WO2018233702A1 - Method and device for estimating remaining range of transportation means having power supply system - Google Patents

Abstract

Provided are a method and device for estimating a remaining range of a transportation means having a power supply system. The method comprises the following steps: detecting a vehicle parameter of a transportation means having a power supply system, road surface information and a driving mode; acquiring, according to the vehicle parameter, the road surface information and the driving mode, and from a range storage database, a corresponding range storage value; and calculating a remaining range according to the acquired range storage value. In the method and device, modification of an endurance range value is made according to a result of detection of a current driving condition of a transportation means having a power supply system, such that an estimated remaining range has higher accuracy, thereby enabling a user to make a driving route decision conveniently, alleviating range anxiety, and accordingly improving user experience.

Description

Method and device for estimating remaining mileage of vehicle with power supply system Technical field

The present invention relates to the field of vehicle control technology with a power supply system, and more particularly to a method and apparatus for estimating a remaining mileage of a vehicle having a power supply system.

Background technique

The driving range of a vehicle with a power supply system refers to the mileage traveled by the vehicle with the power supply system from the full state of the power battery to the end of the standard specified test. The remaining mileage refers to the mileage that the car can travel while maintaining the current driving style under the current conditions. Since the vehicle with the power supply system cannot achieve fast charging, the accuracy of the remaining mileage calculation of the vehicle with the power supply system is particularly important.

At present, the calculation of the remaining mileage of the vehicle with the power supply system is calculated by the host factory on the standard road surface. The road state, wind speed and traffic congestion of the vehicle with the power supply system will make the vehicle consume different energy, so the vehicle driving environment The complexity affects the accuracy of the calculation of the remaining mileage of the vehicle with the power supply system. This is the complexity of the user's driving road conditions, and the remaining mileage displayed by the meter often makes the user feel ill, greatly reducing the user experience. Moreover, most of the existing cruising range estimation methods are based on the actual mileage of the previous driving cycle for statistical analysis, and the complexity of the road conditions and the driver's driving style often make the accuracy of the remaining mileage estimation less.

Summary of the invention

The technical problem to be solved by the present invention is to provide a method and a device for estimating the remaining mileage of a vehicle with a power supply system, which can correct the current driving condition of the vehicle with the power supply system, correct the cruising range value, and improve the accuracy of the remaining mileage estimation. Sexuality makes it easy for users to make driving decisions and ease mileage anxiety, thus improving the user experience.

In order to solve the above technical problem, the present invention provides a method for estimating a remaining mileage of a vehicle having a power supply system, comprising the following steps:

Detecting vehicle parameters, road information, and driving modes of a vehicle having a power supply system;

Obtaining a corresponding mileage storage value from the mileage storage database according to the vehicle parameter, the road surface information, and the driving mode;

The remaining mileage is calculated based on the acquired mileage storage value.

Further, the driving mode includes one or more of a low speed mode, a medium speed mode, a medium speed mode, and a high speed mode.

Further, the driving mode further includes dividing the driving mode of each speed section into an acceleration mode, a deceleration mode, a constant speed mode, and an idle mode according to the vehicle speed and the acceleration, wherein:

The acceleration mode is a driving mode in which the vehicle speed is greater than 0 and the acceleration is greater than 0;

The deceleration mode is a driving mode in which the vehicle speed is greater than 0 and the acceleration is less than 0;

The constant speed mode is a driving mode in which the vehicle speed is greater than 0 and the acceleration is equal to 0;

The idle mode is a driving mode in which the vehicle speed is equal to 0 and the acceleration is equal to 0.

Further, the method further includes:

Establish a mileage storage database for each driving mode, including:

The state of charge SOC of the battery pack is divided into N SOC sections, which are respectively a first section, a second section, an Nth section, where N is an integer greater than 2;

The vehicle parameter information, the road surface information, the driving mode information, and the section mileage storage value corresponding to each section are stored for each section.

Further, the calculation method of the interval mileage storage value is:

Collecting a vehicle speed signal of a vehicle having a power supply system;

If the vehicle speed signal is valid, the vehicle speed is integrated from the current SOC interval start time to the current SOC interval end time, and the corresponding interval mileage storage value is obtained;

If the vehicle speed signal is invalid, the vehicle speed is obtained by multiplying the motor speed by the main reduction ratio, and then integrating the time from the current SOC interval start time to the current SOC interval end time to obtain the corresponding interval mileage storage value.

Further, the method further includes:

Updating the mileage storage database specifically includes:

The mileage storage value of each SOC interval is used as a reference value of the next driving cycle;

When the vehicle is powered on again, the section where the SOC belongs is detected. If the current SOC is on the section dividing node, the mileage is calculated until the section ends, to obtain the mileage calculation value of the SOC section, and the mileage calculation value is updated according to the SOC section mileage calculation value. The mileage storage value of the SOC interval;

If the current SOC is not on the interval division node, the SOC interval does not update the interval mileage storage value until the next SOC interval is divided into nodes, and the mileage is calculated until the interval ends, and the SOC interval mileage calculation value is obtained, according to the SOC interval. The mileage calculation value updates the mileage storage value of the SOC interval.

Further, the updated mileage storage value includes:

When the SOC enters a certain interval, the mileage is calculated until the end of the interval, and the calculated mileage of the SOC interval is calculated;

The SOC interval mileage calculation value is subtracted from the interval value of the previous driving cycle. If the difference is greater than 0 and greater than the set threshold, the mileage value of the interval of the previous driving cycle is added to the threshold value. Updated to the mileage storage value corresponding to the SOC interval;

If the difference is less than 0, and the absolute value is greater than the set threshold, the mileage value of the interval of the previous driving cycle is subtracted from the threshold, and updated to the mileage storage value of the corresponding SOC interval;

If the absolute value of the difference is less than or equal to the set threshold, the SOC interval mileage calculation value is updated to the mileage storage value of the corresponding SOC interval.

Further, each driving mode corresponds to a threshold, and the threshold is calculated by: in each driving mode, the N SOC interval mileage calculation value is subtracted from the corresponding previous driving cycle in one driving cycle of the vehicle. The difference between the mileage values, the vehicle M driving cycle obtains M×N difference values, and the absolute values of M×N difference values are averaged, then the threshold value in the corresponding driving mode is obtained, where M is a positive integer. .

Further, the vehicle parameters include a power battery SOC, an air conditioning state, a throttle, a gear position, a brake, and/or a vehicle speed information, and the road surface information includes a road surface state and/or a road surface gradient.

Further, calculating the remaining mileage specifically includes:

The mileage value of the current SOC interval is linearly interpolated for the SOC point in the interval, and the mileage value of the SOC point in the SOC interval is obtained, and the mileage value of the current SOC point and the interval mileage value below the interval are added to obtain the remaining Mileage S.

Further, the vehicle speed in the low speed mode is 0-30 km/h, the speed in the medium speed mode is 30-60 km/h, the speed in the medium speed mode is 60-90 km/h, and the speed in the high speed mode is 90 km/h or more.

According to another aspect of the present invention, a vehicle remaining mileage estimating apparatus having a power supply system is provided, the apparatus comprising:

a detecting module, configured to detect vehicle parameters, road information, and driving mode of a vehicle having a power supply system;

a data acquisition module, configured to acquire a corresponding mileage storage value from the mileage storage database according to the vehicle parameter, the road surface information, and the driving mode;

The remaining mileage calculation module is configured to calculate the remaining mileage based on the acquired mileage storage value.

Further, the device further includes a driving module dividing module, and the driving mode dividing module divides the driving mode into one or more of a low speed mode, a medium speed mode, a medium speed mode, and a high speed mode.

Further, the driving module dividing module further divides each of the medium speed mode, the medium speed mode, and the high speed mode into an acceleration mode, a deceleration mode, and a constant speed mode according to a vehicle speed and an acceleration magnitude, and the low speed mode further Divided into acceleration mode, deceleration mode, constant speed mode, and idle mode, wherein

The acceleration mode is a driving mode in which the vehicle speed is greater than 0 and the acceleration is greater than 0;

The deceleration mode is a driving mode in which the vehicle speed is greater than 0 and the acceleration is less than 0;

The constant speed mode is a driving mode in which the vehicle speed is greater than 0 and the acceleration is equal to 0;

The idle mode is a driving mode in which the vehicle speed is equal to 0 and the acceleration is equal to 0.

Further, the apparatus further includes a database establishing module for establishing a mileage storage database in each driving mode.

Further, the database establishing module includes:

The SOC section dividing unit is configured to divide the state of charge SOC of the battery pack into N SOC sections, and is respectively a first section, a second section, an Nth section, where N is an integer greater than 2;

The data storage unit is configured to store vehicle parameter information, road surface information, driving mode information, and a range mileage storage value corresponding to each section for each section.

Further, the database establishing module further includes a section mileage storage value calculation unit,

The interval mileage storage value calculation unit is configured to collect a vehicle speed signal of a vehicle having a power supply system, and calculate a range mileage storage value, specifically:

If the vehicle speed signal is valid, the vehicle speed is integrated from the current SOC interval start time to the current SOC interval end time, and the corresponding interval mileage storage value is obtained;

If the vehicle speed signal is invalid, the vehicle speed is obtained by multiplying the motor speed by the main reduction ratio, and then integrating the time from the current SOC interval start time to the current SOC interval end time to obtain the corresponding interval mileage storage value.

Further, the device further includes a database update module, configured to update the mileage storage database;

The database update module includes:

An initialization unit, configured to use the mileage storage value of each SOC interval as a reference value of the next driving cycle;

The mileage storage value updating unit is configured to detect a section to which the SOC belongs when the vehicle is powered on again, and if the current SOC is on the section dividing node, start calculating the mileage until the interval ends, to obtain the mileage calculation value of the SOC section, according to the The SOC interval mileage calculation value updates the mileage storage value of the SOC interval;

If the current SOC is not on the interval division node, the SOC interval does not update the interval mileage storage value until the next SOC interval is divided into nodes, and the mileage is calculated until the interval ends, and the SOC interval mileage calculation value is obtained, according to the SOC interval. The mileage calculation value updates the mileage storage value of the SOC interval.

Further, the mileage storage value update unit includes:

The SOC interval mileage calculation sub-unit is configured to start calculating the mileage when the SOC enters a certain interval, until the end of the interval, and calculate the mileage calculation value of the SOC interval;

The SOC interval mileage value correcting subunit is configured to subtract the mileage value of the SOC interval from the mileage value of the previous driving cycle, and if the difference is greater than 0 and greater than the set threshold, the interval of the previous driving cycle is The mileage value is added to the threshold value, and is updated to a mileage storage value corresponding to the SOC interval;

If the difference is less than 0, and the absolute value is greater than the set threshold, the mileage value of the interval of the previous driving cycle is subtracted from the threshold value, and updated to the mileage storage value of the corresponding SOC interval;

If the absolute value of the difference is less than or equal to the set threshold, the SOC interval mileage calculation value is updated to the mileage storage value of the corresponding SOC interval.

Further, the mileage storage value update unit further includes a threshold calculation subunit for calculating a threshold corresponding to each driving mode, specifically: in each driving mode, the vehicle obtains N SOC interval mileage in one driving cycle. Calculate the difference from the corresponding mileage value of the previous driving cycle, obtain M × N difference values for the M driving cycles, and average the absolute values of M × N differences to obtain the corresponding driving. The threshold in mode, where M is a positive integer.

Further, the mileage information acquiring module further includes an information collecting unit, configured to collect vehicle location information, acquire current vehicle parameters and actual traffic condition information of the vehicle having the power supply system in real time, and determine a driving mode of the vehicle;

The vehicle parameters include a power battery SOC, an air conditioning state, a throttle, a gear position, a brake, and/or vehicle speed information, the road surface information including a road surface condition and/or a road surface gradient.

Further, the remaining mileage calculation module is further configured to: perform a linear interpolation calculation on the SOC point of the current SOC interval for the SOC point in the interval, obtain a mileage value of the SOC point in the SOC interval, and obtain a mileage value of the current SOC point. Add the remaining mileage S to the interval mileage value below the interval.

Further, the vehicle speed in the low speed mode is 0-30 km/h, the speed in the medium speed mode is 30-60 km/h, the speed in the medium speed mode is 60-90 km/h, and the speed in the high speed mode is 90 km/h or more.

In accordance with still another aspect of the present invention, a remote server is provided for receiving vehicle vehicle parameters, road surface information, and driving mode information, and establishing a mileage storage database for each driving mode.

Further, the remote server receives the target location information, and generates driving mode information and best recommended path information according to the vehicle parameters of the vehicle currently having the power supply system.

According to still another aspect of the present invention, there is provided a vehicle remaining mileage estimating system having a power supply system, the system comprising a remaining mileage estimating device and a remote server, the remaining mileage estimating device being connected to the remote end via an in-vehicle network The server interacts.

According to yet another aspect of the present invention, a computer readable storage medium is provided, the storage medium comprising a plurality of instructions that are executed by a processor in the steps of the method.

The present invention has significant advantages and advantageous effects over the prior art. With the above technical solution, the method and device for estimating the remaining mileage of the vehicle with the power supply system can achieve considerable technical progress and practicability, and has extensive industrial use value, and at least has the following advantages:

The method and device of the invention can detect the current driving mode of the vehicle with the power supply system, correct the cruising range value, obtain the mileage information according to the corresponding driving mode, the vehicle parameter and the road information, improve the accuracy of the remaining mileage estimation, and facilitate the user. Make a decision on the driving path and ease the mileage anxiety, thus improving the user experience.

The above description is only an overview of the technical solutions of the present invention, and the above-described and other objects, features and advantages of the present invention can be more clearly understood. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments will be described in detail with reference to the accompanying drawings.

DRAWINGS

1 is a flowchart of a method for estimating a remaining mileage of a vehicle with a power supply system according to an embodiment of the present invention;

2 is a schematic diagram of SOC interval division according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a device for estimating a remaining mileage of a vehicle with a power supply system according to an embodiment of the present invention.

Detailed ways

The examples described below in conjunction with the figures are intended to convey the present invention in its entirety and in its entirety. Units, modules, elements and/or steps not expressly described herein may also be included in accordance with the technical aspects of the present invention _. Vehicles with power supply systems in different driving modes have different energy consumption per kilometer, so the cruising range of vehicles with power supply systems under the same SOC (State of Charge) state is not the same. In order to accurately estimate the remaining mileage, the present invention performs residual mileage estimation for vehicle parameters, road information, and driving modes of different vehicles having a power supply system to improve the accuracy of the remaining mileage estimation of the vehicle with the power supply system.

The vehicle having the power supply system includes an electric vehicle and a hybrid vehicle, and the method and system of the present invention are used to estimate the pure electric cruising range of the electric vehicle and the hybrid vehicle, and output to the user in an appropriate manner, for example, through the meter. The disk is displayed to the user.

The following embodiments are described with an electric vehicle as an example of a vehicle having a power supply system, but a vehicle having a power supply system is not limited to an electric vehicle.

Embodiment 1

A method for estimating the remaining mileage of an electric vehicle, as shown in FIG. 1, specifically includes the following steps:

Step S1: detecting vehicle parameters, road information, and driving modes of the electric vehicle;

Electric vehicles show different driving conditions as the driver's throttle changes, such as constant speed, acceleration, deceleration and idle speed. Because of different driving conditions, acceleration and speed are different, so the driving mode can use information such as the speed and acceleration of the vehicle. to evaluate. In different speed ranges, the efficiency of the vehicle system is different, especially the motor efficiency, and the power loss of the system is also very different. For example, in high-speed mode acceleration, although the acceleration is not large, the system power loss caused by high speed is very different from the system power loss in low-speed mode. Therefore, the driving mode can be further divided according to different vehicle speed intervals.

The driving mode includes a plurality of driving modes divided according to preset vehicle speed values, for example, dividing the driving mode into one or more of a low speed mode, a medium speed mode, a medium speed mode, and or a high speed mode according to different vehicle speed intervals.

In this embodiment, the vehicle speed in the low speed mode is 0-30 km/h, the speed in the medium speed mode is 30-60 km/h, the speed in the medium speed mode is 60-90 km/h, and the speed in the high speed mode is 90 km/h. the above.

The driving mode further includes further dividing each of the medium speed mode, the medium speed mode, and the high speed mode into an acceleration mode, a deceleration mode, and a constant speed mode according to a vehicle speed and an acceleration magnitude, the low speed mode further dividing into an acceleration Mode, deceleration mode, constant speed mode, and idle mode, where:

The acceleration mode is a driving mode in which the vehicle speed is greater than 0 and the acceleration is greater than 0;

The deceleration mode is a driving mode in which the vehicle speed is greater than 0 and the acceleration is less than 0;

The constant speed mode is a driving mode in which the vehicle speed is greater than 0 and the acceleration is equal to 0;

The idle mode is a driving mode in which the vehicle speed is equal to 0 and the acceleration is equal to 0.

It can be seen that the low speed mode may further include an idle speed mode, a low speed acceleration mode, a low speed deceleration mode, and a low speed constant speed mode; the medium speed mode may further include a medium speed acceleration mode, a medium speed deceleration mode, a medium speed constant speed mode, and a medium speed mode. The medium and high speed acceleration mode, the medium and high speed deceleration mode, and the medium and high speed constant speed mode may be further included; the high speed mode may further include a high speed acceleration mode, a high speed deceleration mode, and a high speed constant speed mode. According to the division mode as shown in this embodiment, there are 13 driving modes of electric vehicles.

The vehicle parameters include a power battery SOC, an air conditioning state, a throttle, a gear position, a brake, and/or vehicle speed information, the road surface information including a road surface condition and/or a road surface gradient. Among them, the speed information can be obtained directly through the dashboard.

Step S2: Obtain a corresponding mileage storage value from the mileage storage database according to the vehicle parameter, the road surface information, and the driving mode;

Wherein, the vehicle parameter, the road surface information and the driving mode correspond to vehicle parameters, road surface information and driving mode in the mileage storage database. And each set of vehicle parameters, road information and driving mode has corresponding mileage storage values. The method further includes:

Establish a mileage storage database for each driving mode, including:

The state of charge SOC of the battery pack is divided into N SOC sections, which are respectively the first section, the second section, and the Nth section, where N is an integer greater than 2; in this embodiment, the SOC of the power battery is equally divided. There are 10 intervals, as shown in Fig. 2, in which SOC 0%-10% is the first interval, 20%-30% is the second interval, and so on, and 90%-100% the 10th interval. The mileage storage database stores vehicle parameter information, road surface information, driving mode information, and corresponding interval mileage storage value, and the interval mileage storage value is a distance that the power battery can support the electric vehicle in a certain SOC interval. .

A storage interval database is established in which the vehicle parameters, the road surface information, the driving mode, and the corresponding mileage storage value are stored in each SOC storage interval. The road surface information includes information such as road surface position, road surface slope, road surface traffic condition, and the road surface position information may identify a highway, a city road, or a suburban road according to the navigation system. For example, when the current vehicle residual power is 65%, the SOC storage interval is in the 7th section, driving on the urban road, and the air conditioner is turned on (here only one vehicle parameter is listed, other vehicle parameter information such as throttle, gear position, brake, and vehicle speed information, The driving mode is 1, the vehicle parameter information, the road information and the driving mode information are determined, and the corresponding mileage storage value is obtained from the mileage storage database, as shown in Table 1.

Table 1

Table 1 is an example table of different vehicle parameter values, road information, and mileage storage values corresponding to driving modes in the mileage storage database of the present embodiment.

The calculation method of the interval mileage storage value is:

S201, collecting a vehicle speed signal of the electric vehicle;

The vehicle speed signal of the electric vehicle can be collected by an ABS system (brake anti-lock braking system) or other system that can collect vehicle speed signals.

S202. If the vehicle speed signal is valid during the running of the vehicle, the vehicle speed is integrated from the current SOC interval start time to the current SOC interval end time to obtain a corresponding interval mileage storage value;

If the vehicle speed signal is invalid, the vehicle speed is obtained by multiplying the motor speed by the main reduction ratio. The main reduction ratio refers to the gear ratio of the final drive in the vehicle drive axle, which is equal to the rotational angular speed of the drive shaft. The angular velocity of rotation of the axle half shaft is also equal to the ratio of their rotational speeds. The rotational angular velocity of the drive shaft is a known amount compared to the rotational angular velocity of the upper axle half shaft and their rotational speed. Then, the time integral from the current SOC interval start time to the current SOC interval end time is obtained, and the corresponding interval mileage storage value is obtained.

The method further includes: updating the mileage storage database, specifically including the following steps:

Step S203, using the mileage storage value of each SOC interval as the next driving cycle reference value;

Step S204: When the vehicle is powered on again, the section where the SOC belongs is detected. If the current SOC is on the section dividing node, the mileage is calculated until the section ends, to obtain the mileage calculation value of the SOC section, and the mileage is calculated according to the SOC section. The value updates the mileage storage value of the SOC interval; if the current SOC is not on the interval division node, the SOC interval does not update the interval mileage storage value until the next SOC interval division node, and starts to calculate the mileage until the interval ends, and the SOC is obtained. The interval mileage calculation value updates the mileage storage value of the SOC interval according to the SOC interval mileage calculation value.

Preferably, the updated mileage storage value comprises:

S205, when the SOC enters a certain interval, the mileage is calculated until the end of the interval, and the SOC interval mileage calculation value is calculated by the vehicle controller; when the SOC enters the next interval, the vehicle control calculation mileage is reset to 0, Start calculating mileage.

S206. The SOC interval mileage calculation value is subtracted from the interval value of the previous driving cycle. In this embodiment, the data in the mileage storage database is correspondingly stored in a memory, and the memory is disposed in the electric vehicle. on. The memory, preferably an EEPROM, can also be other types of memory.

If the difference is greater than 0 and greater than the set threshold, the interval value of the interval of the last driving cycle stored in the memory plus the threshold is updated into the memory;

If the difference is less than 0, and the absolute value is greater than the set threshold, the value obtained by subtracting the threshold value from the interval value of the previous driving cycle stored in the memory is updated into the memory;

If the absolute value of the difference is less than or equal to the set threshold, the SOC interval mileage calculation value is updated to the memory. For example, the SOC value of the last driving cycle is 60%, and after a period of charging, the power-on SOC is 86% again, then the 86% of the ninth interval is not updated with the mileage storage value until the SOC is reduced. At 80%, the mileage storage value of the 8th interval is updated until the SOC is reduced to 70%, and the mileage calculation value of the vehicle control calculation is cleared to 0, and the mileage storage value of the 7th interval is recalculated.

There are 12 different driving modes of the vehicle (when the vehicle is in the idle state, it is temporarily not considered), and each driving mode corresponds to a threshold, which further improves the accuracy of the mileage estimation. Let the threshold of the vehicle in low speed acceleration mode be δ ₁ , the threshold of low speed constant speed mode be δ ₂ , the threshold of low speed deceleration mode be δ ₃ , and the threshold of medium speed acceleration mode be δ ₄ , medium speed constant speed mode The lower threshold is δ ₅ , the threshold in the medium speed deceleration mode is δ ₆ ; the threshold in the medium and high speed acceleration mode is δ ₇ , the threshold in the medium and high speed constant speed mode is δ ₈ , and the threshold in the medium and high speed deceleration mode is δ ₉ ; The threshold value in the high-speed acceleration mode is δ ₁₀ , the threshold value in the high-speed acceleration mode is δ ₁₁ , and the threshold in the high-speed deceleration mode is δ ₁₂ . The thresholds are arranged in a matrix according to the driving mode, as shown in Table 2. Under acceleration conditions, δ ₁₀ >δ ₇ >δ ₄ >δ ₁ , under constant speed conditions, δ ₁₁ >δ ₈ >δ ₅ >δ _{2, under} deceleration conditions, δ ₁₂ >δ ₉ >δ ₆ >δ ₃ .

δ 1	δ 2	δ 3
δ 4	δ 5	δ 6
δ 7	δ 8	δ 9
δ 10	δ 11	δ 12

Table 2

The threshold is calculated by: in each driving mode, the N SOC interval mileage calculation value is subtracted from the corresponding driving value of the interval of the previous driving cycle stored in the memory in one driving cycle of the vehicle. The vehicle obtains M×N difference values in M driving cycles, and averages the absolute values of M×N differences, and then obtains a threshold value in the corresponding driving mode, where M is a positive integer.

Step S3: Calculate the remaining mileage according to the obtained mileage storage value.

The mileage value of the current SOC interval is linearly interpolated for the SOC point in the interval, and the mileage value of the SOC point in the SOC interval is obtained, and the mileage value of the current SOC point and the interval mileage value below the interval are added to obtain the remaining Mileage S.

Using the method to estimate the remaining mileage, the current driving mode of the electric vehicle can be detected, the cruising range value is corrected, the accuracy of the remaining mileage estimation is improved, the user is made to make a decision on the driving path, and the mileage anxiety is relieved, thereby improving the user experience. .

Embodiment 2

An electric vehicle residual mileage estimating device, as shown in FIG. 3, the device includes:

The detecting module 1 is configured to detect vehicle parameters, road information and driving modes of the electric vehicle;

The data acquisition module 2 is configured to obtain a corresponding mileage storage value from the mileage storage database according to the vehicle parameter, the road surface information, and the driving mode;

The remaining mileage calculation module 3 is configured to calculate the remaining mileage based on the acquired mileage storage value.

In different speed ranges, the vehicle system efficiency is different, especially the motor efficiency, and the acceleration in the high speed mode, although the acceleration is not large, the system power loss due to the high speed cannot be ignored. Therefore, it is necessary to divide the driving mode in different vehicle speed intervals.

The device further includes a driving module dividing module, and the driving mode dividing module divides the driving modes according to the preset vehicle speed value. For example, the driving mode dividing module is divided into a low speed mode, a medium speed mode, and a medium speed according to the vehicle speed value. One or more of mode and high speed mode.

In this embodiment, the vehicle speed in the low speed mode is 0-30 km/h, the speed in the medium speed mode is 30-60 km/h, the speed in the medium speed mode is 60-90 km/h, and the speed in the high speed mode is 90 km/h. the above.

The driving module dividing module further further divides each of the medium speed mode, the medium speed mode, and the high speed mode into an acceleration mode, a deceleration mode, and a constant speed mode according to a vehicle speed and an acceleration magnitude, and the low speed mode is further divided into Acceleration mode, deceleration mode, constant speed mode, and idle mode, among them,

The acceleration mode is a driving mode in which the vehicle speed is greater than 0 and the acceleration is greater than 0;

The deceleration mode is a driving mode in which the vehicle speed is greater than 0 and the acceleration is less than 0;

The constant speed mode is a driving mode in which the vehicle speed is greater than 0 and the acceleration is equal to 0;

The idle mode is a driving mode in which the vehicle speed is equal to 0 and the acceleration is equal to 0.

It can be seen that the low speed mode may further include an idle speed mode, a low speed acceleration mode, a low speed deceleration mode, and a low speed constant speed mode; the medium speed mode may further include a medium speed acceleration mode, a medium speed deceleration mode, a medium speed constant speed mode, and a medium speed mode. The medium and high speed acceleration mode, the medium and high speed deceleration mode, and the medium and high speed constant speed mode may be further included; the high speed mode may further include a high speed acceleration mode, a high speed deceleration mode, and a high speed constant speed mode. According to the division mode as shown in this embodiment, the electric vehicle includes a total of 13 driving modes.

The apparatus also includes a database creation module for establishing a mileage storage database for each driving mode.

The database building module includes:

The SOC section dividing unit is configured to divide the state of charge SOC of the electronic group into N SOC sections, which are respectively a first section, a second section, an Nth section, where N is an integer greater than 2;

The data storage unit is configured to store vehicle parameter information, road surface information, driving mode information, and a range mileage storage value corresponding to each section for each section.

In this embodiment, the remaining power of the power SOC battery is equally divided into 10 sections, as shown in FIG. 2, wherein SOC 0%-10% is the first interval, 20%-30% is the second interval, and so on. , 90% - 100% of the 10th interval. Each SOC interval stores a corresponding stored mileage value, vehicle parameters, road surface status, and driving mode information.

A storage interval database is established in which the vehicle parameters, the road surface information, the driving mode, and the corresponding mileage storage distance are stored in each SOC storage interval. For example, when the current vehicle residual power is 65%, the SOC storage interval is in the 7th section, driving on the urban road, and the air conditioner is turned on, the driving mode is 1, and the mileage of the section is stored as 20, as shown in Table 3.

table 3

Table 3 is an example table of different vehicle parameter values, road information, and mileage storage values corresponding to the driving mode in the mileage storage database of the present embodiment.

The database establishing module further includes a section mileage storage value calculation unit,

The interval mileage storage value calculation unit is configured to collect a vehicle speed signal of the electric vehicle, wherein the vehicle speed signal of the electric vehicle can be collected by the ABS system (brake anti-lock braking system), or he can pass other systems that can collect the vehicle speed signal. The vehicle speed signal is collected.

Calculating the interval mileage storage value according to the collected vehicle speed signal, specifically:

If the vehicle speed signal is valid, the vehicle speed is integrated from the current SOC interval start time to the current SOC interval end time, and the corresponding interval mileage storage value is obtained;

If the vehicle speed signal is invalid, the vehicle speed is obtained by multiplying the motor speed by the main reduction ratio, and then integrating the time from the current SOC interval start time to the current SOC interval end time to obtain the corresponding interval mileage storage value.

The device also includes a database update module for updating the mileage storage database;

The database update module includes:

An initialization unit, configured to use the mileage storage value of each SOC interval as a reference value of the next driving cycle;

The mileage storage value updating unit is configured to detect a section to which the SOC belongs when the vehicle is powered on again, and if the current SOC is on the section dividing node, start calculating the mileage until the interval ends, to obtain the mileage calculation value of the SOC section, according to The SOC interval mileage calculation value updates a mileage storage value of the SOC interval;

If the current SOC is not on the interval division node, the SOC interval does not update the interval mileage storage value until the next SOC interval is divided into nodes, and the mileage is calculated until the interval ends, and the SOC interval mileage calculation value is obtained, according to the SOC interval. The mileage calculation value updates the mileage storage value of the SOC interval.

The mileage storage value update unit includes:

The SOC interval mileage calculation sub-unit is configured to start calculating the mileage when the SOC enters a certain interval, until the end of the interval, and calculate the mileage calculation value of the SOC interval;

In this embodiment, the data in the mileage storage database is correspondingly stored in a memory, and the memory is disposed on the electric vehicle. The memory, preferably an EEPROM, can also be other types of memory.

The SOC interval mileage value correcting subunit is configured to subtract the SOC interval mileage calculation value from the mileage value of the previous driving cycle stored in the memory, and if the difference is greater than 0 and greater than the set threshold, the SOC interval is stored. The interval mileage value plus the value of the threshold value is updated into the memory in the last driving cycle in the memory, wherein the interval mileage value may also be stored in other memories, not limited to the memory;

If the difference is less than 0, and the absolute value is greater than the set threshold, the value obtained by subtracting the threshold value from the interval value of the previous driving cycle stored in the memory is updated into the memory;

If the absolute value of the difference is less than or equal to the set threshold, the SOC interval mileage calculation value is updated to the memory.

For example, the SOC value of the last driving cycle is 60%, and after a period of charging, the power-on SOC is 86% again, then the 86% of the ninth interval is not updated with the mileage storage value until the SOC is reduced. At 80%, the mileage storage value of the 8th interval is updated until the SOC is reduced to 70%, and the mileage calculation value of the vehicle control calculation is cleared to 0, and the mileage storage value of the 7th interval is recalculated.

There are 12 different driving modes of the vehicle (when the vehicle is in the idle state, it is temporarily not considered), and each driving mode corresponds to a threshold, which further improves the accuracy of the mileage estimation. Let the threshold of the vehicle in low speed acceleration mode be δ ₁ , the threshold of low speed constant speed mode be δ ₂ , the threshold of low speed deceleration mode be δ ₃ , and the threshold of medium speed acceleration mode be δ ₄ , medium speed constant speed mode The lower threshold is δ ₅ , the threshold in the medium speed deceleration mode is δ ₆ ; the threshold in the medium and high speed acceleration mode is δ ₇ , the threshold in the medium and high speed constant speed mode is δ ₈ , and the threshold in the medium and high speed deceleration mode is δ ₉ ; The threshold value in the high-speed acceleration mode is δ ₁₀ , the threshold value in the high-speed acceleration mode is δ ₁₁ , and the threshold in the high-speed deceleration mode is δ ₁₂ . The thresholds are arranged in a matrix according to the driving mode, as shown in Table 4. Under acceleration conditions, δ ₁₀ >δ ₇ >δ ₄ >δ ₁ , under constant speed conditions, δ ₁₁ >δ ₈ >δ ₅ >δ _{2, under} deceleration conditions, δ ₁₂ >δ ₉ >δ ₆ >δ _3.

δ 1	δ 2	δ 3
δ 4	δ 5	δ 6
δ 7	δ 8	δ 9
δ 10	δ 11	δ 12

Table 4

The mileage storage value update unit further includes a threshold calculation sub-unit for calculating a threshold corresponding to each driving mode, and specifically includes: in each driving mode, obtaining a mileage calculation value of N SOC intervals in one driving cycle of the vehicle. Go to the corresponding difference in the mileage value of the interval in the previous driving cycle stored in the memory, obtain M×N difference values for the M driving cycles, and average the absolute values of M×N differences. Corresponding to the threshold in driving mode, where M is a positive integer.

The mileage information acquisition module further includes an information collection unit, configured to collect vehicle location information, acquire current vehicle parameters and actual traffic condition information of the electric vehicle in real time, and determine a vehicle driving mode;

The vehicle parameters include a power battery SOC, an air conditioning state, a throttle, a gear position, a brake, and/or vehicle speed information, the road surface information including a road surface condition and/or a road surface gradient.

The remaining mileage calculation module 3 is further configured to: perform a linear interpolation calculation on the SOC point of the current SOC interval for the SOC point in the interval, obtain a mileage value of the SOC point in the SOC interval, and calculate the mileage value of the current SOC point and the The mileage values below the interval are added to obtain the remaining mileage S.

Using the device to estimate the remaining mileage, the current driving mode of the electric vehicle can be detected, the cruising range value is corrected, the accuracy of the remaining mileage estimation is improved, the user is made to make a decision on the driving path, and the mileage anxiety is relieved, thereby improving the user experience. .

Embodiment 3

A remote server for receiving vehicle parameters, road information, and driving mode information of an electric vehicle, and establishing a mileage storage database for each driving mode.

The remote server receives the target location information, and generates driving mode information and best recommended path information according to the current vehicle parameter of the electric vehicle. The beneficial technical effect of the remote server is that each vehicle transmits data to the remote server, the data of multiple vehicles is continuously uploaded, the database is continuously improved, and the accuracy of the data is continuously improved. Optionally, each car uploads data to the cloud through the Internet of Vehicles technology, and the uploading method is not limited to the Internet of Vehicles technology.

The remote server can also provide a recommended path service. The driver inputs information from the current location to the destination location in the navigation system. The navigation system generates multiple paths for the driver's reference. The remote server uses the current vehicle parameters, the past road state and The driving route makes the best recommended route for the driver to choose. In addition, in order to better guide the driver's driving behavior and extend the remaining mileage, the driving mode button can be provided in the vehicle center console, such as energy saving mode (ECO mode), comfort mode (Normal mode), sport mode (Sport mode), crazy Mode (Crazy mode), when the vehicle is not fully charged and the battery power does not meet the driver's needs, the remote server will remind the driver to select the appropriate driving mode. Further enhance the user experience. It can be seen that the driving modes exemplarily controlled by the driving mode button and the driving mode divided by the above-described vehicle speed section are different in the division basis, and the two are not the same.

The present invention also includes an electric vehicle remaining mileage estimating system, the system including a remaining mileage estimating device and a remote server, the remaining mileage estimating device interacting with the remote server through an in-vehicle network to realize the remaining mileage of the electric vehicle Estimate.

The remote server may be a server disposed at a remote end, and more broadly, may be a cloud server.

The invention further comprises a computer readable storage medium comprising a plurality of instructions which, when executed by a processor, implement the steps of the method of the first embodiment.

All embodiments of the present invention are applicable not only to electric vehicles, but also to other vehicles having a power supply system.

The above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the present invention. The skilled person can make some modifications or modifications to the equivalent embodiments by using the above-disclosed technical contents without departing from the technical scope of the present invention, but the present invention does not deviate from the technical solution of the present invention. Technical Substantials Any simple modifications, equivalent changes and modifications made to the above embodiments are still within the scope of the technical solutions of the present invention.

Claims (27)

1. A method for estimating a remaining mileage of a vehicle having a power supply system, comprising: the following steps:

   Detecting vehicle parameters, road information, and driving modes of a vehicle having a power supply system;

   Obtaining a corresponding mileage storage value from the mileage storage database according to the vehicle parameter, the road surface information, and the driving mode;

   The remaining mileage is calculated based on the acquired mileage storage value.
2. The method for estimating a remaining mileage of a vehicle having a power supply system according to claim 1, wherein:

   The driving mode includes one or more of a low speed mode, a medium speed mode, a medium speed mode, and a high speed mode.
3. The method for estimating a remaining mileage of a vehicle having a power supply system according to claim 2, wherein:

   Each of the medium speed mode, the medium speed mode, and the high speed mode is further divided into an acceleration mode, a deceleration mode, and a constant speed mode according to a vehicle speed and an acceleration magnitude, and the low speed mode is further divided into an acceleration mode, a deceleration mode, and a constant speed. Mode and idle mode, where:

   The acceleration mode is a driving mode in which the vehicle speed is greater than 0 and the acceleration is greater than 0;

   The deceleration mode is a driving mode in which the vehicle speed is greater than 0 and the acceleration is less than 0;

   The constant speed mode is a driving mode in which the vehicle speed is greater than 0 and the acceleration is equal to 0;

   The idle mode is a driving mode in which the vehicle speed is equal to 0 and the acceleration is equal to 0.
4. The method of claim 1, wherein the method further comprises:

   Establish a mileage storage database for each driving mode, including:

   The state of charge SOC of the battery pack is divided into N SOC sections, which are respectively a first section, a second section, an Nth section, where N is an integer greater than 2;

   The vehicle parameter information, the road surface information, the driving mode information, and the section mileage storage value corresponding to each section are stored for each section.
5. The method for estimating a remaining mileage of a vehicle having a power supply system according to claim 4, wherein:

   The calculation method of the interval mileage storage value is:

   Collecting a vehicle speed signal of a vehicle having a power supply system;

   If the vehicle speed signal is valid, the vehicle speed is integrated from the current SOC interval start time to the current SOC interval end time, and the corresponding interval mileage storage value is obtained;

   If the vehicle speed signal is invalid, the vehicle speed is obtained by multiplying the motor speed by the main reduction ratio, and then integrating the time from the current SOC interval start time to the current SOC interval end time to obtain the corresponding interval mileage storage value.
6. The method for estimating a remaining mileage of a vehicle with a power supply system according to claim 4, wherein the method further comprises:

   Updating the mileage storage database specifically includes:

   The mileage storage value of each SOC interval is used as a reference value of the next driving cycle;

   When the vehicle is powered on again, the section where the SOC belongs is detected. If the current SOC is on the section dividing node, the mileage is calculated until the section ends, to obtain the mileage calculation value of the SOC section, and the mileage calculation value is updated according to the SOC section mileage calculation value. The mileage storage value of the SOC interval;

   If the current SOC is not on the interval division node, the SOC interval does not update the interval mileage storage value until the next SOC interval is divided into nodes, and the mileage is calculated until the interval ends, and the SOC interval mileage calculation value is obtained, according to the SOC interval. The mileage calculation value updates the mileage storage value of the SOC interval.
7. The method for estimating a remaining mileage of a vehicle having a power supply system according to claim 6, wherein:

   The updated mileage storage value includes:

   When the SOC enters a certain interval, the mileage is calculated until the end of the interval, and the calculated mileage of the SOC interval is calculated;

   The SOC interval mileage calculation value is subtracted from the interval value of the previous driving cycle. If the difference is greater than 0 and greater than the set threshold, the mileage value of the interval of the previous driving cycle is added to the threshold, and updated to The mileage storage value corresponding to the SOC interval;

   If the difference is less than 0, and the absolute value is greater than the set threshold, the mileage value of the interval of the previous driving cycle is subtracted from the threshold, and updated to the mileage storage value of the corresponding SOC interval;

   If the absolute value of the difference is less than or equal to the set threshold, the SOC interval mileage calculation value is updated to the mileage storage value of the corresponding SOC interval.
8. The method for estimating a remaining mileage of a vehicle with a power supply system according to claim 7, wherein:

   Each driving mode corresponds to a threshold value, and the threshold is calculated by: in each driving mode, the N SOC interval mileage calculation value is subtracted from the corresponding driving cycle of the previous driving cycle in one driving cycle of the vehicle. The difference is that the vehicle obtains M×N difference values in M driving cycles, and the absolute values of M×N differences are averaged, and the threshold value in the corresponding driving mode is obtained, where M is a positive integer.
9. The method for estimating a remaining mileage of a vehicle with a power supply system according to claim 1, wherein:

   The vehicle parameters include a power battery SOC, an air conditioning state, a throttle, a gear position, a brake, and/or vehicle speed information, the road surface information including a road surface condition and/or a road surface gradient.
10. A method for estimating a remaining mileage of a vehicle having a power supply system according to claim 4, wherein:

    Calculating the remaining mileage specifically includes:

    The mileage value of the current SOC interval is linearly interpolated for the SOC point in the interval, and the mileage value of the SOC point in the SOC interval is obtained, and the mileage value of the current SOC point and the interval mileage value below the interval are added to obtain the remaining Mileage S.
11. The method for estimating a remaining mileage of a vehicle having a power supply system according to claim 2 or 3, wherein:

    The vehicle speed in the low speed mode is 0-30 km/h, the speed in the medium speed mode is 30-60 km/h, the speed in the medium speed mode is 60-90 km/h, and the speed in the high speed mode is 90 km/h or more.
12. A vehicle remaining mileage estimating device with a power supply system, characterized in that: the device comprises:

    a detecting module, configured to detect vehicle parameters, road information, and driving mode of a vehicle having a power supply system;

    a data acquisition module, configured to acquire a corresponding mileage storage value from the mileage storage database according to the vehicle parameter, the road surface information, and the driving mode;

    The remaining mileage calculation module is configured to calculate the remaining mileage based on the acquired mileage storage value.
13. The vehicle remaining mileage estimating device with a power supply system according to claim 12, wherein:

    The apparatus also includes a driving module dividing module that divides the driving mode into one or more of a low speed mode, a medium speed mode, a medium speed mode, and a high speed mode.
14. The vehicle remaining mileage estimating device with a power supply system according to claim 13, wherein:

    The driving module dividing module further divides each of the medium speed mode, the medium speed mode, and the high speed mode into an acceleration mode, a deceleration mode, and a constant speed mode according to a vehicle speed and an acceleration magnitude, where the low speed mode is further divided into an acceleration mode. Mode, deceleration mode, constant speed mode, and idle mode, wherein

    The acceleration mode is a driving mode in which the vehicle speed is greater than 0 and the acceleration is greater than 0;

    The deceleration mode is a driving mode in which the vehicle speed is greater than 0 and the acceleration is less than 0;

    The constant speed mode is a driving mode in which the vehicle speed is greater than 0 and the acceleration is equal to 0;

    The idle mode is a driving mode in which the vehicle speed is equal to 0 and the acceleration is equal to 0.
15. The vehicle remaining mileage estimating device with a power supply system according to claim 12, wherein:

    The apparatus also includes a database creation module for establishing a mileage storage database for each driving mode.
16. The vehicle remaining mileage estimating device with a power supply system according to claim 15, wherein:

    The database building module includes:

    The SOC section dividing unit is configured to divide the state of charge SOC of the battery pack into N SOC sections, and is respectively a first section, a second section, an Nth section, where N is an integer greater than 2;

    The data storage unit is configured to store vehicle parameter information, road surface information, driving mode information, and a range mileage storage value corresponding to each section for each section.
17. The vehicle remaining mileage estimating device with a power supply system according to claim 16, wherein:

    The database establishing module further includes a section mileage storage value calculation unit,

    The interval mileage storage value calculation unit is configured to collect a vehicle speed signal of a vehicle having a power supply system, and calculate a range mileage storage value, specifically:

    If the vehicle speed signal is valid, the vehicle speed is integrated from the current SOC interval start time to the current SOC interval end time, and the corresponding interval mileage storage value is obtained;

    If the vehicle speed signal is invalid, the vehicle speed is obtained by multiplying the motor speed by the main reduction ratio, and then integrating the time from the current SOC interval start time to the current SOC interval end time to obtain the corresponding interval mileage storage value.
18. The vehicle remaining mileage estimating device with a power supply system according to claim 16, wherein:

    The device also includes a database update module for updating the mileage storage database;

    The database update module includes:

    An initialization unit, configured to use the mileage storage value of each SOC interval as a reference value of the next driving cycle;

    The mileage storage value updating unit is configured to detect a section to which the SOC belongs when the vehicle is powered on again, and if the current SOC is on the section dividing node, start calculating the mileage until the interval ends, to obtain the mileage calculation value of the SOC section, according to the The SOC interval mileage calculation value updates the mileage storage value of the SOC interval;

    If the current SOC is not on the interval division node, the SOC interval does not update the interval mileage storage value until the next SOC interval is divided into nodes, and the mileage is calculated until the interval ends, and the SOC interval mileage calculation value is obtained, according to the SOC interval. The mileage calculation value updates the mileage storage value of the SOC interval.
19. The vehicle remaining mileage estimating device with a power supply system according to claim 18, wherein:

    The mileage storage value update unit includes:

    The SOC interval mileage calculation sub-unit is configured to start calculating the mileage when the SOC enters a certain interval, until the end of the interval, and calculate the mileage calculation value of the SOC interval;

    The SOC interval mileage value correcting subunit is configured to subtract the mileage value of the SOC interval from the mileage value of the previous driving cycle, and if the difference is greater than 0 and greater than the set threshold, the interval of the previous driving cycle is The mileage value is added to the threshold value, and is updated to a mileage storage value corresponding to the SOC interval;

    If the difference is less than 0, and the absolute value is greater than the set threshold, the mileage value of the interval of the previous driving cycle is subtracted from the threshold value, and updated to the mileage storage value of the corresponding SOC interval;

    If the absolute value of the difference is less than or equal to the set threshold, the SOC interval mileage calculation value is updated to the mileage storage value of the corresponding SOC interval.
20. The vehicle remaining mileage estimating device with a power supply system according to claim 19, wherein:

    The mileage storage value update unit further includes a threshold calculation sub-unit for calculating a threshold corresponding to each driving mode, and specifically includes: in each driving mode, obtaining a mileage calculation value of N SOC intervals in one driving cycle of the vehicle. Go to the corresponding difference in the mileage value of the previous driving cycle, get M×N difference values for the M driving cycles, and average the absolute values of M×N differences, then get the corresponding driving mode. Threshold, where M is a positive integer.
21. The vehicle remaining mileage estimating device with a power supply system according to claim 12, wherein:

    The mileage information acquisition module further includes an information collection unit, configured to collect vehicle location information, acquire current vehicle parameters and actual traffic condition information of the vehicle having the power supply system in real time, and determine a vehicle driving mode;

    The vehicle parameters include a power battery SOC, an air conditioning state, a throttle, a gear position, a brake, and/or vehicle speed information, the road surface information including a road surface condition and/or a road surface gradient.
22. The vehicle remaining mileage estimating device with a power supply system according to claim 16, wherein:

    The remaining mileage calculation module is further configured to: perform a linear interpolation calculation on the SOC point of the current SOC interval for the SOC point in the interval, obtain a mileage value of the SOC point in the SOC interval, and set the mileage value of the current SOC point and the interval. The following interval mileage values are added to obtain the remaining mileage S.
23. A vehicle remaining mileage estimating device with a power supply system according to claim 13 or 14, wherein:

    The vehicle speed in the low speed mode is 0-30 km/h, the speed in the medium speed mode is 30-60 km/h, the speed in the medium speed mode is 60-90 km/h, and the speed in the high speed mode is 90 km/h or more.
24. A remote server is characterized in that: the remote server is configured to receive vehicle parameters, road surface information and driving mode information of a vehicle having a power supply system, and establish a mileage storage database in each driving mode.
25. The remote server according to claim 24, wherein the remote server receives the target location information, and generates driving mode information and best recommended path information according to vehicle parameters of the vehicle currently having the power supply system.
26. A vehicle remaining mileage estimating system having a power supply system, characterized in that the system comprises the remaining mileage estimating device according to any one of claims 12-23 and the remote server according to claim 24 or 25. The remaining mileage estimating device interacts with the remote server through an in-vehicle network.
27. A computer readable storage medium, characterized in that the storage medium comprises a plurality of instructions which, when executed by a processor, implement the steps of any of claims 1 to 11.

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