Method and device for determining speed of electric vehicle, electronic equipment and storage medium

Abstract

The invention provides an electric vehicle speed determination method and device, electronic equipment and a storage medium, and relates to the technical field of vehicles, and the method comprises the steps: determining the vehicle body weight of an electric vehicle based on the damping spring deformation quantity of the electric vehicle and the wheel weight of the electric vehicle; determining resistance information of the electric vehicle based on the vehicle body weight of the electric vehicle; determining the power of the electric vehicle at each candidate vehicle speed based on the resistance information of the electric vehicle and the plurality of candidate vehicle speeds; and based on the total battery energy of the electric vehicle and the power at the candidate vehicle speeds, determining a target speed with the maximum endurance of the electric vehicle from the candidate vehicle speeds. The accuracy of the target speed is improved, it is guaranteed that the maximum endurance can be achieved when the vehicle runs for a long distance at the target speed, and the endurance of the electric vehicle is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, and in particular to a method and device for determining the speed of an electric vehicle, an electronic device and a storage medium. BACKGROUND

[0002] The endurance of an electric vehicle is an important indicator of its performance. Currently, methods for improving the endurance of an electric vehicle battery mainly include battery management systems, efficient motor technology, kinetic energy recovery technology, and optimization of vehicle aerodynamic design. The above related technologies mainly rely on battery technology, motor technology, or electronic control technology to improve the utilization rate of electric energy or reduce energy consumption to increase endurance.

[0003] However, the relationship between energy and speed of an electric vehicle is not considered in the related art, which may not maximize the endurance of an electric vehicle when using existing technologies to improve the endurance of an electric vehicle. SUMMARY

[0004] The present application provides a method and device for determining the speed of an electric vehicle, an electronic device and a storage medium to solve the problem that the relationship between energy and speed of an electric vehicle is not considered in the prior art, which may not maximize the endurance of an electric vehicle when using existing technologies to improve the endurance of an electric vehicle. The accuracy of the target speed is improved, and the vehicle can achieve maximum endurance when traveling at the target speed when traveling long distances, thereby improving the endurance of the electric vehicle.

[0005] The present application provides a method for determining the speed of an electric vehicle, comprising: determining the weight of the body of the electric vehicle based on the deformation amount of the shock-absorbing spring of the electric vehicle and the weight of the wheels of the electric vehicle; determining the resistance information of the electric vehicle based on the weight of the body of the electric vehicle; determining the power of the electric vehicle at each candidate speed based on the resistance information of the electric vehicle and a plurality of candidate speeds; determining the target speed at which the endurance of the electric vehicle is the greatest from a plurality of candidate speeds based on the total energy of the battery of the electric vehicle and the power at the candidate speed.

[0006] According to the method for determining the speed of an electric vehicle provided by the present application, the determination of the power of the electric vehicle at each candidate speed based on the resistance information of the electric vehicle and a plurality of candidate speeds comprises: determining the total resistance of the electric vehicle at each candidate speed based on the resistance information of the electric vehicle and each candidate speed; determining the kinetic energy of the electric vehicle at each candidate speed based on the weight of the body and each candidate speed; and determining the power of the electric vehicle at each candidate speed based on each total resistance and each kinetic energy.

[0007] According to the method for determining the speed of the electric vehicle, the resistance information comprises rolling resistance, air resistance and mechanical resistance; the resistance information of the electric vehicle is determined based on the vehicle body weight of the electric vehicle, comprising: determining a first set of undetermined coefficients corresponding to the rolling resistance, a second set of undetermined coefficients corresponding to the air resistance and a third set of undetermined coefficients corresponding to the mechanical resistance based on the vehicle body weight of the electric vehicle and a plurality of groups of accelerations of the electric vehicle; determining the rolling resistance based on the first set of undetermined coefficients, the vehicle body weight and a current speed of the electric vehicle; determining the air resistance based on the second set of undetermined coefficients, a sum of the current speed of the electric vehicle and a wind speed corresponding to the current speed, a windward area of the electric vehicle and an air density in which the electric vehicle is located; and determining the mechanical resistance based on the third set of undetermined coefficients and the current speed of the electric vehicle.

[0008] According to the method for determining the speed of the electric vehicle, the total resistance of the electric vehicle at each candidate speed is determined based on the resistance information of the electric vehicle and each candidate speed, comprising: determining a first wind speed corresponding to each candidate speed; and determining the total resistance of the electric vehicle at each candidate speed based on a sum of each candidate speed and the first wind speed, the rolling resistance, the air resistance and the mechanical resistance.

[0009] According to the method for determining the speed of the electric vehicle, the kinetic energy of the electric vehicle at each candidate speed is determined based on the vehicle body weight and each candidate speed, comprising: determining a second wind speed corresponding to each candidate speed; and determining the kinetic energy of the electric vehicle at each candidate speed based on the vehicle body weight and a sum of each candidate speed and the second wind speed.

[0010] According to the method for determining the speed of the electric vehicle, the target speed with the maximum endurance is determined from a plurality of candidate speeds based on the total energy of the battery of the electric vehicle and the power at each candidate speed, comprising: determining a running time required for the electric vehicle to consume the total energy when traveling at each candidate speed based on the total energy of the battery of the electric vehicle and the power at each candidate speed; determining an endurance corresponding to each candidate speed based on each candidate speed and the running time required for each candidate speed; and determining the candidate speed corresponding to the maximum endurance as the target speed.

[0011] According to the method for determining the speed of the electric vehicle, the body weight of the electric vehicle is determined based on the deformation amount of the shock spring of the electric vehicle and the wheel weight of the electric vehicle, and the method comprises the following steps: determining the front wheel deformation amount of the electric vehicle and the rear wheel deformation amount of the electric vehicle based on the deformation amount of the shock spring; and determining the body weight of the electric vehicle based on the product of the front wheel deformation amount and the front wheel elastic coefficient of the electric vehicle, the product of the rear wheel deformation amount and the rear wheel elastic coefficient of the electric vehicle, and the wheel weight.

[0012] The application further provides a device for determining the speed of an electric vehicle, comprising the following modules: a body weight determining module, configured to determine the body weight of the electric vehicle based on the deformation amount of the shock spring of the electric vehicle and the wheel weight of the electric vehicle; a resistance information determining module, configured to determine the resistance information of the electric vehicle based on the body weight of the electric vehicle; a power determining module, configured to determine the power of the electric vehicle at each candidate speed based on the resistance information of the electric vehicle and a plurality of candidate speeds; a target speed determining module, configured to determine a target speed with the maximum endurance from the plurality of candidate speeds based on the total energy of the battery of the electric vehicle and the power at the candidate speeds.

[0013] The application further provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method for determining the speed of the electric vehicle according to any one of the above embodiments when executing the computer program.

[0014] The application further provides a non-transitory computer readable storage medium, which stores a computer program, and the computer program is executable on a processor to implement the method for determining the speed of the electric vehicle according to any one of the above embodiments.

[0015] The application further provides a computer program product, comprising a computer program, and the computer program is executable on a processor to implement the method for determining the speed of the electric vehicle according to any one of the above embodiments.

[0016] The application provides a method and device for determining the speed of an electric vehicle, electronic equipment and a storage medium. The method comprises the following steps: determining the weight of the vehicle body of the electric vehicle based on the deformation of the shock spring of the electric vehicle and the weight of the wheels of the electric vehicle; determining the power of the electric vehicle at each candidate speed based on the weight of the vehicle body of the electric vehicle and a plurality of candidate speeds; and determining the target speed with the maximum endurance of the electric vehicle from the plurality of candidate speeds based on the total energy of the battery of the electric vehicle and the power at the candidate speed. In this way, the weight of the vehicle body is determined based on the deformation of the shock spring of the electric vehicle and the weight of the wheels of the electric vehicle, thereby improving the accuracy of the weight of the vehicle body in a dynamic scenario. The resistance information of the electric vehicle is determined based on the accurate weight of the vehicle body. The power corresponding to the plurality of candidate speeds is determined based on the resistance information of the electric vehicle and the plurality of candidate speeds, thereby improving the accuracy of the power. The target speed with the maximum endurance of the electric vehicle is determined from the plurality of candidate speeds based on the total energy of the battery of the electric vehicle and the plurality of powers, thereby improving the accuracy of the target speed and ensuring that the vehicle travels at the target speed when running a long distance, thereby improving the endurance of the electric vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0018] Figure 1 is one of the flowcharts of the method for determining the speed of an electric vehicle provided by the present application.

[0019] Figure 2 is another flowchart of the method for determining the speed of an electric vehicle provided by the present application.

[0020] Figure 3 is a structural schematic diagram of the device for determining the speed of an electric vehicle provided by the present application.

[0021] Figure 4 is a structural schematic diagram of the electronic equipment provided by the present application. DETAILED DESCRIPTION

[0022] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below with reference to the drawings in the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort fall within the scope of protection of the present application.

[0023] Electric vehicles need more attention on the issue of endurance compared to fuel vehicles. The endurance of electric vehicles is an important indicator of their performance. With the advancement of battery technology, the energy density gradually increases, providing the basis for longer endurance. At the same time, the motor and electric control technology are constantly optimized, improving efficiency and performance. In addition, the development of lightweight design and intelligent energy management system of the whole vehicle plays an important role in improving the maximum endurance speed of electric vehicles.

[0024] The relevant key technologies include advanced battery management system, which can accurately monitor and manage the state of the battery to ensure efficient energy output and utilization; efficient motor technology, such as permanent magnet synchronous motor, to improve power conversion efficiency; kinetic energy recovery technology to recover energy during braking and other processes to increase the endurance mileage; and optimized vehicle aerodynamic design to reduce wind resistance and energy consumption.

[0025] The above related technologies mainly rely on battery technology, motor technology or electric control technology to improve the utilization rate of electric energy or reduce energy consumption to increase endurance. However, the relationship between the total energy of the battery of the electric vehicle and the speed is not considered in the related technology, which may not maximize the endurance of the electric vehicle when using existing technology to improve the endurance of the electric vehicle.

[0026] Based on the above problems, the electric vehicle speed determination method provided by the present application determines the vehicle body weight through the shock absorbing spring deformation amount and the wheel weight of the electric vehicle, improves the accuracy of the vehicle body weight in dynamic scenarios, determines the resistance information of the electric vehicle according to the accurate vehicle body weight, determines the power corresponding to the multiple candidate speeds according to the resistance information of the electric vehicle and the multiple candidate speeds, improves the accuracy of the power, determines the target speed of the electric vehicle with the maximum endurance from the candidate vehicle speed according to the total energy of the battery of the electric vehicle and the multiple powers, improves the accuracy of the target speed, and ensures that the vehicle travels at the target speed when running long distances to achieve maximum endurance, thereby improving the endurance of the electric vehicle.

[0027] The following will be described in detail. Figures 1-2 The electric vehicle speed determination method of the present application is suitable for any type of electric vehicle. The execution subject of the method can be an electronic device or an electric vehicle speed determination method provided in the electronic device. The electric vehicle speed determination device can be realized by software, hardware or a combination of both.

[0028] It should be noted that the electric vehicle speed determination method provided by the present application can improve the endurance of the electric vehicle. Therefore, the method can be combined with the existing method for improving the endurance of the electric vehicle to make the endurance of the electric vehicle better.

[0029] Figure 1 is one of the flowcharts of the electric vehicle speed determination method provided by the present application, as Figure 1 shown, the method comprises the following steps: Step 101, determining the body weight of the electric vehicle based on the shock spring deformation variable and the wheel weight of the electric vehicle.

[0030] Here, the method for obtaining the shock spring deformation variable includes but is not limited to physical sensors (such as displacement sensors, strain gauges), indirect estimation methods, etc.

[0031] Here, the wheel weight can be obtained by measurement or obtained from the vehicle data provided by the manufacturer.

[0032] Here, the method for determining the body weight can be any suitable method, such as obtaining it through the mapping relationship between the shock spring deformation variable, the wheel weight of the electric vehicle, and the body weight; or obtaining it according to a calculation formula; or obtaining it according to a neural network model.

[0033] Step 102, determining the resistance information of the electric vehicle based on the body weight of the electric vehicle.

[0034] Here, the resistance information includes but is not limited to rolling resistance, air resistance, and mechanical resistance, etc., and the method for determining the resistance information can be any suitable method, such as obtaining it according to the mapping relationship between the body weight and the resistance information, or obtaining it according to a calculation formula, or first calculating the undetermined coefficient in the resistance information calculation formula according to the body weight, then determining the calculation formula according to the undetermined coefficient, and finally calculating the resistance information according to the calculation formula, or directly outputting it using a neural network model.

[0035] Step 103, determining the power of the electric vehicle at each candidate speed based on the resistance information of the electric vehicle and a plurality of candidate speeds.

[0036] Here, the plurality of candidate speeds can be a plurality of speeds within a speed interval, such as a plurality of speeds in 60 kilometers / hour-120 kilometers / hour.

[0037] Here, the power refers to the energy consumed by the vehicle per unit time, and the greater the candidate speed, the greater the corresponding power, and vice versa, the smaller the power.

[0038] Here, the method for determining the power can be any suitable method, such as obtaining it through the mapping relationship between the body weight, the candidate speed, and the power, or obtaining it according to a power calculation formula, or obtaining it according to the output result of a neural network model.

[0039] Step 104, determining the target speed with the maximum endurance of the electric vehicle from a plurality of candidate speeds based on the total energy of the battery of the electric vehicle and the power at the candidate speed.

[0040] Here, the electric vehicle total energy is actually the battery electric energy, the battery electric energy is the product of power and time, and in the case of fixed battery total energy, the power and time are inversely proportional.

[0041] It should be noted that the power is determined according to the vehicle speed, the time is determined according to the battery total energy and the power, and the endurance is determined according to the vehicle speed and the time, so the vehicle speed corresponding to the maximum endurance is determined as the target vehicle speed.

[0042] Here, the target speed is the speed corresponding to the maximum endurance of the electric vehicle, and the method for determining the target speed can be obtained according to the mapping relationship among the battery total energy, the power and the target speed, or obtained according to a calculation formula, or directly output according to a neural network model.

[0043] In the embodiment of the present application, the body weight of the electric vehicle is determined according to the shock absorber spring deformation of the electric vehicle and the wheel weight of the electric vehicle; the power of the electric vehicle at each candidate speed is determined based on the body weight of the electric vehicle and the plurality of candidate speeds; and the target speed with the maximum endurance of the electric vehicle is determined from the plurality of candidate speeds based on the total energy of the battery of the electric vehicle and the power at the candidate speed. In this way, the body weight of the electric vehicle is determined by the shock absorber spring deformation and the wheel weight, which improves the accuracy of the body weight in a dynamic scene, and the accurate body weight is used to determine the resistance information of the electric vehicle; the power corresponding to the plurality of candidate speeds is determined based on the resistance information of the electric vehicle and the plurality of candidate speeds, which improves the accuracy of the power; the target speed with the maximum endurance of the electric vehicle is determined from the plurality of candidate speeds based on the total energy of the battery of the electric vehicle and the plurality of powers, which improves the accuracy of the target speed and ensures that the vehicle travels at the target speed to achieve the maximum endurance when running long distances, thereby improving the endurance of the electric vehicle.

[0044] Further, the power of the electric vehicle at each candidate speed is determined based on the resistance information of the electric vehicle and the plurality of candidate speeds, including: determining the total resistance of the electric vehicle at each candidate speed based on the resistance information of the electric vehicle and each candidate speed; determining the kinetic energy of the electric vehicle at each candidate speed based on the body weight and each candidate speed; and determining the power of the electric vehicle at each candidate speed based on each total resistance and each kinetic energy.

[0045] Here, the total resistance refers to the sum of various resistances when the electric vehicle is running, such as the total resistance of air resistance, rolling resistance and mechanical resistance.

[0046] Here, the method for determining the total resistance can be any suitable method, such as through the mapping relationship among the resistance information, the candidate speed and the total resistance; or calculated by a calculation formula; or obtained according to a neural network model.

[0047] Here, the kinetic energy is the energy that the electric vehicle itself needs to consume when running. Among them, the kinetic energy can be obtained by the mapping relationship among the vehicle body weight, the candidate vehicle speed and the kinetic energy, can be obtained by a calculation formula, and can also be obtained according to a neural network model.

[0048] Here, the power can be the sum of the total resistance and the kinetic energy, or the weighted sum of the total resistance and the kinetic energy.

[0049] Specifically, after obtaining the vehicle body weight and the plurality of candidate vehicle speeds of the electric vehicle, the resistance information is determined according to the vehicle body weight, the total resistance is determined according to the resistance information and the candidate vehicle speed, and the kinetic energy required for the vehicle to run at the candidate vehicle speed is determined according to the vehicle body weight and the candidate vehicle speed. The total resistance and the kinetic energy are added to obtain the energy consumed by the vehicle per second at the candidate vehicle speed, that is, the power.

[0050] In the embodiment of the present application, the total resistance and the kinetic energy of the electric vehicle are comprehensively determined to obtain the energy consumed by the electric vehicle per second at the candidate vehicle speed, which improves the accuracy of the power and further improves the accuracy of the electric vehicle endurance.

[0051] Further, the resistance information includes rolling resistance, air resistance and mechanical resistance; the resistance information of the electric vehicle is determined based on the vehicle body weight of the electric vehicle, including: determining a first set of undetermined coefficients corresponding to the rolling resistance, a second set of undetermined coefficients corresponding to the air resistance and a third set of undetermined coefficients corresponding to the mechanical resistance based on the vehicle body weight of the electric vehicle and a plurality of groups of accelerations of the electric vehicle; determining the rolling resistance based on the first set of undetermined coefficients, the vehicle body weight and the current speed of the electric vehicle; determining the air resistance based on the second set of undetermined coefficients, the sum of the current speed of the electric vehicle and the wind speed corresponding to the current speed, the windward area of the electric vehicle and the air density in which the electric vehicle is located; and determining the mechanical resistance based on the third set of undetermined coefficients and the current speed of the electric vehicle.

[0052] The rolling resistance is the resistance affected by the tire pressure and the vehicle body weight, the air resistance is the resistance affected by the dynamic pressure of the airflow relative speed and the windward area, and the mechanical resistance is the friction loss of the gear and the friction loss of the motor.

[0053] Here, the rolling resistance can be the ratio of the first value and the second value, the first value can be the product of the vehicle body weight and the third value, the third value can be the sum of the first coefficient in the first set of undetermined coefficients and the fourth value, or the weighted sum of the first coefficient and the fourth value, the fourth value is the product of the second undetermined coefficient in the first set of undetermined coefficients and the current speed, and the second value can be the difference between the constant and the exponential function, the exponent of the exponential function being the product of the third coefficient in the first set of undetermined coefficients and the vehicle body weight.

[0054] Here, the air resistance can be a quotient of a fifth numerical value divided by a constant, the fifth numerical value can be a product of a coefficient in the second set of undetermined coefficients, a sum of the current vehicle speed and the wind speed, the windward area, and the air density, or all the products after weighting.

[0055] Here, the mechanical resistance can be a sum of a sixth numerical value and a seventh numerical value, or a weighted sum of the sixth numerical value and the seventh numerical value, the sixth numerical value being a first coefficient in the third set of undetermined coefficients, the seventh numerical value can be a product of a second coefficient in the third set of undetermined coefficients and the current vehicle speed.

[0056] Here, the vehicle manufacturer can perform a plurality of sets of coasting experiments to obtain a plurality of sets of experimental data, and obtain the undetermined coefficients according to the plurality of sets of experimental data and the following formula (1): wherein, represents the rolling resistance, represents the air resistance, represents the mechanical resistance, represents the vehicle body weight, represents the speed, represents the time, represents the derivative of the speed with respect to the time, and the acceleration is obtained.

[0057] For example, the following are the calculation formulas of the rolling resistance, the air resistance, and the mechanical resistance: The rolling resistance of the vehicle in operation is generally affected by the tire pressure and the vehicle body weight. In the case where the tire pressure and the mass are constant, the resistance is linearly related to the vehicle speed. The rolling resistance coefficient is also linearly related to the vehicle body mass, and the rolling resistance is calculated according to the following formula (2): (2) wherein, represents the gravitational acceleration, , and represent the first set of undetermined coefficients, represents the current vehicle speed, represents the exponential function.

[0058] Further, the air resistance is proportional to the dynamic pressure of the relative speed of the airflow and the windward area, and the air resistance is calculated according to the following formula (3): (3) wherein, represents the second set of undetermined coefficients, represents the windward area, represents the air density, represents the sum of the vehicle speed and the wind speed, and when there is no wind or a slight wind, U≈V.

[0059] mechanical resistance The calculation is as follows formula (4): (4) wherein, and represent the third undetermined coefficient group.

[0060] Here, the rolling resistance, air resistance and mechanical resistance can be calculated according to the above formula (2), (3) and (4).

[0061] In the embodiment of the application, the undetermined coefficients of the resistance calculation formula are determined by the vehicle body weight and the plurality of acceleration groups, which improves the accuracy of the undetermined coefficients and further improves the accuracy of the resistance information.

[0062] Further, the total resistance of the electric vehicle at each candidate vehicle speed is determined based on the resistance information of the electric vehicle and each candidate vehicle speed, comprising: determining the first wind speed corresponding to each candidate vehicle speed; determining the total resistance of the electric vehicle at each candidate vehicle speed based on the sum of each candidate vehicle speed and the first wind speed, the rolling resistance, the air resistance and the mechanical resistance.

[0063] Here, the total resistance can be the sum of the eighth value and the ninth value, the eighth value can be the sum of the candidate vehicle speed and the first wind speed, and the ninth value can be the sum or weighted sum of the rolling resistance, the air resistance and the mechanical resistance.

[0064] In the embodiment of the application, the various resistance factors when the vehicle is running are comprehensively measured by the candidate vehicle speed, the first wind speed, the rolling resistance, the air resistance and the mechanical resistance, which improves the accuracy of the total resistance, thereby providing accurate data basis for subsequent determination of the target speed and ensuring maximum endurance of the electric vehicle.

[0065] Further, the kinetic energy of the electric vehicle at each candidate vehicle speed is determined based on the vehicle body weight and each candidate vehicle speed, comprising: determining the second wind speed corresponding to each candidate vehicle speed; determining the kinetic energy of the electric vehicle at each candidate vehicle speed based on the vehicle body weight and the sum of the candidate vehicle speed and the second wind speed.

[0066] Here, the kinetic energy can be the product of the vehicle body weight and the sum of the candidate vehicle speed and the second wind speed, or the power of the vehicle body weight and the product of the sum of the candidate vehicle speed and the second wind speed.

[0067] The calculation formula of the power is as follows formula (5): (5) In the embodiment of the present application, the kinetic energy of the electric vehicle is determined by the candidate vehicle speed, the second wind speed and the vehicle body weight, the accuracy of the kinetic energy is improved, accurate data basis is provided for subsequent determination of the target speed, and the maximum cruising range of the electric vehicle is ensured.

[0068] Further, the target speed at which the cruising range of the electric vehicle is the maximum is determined from the plurality of candidate vehicle speeds based on the total energy of the battery of the electric vehicle and the power at the candidate vehicle speed, comprising: determining the running time required for the electric vehicle to consume the total energy at each candidate vehicle speed based on the total energy of the battery of the electric vehicle and the power at the candidate vehicle speed; determining the cruising range corresponding to each candidate vehicle speed based on each candidate vehicle speed and the running time required for each candidate vehicle speed; and determining the candidate vehicle speed corresponding to the maximum cruising range as the target speed.

[0069] Here, the running time can be the quotient of the total energy of the battery divided by the power, or the quotient of the total energy of the battery multiplied by the weight divided by the power.

[0070] Here, the cruising range can be the product of the candidate vehicle speed and the running time, or the weighted product of the candidate vehicle speed and the running time.

[0071] Specifically, after obtaining the total energy of the battery and the power, the running time is obtained by dividing the total energy of the electric vehicle by the power, the cruising range is obtained by multiplying the candidate vehicle speed by the corresponding running time, and the candidate vehicle speed corresponding to the maximum cruising range is determined as the target speed by comparing the cruising ranges corresponding to all candidate vehicle speeds.

[0072] In the embodiment of the present application, the target speed at which the cruising range of the electric vehicle is the maximum is determined from the plurality of candidate vehicle speeds based on the total energy of the battery of the electric vehicle and the plurality of powers, the accuracy of the target speed is improved, and when the vehicle is running long distances, the vehicle can travel at the target speed to achieve the maximum cruising range, thereby improving the cruising range of the electric vehicle.

[0073] Further, the vehicle body weight of the electric vehicle is determined based on the deformation amount of the shock spring of the electric vehicle and the wheel weight of the electric vehicle, comprising: determining the front wheel deformation amount of the electric vehicle and the rear wheel deformation amount of the electric vehicle based on the deformation amount of the shock spring; and determining the vehicle body weight of the electric vehicle based on the product of the front wheel deformation amount and the front wheel elastic coefficient of the electric vehicle, the product of the rear wheel deformation amount and the rear wheel elastic coefficient of the electric vehicle and the wheel weight.

[0074] Here, the method for determining the front wheel deformation amount and the rear wheel deformation amount can be any suitable method, such as being obtained through a mapping relationship among the deformation amount of the shock spring, the front wheel deformation amount and the rear wheel deformation amount, or being obtained through a calculation formula, or being obtained according to the output of a neural network model.

[0075] Here, the product of the vehicle body weight and the gravitational acceleration can be a sum or a weighted sum of a tenth value, an eleventh value, and a twelfth value, the tenth value can be a product of the front wheel deformation variable and the front wheel elastic coefficient, the eleventh value can be a product of the rear wheel deformation variable and the rear wheel elastic coefficient. The twelfth value can be a product of the wheel weight and the gravitational acceleration.

[0076] For example, the calculation of the vehicle body weight can be as follows formula (6): (6) wherein, represents the front wheel elastic coefficient, represents the front wheel deformation variable, represents the rear wheel elastic coefficient, represents the rear wheel deformation variable, represents the wheel weight.

[0077] In the embodiment of the application, the real-time weight of the vehicle including the passengers is estimated by the deformation variable of the shock-absorbing spring of the vehicle, and the accuracy of the vehicle body weight in the dynamic scene is improved.

[0078] The following is an application scenario of a method for determining the speed of an electric vehicle according to an embodiment of the application.

[0079] Figure 2 is a second flowchart of a method for determining the speed of an electric vehicle according to an embodiment of the application, as shown in the figure, the method comprises the following steps: Figure 2 Step S201, determining the vehicle body weight of the electric vehicle based on the deformation variable of the shock-absorbing spring of the electric vehicle and the wheel weight of the electric vehicle.

[0080] Step S202, determining a first set of undetermined coefficients corresponding to the rolling resistance, a second set of undetermined coefficients corresponding to the air resistance, and a third set of undetermined coefficients corresponding to the mechanical resistance based on the vehicle body weight of the electric vehicle and a plurality of accelerations of the electric vehicle.

[0081] Step S203, determining the rolling resistance based on the first set of undetermined coefficients, the vehicle body weight, and the current speed of the electric vehicle.

[0082] Step S204, determining the air resistance based on the second set of undetermined coefficients, the sum of the current speed of the electric vehicle and the wind speed corresponding to the current speed, the windward area of the electric vehicle, and the air density in which the electric vehicle is located.

[0083] Step S205, determining the mechanical resistance based on the third set of undetermined coefficients and the current speed of the electric vehicle.

[0084] Step S206, determining the total resistance of different candidate speeds based on the rolling resistance, the air resistance, the mechanical resistance, and the candidate speed.

[0085] ​Step S207, based on the body weight and each candidate vehicle speed, determining the kinetic energy of the electric vehicle at each candidate vehicle speed.

[0086] Step S208, based on the total resistance and the kinetic energy, determining the power of the electric vehicle at each candidate vehicle speed.

[0087] Step S209, based on the total energy of the battery of the electric vehicle and the power at the candidate vehicle speed, determining the running time required for the total energy to be consumed when the electric vehicle travels at each candidate vehicle speed. Step S210, based on each candidate vehicle speed and the running time required for each candidate vehicle speed, determining the corresponding cruising range of each candidate vehicle speed.

[0088] Step S211, determining the candidate vehicle speed corresponding to the maximum cruising range as the target speed.

[0089] In the embodiment of the application, the real-time weight of the vehicle after carrying passengers is estimated by using the deformation amount of the shock-absorbing spring of the vehicle; various resistance factors during the operation of the vehicle are comprehensively measured, including wind resistance, rolling resistance and mechanical resistance; and the optimal speed at the maximum cruising range is obtained by simplifying the energy equation through software, thereby improving the cruising range of the electric vehicle.

[0090] The electric vehicle speed determination device provided by the application will be described below, and the electric vehicle speed determination device described below can be correspondingly referred to the electric vehicle speed determination method described above.

[0091] Figure 3 is a structural schematic diagram of the electric vehicle speed determination device provided by the application, as Figure 3 shown, the electric vehicle speed determination device 300 comprises: a body weight determination module 310, configured to determine the body weight of the electric vehicle based on the deformation amount of the shock-absorbing spring of the electric vehicle and the wheel weight of the electric vehicle; a resistance information determination module 320, configured to determine the resistance information of the electric vehicle based on the body weight of the electric vehicle; a power determination module 330, configured to determine the power of the electric vehicle at each candidate vehicle speed based on the resistance information of the electric vehicle and a plurality of candidate vehicle speeds; a target speed determination module 340, configured to determine the target speed of the electric vehicle with the maximum cruising range from a plurality of candidate vehicle speeds based on the total energy of the battery of the electric vehicle and the power at the candidate vehicle speed.

[0092] In another embodiment, the power determination module 330 is specifically configured to: determine total resistance of the electric vehicle at each of the candidate vehicle speeds based on the resistance information of the electric vehicle and each of the candidate vehicle speeds; determine kinetic energy of the electric vehicle at each of the candidate vehicle speeds based on the vehicle body weight and each of the candidate vehicle speeds; and determine power of the electric vehicle at each of the candidate vehicle speeds based on each of the total resistance and each of the kinetic energy.

[0093] In another embodiment, the resistance information includes rolling resistance, air resistance and mechanical resistance, and the resistance information determination module 320 is further specifically configured to: determine a first set of undetermined coefficients corresponding to the rolling resistance, a second set of undetermined coefficients corresponding to the air resistance and a third set of undetermined coefficients corresponding to the mechanical resistance based on the vehicle body weight of the electric vehicle and a plurality of groups of accelerations of the electric vehicle; determine the rolling resistance based on the first set of undetermined coefficients, the vehicle body weight and a current vehicle speed of the electric vehicle; determine the air resistance based on the second set of undetermined coefficients, a sum of the current vehicle speed of the electric vehicle and a wind speed corresponding to the current vehicle speed, an air- facing area of the electric vehicle and an air density in which the electric vehicle is located; and determine the mechanical resistance based on the third set of undetermined coefficients and a current speed of the electric vehicle.

[0094] In another embodiment, the power determination module 330 is further specifically configured to: determine a first wind speed corresponding to each of the candidate vehicle speeds; and determine total resistance of the electric vehicle at each of the candidate vehicle speeds based on a sum of each of the candidate vehicle speeds and the first wind speed, the rolling resistance, the air resistance and the mechanical resistance.

[0095] In another embodiment, the power determination module 330 is further specifically configured to: determine a second wind speed corresponding to each of the candidate vehicle speeds; and determine kinetic energy of the electric vehicle at each of the candidate vehicle speeds based on the vehicle body weight and a sum of each of the candidate vehicle speeds and the second wind speed.

[0096] In another embodiment, the target speed determination module 340 is specifically configured to: determine a running time required for the electric vehicle to consume the total energy when traveling at each of the candidate vehicle speeds based on the total energy of the battery of the electric vehicle and the power at each of the candidate vehicle speeds; determine a range corresponding to each of the candidate vehicle speeds based on each of the candidate vehicle speeds and the running time required for each of the candidate vehicle speeds; and determine the candidate vehicle speed corresponding to the maximum range as the target speed.

[0097] In another embodiment, the vehicle body weight determination module 310 is specifically configured to: determine a front wheel deformation variable of the electric vehicle and a rear wheel deformation variable of the electric vehicle based on the shock spring deformation variable; and determine the vehicle body weight of the electric vehicle based on a product of the front wheel deformation variable and a front wheel spring coefficient of the electric vehicle, a product of the rear wheel deformation variable and a rear wheel spring coefficient of the electric vehicle and the wheel weight.

[0098] Figure 4 This is a schematic diagram of the structure of the electronic device provided by the present invention, such as... Figure 4 As shown, the electronic device may include: a processor 410, a communications interface 420, a memory 430, and a communication bus 440, wherein the processor 410, the communications interface 420, and the memory 430 communicate with each other through the communication bus 440. The processor 410 can call logical instructions in the memory 430 to execute a method for determining the speed of the trolley. This method includes: determining the weight of the trolley body based on the deformation of the trolley's shock absorber springs and the weight of the trolley's wheels; determining the drag information of the trolley based on the weight of the trolley body; determining the power of the trolley at each of the candidate speeds based on the drag information and multiple candidate speeds; and determining the target speed with the maximum range of the trolley from the multiple candidate speeds based on the total battery energy of the trolley and the power at the candidate speeds.

[0099] Furthermore, the logical instructions in the aforementioned memory 430 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0100] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer is able to execute the method for determining the speed of a tram provided by the above methods. The method includes: determining the body weight of the tram based on the deformation of the tram's shock absorber springs and the weight of the tram's wheels; determining the resistance information of the tram based on the body weight of the tram; determining the power of the tram at each of the candidate speeds based on the resistance information of the tram and multiple candidate speeds; and determining the target speed with the maximum range of the tram from the multiple candidate speeds based on the total battery energy of the tram and the power at the candidate speeds.

[0101] In yet another aspect, the present application also provides a non-transitory computer readable storage medium having stored thereon a computer program, which, when executed by a processor, implements the method for determining the speed of a trolley car provided by the above-mentioned methods, the method comprising: determining the body weight of the trolley car based on the deformation of the shock-absorbing spring of the trolley car and the wheel weight of the trolley car; determining the resistance information of the trolley car based on the body weight of the trolley car; determining the power of the trolley car at each of a plurality of candidate speeds of the trolley car based on the resistance information of the trolley car and the plurality of candidate speeds; and determining a target speed at which the trolley car has the maximum endurance from the plurality of candidate speeds based on the total energy of the battery of the trolley car and the power at the candidate speeds.

[0102] The device embodiments described above are merely illustrative, wherein the units described as separate components can or can not be physically separate, and the components displayed as units can or can not be physical units, i.e., can be located in one place, or can be distributed to multiple network units. Part or all of the modules can be selected to achieve the purpose of the embodiment scheme according to actual needs. Those skilled in the art can understand and implement without creative labor.

[0103] From the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be realized by means of software plus a necessary general hardware platform, and of course can also be realized by hardware. Based on such understanding, the above technical solutions, essentially or in other words, the part that contributes to the prior art, can be embodied in the form of a software product, which can be stored in a computer readable storage medium, such as a ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute the methods described in each embodiment or some parts of the embodiments.

[0104] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for determining the speed of a tram, characterized in that, include: The body weight of the trolley is determined based on the deformation of the shock absorber springs and the weight of the wheels. Based on the vehicle's weight, the vehicle's resistance information is determined; Based on the resistance information of the tram and multiple candidate speeds, the power of the tram at each of the candidate speeds is determined; Based on the total battery energy of the electric vehicle and the power at the candidate vehicle speed, the target speed with the maximum range of the electric vehicle is determined from a plurality of candidate vehicle speeds.

2. The method for determining tram speed according to claim 1, characterized in that, The step of determining the power of the trolley at each of the candidate speeds based on the trolley's resistance information and multiple candidate speeds includes: Based on the resistance information of the tram and each of the candidate speeds, the total resistance of the tram at each of the candidate speeds is determined; Based on the vehicle weight and each of the candidate vehicle speeds, the kinetic energy of the trolley at each of the candidate vehicle speeds is determined; Based on the total resistance and kinetic energy, the power of the tram at each of the candidate speeds is determined.

3. The method for determining tram speed according to claim 1, characterized in that, The resistance information includes rolling resistance, air resistance, and mechanical resistance; determining the resistance information of the tram based on its body weight includes: Based on the vehicle's weight and multiple accelerations, a first set of undetermined coefficients corresponding to the rolling resistance, a second set of undetermined coefficients corresponding to the air resistance, and a third set of undetermined coefficients corresponding to the mechanical resistance are determined. The rolling resistance is determined based on the first set of undetermined coefficients, the vehicle weight, and the current speed of the trolley. The air resistance is determined based on the second set of undetermined coefficients, the sum of the current speed of the tram and the wind speed corresponding to the current speed, the frontal area of ​​the tram, and the air density where the tram is located. The mechanical resistance is determined based on the third set of undetermined coefficients and the current speed of the tram.

4. The method for determining tram speed according to claim 3, characterized in that, The step of determining the total resistance of the trolley at each of the candidate speeds based on the trolley's resistance information and each candidate speed includes: Determine the first wind speed corresponding to each of the candidate vehicle speeds; The total resistance of the trolley at each of the candidate vehicle speeds is determined based on the sum of each candidate vehicle speed and the first wind speed, the rolling resistance, the air resistance, and the mechanical resistance.

5. The method for determining tram speed according to claim 2, characterized in that, The step of determining the kinetic energy of the trolley at each of the candidate vehicle speeds based on the vehicle body weight and each of the candidate vehicle speeds includes: Determine the second wind speed corresponding to each of the candidate vehicle speeds; Based on the sum of the vehicle weight, the candidate vehicle speed, and the second wind speed, the kinetic energy of the trolley at each of the candidate vehicle speeds is determined.

6. The method for determining tram speed according to any one of claims 1 to 3, characterized in that, The process of determining the target speed for maximizing the electric vehicle's range from multiple candidate vehicle speeds, based on the total battery energy of the electric vehicle and the power at the candidate vehicle speeds, includes: Based on the total battery energy of the electric vehicle and the power at the candidate vehicle speed, determine the running time required for the electric vehicle to consume the total energy when traveling at each of the candidate vehicle speeds; Based on each candidate vehicle speed and the running time required for each candidate vehicle speed, determine the driving range corresponding to each candidate vehicle speed; The candidate vehicle speed corresponding to the maximum range is determined as the target speed.

7. The method for determining tram speed according to any one of claims 1 to 3, characterized in that, The determination of the trolley's body weight based on the trolley's shock absorber spring deformation and wheel weight includes: Based on the deformation of the shock absorber springs, the deformation of the front wheels and the deformation of the rear wheels of the tram are determined. The vehicle body weight is determined based on the product of the front wheel deformation and the front wheel elastic coefficient of the trolley, the product of the rear wheel deformation and the rear wheel elastic coefficient of the trolley, and the wheel weight.

8. A device for determining the speed of a tram, characterized in that, include: The vehicle body weight determination module is used to determine the vehicle body weight based on the shock absorber spring deformation and the wheel weight of the trolley. The resistance information determination module is used to determine the resistance information of the tram based on the tram's body weight; A power determination module is used to determine the power of the trolley at each of the candidate speeds based on the trolley's resistance information and multiple candidate speeds. The target speed determination module is used to determine the target speed with the maximum range of the electric vehicle from a plurality of candidate vehicle speeds, based on the total battery energy of the electric vehicle and the power at the candidate vehicle speeds.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that, When the processor executes the computer program, it implements the method for determining the speed of the tram as described in any one of claims 1 to 7.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the method for determining the speed of the tram as described in any one of claims 1 to 7.

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