CN113253778B - Engine bench test temperature boundary control system, method and storage medium - Google Patents
Engine bench test temperature boundary control system, method and storage medium Download PDFInfo
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Abstract
The invention discloses a system and a method for controlling the temperature boundary of an engine bench test and a storage medium. The method comprises the following steps: establishing a rack temperature control equipment heat exchange model and an engine heat exchange demand prediction model; the engine heat exchange demand prediction model calculates the demand heat exchange quantity of the current working condition in real time according to the working condition of the engine, wherein the demand heat exchange quantity comprises the intercooling demand heat exchange quantity; the heat exchange model of the rack temperature control equipment calculates the heating amount and/or the cooling amount of the intercooled temperature controller according to the intercooled heat exchange amount required; calculating the heater power of the temperature controller after intercooling according to the heating amount, and calculating the heat exchange coefficient of a heat exchanger in the temperature controller after intercooling and variable control parameters influencing the heat exchange coefficient h according to the cooling amount, wherein the variable control parameters comprise the flow of a circulating pump and the opening of a three-way proportional valve; and controlling the after-intercooling temperature controller according to the control parameters calculated in the previous step so as to control the temperature boundary of the engine. The invention can lead the rack temperature control equipment to synchronously adjust the heat exchange quantity along with the working condition change of the engine.
Description
Technical Field
The invention relates to the technical field of engine bench tests, in particular to a system and a method for controlling temperature boundary of an engine bench test and a storage medium.
Background
The engine temperature boundary needs to be adjusted according to the engine working condition in the engine bench test process. It is also desirable to maintain the temperature boundary stable during data measurement in engine bench testing. These temperature boundaries are typically temperature swing controlled according to national standards or design goals. The current temperature control equipment generally adopts PID control, and the cooling capacity or the heating capacity of the temperature control equipment is increased mainly by detecting the difference value of an actual temperature boundary and a target temperature boundary. The control mode has the defects of long adjustment time, large overshoot, high equipment energy consumption and the like. The engine needs a long time after being adjusted to a target working condition, and test data can be measured and recorded after the temperature boundary is adjusted stably, so that the efficiency of engine test is reduced.
Accordingly, it is desirable to provide an engine bench test temperature boundary control system, method and storage medium to solve the above problems.
Disclosure of Invention
The invention aims to provide an engine bench test temperature boundary control method, a vehicle and a storage medium, which can enable a temperature control device to synchronously adjust the heat exchange quantity along with the change of the working condition of an engine when the working condition of the engine changes, thereby reducing the system delay, overshoot and energy consumption, further improving the test efficiency and saving energy.
In order to realize the purpose, the following technical scheme is provided:
an engine bench test temperature boundary control system comprising:
the bench automatic control system is used for automatically controlling the engine bench test;
the accelerator pedal is connected with the rack automatic control system so as to control the opening degree of the accelerator pedal through the rack automatic control system;
the engine assembly is connected with the accelerator pedal and can adjust the load of the engine according to the signal of the accelerator pedal;
the dynamometer is connected with the engine assembly and the rack automatic control system;
the heat exchange quantity calculation module is used for calculating the required heat exchange quantity of the engine under the current working condition;
the rack temperature control equipment is connected with the engine assembly and the heat exchange amount calculation module and used for adjusting the temperature boundary of the engine and comprises an air inlet temperature and humidity controller, an intercooling temperature controller, a cooling water temperature controller, an engine oil temperature controller and an exhaust temperature cooler;
wherein the post-intercooling temperature controller comprises:
the system comprises a water storage tank, a circulating pump, a chilled water heat exchanger, a heater, a three-way proportional valve and an intercooler spray tank; the water inlet of the circulating pump is connected with the water storage tank, the cooling water from the water outlet of the circulating pump is divided into two paths, one path of cooling water flows to one inlet of the three-way proportional valve after passing through the heater, the other path of cooling water flows to the other inlet of the three-way proportional valve after passing through the chilled water heat exchanger, and the two paths of cooling water flow back to the water storage tank after converging and flowing through the intercooler spray tank after passing through the three-way proportional valve; the inlet air of the engine passes through the intercooler spray tank to exchange heat with the cooling water; the chilled water flows through the chilled water heat exchanger to exchange heat with the cooling water.
An engine bench test temperature boundary control method based on the engine bench test temperature boundary control system comprises the following steps:
s100, establishing a rack temperature control equipment heat exchange model and an engine heat exchange demand prediction model in a heat exchange quantity calculation module;
s200, calculating the required heat exchange quantity of the current working condition in real time according to the working condition of the engine by using an engine heat exchange demand prediction model, wherein the required heat exchange quantity comprises an inter-cooling required heat exchange quantity Qicd；
S300, enabling a heat exchange model of the rack temperature control equipment to exchange heat quantity Q according to intercooling requirementsicdCalculating the heating quantity Q of the intercooled temperature controllerheatAnd cooling capacity Qcool；
S400, according to the heating quantity QheatCalculating the heater power P of the intercooled temperature controller according to the cooling quantity QcoolCalculating the heat exchange coefficient h of a heat exchanger in the intercooled temperature controller and variable control parameters influencing the heat exchange coefficient h, wherein the variable control parameters comprise the flow q of the circulating pumpmAnd opening degree P of three-way proportional valvev；
S500, the rack automation control system controls the intercooled temperature controller according to the control parameters calculated in the steps S200 to S400 so as to control the temperature boundary of the engine.
As an alternative to the above-mentioned engine bench test temperature boundary control method, the following heat formula is provided in the after-cold temperature controller:
Qic＝Qheat+Qcool+Qother(A)
Wherein Q isicFor heat exchange capacity of heat exchangers between cooling water and engine intake air, QheatAmount of cooling water heated by heater, QcoolThe heat exchange amount of the chilled water heat exchanger to cooling water, QotherWhich is the heat dissipation loss of the pipeline.
As an alternative to the above-mentioned engine bench test temperature boundary control method, the heat exchange amount per unit time of the heat exchanger in the after-intercooling temperature controller is calculated by the following formula:
Qj＝hAj(Thigh-Tlow) (II)
Wherein h is a heat exchange coefficient; a is the heat exchange area; the medium temperatures at both sides of the heat exchanger are respectively ThighAnd Tlow。
As an alternative to the above-described engine bench test temperature boundary control method, the heat transfer coefficient h and the circulation pump flow qmOpening P of proportional valve of sum teevThe functional relationship between the two is as follows:
h＝f(qm,Pv) (III)
As an alternative to the above-described engine bench test temperature boundary control method, the heating amount per unit time of the heater is expressed by:
Qh eateta (four)
Where P is the heater power and η is the heater efficiency.
As an alternative to the above-described engine bench test temperature boundary control method, the heat exchange model of the bench temperature control device is established according to equations (one) to (four).
As an alternative of the temperature boundary control method for the engine bench test, the engine heat exchange demand prediction model is established through a mathematical model, a physical simulation model or a combination of mathematical and physical models.
As an alternative to the above method for controlling the temperature boundary of the engine bench test, the physical simulation model is established in the following manner:
the compressor can increase the temperature of the inlet air while compressing the inlet air of the engine, and the temperature of the inlet air can satisfy the following relation:
wherein, TcIs the compressor outlet temperature, ηcFor compressor efficiency, TciFor the inlet temperature, pi, of the compressorcThe pressure ratio is gamma, the isentropic index is gamma, the efficiency eta c of the air compressor is obtained from an air compressor MAP file, and the pressure ratio picObtaining real-time working condition parameters of the engine; by compressor outlet temperature TcCalculating the heat exchange requirement of the intercooled temperature controller by combining the following formula:
Qicd＝q.cp.(Tici-Tico) (VI)
Wherein QicdQ is the engine intake air flow, cpSpecific heat capacity at constant pressure, TiciIs the pre-intercooling temperature, TicoIs the target after-cold intake air temperature.
A computer-readable storage medium, having stored thereon a computer program which, when executed by a processor, implements the engine rig test temperature boundary control method as described above.
Compared with the prior art, the invention has the beneficial effects that: the heat exchange quantity calculation module can calculate the required heat exchange quantity of each temperature control device (such as an after-intercooling temperature controller) of the engine under different working conditions in real time, and when the working condition of the engine changes, the heat exchange quantity calculation module transmits control information to each temperature control device through the rack automatic control system, so that the temperature control devices synchronously adjust the heat exchange quantity along with the working condition change of the engine, thereby obviously reducing the system delay and overshoot and energy consumption, further improving the test efficiency and saving energy.
Drawings
FIG. 1 is a schematic structural diagram of a first embodiment of an engine bench test temperature boundary control system of the present invention;
FIG. 2 is a schematic structural diagram of a second embodiment of an engine bench test temperature boundary control system of the present invention;
FIG. 3 is a schematic structural diagram of an embodiment of the post-intercooling temperature controller of the present invention;
FIG. 4 is a block flow diagram of a first embodiment of an engine bench test temperature boundary control method of the present invention;
FIG. 5 is a block flow diagram of a second embodiment of an engine bench test temperature boundary control method of the present invention.
Reference numerals:
1. a heat exchange amount calculation module; 2. a rack automation control system; 3. an accelerator pedal; 4. an engine assembly; 5. a rack temperature control device; 6. a stage measurement device; 7. a dynamometer; 8. an engine ECU calibration system; 9. an automatic calibration device;
10. the system comprises a water storage tank, 20, a circulating pump, 30, a chilled water heat exchanger, 40, a heater, 50, a three-way proportional valve, 60, an intercooler spray tank, 70, a water supply and return pipeline, 80 and a control communication module.
Detailed Description
The following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
The invention provides an engine bench test temperature boundary control system, fig. 1 is a schematic structural diagram of a first embodiment of the engine bench test temperature boundary control system in the invention, as shown in fig. 1, the engine bench test temperature boundary control system comprises:
the bench automatic control system 2 is used for automatic control of the engine bench test;
the accelerator pedal 3 is connected with the rack automatic control system 2, so that the opening degree of the accelerator pedal 3 is controlled through the rack automatic control system 2;
the engine assembly 4 is connected with the accelerator pedal 3 and can adjust the engine load according to the signal of the accelerator pedal 3;
the dynamometer 7 is connected with the engine assembly 4 and the rack automatic control system 2;
the heat exchange quantity calculating module 1 is used for calculating the required heat exchange quantity of the engine under the current working condition;
and the rack temperature control equipment 5 is connected with the engine assembly 4 and the heat exchange amount calculation module 1 and is used for adjusting the temperature boundary of the engine and comprises an air inlet temperature and humidity controller, an intercooling temperature controller, a cooling water temperature controller, an engine oil temperature controller and an exhaust temperature cooler.
The rack automation control system 2 controls the operation of the accelerator pedal 3, the rack temperature control device 5 and the dynamometer 7 through Ethernet, a CAN bus, an IO port and the like, and obtains the measurement data of the rack measurement device 6. The engine assembly 4 comprises an engine and an electronic control system thereof, and the engine assembly 4 can adjust the engine load according to the signal of the accelerator pedal 3. As shown in fig. 1, in the first embodiment of the temperature boundary control system for the engine bench test of the present invention, the heat exchange amount calculation module 1 is integrated in the bench automation control system 2, as shown in fig. 2, in the second embodiment of the temperature boundary control system for the engine bench test of the present invention, the heat exchange amount calculation module 1 is integrated in the automatic calibration device 9. Optionally, the engine ECU calibration system 8 and the automatic calibration device 9 are connected to the gantry automation system via an ethernet or CAN bus, and transmit measurement data and control commands via an ASAP3 protocol or a CAN bus protocol. Meanwhile, the engine ECU calibration system 8 is also connected with the ECU through a CAN bus or an ETK line and is used for sending a control command to the ECU and receiving data measured by the ECU.
As described above, the rack temperature control devices 5 may include an intake air temperature and humidity controller, an after-cold temperature controller, a cooling water temperature controller, an engine oil temperature controller, and an exhaust temperature cooler, and the plurality of rack temperature control devices 5 together control the temperature boundary of the engine rack test. The invention takes an intercooled temperature controller as an example to explain the temperature boundary control of the engine bench test.
Fig. 3 is a schematic structural diagram of an embodiment of the post-intercooling temperature controller in the present invention, and as shown in fig. 3, the post-intercooling temperature controller includes a water storage tank 10, a circulation pump 20, a chilled water heat exchanger 30, a heater 40, a three-way proportional valve 50, and an intercooler spray tank 60. The water inlet of the circulating pump 20 is connected with the water storage tank 10, the cooling water from the water outlet of the circulating pump 20 is divided into two paths, wherein one path of cooling water flows to one inlet of the three-way proportional valve 50 after passing through the heater 40, the other path of cooling water flows to the other inlet of the three-way proportional valve 50 after passing through the chilled water heat exchanger 30, and the two paths of cooling water flow back to the water storage tank 10 after converging and flowing through the intercooler spray tank 60 after coming out of the three-way proportional valve 50; the cooling water in the intercooler spray tank 60 flows back to the water storage tank 10 through the water supply and return line 70. The after-intercooling temperature controller further comprises a control communication module 80, wherein the control communication module 80 is connected with the circulating pump 20 and the three-way proportional valve 50 so as to control the circulating pump 20 and the three-way proportional valve 50. The inlet air of the engine passes through the intercooler spray tank 60 to exchange heat with cooling water; the chilled water passes through the chilled water heat exchanger 30 to exchange heat with the cooling water. Flow q of circulating pump 20 in temperature controller after intercoolingmAnd opening degree P of three-way proportional valve 50vThe temperature and the flow of the cooling water can be controlled by adjusting, so that the heat exchange quantity between the cooling water and the air inlet of the engine is controlled, and the control of the temperature boundary of the engine bench test is realized.
Example two
The second embodiment of the present invention further provides a method for controlling the temperature boundary of the engine bench test, and referring to fig. 4, the method for controlling the temperature boundary of the engine bench test includes the following steps:
s1, establishing a heat exchange model of the rack temperature control equipment;
s2, an engine heat exchange demand prediction model;
s3, judging whether the working condition of the engine changes or not;
s4, if the working condition of the engine changes, calling an engine heat exchange demand prediction model to calculate the demanded heat exchange quantity, calling a rack temperature control equipment heat exchange model to calculate variable control parameters (such as the opening degree of a valve body in the temperature control equipment, the opening degree of a water pump and the like) of the temperature control equipment, and adjusting and controlling the temperature control equipment according to the variable control parameters;
and S5, judging whether the steady-state error exists between the test temperature boundary of the engine pedestal and the target value, and if so, applying PID (proportion integration differentiation) regulation to correct the error.
The invention can calculate the required heat exchange quantity of each temperature control device and the variable control parameter of the temperature control device under different working conditions in real time, and after the variable control parameter of the temperature control device is calculated, the heat exchange quantity calculation module sends the control parameter to each temperature control device through the rack automatic control system, so that each temperature control device adjusts the heating quantity, the heat dissipation quantity and the like when the working condition of the engine changes, the temperature boundary of the engine is stabilized as soon as possible, and the overshoot and energy consumption of the device are reduced. If the adjustment has steady-state error, small correction is carried out through PID adjustment. The invention can lead the temperature control equipment to synchronously adjust the heat exchange quantity along with the working condition change of the engine, thereby obviously reducing the system delay, overshoot and energy consumption, further improving the test efficiency and saving energy.
In another embodiment, as shown in fig. 5, when the engine performs automatic test and data measurement according to the test working condition plan, the heat exchange amount calculation module may start to adjust the heat exchange amount of the temperature control device according to the next target working condition after the previous working condition data measurement is finished, and ignore the heat exchange demand response of the transition working condition, thereby further reducing the temperature boundary stabilization time and improving the test efficiency.
In another embodiment, the rack temperature control device is described in detail by taking an intercooled temperature controller as an example, and in another embodiment, with reference to fig. 3, the engine bench test temperature boundary control method includes the following steps:
s10, establishing a rack temperature control equipment heat exchange model and an engine heat exchange demand prediction model in the heat exchange quantity calculation module;
s20, calculating the required heat exchange quantity of the current working condition in real time according to the working condition of the engine by the engine heat exchange demand prediction model, wherein the required heat exchange quantity comprises the intercooling required heat exchange quantity Qicd；
S30, heat exchange quantity Q of heat exchange model of rack temperature control equipment according to intercooling requirementicdCalculating the heating quantity Q of the intercooled temperature controllerheatAnd cooling capacity Qcool；
S40, according to the heating quantity QheatCalculating the heater power P of the intercooled temperature controller according to the cooling quantity QcoolCalculating the heat exchange coefficient h of a heat exchanger in the intercooled temperature controller and variable control parameters influencing the heat exchange coefficient h, wherein the variable control parameters comprise the flow q of the circulating pumpmAnd opening degree P of three-way proportional valvev；
And S50, controlling the after-cold temperature controller by the rack automation control system according to the control parameters calculated in the steps S20 to S40 so as to control the temperature boundary of the engine.
Specifically, the heat exchanger and the heater are arranged in the inter-cooling temperature controller, so that the heat exchange model of the rack temperature control device comprises a heat exchanger model and a heater model, the heat exchanger model is used for calculating the heat exchange quantity and parameters of the heat exchanger, and the heater model is used for calculating the heating quantity and parameters of the heater.
The intercooled temperature controller has the following heat formula:
Qic＝Qheat+Qcool+Qother(A)
Wherein Q isicFor the heat exchange amount of the heat exchanger between the cooling water and the engine intake air, refer to fig. 3, QicAlso understood as the amount of heat exchange, Q, of the intercooler spray tank 60heatAmount of heating of cooling water, Q, for the heater 40coolThe heat exchange amount, Q, of the chilled water heat exchanger 30 to the cooling waterotherWhich is the heat dissipation loss of the pipeline.
The heat exchange amount of the heat exchanger in the intercooled temperature controller in unit time is calculated by the following formula:
Qj＝hAj(Thigh-Tlow) (II)
Wherein h is a heat exchange coefficient; a is the heat exchange area; the medium temperatures at both sides of the heat exchanger are respectively ThighAnd Tlow. Heat exchange coefficient h, heat exchange area A and medium temperature T at two sides of heat exchangerhighAnd TlowAll parameters need to be input when the calculation is carried out through the model. Referring to FIG. 3, here QjThe device can express the heat exchange quantity of the frozen water heat exchanger in the post-intercooling temperature controller in unit time, and also can express the heat exchange quantity of the intercooler spray box in the post-intercooling temperature controller in unit time, and the frozen water heat exchanger and the intercooler spray box are both heat exchangers. For the intercooling rear temperature controller in the embodiment, the heat exchange area A of each heat exchanger is a fixed value, the temperature of the low-temperature side of the chilled water heat exchanger does not change along with the working condition of the engine, the main influence factor of the heat exchange coefficient h of each heat exchanger is the flow of cooling water flowing through each heat exchanger controlled by the opening degree of the circulating pump and the three-way proportional valve, and the heat exchange coefficient h and the flow q of the water pump can be obtained by calibrationmAnd proportional valve opening degree PvFunctional relationship between them.
Heat transfer coefficient h and circulation pump flow qmOpening P of proportional valve of sum teevThe functional relationship between the two is as follows:
h＝f(qm,Pv) (III)
The heating amount per unit time of the heater can be calculated by the following formula:
Qh eateta (four)
Where P is the heater power and η is the heater efficiency.
According to the invention, the heat exchange model of the rack temperature control equipment can be programmed by using languages such as Python and the like, and parameters such as heat exchange coefficients h and the like which are difficult to measure are calibrated by combining test data.
Meanwhile, an engine heat exchange demand prediction model is required to be established. The cooling water, engine oil, intake air and exhaust of the engine exchange heat with the outside. The engine heat exchange demand prediction model is established through a mathematical model, a physical simulation model or a combination model of mathematics and physics. The mathematical model is based on existing test data, can be predicted in a table look-up mode, and can also be calculated by fitting the data into a function and then substituting working condition parameters. The physical simulation model is a model established based on a physical principle, a modeling idea is illustrated by taking prediction of heat exchange demand of a charge air cooler of the supercharged engine as an example, and the establishment mode of the physical simulation model is as follows:
the compressor can increase the temperature of the inlet air while compressing the inlet air of the engine, and the temperature of the inlet air can satisfy the following relation:
wherein, TcIs the compressor outlet temperature, ηcFor compressor efficiency, TciFor the inlet temperature, pi, of the compressorcThe pressure ratio is gamma, the isentropic index is gamma, the efficiency eta c of the air compressor is obtained from an air compressor MAP file, and the pressure ratio picObtaining real-time working condition parameters of the engine; by compressor outlet temperature TcCalculating the heat exchange requirement of the intercooled temperature controller by combining the following formula:
Qicd＝q.cp.(Tici-Tico) (VI)
Wherein QicdQ is the engine intake air flow, cpSpecific heat capacity at constant pressure, TiciTo a pre-intercooling temperature (approximately equal to the compressor outlet temperature T)c)，TicoIs the target after-cold intake air temperature.
The engine heat exchange demand prediction model can be programmed by using Python and other languages, and parameters which are difficult to measure are calibrated by combining test data.
When the working condition of the engine changes, the heat exchange quantity calculation module calculates the required heat exchange quantity of the current working condition in real time according to the engine heat exchange demand prediction model, such as the intercooling required heat exchange quantity Qicd. Further, calculating the temperature control equipment response according to the required heat exchange quantity and the heat exchange model of the rack temperature control equipmentThe supplied heating amount QheatOr cooling capacity Qcool. Further, the heater power P is calculated according to the required heating amount and the heater model. Calculating a desired heat transfer coefficient h and a variable control parameter affecting the heat transfer coefficient, such as a circulating pump flow q of the post-intercooling temperature controller, based on the desired cooling capacity and the heat exchanger modelmAnd three-way proportional valve opening degree Pv
EXAMPLE III
The third embodiment of the invention also provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to realize the engine bench test temperature boundary control method.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which may be stored in a computer-readable storage medium, such as a floppy disk, a Read-only memory (ROM), a Random Access Memory (RAM), a FLASH memory (FLASH), a hard disk or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute the methods according to the embodiments of the present invention.
In the above embodiment, each included unit and module is only divided according to functional logic, but is not limited to the above division as long as the corresponding function can be realized; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (7)
1. An engine bench test temperature boundary control system, comprising:
the bench automatic control system (2) is used for automatically controlling the engine bench test;
the accelerator pedal (3) is connected with the rack automatic control system (2) so as to control the opening degree of the accelerator pedal (3) through the rack automatic control system (2);
the engine component (4) is connected with the accelerator pedal (3) and can adjust the engine load according to the signal of the accelerator pedal (3);
the dynamometer (7) is connected with the engine assembly (4) and the rack automatic control system (2);
the heat exchange quantity calculating module (1) is used for calculating the required heat exchange quantity of the engine under the current working condition;
the rack temperature control equipment (5) is connected with the engine assembly (4) and the heat exchange amount calculation module (1) and is used for adjusting the temperature boundary of the engine and comprises an air inlet temperature and humidity controller, an intercooling temperature controller, a cooling water temperature controller, an engine oil temperature controller and an exhaust temperature cooler;
wherein the post-intercooling temperature controller comprises:
a water storage tank (10), a circulating pump (20), a chilled water heat exchanger (30), a heater (40), a three-way proportional valve (50) and an intercooler spray tank (60); the water inlet of the circulating pump (20) is connected with the water storage tank (10), the cooling water from the water outlet of the circulating pump (20) is divided into two paths, one path of cooling water flows to one inlet of the three-way proportional valve (50) after passing through the heater (40), the other path of cooling water flows to the other inlet of the three-way proportional valve (50) after passing through the chilled water heat exchanger (30), and the two paths of cooling water flow back to the water storage tank (10) after converging and flowing through the intercooler spray tank (60) after coming out of the three-way proportional valve (50); the inlet air of the engine passes through the intercooler spray box (60) to exchange heat with cooling water; the chilled water flows through the chilled water heat exchanger (30) to exchange heat with cooling water;
the heat exchange amount calculation module (1) carries out an engine bench test temperature boundary control method through the following steps:
s100, establishing a rack temperature control equipment heat exchange model and an engine heat exchange demand prediction model in a heat exchange quantity calculation module:
wherein, TcIs the compressor outlet temperature, ηcFor compressor efficiency, TciFor the inlet temperature, pi, of the compressorcThe pressure ratio is gamma, the isentropic index is gamma, the efficiency eta c of the air compressor is obtained from an air compressor MAP file, and the pressure ratio picObtaining real-time working condition parameters of the engine; by compressor outlet temperature TcCalculating the heat exchange requirement of the intercooled temperature controller by combining the following formula:
Qicd＝q·cp·(Tici-Tico) (VI)
Wherein QicdQ is the engine intake air flow, cpSpecific heat capacity at constant pressure, TiciIs the pre-intercooling temperature, TicoThe target intercooled intake air temperature is set;
s200, calculating the required heat exchange quantity of the current working condition in real time according to the working condition of the engine by using an engine heat exchange demand prediction model, wherein the required heat exchange quantity comprises an inter-cooling required heat exchange quantity Qicd；
S300, enabling a heat exchange model of the rack temperature control equipment to exchange heat quantity Q according to intercooling requirementsicdCalculating the heating quantity Q of the intercooled temperature controllerheatAnd cooling capacity Qcool；
S400, according to the heating quantity QheatCalculate saidHeater power P of the temperature controller after cooling according to the cooling quantity QcoolCalculating the heat exchange coefficient h of a heat exchanger in the intercooled temperature controller and variable control parameters influencing the heat exchange coefficient h, wherein the variable control parameters comprise the flow q of the circulating pumpmAnd opening degree P of three-way proportional valvev；
S500, the rack automation control system controls the after-intercooling temperature controller according to the control parameters calculated in the steps S200 to S400 so as to control the temperature boundary of the engine, wherein the after-intercooling temperature controller has the following heat formula:
Qic＝Qheat+Qcool+Qother(A)
Wherein Q isicFor heat exchange capacity of heat exchangers between cooling water and engine intake air, QheatAmount of cooling water heated by heater, QcoolThe heat exchange amount of the chilled water heat exchanger to cooling water, QotherWhich is the heat dissipation loss of the pipeline.
2. The engine rig test temperature boundary control system of claim 1, wherein the amount of heat exchange per unit time of the heat exchanger in the after-cold temperature controller is calculated by the following formula:
Qj＝hAj(Thigh-Tlow) (II)
Wherein h is a heat exchange coefficient; a is the heat exchange area; the medium temperatures at both sides of the heat exchanger are respectively ThighAnd Tlow。
3. The engine rig test temperature boundary control system of claim 2, wherein the heat transfer coefficient h and the circulation pump flow qmOpening P of proportional valve of sum teevThe functional relationship between the two is as follows:
h＝f(qm,Pv) And (III).
4. The engine rig test temperature boundary control system of claim 3, wherein the heating capacity per unit time of the heater is formulated as:
Qheatas P eta (four)
Where P is the heater power and η is the heater efficiency.
5. The engine bench test temperature boundary control system of claim 4, wherein the bench temperature control device heat exchange model is established according to equations (one) to (four).
6. The engine rig test temperature boundary control system of claim 1, wherein the engine heat exchange demand prediction model is established via a mathematical model, a physical simulation model, or a combination of mathematical and physical model.
7. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the engine bench test temperature boundary control method, with an engine bench test temperature boundary control system according to any one of claims 1-6.
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