CN114166514A - Test system and test method for simulating plateau environment expansion valve cooling liquid steam escape - Google Patents
Test system and test method for simulating plateau environment expansion valve cooling liquid steam escape Download PDFInfo
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- CN114166514A CN114166514A CN202111419359.9A CN202111419359A CN114166514A CN 114166514 A CN114166514 A CN 114166514A CN 202111419359 A CN202111419359 A CN 202111419359A CN 114166514 A CN114166514 A CN 114166514A
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
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- G01M15/09—Testing internal-combustion engines by monitoring pressure in fluid ducts, e.g. in lubrication or cooling parts
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
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- G01M15/048—Testing internal-combustion engines by monitoring a single specific parameter not covered by groups G01M15/06 - G01M15/12 by monitoring temperature
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- 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 provides a test system and a test method for simulating the escape of cooling liquid vapor of an expansion valve in a plateau environment, which simulate the working boundary of a practical plateau condition expansion valve by taking the pressure of a simulated plateau pipeline system as the backpressure of the expansion valve; taking a rear pressure detection parameter of a water pump of the diesel engine as a safe operation control boundary of the diesel engine; simulating the working condition of heat accumulation of a real vehicle by taking the transient acceleration process of the diesel engine as a verification process; taking the steam flow between the expansion water tank and the expansion valve as a characteristic parameter of the steam escape of the cooling liquid designed by the starting pressure of the expansion valve; after the final test is optimized, the pressure behind the water pump is within the control limit range, and the steam flow is 0. The test system and the test method for simulating the plateau environment expansion valve cooling liquid steam escape have positive effects on capturing the nonequilibrium heat accumulation moment of the diesel engine, and can also evaluate the matching performance of the automotive thermostat.
Description
Technical Field
The invention belongs to the technical field of engine testing, and particularly relates to a test system and a test method for simulating plateau environment expansion valve coolant vapor escape.
Background
When a vehicle runs in a plateau area, the volume flow of air participating in heat dissipation is in direct proportion to the rotating speed of a cooling fan, and the mass of cooling air is reduced under the same volume flow due to the reduction of atmospheric density, so that the heat transferred from a radiator is reduced, and the heat is seriously accumulated in a diesel engine body and a cooling system. If the opening pressure of an expansion valve of a diesel engine cooling system of a vehicle is selected according to a plateau area, the vehicle is accelerated to run under a large load of a plateau environment, hot steam accumulated by the cooling system escapes, the cooling performance of the diesel engine is migrated or insufficient due to evaporation escape of cooling liquid, and the thermal state of the diesel engine changes and generates unstable conditions. When the completely closed scheme is adopted to inhibit the evaporation escape of the cooling liquid, the internal pressure of the cooling system is increased, and the pressure parameter behind the water pump of the diesel engine is increased, so that the internal sealing element of the diesel engine runs at an excessive temperature and an excessive pressure, the internal cooling liquid is leaked, and the service life of the diesel engine is influenced.
In order to verify the inhibition effect of the pressure design of the expansion valve on the escape of the cooling liquid and simultaneously consider the adaptability of the pressure parameter of the rear part of the water pump of the diesel engine, the steam escape test of the cooling liquid of the expansion valve is a necessary test content for the plateau simulation of the bench simulation of the diesel engine. Under the condition of controlling the pressure parameter of the diesel engine water pump, the working characteristic of the steam deflation valve in the plateau actual environment operation state of the diesel engine can be analyzed by detecting the vaporization evaporation quantity parameter of the cooling liquid, so that the starting pressure is reasonably designed, the deflation working requirement of the expansion water tank is met, and the cooling boundary of the diesel engine under the plateau actual environment operation condition is ensured.
The conventional plateau simulation system of the high-power diesel engine mainly simulates air intake and exhaust and cannot achieve full-environment simulation due to the limitation of condition construction cost. The plateau environment of the real vehicle is reproduced through a plateau test bed for intake and exhaust simulation, and the thermal state of the diesel engine is required to be in an unbalanced state. The existing GJB5464.1 standard plateau test method is a stability verification method, when a simulated plateau environment test bench operates according to the test method, the cooling heat dissipation capacity of a diesel engine and the heat dissipation capacity of a cooling system of a test room are balanced, the thermal state of the diesel engine is in a balanced state, and an expansion valve cannot generate a cooling escape phenomenon.
Disclosure of Invention
In view of the above, the invention aims to provide a test system for simulating the escape of refrigerant liquid vapor of an expansion valve in a plateau environment, so as to solve the problems that the verification of the cooling performance of a diesel engine under the simulated environment condition is insufficient, and the escape of refrigerant liquid at different starting pressures of the expansion valve under the actual plateau condition is difficult to detect.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a test system for simulating plateau environment expansion valve cooling liquid steam escape comprises an intercooler and a controller, wherein the controller is respectively connected with a first pressure sensor, a first temperature sensor, a water pump rear pressure monitoring point, a second flow meter, a second temperature sensor, a first regulating valve, a second regulating valve, a first flow meter, an evaporation amount testing device, a flow regulating valve, a third temperature sensor and a second pressure sensor in a signal mode; the intercooler is connected to an inlet of the diesel engine body 4 through a second pipeline, an outlet end pipeline of the diesel engine body 4 is connected to the thermostat, a second high-level air release port is arranged in front of the intercooler and the thermostat, the second high-level air release port is connected to the first pipeline through a third pipeline, and a second regulating valve is installed on the third pipeline, so that the second high-level air release port is connected to the expansion water tank through the second regulating valve and the first flow meter in sequence to form a hot steam collecting channel of the diesel engine body; the inlet end of the thermostat is connected to the inlet end of a water pump, the inlet end of the water pump is provided with a first temperature sensor and a first pressure sensor, the outlet end of the water pump is connected to the inlet of a diesel engine body 4 through an engine oil heat exchanger, the outlet of the thermostat is connected to an auxiliary device through a fourth pipeline, and a second temperature sensor and a second flowmeter are arranged on the fourth pipeline; the auxiliary device is used for assisting the system to normally operate; the expansion tank is connected to plateau analog pressure through the evaporation capacity testing device and the expansion valve in sequence, and the expansion tank is provided with a third temperature sensor and a second pressure sensor.
Furthermore, a water pump rear pressure monitoring point is arranged on one side of the water pump and used for monitoring the safe operation of the diesel engine.
Furthermore, the auxiliary device comprises a cooling system heat exchanger, a water filter, a manual regulating valve and a flow regulating valve, one end of the cooling system heat exchanger is connected to the thermostat through a fourth pipeline, the other end of the cooling system heat exchanger is connected to an inlet of the water pump, the cooling system heat exchanger is connected to the external source main water supply pipe through the water filter, and the manual regulating valve is installed on the external source main water supply pipe; the cooling system heat exchanger is also connected to an external source total water return pipe through a pipeline, and a flow regulating valve is installed on the external source total water return pipe.
Compared with the prior art, the test system for simulating the escape of the refrigerant liquid steam of the plateau environment expansion valve has the following advantages:
(1) the test system for simulating the plateau environment expansion valve cooling liquid steam escape is suitable for being directly transformed and used on the existing test bed, does not need to customize a complex detection system, and meets general requirements.
(2) The plateau environment simulation expansion valve cooling liquid steam escape test system can be used for evaluating cooling evaporation escape amount verification under different expansion valve opening pressures under plateau use conditions of a diesel engine, is safe and reliable in test process, and cannot cause the condition of burning of the diesel engine.
The invention also aims to provide a test method for simulating the steam escape of the cooling liquid of the plateau environment expansion valve so as to solve the problems of the evaporation escape of the cooling liquid and the damage and leakage misjudgment of a cooling system in the real vehicle environment.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a test method for simulating the escape of steam of expansion valve coolant in plateau environment is mainly characterized in that the heat energy generated by a diesel engine and the heat energy dissipated by a cooling system of a test room are in a non-equilibrium state during verification of the simulated plateau environment. Simulating the working boundary of the plateau condition expansion valve of the real vehicle by taking the simulated plateau pipeline system pressure as the back pressure of the expansion valve; taking a rear pressure detection parameter of a water pump of the diesel engine as a safe operation control boundary of the diesel engine; simulating the working condition of heat accumulation of a real vehicle by taking the transient acceleration process of the diesel engine as a verification process; and taking the steam flow between the expansion water tank and the expansion valve as a characteristic parameter of the steam escape of the cooling liquid designed by the starting pressure of the expansion valve. After the final test is optimized, the pressure behind the water pump is within the control limit range, and the steam flow is 0; the method comprises the following steps:
s1, testing a cooling boundary, and debugging;
s2, simulating test conditions after debugging in the step S1;
and S3, processing and judging the data in the step S2.
Further, the method for debugging the cooling boundary in the step S1 includes:
s11, starting the diesel engine, entering a heat engine working condition, adjusting the altitude environment of the plateau simulation system to a target verification environment when the temperature of the lubricating oil reaches a performance test condition allowed to be developed, operating the diesel engine on a rated point rotating speed working condition, and starting test cooling boundary debugging;
s12, gradually reducing the opening degrees of the first regulating valve and the second regulating valve through the controller until the difference value obtained by subtracting the indication value of the first pressure sensor from the indication value of the second pressure sensor is 0, and simultaneously the numerical value of the first flowmeter is not 0;
s13, adjusting the opening of a flow regulating valve of the auxiliary device according to the first temperature sensor until the temperature is constant at 50 ℃, and fixing the opening of the flow regulating valve unchanged;
s14, monitoring the indication value of the second temperature sensor in the test process, and continuing to perform the cooling liquid steam escape test of the simulated plateau environment verification expansion valve within the allowable range of the operating water temperature of the diesel engine. If the indication value of the second temperature sensor exceeds the requirement of the operating water temperature of the diesel engine, stopping the engine to check the overflow amount of the cooling water in the cooling system and appropriately supplementing the cooling water;
s15, monitoring the pressure indication value after the water pump of the diesel engine in the test process, wherein under the condition of the rated point rotating speed of the diesel engine, the deviation between the value of the pressure monitoring point after the water pump and the original design parameter can not be higher than 50kPa, otherwise, stopping the engine and resetting the starting pressure of the expansion valve.
Further, the specific method for simulating the test condition in step S2 is as follows:
s21, substituting parameters of the low idle speed of the diesel engine, the rotating speed of the heat engine under working conditions and the rotating speed of the heat engine under working conditions into the following formula for calculation;
the calculation formulas are respectively as follows:
the working condition rotating speed of the heat engine is equal to (Hidle-Lidle) × 0.25+ Lidle;
the heat engine torque is Tor @ heat engine working condition rotating speed is 0.5;
the common working condition rotating speed is (Hidle-Lidle) × 0.65+ Lidle;
the prevailing operating mode torque is Tor @ prevailing operating mode speed 0.7.
Wherein: the calculated rotating speed value 'Hidle' is expressed as a low idling speed of the diesel engine, the 'Hidle' is expressed as a high idling speed of the diesel engine, the 'Tor @ heat engine working condition rotating speed' is expressed as a maximum torque value corresponding to the heat engine working condition rotating speed, and the 'Tor @ common working condition rotating speed' is expressed as a maximum torque value corresponding to the common working condition rotating speed; rounding the rotating speed calculation result according to hundred bits and rounding the torque result according to units;
s22, the whole test process is independently repeated for three times, the indicating value of a first temperature sensor, the indicating value of a second temperature sensor, the indicating value of a third temperature sensor, the indicating value of a first pressure sensor, the indicating value of a second pressure sensor, the indicating value of an evaporation measuring device, the indicating value of a second flowmeter and the parameter collection interval is 0.01S.
Further, the processing and determination of the test data in step S3 includes the following steps:
s31, counting the flow cumulant of the evaporation measuring device recorded in the test process in the step S2, wherein the unit is L, and the cumulant is used as the matching basis of the flow area of the expansion valve; counting the maximum flow value of the evaporation measuring device recorded in the test process of the step S2, wherein the unit is L/min, and the maximum flow value is used as the basis for adjusting the starting pressure of the expansion valve;
s32, if the indication value of the first temperature sensor is higher than 50 ℃ in the test process, judging that the detection result is invalid, and supplementing a working condition of a cooling liquid steam escape test for simulating a plateau environment to verify an expansion valve;
if the indication value difference between the second temperature sensor and the third temperature sensor is higher than 3 ℃ in the test process, judging that the detection result is invalid, and supplementing a working condition of a cooling liquid steam escape test for simulating a plateau environment to verify the expansion valve;
when the indication value of the third temperature sensor is lower than that of the second temperature sensor and the difference value is higher than 3 ℃, the operation mode of the rated point is entered again, the opening degrees of the first regulating valve and the second regulating valve are further reduced, the indication value of the first flowmeter is not 0, and the maximum difference value of the second pressure sensor and the second pressure sensor is 5kPa as a control limit;
when the indication value of the third temperature sensor is higher than that of the second temperature sensor and the difference value is higher than 3 ℃, judging that the expansion water tank does not reach a saturated state, and re-entering the rated point working condition until the indication values of the third temperature sensor and the second temperature sensor are equal, supplementing the working condition of a cooling liquid steam escape test of a simulated plateau environment verification expansion valve;
if the indication value of the evaporation measuring device does not return to zero in the test process, judging that the detection result is invalid, checking the leakage condition of the cooling system, and supplementing the working condition of a cooling liquid steam escape test for simulating the plateau environment to verify the expansion valve;
if the second flowmeter has no detection flow indication value in the test process, the detection result is judged to be invalid, and the working condition of the cooling liquid steam escape test of the simulated plateau environment verification expansion valve is supplemented.
Compared with the prior art, the test method for simulating the escape of the refrigerant liquid steam of the plateau environment expansion valve has the following beneficial effects:
(1) the plateau environment simulation expansion valve cooling liquid steam escape test method solves the problem of misjudgment of cooling liquid evaporation escape and cooling system damage leakage in the actual vehicle environment, enables the cooling liquid evaporation escape condition to be reproduced in the plateau simulation of the bench, enables the designed expansion valve to be safer in starting pressure through the adjustment and optimization matching of the expansion valve, and avoids the problem of sealing element failure caused by high cooling liquid pressure in the diesel engine.
(2) The test method for simulating the plateau environment expansion valve cooling liquid steam escape is accurate in identification of the heat accumulation process of the diesel engine in the plateau simulation process, and can also be used as a thermostat matching verification test.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of a plateau environment expansion valve coolant vapor escape simulation test system according to an embodiment of the present invention;
FIG. 2 is a flow chart of a test method for simulating the escape of refrigerant vapor from the expansion valve in plateau environment according to the embodiment of the present invention;
FIG. 3 is a test condition diagram of a test method for simulating the escape of refrigerant liquid vapor from a plateau environment expansion valve according to an embodiment of the present invention.
Description of reference numerals:
1-pressure sensor number one; 2-a temperature sensor; 3-a thermostat; 4-diesel engine body; 5-a water pump rear pressure monitoring point; 6-flowmeter II; 7-temperature sensor II; 8-a water pump; 9-an engine oil heat exchanger; 10-an intercooler; 11-a high-level air release port; 12-a regulating valve; 13-second high-level air release port; 14-second regulating valve; 15-a flow meter; 16-evaporation capacity testing device; 17-manual regulating valve; 18-plateau simulated pressure; 19-an expansion valve; 20-flow regulating valve; no. 21-three temperature sensors; 22-pressure sensor number two; 23-an expansion tank; 24-cooling system heat exchanger; 25-a water filter; a-an external source main water supply pipe; b-external source main water supply pipe.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
A test system for simulating the escape of cooling liquid steam of a plateau environment expansion valve is shown in figure 1 and comprises a first pressure sensor 1, a first temperature sensor 2, a thermostat 3, a diesel engine body 4, a water pump rear pressure monitoring point 5, a second flow meter 6, a second temperature sensor 7, a water pump 8, an engine oil heat exchanger 9, an intercooler 10, a first high-level vent 11, a first regulating valve 12, a second high-level vent 13, a second regulating valve 14, a first flow meter 15, an evaporation amount testing device 16, a manual regulating valve 17, plateau simulation pressure 18, an expansion valve 19, a flow regulating valve 20, a third temperature sensor 21, a second pressure sensor 22, an expansion water tank 23, a cooling system heat exchanger 24 and a water filter 25, wherein the intercooler 10 is connected to the expansion water tank 23 through a first pipeline, the first regulating valve 12 and the first flow meter 15 are installed on the first pipeline, a water outlet end of the intercooler 10 is provided with the first high-level vent 11, the first high-level vent 11 is connected to the expansion water tank 23 sequentially through the first regulating valve 12 and the first flowmeter 15 to form a hot steam collecting passage of the intercooler 10; the intercooler 10 is connected to an inlet of a diesel engine body 44 through a second pipeline, an outlet end pipeline of the diesel engine body 44 is connected to the thermostat 3, a second high-level air release port 13 is arranged in front of the intercooler and the thermostat, the second high-level air release port 13 is connected to the first pipeline through a third pipeline, and a second regulating valve 14 is installed on the third pipeline, so that the second high-level air release port 13 is connected to the expansion water tank 23 sequentially through the second regulating valve 14 and the first flowmeter 15 to form a hot steam collecting passage of the diesel engine body 4;
the inlet end of the thermostat 3 is connected to the inlet end of a water pump 8, a first temperature sensor 2 and a first pressure sensor 1 are installed at the inlet end of the water pump 8, the outlet end of the water pump 8 is connected to the inlet of a diesel engine body 44 through an engine oil heat exchanger 9, a rear pressure monitoring point 5 of the water pump 8 is arranged on one side of the water pump 8, the outlet of the thermostat 3 is connected to an auxiliary device through a fourth pipeline, and a second temperature sensor 7 and a second flow meter 6 are installed on the fourth pipeline;
the expansion water tank 23 is connected to the plateau simulation pressure 18 through the evaporation capacity testing device 16 and the expansion valve 19 in sequence so as to approximate the actual working state of the expansion valve 19 on the plateau; the expansion valve 19 is provided with pressure setting parameters of the expansion valve 19, so that the verified result is conveniently used for adjusting the expansion valve 19 under the actual vehicle condition; the expansion water tank 23 is provided with a third temperature sensor 21 and a second pressure sensor 22, and the saturation of the cooling liquid steam of the expansion water tank 23 is detected; under the condition that the cooling system is filled with the cooling liquid, the expansion water tank 23 adds the cooling liquid level to the upper marking line or 2/3 liquid level of the whole height of the expansion water tank 23, so that the sufficient air chamber allowance of the expansion water tank 23 is ensured, and the expansion amount of the cooling liquid is ensured. The diesel engine is sequentially connected with a second temperature sensor 7, a second flowmeter 6 and an auxiliary device; the second temperature sensor 7 is used for monitoring the working safety of the diesel engine and avoiding the diesel engine from being burnt out due to overheating; the second flowmeter 6 is used for monitoring the starting process of the thermostat 3; the device comprises a first pressure sensor 1, a first temperature sensor 2, a water pump 8 rear pressure monitoring point 5, a second flow meter 6, a second temperature sensor 7, a water pump 8, a first regulating valve 12, a second high-level vent 13, a second regulating valve 14, a first flow meter 15, an evaporation capacity testing device 16, plateau simulation pressure 18, an expansion valve 19, a flow regulating valve 20, a third temperature sensor 21 and a second pressure sensor 22 which are all connected to an external controller through signals.
A first high-level vent 11 is arranged on the water outlet of the diesel engine intercooler 10 so as to introduce heat accumulation energy generated by the intercooler 10 into the expansion water tank 23; a second high-level vent 13 is arranged in front of the water discharged from the diesel engine body 44 to the thermostat 3 so as to introduce heat accumulation energy generated by the diesel engine body 4 into the expansion water tank 23;
a first temperature sensor 2 and a first pressure sensor 1 are arranged at a water inlet (inlet end of a water pump 8) of the diesel engine and are used for monitoring the cooling control precision of an auxiliary system of a test bed and ensuring the plateau operation heat accumulation boundary of the diesel engine; a pressure measuring point is arranged at the rear of the diesel engine, which is provided with a water pump 8 and is used for monitoring the safe operation of the diesel engine;
the auxiliary device comprises a cooling system heat exchanger 24, a water filter 25, a manual regulating valve 17 and a flow regulating valve 20, one end of the cooling system heat exchanger 24 is connected to the thermostat 3 through a fourth pipeline, the other end of the cooling system heat exchanger is connected to an inlet of the water pump 8, the cooling system heat exchanger 24 is connected to an external source main water supply pipe A through the water filter 25, and the manual regulating valve 17 is installed on the external source main water supply pipe A; the cooling system heat exchanger 24 is also piped to an external source main water supply pipe B, and the external source main water supply pipe B is provided with the flow regulating valve 20.
The scheme uses the vehicle state expansion water tank 23 and the vehicle state thermostat 3 to approximately and truly reproduce a cooling loop of the diesel engine in a real vehicle state; the evaporation amount measuring device 16 is a device that can perform evaporation measurement.
As shown in fig. 2 and 3, the method for simulating the plateau environment expansion valve 19 for the test of the escape of the cooling liquid steam comprises the following steps:
s1, testing a cooling boundary, and debugging;
s2, simulating test conditions after debugging in the step S1;
and S3, processing and judging the data in the step S2.
The specific method of S1 is as follows:
starting a diesel engine, entering a heat engine working condition, adjusting the altitude environment of the plateau simulation system to a target verification environment when the temperature of lubricating oil reaches a condition (each diesel engine manufacturer is self-defined) allowing performance test to be carried out, operating the diesel engine in a rated point rotating speed working condition, and starting test cooling boundary debugging;
the opening degrees of the first regulating valve 12 and the second regulating valve 14 are gradually reduced by the controller until the difference value obtained by subtracting the indication value of the first pressure sensor 1 from the indication value of the second pressure sensor 22 is 0, and the numerical value of the first flowmeter 15 is not 0;
adjusting the opening degree of a flow adjusting valve 20 of the auxiliary device according to the first temperature sensor 2 until the temperature is constant at 50 ℃, and fixing the opening degree of the flow adjusting valve 20;
in the test process, the indication value of the second temperature sensor 7 is monitored, and the cooling liquid steam escape test of the plateau environment simulation verification expansion valve 19 can be continuously carried out within the allowable range of the operating water temperature of the diesel engine. If the value indicated by the second temperature sensor 7 exceeds the requirement of the water temperature for the operation of the diesel engine, stopping the engine to check the overflow amount of the cooling water in the cooling system and appropriately supplementing the cooling water;
monitoring the rear pressure indication value of a water pump 8 of the diesel engine in the test process, wherein under the working condition of the rated point rotating speed of the diesel engine, the deviation between the value of a rear pressure monitoring point 5 of the water pump 8 and the original design parameter cannot be higher than 50kPa, otherwise, stopping the engine and resetting the starting pressure of an expansion valve 19;
the specific method of S2 is as follows: the working conditions of a refrigerant vapor escape test for verifying the expansion valve 19 by simulating the plateau environment are shown in fig. 3 and are performed according to the following table 1,
TABLE 1 test conditions for evaporation characteristics of cooling systems
The parameter calculation method comprises the following steps:
the working condition rotating speed of the heat engine is equal to (Hidle-Lidle) × 0.25+ Lidle;
the heat engine torque is Tor @ heat engine working condition rotating speed is 0.5;
the common working condition rotating speed is (Hidle-Lidle) × 0.65+ Lidle;
the prevailing operating mode torque is Tor @ prevailing operating mode speed 0.7.
Wherein: the calculated rotating speed value 'Hidle' is expressed as a low idling speed of the diesel engine, the 'Hidle' is expressed as a high idling speed of the diesel engine, the 'Tor @ heat engine working condition rotating speed' is expressed as a maximum torque value corresponding to the heat engine working condition rotating speed, and the 'Tor @ common working condition rotating speed' is expressed as a maximum torque value corresponding to the common working condition rotating speed. The result of the rotation speed calculation is rounded by hundred bits, and the result of the torque is rounded by one bit.
The whole test process is independently repeated for three times, the indicating value of the first temperature sensor 2, the indicating value of the second temperature sensor 7, the indicating value of the third temperature sensor 21, the indicating value of the first pressure sensor 1, the indicating value of the second pressure sensor 22, the flow indicating value of the evaporation measuring device and the indicating value of the second flowmeter 6 are collected and recorded in the test, and the parameter collection interval is 0.01 s.
The test data processing and determination in step S3 includes the following:
counting the accumulated flow of the evaporation measuring device recorded in the test process in the step S2, wherein the unit is L and the accumulated flow is used as a matching basis of the flow area of the expansion valve 19;
counting the maximum flow value of the evaporation measuring device recorded in the test process of the step S2, wherein the unit is L/min, and the maximum flow value is used as the basis for adjusting the starting pressure of the expansion valve 19;
if the indication value of the first temperature sensor 2 is higher than 50 ℃ in the test process, the detection result is judged to be invalid, and the working condition of a cooling liquid steam escape test of the simulated plateau environment verification expansion valve 19 is supplemented;
if the difference between the indication values of the second temperature sensor 7 and the third temperature sensor 21 is higher than 3 ℃ in the test process, the detection result is judged to be invalid, and the working condition of a cooling liquid steam escape test of the simulated plateau environment verification expansion valve 19 is supplemented;
when the indication value of the third temperature sensor 21 is lower than the indication value of the second temperature sensor 7 and the difference value is higher than 3 ℃, the operation mode of the rated point is entered again, the opening degrees of the first regulating valve 12 and the second regulating valve 14 are further reduced, the indication value of the first flowmeter 15 is not 0, and the maximum difference value of 5kPa between the second pressure sensor 22 and the second pressure sensor 22 is taken as a control limit;
when the indication value of the third temperature sensor 21 is higher than the indication value of the second temperature sensor 7 and the difference value is higher than 3 ℃, judging that the expansion water tank 23 does not reach a saturated state, and re-entering the rated point working condition until the indication values of the third temperature sensor 21 and the second temperature sensor 7 are equal, supplementing the working condition of a cooling liquid steam escape test of the simulated plateau environment verification expansion valve 19;
if the indication value of the evaporation measuring device does not return to zero in the test process, judging that the detection result is invalid, checking the leakage condition of the cooling system, and supplementing the working condition of a cooling liquid steam escape test for simulating the plateau environment to verify the expansion valve 19;
if the second flowmeter 6 has no detection flow indication value in the test process, the detection result is judged to be invalid, and the working condition of the cooling liquid steam escape test of the simulated plateau environment verification expansion valve 19 is supplemented.
The application provides a reliable and practical cooling liquid steam escape test method for verifying the expansion valve 19 in the simulated plateau environment, which solves the problem of misjudgment of cooling liquid evaporation escape and cooling system damage leakage in the real vehicle environment, so that the cooling liquid evaporation escape condition is reproduced in the bench plateau simulation, and the designed expansion valve 19 is safer in starting pressure through the setting and optimized matching of the expansion valve 19, and the problem of sealing element failure caused by higher cooling liquid pressure in the diesel engine can not be introduced; the method has accurate identification on the heat accumulation process of the diesel engine in the plateau simulation process, and can also be used as a matching verification test of the thermostat 3.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. Simulation plateau environment expansion valve coolant liquid steam escape test system, including intercooler and controller, its characterized in that: the controller is respectively in signal connection with a first pressure sensor, a first temperature sensor, a water pump rear pressure monitoring point, a second flow meter, a second temperature sensor, a first regulating valve, a second regulating valve, a first flow meter, an evaporation capacity testing device, a flow regulating valve, a third temperature sensor and a second pressure sensor, the intercooler is connected to the expansion water tank through a first pipeline, the first regulating valve and the first flow meter are installed on the first pipeline, a high-position air release port is arranged at the water outlet end of the intercooler, and the first high-position air release port is connected to the expansion water tank through the first regulating valve and the first flow meter in sequence to form an intercooler hot steam collecting passage; the intercooler is connected to an inlet of the diesel engine body 4 through a second pipeline, an outlet end pipeline of the diesel engine body 4 is connected to the thermostat, a second high-level air release port is arranged in front of the intercooler and the thermostat, the second high-level air release port is connected to the first pipeline through a third pipeline, and a second regulating valve is installed on the third pipeline, so that the second high-level air release port is connected to the expansion water tank through the second regulating valve and the first flow meter in sequence to form a hot steam collecting channel of the diesel engine body; the inlet end of the thermostat is connected to the inlet end of a water pump, the inlet end of the water pump is provided with a first temperature sensor and a first pressure sensor, the outlet end of the water pump is connected to the inlet of a diesel engine body 4 through an engine oil heat exchanger, the outlet of the thermostat is connected to an auxiliary device through a fourth pipeline, and a second temperature sensor and a second flowmeter are arranged on the fourth pipeline; the auxiliary device is used for assisting the system to normally operate; the expansion tank is connected to plateau analog pressure through the evaporation capacity testing device and the expansion valve in sequence, and the expansion tank is provided with a third temperature sensor and a second pressure sensor.
2. The simulated plateau environment expansion valve coolant vapor escape test system of claim 1, wherein: one side of the water pump is provided with a water pump rear pressure monitoring point for monitoring the safe operation of the diesel engine.
3. The simulated plateau environment expansion valve coolant vapor escape test system of claim 1, wherein: the auxiliary device comprises a cooling system heat exchanger, a water filter, a manual regulating valve and a flow regulating valve, one end of the cooling system heat exchanger is connected to the thermostat through a fourth pipeline, the other end of the cooling system heat exchanger is connected to an inlet of the water pump, the cooling system heat exchanger is connected to an external source main water supply pipe through the water filter, and the manual regulating valve is installed on the external source main water supply pipe; the cooling system heat exchanger is also connected to an external source total water return pipe through a pipeline, and a flow regulating valve is installed on the external source total water return pipe.
4. The test method for simulating the plateau environment expansion valve cooling liquid steam escape test system according to any one of claims 1 to 3 is characterized in that: the method comprises the following steps:
s1, testing a cooling boundary, and debugging;
s2, simulating test conditions after debugging in the step S1;
and S3, processing and judging the data in the step S2.
5. The test method for simulating the escape of the refrigerant liquid steam of the plateau environment expansion valve as claimed in claim 4, wherein: the debugging method for testing the cooling boundary in the step S1 is as follows:
s11, starting the diesel engine, entering a heat engine working condition, adjusting the altitude environment of the plateau simulation system to a target verification environment when the temperature of the lubricating oil reaches a performance test condition allowed to be developed, operating the diesel engine on a rated point rotating speed working condition, and starting test cooling boundary debugging;
s12, gradually reducing the opening degrees of the first regulating valve and the second regulating valve through the controller until the difference value obtained by subtracting the indication value of the first pressure sensor from the indication value of the second pressure sensor is 0, and simultaneously the numerical value of the first flowmeter is not 0;
s13, adjusting the opening of a flow regulating valve of the auxiliary device according to the first temperature sensor until the temperature is constant at 50 ℃, and fixing the opening of the flow regulating valve unchanged;
s14, monitoring the indication value of the second temperature sensor in the test process, and continuing to perform a cooling liquid steam escape test of the plateau environment simulation verification expansion valve within the allowable range of the operating water temperature of the diesel engine; if the indication value of the second temperature sensor exceeds the requirement of the operating water temperature of the diesel engine, stopping the engine to check the overflow amount of the cooling water in the cooling system and appropriately supplementing the cooling water;
s15, monitoring the pressure indication value after the water pump of the diesel engine in the test process, wherein under the condition of the rated point rotating speed of the diesel engine, the deviation between the value of the pressure monitoring point after the water pump and the original design parameter can not be higher than 50kPa, otherwise, stopping the engine and resetting the starting pressure of the expansion valve.
6. The test method for simulating the escape of the refrigerant liquid steam of the plateau environment expansion valve as claimed in claim 4, wherein: the specific method for simulating the test condition in the step S2 is as follows:
s21, substituting parameters of the low idle speed of the diesel engine, the rotating speed of the heat engine under working conditions and the rotating speed of the heat engine under working conditions into the following formula for calculation;
the calculation formulas are respectively as follows:
the working condition rotating speed of the heat engine is equal to (Hidle-Lidle) × 0.25+ Lidle;
the heat engine torque is Tor @ heat engine working condition rotating speed is 0.5;
the common working condition rotating speed is (Hidle-Lidle) × 0.65+ Lidle;
the common operating condition torque is Tor @ common operating condition rotating speed is 0.7;
wherein: the calculated rotating speed value 'Hidle' is expressed as a low idling speed of the diesel engine, the 'Hidle' is expressed as a high idling speed of the diesel engine, the 'Tor @ heat engine working condition rotating speed' is expressed as a maximum torque value corresponding to the heat engine working condition rotating speed, and the 'Tor @ common working condition rotating speed' is expressed as a maximum torque value corresponding to the common working condition rotating speed; rounding the rotating speed calculation result according to hundred bits and rounding the torque result according to units;
s22, the whole test process is independently repeated for three times, the indicating value of a first temperature sensor, the indicating value of a second temperature sensor, the indicating value of a third temperature sensor, the indicating value of a first pressure sensor, the indicating value of a second pressure sensor, the indicating value of an evaporation measuring device, the indicating value of a second flowmeter and the parameter collection interval is 0.01S.
7. The test method for simulating the escape of the refrigerant liquid steam of the plateau environment expansion valve as claimed in claim 4, wherein: the test data processing and determination in step S3 includes the following:
s31, counting the flow cumulant of the evaporation measuring device recorded in the test process in the step S2, wherein the unit is L, and the cumulant is used as the matching basis of the flow area of the expansion valve; counting the maximum flow value of the evaporation measuring device recorded in the test process of the step S2, wherein the unit is L/min, and the maximum flow value is used as the basis for adjusting the starting pressure of the expansion valve;
s32, if the indication value of the first temperature sensor is higher than 50 ℃ in the test process, judging that the detection result is invalid, and supplementing a working condition of a cooling liquid steam escape test for simulating a plateau environment to verify an expansion valve;
if the indication value difference between the second temperature sensor and the third temperature sensor is higher than 3 ℃ in the test process, judging that the detection result is invalid, and supplementing a working condition of a cooling liquid steam escape test for simulating a plateau environment to verify the expansion valve;
when the indication value of the third temperature sensor is lower than that of the second temperature sensor and the difference value is higher than 3 ℃, the operation mode of the rated point is entered again, the opening degrees of the first regulating valve and the second regulating valve are further reduced, the indication value of the first flowmeter is not 0, and the maximum difference value of the second pressure sensor and the second pressure sensor is 5kPa as a control limit;
when the indication value of the third temperature sensor is higher than that of the second temperature sensor and the difference value is higher than 3 ℃, judging that the expansion water tank does not reach a saturated state, and re-entering the rated point working condition until the indication values of the third temperature sensor and the second temperature sensor are equal, supplementing the working condition of a cooling liquid steam escape test of a simulated plateau environment verification expansion valve;
if the indication value of the evaporation measuring device does not return to zero in the test process, judging that the detection result is invalid, checking the leakage condition of the cooling system, and supplementing the working condition of a cooling liquid steam escape test for simulating the plateau environment to verify the expansion valve;
if the second flowmeter has no detection flow indication value in the test process, the detection result is judged to be invalid, and the working condition of the cooling liquid steam escape test of the simulated plateau environment verification expansion valve is supplemented.
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