EGR system under the cold environment condition is an urgent problem to be solved at present.
Disclosure of Invention
The test method and the test device of the EGR system in the cold environment can accurately evaluate the icing risk of the EGR system of the vehicle under the condition of the cold environment.
In a first aspect, an embodiment of the present invention provides the following:
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 idle in situ until the engine reaches a first water temperature threshold and a first air inlet temperature threshold;
accelerating an engine to reach a first engine power threshold and a first torque threshold for starting an EGR system within a first time threshold, and acquiring a state detection result of the EGR system;
based on the state detection result, determining the icing risk of the EGR system operating in the current cold environment.
In one possible embodiment, after accelerating the engine to a first engine power threshold and a first torque threshold for turning on the EGR system within a first time threshold, further comprising:
and controlling the vehicle to stop and shut down after the temperature of the air outlet of the EGR system is not lower than a first temperature threshold value.
In a possible embodiment, the method of calculating the first temperature threshold comprises:
obtaining a first volume of water vapor of exhaust gas exhausted by the vehicle and a pressure of gas 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 the gas pressure;
and inquiring the first temperature threshold corresponding to the partial pressure value based on a preset comparison table.
In a possible embodiment, after the vehicle is shut down, the method further comprises:
and testing after the temperature of the air outlet is not higher than a second temperature threshold value.
In one possible embodiment, the controlling the vehicle to idle in situ until the engine reaches the first water temperature threshold and the first intake air temperature threshold further includes:
checking whether a valve of the EGR system can be normally opened or not and whether condensation or icing exists at an air outlet of the EGR system 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 idle in situ.
In one possible embodiment, the controlling the vehicle to idle in situ until the engine reaches the first water temperature threshold and the first intake air temperature threshold includes:
starting the vehicle and carrying out in-situ idling operation;
adjusting the warm air speed of the vehicle, and controlling the water temperature of the engine to rise to the first water temperature threshold within a second time threshold;
until the water temperature and the intake air temperature of the engine reach a first water temperature threshold and a first intake air temperature threshold.
In one possible embodiment, the status detection result includes: condensed water or ice exists in a drain hole of the EGR system, and the condensed water or ice does not exist in the drain hole of the EGR system; the determining the risk of icing for the EGR system operating in the current cold environment includes:
if so, determining that the EGR system runs in the current cold environment and has a risk of icing;
and if not, determining that the EGR system operates in the current cold environment without icing risk.
In one possible embodiment, the status detection result includes: the temperature difference of the air outlet of the EGR system in the current cold environment relative to the common environment; the determining the risk of icing for the EGR system operating in the 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 and has the risk of icing;
and if the temperature difference of the air outlet is not more than 20 ℃, the EGR system does not have the risk of icing when running in the current cold environment.
In one possible embodiment, the status detection result includes: the air outlet pressure difference of the EGR system in the current cold environment relative to the common environment; judging whether the EGR system runs in the current cold environment and has icing risk or not, comprising 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 and has the risk of icing;
and if the air pressure difference of the air outlet is not more than 10KPa, the EGR system does not have the risk of icing when running in the current cold environment.
In one possible embodiment, the test method is applied to a cold environment of the vehicle below-20 ℃.
In a second aspect, based on the same inventive concept, an embodiment of the present invention further provides a test apparatus for an EGR system in a cold environment, where the apparatus includes:
the first control module is used for controlling the vehicle to idle in situ until the engine reaches a first water temperature threshold and a first air inlet temperature threshold;
the second control module is used for controlling the vehicle to accelerate the engine within a first time threshold value to reach a first engine power threshold value and a first torque threshold value for starting the EGR system, and acquiring a state detection result of the EGR system;
a first determination module to determine a risk of icing for the EGR system operating in a current cold environment based on the status detection.
In a third aspect, based on the same inventive concept, an embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the steps of the method in any one of the first aspect.
Compared with the prior art, the test method and the test device for the EGR system in the cold environment have the following advantages that:
1. and controlling the vehicle to run in an idle mode until the engine reaches a first water temperature threshold and a first air inlet temperature threshold. The engine heat is less when idling in situ, and the temperature of the EGR system is too high to cause icing or condensation to disappear before the EGR system enters the starting working condition of the EGR system, and meanwhile, cold air blowing in a cold environment does not exist in the engine room in the idling in situ, the air inlet temperature of the engine can be gradually improved, and the reliability of the test is further improved.
2. Accelerating the engine to reach a first engine power threshold and a first torque threshold for starting the EGR system within a first time threshold, and obtaining a state detection result of the EGR system. The engine of the vehicle can quickly enter the EGR system in the process of rapid acceleration, the condition that the air inlet temperature of the engine is quickly reduced to lose the starting condition of the EGR system along with the entering of cold air when the vehicle runs in a cold environment is avoided, and the reliability of the test is further improved.
3. Based on the state detection result, determining the icing risk of the EGR system operating in the current cold environment. After the vehicle enters the EGR system in a cold environment, the icing risk of the EGR system of the vehicle in the cold environment is accurately evaluated, 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 starting condition of the EGR, the EGR can be effectively started and run, and the starting temperature of the EGR system is within the risk temperature range.
Drawings
In order to more clearly illustrate the embodiments of the present specification or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present specification, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method for testing an EGR system in a cold environment according to an embodiment of the present invention;
FIG. 2 is a "temperature comparison table of saturated water and saturated vapor pressure" provided by an embodiment of the present invention;
FIG. 3 is a timing diagram illustrating a method for testing 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 described clearly and completely with reference to the accompanying 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, rather than all embodiments, and all other embodiments obtained by those skilled in the art based on the embodiments of the present invention belong to the scope of protection of the embodiments of the present invention.
Referring to fig. 1, fig. 1 is a flowchart illustrating a testing method of an EGR system in a cold environment according to an embodiment of the present invention, which specifically includes steps 11 to 13.
Step 11, controlling the vehicle to idle in situ until the engine reaches a first water temperature threshold and a first air inlet temperature threshold;
and step 13, determining the icing risk of the EGR system in the current cold environment based on the state detection result.
Specifically, the in-situ idle running of the vehicle is that the engine of the vehicle runs without load under the condition of a neutral gear, the accelerator pedal of the vehicle is completely loosened, the engine only needs to overcome the friction resistance of internal parts of the engine, and does not output power externally, the in-situ idle running of the vehicle can be understood and controlled, manual driving control or automatic driving control can be realized, and the vehicle can run under the working condition. After the operation of the engine reaches a first water temperature threshold and a first air inlet temperature threshold, controlling the vehicle to start, accelerating the engine to reach a first engine power threshold and a first torque threshold for starting an EGR system within a first time threshold, and enabling the vehicle to start 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 EGR system can be started in situ idle running in a static state of the vehicle, the water temperature and the air inlet temperature of the engine reach the starting conditions, and then the EGR system is accelerated rapidly to improve the engine power and the torque to reach the starting conditions of the EGR system, so that the vehicle can be ensured to start the EGR system in a cold environment. The first water temperature threshold, the first intake air 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 certainly, 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 started after the engine reaches the working condition of the set threshold.
The method comprises the steps that normally, a state detection result of an EGR system is obtained through data acquisition equipment, the data acquisition equipment is installed on a test vehicle before a test, and each sensor of the data acquisition equipment is installed at a corresponding position of the vehicle, so that each running parameter of the vehicle can be monitored at any time in the test process; in addition, a temperature sensor is arranged at an air outlet of a cooler of the EGR system to acquire the air outlet temperature of the EGR system, the temperature sensor feeds collected temperature data back to the data acquisition equipment, the data acquisition equipment records and displays the data, and the freezing risk of the EGR system in the current cold environment is determined not to be limited to be judged based on the air outlet temperature, and the method is specifically explained below.
In one possible embodiment, after accelerating the engine to a first engine power threshold and a first torque threshold for turning on the EGR system within a first time threshold, further comprising:
and 14, controlling the vehicle to stop and shut down 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 chosen flexibly based on the experience or practice of the skilled person, typically being greater than or equal to 60 ℃.
In a possible embodiment, the method of calculating the first temperature threshold comprises:
obtaining a first volume of water vapor of exhaust gas exhausted by the vehicle and a pressure of gas 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 the gas pressure;
based on a preset comparison table, inquiring the first temperature threshold corresponding to the partial pressure value; the preset comparison table can be a 'saturated water and saturated steam pressure temperature comparison table', as shown in fig. 2.
Taking ethanol gasoline as an example, the chemical formula of combustion of gasoline is as follows: c5H12+8O2＝5CO2+6H2O；
The chemical formula for ethanol combustion: c2H6O+3O2＝2CO2+3H2O; the components in the air are as follows: 21% O2，78％N21% other gases, assuming negligible water vapor in the air, O in the air2Total conversion to CO2And H2O, H in exhaust gas after combustion2The maximum content of O by mass is 11.89%, and H in the burned exhaust gas2The maximum content of O in volume is 18.5 percent, the pressure of gas entering the EGR system is approximate to the standard atmospheric pressure, the standard atmospheric pressure is selected for calculation,h in exhaust gas after combustion2The partial pressure of O was 18.5 kpa.
The first temperature threshold value is reasonably selected by inquiring a 'saturated water and saturated steam pressure temperature comparison table'.
In a possible embodiment, after the vehicle is shut down, 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 freezing and re-testing after the vehicle is stopped and flamed out is to cool the EGR system, the load of the engine rises after the vehicle enters the test working condition of the EGR system, the temperature of the EGR system rises rapidly, condensed water can evaporate after the temperature of the EGR system exceeds a target value, the accuracy of a test result is further influenced, and a second temperature threshold is selected to be-10 ℃ under the common condition.
In one possible embodiment, the controlling the vehicle to idle in situ until the engine reaches the first water temperature threshold and the first intake air temperature threshold further includes:
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 idle in situ.
The valve of the EGR system is arranged at the position of an air inlet 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 through a channel opened by the valve to participate in combustion (namely the EGR system is opened); and the air outlet of the EGR system is not condensed or frozen, so that the position of the air outlet is not too low in temperature, and the influence on the test accuracy caused by the influence of the water vapor discharged from the air outlet is avoided.
In one possible embodiment, the controlling the vehicle to idle in situ until the engine reaches the first water temperature threshold and the first intake air temperature threshold includes:
starting the vehicle and carrying out in-situ idling operation;
adjusting the warm air speed of the vehicle, and controlling the water temperature of the engine to rise to the first water temperature threshold within a second time threshold;
until the water temperature and the intake air temperature of the engine reach a first water temperature threshold and a first intake air temperature threshold.
The second time threshold is the time when the air inlet temperature of the engine reaches the first air inlet temperature threshold, the water temperature of the engine is increased rapidly under normal conditions, the increase rate of the air inlet temperature is relatively slow, and if the water temperature of the engine is increased too high, the cooling effect of the 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 warm air speed of the vehicle is adjusted to effectively avoid the water temperature of an engine from rising too fast, the warm air speed can be adjusted according to the time when the inlet air temperature reaches a first inlet air temperature threshold value, the adjustment mode is manual or automatic, the rotating speed of a vehicle warm air fan is adjusted, and the first water temperature threshold value is more than or equal to 60 ℃.
The following three ways to determine whether there is a risk of icing when the EGR system is operating in the current cold environment will be specifically described:
in one possible embodiment, the status detection result includes: condensed water or ice exists in a drain hole of the EGR system, and the condensed water or ice does not exist in the drain hole of the EGR system; the determining the risk of icing for the EGR system operating in the current cold environment includes:
if so, determining that the EGR system runs in the current cold environment and has a risk of icing;
and if not, determining that the EGR system operates in the current cold environment without icing risk.
The drain hole is arranged at the bottom of the EGR system and communicated with the air outlet, the preferred structure of the drain hole is a threaded hole, a hole blocking screw on the drain hole is detached during test so as to observe whether condensed water or ice exists in the drain hole of the EGR system, and the screw is installed in the drain hole under the normal state of the vehicle.
In one possible embodiment, the status detection result includes: the temperature difference of the air outlet of the EGR system in the current cold environment relative to the common environment; the determining the risk of icing for the EGR system operating in the 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 and has the risk of icing;
and if the temperature difference of the air outlet is not more than 20 ℃, the EGR system does not have the risk of icing when running in the current cold environment.
It can be understood that the temperature of the air outlet in the current cold environment is 20 ℃ or higher than that of the air outlet in the common environment, which indicates that the EGR system runs in the current cold environment and has the risk of icing; and if the temperature is not lower than the preset temperature, the EGR system operates in the current cold environment without icing risk.
In one possible embodiment, the status detection result includes: the air outlet pressure difference of the EGR system in the current cold environment relative to the common environment; judging whether the EGR system runs in the current cold environment and has icing risk or not, comprising 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 and has the risk of icing;
and if the air pressure difference of the air outlet is not more than 10KPa, the EGR system does not have the risk of icing when running in the current cold environment.
The air pressure of an air outlet in the current cold environment is less than the air pressure of the air outlet in the common environment by more than 10KPa, which shows that the water vapor of the gas discharged from the air outlet is partially condensed into a solid state, and the EGR system runs in the current cold environment and has a risk of icing; if not, the EGR system operates in the current cold environment without the risk of icing. The air pressure at the air outlet can be acquired by an air pressure sensor, and the air pressure sensor is connected with data acquisition equipment. And judging the temperature difference and the air pressure difference of the air outlet based on the temperature and pressure data obtained by the test of the current cold environment and the common environment, wherein the common environment is the temperature and pressure data of the air outlet tested by the vehicle under 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 starting condition of the EGR system in the running process of the vehicle in the cold environment, the EGR system can be effectively started and operated, and the temperature of the EGR system is in the risk temperature range. Other approaches fail to simultaneously satisfy all EGR opening conditions while the temperature of the EGR system is within the risk temperature range. Therefore, the method can verify whether the EGR system is started to have the risk of icing or not under the severe cold, severe cold or extremely cold conditions of the vehicle, and further evaluate the running safety of the vehicle.
Fig. 3 is a timing chart of a method for testing an EGR system in a cold environment according to an embodiment of the present invention, where the test time is performed in units of days. During the test, the vehicle is started, is in idle running in situ, and judges whether the water temperature reaches the starting condition of EGR (system);
if not, continuing to operate in an idle mode in situ;
if so, continuously judging whether the air inlet temperature of the engine reaches the opening condition of the EGR system, if not, starting vehicle warm air, 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 inlet air temperature reaches the starting condition of the EGR system, quickly starting and accelerating to a preset EGR starting working condition, stably operating the EGR starting working condition, collecting the temperature of an air outlet of the EGR system, and judging whether the temperature of an EGR measuring point (air outlet) exceeds 60 ℃;
if not, continuously and stably operating the EGR starting working condition;
if yes, the engine is stopped and is frozen to the temperature of the EGR measuring point to be minus 10 ℃, and then the test is repeated until the test is finished in the same day.
Based on the same inventive concept as the method, an embodiment of the present invention provides a test apparatus for an EGR system in a cold environment, and as shown in fig. 4, the apparatus includes:
the first control module 101 is used for controlling the vehicle to idle in situ until the engine reaches a first water temperature threshold and a first air inlet temperature threshold;
the second control module 102 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;
a first determination module 103 is configured to determine a risk of icing for the EGR system operating in the current cold environment based on the status detection result.
In a possible embodiment, the apparatus further comprises:
and the third control module is used for controlling the vehicle to stop and shut down after the temperature of the air outlet of the EGR system is not lower than the first temperature threshold.
In a possible embodiment, the apparatus further comprises a first calculation module that calculates a first temperature threshold, the first calculation module comprising:
the first acquisition module is used for acquiring a first water vapor volume of exhaust gas discharged by the vehicle and a gas pressure entering the EGR system;
a second obtaining module, configured to obtain 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 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 a possible embodiment, the apparatus further comprises:
and the third acquisition module is used for acquiring the temperature of the gas outlet, and performing a test after the temperature of the gas outlet is not higher than a second temperature threshold value.
In a 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 condensation or icing exists at an air outlet of the EGR system or not;
the first execution module is used for executing the step of controlling the vehicle to idle in situ when a valve of the EGR system can be opened normally and an air outlet of the EGR system is not condensed or frozen.
In one possible embodiment, the first control module comprises:
the first operation module is used for starting the vehicle and performing on-site idling 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 within a second time threshold; until the water temperature and the intake air temperature of the engine reach a first water temperature threshold and a first intake air temperature threshold.
In one possible embodiment, the status detection result includes: condensed water or ice exists in a drain hole of the EGR system, and the condensed water or ice does not exist in the drain hole of the EGR system; the first determining module includes:
the first determining unit is used for determining that the EGR system runs in the current cold environment and has icing risk if the EGR system runs in the current cold environment;
and the second determining unit is used for determining that the EGR system does not have the icing risk when running in the current cold environment if the EGR system does not exist.
In one 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 common environment; the first determining module further includes:
the third determining unit is used for determining that the EGR system has the risk of icing when running in the current cold environment if the temperature difference of the air outlet is more than 20 ℃;
and the fourth determining unit is used for operating the EGR system 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 a computer program stored thereon, which, when executed by a processor, implements any of the steps in the above-described method embodiments.
As will be appreciated by one skilled in the art, 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 flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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. Therefore, it is intended that the appended claims be interpreted as including 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 changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method of testing an EGR system in a cold environment, the method comprising:
controlling the vehicle to idle in situ until the engine reaches a first water temperature threshold and a first air inlet temperature threshold;
accelerating an engine to reach a first engine power threshold and a first torque threshold for starting an EGR system within a first time threshold, and acquiring a state detection result of the EGR system;
based on the state detection result, determining the icing risk of the EGR system operating in the current cold environment.
2. The cold environment EGR system testing method of claim 1, wherein after accelerating the engine to a first engine power threshold and a first torque threshold for starting the EGR system within a first time threshold, further comprising:
and controlling the vehicle to stop and shut down after the temperature of the air outlet of the EGR system is not lower than a first temperature threshold value.
3. The cold environment EGR system testing method of claim 2, wherein said first temperature threshold is calculated by:
obtaining a first volume of water vapor of exhaust gas exhausted by the vehicle and a pressure of gas 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 the gas pressure;
and inquiring the first temperature threshold corresponding to the partial pressure value based on a preset comparison table.
4. The cold environment EGR system test method of claim 3, wherein after said vehicle is shut down and turned off, further comprising:
and testing after the temperature of the air outlet is not higher than a second temperature threshold value.
5. The cold environment EGR system test method of claim 1, wherein said controlling vehicle idle-in-place operation 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 condensation or icing exists at an air outlet of the EGR system 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 idle in situ.
6. The cold environment EGR system test method of claim 1, wherein said controlling vehicle idle-in-place operation until engine reaches a first water temperature threshold and a first intake air temperature threshold comprises:
starting the vehicle and carrying out in-situ idling operation;
adjusting the warm air speed of the vehicle, and controlling the water temperature of the engine to rise to the first water temperature threshold within a second time threshold;
until the water temperature and the intake air temperature of the engine reach a first water temperature threshold and a first intake air temperature threshold.
7. The cold environment EGR system test method of claim 1, wherein said condition detection result comprises: condensed water or ice exists in a drain hole of the EGR system, and the condensed water or ice does not exist in the drain hole of the EGR system; the determining the risk of icing for the EGR system operating in the current cold environment includes:
if so, determining that the EGR system runs in the current cold environment and has a risk of icing;
and if not, determining that the EGR system operates in the current cold environment without icing risk.
8. The cold environment EGR system test method of claim 1, wherein said condition detection result comprises: the temperature difference of the air outlet of the EGR system in the current cold environment relative to the common environment; the determining the risk of icing for the EGR system operating in the 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 and has the risk of icing;
and if the temperature difference of the air outlet is not more than 20 ℃, the EGR system does not have the risk of icing when running in the current cold environment.
9. A test apparatus for an EGR system in a cold environment, the apparatus comprising:
the first control module is used for controlling the vehicle to idle in situ until the engine reaches a first water temperature threshold and a first air inlet temperature threshold;
the second control module is used for controlling the vehicle to accelerate the engine within a first time threshold value to reach a first engine power threshold value and a first torque threshold value for starting the EGR system, and acquiring a state detection result of the EGR system;
a first determination module to determine a risk of icing for the EGR system operating in a current cold environment based on the status detection.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, is adapted to carry out the steps of the method of any one of claims 1 to 8.
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| CN115420505A (en) * | 2022-08-24 | 2022-12-02 | 东风汽车集团股份有限公司 | Test method and test device for exhaust gas recirculation system of engine |
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