CN-121995248-A - Method and system for testing electric quantity retention performance of hybrid electric vehicle in plateau environment

CN121995248ACN 121995248 ACN121995248 ACN 121995248ACN-121995248-A

Abstract

The invention discloses a method and a system for testing electric quantity maintenance performance of a hybrid electric vehicle in a plateau environment, wherein the method comprises the steps of obtaining environment information, battery aging degree of the hybrid electric vehicle and rated electric quantity of the hybrid electric vehicle, calculating equivalent available electric quantity of the vehicle in the plateau environment, wherein the environment information comprises altitude and environment temperature, dividing a driving period of the hybrid electric vehicle into a plurality of time slices according to a certain time step, setting a battery charge state estimation model, calculating the charge state of each time point according to the equivalent available electric quantity, setting a battery internal resistance estimation model, calculating the battery internal resistance of each time point according to the charge state, calculating the maximum safe discharge power of each time point according to the battery internal resistance, obtaining the actual maximum discharge power of each time point, comparing the actual maximum discharge power with the corresponding maximum safe discharge power, and determining whether the corresponding time point and the actual maximum discharge power are abnormal.

Inventors

WANG JIGUANG
XU FENG

Assignees

中汽研汽车检验中心(昆明)有限公司

Dates

Publication Date: 20260508
Application Date: 20251230

Claims (10)

1. The method for testing the electric quantity retention performance of the hybrid electric vehicle in the plateau environment is characterized by comprising the following steps of: Acquiring environment information, battery aging degree of a hybrid electric vehicle and rated electric quantity of the hybrid electric vehicle, and calculating equivalent available electric quantity of the vehicle in a plateau environment, wherein the environment information comprises altitude and environment temperature; Dividing the driving period of the hybrid electric vehicle into a plurality of time slices according to a certain time step, setting a battery charge state estimation model, and calculating the charge state of each time point according to the equivalent available electric quantity; Setting a battery internal resistance estimation model, calculating the battery internal resistance of each time point according to the charge state, and calculating the maximum safe discharge power of each time point according to the battery internal resistance; And acquiring the real maximum discharge power of each time point, and comparing the real maximum discharge power with the corresponding maximum safe discharge power, so as to determine whether the corresponding time point and the real maximum discharge power are abnormal.
2. The method for testing the power retention performance of a hybrid electric vehicle in a plateau environment as recited in claim 2, wherein calculating the equivalent available power of the vehicle in the plateau environment comprises: , Wherein, the For the equivalent available power of the vehicle in the highland environment, For the rated power of the electric power meter, For the first weight of altitude, In order to be at the altitude of the sea, For the reference height to be used, For a first adjustment factor of altitude, As a first weight of the temperature, In order to be at the temperature of the environment, As a reference to the temperature of the liquid, As a weight for the degree of degradation of the battery, Dividing the battery charge cycle times by the design charge cycle times to obtain the battery aging degree, Is an adjustment factor for the degree of battery aging.
3. The method for testing the power retention performance of a hybrid electric vehicle in a plateau environment according to claim 2, wherein the battery state-of-charge estimation model comprises: , Wherein, the Is the first The state of charge at a point in time, Is the first The state of charge at a point in time, In order to be able to determine the number of time slices, Is the first The energy recovery efficiency at each point in time, Is the first The energy recovery power at a point in time, Is the first The discharge power at a point in time is, Is the first The discharge efficiency at the time point is set to be high, In time steps.
4. The method for testing the power retention performance of a hybrid electric vehicle in a plateau environment as claimed in claim 3, wherein said internal resistance estimation model of the battery comprises: , Wherein, the Is the first The internal resistance of the battery at a point in time, For the reference internal resistance, For the second weight of altitude, As a second adjustment factor for altitude, As a second weight of the temperature, Is the first The temperature of the battery at a point in time, As a constant of the decay of temperature, As a weight of the state of charge, Is the adjustment factor for the state of charge.
5. The method for testing the power retention performance of a hybrid vehicle in a plateau environment as recited in claim 4, wherein calculating the maximum safe discharge power for each time point includes: , Wherein, the Is the first Maximum safe discharge power at a point in time, In the first place No-load voltage at the charge state at a point in time, For the maximum amplitude of the drop allowed by the terminal voltage, Is a battery power safety limit.
6. The method for testing the power conservation performance of the hybrid electric vehicle in the plateau environment according to claim 1, wherein determining whether the corresponding time point and the true maximum discharge power are abnormal comprises marking the corresponding time point as an abnormal time point and marking the corresponding true maximum discharge power as abnormal discharge if the true maximum discharge power exceeds the maximum safe discharge power.
7. The utility model provides a hybrid vehicle electric quantity keeps capability test system under altitude environment which characterized in that includes: the module is used for calculating the equivalent available electric quantity, which is used for acquiring environmental information, the battery aging degree of the hybrid electric vehicle and the rated electric quantity of the hybrid electric vehicle, and calculating the equivalent available electric quantity of the vehicle in a plateau environment, wherein the environmental information comprises altitude and environmental temperature; The charge state calculating module is used for dividing the driving period of the hybrid electric vehicle into a plurality of time slices according to a certain time step, setting a battery charge state estimation model and calculating the charge state of each time point according to the equivalent available electric quantity; the maximum safe discharge power calculating module is used for setting a battery internal resistance estimating model, calculating the battery internal resistance of each time point according to the charge state, and calculating the maximum safe discharge power of each time point according to the battery internal resistance; The abnormality judgment module is used for acquiring the real maximum discharge power of each time point, comparing the real maximum discharge power with the corresponding maximum safe discharge power, and determining whether the corresponding time point and the real maximum discharge power are abnormal or not.
8. The system for testing the power conservation performance of a hybrid vehicle in a plateau environment as recited in claim 7, wherein calculating the equivalent available power of the vehicle in the plateau environment comprises: , Wherein, the For the equivalent available power of the vehicle in the highland environment, For the rated power of the electric power meter, For the first weight of altitude, In order to be at the altitude of the sea, For the reference height to be used, For a first adjustment factor of altitude, As a first weight of the temperature, In order to be at the temperature of the environment, As a reference to the temperature of the liquid, As a weight for the degree of degradation of the battery, Dividing the battery charge cycle times by the design charge cycle times to obtain the battery aging degree, Is an adjustment factor for the degree of battery aging.
9. The system for testing the power retention performance of a hybrid vehicle in a plateau environment as recited in claim 8, wherein said battery state of charge estimation model includes: , Wherein, the Is the first The state of charge at a point in time, Is the first The state of charge at a point in time, In order to be able to determine the number of time slices, Is the first The energy recovery efficiency at each point in time, Is the first The energy recovery power at a point in time, Is the first The discharge power at a point in time is, Is the first The discharge efficiency at the time point is set to be high, In time steps.
10. The system for testing the power retention performance of a hybrid vehicle in a plateau environment as recited in claim 9, wherein the internal resistance estimation model of the battery includes: , Wherein, the Is the first The internal resistance of the battery at a point in time, For the reference internal resistance, For the second weight of altitude, As a second adjustment factor for altitude, As a second weight of the temperature, Is the first The temperature of the battery at a point in time, As a constant of the decay of temperature, As a weight of the state of charge, Is the adjustment factor for the state of charge.

Description

Method and system for testing electric quantity retention performance of hybrid electric vehicle in plateau environment Technical Field The invention belongs to the technical field of electric quantity retention performance test of hybrid electric vehicles, and particularly relates to a method and a system for testing the electric quantity retention performance of a hybrid electric vehicle in a plateau environment. Background In the prior art, the test of the electric quantity maintaining performance of the hybrid electric vehicle is mainly carried out in a plain normal temperature and normal pressure environment, and whether the test is a bench test or a road circulation working condition test, the test method of the electric quantity maintaining performance of the battery under a certain fixed SOC initial value is mainly evaluated by only relying on a preset power circulation curve. Such methods generally assume that the output power capability and charge-discharge efficiency of the battery are constant, independent of environmental factors (e.g., altitude, temperature, barometric pressure, air density, etc.), and do not consider the significant impact of the unique low barometric pressure, low temperature, and lean air in the plateau region on the heat dissipation capability, cooling efficiency, and electrochemical reaction kinetics of the battery thermal management system. In particular, in a plateau environment, the air density is obviously reduced, the heat of a battery is difficult to effectively dissipate, the temperature of the battery is accelerated, the current test method lacks a constraint model for considering the power attenuation caused by heat accumulation, meanwhile, the low-temperature environment can cause the increase of the viscosity of electrolyte, the reduction of the diffusion rate of lithium ions and the aggravation of polarization, so that the internal resistance of the battery is rapidly increased, and the dischargeable power is obviously reduced, but a fixed rated internal resistance or normal-temperature efficiency parameter is generally used in the current test system, and the real characteristic that the reduction rate of the SOC changes along with the change of the temperature and the altitude cannot be reflected. In summary, the prior art lacks a unified mathematical modeling and testing method capable of comprehensively considering the dual influences of altitude, temperature and SOC on the internal resistance and the thermal power limit of the battery, so that the test result cannot accurately predict the real maintenance capability of the vehicle SOC under the complex working condition of the altitude, and the applicability and the safety of the control strategy of the hybrid power system in the altitude area are limited. Disclosure of Invention In order to solve the technical problems, the invention provides a method for testing the electric quantity retention performance of a hybrid electric vehicle in a plateau environment, which comprises the following steps: Acquiring environment information, battery aging degree of a hybrid electric vehicle and rated electric quantity of the hybrid electric vehicle, and calculating equivalent available electric quantity of the vehicle in a plateau environment, wherein the environment information comprises altitude and environment temperature; Dividing the driving period of the hybrid electric vehicle into a plurality of time slices according to a certain time step, setting a battery charge state estimation model, and calculating the charge state of each time point according to the equivalent available electric quantity; Setting a battery internal resistance estimation model, calculating the battery internal resistance of each time point according to the charge state, and calculating the maximum safe discharge power of each time point according to the battery internal resistance; And acquiring the real maximum discharge power of each time point, and comparing the real maximum discharge power with the corresponding maximum safe discharge power, so as to determine whether the corresponding time point and the real maximum discharge power are abnormal. Further, calculating an equivalent available power of the vehicle in the plateau environment includes: , Wherein, the For the equivalent available power of the vehicle in the highland environment,For the rated power of the electric power meter,For the first weight of altitude,In order to be at the altitude of the sea,For the reference height to be used,For a first adjustment factor of altitude,As a first weight of the temperature,In order to be at the temperature of the environment,As a reference to the temperature of the liquid,As a weight for the degree of degradation of the battery,Dividing the battery charge cycle times by the design charge cycle times to obtain the battery aging degree,Is an adjustment factor for the degree of battery aging. Further, the battery state of charge esti