A driving speed determination method and device, a storage medium and a vehicle

Abstract

The application provides a driving speed determination method and device, a storage medium and a vehicle. The determination method comprises the following steps: determining a resistance coefficient corresponding to at least one road section in a navigation route of the vehicle, wherein the resistance coefficient is used to represent the influence degree of the road section on the resistance of the vehicle; determining the road surface resistance of the vehicle on the road section based on the resistance coefficient; and determining the driving speed of the vehicle on the road section based on the road surface resistance and the air resistance of the vehicle on the road section. The application determines the resistance coefficient of at least one road section in the navigation route, thereby determining the road surface resistance of the vehicle on the road section. Based on the road surface resistance and the air resistance, the driving speed of the vehicle on the road section can be determined, so that the vehicle can drive at a low fuel consumption or low power consumption speed, thereby saving the energy consumption of the vehicle and helping green travel.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobiles, and in particular to a driving speed determination method and device, a storage medium and a vehicle. BACKGROUND

[0002] The driving speed of a vehicle affects the resistance (for example, air resistance, that is, wind resistance, which is not obvious in a low-speed state) during the driving process of the vehicle. Generally, the greater the driving speed, the greater the air resistance, and the greater the air resistance, the more energy the vehicle needs to operate. Therefore, in order to make the vehicle more fuel-efficient (for a fuel vehicle) or more power-efficient (for an electric vehicle), the driving speed needs to be controlled within a suitable range.

[0003] However, in the related art, the driver can only determine the fuel-efficient or power-efficient vehicle speed through experience, and cannot achieve a good fuel-saving or power-saving effect. SUMMARY

[0004] Therefore, the present application aims to provide a driving speed determination method and device, a storage medium and a vehicle, so as to help the vehicle to drive at a low fuel consumption or low power consumption speed and promote green travel.

[0005] To achieve the above-mentioned purpose, the technical scheme of the present application is as follows:

[0006] A driving speed determination method, the determination method comprising:

[0007] determining a resistance coefficient corresponding to at least one road section in a navigation route of a vehicle, the resistance coefficient being used to represent the influence degree of the road section on the resistance of the vehicle;

[0008] determining the road surface resistance of the vehicle on the road section based on the resistance coefficient;

[0009] determining the driving speed of the vehicle on the road section based on the road surface resistance and the air resistance of the vehicle on the road section.

[0010] Further, the determination of the resistance coefficient corresponding to at least one road section in the navigation route of the vehicle comprises:

[0011] obtaining the road surface type and the current weather information of the road section;

[0012] determining a second road surface type of the road section based on the first road surface type and the current weather information;

[0013] determining the resistance coefficient corresponding to the road section based on the second road surface type.

[0014] Further, the determining the road surface resistance of the vehicle on the road section based on the drag coefficient comprises:

[0015] obtaining a gravity of the vehicle;

[0016] determining the road surface resistance of the vehicle on the road section based on the gravity and the drag coefficient.

[0017] Further, the determining the driving speed of the vehicle on the road section based on the road surface resistance and the air resistance of the vehicle on the road section comprises:

[0018] determining a critical driving speed of the vehicle on the road section based on the road surface resistance and the air resistance;

[0019] determining the driving speed of the vehicle on the road section as a speed less than or equal to the critical driving speed.

[0020] Further, the determining the corresponding critical driving speed of the vehicle based on the road surface resistance and the air resistance comprises:

[0021] obtaining a windward area and an air resistance coefficient of the vehicle, and environmental information of the vehicle;

[0022] determining a function relationship between the air resistance and the corresponding driving speed based on the windward area, the air resistance coefficient and the environmental information;

[0023] determining the corresponding driving speed of the air resistance as the critical driving speed when the air resistance is equal to the road surface resistance based on the function relationship.

[0024] Further, the obtaining the environmental information comprises:

[0025] obtaining an air pressure and a temperature in the environment where the vehicle is located;

[0026] determining the environmental information based on the air pressure and the temperature.

[0027] Further, after the determining the driving speed of the vehicle on the road section based on the road surface resistance and the air resistance of the vehicle on the road section, the determining method further comprises:

[0028] sending the determined driving speed to a vehicle machine before the vehicle drives into the road section, so as to instruct a user to trigger a control instruction;

[0029] controlling the vehicle to drive on the road section at the determined driving speed in response to the triggering of the control instruction.

[0030] Compared with the prior art, the determination method of the driving speed has the following advantages:

[0031] The application provides a determination method of driving speed, which comprises the following steps: determining a resistance coefficient corresponding to at least one road section in a navigation route of a vehicle, wherein the resistance coefficient is used to represent the influence degree of the road section on the vehicle; determining a road surface resistance of the vehicle on the road section based on the resistance coefficient; and determining a driving speed of the vehicle on the road section based on the road surface resistance and an air resistance of the vehicle on the road section.

[0032] Therefore, by determining the resistance coefficient corresponding to at least one road section in a navigation route of a vehicle, the road surface resistance of the vehicle on the road section is determined, and the driving speed of the vehicle on the road section is determined based on the road surface resistance and the air resistance, which meets the fuel-saving speed range or the power-saving speed range of the vehicle, so that the vehicle can drive at a low fuel consumption or low power consumption speed, thereby saving the energy consumption of the vehicle and helping green travel.

[0033] Another purpose of the application is to provide a determination device of driving speed, so that the vehicle drives at a low fuel consumption or low power consumption speed, thereby helping green travel.

[0034] To achieve the above purpose, the technical scheme of the application is as follows:

[0035] A determination device of driving speed, which comprises the following steps:

[0036] a first determination unit configured to determine a resistance coefficient corresponding to at least one road section in a navigation route of a vehicle, wherein the resistance coefficient is used to represent the influence degree of the road section on the vehicle;

[0037] a second determination unit configured to determine a road surface resistance of the vehicle on the road section based on the resistance coefficient;

[0038] a third determination unit configured to determine a driving speed of the vehicle on the road section based on the road surface resistance and an air resistance of the vehicle on the road section.

[0039] The determination device has the same advantages as the determination method described above, and thus no further description is given herein.

[0040] Another purpose of the application is to provide a computer readable storage medium, so that the vehicle drives at a low fuel consumption or low power consumption speed, thereby helping green travel.

[0041] To achieve the above purpose, the technical scheme of the application is as follows:

[0042] A computer readable storage medium for storing a computer program for performing the determination method.

[0043] The computer readable storage medium has the same advantages as the determination method relative to the prior art, which will not be repeated here.

[0044] Another purpose of the present application is to provide a vehicle that allows the vehicle to travel at a low fuel consumption or low power consumption travel speed, thereby promoting green travel.

[0045] To achieve the above-mentioned purposes, the technical scheme of the present application is as follows:

[0046] A vehicle, comprising a control module for implementing the determination method.

[0047] The vehicle has the same advantages as the determination method relative to the prior art, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0048] The accompanying drawings, which form a part of the present application, are intended to provide further understanding of the present application, and the illustrative embodiments thereof and their descriptions serve to explain the present application, and do not constitute improper limitations on the present application. In the drawings:

[0049] Figure 1 A step flow chart of a determination method of a travel speed according to an embodiment of the present application;

[0050] Figure 2 A step flow chart of a determination method of a road section corresponding resistance coefficient according to an embodiment of the present application;

[0051] Figure 3 A step flow chart of a determination method of a road surface resistance of a vehicle on a road section according to an embodiment of the present application;

[0052] Figure 4 A step flow chart of another determination method of a travel speed according to an embodiment of the present application;

[0053] Figure 5 A step flow chart of a determination method of a critical travel speed according to an embodiment of the present application;

[0054] Figure 6 A step flow chart of a determination method of a critical travel speed according to an embodiment of the present application;

[0055] Figure 7 A display schematic diagram of a travel speed according to an embodiment of the present application;

[0056] Figure 8A structure schematic diagram of a driving speed determination device is shown in the embodiments of the present application.

[0057] The reference signs: 1, determination device; 101, first determination unit; 102, second determination unit; 103, third determination unit. DETAILED DESCRIPTION

[0058] It should be explained that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0059] The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0060] At present, the country vigorously advocates green travel, calls on people to adopt a travel mode with less impact on the environment, and reduces energy consumption and pollution as much as possible in travel. In order to respond to the call of the country's green travel, people choose to reduce the fuel consumption or power consumption of the vehicle when traveling. The fuel consumption and power consumption of the vehicle are related to the driving speed of the vehicle, and the driving speed of the vehicle affects the resistance (for example: air resistance) in the driving process of the vehicle, and the air resistance will increase with the increase of the driving speed, that is, the driving speed increases, and the air resistance of the vehicle will increase very obviously, and the fuel consumption or power consumption of the vehicle will also increase exponentially.

[0061] In order to reduce the fuel consumption or power consumption of the vehicle, the driver can only determine the fuel-saving or power-saving speed by experience, and cannot achieve a good fuel-saving or power-saving effect.

[0062] Therefore, the embodiments of the present application propose a driving speed determination method, so that the vehicle travels at a low fuel consumption or low power consumption driving speed, thereby assisting the green travel advocated by the country. For specific reference Figure 1 , Figure 1 A step flowchart of a driving speed determination method is shown in the embodiments of the present application, as Figure 1 shown, the determination method comprises:

[0063] Step S1, determining a resistance coefficient corresponding to at least one road section in a navigation route of a vehicle, the resistance coefficient being used to represent the influence degree of the road section on the resistance of the vehicle.

[0064] In actual situations, when the air resistance of a vehicle on a certain road section exceeds the road surface resistance on the road section, the air resistance will become the main resistance of the vehicle, and will increase greatly with the increase of the driving speed of the vehicle, which seriously affects the fuel consumption or power consumption of the vehicle. Because, in order to avoid that the air resistance of the vehicle is too large and thus affects the fuel consumption or power consumption of the vehicle, it is necessary to determine the road surface resistance of the vehicle on the road section.

[0065] The road section refers to a section of road with the same road surface material. In actual vehicle travel, the vehicle usually passes through multiple road sections, i.e., multiple road sections with different road surface materials, such as a road section with asphalt pavement, a road section with concrete pavement, a road section with gravel pavement, etc. Road sections with different road surface materials have different degrees of influence on the resistance of the vehicle, i.e., different resistance coefficients, so that the vehicle experiences different road surface resistances on road sections with different road surface materials.

[0066] Therefore, after the driver formulates a navigation route for the vehicle in the vehicle navigation, the embodiment of the present application can determine the resistance coefficient corresponding to at least one road section in the navigation route. In specific implementation, if the navigation route formulated by the driver has only one road section, the resistance coefficient corresponding to this road section is determined, and if there are multiple road sections, the resistance coefficients corresponding to these road sections are determined. Specifically, according to the vehicle navigation, the road sections of the navigation route are determined. For example, according to the vehicle navigation, it is determined that all the road sections on the navigation route are the same road section, such as a road section with asphalt pavement, and then the resistance coefficient corresponding to the road section with asphalt pavement is determined. For another example, according to the vehicle navigation, it is determined that there are two road sections on the navigation route, such as a road section with asphalt pavement and a road section with gravel pavement, and then the resistance coefficients corresponding to the road section with asphalt pavement and the road section with gravel pavement are determined.

[0067] In step S2, the road surface resistance of the vehicle on the road section is determined based on the resistance coefficient.

[0068] After the resistance coefficient corresponding to the road section is determined, the road surface resistance of the vehicle on the road section can be determined according to the determined resistance coefficient. In specific implementation, if the navigation route formulated by the driver has only one road section, the resistance coefficient corresponding to this road section is determined, and the road surface resistance of the vehicle on this road section is determined based on the determined resistance coefficient; if the navigation route formulated by the driver has multiple road sections, the resistance coefficients corresponding to these road sections are determined, and the road surface resistances of the vehicle on the corresponding road sections are determined based on the resistance coefficients.

[0069] In step S3, the driving speed of the vehicle on the road section is determined based on the road surface resistance and the air resistance of the vehicle on the road section.

[0070] The air resistance refers to the air resistance of the vehicle when the vehicle travels at a low fuel consumption or low power consumption driving speed, i.e., the air resistance of the vehicle on the road section does not exceed the road surface resistance. Therefore, when the road surface resistance of the vehicle on the road section is determined, the air resistance of the vehicle on the road section is also determined, and the driving speed of the vehicle on the road section can be determined based on the determined air resistance. The driving speed meets the fuel-saving speed interval or the power-saving speed interval of the vehicle, so that the vehicle can travel at a low fuel consumption or low power consumption speed, saving the energy consumption of the whole vehicle and helping green travel.

[0071] In a specific implementation, the actual driving speed of the vehicle on the road section can save the energy consumption of the vehicle as long as it does not exceed the determined driving speed.

[0072] In addition, it should be noted that the road sections in the embodiments of the present application do not include highway sections.

[0073] In an optional implementation, the step of determining the resistance coefficient corresponding to at least one road section in the navigation route of the vehicle can refer to Figure 2 , Figure 2 A flow chart of the steps of the method for determining the resistance coefficient corresponding to a road section according to the embodiments of the present application is shown in FIG. 1. Figure 2 As shown in FIG. 1, the steps include:

[0074] In step S11, the first road surface type and the current weather information of the road section are obtained.

[0075] The first road surface type represents the classification of the road surface of the road section, and specifically, the classification is made according to the different materials of the road surface constituting the road section, such as asphalt pavement, concrete pavement, gravel pavement, pebble pavement, sand pavement, and earth road, etc. The road sections of different first road surface types have different influences on the resistance of the vehicle.

[0076] In addition, the external environment also affects the resistance of the road section to the vehicle. For example, the resistance of the same vehicle on a sand pavement road section in sunny weather is greater than the road surface resistance of the vehicle on a sand pavement road section in rainy weather, that is, the resistance coefficient corresponding to the dry sand pavement road section is greater than the resistance coefficient corresponding to the wet sand pavement road section.

[0077] Therefore, in order to accurately obtain the resistance coefficient corresponding to at least one road section in the navigation route of the vehicle, and accurately obtain the road surface resistance of the vehicle on the road section, the first road surface type and the current weather information of the road section need to be obtained first. The current weather information includes rainy weather, sunny weather, and snowy weather, etc.

[0078] In a specific implementation, the first road surface type and the current weather information of the road section (one or more) can be directly obtained through the vehicle-mounted navigation.

[0079] In step S12, the second road surface type of the road section is determined based on the first road surface type and the current weather information.

[0080] Once the first road surface type and current weather information for a road segment are obtained, the second road surface type can be determined. The second road surface type represents the road surface type that the road segment exhibits after being affected by weather. For example, if the first road surface type of a road segment is gravel road and the current weather information is rainy, then the second road surface type of the road segment is wet gravel road; if the first road surface type of a road segment is gravel road and the current weather information is sunny, then the second road surface type of the road segment is dry gravel road.

[0081] In practice, in addition to obtaining the current weather information, the weather conditions of the road segment 1-2 hours prior can also be obtained to determine the second road surface type. For example, according to the vehicle navigation, the first road surface type of the road segment is determined to be gravel road. The current weather information is cloudy, and the weather conditions of the road segment 1 hour ago were rainy. Therefore, the second road surface type of the road segment is determined to be wet gravel road.

[0082] Step S13: Based on the second road surface type, determine the resistance coefficient corresponding to the road segment.

[0083] After determining the second pavement type of a road segment, the corresponding drag coefficient can be determined. The drag coefficients corresponding to road segments with different second pavement types are shown in Table 1 below:

[0084] Table 1. Road sections with different second pavement types and their corresponding resistance coefficients

[0085]

[0086] After determining the second pavement type of the road segment, the corresponding resistance coefficient can be directly determined according to Table 1 above. Since the resistance coefficients shown in Table 1 are range values, to facilitate subsequent pavement resistance calculations, after determining the range of resistance coefficients for the road segment from Table 1, the average of this range is taken as the resistance coefficient for that road segment. For example, the range of resistance coefficients for a muddy road segment is 0.100-0.250, therefore the resistance coefficient for that road segment is 0.175.

[0087] If the navigation route has multiple segments, the resistance coefficient for each segment is obtained separately.

[0088] After determining the drag coefficient for a road segment, the road surface resistance of the vehicle on that segment can be determined based on the determined drag coefficient. See the following for details. Figure 3 , Figure 3 A flowchart illustrating the steps of a method for determining the road surface resistance of a vehicle on a road segment, as described in an embodiment of this application, is shown. Figure 3 As shown, the steps include:

[0089] Step S21, obtaining the gravity of the vehicle.

[0090] In order to avoid the influence of the gravity of the vehicle caused by the driving of the vehicle, the embodiment of the application measures the gravity of the vehicle before the vehicle drives. Specifically, the mass of the vehicle can be obtained by the gravity sensor, and the gravity of the vehicle is determined according to the obtained mass of the vehicle.

[0091] Wherein, the gravity of the vehicle can be determined by the following formula (I):

[0092] G = m * g formula (I)

[0093] Wherein, G represents the gravity of the vehicle; m represents the mass of the vehicle; g represents the ratio of gravity to mass, which is 9.8 N / kg.

[0094] Wherein, it should be noted that the mass of the vehicle in the embodiment of the application includes the mass of the vehicle, the people and objects carried by the vehicle, and accordingly, the gravity of the vehicle in the embodiment of the application also includes the gravity of the vehicle, the people and objects carried by the vehicle.

[0095] Step S22, determining the road surface resistance of the vehicle on the road section based on the gravity and the resistance coefficient.

[0096] After the gravity of the vehicle and the resistance coefficient corresponding to at least one road section in the navigation route are determined, the road surface resistance of the vehicle on the road section can be determined based on the gravity and the resistance coefficient. Specifically, the road surface resistance can be determined by the following formula (II):

[0097] Fp = G * f formula (II)

[0098] Wherein, Fp represents the road surface resistance of the vehicle on the road section; G represents the gravity of the vehicle; f represents the resistance coefficient corresponding to the road section.

[0099] Wherein, if the navigation route has multiple road sections, the road surface resistance of the vehicle on each road section is determined based on the resistance coefficient corresponding to the different road sections.

[0100] After the road surface resistance of the vehicle on the road section is determined, the driving speed of the vehicle on the road section can be determined based on the road surface resistance and the air resistance of the vehicle on the road section, which is specifically referred to Figure 4 , Figure 4 The step flow chart of another method for determining the driving speed according to the embodiment of the application is shown in FIG. 3, which includes the following steps: Figure 4

[0101] Step S31, determining the critical driving speed of the vehicle on the road section based on the road surface resistance and the air resistance.

[0102] ​The air resistance refers to the air resistance that the vehicle receives when the vehicle travels at a low fuel consumption or low power traveling speed, that is, the air resistance of the vehicle on the road section does not exceed the road surface resistance. Therefore, when the road surface resistance of the vehicle on the road section is determined, the maximum air resistance of the vehicle on the road section in the case of saving fuel or power as much as possible is determined, and based on the maximum air resistance, the traveling speed corresponding to the maximum air resistance can be determined, that is, the critical traveling speed of the vehicle on the road section.

[0103] If the navigation route has multiple road sections, the maximum air resistance of the vehicle on each road section is determined based on the road surface resistance of each road section, and thus the critical traveling speed of the vehicle on each road section is determined.

[0104] Step S32, the traveling speed of the vehicle on the road section is determined to be a speed less than or equal to the critical traveling speed.

[0105] After the critical traveling speed of the vehicle on the road section is determined, the traveling speed of the vehicle on the road section is determined to be a speed less than or equal to the critical traveling speed, so that the vehicle can travel at a low fuel consumption or low power traveling speed, thereby assisting green travel.

[0106] The step of determining the critical traveling speed corresponding to the vehicle based on the road surface resistance and the air resistance can refer to Figure 5 , Figure 5 A step flow chart of a method for determining a critical traveling speed according to an embodiment of the application is shown in FIG. 3. Figure 5 The steps include:

[0107] Step S311, the wind area and wind resistance coefficient of the vehicle are obtained, and the environmental information of the vehicle is obtained.

[0108] The wind area and wind resistance coefficient of the vehicle are factory-set and can be directly obtained.

[0109] The environmental information represents the air density in the environment where the vehicle is located.

[0110] Step S312, the function relationship between the air resistance and the corresponding traveling speed is determined based on the wind area, the wind resistance coefficient and the environmental information.

[0111] The relationship between the air resistance and the wind area, the wind resistance coefficient and the environmental information can be determined by the following formula (three):

[0112] Fw=1 / 2*ρ*S*Cw*v 2 Formula (three)

[0113] Where Fw represents the air resistance of the vehicle on a certain road segment; ρ represents the environmental information of the vehicle, i.e., air density; S represents the frontal area of ​​the vehicle; Cw represents the drag coefficient of the vehicle; and v represents the speed of the vehicle.

[0114] Based on Formula 3 above, once the vehicle's frontal area, drag coefficient, and environmental information are determined, the functional relationship between air resistance and its corresponding speed can be established. For example, the determined frontal area is 2.4m². 2 Given a drag coefficient of 0.32 and an air density of 1.185 kg / m³, the functional relationship between air resistance and the corresponding driving speed is: Fw = 0.455 * v 2 .

[0115] Step S313: Based on the functional relationship, the driving speed corresponding to the air resistance when the air resistance equals the road resistance is determined as the critical driving speed.

[0116] After determining the functional relationship between air resistance and its corresponding driving speed, the maximum air resistance that the vehicle experiences on that road segment can be determined while saving as much fuel or electricity as possible. This maximum air resistance is equal to the road surface resistance of the vehicle on that road segment. Therefore, based on the determined functional relationship, the driving speed corresponding to the maximum air resistance can be determined, which is the critical driving speed of the vehicle on that road segment.

[0117] The steps for obtaining information about the vehicle's environment can be referred to... Figure 6 , Figure 6 A flowchart illustrating the steps for obtaining environmental information according to an embodiment of this application is shown, as follows: Figure 6 As shown, the steps include:

[0118] Step S3111: Obtain the air pressure and temperature of the environment in which the vehicle is located.

[0119] The air pressure can be obtained directly from the vehicle's air pressure gauge; the temperature can be obtained from the vehicle's navigation system, or an additional temperature sensor can be installed on the vehicle to detect and obtain the temperature of the environment in which the vehicle is located.

[0120] Step S3112: Determine the environmental information based on the air pressure and the temperature.

[0121] After obtaining the temperature of the environment in which the vehicle is located, the absolute temperature of the environment in which the vehicle is located can be determined using the following formula (iv):

[0122] Absolute temperature = Temperature + 273.15 (Formula 4)

[0123] When the air pressure and absolute temperature in the environment where the vehicle is located are obtained, the environmental information can be determined by the following formula (five):

[0124] ρ = 1.293 * (air pressure / standard physical atmospheric pressure) * (273.15 / absolute temperature) formula (five)

[0125] Wherein, ρ represents the environmental information of the vehicle, i.e. air density; the standard physical atmospheric pressure is 101.325kPa.

[0126] Thus, when the air pressure and temperature in the environment where the vehicle is located are obtained, the environmental information of the vehicle can be determined by the above formula four and formula five.

[0127] In an alternative embodiment, based on the road resistance and the obtained air resistance of the vehicle on the road section, the driving speed of the vehicle on the road section is determined, and the determination method further comprises:

[0128] Before the vehicle drives into the road section, the determined driving speed is sent to the car machine to instruct the user to trigger the control instruction;

[0129] In response to the triggering of the control instruction, the vehicle is controlled to drive on the road section at the determined driving speed.

[0130] When the driver sets a navigation route on the vehicle navigation, the driving speed of the vehicle on all road sections (excluding highway sections) in the navigation route can be determined through the above steps S1-S3. Therefore, before the vehicle drives into a road section, the determined driving speed of the vehicle on the road section can be sent to the car machine, and the car machine displays the driving speed, prompting the user to drive at the above driving speed to save the energy consumption of the whole vehicle. Referring to Figure 7 , Figure 7 A display diagram of the driving speed according to the embodiment of the application is shown, as shown in Figure 7 The most energy-saving driving speed of the vehicle on a certain road section is 63km / h, and in the specific implementation, the vehicle can save the energy consumption of the whole vehicle when driving at a speed not exceeding 63km / h.

[0131] When the user determines to drive at the above driving speed, the control instruction will be triggered, and in response to the triggering of the control instruction, the vehicle is controlled to drive on the road section at the determined driving speed. Thus, the vehicle drives at a low fuel consumption or low power consumption speed, saving the energy consumption of the whole vehicle.

[0132] In the specific implementation, the driving speed of the vehicle can also be controlled to be less than the above determined driving speed.

[0133] In addition, when the vehicle enters the next road section, the vehicle machine will display the driving speed of the vehicle on the road section, so that the vehicle continues to drive at a low fuel consumption or low power consumption speed, greatly saving the energy consumption of the whole vehicle, and helping green travel.

[0134] The embodiment of the present application determines the road surface resistance of the vehicle on the road section by determining the resistance coefficient corresponding to at least one road section in the navigation route of the vehicle, and determines the driving speed of the vehicle on the road section based on the road surface resistance and the air resistance, which meets the fuel-saving speed interval or the power-saving speed interval of the vehicle, so that the vehicle can drive at a low fuel consumption or low power consumption speed, saving the energy consumption of the whole vehicle, and helping green travel.

[0135] Next, the present application will be exemplarily described in combination with specific examples:

[0136] Embodiment one

[0137] The user drives the vehicle to the city for work (the mass of the vehicle is 960 kg before the vehicle drives), sets a navigation route in the vehicle system, and obtains that the navigation route has only one road section according to the vehicle navigation, and that the first road surface type of the road section is asphalt pavement, and that the current weather information is sunny weather, so that the second road surface type of the road section is good asphalt pavement, and therefore according to Table 1, the resistance coefficient corresponding to the road section is 0.014, so that the road surface resistance of the vehicle on the road section can be determined according to Formula (I) and Formula (II) as 131.712 N.

[0138] The atmospheric pressure of the environment where the vehicle is located is obtained by the vehicle air pressure gauge as standard atmospheric pressure, and the temperature of the environment where the vehicle is located is obtained by the vehicle navigation as 25°C, so that the environmental information of the vehicle is determined according to Formula (IV) and Formula (V), i.e. the air density is 1.185 kg / m³.

[0139] Based on the obtained road surface resistance, environmental information, the windward area (2.4 m 2 ) of the vehicle itself, the wind resistance coefficient (0.32), and the function relationship between the air resistance and the corresponding driving speed determined by Formula (III) is Fw=0.455*v 2 . Based on the function relationship, when the air resistance is equal to the road surface resistance, the driving speed corresponding to the air resistance is determined as the critical driving speed, and the critical driving speed is 17.01 m / s, i.e. 61.24 km / h. Then, the driving speed of the vehicle on the road section is determined as a speed less than or equal to the critical driving speed, i.e. less than or equal to 61.24 km / h.

[0140] Embodiment two

[0141] The user drives the vehicle to a neighboring city for a trip (the mass of the vehicle is obtained as 1100kg before the vehicle travels), formulates a navigation route in the vehicle system, obtains a first road surface type of a road section in the navigation route as a mud road surface according to the vehicle navigation, and obtains current weather information as a rainy day, so as to determine a second road surface type of the road section as a pothole road surface, and thus it can be known from Table 1 that the corresponding resistance coefficient of the road section is 0.0425, so as to determine the road surface resistance of the vehicle on the road section as 458.15N according to Formula (1) and Formula (2).

[0142] The air pressure in the environment where the vehicle is located is obtained as 91.21kPa through the vehicle air pressure gauge, and the temperature in the environment where the vehicle is located is obtained as 18℃ according to the vehicle navigation, so as to determine the environmental information of the vehicle according to Formula (4) and Formula (5), that is, the air density is 1.092kg / m3.

[0143] Based on the obtained road surface resistance, environmental information, the windward area (3m 2 ) of the vehicle itself, the wind resistance coefficient (0.32), and the function relationship between the air resistance and the corresponding driving speed determined according to Formula (3) is Fw=0.524*v 2 . Based on the function relationship, when the air resistance is equal to the road surface resistance, the corresponding driving speed of the air resistance is determined as the critical driving speed, and the critical driving speed is obtained as 29.56m / s, that is, 106.42km / h. Then, the driving speed of the vehicle on the road section is determined as a speed less than or equal to the critical driving speed, that is, less than or equal to 106.42km / h.

[0144] Based on the same application concept, the embodiment of the present application also proposes a driving speed determination device, which is specifically described with reference to Figure 8 , Figure 8 The structure of the driving speed determination device is shown in the structure schematic diagram of the driving speed determination device according to the embodiment of the present application, as shown in the figure, the determination device 1 comprises: Figure 8

[0145] The first determination unit 101 determines the resistance coefficient corresponding to at least one road section in the navigation route of the vehicle, and the resistance coefficient is used to represent the influence degree of the road section on the vehicle.

[0146] ​When the driver sets a navigation route for the vehicle in the vehicle navigation, the first determining unit 101 can determine the resistance coefficient corresponding to at least one road section in the navigation route. In specific implementation, if the navigation route set by the driver has only one road section, the resistance coefficient corresponding to this road section is determined; if there are multiple road sections, the resistance coefficients corresponding to these road sections are determined respectively. Specifically, according to the vehicle navigation, the road sections of the navigation route can be determined. For example, according to the vehicle navigation, it is determined that the road sections on the navigation route are all the same road sections, such as asphalt road sections, and then the first determining unit 101 determines the resistance coefficient corresponding to the asphalt road section. For another example, according to the vehicle navigation, it is determined that the road sections on the navigation route are two, such as asphalt road sections and gravel road sections, and then the first determining unit 101 determines the resistance coefficient corresponding to the asphalt road section and the resistance coefficient corresponding to the gravel road section.

[0147] The second determining unit 102 is configured to determine the road surface resistance of the vehicle on the road section based on the resistance coefficient.

[0148] When the first determining unit 101 determines the resistance coefficient corresponding to the road section, the second determining unit 102 can determine the road surface resistance of the vehicle on the road section based on the determined resistance coefficient. In specific implementation, if the navigation route set by the driver has only one road section, the first determining unit 101 determines the resistance coefficient corresponding to this road section, and the second determining unit 102 determines the road surface resistance of the vehicle on this road section based on the determined resistance coefficient; if the navigation route set by the driver has multiple road sections, the first determining unit 101 determines the resistance coefficients corresponding to these road sections respectively, and the second determining unit 102 determines the road surface resistances of the vehicle on the corresponding road sections based on the resistance coefficients.

[0149] The third determining unit 103 is configured to determine the driving speed of the vehicle on the road section based on the road surface resistance and the obtained air resistance of the vehicle on the road section.

[0150] The air resistance refers to the air resistance of the vehicle when the vehicle travels at a low fuel consumption or low power consumption driving speed, that is, the air resistance of the vehicle on the road section does not exceed the road surface resistance. Therefore, when the road surface resistance of the vehicle on the road section is determined, the air resistance of the vehicle on the road section is also determined, and the third determining unit 103 can determine the driving speed of the vehicle on the road section based on the determined air resistance, which meets the fuel-saving speed interval or the power-saving speed interval of the vehicle, so that the vehicle can travel at a low fuel consumption or low power consumption speed, save the energy consumption of the whole vehicle, and help green travel.

[0151] In specific implementation, as long as the actual driving speed of the vehicle on the road section does not exceed the determined driving speed, the energy consumption of the whole vehicle can be saved.

[0152] In addition, it should be noted that the road segments in the embodiments of the present application do not include highway segments.

[0153] Based on the same application concept, the embodiments of the present application further provide a computer readable storage medium for storing a computer program for executing the determination method.

[0154] Based on the same application concept, the embodiments of the present application further provide a vehicle, which comprises a control module for implementing the determination method.

[0155] Each of the embodiments in the present specification is described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts between the embodiments can be referred to each other.

[0156] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, device, or computer program product. Therefore, the embodiments of the present application can be in the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the embodiments of the present application can be in the form of a computer program product implemented on one or more computer usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program code.

[0157] The embodiments of the present application are described with reference to flowcharts and / or block diagrams according to the method, terminal device (system), and computer program product of the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of the flows and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing terminal device to produce a machine, so that the instructions executed by the computer or other programmable data processing terminal device produce a device that implements the functions specified in the flowcharts and / or block diagrams. Figure 1 The functions specified in one flow or multiple flows and / or blocks Figure 1 The functions specified in one flow or multiple flows and / or blocks

[0158] These computer program instructions can also be stored in a computer readable storage medium that can guide the computer or other programmable data processing terminal device to work in a specific way, so that the instructions stored in the computer readable storage medium produce a product including instruction devices that implement the functions specified in the flowcharts and / or block diagrams. Figure 1 The functions specified in one flow or multiple flows and / or blocks Figure 1 The functions specified in one flow or multiple flows and / or blocks

[0159] These computer program instructions can also be loaded into a computer or other programmable data processing terminal device, so that a series of operational steps are performed on the computer or other programmable terminal device to generate a computer implemented process, so that the instructions executed on the computer or other programmable terminal device provide a process for implementing the functions specified in the flowchart block or blocks. Figure 1 These computer program instructions can also be loaded into a computer or other programmable data processing terminal device, so that a series of operational steps are performed on the computer or other programmable terminal device to generate a computer implemented process, so that the instructions executed on the computer or other programmable terminal device provide a process for implementing the functions specified in the flowchart block or blocks. Figure 1 These computer program instructions can also be loaded into a computer or other programmable data processing terminal device, so that a series of operational steps are performed on the computer or other programmable terminal device to generate a computer implemented process, so that the instructions executed on the computer or other programmable terminal device provide a process for implementing the functions specified in the flowchart block or blocks.

[0160] Although preferred embodiments of the application have been described, those skilled in the art will appreciate that other alterations and modifications are possible without departing from the basic inventive concept. Accordingly, the appended claims are intended to embrace all alterations and modifications that come within the scope of the application.

[0161] Finally, it should be noted that the terms "first" and "second" and the like are used merely to distinguish one entity or action from another, without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0162] The above detailed description of the technical solutions provided by the application has been described in detail, and the principles and implementation modes of the application have been described by applying specific examples. The above description of the embodiments is only used to help understand the application, and the content of the description should not be understood as limiting the application. Meanwhile, for those skilled in the art, according to the application, there will be different forms of changes in specific implementation modes and application ranges, which do not need and cannot be exhausted here, and the obvious changes or changes derived therefrom are still within the protection scope of the application.

Claims

1. A method of determining a travel speed, characterized by, The determination method comprises: determining a resistance coefficient corresponding to at least one road section in a navigation route of a vehicle, the resistance coefficient being used to represent an influence degree of the road section on resistance of the vehicle; based on the resistance coefficient, determining a road surface resistance of the vehicle on the road section; based on the road surface resistance and an air resistance of the vehicle on the road section, determining a driving speed of the vehicle on the road section; the determination of the driving speed of the vehicle on the road section based on the road surface resistance and the air resistance of the vehicle on the road section comprises: based on the road surface resistance and the air resistance, determining a critical driving speed of the vehicle on the road section; determining the driving speed of the vehicle on the road section as a speed less than or equal to the critical driving speed; the determination of the critical driving speed of the vehicle based on the road surface resistance and the air resistance comprises: obtaining a windward area and an air resistance coefficient of the vehicle, and environmental information of the vehicle; based on the windward area, the air resistance coefficient and the environmental information, determining a function relationship between the air resistance and a corresponding driving speed thereof; based on the function relationship, determining the corresponding driving speed of the air resistance as the critical driving speed when the air resistance is equal to the road surface resistance.

2. The travel speed determination method according to claim 1, characterized by, The determination of the resistance coefficient corresponding to at least one road section in the navigation route of the vehicle comprises: obtaining a first road surface type and current weather information of the road section; based on the first road surface type and the current weather information, determining a second road surface type of the road section; based on the second road surface type, determining the resistance coefficient corresponding to the road section.

3. The travel speed determination method according to claim 1, characterized by, The determination of the road surface resistance of the vehicle on the road section based on the resistance coefficient comprises: obtaining a gravity of the vehicle; based on the gravity and the resistance coefficient, determining the road surface resistance of the vehicle on the road section.

4. The travel speed determination method according to claim 1, characterized by The obtaining of the environmental information comprises: obtaining air pressure and temperature in an environment where the vehicle is located; based on the air pressure and the temperature, determining the environmental information.

5. The travel speed determination method according to claim 1, characterized by After the determination of the driving speed of the vehicle on the road section based on the road surface resistance and the air resistance of the vehicle on the road section, the determination method further comprises: before the vehicle drives into the road section, sending the determined driving speed to a car machine to instruct a user to trigger a control instruction; in response to the triggering of the control instruction, controlling the vehicle to drive on the road section at the determined driving speed.

6. A device for determining a driving speed, characterized in that The determination device comprises: a first determination unit for determining a resistance coefficient corresponding to at least one road section in a navigation route of a vehicle, the resistance coefficient being used to represent an influence degree of the road section on resistance of the vehicle; a second determination unit for determining a road surface resistance of the vehicle on the road section based on the resistance coefficient; The third determining unit is configured to determine the driving speed of the vehicle on the road section based on the road surface resistance and the obtained air resistance of the vehicle on the road section, and the determining the driving speed of the vehicle on the road section based on the road surface resistance and the obtained air resistance of the vehicle on the road section comprises: determining a critical driving speed of the vehicle on the road section based on the road surface resistance and the air resistance; determining the driving speed of the vehicle on the road section as a speed less than or equal to the critical driving speed; and the determining the corresponding critical driving speed of the vehicle based on the road surface resistance and the air resistance comprises: obtaining the windward area and the air resistance coefficient of the vehicle and environmental information of the vehicle; determining a function relationship between the air resistance and the corresponding driving speed based on the windward area, the air resistance coefficient and the environmental information; and determining the corresponding driving speed of the air resistance when the air resistance is equal to the road surface resistance as the critical driving speed based on the function relationship.

7. A computer readable storage medium characterized by The computer readable storage medium is configured to store a computer program for executing the method for determining the driving speed according to any one of claims 1-5.

8. A vehicle characterized by comprising: The vehicle comprises a control module configured to implement the method for determining the driving speed according to any one of claims 1-5.

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