CN117471226B - High-voltage analog load test system and method suitable for BMS - Google Patents
High-voltage analog load test system and method suitable for BMS Download PDFInfo
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Abstract
The invention relates to a high-voltage analog load test system and method suitable for BMS, belongs to the technical field of new energy test systems, and particularly relates to a new energy storage and vehicle-mounted environment test system and method. The test system comprises a data acquisition interface, a data acquisition module and a data processing module, wherein the data acquisition interface is used for acquiring load data of a load to be tested; HV_LOAD is used for adjusting the simulated LOAD data according to the LOAD data; and the BMS is used for judging whether the load simulation result is abnormal according to the single battery working state data. According to the invention, the HV_LOAD is used for realizing the real simulation of the LOAD conditions of the whole vehicle or other electric equipment and charging equipment by adjusting the change-over switch and the LOAD simulation module and judging the LOAD simulation result by collecting the working state of the battery monomer, so that the system is high in integration level, small in size, convenient to carry and capable of rapidly positioning and solving the problems of various high-voltage terminals.
Description
Technical Field
The invention belongs to the technical field of new energy testing systems, and particularly relates to a high-voltage analog load testing system and method capable of simulating BMS practical use environments such as charging and discharging of an energy storage PACK and the like for a new energy vehicle.
Background
With the high-speed development of new energy technology, the application of energy storage PACK is greatly popularized. The energy storage PACK is an energy storage system unit formed by a plurality of battery assemblies connected in series or in parallel, has huge capacity and higher power output capacity, can balance energy supply and demand, and improves the energy utilization rate. The energy storage PACK is specifically applied to the fields of new energy automobiles, power grid energy storage, distributed energy storage and new energy power stations, and is generally used in combination with a Battery management system (i.e., battery MANAGEMENT SYSTEM, hereinafter abbreviated as BMS) for monitoring the working state of the energy storage PACK, and managing and maintaining each Battery assembly.
In the new energy vehicle and the energy storage system, in order to ensure that the BMS can identify and solve various high-voltage end problems encountered in the terminal use environment in advance, product delivery environment simulation test and fault part analysis are required to be carried out on the new energy battery. In the new energy system, on one hand, the high-voltage end test items include a high-voltage acquisition test, a relay adhesion test, a current acquisition test, a whole vehicle load environment test, an insulation detection test, and a simulation reproduction test of high-voltage problems occurring in various loads of the integrated BMS, while the conventional EOL and HIL tests of the BMS are insufficient to identify the actual high-voltage problems encountered in the actual use process of the vehicle or the stored energy (the EOL test is a test performed at the end of the life cycle of the product, and the HIL test is a test of establishing a connection between the actual hardware and the simulation model to verify the performance of the hardware device in the actual operation environment). On the other hand, EOL and HIL high voltage test systems in the prior art have complex structures, large volumes and difficult portability, and are difficult to quickly locate and solve the problems of various high voltage ends.
Disclosure of Invention
The invention aims to solve the problems and provide a high-voltage analog load test system which has a simple structure and reasonable design and is suitable for BMS.
The invention realizes the above purpose through the following technical scheme:
A high voltage analog load test system for a BMS, the test system being electrically supported by a battery module, comprising:
the data acquisition interface is used for acquiring load data of a load to be detected;
A high-voltage analog LOAD box (i.e., high voltage LOAD box, hereinafter abbreviated as hv_load) for performing adjustment of analog LOAD data according to the LOAD data;
And the BMS is used for collecting the working state data of the battery unit of the battery module after the adjustment of the simulation load data is finished, judging whether the load simulation result is abnormal according to the working state data of the battery unit, if so, outputting the load simulation result, otherwise, outputting the load simulation result to be normal, and the testing system further comprises a display terminal for receiving and presenting the load simulation result.
As a further optimization scheme of the invention, the HV_LOAD comprises a LOAD simulation module, a power relay module and a current detection module; wherein,
The load simulation module is used for simulating a load to be tested to form simulated load data;
The power relay module is used for controlling load current and providing high-voltage data for the BMS;
the current detection module is used for providing current data for the BMS.
As a further optimization scheme of the invention, an electric loop is formed among the battery module, the power relay module, the current detection module and the load simulation module, and the load simulation module comprises an adjustable capacitive load, an inductive load and a change-over switch; wherein,
The change-over switch is used for adjusting the topological structure of the electric loop;
the adjustable capacitive LOAD and the inductive LOAD are used for adjusting the phase difference between the current and the voltage of the electric loop so as to simulate the actual LOAD condition by HV_LOAD.
As a further optimization scheme of the invention, the BMS collects high-voltage data of the power relay module through the high-voltage collection wire harness and sends a control signal to the power relay module through the low-voltage control wire harness, and the BMS collects current data of the current detection module through the current collection wire harness.
As a further optimization scheme of the invention, the high-voltage end and the low-voltage end of the load simulation module are connected with expansion interfaces.
As a further optimization scheme of the invention, the hv_load further comprises an adjustable insulation resistance, and the adjustable insulation resistance is used for simulating an insulation resistance detection precision test of the BMS and simulating a test under an actual insulation environment of the BMS.
As a further optimization scheme of the invention, the hv_load further comprises a battery pack capacitive LOAD and a metal shell for shielding interference, wherein the battery pack capacitive LOAD is used for simulating a battery module Y capacitance test environment.
As a further optimization scheme of the invention, the power relay module comprises a main positive relay, a pre-charging relay, a fast-charging positive relay, a main negative relay, a fast-charging negative relay and a heating relay, and the current detection module is a current divider.
A high-voltage analog load testing method based on the testing system comprises the following steps:
step one, collecting load data of a load to be tested;
Step two, adjusting the simulated load data according to the load data;
And thirdly, after the simulated load data are regulated, acquiring the working state data of the battery unit of the battery module, judging whether the load simulation result is abnormal according to the working state data of the battery unit, if so, outputting the abnormal load simulation result, otherwise, outputting the normal load simulation result.
The invention has the beneficial effects that:
According to the invention, LOAD simulation test is carried out according to LOAD data of a LOAD to be tested, the HV_LOAD forms simulated LOAD data by adjusting the change-over switch and the LOAD simulation module, and the LOAD simulation result is judged by collecting the working state of the battery monomer, so that the real simulation of the LOAD conditions of the whole vehicle or other electric equipment and charging equipment is realized, and the system has high integration level, small volume and convenient carrying, and can rapidly position and solve the problems of various high-voltage ends;
According to the invention, the DCDC/MCU LOAD X capacitance of the whole vehicle is simulated through the first capacitance, the second capacitance and the third capacitance are used for simulating the Y capacitance of the whole vehicle, the inductive LOAD is simulated through the inductance, the Y capacitance of the HV_LOAD shell of the positive and negative pairs of the battery module is respectively simulated through the fourth capacitance and the fifth capacitance, and when the vehicle energy storage PACK is tested, other LOADs can be additionally arranged between the two expansion ports, so that the LOAD simulation module in the HV_LOAD can cover the test of all LOAD environments of the whole vehicle, and the simulation effect is improved;
The invention integrates a high-voltage acquisition test, a relay adhesion test, a current acquisition test, a whole vehicle load environment test, an insulation detection test and a simulation reproduction test of high-voltage problems of various different loads of an integrated BMS (battery management system), so as to rapidly solve terminal problems. The high-voltage end test project of the test system has high coverage rate, strong expandability, low cost and high benefit;
According to the invention, the LOAD simulation module in the HV_LOAD is isolated through the change-over switch, and the two expansion ports are connected with the actual electric equipment or charging equipment, so that the real-time monitoring of products is realized, and the test system can be suitable for product research and development and new product factory bottoming test processes, can be used as a fault part analysis tool, and has wide application fields.
Drawings
FIG. 1 is a schematic diagram of the test electrical connection of the stored energy PACK of the present invention with a BMS and HV_LOAD;
fig. 2 is a schematic diagram of the internal structure of the hv_load of the present invention.
Detailed Description
The present application will be described in further detail with reference to the accompanying drawings, wherein it is to be understood that the following detailed description is for the purpose of further illustrating the application only and is not to be construed as limiting the scope of the application, as various insubstantial modifications and adaptations of the application to those skilled in the art can be made in light of the foregoing disclosure.
Example 1
As shown in fig. 1, a high-voltage analog load test system suitable for BMS, which specifically relates to a new energy storage and vehicle-mounted environment test system (Vehicle mounted BMS, energy storage BMS environmental TESTING SYSTEM), wherein the test system uses a battery module as a test object and uses the battery module as a power supply. In the research and development process of the energy storage PACK product, the battery module selects an analog battery, and the input and the output of the energy storage PACK are simulated through the analog battery; in the new product delivery model test process of the energy storage PACK, or in the process of using the energy storage PACK as a fault part analysis tool, the battery module is the energy storage PACK. The high-voltage analog LOAD test system comprises a data acquisition interface for acquiring LOAD data of a LOAD to be tested, a BMS for monitoring the working state of the battery module, and a HV_LOAD for simulating the LOAD condition of the actual use environment of the BMS.
The data acquisition interface can receive LOAD data of a LOAD to be tested, in the test process, an operator can input the LOAD data to be tested to the data acquisition interface through the data input module, and the data acquisition interface transmits the LOAD data to the HV_LOAD, wherein the LOAD to be tested is the actual LOAD of the whole vehicle or the LOAD of other electric equipment; the BMS comprises a power relay module control module, a high-voltage acquisition module, an insulation acquisition module, a master-slave CAN port, a 485 communication port drive, an on-board current detection module, a single voltage detection module, an equalization module, a battery cell temperature detection module and a heating control module which are corresponding to the power relay module in the test system; the HV_LOAD comprises a power relay module, a current detection module, an adjustable capacitive LOAD, an inductive LOAD and a metal shell for shielding interference, wherein the power relay module, the current detection module, the adjustable capacitive LOAD and the inductive LOAD are all arranged inside the metal shell of the HV_LOAD, a change-over switch is further arranged in the shell, and two expansion ports are arranged on the shell. The change-over switch is used for switching on the circuit of the adjustable capacitive load, the inductive load, the power relay module, the current detection module and the expansion port, the expansion port is used for providing an external terminal, a controller is further arranged in the metal shell, the data acquisition interface is connected with the controller, the controller is used for receiving load data sent by the data acquisition interface, the load to be tested is simulated through the load simulation module, and the change-over switch and the adjustable capacitive load are adjusted according to the load data, so that simulated load data equivalent to the load data is formed. In addition, the test system also comprises a display terminal for receiving and presenting the load simulation result, wherein the display terminal can be a display electrically connected with the BMS, or can be a mobile terminal which is carried by an operator and can perform wireless data interaction with the BMS.
The HV_LOAD adjusts the change-over switch through the controller to adjust the circuit conduction of the adjustable capacitive LOAD and the inductive LOAD so that a desired electrical loop is formed between the battery module and the HV_LOAD, and the battery module provides power to the electrical loop. And meanwhile, the controller also adjusts the capacitance of the adjustable capacitive load to enable the electric loop to be capacitive or inductive, and enables the phase difference between the current and the voltage of the electric loop to be matched with the load condition of the actual use environment, so that other real loads can be additionally arranged between the two expansion ports according to actual needs. The BMS collects all battery monomer working state data in the battery module, the battery monomer working state data comprises voltage data and current data of the battery monomer, meanwhile, the BMS also collects high-voltage data and current data of the electric loop through a power relay module and a current collecting module in the HV_LOAD, the BMS analyzes the data, in the analysis process, the BMS compares the collected voltage and current data with a voltage preset value and a current preset value, and when the collected voltage or current of the BMS exceeds the preset value, the BMS indicates that the high-voltage end problem exists on the measured electric loop, so that the monitoring of the battery module is realized. The system adjusts the structure of the electric loop through the change-over switch, realizes the real simulation of the LOAD condition of the whole car or other electric equipment and charging equipment by setting the adjustable capacitive LOAD and the inductive LOAD in the HV_LOAD, has high system integration level, small volume and convenient carrying, and can rapidly position and solve the problems of various high-voltage ends.
Specifically, as shown in fig. 1 and 2, the BMS is externally connected with a high-voltage acquisition wire harness and a current acquisition wire harness, and a switch signal detection port and a power relay module control module are arranged on the outer side of the BMS, wherein the switch signal detection port comprises ports such as high-bottom side switch detection, insulation switch detection, high-voltage interlocking detection and the like. The housing of the HV_LOAD is provided with a total positive port and a total negative port of the battery module, two expansion ports, a high-voltage acquisition wire harness interface, a power relay module control interface, a current acquisition interface and a ground interface. The BMS is connected with the high-voltage acquisition wire harness and the current acquisition wire harness through the two connectors respectively, so that the BMS can acquire high-voltage data of the power relay module through the high-voltage acquisition wire harness and current data of the current acquisition module through the current acquisition wire harness, and the BMS is connected with the low-voltage control wire harness through the power relay module control module and can send control signals to the power relay module through the low-voltage control wire harness. The HV_LOAD is provided with a B+ port and a B-port, and the B+ port and the B-port are respectively connected with the positive electrode and the negative electrode of the battery pack; one connector is provided with a RLYn + port and a RLYn-port, the RLYn + port is connected with primary side driving power supplies of relay switches such as a main positive electrode, a main negative electrode, a quick charge positive electrode, a quick charge negative electrode, a pre-charge, heating and the like, and the RLYn-port is connected with a high-voltage output port in the BMS; the other connector is provided with an HVn port and a SENSE +/-port, the HVn port is used for high-voltage data acquisition and is connected with a high-voltage acquisition interface in the BMS, and the SENSE +/-port is used for current data acquisition and is connected with a current acquisition wire harness.
The HV_LOAD further includes an adjustable insulation resistance for simulating an insulation resistance detection accuracy test of the BMS and a test under an actual insulation environment of the BMS, and the adjustable insulation resistance is divided into a first insulation resistance R1 and a second insulation resistance R2. The HV_LOAD further comprises a battery pack capacitive LOAD arranged inside the shell, the battery pack capacitive LOAD is used for simulating a battery module Y capacitance testing environment, the battery pack capacitive LOAD is divided into a fourth capacitor C4 and a fifth capacitor C5, the fourth capacitor C4 is specifically used for simulating a battery module positive electrode to the Y capacitor of the shell, the fifth capacitor C5 is specifically used for simulating a battery module negative electrode to the Y capacitor of the shell, the capacity values of the fourth capacitor C4 and the fifth capacitor C5 are 1nF, and the voltages at two ends of the fourth capacitor C4 and the fifth capacitor C5 are 2kV.
Further, referring to fig. 2, the adjustable capacitive load is divided into an adjustable X capacitor and an adjustable Y capacitor, the adjustable X capacitor is composed of a first capacitor C1 and a variable capacitor moving plate driving device, the adjustable Y capacitor is composed of a second capacitor C2 and a third capacitor C3 which are connected in series with each other and another two variable capacitor moving plate driving devices, and the moving plates of the capacitors C1, C2 and C3 are rotated to adjust the capacitance value of the capacitor, and the inductive load is an inductance L. The three variable capacitance sheet driving devices can respectively drive the movable sheets of the first capacitor C1, the second capacitor C2 and the third capacitor C3 to rotate by corresponding angles according to the control instruction of the controller in the HV_LOAD, so as to realize capacitance adjustment. Specifically, the driving device may be a motor, or may be a driving component composed of a motor and a worm gear reduction transmission mechanism. The first capacitor C1 is used for simulating a DCDC/MCU load X capacitor of the whole vehicle, and the capacitance value adjusting range is between 470 mu F and 4.7 mF; the second capacitor C2 and the third capacitor C3 are used for simulating the whole vehicle Y capacitor, and the capacitance value of the second capacitor C2 and the third capacitor C3 is adjusted to be between 1 mu F and 2.2 mF. The inductive LOAD is respectively connected with the adjustable X capacitor and the adjustable Y capacitor in parallel, the expansion port is divided into a PACK+ port and a PACK-port, and when the energy storage PACK for the vehicle is tested, other LOADs connected with the inductive LOAD in parallel can be additionally arranged between the PACK+ port and the PACK-port, so that the LOAD simulation module in the HV_LOAD can cover the test of all LOAD environments of the whole vehicle.
The power relay module includes main positive relay K1, pre-charge relay K2, fast charge positive relay K3, main negative relay K4, fast charge negative relay K5 and heating relay K6, current acquisition module is the shunt, main positive relay K1 and pre-charge relay K2 all link to each other with first node D1, and main positive relay K1 and pre-charge relay K2 are parallelly connected each other, main positive relay K1 is established ties with fast charge positive relay K3, be equipped with second node D2 between main negative relay K4 and the shunt, first node D1 is connected with battery module's anodal and an interface through the high voltage acquisition pencil, second node D2 links to each other through electric current acquisition pencil and battery module's negative pole and another interface, first electric capacity C1 and inductance L's one end all is connected on fourth node D4, third node D3 and fourth node D4 are connected with third electric capacity C2 and third electric capacity C3 respectively, be equipped with fifth node D5R 5 and positive relay D1, the fifth node D5 is connected with fifth node D7, the positive relay D5 is connected with fifth node D5, the positive relay D5 is connected with fifth node D7, the positive relay D5 is connected with the fifth node D5, the positive connection is formed between the fifth node D5, the positive relay D5 is connected with the fifth node D5, the electric resistance D5 is connected with the fifth node D5. The BMS is used for controlling the power relay module to be turned on and off according to various time sequences through the output of the internal high-low side power supply, collecting analog quantities such as high voltage, insulation and current through the analog quantity input port, and testing whether the power relay module is adhered or not through the collected high-voltage data. The system is integrated with a high-voltage acquisition test, a relay adhesion test, a current acquisition test, a whole vehicle load environment test, an insulation detection test and a simulation reproduction test of high-voltage problems of various different loads of an integrated BMS (battery management system) so as to quickly solve terminal problems. The high-voltage end test project of the test system has high coverage rate, strong expandability, small volume, low cost and high benefit.
Still further, as shown in fig. 2, the change-over switch includes a first switch S1 between a third node D3 and the precharge relay K2 and the fast charge positive relay K3, a second switch S2 between a fourth node D4 and the fast charge negative relay K5 and the eighth node D8, a third switch S3 between the third node D3 and the first capacitor C1, a fourth switch S4 between the fourth node D4 and the first capacitor C1, a fifth switch S5 between the third node D3 and the second capacitor C2, a sixth switch S6 between the fourth node D4 and the third capacitor C3, a seventh switch S7 between the fifth node D5 and the second capacitor C2 and the third capacitor C3, an eighth switch S8 between the third node D3 and the inductor L, a ninth switch S9 between the fourth node D4 and the inductor L, a tenth switch S10 between the third node D3 and the pack+ port, and an eleventh switch S11 between the fourth node D4 and the PACK-port. By adjusting the first switch S1 and the second switch S2, the electrical circuit of the test system can be switched, so that a fast charge circuit or a pre-charge circuit is formed between the battery module and the hv_load, and different electrical circuits can be tested respectively.
Isolation and connection of the first capacitor C1 can be achieved by adjusting the third switch S3 and the fourth switch S4; isolation and connection of the second capacitor C2 and the third capacitor C3 can be achieved by adjusting the fifth switch S5, the sixth switch S6 and the seventh switch S7; isolation and connection of the inductance L can be achieved by adjusting the eighth switch S8 and the ninth switch S9. By adjusting the tenth switch S10 and the eleventh switch S11, the circuit conduction conditions of the pack+ port and the PACK-port can be adjusted. Through the operation, the electric loop can be further adjusted, so that the load simulation module is closer to the actual use scene of the battery module, and the test precision is improved. The test system can also be used for isolating the adjustable capacitive load and the inductive load by using the change-over switch, and connecting the PACK+ port and the PACK-port with actual electric equipment or charging equipment respectively, and monitoring the charge and discharge conditions of the actual battery module in real time by using the test system so as to realize that the test system is used as a fault part analysis tool.
Example 2
A high voltage analog load testing method based on the testing system in the first embodiment, comprising the steps of:
Step one, realizing the collection of LOAD data of a LOAD to be tested by connecting a data acquisition interface on the HV_LOAD, wherein an operator can transmit the LOAD data to be tested to the data acquisition interface through a data input module, and the data acquisition interface transmits the LOAD data to be tested to a controller of the HV_LOAD;
Step two, the HV_LOAD carries out adjustment of simulated LOAD data according to the LOAD data, the HV_LOAD adjusts the circuit conduction state of an adjustable capacitive LOAD and an inductive LOAD through the controller in cooperation with a change-over switch, an expected electric loop is formed between a battery module and the HV_LOAD, and power support is provided for the electric loop through the battery module, meanwhile, the controller also enables the electric loop to be capacitive or inductive through adjustment of the capacitance value of the adjustable capacitive LOAD, the phase difference between the current and the voltage of the electric loop is matched with the LOAD state of an actual use environment, the HV_LOAD is provided with expandability through the arrangement of an expansion port, and when the LOAD simulation module in the HV_LOAD is insufficient to simulate the actual use scene LOAD state, other LOADs can be connected between a PACK+ port and a PACK-port;
and thirdly, after the adjustment of the simulated LOAD data is finished, the BMS acquires the battery monomer working state data of the battery module, meanwhile, the BMS also respectively acquires the high-voltage data and the current data of the electric loop through the power relay module and the current divider in the HV_LOAD, analyzes the data, judges whether the LOAD simulation result is abnormal according to the battery monomer working state data and the high-voltage data and the current data of the electric loop, if so, outputs the LOAD simulation result to be abnormal, otherwise, outputs the LOAD simulation result to be normal, and realizes the simulation test of the battery module and the LOAD to be tested.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.
Claims (7)
1. A high voltage analog load testing system adapted for use in a BMS, the testing system being electrically supported by a battery module, comprising:
the data acquisition interface is used for acquiring load data of a load to be detected;
The high-voltage analog load box is used for adjusting analog load data according to the load data;
The battery management system is used for collecting the working state data of the battery unit of the battery module after the adjustment of the simulated load data is finished, judging whether the load simulation result is abnormal according to the working state data of the battery unit, if so, outputting the abnormal load simulation result, otherwise, outputting the normal load simulation result;
The high-voltage analog load box comprises a load analog module, a power relay module and a current detection module; wherein,
The load simulation module is used for simulating a load to be tested to form simulated load data;
the power relay module is used for controlling load current and providing high-voltage data for the battery management system;
the current detection module is used for providing current data for the battery management system;
An electrical loop is formed among the battery module, the power relay module, the current detection module and the load simulation module, and the load simulation module comprises an adjustable capacitive load, an inductive load and a change-over switch; wherein,
The change-over switch is used for adjusting the topological structure of the electric loop;
The adjustable capacitive load and the inductive load are used for adjusting the phase difference between the current and the voltage of the electric loop so as to realize the simulation of the high-voltage analog load box on the actual load condition;
The battery management system collects high-voltage data of the power relay module through the high-voltage collection wiring harness and sends control signals to the power relay module through the low-voltage control wiring harness, and the battery management system collects current data of the current detection module through the current collection wiring harness.
2. The high-voltage analog load test system suitable for BMS according to claim 1, wherein: and the high-voltage end and the low-voltage end of the load simulation module are connected with expansion interfaces.
3. The high-voltage analog load test system suitable for BMS according to claim 1, wherein: the adjustable capacitive load is divided into an adjustable X capacitor and an adjustable Y capacitor, and the inductive load is respectively connected with the adjustable X capacitor and the adjustable Y capacitor in parallel.
4. The high-voltage analog load test system suitable for BMS according to claim 1, wherein: the high-voltage analog load box further comprises an adjustable insulation resistor, wherein the adjustable insulation resistor is used for simulating insulation resistance detection precision tests of the battery management system and tests under actual insulation environments of the battery management system.
5. The high-voltage analog load test system suitable for BMS according to claim 1, wherein: the high-voltage analog load box further comprises a battery pack capacitive load and a metal shell for shielding interference, wherein the battery pack capacitive load is used for simulating a battery module Y capacitance testing environment.
6. The high-voltage analog load test system suitable for BMS according to claim 1, wherein: the power relay module comprises a main positive relay, a pre-charging relay, a quick-charging positive relay, a main negative relay, a quick-charging negative relay and a heating relay, and the current detection module is a current divider.
7. A high voltage analog load test method, characterized in that it is based on a high voltage analog load test system according to any of claims 1-6, which is suitable for BMS, comprising the steps of:
step one, collecting load data of a load to be tested;
Step two, adjusting the simulated load data according to the load data;
And thirdly, after the simulated load data are regulated, acquiring the working state data of the battery unit of the battery module, judging whether the load simulation result is abnormal according to the working state data of the battery unit, if so, outputting the abnormal load simulation result, otherwise, outputting the normal load simulation result.
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