A method for testing the overall performance of a hybrid vehicle

Abstract

The present invention provides a method for testing the overall performance of a hybrid vehicle. According to the actual working characteristics of the hybrid vehicle, through fewer test combinations and test time, and by making full use of the coupling of the P1, P3 motors and the power battery, combined with the vehicle parameters, the possible working modes of the vehicle are deduced, and targeted tests are carried out to obtain the rated characteristics and peak characteristics of the system, saving the test time and accelerating the test efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of overall performance testing of automobiles, and particularly to a method for testing the overall performance of a hybrid vehicle. Background Art

[0002] For a hybrid system with a P1+P3 architecture, there are driving components such as a drive motor, a generator, and a power battery. Among them, the P1 motor can be used as a generator to supply power to the P3 motor together with the power battery. At the same time, the P1 motor may also be in a working condition of driving the wheels and charging the power battery simultaneously, which leads to complex power flow in the system. If the exhaustive method is used for testing, the number of tests will be excessive.

[0003] The prior art either directly tests the system with an engine according to the vehicle calibration data after connecting the engine, such as the vehicle calibration method, or separately tests the peak performance and rated performance of the P1 and P3 motors; then combines the two for testing, and this method has too many test combinations. Summary of the Invention

[0004] In order to overcome the above technical defects, the purpose of the present invention is to provide a method for testing the overall performance of a hybrid vehicle with high test efficiency and few test conditions.

[0005] The present invention discloses a method for testing the overall performance of a hybrid vehicle, where the performance includes peak performance and rated performance, and the method includes the following steps: when the vehicle speed is V 离合器 or above, the clutch may engage, obtain the speed V 离合器 , and calculate and obtain the engine speed S 离合器 corresponding to the speed V 离合器 ; if the speed V 离合器 corresponding to the current test condition is less than the speed V 实 , then set the engine to work at the speed S 离合器 , and adjust the load to output different engine powers P 离合器 ; if the speed V 发动机 corresponding to the current test condition is greater than or equal to the speed V 实 , then calculate and obtain the engine speed S 离合器 corresponding to the speed V 实 when the clutch engages, set the engine to work at the speed S 实 , and combine the load adjustment to output different engine powers P 实 ; use the power P 发动机 as the test condition to perform the peak performance test and the rated performance test. 发动机

[0006] Preferably, if the speed V corresponding to the current test condition is 实 Less than speed V 离合器 , then set the engine speed to S 离合器 Work and adjust the load to output different engine power P 发动机 Also includes: if the engine speed S 离合器 When working, if the power supply demand for the drive motor cannot be met under the maximum load condition, a working point is sequentially found along the external characteristic curve of the engine to increase the power P 发动机 , so that this operating point meets the power supply demand.

[0007] Preferably, if the speed V corresponding to the current test condition is 实 Greater than or equal to speed V 离合器 , then calculate the speed V 实 The engine speed S corresponding to the clutch engagement 实 , set the engine speed to S 实 Work, combined with load regulation to output different engine power P 发动机 It also includes: if the engine cannot meet the power supply demand of the drive motor at this time, then find a working point along the external characteristic curve of the engine in order to increase the power P 发动机 , so that this operating point meets the power supply demand.

[0008] Preferably, when testing the rated performance, the engine external characteristic curve is sequentially searched for an operating point to increase the power P 发动机 , before the operating point meets the power supply demand, it is necessary to confirm that the heat dissipation of the engine is within the preset heat dissipation threshold.

[0009] Preferably, the peak performance test step is performed when the vehicle is at a speed V 离合器 When the clutch is above, the speed V 离合器 and through the speed V 离合器 Calculate the speed V 离合器 The corresponding engine speed S 离合器 It also includes: giving priority to using the battery pack to power the drive motor; judging whether the maximum discharge operating parameters of the battery pack can meet the peak operating parameters of the drive motor; the operating parameters include power and current; if so, the peak performance of the drive motor is the peak performance of the assembly; if not, the engine is used to drive the generator to generate electricity, and the generated electricity is used to drive the motor to supplement the difference between the operating parameters of the battery pack and the peak operating parameters of the drive motor.

[0010] Preferably, the peak performance test step is performed when the vehicle is at a speed V 离合器When the clutch is above, the speed V 离合器 and through the speed V 离合器 Calculate the speed V 离合器 The corresponding engine speed S 离合器 Previously, it also included: giving priority to using the engine to drive the generator to generate electricity, and then driving the drive motor to work; when the drive motor operates below the peak operating parameters of the generator, it is considered that all the energy for the drive motor to work comes from the generator; and when the power of the generator cannot meet the requirements of the peak operating parameters of the drive motor, the battery pack and the engine simultaneously supply power to the drive motor to supplement the difference between the peak operating parameters of the generator and the peak operating parameters of the drive motor; the operating parameters include power and current.

[0011] Preferably, the rated performance testing step is performed when the vehicle is at a speed V 离合器 When the clutch is above, the speed V 离合器 and through the speed V 离合器 Calculate the speed V 离合器 The corresponding engine speed S 离合器 It also includes: giving priority to using the energy stored in the battery pack to power the drive motor; judging whether the energy stored in the battery pack can continuously output the first preset time length at the rated operating condition of the drive motor; the operating parameters include power and current; if so, the rated performance of the drive motor is the rated performance of the assembly; if not, the generator is driven by the engine to generate electricity, and the generated electricity is used to drive the motor to supplement the difference between the operating parameters of the battery pack and the peak operating parameters of the drive motor; and the rated performance of the drive motor is used as the test boundary.

[0012] Preferably, the rated performance testing step is performed when the vehicle is at a speed V 离合器 When the clutch is above, the speed V 离合器 and through the speed V 离合器 Calculate the speed V 离合器 The corresponding engine speed S 离合器 Previously, it also included: giving priority to using the engine to drive the generator to generate electricity, and then driving the drive motor to work, continuing the first preset time period not exceeding the preset limit, and the motor temperature no longer rises after the first preset time period; if the rated power of the generator is greater than or equal to the rated power of the drive motor, the rated performance of the drive motor is used as the test boundary; if the rated power of the generator is less than the rated power of the drive motor, the rated performance of the generator is used as the test boundary.

[0013] Preferably, the power P 发动机As a test condition, conducting the peak performance test and the rated performance test includes: according to the first rotational speed on the external characteristic curve of the drive motor obtained by simulation, loading the drive motor with a torque to a first torque corresponding to the first rotational speed, and obtaining the total success rate P corresponding to the current condition 总 ; under the power P corresponding to the test condition 发动机 , the following tests are conducted, where the total success rate P 总 is the sum of the power P 发动机 of the engine and the power P 电池包 of the battery pack:

[0014] Observe the temperature rise of the assembly within a second preset duration; if the temperature does not exceed the preset limit within the second preset duration, reduce the torque for cooling and then reload to a second torque point higher than the first torque point to observe the temperature rise; if the temperature exceeds the preset limit within the second preset duration, reduce the torque for cooling and then reload to a third torque point lower than the first torque point to observe the temperature rise; the maximum torque at which the temperature does not exceed the preset limit within the second preset duration is the peak performance corresponding to the test rotational speed.

[0015] Preferably, taking this power P as the test condition, conducting the peak performance test and the rated performance test includes: according to the first rotational speed on the external characteristic curve of the drive motor obtained by simulation, loading the drive motor with a torque to a first torque corresponding to the first rotational speed, and obtaining the total success rate P corresponding to the current condition 总 ; under the power P corresponding to the test condition 发动机 , the following tests are conducted, where the total success rate P 总 is the sum of the power P 发动机 of the engine and the power P 电池包 of the battery pack:

[0016] Observe the temperature rise of the assembly within a second preset duration; if the temperature does not exceed the preset limit within a third preset duration and the motor temperature does not rise after the third preset duration, reload to a second torque point higher than the first torque point to observe the temperature rise; if the temperature exceeds the preset limit within the third preset duration, reload to a third torque point lower than the first torque point to observe the temperature rise; the maximum torque at which the temperature does not exceed the preset limit within the first preset duration and the motor temperature does not rise after the first preset duration is the rated performance corresponding to the test rotational speed.

[0017] After adopting the above technical solution, compared with the prior art, the following beneficial effects are achieved:

[0018] 1. According to the actual working characteristics of the vehicle of the hybrid vehicle, the present invention deduces the possible working modes of the whole vehicle by using fewer test combinations and test time, and fully utilizes the coupling of the P1, P3 motors and the power battery, combines the vehicle parameters, and conducts targeted tests to obtain the rated characteristics and peak characteristics of the system, saving the test time and accelerating the test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 FIG. is a preferred schematic diagram of the peak performance test of the total assembly performance test method for the hybrid vehicle provided by the present invention;

[0020] Figure 2 FIG. is a preferred schematic diagram of the rated performance test of the total assembly performance test method for the hybrid vehicle provided by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The advantages of the present invention will be further elaborated below in conjunction with the drawings and specific embodiments.

[0022] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0023] The terms used in the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The singular forms "a", "the" and "said" used in the present disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0024] It should be understood that although the terms first, second, third, etc. may be used in the present disclosure to describe various information, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present disclosure, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "when" or "while" or "in response to a determination".

[0025] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0026] In the description of the present invention, unless otherwise specified and defined, it should be noted that the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a mechanical connection or an electrical connection, or it may be the communication inside two elements. It may be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0027] In the subsequent description, the use of suffixes such as "module", "component", or "unit" for indicating elements is only for the convenience of the description of the present invention, and they do not have specific meanings themselves. Therefore, "module" and "component" can be used interchangeably.

[0028] This application is used to test the system rated performance / peak performance for the powertrain of hybrid vehicle models, especially for the single-gear powertrain with P1+P3 architecture.

[0029] According to the actual working characteristics of the hybrid vehicle, through fewer test combinations and test time, and by making full use of the coupling of P1, P3 motors and the power battery, combined with the vehicle parameters, the possible working modes of the vehicle are deduced, and targeted tests are carried out to obtain the rated characteristics and peak characteristics of the system.

[0030] The selection of working conditions is directly related to the performance of P1 motor, P3 motor, battery pack and vehicle type, and can better represent the actual vehicle driving conditions. Since the actual operating conditions of the whole vehicle are limited, for the powertrains of different models (referring to those with different working modes and performance parameters) in the present invention, according to their parameters and system characteristics, the impossible working conditions can be excluded, and only the possible and severe working conditions are tested, so as to reduce the test combinations and shorten the test time.

[0031] The driving modes of the P1+P3 single-gear hybrid powertrain include: pure electric drive. In this mode, the drive motor TM is efficiently transmitted to the wheels through two-stage gears, the engine does not work, and the clutch is disengaged, which is applied to urban low-speed cruising and low-speed gentle acceleration scenarios; direct internal combustion engine drive. In this mode, the internal combustion engine directly drives the wheels, and the high-efficiency area combustion drives, the drive motor does not work, and the clutch is connected, which is applied to medium-high speed cruising and gentle acceleration scenarios; regenerative braking energy recovery. In this mode, the clutch is disengaged, and the TM motor efficiently recovers kinetic energy, which is applied to deceleration and downhill scenarios; range extender drive. In this mode, the engine generator generates electricity in the highest efficiency area, the clutch is disengaged, and the TM motor drives alone, which is applied to scenarios with a lower SOC, medium-speed cruising, low-speed rapid acceleration, and overtaking; parallel drive. In this mode, the clutch is connected, and the engine and TM drive the wheels simultaneously, with the best power, which is applied to medium-high speed full-load acceleration scenarios.

[0032] The present invention mainly aims at PHEV hybrid vehicles and HEV hybrid vehicles (strong hybrid).

[0033] For PHEV hybrid vehicles, the battery capacity is large, generally more than ten degrees, and it can continuously output power under rated working conditions; the battery discharge power is large, generally able to meet the demand for the peak torque output of the drive motor. The engine can directly drive the wheels, and it is necessary to consider the engine speed under medium-high speed working conditions for the clutch to engage.

[0034] For HEV hybrid vehicles (strong hybrid), the battery capacity is small, generally about 2 degrees, and the common SOC is 30%-80%, and it can hardly continuously output power under rated working conditions; the battery discharge power is moderate, and it can compensate for the power difference between the drive motor and the generator during peak working conditions. The engine can directly drive the wheels, and it is necessary to consider the engine speed under medium-high speed working conditions for the clutch to engage.

[0035] See the appendix Figure 1-2 , first of all, at the initial stage of the test, a pre-test needs to be carried out, and the power P of the assembly is obtained through this pre-test 总 , and this power is achieved by the vehicle's battery pack and the engine driving the drive motor (this is not the case for all working conditions. In loose working conditions where the battery pack can meet the requirements, the engine is not needed, or in strict working conditions where the generator can meet the requirements, the power of the battery pack is not needed).

[0036] For the battery-priority mode in loose working conditions, the vehicle preferentially uses the power of the battery pack to drive the drive motor. When the power of the battery pack is insufficient to achieve the above total power, the engine generates electricity to drive the drive motor to achieve the remaining power.

[0037] For the fuel priority mode in the severe operating condition mode, the vehicle preferentially uses the engine to generate electricity to drive the generator and then drive the drive motor to keep the state of charge (SOC) of the vehicle's battery pack unchanged.

[0038] For the test of peak performance, a preferred embodiment of this pre-test is provided, including the following steps:

[0039] 1. Obtain the external characteristic curve of the drive motor according to the simulation as the test input;

[0040] 2. On this external characteristic curve, starting from a low speed (e.g., 500 rpm), load the torque to the corresponding point on the external characteristic (e.g., 300 Nm), and observe the temperature rise within 30 s;

[0041] 3. If the temperature does not exceed the preset limit within 30 s, reduce the torque for cooling, and then reload to a higher torque point (e.g., 310 Nm) and observe the temperature rise;

[0042] 4. If the temperature exceeds the preset limit within 30 s, reduce the torque for cooling, and then reload to a lower torque point (e.g., 290 Nm) and observe the temperature rise;

[0043] 5. The maximum torque that can hold for 30 s is the corresponding peak performance at this speed.

[0044] Generally, the main factors restricting the peak characteristics of the motor are motor heat generation, the heat dissipation capacity of the motor, the heat capacity of the stator and rotor, etc.

[0045] It should be noted that although the torque and speed adjusted here are for the drive motor, this pre-test is carried out in the environment of the assembly, rather than only measuring the single drive motor.

[0046] For the test of rated performance, a preferred embodiment of this pre-test is provided, including the following steps:

[0047] Use the rated performance curve obtained from the simulation as the test input

[0048] 1. Obtain the external characteristic curve of the drive motor according to the simulation as the test input;

[0049] 2. On this external characteristic curve, starting from a low speed (e.g., 500 rpm), load the torque to the corresponding point on the external characteristic (e.g., 300 Nm), and observe whether thermal equilibrium can be reached within 30 min;

[0050] 3. If thermal equilibrium is reached within 30 min, load to a higher torque point (e.g., 310 Nm) and observe the temperature rise;

[0051] 4. If the thermal equilibrium is not reached within 5 minutes, load it to a lower torque point (e.g., 290 Nm) and observe the temperature rise.

[0052] 5. The maximum torque that can hold for 30 minutes is the corresponding peak performance at this speed.

[0053] Generally, the main factors restricting the rated characteristics of the motor include the heat generation of the motor, the heat dissipation capacity of the motor, etc. The thermal equilibrium here means that the temperature does not exceed the preset limit within 30 minutes and the motor temperature does not rise after 30 minutes.

[0054] Similarly, although the torque and speed adjusted here are for the drive motor, this pre-test is carried out in the environment of the assembly, not just measuring the single drive motor.

[0055] When the peak performance and rated performance of the assembly are obtained through the pre-test, the engine needs to be further adjusted so that the engine and the battery pack can cooperate to achieve the above peak performance and rated performance. The present invention performs working condition trimming in this step, screens out the necessary working conditions for testing, and greatly reduces the measurement time and measurement cost. The following will describe this part in detail.

[0056] I. Test for peak performance.

[0057] First, considering that there is a possibility of clutch engagement for vehicles of PHEV hybrid vehicles and HEV hybrid vehicles after a certain speed V 离合器 (it should be noted that this does not mean that the clutch is always engaged after this speed), therefore:

[0058] S100. Obtain the speed V 离合器 . When the clutch is engaged, the engine speed S 离合器 corresponding to this speed V 离合器 can be calculated and obtained based on the proportional relationship. 离合器 ;

[0059] S200. If the speed V 实 corresponding to the current test working condition is less than the speed V 离合器 , set the engine to work at the speed S 离合器 and output different engine powers P 发动机 by adjusting the load;

[0060] S300. If the speed V 实 corresponding to the current test working condition is greater than or equal to the speed V 离合器 , calculate and obtain the engine speed S 实 corresponding to the speed V 实 when the clutch is engaged, and set the engine to work at the speed S实 operate, combined with load regulation to output different engine powers P 发动机 .

[0061] Furthermore, for step S200: If the engine operates at a speed S 离合器 and still cannot meet the power supply demand for the drive motor under the maximum load condition, then sequentially search for an operating point along the engine's external characteristic curve to increase the power P 发动机 such that this operating point meets the power supply demand.

[0062] Furthermore, for step S300: If the engine cannot meet the power supply demand for the drive motor at this time, then sequentially search for an operating point along the engine's external characteristic curve to increase the power P 发动机 such that this operating point meets the power supply demand.

[0063] It should be noted that when searching for this operating point, it is necessary to move sequentially along the external characteristic curve, either from left to right or from right to left. However, it is not allowed to skip points. The reason is that if points are skipped, the "optimal operating point" may be missed. Here, the "optimal operating point" is the operating point under the condition of "increasing the power P 发动机 such that this operating point meets the power supply demand".

[0064] After considering the operating characteristics of the engine, the following enters the specific test steps.

[0065] (1) Under the loose condition, that is, the battery pack is preferentially used to supply power to the drive motor:

[0066] Judge whether the maximum discharge power (current) of the battery pack can meet the demand of the peak power (current) of the drive motor;

[0067] If it can, the peak performance of the drive motor is the peak performance of the assembly;

[0068] If it cannot, the engine drives the generator to generate electricity, and the generated electricity is used for the operation of the drive motor to supplement the difference between the power (current) of the battery pack and the peak power (current) of the drive motor.

[0069] (2) Under the strict condition, that is, the fuel mode is preferentially adopted to supply power to the drive motor:

[0070] When the drive motor operates below the peak power (current) of the generator, it is considered that all the energy for the operation of the drive motor comes from the generator;

[0071] When the power of the generator cannot meet the demand for the peak power (current) of the drive motor, the battery pack and the engine supply power to the drive motor simultaneously to supplement the difference between the peak power (current) of the generator and the peak power (current) of the drive motor.

[0072] It should be noted that, under the same working conditions, the heat generated by the operation of the two motors is necessarily greater than that of a single motor. Therefore, at a certain rotational speed, the peak performance that the assembly system can output must be less than or equal to the peak performance of a single drive motor.

[0073] The engine working condition trimming process in the above peak performance test process is applicable to PHEV hybrid vehicles and HEV hybrid vehicles.

[0074] II. For the test of rated performance.

[0075] First, it is also necessary to consider that for PHEV hybrid vehicles and HEV hybrid vehicles, after the vehicle reaches a certain speed V 离合器 above, there is a possibility that the clutch will engage. The specific steps are as above and will not be elaborated here.

[0076] After considering the working characteristics of the engine, the following enters the specific test steps.

[0077] (1) Under the loose working condition, that is, the battery pack is preferentially used to supply power to the drive motor:

[0078] Judge whether the energy stored in the battery pack can continuously output for a first preset duration under the rated working condition of the drive motor;

[0079] If so, the rated performance of the drive motor is the rated performance of the assembly;

[0080] If not, the engine drives the generator to generate electricity, and the generated electricity is used for the operation of the drive motor to supplement the difference between the power (current) of the battery pack and the peak power (current) of the drive motor; since under this test working condition, the generator does not need to work at full load, although the heat generated by the operation of the two motors is necessarily greater than that of a single motor, the performance of the generator can be not considered, so the rated performance of the drive motor is used as the test boundary.

[0081] (2) Under the strict working condition, that is, the fuel mode is preferentially adopted to supply power to the drive motor:

[0082] The engine is preferentially used to drive the generator to generate electricity, and then drive the drive motor to work, continuously for a preset duration (such as 30 min) not exceeding the preset limit value, and the motor temperature does not rise after 30 min;

[0083] If the rated power of the generator is greater than or equal to the rated power of the drive motor, the rated performance of the drive motor is used as the test boundary;

[0084] If the rated power of the generator is less than that of the drive motor, it indicates that the bottleneck of the final thermal test lies in the generator. Although the power performance requirements of the drive motor cannot be met due to insufficient input, from the perspective of maintaining the SOC unchanged, instead of drawing power from the battery, the rated performance of the generator is used as the test boundary.

[0085] Among them, for the small battery of the HEV, it can only discharge continuously at a very small power. Therefore, the power that can be stably provided under the rated working conditions can be ignored. It is considered that the energy required by the drive motor is completely supplied by the engine driving the generator.

[0086] Preferably, when testing the rated performance, a working condition point is sequentially searched along the external characteristic curve of the engine to increase the power P 发动机 , and before the working condition point meets the power supply requirements, it is necessary to confirm that the heat dissipation of the engine is within the preset heat dissipation threshold.

[0087] The following is a specific understanding through an example:

[0088] For testing the peak performance, in the case of the battery being prioritized under the loose working condition, at a certain test working condition, the speed of the drive motor is 5000 rpm. By predicting the torque at the current speed through the external characteristic curve to be 300 Nm, the power demand P of the total system can be calculated 总 to be 5000×300 / 9550 = 157 kW.

[0089] If the maximum performance of the battery pack is 100 kW, then the remaining 57 kW needs to be achieved by the engine driving the generator to generate electricity. And how to achieve this 57 kW power is achieved through the methods under the above-mentioned strict and loose working conditions, that is, implemented through the content of "I. For the test of peak performance" above.

[0090] If in this working condition, due to the heat generation of both the drive motor and the generator, which brings losses and causes this working condition to not be able to last for the first preset duration (such as 30 s above), it indicates that the peak capacity of the system cannot reach the power of 157 kW corresponding to 300 Nm. At this time, according to the principle of the pre-test, after cooling, keep the speed of 5000 rpm unchanged, reduce the torque output (such as 290 Nm), and then retest.

[0091] At this time, at a torque of 290 Nm, the power demand P of the total system 总 is 5000×290 / 9550 = 151.8 kW. The output capacity of the battery pack remains unchanged at 100 kW, then the power difference that needs to be compensated by the engine generating electricity decreases to 51.8 kW. Adjust continuously accordingly until the temperature rise situation of the total system meets the requirements in the pre-test.

[0092] It should be noted that the embodiments of the present invention have better implementability and do not impose any form of limitation on the present invention. Any person skilled in the art may use the technical content disclosed above to modify or transform it into equivalent effective embodiments. However, as long as it does not depart from the technical solution of the present invention, any modification, equivalent change or modification made to the above embodiments based on the technical essence of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A method for testing the overall performance of a hybrid vehicle, where the performance includes peak performance and rated performance, characterized in that, It includes the following steps: The vehicle is at speed V 离合器 or above, the clutch may engage, obtain the speed V 离合器 , and through the speed V 离合器 calculate to obtain the engine speed S corresponding to this speed V 离合器 ; 离合器 ; If the speed V corresponding to the current test condition 实 is less than the speed V 离合器 , then set the engine to operate at the rotational speed S 离合器 and output different engine powers P by adjusting the load 发动机 ; If the speed V corresponding to the current test condition 实 is greater than or equal to the speed V 离合器 , then calculate and obtain the engine speed S corresponding to the clutch engagement 实 , and set the engine to operate at the speed S 实 , and combine the load adjustment to output different engine powers P 实 ; 发动机 ; At this power P 发动机 Conduct the peak performance test and the rated performance test under this test condition; If the speed V corresponding to the current test condition 实 is less than the speed V 离合器 , then the engine is set to operate at the rotational speed S 离合器 , and different engine powers P are output by adjusting the load 发动机 It also includes: If the engine operates at a rotational speed S 离合器 and still cannot meet the power supply demand for the drive motor under the maximum load condition during operation, then sequentially search for an operating point along the external characteristic curve of the engine to increase the power P 发动机 so that this operating point meets the power supply demand; Among them, when finding this operating point, it is necessary to move along the external characteristic curve in turn, either from left to right or from right to left; The test steps for the peak performance are as follows: when the vehicle speed is V 离合器 or above, the clutch may engage. Obtain the speed V 离合器 , and calculate and obtain the engine speed S corresponding to the speed V through the speed V 离合器 before that, it also includes: 离合器 The engine speed S corresponding to the speed V 离合器 Before that, it also includes: Preferably, the engine drives the generator to generate electricity, and then drives the drive motor to work; When the drive motor operates below the peak operating parameters of the generator, it is considered that all the energy for the drive motor to operate comes from the generator; When the power of the generator cannot meet the requirements of the peak operating parameters of the drive motor, the battery pack and the engine supply power to the drive motor simultaneously to supplement the difference between the peak operating parameters of the generator and the peak operating parameters of the drive motor; The operating parameters include power and current; Or, The test steps of the rated performance are as follows: when the vehicle speed is V 离合器 or above, the clutch may engage. Obtain the speed V 离合器 , and through the speed V 离合器 calculate and obtain the engine speed S corresponding to this speed V 离合器 Before that, it also includes: 离合器 ​ Preferably, the energy stored in the battery pack is used to supply power to the drive motor; Judge whether the energy stored in the battery pack can continuously output for a first preset duration under the rated operating conditions of the drive motor; the operating parameters include power and current; If so, the rated performance of the drive motor is the rated performance of the assembly; If not, the engine drives the generator to generate electricity, and the generated electricity is used for the operation of the drive motor to supplement the difference between the operating parameters of the battery pack and the peak operating parameters of the drive motor; and the rated performance of the drive motor is used as the test boundary.

2. The assembly performance testing method according to claim 1, characterized in that, If the speed V corresponding to the current test condition 实 is greater than or equal to the speed V 离合器 , then calculate and obtain the speed V 实 at the engine speed S corresponding to the clutch engagement 实 , and set the engine to operate at the speed S 实 to output different engine powers P by combining load regulation 发动机 It further includes: If the engine cannot meet the power supply demand for the drive motor at this time, a working point is sequentially searched along the external characteristic curve of the engine to increase the power P 发动机 so that the working point meets the power supply demand.

3. The assembly performance test method according to claim 2, characterized in that When testing the rated performance, sequentially find a working condition point along the external characteristic curve of the engine to increase the power P 发动机 , before ensuring that this working condition point meets the power supply requirements, it is necessary to confirm that the heat dissipation of the engine is within the preset heat dissipation threshold.

4. The assembly performance testing method according to claim 2, wherein The test steps for the peak performance are as follows: when the vehicle speed is V 离合器 or above, the clutch may engage. Obtain the speed V 离合器 , and through the speed V 离合器 calculate and obtain the engine speed S corresponding to this speed V 离合器 Before that, it also includes: 离合器 ​ Preferably, the battery pack is used to supply power to the drive motor; Judge whether the maximum discharge operating parameters of the battery pack can meet the requirements of the peak operating parameters of the drive motor; the operating parameters include power and current; If it can, the peak performance of the drive motor is the peak performance of the assembly; If not, the engine drives the generator to generate electricity, and the generated electricity is used for the operation of the drive motor to supplement the difference between the operating parameters of the battery pack and the peak operating parameters of the drive motor.

5. The assembly performance test method according to claim 2, characterized in that The test steps for the rated performance are as follows: when the vehicle is at a speed V 离合器 or higher, the clutch may engage. Obtain the speed V 离合器 , and based on the speed V 离合器 calculate and obtain the engine speed S corresponding to the speed V 离合器 . Before that, it also includes: 离合器 ​ Preferably, the engine drives the generator to generate electricity, and then drives the drive motor to work, and the first preset duration lasts no more than a preset limit, and the motor temperature no longer rises after the first preset duration; If the rated power of the generator is greater than or equal to the rated power of the drive motor, the rated performance of the drive motor is used as the test boundary; If the rated power of the generator is less than the rated power of the drive motor, the rated performance of the generator is used as the test boundary.

6. The assembly performance test method according to claim 2, characterized in that At the power P 发动机 As the test condition, performing the peak performance test and the rated performance test includes: According to the first rotational speed on the external characteristic curve of the drive motor obtained from the simulation, load the drive motor with a torque up to the first torque corresponding to the first rotational speed, and obtain the total success rate P corresponding to the current working condition 总 ; At the power P corresponding to the test working condition 发动机 , conduct the following tests, where the total success rate P 总 is the power P of the engine 发动机 and the power P of the battery pack 电池包 sum: Observe the temperature rise of the assembly within a second preset duration; If the temperature does not exceed the preset limit within the second preset duration, reduce the torque for cooling and then reload to a second torque point higher than the first torque point, and observe the temperature rise; If the temperature exceeds the preset limit within the second preset duration, reduce the torque for cooling and then reload to a third torque point lower than the first torque point, and observe the temperature rise; The maximum torque at which the temperature does not exceed the preset limit within the second preset duration is the peak performance corresponding to the test speed.

7. The assembly performance test method according to claim 2, characterized in that, Taking the power P as the test condition, the peak performance test and the rated performance test include: According to the first speed on the external characteristic curve of the drive motor obtained from the simulation, load the drive motor with a torque up to the first torque corresponding to the first speed, and obtain the total success rate P corresponding to the current working condition 总 ; At the power P corresponding to the test working condition 发动机 , conduct the following tests, where the total success rate P 总 is the power P of the engine 发动机 and the power P of the battery pack 电池包 sum: Observe the temperature rise of the assembly within a third preset duration: If the temperature does not exceed the preset limit within the third preset duration and the motor temperature no longer rises after the third preset duration, reload to a second torque point higher than the first torque point, and observe the temperature rise; If the temperature exceeds the preset limit within the third preset duration, it is reloaded to a third torque point lower than the first torque point to observe the temperature rise; The maximum torque at which the temperature does not exceed the preset limit within the third preset duration and the motor temperature no longer rises after the third preset duration is the rated performance corresponding to the test speed.

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