Method and system for testing road driving endurance and energy consumption of electric vehicle

Abstract

The invention discloses an electric vehicle road driving endurance and energy consumption test method and system, and the method comprises the steps: determining a mechanical energy transmission path of a vehicle according to a vehicle mechanical structure and a bus signal, determining a vehicle signal test point based on the mechanical energy transmission path, and carrying out the energy test and analysis of a whole vehicle based on the vehicle signal test point. Calculating the full-charge endurance mileage of the vehicle, and calculating the energy consumption of the vehicle according to the full-charge endurance mileage and the energy measurement value. According to the invention, vehicle configuration, bus signal analysis and key component sensor installation are carried out through energy flow analysis, energy flow analysis is carried out on a high-voltage system, a low-voltage accessory system, a mechanical system and the like of a vehicle, related tests are carried out through energy flow, performance indexes of whole vehicle driving energy consumption and charging efficiency are quantified, and the energy flow analysis precision is improved. And performance development is optimized through a test result, technical support is provided for vehicle performance development work, and the method is simple and efficient and can be used for vehicles with the same structure.

Description

Technical Field

[0001] The present invention belongs to the technical field of vehicle testing, and particularly relates to a method and system for testing the road driving endurance and energy consumption of electric vehicles. Background Art

[0002] With the rapid development of new energy vehicles, the issue of the full-charge driving range achievement rate of electric vehicles has gradually attracted attention. CLTC (China Light Vehicle Test Cycle) is the core standard for current driving range testing. It calculates the energy consumption by simulating specific driving scenarios (such as average vehicle speed, acceleration and deceleration frequencies, etc.), and then obtains the theoretical full-charge driving range. However, there are differences between the CLTC driving conditions and actual user driving habits (such as vehicle speed fluctuations, strong accelerations, etc.), resulting in a certain deviation between the theoretical value and the actual driving range achievement rate. Road driving range testing is an important testing method for analyzing the energy consumption of new energy vehicles and the achievement rate of the full-charge driving range. Through energy flow analysis, the distribution of the vehicle's power consumption can be comprehensively understood, the energy consumption difference between the sample vehicle and the CLTC driving condition test can be quantitatively found, and the impact of the actual driving range and power consumption of the user's actual driving vehicle can be predicted. The calculation of the full-charge driving range of the whole vehicle is the mileage of the electric vehicle driving from the highest charge state of the power battery to the lowest charge state of the power battery, and the electric energy obtained from the national grid when charging from the lowest charge state of the battery to the highest charge state after driving ends. The value obtained by dividing this electric energy by the mileage is the vehicle's energy consumption rate. However, the current driving range and energy consumption testing methods rely on a complex vehicle sensor architecture for data collection and calculation, the testing equipment and processes are costly, it is difficult to cover diverse user driving scenarios, lack universality, and there is a certain deviation between the theoretical driving range and the actual achievement rate, and the accuracy of the testing can lead to misunderstandings of consumers about the product performance. Summary of the Invention

[0003] To solve the above problems, the present invention provides a method and system for testing the road driving endurance and energy consumption of electric vehicles, so as to solve the problems that the current driving range and energy consumption testing methods rely on a complex vehicle sensor architecture for data collection and calculation, the testing equipment and processes are costly, it is difficult to cover diverse user driving scenarios, lack universality, and there is a certain deviation between the theoretical driving range and the actual achievement rate, and the testing accuracy is relatively low.

[0004] A method for testing the road driving endurance and energy consumption of an electric vehicle includes:

[0005] Determine the mechanical energy transfer path of the vehicle according to the vehicle's mechanical structure and bus signals;

[0006] Determine the vehicle signal test points based on the mechanical energy transfer path;

[0007] Perform energy testing and analysis on the whole vehicle based on vehicle signal test points to obtain energy measurement values;

[0008] Calculate the full-charge driving range of the vehicle, and calculate the energy consumption of the vehicle based on the full-charge driving range and the energy measurement values.

[0009] According to a specific embodiment of the present invention, determining the mechanical energy transfer path of the vehicle based on the vehicle mechanical structure and bus signals includes:

[0010] Analyze the high-voltage system, low-voltage system, and mechanical system of the vehicle respectively according to the connection method of the vehicle mechanical structure and the bus signals, and determine the mechanical energy transfer path of the vehicle.

[0011] According to a specific embodiment of the present invention, determining the vehicle signal test points based on the mechanical energy transfer path includes:

[0012] Select key components of the vehicle based on the mechanical energy transfer path to set signal test points, and install data acquisition devices at the signal test points, where the signal test points include the input end of the power battery, the output end of the power battery, the input end of the motor controller, the output end of the motor controller, the input end of the charger, and the output end of the charger.

[0013] According to a specific embodiment of the present invention, performing energy testing and analysis on the whole vehicle based on vehicle signal test points to obtain energy measurement values includes:

[0014] Use a power analyzer to sample the current and voltage signals at each vehicle signal test point, and respectively obtain the current values and voltage values at the vehicle signal test points during the vehicle charging process and the vehicle discharging process, where the vehicle charging process is the process of charging the battery from the lowest charge state to the highest charge state, and the vehicle discharging process is the process of discharging the battery from the highest charge state to the lowest charge state.

[0015] According to a specific embodiment of the present invention, calculating the full-charge driving range of the vehicle, and calculating the energy consumption of the vehicle based on the full-charge driving range and the energy measurement values includes:

[0016] Collect the vehicle speed data during the driving process of the vehicle from the highest charge state to the lowest charge state and perform integral calculation with time to obtain the full-charge driving range R of the vehicle;

[0017] Calculate the vehicle charging energy consumption η1 based on the power consumption C1 of the vehicle during the charging process and the full-charge driving range R, and its calculation formula is:

[0018] η1 = C1 / R

[0019] Calculate the vehicle driving energy consumption η2 based on the power consumption C2 of the vehicle during the driving process and the full-charge driving range R, and its calculation formula is:

[0020] η2 = C2 / R

[0021] Based on the low - voltage electrical power consumption E1 and the full - charge driving range R of the vehicle during driving, the low - voltage accessory energy consumption η3 of the vehicle is calculated, and its calculation formula is:

[0022] η3 = E1 / R

[0023] Based on the power consumption C1 of the vehicle during charging and the power consumption C2 of the vehicle during driving, the charging efficiency η4 of the vehicle is calculated, and its calculation formula is:

[0024] η4 = C1 / C2

[0025] Wherein, the driving process is the process of the battery discharging from the highest charge state to the lowest charge state, and the charging process is the process of the battery charging from the lowest charge state to the highest charge state.

[0026] According to a specific embodiment of the present invention, it further includes:

[0027] Comparing and analyzing the full - charge driving range and energy consumption of the vehicle with the standard working conditions, and optimizing the performance indexes of the vehicle driving energy consumption and charging efficiency according to the analysis results.

[0028] A test system for the driving range and energy consumption of an electric vehicle on the road, including:

[0029] An energy transfer path determination module, configured to determine the mechanical energy transfer path of the vehicle according to the vehicle mechanical structure and bus signals;

[0030] A signal test point determination module, configured to determine the vehicle signal test points based on the mechanical energy transfer path;

[0031] An energy test and analysis module, configured to perform energy test and analysis on the whole vehicle based on the vehicle signal test points to obtain energy measurement values;

[0032] A calculation module, configured to calculate the full - charge driving range of the vehicle, and calculate the energy consumption of the vehicle according to the full - charge driving range and the energy measurement values.

[0033] According to a specific embodiment of the present invention, the calculation module further includes:

[0034] A full - charge driving range calculation module, configured to collect the vehicle speed data during the driving process of the vehicle from the highest charge state to the lowest charge state and perform integral calculation with time to obtain the full - charge driving range of the vehicle;

[0035] An energy consumption calculation module, configured to calculate the energy consumption of the vehicle according to the full - charge driving range and the energy measurement values.

[0036] According to a specific embodiment of the present invention, the energy consumption calculation module further includes:

[0037] A vehicle charging energy consumption calculation module, which is used to calculate the vehicle charging energy consumption based on the power consumption of the vehicle during the charging process and the full charge driving range.

[0038] A vehicle driving energy consumption calculation module, which is used to calculate the vehicle driving energy consumption based on the power consumption of the vehicle during the driving process and the full charge driving range.

[0039] A vehicle low-voltage accessory energy consumption calculation module, which is used to calculate the vehicle low-voltage accessory energy consumption based on the power consumption of the low-voltage electrical appliances of the vehicle during the driving process and the full charge driving range.

[0040] A vehicle charging efficiency calculation module, which is used to calculate the vehicle charging efficiency based on the power consumption of the vehicle during the charging process and the power consumption of the vehicle during the driving process.

[0041] Wherein the driving process is the process of the battery discharging from the highest charge state to the lowest charge state, and the charging process is the process of the battery charging from the lowest charge state to the highest charge state.

[0042] According to a specific embodiment of the present invention, it further includes:

[0043] A performance evaluation module, which is used to compare and analyze the full charge driving range and energy consumption of the vehicle with the standard working conditions, and optimize the performance indicators of the vehicle driving energy consumption and charging efficiency according to the analysis results.

[0044] Compared with the prior art, a test method and system for the driving range and energy consumption of an electric vehicle provided by the present invention have the following advantages:

[0045] Based on the vehicle configuration analysis, bus signal parsing and installation of key component sensors by the vehicle overall energy flow analysis method, the present invention realizes the energy flow analysis of the vehicle high-voltage system, low-voltage accessory system, mechanical system, etc., conducts relevant tests through the energy flow, quantifies the performance indicators of the vehicle driving energy consumption and charging efficiency, and optimizes the performance development through the test results, providing technical support for the vehicle performance development work. This method is simple and efficient, and can be used for vehicles with the same structure. Description of the Drawings

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0047] Figure 1 It is a flowchart of a test method for the driving range and energy consumption of an electric vehicle provided by an embodiment of the present invention.

[0048] Figure 2 It is a flowchart of a method for calculating the full - charge driving range and energy consumption of a vehicle provided according to an embodiment of the present invention.

[0049] Figure 3 It is a schematic diagram of the mechanical energy transfer path of a vehicle provided according to an embodiment of the present invention.

[0050] Figure 4 It is a structural diagram of a test system for the driving range and energy consumption of an electric vehicle during road driving provided according to an embodiment of the present invention.

[0051] Figure 5 It is a structural diagram of a calculation module provided according to an embodiment of the present invention.

[0052] Figure 6 It is a structural diagram of an energy consumption calculation module provided according to an embodiment of the present invention.

[0053] Figure 7 It is a schematic diagram of the structure of a computer device provided according to an embodiment of the present invention.

[0054] Explanation of reference numerals:

[0055] 01 - Energy transmission path determination module; 02 - Signal test point determination module; 03 - Energy test and analysis module; 04 - Calculation module; 05 - Performance evaluation module;

[0056] 041 - Full - charge driving range calculation module; 042 - Energy consumption calculation module;

[0057] 0421 - Vehicle charging energy consumption calculation module; 0422 - Vehicle driving energy consumption calculation module; 0423 - Vehicle low - voltage accessory energy consumption calculation module; 0424 - Vehicle charging efficiency calculation module;

[0058] 101 - AC charging pile; 102 - Charger; 103 - High - voltage distribution box; 104 - Power battery; 105 - Low - voltage distribution box; 106 - Low - voltage accessory; 107 - Motor controller; 108 - Drive motor. Detailed implementation manners

[0059] In order to enable those skilled in the art to more clearly understand the concepts and ideas of the present invention, the present invention will be described in detail below in conjunction with specific embodiments. It should be understood that the embodiments given herein are only a part of all possible embodiments of the present invention. After reading the specification of this application, those skilled in the art are capable of making improvements, modifications, or replacements to part or all of the following embodiments, and these improvements, modifications, or replacements are also included within the scope of protection required by the present invention.

[0060] In this text, terms such as "advance notice", "entry into the station", and other similar words are not intended to imply any order, quantity, or importance, but are merely used to distinguish different components. In this text, terms such as "a", "an", and other similar words are not intended to mean that there is only one thing, but rather that the relevant description only refers to one of the things, and the thing may have one or more. In this text, terms such as "comprise", "include", and other similar words are intended to represent a logical relationship, and should not be regarded as representing a spatial structure relationship. For example, "A includes B" is intended to mean that logically B belongs to A, rather than meaning that B is located inside A spatially. Additionally, the meanings of terms such as "comprise", "include", and other similar words should be regarded as open-ended rather than closed. For example, "A includes B" is intended to mean that B belongs to A, but B does not necessarily constitute the whole of A, and A may also include other elements such as C, D, E, etc.

[0061] In this text, terms such as "embodiment", "the present embodiment", "an embodiment", "one embodiment" do not mean that the relevant description only applies to a specific embodiment, but rather that these descriptions may also apply to one or more other embodiments. Those skilled in the art should understand that in this text, any description made for a certain embodiment can be substituted, combined, or otherwise combined with the relevant descriptions in one or more other embodiments, and the new embodiments generated by substitution, combination, or other means are easily conceivable by those skilled in the art and fall within the protection scope of the present invention.

[0062] Embodiment 1

[0063] Additional aspects and advantages of the embodiments of the present invention will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the embodiments of the present invention. In combination with Figures 1-3 , the embodiments of the present invention provide a method for testing the driving range and energy consumption of an electric vehicle on the road, including:

[0064] S1: Determine the mechanical energy transfer path of the vehicle according to the vehicle's mechanical structure and bus signals.

[0065] S2: Determine the vehicle signal test points based on the mechanical energy transfer path.

[0066] S3: Conduct energy tests and analysis on the whole vehicle based on the vehicle signal test points to obtain energy measurement values.

[0067] S4: Calculate the full-charge driving range of the vehicle, and calculate the energy consumption of the vehicle according to the full-charge driving range and the energy measurement values.

[0068] S5: Compare and analyze the full charge driving range and energy consumption of the vehicle with the standard driving conditions, and optimize the performance indicators of the vehicle's driving energy consumption and charging efficiency according to the analysis results.

[0069] Through the vehicle energy flow analysis method, the present invention analyzes the vehicle configuration and bus signals, selects key components to set signal test points and installs sensors to collect voltage and current signals, which are used to carry out energy flow analysis on the vehicle's high-voltage system, low-voltage accessory system, mechanical system, etc., so as to realize the test of the vehicle's driving range and energy consumption, providing technical support for the vehicle performance development work.

[0070] Specifically, step S1 determines the mechanical energy transfer path of the vehicle according to the vehicle's mechanical structure and bus signals, including:

[0071] Analyze the vehicle's high-voltage system, low-voltage system and mechanical system respectively according to the connection mode of the vehicle's mechanical structure and bus signals, and determine the mechanical energy transfer path of the vehicle.

[0072] In a specific embodiment of the present invention, by analyzing the high-voltage system architecture, low-voltage system architecture and mechanical system architecture of the vehicle, the connection mode and layout form of each high-voltage component, low-voltage component and mechanical component can be obtained, and the mechanical energy transfer path of the vehicle is determined according to the connection mode of the vehicle's mechanical structure and bus signals. As Figure 3 shown, the high-voltage system components of the vehicle include a charger, a high-voltage distribution box, a power battery, a motor controller and a drive motor. The charger is a device mounted on an electric vehicle to convert low-voltage alternating current into high-voltage direct current. The high-voltage distribution box is a device mounted on an electric vehicle to distribute the vehicle's high-voltage current. The power battery is the end point of energy flow during the charging and discharging process of the vehicle. The low-voltage system components include a low-voltage distribution box and low-voltage accessories. The low-voltage distribution box is a device that converts and outputs low-voltage direct current. The low-voltage accessories include a large screen, an instrument panel, a motor water pump, a blower, an LV battery, a VCU (Vehicle Control Unit), a BMS (Bttery Management System), etc. In the mechanical energy transfer path of the vehicle, the charging pile is the starting point of energy flow, and the power battery is the end point of energy flow. The charging pile is the source of the vehicle's electrical energy acquisition, generally a 7.7kw AC charging pile.

[0073] Specifically, step S2 determines the vehicle signal test points based on the mechanical energy transfer path, including:

[0074] Based on the mechanical energy transfer path, select the key components of the vehicle to set signal test points, and install data acquisition devices at the signal test points. The signal test points include the input end of the power battery, the output end of the power battery, the input end of the motor controller, the output end of the motor controller, the input end of the charger and the output end of the charger.

[0075] In a specific embodiment of the present invention, signal test points are set at key components of the vehicle to install a data acquisition device for data acquisition, so as to obtain the power consumption of relevant components. According to the measured power consumption of each component, the cruising range and energy consumption of the whole vehicle can be calculated. The data acquisition device includes a voltage sensor, a current sensor, a CAN bus recorder, an AC / DC charging pile, etc. In a specific embodiment of the present invention, signal test points are respectively set at the input end of the power battery, the output end of the power battery, the input end of the motor controller, the output end of the motor controller, the input end of the charger, and the output end of the charger. Voltage, current sensors and a CAN bus recorder are installed at each signal test point to collect the voltage value and current value of each signal test point. As Figure 3 shown, a signal test point A is set at the input end of the charger, and a current and voltage acquisition device is installed at this test point to collect the voltage value and current value of this test point during the process of charging the battery from the lowest charge state to the highest charge state. The energy entering the whole vehicle can be obtained through integral calculation. For another example, a signal test point C is set at the input end of the power battery, and voltage and current sensors are installed. The current value and voltage value during the process of discharging the battery from the highest charge state to the lowest charge state are collected at this test point. The energy entering the battery can be obtained through integral calculation. For another example, a signal test point E is set at the output end of the charger, and a CAN bus recorder and voltage and current sensors are installed at this test point to collect the voltage value and current value during the process of discharging the battery from the highest charge state to the lowest charge state. The power consumption of low-voltage accessories can be obtained through integral calculation. The power consumption of low-voltage accessories is the power consumption and loss of low-voltage electrical appliances during AC charging and driving of the whole vehicle, which is recorded as the loss value in the whole vehicle test. By integrating and calculating the measured voltage and current, the power consumption of relevant components can be obtained.

[0076] Specifically, step S3 performs energy test and analysis on the whole vehicle based on the vehicle signal test points, and the obtained energy measurement values include:

[0077] The current and voltage signals of each vehicle signal test point are sampled by a power analyzer to obtain the current value and voltage value of the vehicle signal test point during the vehicle charging process and the vehicle discharging process respectively. The vehicle charging process is the process of charging the battery from the lowest charge state to the highest charge state, and the vehicle discharging process is the process of discharging the battery from the highest charge state to the lowest charge state.

[0078] The present invention samples the current and voltage signals at each vehicle signal test point through a power analyzer for energy flow testing at the vehicle's signal test points and charging piles, and calculates the vehicle's cruising range and energy consumption based on the measured values. The full charge cruising range of a vehicle refers to the mileage of an electric vehicle from the highest charge state of the power battery to the lowest charge state. Therefore, when calculating the full charge cruising range of the vehicle, it is necessary to collect the voltage and current values at the vehicle signal test points during the process of the battery discharging from the highest charge state to the lowest charge state. After the driving ends, the vehicle obtains electric energy from the charging pile for charging, and the battery charges from the lowest charge state to the highest charge state. To calculate the power consumption of the vehicle during the charging process, it is necessary to collect the voltage and current values at the output end of the charging pile. The value obtained by dividing this electric energy by the mileage is the vehicle's energy consumption rate. During actual driving, the energy flow distribution determines the amount of cruising range with the same battery charge, thereby affecting the vehicle's energy consumption rate.

[0079] Specifically, step S4 for calculating the full charge cruising range of the vehicle and calculating the vehicle's energy consumption based on the full charge cruising range and energy measurement values includes:

[0080] S41: Collect the vehicle speed data during the driving process of the vehicle from the highest charge state to the lowest charge state and perform integral calculation with time to obtain the full charge cruising range R of the vehicle.

[0081] S42: Calculate the vehicle charging energy consumption η1 based on the power consumption C1 of the vehicle during the charging process and the full charge cruising range R. The calculation formula is:

[0082] η1 = C1 / R (1)

[0083] S43: Calculate the vehicle driving energy consumption η2 based on the power consumption C2 of the vehicle during the driving process and the full charge cruising range R. The calculation formula is:

[0084] η2 = C2 / R (2)

[0085] S44: Calculate the vehicle low-voltage accessory energy consumption η3 based on the power consumption E1 of the low-voltage electrical appliances of the vehicle during the driving process and the full charge cruising range R. The calculation formula is:

[0086] η3 = E1 / R (3)

[0087] S45: Calculate the vehicle charging efficiency η4 based on the power consumption C1 of the vehicle during the charging process and the power consumption C2 of the vehicle during the driving process. The calculation formula is:

[0088] η4 = C1 / C2 (4)

[0089] The driving process is the process of the battery discharging from the highest charge state to the lowest charge state, and the charging process is the process of the battery charging from the lowest charge state to the highest charge state.

[0090] In a specific embodiment of the present invention, first, a satellite positioning data acquisition device is used to collect the vehicle speed data of the vehicle during the driving process, and the collected vehicle speed data is integrated with time to obtain the full charge driving range R of the vehicle. The driving process of the vehicle refers to the process of the battery discharging from the highest charge state to the lowest charge state. Then, a power analyzer is used to collect the voltage measurement value and current measurement value of the vehicle's whole vehicle signal test point during the driving process of the vehicle, that is, the voltage value and current value of the battery discharging from the highest charge state to the lowest charge state during the driving process of the vehicle, and an integration calculation is performed based on the current measurement value and the voltage measurement value to obtain the power consumption C2 of the vehicle during the driving process. According to formula (2), a division operation is performed on the power consumption C2 of the vehicle during the driving process and the full charge driving range R to obtain the vehicle driving energy consumption η2, Wh / 100km. In addition, by collecting the current measurement value and voltage measurement value of the bus signal during the driving process of the vehicle, that is, collecting the voltage value and current value of the CAN bus of the battery discharging from the highest charge state to the lowest charge state during the driving process of the vehicle, and an integration calculation is performed based on the current measurement value and the voltage measurement value to obtain the power consumption E1 of the low-voltage electrical appliances during the driving process of the vehicle. A division operation is performed on the power consumption E1 of the low-voltage electrical appliances and the full charge driving range R to obtain the vehicle low-voltage accessory energy consumption η3, Wh / 100km. After the battery discharges from the highest charge state to the lowest charge state, it is charged through a charging pile. At this time, the voltage measurement value and current measurement value of the vehicle during the charging process are collected at the output end of the charging pile, that is, the voltage measurement value and current measurement value during the process of the battery charging from the lowest charge state to the highest charge state during the charging process of the vehicle, and an integration calculation is performed based on the current measurement value and the voltage measurement value to obtain the power consumption C1 of the vehicle during the charging process. According to formula (1), a division operation is performed on the power consumption C1 of the vehicle during the charging process and the full charge driving range R to obtain the vehicle charging energy consumption η1, Wh / 100km. Finally, according to formula (4), a division operation is performed on the power consumption C1 of the vehicle during the charging process and the power consumption C2 of the vehicle during the driving process to obtain the vehicle charging efficiency η4, Wh / 100km.

[0091] Through the quantitative analysis of the above performance indicators of the whole vehicle driving energy consumption and charging efficiency, comparing with the standard working conditions in the vehicle model development process, the differences of the vehicle model under the user working conditions are evaluated, and the performance development is optimized through the test results.

[0092] Embodiment 2

[0093] Based on the above method, the embodiment of the present invention also provides a test system for the driving range and energy consumption of an electric vehicle on the road, as Figures 4-6As shown, it includes:

[0094] An energy transfer path determination module 01, configured to determine the mechanical energy transfer path of the vehicle according to the vehicle mechanical structure and bus signals.

[0095] A signal test point determination module 02, configured to determine the vehicle signal test points based on the mechanical energy transfer path.

[0096] An energy test and analysis module 03, configured to perform energy test and analysis on the whole vehicle based on the vehicle signal test points to obtain energy measurement values.

[0097] A calculation module 04, configured to calculate the full-charge driving range of the vehicle and calculate the energy consumption of the vehicle according to the full-charge driving range and the energy measurement values.

[0098] A performance evaluation module 05, configured to compare and analyze the full-charge driving range and energy consumption of the vehicle with standard working conditions, and optimize the performance indicators of the driving energy consumption and charging efficiency of the whole vehicle according to the analysis results.

[0099] The present invention analyzes the vehicle configuration and bus signals, selects key components to set signal test points and installs sensors to collect voltage and current signals, for carrying out energy flow analysis on the vehicle high-voltage system, low-voltage accessory system, mechanical system, etc., and then realizes the test of the driving range and energy consumption of the whole vehicle, providing technical support for the vehicle performance development work.

[0100] Specifically, the present invention analyzes the high-voltage system, low-voltage system and mechanical system of the vehicle through the energy transfer path determination module 01, and determines the mechanical energy transfer path of the vehicle.

[0101] In a specific embodiment of the present invention, by analyzing the high-voltage system architecture, low-voltage system architecture and mechanical system architecture of the vehicle, the connection methods and layout forms of each high-voltage component, low-voltage component and mechanical component can be obtained, and the mechanical energy transfer path of the vehicle is determined according to the connection method of the vehicle mechanical structure and the bus signals. For example Figure 3As shown in the figure, the high-voltage system components of the vehicle include a charger, a high-voltage distribution box, a power battery, a motor controller, and a drive motor. The charger is a device installed on an electric vehicle that converts low-voltage alternating current into high-voltage direct current. The high-voltage distribution box is a device installed on an electric vehicle that distributes the vehicle's high-voltage current. The power battery is the end point of energy flow during the charging and discharging process of the vehicle. The low-voltage system components include a low-voltage distribution box and low-voltage accessories. The low-voltage distribution box is a device that converts and outputs low-voltage direct current. The low-voltage accessories include a large screen, an instrument panel, a motor water pump, a blower, an LV battery, a VCU (Vehicle Control Unit), a BMS (Bttery Management System), etc. In the mechanical energy transfer path of the vehicle, the charging pile is the starting point of energy flow, and the power battery is the end point of energy flow. The charging pile is the source of the vehicle's electrical energy acquisition, usually a 7.7kw AC charging pile.

[0102] Specifically, the signal test point determination module 02 of the present invention selects key components of the vehicle to set signal test points and installs data acquisition devices at the signal test points. The signal test points include the input end of the power battery, the output end of the power battery, the input end of the motor controller, the output end of the motor controller, the input end of the charger, and the output end of the charger.

[0103] In a specific embodiment of the present invention, by selecting key components of the vehicle to set signal test points, data acquisition devices can be installed for data acquisition, and then the power consumption of relevant components can be obtained. The cruising range and energy consumption of the vehicle can be calculated based on the measured power consumption of each component. The data acquisition devices include voltage sensors, current sensors, CAN bus recorders, AC / DC charging piles, etc. In a specific embodiment of the present invention, signal test points are respectively set at the input end of the power battery, the output end of the power battery, the input end of the motor controller, the output end of the motor controller, the input end of the charger, and the output end of the charger, and voltage, current sensors, and CAN bus recorders are installed at each signal test point to collect the voltage values and current values of each signal test point, such as Figure 3As shown in the figure, a signal test point A is set at the input end of the charger, and a current and voltage acquisition device is installed at this test point to collect the voltage value and current value at this test point during the process of charging the battery from the lowest charge state to the highest charge state. Through integral calculation, the energy entering the vehicle can be obtained. For another example, a signal test point C is set at the input end of the power battery, and a voltage and current sensor are installed. The current value and voltage value during the process of discharging the battery from the highest charge state to the lowest charge state are collected at this test point. Through integral calculation, the energy entering the battery can be obtained. For another example, a signal test point E is set at the output end of the charger, and a CAN bus recorder and voltage and current sensors are installed at this test point to collect the voltage value and current value during the process of discharging the battery from the highest charge state to the lowest charge state at this test point. Through integral calculation, the power consumption of the low-voltage accessories can be obtained. The power consumption of the low-voltage accessories is the power consumption and loss of the low-voltage electrical appliances during the AC charging and driving of the vehicle, and is recorded as the loss value during the vehicle test. By integrating and calculating the measured voltage and current, the power consumption of relevant components can be obtained.

[0104] Specifically, the present invention samples the current and voltage signals at each vehicle signal test point through the energy test and analysis module 03, and respectively obtains the current value and voltage value at the vehicle signal test point during the vehicle charging process and the vehicle discharging process. The vehicle charging process is the process of charging the battery from the lowest charge state to the highest charge state, and the vehicle discharging process is the process of discharging the battery from the highest charge state to the lowest charge state.

[0105] The present invention samples the current and voltage signals at each vehicle signal test point in order to perform energy flow tests at the signal test points of the whole vehicle and the charging pile, and calculates the cruising range and energy consumption of the whole vehicle according to the measured values. The full-charge cruising range of the whole vehicle refers to the mileage of the electric vehicle from the highest charge state of the power battery to the lowest charge state of the power battery. Therefore, when calculating the full-charge cruising range of the whole vehicle, it is necessary to collect the voltage and current values at the vehicle signal test point during the process of discharging the battery from the highest charge state to the lowest charge state. After the driving is over, the vehicle obtains electric energy from the charging pile for charging, and the battery is charged from the lowest charge state to the highest charge state of the battery. In order to calculate the power consumption of the vehicle during the charging process, it is necessary to collect the voltage and current values at the output end of the charging pile. The value obtained by dividing this electric energy by the mileage is the energy consumption rate of the whole vehicle. During the actual driving process, the energy flow distribution determines the amount of the cruising range with the same battery power, and thus affects the energy consumption rate of the whole vehicle.

[0106] Specifically, the calculation module 04 further includes:

[0107] A full-charge cruising range calculation module 041, which is used to collect the vehicle speed data during the driving process of the vehicle from the highest charge state to the lowest charge state and perform integral calculation with time to obtain the full-charge cruising range of the vehicle.

[0108] An energy consumption calculation module 042, configured to calculate the energy consumption of the vehicle according to the full-charge cruising range and the energy measurement value.

[0109] Furthermore, the energy consumption calculation module 042 further includes:

[0110] A vehicle charging energy consumption calculation module 0421, configured to calculate the vehicle charging energy consumption based on the power consumption of the vehicle during the charging process and the full-charge cruising range.

[0111] A vehicle driving energy consumption calculation module 0422, configured to calculate the vehicle driving energy consumption based on the power consumption of the vehicle during the driving process and the full-charge cruising range.

[0112] A vehicle low-voltage accessory energy consumption calculation module 0423, configured to calculate the vehicle low-voltage accessory energy consumption based on the power consumption of the vehicle low-voltage electrical appliances during the driving process and the full-charge cruising range.

[0113] A vehicle charging efficiency calculation module 0424, configured to calculate the vehicle charging efficiency based on the power consumption of the vehicle during the charging process and the power consumption of the vehicle during the driving process.

[0114] Wherein the driving process is the process of the battery discharging from the highest charge state to the lowest charge state, and the charging process is the process of the battery charging from the lowest charge state to the highest charge state.

[0115] In a specific embodiment of the present invention, first, the full-charge driving range calculation module 041 collects the vehicle speed data during the vehicle's driving process, and integrates the collected vehicle speed data with time to obtain the full-charge driving range R of the vehicle, where the vehicle's driving process refers to the process of the battery discharging from the highest charge state to the lowest charge state. Then, the vehicle driving energy consumption calculation module 0422 collects the voltage measurement value and current measurement value of the vehicle's whole vehicle signal test point during the vehicle's driving process, that is, the voltage value and current value of the battery discharging from the highest charge state to the lowest charge state during the vehicle's driving process, and performs integral calculation based on the current measurement value and voltage measurement value to obtain the power consumption C2 of the vehicle during the driving process. By dividing the power consumption C2 of the vehicle during the driving process by the full-charge driving range R, the vehicle driving energy consumption η2, Wh / 100km can be obtained. In addition, the vehicle low-voltage accessory energy consumption calculation module 0423 collects the current measurement value and voltage measurement value of the vehicle's bus signal during the vehicle's driving process, that is, the voltage value and current value of the CAN bus of the battery discharging from the highest charge state to the lowest charge state during the vehicle's driving process, and performs integral calculation based on the current measurement value and voltage measurement value to obtain the power consumption E1 of the vehicle's low-voltage electrical appliances during the driving process. By dividing the power consumption E1 of the low-voltage electrical appliances by the full-charge driving range R, the vehicle low-voltage accessory energy consumption η3, Wh / 100km can be obtained. After the battery discharges from the highest charge state to the lowest charge state, it is charged through a charging pile. At this time, the vehicle charging energy consumption calculation module 0421 collects the voltage measurement value and current measurement value of the vehicle during the charging process, that is, the voltage measurement value and current measurement value during the process of the battery charging from the lowest charge state to the highest charge state during the vehicle's charging process, and performs integral calculation based on the current measurement value and voltage measurement value to obtain the power consumption C1 of the vehicle during the charging process. By dividing the power consumption C1 of the vehicle during the charging process by the full-charge driving range R, the vehicle charging energy consumption η1, Wh / 100km can be obtained. Finally, the vehicle charging efficiency calculation module 0424 divides the power consumption C1 of the vehicle during the charging process by the power consumption C2 of the vehicle during the driving process to obtain the vehicle charging efficiency η4, Wh / 100km.

[0116] Embodiment 3

[0117] As Figure 7 shown, an embodiment of the present invention further provides an electronic device, including: a processor and a memory. A computer program is stored in the memory, and the computer program is loaded and executed by the processor to implement the above-mentioned test method for the driving range and energy consumption of an electric vehicle on the road. The device in the present invention can be a server, a PC, a PAD, a mobile phone, etc.

[0118] Further, an embodiment of the present invention also provides a computer-readable storage medium, in which a computer program is stored, and the computer program is loaded and executed by a processor to implement the above-mentioned test method for the driving range and energy consumption of an electric vehicle on the road.

[0119] In summary, a test method and system for the driving range and energy consumption of an electric vehicle provided by the present invention have the following advantages:

[0120] Based on the vehicle integrated energy flow analysis method, the present invention analyzes the vehicle configuration, parses the bus signals, and installs sensors on key components, so as to conduct energy flow analysis on the vehicle's high-voltage system, low-voltage accessory system, mechanical system, etc. Relevant tests are carried out through the energy flow, the performance indicators of the vehicle's driving energy consumption and charging efficiency are quantified, and the performance development is optimized through the test results, providing technical support for the vehicle performance development work. This method is simple and efficient, and can be used for vehicles with the same structure.

[0121] The concept, principle, and idea of the present invention have been described in detail above in combination with specific implementation manners (including embodiments and examples). Those skilled in the art should understand that the embodiments of the present invention are not limited to the several forms given above. After reading this application document, those skilled in the art can make any possible improvements, substitutions, and equivalent forms to the steps, methods, systems, and components in the above embodiments. These improvements, substitutions, and equivalent forms should be regarded as falling within the scope of the present invention, and the protection scope of the present invention is only subject to the claims.

Claims

1. A test method for the driving range and energy consumption of an electric vehicle on the road, characterized in that, including: determining the mechanical energy transfer path of the vehicle according to the vehicle's mechanical structure and bus signals; determining vehicle signal test points based on the mechanical energy transfer path; performing energy tests and analyses on the entire vehicle based on the vehicle signal test points to obtain energy measurement values; calculating the full-charge driving range of the vehicle and calculating the energy consumption of the vehicle according to the full-charge driving range and the energy measurement values.

2. The test method for the driving range and energy consumption of an electric vehicle on the road according to claim 1, characterized in that The determining the mechanical energy transfer path of the vehicle according to the vehicle's mechanical structure and bus signals includes: analyzing the high-voltage system, low-voltage system, and mechanical system of the vehicle respectively according to the connection mode of the vehicle's mechanical structure and bus signals, and determining the mechanical energy transfer path of the vehicle.

3. The test method for the driving range and energy consumption of an electric vehicle on the road according to claim 1, wherein The determining vehicle signal test points based on the mechanical energy transfer path includes: selecting key components of the vehicle based on the mechanical energy transfer path to set signal test points, and installing data acquisition devices at the signal test points, where the signal test points include the input end of the power battery, the output end of the power battery, the input end of the motor controller, the output end of the motor controller, the input end of the charger, and the output end of the charger.

4. The test method for the driving range and energy consumption of an electric vehicle on the road according to claim 1, characterized in that, The performing energy tests and analyses on the entire vehicle based on the vehicle signal test points to obtain energy measurement values includes: using a power analyzer to sample the current and voltage signals at each of the vehicle signal test points to obtain the current values and voltage values at the vehicle signal test points during the vehicle charging process and the vehicle discharging process respectively, where the vehicle charging process is the process of charging the battery from the lowest charge state to the highest charge state, and the vehicle discharging process is the process of discharging the battery from the highest charge state to the lowest charge state.

5. The test method for the driving range and energy consumption of an electric vehicle on the road according to claim 4, characterized in that, The calculating the full-charge driving range of the vehicle and calculating the energy consumption of the vehicle according to the full-charge driving range and the energy measurement values includes: collecting the vehicle speed data during the driving process of the vehicle from the highest charge state to the lowest charge state and performing integral calculation with time to obtain the full-charge driving range R of the vehicle; calculating the vehicle charging energy consumption η1 based on the power consumption C1 of the vehicle during the charging process and the full-charge driving range R, and its calculation formula is: η1 = C1 / R calculating the vehicle driving energy consumption η2 based on the power consumption C2 of the vehicle during the driving process and the full-charge driving range R, and its calculation formula is: η2 = C2 / R calculating the vehicle low-voltage accessory energy consumption η3 based on the low-voltage electrical power consumption E1 of the vehicle during the driving process and the full-charge driving range R, and its calculation formula is: η3 = E1 / R calculating the vehicle charging efficiency η4 based on the power consumption C1 of the vehicle during the charging process and the power consumption C2 of the vehicle during the driving process, and its calculation formula is: η4 = C1 / C2 where the driving process is the process of discharging the battery from the highest charge state to the lowest charge state, and the charging process is the process of charging the battery from the lowest charge state to the highest charge state.

6. The test method for the driving range and energy consumption of an electric vehicle on the road according to claim 1, characterized in that, It further includes: comparing and analyzing the full-charge driving range and energy consumption of the vehicle with the standard working conditions, and optimizing the performance indicators of the vehicle driving energy consumption and charging efficiency according to the analysis results.

7. A test system for the driving range and energy consumption of an electric vehicle on the road, characterized in that, including: an energy transfer path determination module for determining the mechanical energy transfer path of the vehicle according to the vehicle's mechanical structure and bus signals; A signal test point determination module, which is used to determine vehicle signal test points based on the mechanical energy transfer path; An energy test and analysis module, which is used to conduct energy test and analysis on the whole vehicle based on the vehicle signal test points to obtain energy measurement values; A calculation module, which is used to calculate the full charge driving range of the vehicle and calculate the energy consumption of the vehicle according to the full charge driving range and the energy measurement values.

8. The test system for the cruising range and energy consumption of an electric vehicle during road driving according to claim 7, characterized in that, The calculation module further includes: A full charge driving range calculation module, which is used to collect vehicle speed data during the driving process of the vehicle from the highest charge state to the lowest charge state and perform integral calculation with time to obtain the full charge driving range of the vehicle; An energy consumption calculation module, which is used to calculate the energy consumption of the vehicle according to the full charge driving range and the energy measurement values.

9. The test system for the driving range and energy consumption of an electric vehicle on the road according to claim 8, characterized in that, The energy consumption calculation module further includes: A vehicle charging energy consumption calculation module, which is used to calculate the vehicle charging energy consumption based on the power consumption of the vehicle during the charging process and the full charge driving range; A vehicle driving energy consumption calculation module, which is used to calculate the vehicle driving energy consumption based on the power consumption of the vehicle during the driving process and the full charge driving range; A vehicle low-voltage accessory energy consumption calculation module, which is used to calculate the vehicle low-voltage accessory energy consumption based on the power consumption of the low-voltage electrical appliances of the vehicle during the driving process and the full charge driving range; A vehicle charging efficiency calculation module, which is used to calculate the vehicle charging efficiency based on the power consumption of the vehicle during the charging process and the power consumption of the vehicle during the driving process; Wherein the driving process is the process of the battery discharging from the highest charge state to the lowest charge state, and the charging process is the process of the battery charging from the lowest charge state to the highest charge state.

10. The test system for the driving range and energy consumption of an electric vehicle on the road according to claim 7, characterized in that, It further includes: A performance evaluation module, which is used to compare and analyze the full charge driving range and energy consumption of the vehicle with the standard working conditions, and optimize the performance indicators of the whole vehicle driving energy consumption and charging efficiency according to the analysis results.

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