It is understood that the influence of temperature on the discharge performance of the power battery is directly reflected on the discharge capacity and the discharge voltage. The temperature is reduced, the internal resistance of the power battery is increased, the electrochemical reaction speed is slowed, the polarization internal resistance is rapidly increased, and the discharge capacity and the discharge platform are reduced, so that the power and energy output of the power battery is influenced, and the driving range of the vehicle is obviously reduced in winter.

In addition, the discharge rate is also an important factor influencing the discharge capacity of the power battery, and the higher the discharge current is, the higher the polarization internal resistance of the power battery is, and the worse the discharge capacity of the power battery is.

The SOE (state of energy) of the power battery comprehensively considers the factors of temperature, service life, discharge rate, consistency of the power battery and the like, and the SOH (state of health) considers the factors of capacity attenuation and internal resistance increase of the power battery, so that the available energy is calculated by adopting the SOE and the SOH of the power battery, the residual driving range of the vehicle is calculated by the available energy, and the accurate estimation of the driving range capacity of the vehicle can be realized.

The invention provides a vehicle control unit, a vehicle and a method and a device for displaying the remaining driving range of the vehicle.

The following describes a vehicle control unit, a vehicle, and a remaining driving range display method and device thereof according to an embodiment of the present invention with reference to the drawings.

Fig. 1 is a remaining range display method of a vehicle according to an embodiment of the present invention. As shown in fig. 1, the remaining range display method of the vehicle includes the steps of:

in step S101, the current SOC value of the power battery is detected.

For example, the embodiment of the present invention may detect the current SOC value of the power battery in real time through a VCU (Vehicle Control Unit), where there are various ways to detect the current SOC value of the power battery, for example, the current SOC value may be detected through a detection module, and no specific limitation is made herein in order to avoid redundancy.

In step S102, the current remaining range calculated value and the remaining range display reference value are acquired to obtain a range difference value between the current remaining range calculated value and the remaining range display reference value.

The current remaining driving range calculation value may be obtained by an available energy of the battery, and the remaining driving range display reference value may be obtained by the VCU, so that, after the current remaining driving range calculation value and the remaining driving range display reference value are obtained, a range difference between the current remaining driving range calculation value and the remaining driving range display reference value may be obtained by calculation.

For example, after the vehicle starts to be charged, the SOE and SOH of the power battery are obtained through the VCU to obtain the available energy of the power battery, so that the current remaining driving range calculated value can be obtained according to the available energy of the power battery, wherein the calculation method can be obtained through the following formula:

in step S103, obtaining the current SOC value and the corresponding remaining driving range display reference value update rate under the difference value according to the current SOC value, the difference value and the first relationship; wherein the first relationship is a relationship between the SOC value, the mileage difference value, and the remaining driving range display reference value update rate.

Further, in an embodiment of the present invention, the method for displaying remaining driving range of a vehicle further includes: obtaining an updating rate reference value of the residual driving range display reference value; and charging the power battery for multiple times, acquiring a sampling SOC value and a sampling difference value after each charging, and acquiring the updating rate of the residual driving range display reference value corresponding to the sampling SOC value and the sampling difference value, and establishing a first relation by taking the updating rate reference value as a limit value.

Specifically, when the first relationship is established, the power battery may be charged for a plurality of times to obtain a sampled SOC value and a sampled difference value after each charging, where the sampled difference value is a range difference value between a remaining range calculation value and a remaining range display reference value obtained after each charging, and the first relationship may be established by using an update rate reference value of the remaining range display reference value as a limit value according to the sampled SOC value, the sampled difference value, and an update rate of the remaining range display reference value corresponding to the sampled SOC value and the sampled difference value. Wherein the first relationship may be as shown in table 2.

It should be noted that r1 to r5 in table 2 are all smaller than the update rate reference value of the remaining driving range display reference value, and therefore, when the first relationship is established, the update rate reference value needs to be established as a limit value, and if the update rate corresponding to the sampling SOC and the sampling difference value is greater than the update rate reference value, this data is discarded. In addition, the calculation method of the update rate reference value of the remaining driving range display reference value will be described in detail below, and detailed description is omitted here to avoid redundancy.

TABLE 2

Further, in an embodiment of the present invention, the method for displaying remaining driving range of a vehicle further includes: charging the power battery within a preset time length; obtaining the increment of the display reference value of the remaining driving range in the preset duration according to the rated driving range value of the vehicle and the SOC increment in the preset duration; and obtaining an updating rate reference value of the residual driving range display reference value in the preset duration according to the preset duration and the increment of the residual driving range display reference value in the preset duration.

It can be understood that, the embodiment of the invention can charge the power battery within a preset time period, wherein the preset time period can be 30s, or 60s, etc., and can be specifically set by those skilled in the art according to the actual situation, and obtains the rated driving range value of the Vehicle and the SOC increment in a preset time period through a VCU (Vehicle Control Unit), for example, the preset time may be t, according to the charging performance of the power battery, delta SOC is charged with current of C multiplying power at the time t at 25 ℃, wherein, the delta SOC is the SOC increment in the preset time length, so that according to the SOC increment in the preset time length, and the rated driving range value of the vehicle, obtaining the increment of the display reference value of the remaining driving range in the preset time length, wherein the increase Δ R of the remaining driving range display reference value may be obtained by the following formula:

ΔR＝R0*ΔSOC。

therefore, after the preset duration and the residual driving range display reference value in the preset duration are obtained, the updating rate reference value r of the residual driving range display reference value can be obtained through the following formula₀：

Further, in order to keep the current remaining range calculated value and the remaining range display reference value consistent at the time of charging, the remaining range display reference value may be updated at a slower speed when the SOC is low, and may be updated at a faster speed when the SOC is high due to a larger difference between the current remaining range calculated value and the remaining range display reference value. In addition, when the temperature is higher than 25 ℃, in order to enable the residual driving range display reference value to be consistent with the rated driving range value of the vehicle, when the residual driving range display reference value can be more than 99% of SOC, the updating period is a sampling period, namely, the updating is carried out rapidly.

Further, in an embodiment of the present invention, the method for displaying remaining driving range of a vehicle further includes: detecting a current driving mode and/or an air-conditioning state of the vehicle; obtaining a correction coefficient for correcting the driving range display reference value according to the current driving mode and/or the air conditioner state; and correcting the current driving range display reference value according to the correction coefficient to obtain the actual residual driving range display value of the vehicle.

Generally, the driving modes include a manual driving mode and an automatic driving mode, and when the driving modes are switched by a user, the cruising ability of the vehicle is influenced to a certain extent; the air conditioning state mainly comprises an opening state (such as a heating mode or a cooling mode) and a closing state, and when the air conditioning state is in the opening state, the cruising ability of the vehicle can be greatly reduced.

Therefore, it is also possible to detect the driving mode of the vehicle, or the air-conditioning state of the vehicle, or both the driving mode of the vehicle and the air-conditioning state of the vehicle, to generate a correction coefficient according to either or both of the detected driving mode of the vehicle and the air-conditioning state of the vehicle, to correct the current driving range display reference value, to obtain the actual remaining driving range display value of the vehicle, thereby further calculating the accuracy.

It can be understood that, when considering the influence of the air conditioner operating state on the current driving range display reference value, the current driving range display reference value may be obtained and then multiplied by an ACS proportionality coefficient to correct the current driving range display reference value, where the ACS proportionality coefficient may be a fixed value or may be obtained by a person skilled in the art after a big data analysis, and is not specifically limited herein.

For example, when the air conditioner of the vehicle is in an on state, the cruising ability of the vehicle may be greatly reduced, and at this time, the ACS proportionality coefficient may be 0.9, and the actual remaining driving range display value is the driving range display reference value × 0.9, so as to correct the current driving range display reference value, so that the corrected data is more accurate.

Further, in an embodiment of the present invention, the method for displaying remaining driving range of a vehicle further includes: when the vehicle enters a charging working condition, the current available energy of the power battery is obtained according to the current energy state and the current health state of the vehicle, and the current remaining driving range calculated value is obtained according to the average power consumption rate.

It can be understood that, after receiving the charging driving interlock signal, the embodiment of the present invention may determine that the vehicle enters the charging condition according to the charging driving interlock signal, and may detect the current energy state and the current health state of the power battery at this time. That is to say, after detecting the vehicle and beginning to charge, can receive the driving interlocking signal that charges, the vehicle can be automatic to be locked to guarantee the phenomenon that the driving can not appear, effectively improve the security of vehicle.

Specifically, the embodiment of the invention can detect the current energy state and the current state of health of the power battery through the VCU. The energy state of the power battery can fully consider the voltage change of the power battery in the use process, and can more accurately reflect the real energy state of the power battery, so that the maximum driving range of the vehicle is effectively predicted, the over charge/discharge of the battery is prevented, the service life of the power battery is prolonged, the use efficiency of the power battery is improved, the use cost of the vehicle is reduced, and the energy state of the power battery can be monitored and calculated by the vehicle controller. The health state of the power battery refers to the ratio of the electric quantity discharged by the power battery from a full-charge state to a cut-off voltage at a certain multiplying power to the corresponding rated capacity under a standard condition, and the ratio can be monitored and calculated by the vehicle control unit.

Further, when the vehicle enters the charging condition, the embodiment of the present invention may further obtain the current available energy of the power battery according to the current energy state and the current health state of the power battery, and the current available energy of the power battery may be obtained by calculation according to a preset calculation formula, and the preset calculation formula may be obtained by analyzing a large amount of data by a person skilled in the art, or obtained according to a calculation method in the related art, which is not limited specifically herein.

The average power consumption rate can be obtained through the preset rated energy and the preset rated driving range, a calculation formula among the average power consumption rate, the rated energy and the preset rated driving range value of the vehicle can be established in advance, and after the rated energy and the preset rated driving range value of the vehicle are obtained, the average power consumption rate can be obtained through the calculation formula, so that the current residual driving range of the vehicle can be obtained according to the current available energy and the average power consumption rate.

For example, the average power consumption rate of the vehicle may be E, the available energy of the power battery at the time of factory shipment is E0, and the rated driving range value of the vehicle is R0, then the average power consumption rate E of the vehicle measured under a certain specific operating condition is:

for example, as shown in fig. 2, in an embodiment of the present invention, the method for displaying the remaining driving range of the vehicle includes the following steps:

s201, the vehicle is powered on.

And S202, initializing the vehicle controller to obtain a driving range display reference value.

And S203, judging whether the charging wire is connected, if so, executing the step S205, otherwise, executing the step S204.

And S204, acquiring and updating the current remaining driving range calculation value.

And S205, sending a charging running interlocking signal when the charging condition is met.

And S206, entering a charging process.

And S207, detecting the current energy state and the current health state of the power battery.

And S208, obtaining the current available energy of the power battery according to the current energy state and the current health state.

And S209, obtaining a current remaining driving range calculation value according to the current available energy and the average power consumption rate of the power battery.

And S210, updating the residual driving range display reference value.

And S211, correcting by combining the ACS proportional coefficient to obtain the actual remaining driving range display value of the vehicle.

According to the method for displaying the remaining driving range of the vehicle, provided by the embodiment of the invention, the current SOC value of the power battery can be detected, the range difference value between the current calculated value of the remaining driving range and the display reference value of the remaining driving range is obtained, the updating rate of the current SOC value and the display reference value of the remaining driving range under the difference value is obtained according to the current SOC value, the difference value and the first relation, the display reference value of the remaining driving range is updated according to the updating rate of the display reference value of the remaining driving range, and the display reference value of the remaining driving range is corrected according to the air-conditioning state and/or the driving mode of the vehicle, so that the accuracy of the display reference value of the remaining driving range is effectively improved, the calculation accuracy is improved, the practicability and the applicability of the vehicle are improved, and the use experience of a user is improved.

Fig. 3 is a remaining range display device of the vehicle according to the embodiment of the present invention. As shown in fig. 3, the remainingrange display device 10 of the vehicle includes: afirst detection module 100, acalculation module 200 and afirst acquisition module 300.

Thefirst detection module 100 is used for detecting a current SOC value of the power battery. Thecalculation module 200 is configured to obtain the current remaining driving range calculation value and the remaining driving range display reference value, so as to obtain a range difference value between the current remaining driving range calculation value and the remaining driving range display reference value. The first obtainingmodule 300 is configured to obtain the current SOC value and the corresponding remaining driving range display reference value update rate under the difference value according to the current SOC value, the difference value and the first relationship; wherein the first relationship is a relationship between the SOC value, the mileage difference value, and the remaining driving range display reference value update rate.

Further, in an embodiment of the present invention, the remaining driving range display device of the vehicle further includes: the second acquisition module is used for acquiring an update rate reference value of the residual driving range display reference value; the establishing module is used for charging the power battery for multiple times, acquiring a sampling SOC value and a sampling difference value after each charging, and the updating rate of the residual driving range display reference value corresponding to the sampling SOC value and the sampling difference value, and establishing a first relation by taking the updating rate reference value as a limit value.

Further, in an embodiment of the present invention, the remaining driving range display device of the vehicle further includes: the charging module is used for charging the power battery within a preset time length; the third obtaining module is used for obtaining the increment of the residual driving range display reference value in the preset duration according to the rated driving range value of the vehicle and the SOC increment in the preset duration; and the fourth obtaining module is used for obtaining the update rate reference value of the residual driving range display reference value in the preset duration according to the preset duration and the increment of the residual driving range display reference value in the preset duration.

Further, in an embodiment of the present invention, the remaining driving range display device of the vehicle further includes: the device comprises a second detection module, a fourth acquisition module and a correction module. The second detection module is used for detecting the current driving mode and/or the air conditioner state of the vehicle. And the fourth acquisition module is used for acquiring a correction coefficient for correcting the driving range display reference value according to the current driving mode and/or the air conditioner state. And the correction module is used for correcting the current driving range display reference value according to the correction coefficient so as to obtain the actual residual driving range display value of the vehicle.

It should be noted that the above explanation of the embodiment of the remaining driving range display method of the vehicle is also applicable to the remaining driving range display device of the vehicle of this embodiment, and will not be repeated herein.

According to the remaining driving range display device of the vehicle, provided by the embodiment of the invention, the current SOC value of the power battery can be detected, the range difference value between the current remaining driving range calculation value and the remaining driving range display reference value is obtained, the updating rate of the current SOC value and the remaining driving range display reference value under the difference value is obtained according to the current SOC value, the difference value and the first relation, the remaining driving range display reference value is updated according to the updating rate of the remaining driving range display reference value, the remaining driving range display reference value is corrected according to the air-conditioning state and/or the driving mode of the vehicle, the accuracy of the remaining driving range display reference value is effectively improved, the calculation accuracy is improved, the practicability and the applicability of the vehicle are improved, and the use experience of a user is improved.

The embodiment of the invention provides a vehicle control unit, which comprises the vehicle remaining driving range display device. The vehicle control unit can detect the current SOC value of the power battery, acquire the mileage difference value between the current remaining driving range calculation value and the remaining driving range display reference value, acquire the current SOC value and the updating rate of the remaining driving range display reference value under the difference value according to the current SOC value, the difference value and the first relation, update the remaining driving range display reference value according to the updating rate of the remaining driving range display reference value, and correct the remaining driving range display reference value according to the air conditioning state and/or the driving mode of the vehicle, so that the accuracy of the remaining driving range display reference value is effectively improved, the calculation accuracy is improved, the practicability and the applicability of the vehicle are improved, and the use experience of a user is improved.

The embodiment of the invention provides a vehicle, which comprises the vehicle control unit. The vehicle can detect the current SOC value of the power battery, and acquire the mileage difference value between the current remaining driving range calculation value and the remaining driving range display reference value, so as to acquire the current SOC value and the updating rate of the remaining driving range display reference value under the difference value according to the current SOC value, the difference value and the first relation, so as to update the remaining driving range display reference value according to the updating rate of the remaining driving range display reference value, and correct the remaining driving range display reference value according to the air conditioning state and/or the driving mode of the vehicle, thereby effectively improving the accuracy of the remaining driving range display reference value, improving the calculation accuracy, improving the practicability and the applicability of the vehicle, and improving the use experience of a user.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A method for displaying a remaining driving range of a vehicle, comprising the steps of:

acquiring a current SOC value of the power battery;

acquiring a current residual driving range calculation value and a residual driving range display reference value to obtain a difference value between the current residual driving range calculation value and the residual driving range display reference value; and

acquiring the current SOC value and the corresponding updating rate of the residual driving range display reference value under the difference value according to the current SOC value, the difference value and the first relation; wherein the first relationship is a relationship between the SOC value, the mileage difference value and the update rate of the remaining driving range display reference value;

and obtaining an update rate reference value of the residual driving range display reference value, wherein the specific steps comprise:

charging a power battery within a preset time length, obtaining the increment of a display reference value of the remaining driving range within the preset time length according to the rated driving range value of the vehicle and the SOC increment within the preset time length, and obtaining an update rate reference value of the display reference value of the remaining driving range within the preset time length according to the preset time length and the increment of the display reference value of the remaining driving range within the preset time length;

and charging the power battery for multiple times, acquiring a sampling SOC value and a sampling difference value after each charging, and an updating rate of a residual driving range display reference value corresponding to the sampling SOC value and the sampling difference value, and establishing the first relation by taking the updating rate reference value as a limit value.

2. The remaining range display method of a vehicle according to claim 1, characterized by further comprising:

detecting a current driving mode and/or an air conditioning state of the vehicle;

obtaining a correction coefficient for correcting a driving range display reference value according to the current driving mode and/or the air conditioner state;

and correcting the current driving range display reference value according to the correction coefficient to obtain the actual residual driving range display value of the vehicle.

3. A remaining driving range display device of a vehicle, characterized by comprising:

the first detection module is used for detecting the current SOC value of the power battery;

the calculation module is used for acquiring a current residual driving range calculation value and a residual driving range display reference value so as to acquire a corresponding range difference value between the current residual driving range calculation value and the residual driving range display reference value; and

the first obtaining module is used for obtaining the current SOC value and the corresponding updating rate of the remaining driving range display reference value under the difference value according to the current SOC value, the difference value and a first relation; wherein the first relationship is a relationship among the SOC value, the mileage difference value and the remaining driving range display reference value updating rate;

the second acquisition module is used for acquiring an update rate reference value of the residual driving range display reference value;

the charging module is used for charging the power battery within a preset time length;

the third obtaining module is used for obtaining the increment of the residual driving range display reference value in the preset duration according to the rated driving range value of the vehicle and the SOC increment in the preset duration;

the fourth obtaining module is used for obtaining an updating rate reference value of the remaining driving range display reference value in the preset duration according to the preset duration and the increment of the remaining driving range display reference value in the preset duration;

and the establishing module is used for charging the power battery for multiple times, acquiring a sampling SOC value and a sampling difference value after each charging, and the updating rate of the residual driving range display reference value corresponding to the sampling SOC value and the sampling difference value, and establishing the first relation by taking the updating rate reference value as a limit value.

4. The remaining range display device of a vehicle according to claim 3, characterized by further comprising:

the second detection module is used for detecting the current driving mode and/or the air conditioner state of the vehicle;

the fourth acquisition module is used for acquiring a correction coefficient for correcting a driving range display reference value according to the current driving mode and/or the air conditioner state;

and the correction module is used for correcting the current driving range display reference value according to the correction coefficient so as to obtain the actual residual driving range display value of the vehicle.

5. A vehicle control unit, comprising: the remaining range display device of the vehicle according to any one of claims 3 to 4.

6. A vehicle, characterized by comprising: the vehicle control unit of claim 5.