CN116442801A - Vehicle speed limit method, device, vehicle and storage medium - Google Patents

Abstract

The present application relates to the field of vehicle technologies, and in particular, to a vehicle speed limiting method and device, a vehicle, and a storage medium, where the method includes: judging whether the current vehicle meets a preset vehicle speed limit condition, if the current vehicle meets the preset vehicle speed limit condition, acquiring the current temperature of a storage battery of the current vehicle, the current power supply voltage of the storage battery and the opening states of a plurality of low-voltage loads of the whole vehicle, matching an optimal discharging curve from a plurality of preset discharging curves according to the current temperature, the current power supply voltage and the opening states of the plurality of low-voltage loads, calculating the residual discharging time of the storage battery according to the optimal discharging curve, and adjusting the vehicle speed of the current vehicle to the preset minimum safe vehicle speed in the residual discharging time. Therefore, the problem that vehicle power is lost due to the fact that the vehicle speed is not limited or the vehicle speed is not limited properly when the electric quantity of the storage battery cannot be obtained is solved, the electric quantity of the storage battery is prevented from being too low, guarantee is provided for driving safety of a user, and traffic accidents are reduced.

Description

Vehicle speed limit method, device, vehicle and storage medium

technical field

The present application relates to the technical field of vehicles, in particular to a vehicle speed limit method, device, vehicle and storage medium.

Background technique

After the vehicle is powered on, the DC conversion device can be used to consume the power of the power battery to charge the 12V battery and supply power to the low-voltage system at the same time. After the vehicle is powered off, the 12V battery supplies power to the low-voltage system. When the hardware fails, the power battery cannot charge the 12V battery, and the vehicle controller cannot obtain the power status of the 12V battery. If the 12V battery is dead or the power is lower than a certain value, the vehicle will lose power.

In the related art, when the DC conversion device and the battery sensor have a communication failure or a hardware failure at the same time, the vehicle speed is generally not limited or the vehicle speed is limited through a set gradient.

However, if the vehicle speed is not limited, the 12V battery will be dead or the power will be lower than a certain value, resulting in the vehicle losing power. However, if the vehicle speed is limited through the set gradient, there will also be a certain probability that the battery will be dead or the power will be lower than a certain value. A certain value will cause the vehicle to lose power, which needs to be solved urgently.

Contents of the invention

In view of this, the present invention aims to propose a vehicle speed limit method for vehicles, which solves the problem in the related art that when the battery power cannot be obtained, the vehicle power is lost due to unrestricted vehicle speed or improper speed limit, and avoids battery power loss. If it is too low, it can guarantee the driving safety of users and reduce the occurrence of traffic accidents.

In order to achieve the above object, technical solution of the present invention is achieved in that way:

A speed limit method for a vehicle, comprising:

Determine whether the current vehicle meets the preset speed limit condition;

If the current vehicle satisfies the preset vehicle speed limit condition, then acquire the current temperature of the battery of the current vehicle, the current power supply voltage of the battery, and the on-state of multiple low-voltage loads of the vehicle; and

Matching an optimal discharge curve from a plurality of preset discharge curves according to the current temperature, the current supply voltage, and the on-states of the plurality of low-voltage loads, and calculating the remaining capacity of the storage battery according to the optimal discharge curve discharge time, and within the remaining discharge time, adjust the vehicle speed of the current vehicle to a preset minimum safe vehicle speed.

Further, in some embodiments, before matching the optimal discharge curve from the plurality of preset discharge curves according to the current temperature, the current supply voltage and the on-states of the plurality of low-voltage loads ,Also includes:

Obtain the load power of each low-voltage load;

determining a plurality of load power types according to the load power of each low-voltage load and the on-states of the plurality of low-voltage loads;

Based on the multiple load power types, different load powers are loaded on batteries at different temperatures, and a discharge curve when the battery is consumed to the minimum safe voltage is obtained to obtain the multiple preset discharge curves.

Further, in some embodiments, the adjusting the vehicle speed of the current vehicle to a preset minimum safe vehicle speed within the remaining discharge time includes:

calculating the difference between the current vehicle speed and the preset minimum safe vehicle speed;

A vehicle speed decrease rate is obtained according to the ratio of the difference to the remaining discharge time, and the vehicle speed of the current vehicle is adjusted to a preset minimum safe vehicle speed according to the vehicle speed decrease rate.

Further, in some embodiments, when adjusting the vehicle speed of the current vehicle to the preset minimum safe vehicle speed within the remaining discharge time, the method also includes:

judging whether the current power supply voltage reaches the minimum safe voltage during the current vehicle deceleration process;

If the current power supply voltage reaches the minimum safe voltage during the deceleration process of the current vehicle, limiting the running of the current vehicle at the preset minimum safe vehicle speed.

Further, in some embodiments, after adjusting the current vehicle speed to the preset minimum safe vehicle speed, the method further includes:

Obtain the open status of each low-voltage load at the current moment;

Comparing whether the open state of each low-voltage load at the current moment is the same as the open state of each low-voltage load at the previous moment;

When the result of the comparison is that the on-state of at least one low-voltage load at the current moment is different from that at the previous moment, it is re-judged whether the current vehicle meets the preset vehicle speed limit condition.

Further, in some embodiments, the judging whether the current vehicle meets the preset speed limit condition includes:

Judging whether the fault message signal of the DC conversion device and the fault message signal of the battery sensor are received;

If the fault message signal of the DC conversion device and the fault message signal of the battery sensor are received, it is determined that the current vehicle satisfies the preset vehicle speed limit condition.

Further, in some embodiments, after the current vehicle meets the preset vehicle speed limit condition, the method further includes:

Generate speed reduction reminder information based on the preset vehicle speed limit condition;

Based on the speed reduction reminder information, the current vehicle is controlled to perform a speed reduction reminder.

Compared with the prior art, the speed limit method of the vehicle of the present invention has the following advantages:

The vehicle speed limit method of the present invention matches the optimal discharge curve based on the current temperature of the battery, the current power supply voltage and the open states of a plurality of low-voltage loads when it is judged that the current vehicle meets the speed limit condition, so as to achieve optimal discharge The current vehicle speed is adjusted to the minimum safe speed within the remaining discharge time corresponding to the curve, which solves the problem in related technologies that the vehicle power is lost due to unrestricted vehicle speed or improper speed limit when the battery power cannot be obtained, and avoids the battery power being too high. Low, provide guarantee for the user's driving safety and reduce the occurrence of traffic accidents.

Another object of the present invention is to propose a vehicle speed limiting device, which solves the problem in the related art that when the battery power cannot be obtained, the vehicle power is lost due to unrestricted vehicle speed or improper speed limit, and avoids excessive battery power. Low, provide guarantee for the user's driving safety and reduce the occurrence of traffic accidents.

In order to achieve the above object, technical solution of the present invention is achieved in that way:

A speed limiting device for a vehicle, comprising:

The first judging module is used to judge whether the current vehicle satisfies the preset speed limit condition;

An acquisition module, configured to acquire the current temperature of the storage battery of the current vehicle, the current power supply voltage of the storage battery, and the on-state of multiple low-voltage loads of the entire vehicle when the current vehicle meets the preset vehicle speed limit condition ;as well as

The first speed limiting module is configured to match the optimal discharge curve from multiple preset discharge curves according to the current temperature, the current supply voltage, and the on-states of the multiple low-voltage loads, and according to the optimal The discharge curve calculates the remaining discharge time of the storage battery, and within the remaining discharge time, adjusts the vehicle speed of the current vehicle to a preset minimum safe vehicle speed.

Further, in some embodiments, before matching the optimal discharge curve from the plurality of preset discharge curves according to the current temperature, the current supply voltage and the on-states of the plurality of low-voltage loads , the first speed limiting module is also used for:

Obtain the load power of each low-voltage load;

determining a plurality of load power types according to the load power of each low-voltage load and the on-states of the plurality of low-voltage loads;

Based on the multiple load power types, different load powers are loaded on batteries at different temperatures, and a discharge curve when the battery is consumed to the minimum safe voltage is obtained to obtain the multiple preset discharge curves.

Further, in some embodiments, the first speed limiting module is also used for:

calculating the difference between the current vehicle speed and the preset minimum safe vehicle speed;

A vehicle speed decrease rate is obtained according to the ratio of the difference to the remaining discharge time, and the vehicle speed of the current vehicle is adjusted to a preset minimum safe vehicle speed according to the vehicle speed decrease rate.

Further, in some embodiments, when adjusting the vehicle speed of the current vehicle to the preset minimum safe vehicle speed within the remaining discharge time, the method also includes:

A second judging module, configured to judge whether the current power supply voltage reaches the minimum safe voltage during the current vehicle deceleration process;

The second speed limiting module is configured to limit the running of the current vehicle at the preset minimum safe vehicle speed when the current power supply voltage reaches the minimum safe voltage during the deceleration process of the current vehicle.

Further, in some embodiments, after adjusting the current vehicle speed to the preset minimum safe vehicle speed, the first speed limiting module is further configured to:

Obtain the open status of each low-voltage load at the current moment;

Comparing whether the open state of each low-voltage load at the current moment is the same as the open state of each low-voltage load at the previous moment;

When the result of the comparison is that the on-state of at least one low-voltage load at the current moment is different from that at the previous moment, it is re-judged whether the current vehicle meets the preset vehicle speed limit condition.

Further, in some embodiments, the first judging module is specifically used for:

Judging whether the fault message signal of the DC conversion device and the fault message signal of the battery sensor are received;

If the fault message signal of the DC conversion device and the fault message signal of the battery sensor are received, it is determined that the current vehicle satisfies the preset vehicle speed limit condition.

Further, in some embodiments, after the current vehicle satisfies the preset vehicle speed limit condition, the first judging module is further configured to:

Generate speed reduction reminder information based on the preset vehicle speed limit condition;

Based on the speed reduction reminder information, the current vehicle is controlled to perform a speed reduction reminder.

The vehicle speed limiting device described above has the same advantages as the above vehicle speed limiting method over the prior art, and will not be repeated here.

Another object of the present invention is to propose a vehicle, which solves the problem in the related art that the power of the vehicle is lost due to unrestricted vehicle speed or improper speed limit when the battery power cannot be obtained, so as to avoid the low power of the battery and provide users with Provide guarantee for driving safety and reduce the occurrence of traffic accidents.

In order to achieve the above object, technical solution of the present invention is achieved in that way:

A vehicle, comprising: a memory, a processor, and a computer program stored on the memory and operable on the processor, and the processor executes the program to realize the vehicle as described in the above-mentioned embodiments Speed limit method.

The vehicle described above has the same advantages as the vehicle speed limiting method of the vehicle above compared with the prior art, and will not be repeated here.

Another object of the present invention is to propose a computer-readable storage medium.

In order to achieve the above object, technical solution of the present invention is achieved in that way:

A computer-readable storage medium stores a computer program thereon, and the program is executed by a processor to implement the speed limit method for a vehicle as described in the above-mentioned embodiments.

The computer-readable storage medium has the same advantages as the above-mentioned vehicle speed limit method compared with the prior art, and will not be repeated here.

Description of drawings

The drawings constituting a part of the present invention are used to provide a further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the attached picture:

Fig. 1 is the flow chart of the speed limit method of the vehicle of the embodiment of the present invention;

2 is a schematic diagram of a vehicle power supply system according to an embodiment of the present invention;

Fig. 3 is the schematic diagram of the discharge curve of an embodiment of the present invention;

Fig. 4 is the flowchart of obtaining discharge curve according to one embodiment of the present invention;

5 is a flow chart of a vehicle speed limit method for a vehicle according to an embodiment of the present invention;

6 is a schematic diagram of a vehicle speed limiting device of a vehicle according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of a vehicle according to an embodiment of the present invention.

Explanation of reference numerals: 10-vehicle speed limit device, 100-first judgment module, 200-acquisition module, 300-first speed limit module, 701-memory, 702-processor and 703-communication interface.

Detailed ways

It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

The present invention will be described in detail below with reference to the accompanying drawings and examples.

Fig. 1 is a flow chart of a method for limiting vehicle speed of a vehicle according to an embodiment of the present invention.

As shown in Figure 1, the method for limiting the speed of a vehicle according to an embodiment of the present invention includes the following steps:

Step S101, judging whether the current vehicle satisfies the preset vehicle speed limit condition.

Optionally, in some embodiments, the judging whether the current vehicle meets the preset vehicle speed limit condition includes: judging whether the fault message signal of the DC conversion device and the fault message signal of the battery sensor are received; The fault message signal of the DC conversion device and the fault message signal of the battery sensor determine that the current vehicle satisfies the preset vehicle speed limit condition.

Among them, the fault message signal of the DC conversion device can be automatically generated when the DC conversion device fails, and the DC conversion device sends the fault message signal of the DC conversion device to the vehicle controller; the fault message signal of the battery sensor can be Automatically generated when the battery sensor fails, and the battery sensor sends the fault message signal of the battery sensor to the vehicle controller.

It should be understood that, as shown in FIG. 2 , FIG. 2 is a schematic structural diagram of a power supply system of a vehicle according to an embodiment of the present invention. The vehicle's 12V power supply can be composed of a 12V battery and a DC conversion device (Direct Current/Direct Current, referred to as DC/DC). The vehicle controller is connected to the DC conversion device and the battery sensor. After the vehicle is powered on, the DC conversion device is used to consume the power battery. The electricity charged to the 12V battery supplies power to the low-voltage system at the same time. After the vehicle is powered off, the 12V battery supplies power to the low-voltage system. When the DC conversion device and the battery sensor have communication failures or hardware failures at the same time, the power battery cannot charge the 12V battery, and the vehicle controller cannot obtain the power status of the 12V battery. If the 12V battery is dead or the power is lower than a certain value At this time, the vehicle will lose power, which will easily lead to traffic accidents.

Therefore, in order to ensure the safety of the vehicle, the embodiments of the present invention need to monitor the DC conversion device and the battery sensor through the vehicle controller. When the vehicle controller receives the DC conversion device fault message signal and When the battery sensor sends a battery sensor failure message signal, it is determined that both the DC conversion device and the battery sensor are faulty, that is, the preset vehicle speed limit condition is met, and the vehicle speed is limited, thereby avoiding loss of power and reducing traffic accidents happened.

Step S102, if the current vehicle satisfies the preset vehicle speed limit condition, obtain the current temperature of the battery of the current vehicle, the current power supply voltage of the battery and the on-state of multiple low-voltage loads of the vehicle.

Wherein, the low-voltage load is a load powered by a 12V battery. For example, the low-voltage load may include a dashboard, a sunroof, a headlight, a seat, etc. of a current vehicle.

It is understandable that when the current vehicle meets the preset speed limit condition, it means that both the DC conversion device and the battery sensor are faulty, and at this time the power status of the current vehicle cannot be obtained; The embodiment of the present invention can determine the service time of the battery, and the service time of the battery can be obtained through the discharge curve of the battery. Therefore, the embodiment of the present invention can obtain the current temperature of the battery of the current vehicle, the current power supply voltage of the battery Based on the current temperature of the battery, the current supply voltage of the battery, and the on-state of multiple low-voltage loads of the vehicle, the discharge curve of the battery is obtained, so as to realize the battery discharge curve based on the service time of the battery. Monitor to avoid low battery conditions.

Step S103, matching the optimal discharge curve from multiple preset discharge curves according to the current temperature, the current supply voltage and the on-state of multiple low-voltage loads, and calculating the remaining discharge time of the battery according to the optimal discharge curve, and the remaining discharge time Adjust the current vehicle speed to the preset minimum safe vehicle speed within the specified time.

Among them, the discharge curve is a discharge curve obtained when different load powers are loaded on batteries at different temperatures, and the battery is consumed to the lowest safe voltage. The embodiment of the present invention will generate a plurality of preset discharge curves later. To elaborate; the optimal discharge curve is a discharge curve selected from a plurality of preset discharge curves that is closest to the current temperature, the current supply voltage and the on-states of the multiple low-voltage loads.

Specifically, as shown in FIG. 3 , the embodiment of the present invention can pre-generate multiple discharge curves (such as discharge curve A, discharge curve B, and discharge curve C) for the battery of the current vehicle, that is, multiple preset discharge curves, and After acquiring the current temperature of the storage battery, the current supply voltage and the on-states of multiple low-voltage loads, matching is performed from multiple preset discharge curves based on the current temperature, the current supply voltage, and the on-states of multiple low-voltage loads, and The discharge curve closest to the current temperature, the current supply voltage and the on-state of multiple low-voltage loads in the matching results is taken as the optimal discharge curve, so that the storage battery can be read based on the preset multiple discharge curves shown in Figure 3 The remaining discharge time of the battery is used to calculate the speed drop rate of the current vehicle based on the remaining discharge time of the battery, so that the speed of the current vehicle is adjusted to the preset minimum safe speed, so that when both the DC conversion device and the battery sensor fail, Control the speed of the vehicle to provide a guarantee for the user's driving safety.

Among them, there are many ways to calculate the speed drop rate of the current vehicle based on the remaining discharge time of the battery.

As a possible implementation, in some embodiments, within the remaining discharge time, adjusting the current vehicle speed to a preset minimum safe vehicle speed includes: calculating the difference between the current vehicle speed and the preset minimum safe vehicle speed value; according to the ratio of the difference to the remaining discharge time, the vehicle speed decrease rate is obtained, and the current vehicle speed is adjusted to the preset minimum safe vehicle speed according to the vehicle speed decrease rate.

Wherein, the preset minimum safe vehicle speed is a vehicle speed that will not cause the battery power to be too low and can ensure safe driving of the vehicle.

Specifically, the embodiment of the present application can obtain the current vehicle speed of the current vehicle, make a difference between the current vehicle speed and the preset minimum safe vehicle speed, and use the ratio of the difference obtained by the difference to the remaining discharge time as the vehicle speed drop rate, for example, The current speed of the current vehicle is 70km/h, the preset minimum safe speed is 20km/h, and the remaining discharge time is 10min, then the speed drop rate is (70-20)km/h/10min, so based on the calculated speed The descent rate adjusts the current vehicle speed of the vehicle, so that the current vehicle speed is adjusted to a preset minimum safe vehicle speed within the remaining discharge time.

Therefore, when it is judged that the current vehicle meets the vehicle speed limit condition, the optimal discharge curve is matched based on the current temperature of the battery, the current supply voltage and the on-state of multiple low-voltage loads, so that within the remaining discharge time corresponding to the optimal discharge curve, the The speed of the current vehicle is adjusted to the minimum safe speed, which solves the problem in the related technology that when the battery power cannot be obtained, the vehicle power is lost due to unrestricted speed or improper speed limit, avoids the low power of the battery, and provides driving safety for users. Guaranteed to reduce the occurrence of traffic accidents.

Furthermore, when the vehicle speed of the current vehicle is adjusted to the preset minimum safe vehicle speed within the remaining discharge time, the power supply voltage of the current vehicle may change suddenly due to the running state of the vehicle. During the process of adjusting the current vehicle speed to the preset minimum safe vehicle speed within a certain period of time, the current power supply voltage is monitored.

Optionally, in some embodiments, when adjusting the vehicle speed of the current vehicle to the preset minimum safe vehicle speed within the remaining discharge time, it also includes: judging whether the current power supply voltage reaches the minimum safe voltage during the deceleration process of the current vehicle; If the current power supply voltage reaches the minimum safe voltage during the deceleration process of the current vehicle, the running of the current vehicle is restricted at the preset minimum safe vehicle speed.

That is to say, in order to ensure driving safety, as long as the current power supply voltage reaches the minimum safe voltage during the current vehicle deceleration process, the embodiment of the present invention no longer adjusts the current vehicle speed to the preset minimum safe vehicle speed according to the vehicle speed deceleration rate. , but immediately restricts the current vehicle to travel according to the preset minimum safe speed, so as to ensure the safety of driving.

It should be noted that, in the embodiment of the present invention, during the process of limiting the current vehicle to the preset minimum safe vehicle speed, adaptive adjustments can also be made to the low-voltage load of the vehicle, for example, the seat heating can be turned off, the brightness of the instrument can be reduced, etc. , thereby reducing the consumption of battery power.

Further, in some embodiments, in order to ensure the accuracy and accuracy of the remaining usage time of the current vehicle battery, the embodiment of the present invention can continuously obtain the current time every The on-state of each low-voltage load, and compare whether the on-state of each low-voltage load at the current moment is the same as that of each low-voltage load at the previous moment; the result of the comparison is that the on-state of at least one low-voltage load at the current moment is different from that at the previous moment. At the same time, it is re-judged whether the current vehicle meets the preset speed limit condition.

Specifically, the embodiment of the present application can monitor the opening state of each low-voltage load in real time throughout the entire process. For example, if the seat heating is off at the current moment and the previous seat heating is on, it means that there is an opening state of the low-voltage load at this time. For another example, if the brightness of the instrument panel at the current moment is 80, and the brightness of the instrument panel at the previous moment is 60, it means that there is also a change in the open state of the low-voltage load at this time. In order to ensure the accuracy and accuracy of the remaining service time of the current vehicle battery The embodiment of the present invention re-judges whether the current vehicle meets the preset vehicle speed limit condition, and matches the new optimal discharge curve when the preset vehicle speed limit condition is met, so that the remaining discharge rate corresponding to the new optimal discharge curve Adjust the speed of the current vehicle to the preset minimum safe speed within the specified time.

Further, in order to facilitate those skilled in the art to understand the process of obtaining the discharge curve in the embodiment of the present invention, the following describes in detail the process of obtaining multiple preset discharge curves in combination with specific embodiments.

Optionally, in some embodiments, before matching the optimal discharge curve from a plurality of preset discharge curves according to the current temperature, the current supply voltage, and the on-state of the multiple low-voltage loads, the method further includes: acquiring each low-voltage load load power; determine multiple load power types according to the load power of each low-voltage load and the open status of multiple low-voltage loads; based on multiple load power types, load different load powers on batteries at different temperatures, and obtain battery The discharge curve when it is consumed to the lowest safe voltage, and multiple preset discharge curves are obtained.

Among them, the load power type may include: basic load power, normal load power and maximum load power, where the basic load refers to the load under the premise that the user does not turn on various functions such as seat heating and headlights, etc., and the normal load is It refers to the load under the premise that some functions are enabled by the user, and the maximum load refers to the load under the premise that all functions are enabled by the user.

Specifically, in the embodiment of the present application, three load power types can be set according to the low-voltage load of the vehicle where the battery is located. In the embodiment of the present invention, when the state of charge (State Of Charge, SOC) of the battery is 100%, the base load The power is added to the batteries at different temperatures, and the batteries are consumed to the lowest safe voltage; when the state of charge (State Of Charge, SOC) of the batteries is 100%, the conventional load power is added to the batteries at different temperatures , and consume the battery to the lowest safe voltage, the second discharge curve can be obtained; when the state of charge (State Of Charge, SOC) of the battery is 100%, add the maximum load power to the battery at different temperatures , and consume the battery to the lowest safe voltage, so that multiple preset discharge curves can be obtained.

Specifically, as shown in FIG. 4, FIG. 4 is a flow chart of obtaining a discharge curve according to an embodiment of the present invention, and obtaining a discharge curve includes the following steps:

Step S401, obtaining the power of each low-voltage load of the vehicle.

Step S402, based on the obtained power of each low-voltage load, multiple different load powers are obtained according to the power of each low-voltage load, such as base load power, normal load power and maximum load power.

Step S403, based on multiple different temperatures, respectively load multiple different load powers on the storage battery and consume the storage battery to the lowest safe voltage to obtain multiple preset discharge curves.

It should be noted that the multiple discharge curves shown in Figure 3 are only exemplary, not as a limitation to the present invention, and because different batteries have different levels of load capacity, and the actual load required by the vehicle to turn on different loads The power is also different. In order to further improve the accuracy of the optimal discharge curve matching, the embodiment of the present application can set more load power types according to actual needs, so that more discharge curves can be obtained, that is, those skilled in the art According to the actual situation, the battery discharge curve in line with the current vehicle can be obtained.

Further, in some embodiments, after the current vehicle meets the preset vehicle speed limit condition, it also includes: generating speed reduction reminder information based on the preset vehicle speed limit condition; based on the speed reduction reminder information, controlling the current vehicle to slow down remind.

That is to say, after it is determined that the DC conversion device and the battery sensor are both faulty, the embodiment of the present invention can generate a speed reduction reminder message to remind the current driver to perform a corresponding speed reduction operation to ensure driving safety.

Specifically, the embodiment of the present application can send speed reduction reminder information by controlling the acoustic reminder device of the current vehicle, or the optical reminder device, or both the acoustic reminder device and the optical reminder device, wherein the acoustic reminder device can be a vehicle stereo, etc., and the optical reminder device The device may be a diode, a display screen, etc., and is not specifically limited here. In addition, this application does not specifically limit the content of the speed reduction reminder information. Those skilled in the art can set it according to the actual situation. For example, the dashboard can prompt the user to go to the 4S shop for maintenance, etc., so as to provide guarantee for the driving safety of the driver. . Further, in order to facilitate those skilled in the art to further understand the vehicle speed limit method of the embodiment of the present application, the following will be described in conjunction with specific embodiments.

Specifically, as shown in Figure 5, the speed limit method of the vehicle includes the following steps:

Step S501, the vehicle runs normally.

Step S502, acquiring state data of the DC conversion device and the battery sensor.

Step S503, judging whether the DC conversion device and the battery sensor fail at the same time, if yes, execute step S504, otherwise execute step S501.

In step S504, the vehicle controller obtains the current supply voltage of the storage battery and the on-state of the low-voltage load of the vehicle.

Step S505, according to the power supply voltage of the battery and the open state of the low-voltage load of the vehicle, combined with the current battery temperature, select the optimal discharge curve from a plurality of preset discharge curves, and calculate the remaining discharge time T according to the optimal discharge curve, and Decrease the vehicle speed to the preset minimum safe vehicle speed within T time, and immediately reduce the vehicle speed to the preset minimum safe vehicle speed when it is detected that the power supply voltage has reached the minimum safe voltage during the deceleration process.

In step S506, the vehicle controller acquires the on-state of each low-voltage load in the vehicle in real time, and judges whether it has changed. If the on-state of any low-voltage load changes, execute step S503; otherwise, continue to execute step S506.

According to the speed limit method of the vehicle in the embodiment of the present invention, when it is judged that the current vehicle meets the speed limit condition, the optimal discharge curve is matched based on the current temperature of the battery, the current power supply voltage and the open state of multiple low-voltage loads, thereby The current vehicle speed is adjusted to the minimum safe speed within the remaining discharge time corresponding to the discharge curve, which solves the problem in the related technology that the vehicle power is lost due to unrestricted or improper speed limit when the battery power cannot be obtained, and avoids battery power loss. If it is too low, it can guarantee the driving safety of users and reduce the occurrence of traffic accidents.

Further, as shown in FIG. 6 , the embodiment of the present invention also discloses a vehicle speed limiting device 10 , which includes: a first judging module 100 , an obtaining module 200 and a first speed limiting module 300 .

Specifically, as shown in FIG. 6 , the first judgment module 100 is used to judge whether the current vehicle meets the preset speed limit condition; the acquisition module 200 is used to obtain the current speed limit condition when the current vehicle meets the preset speed limit condition The current temperature of the battery of the vehicle, the current supply voltage of the battery, and the on-state of multiple low-voltage loads of the vehicle; Match the optimal discharge curve among the multiple discharge curves set, and adjust the current vehicle speed to the preset minimum safe vehicle speed within the remaining discharge time according to the remaining discharge time calculated by the optimal battery discharge curve.

Optionally, in some embodiments, before matching the optimal discharge curve from multiple preset discharge curves according to the current temperature, the current supply voltage and the on-state of multiple low-voltage loads, the first speed limiting module 300 further Used to: obtain the load power of each low-voltage load; determine multiple load power types according to the load power of each low-voltage load and the on-state of multiple low-voltage loads; load different load powers at different temperatures based on multiple load power types On the lower battery, and obtain the discharge curve when the battery is consumed to the lowest safe voltage, and obtain multiple preset discharge curves.

Optionally, in some embodiments, the first speed limiting module 300 is also used to: calculate the difference between the current vehicle speed and the preset minimum safe vehicle speed; obtain the vehicle speed drop rate according to the ratio of the difference to the remaining discharge time , and adjust the current vehicle speed to the preset minimum safe vehicle speed according to the vehicle speed drop rate.

Optionally, in some embodiments, when the vehicle speed of the current vehicle is adjusted to the preset minimum safe vehicle speed within the remaining discharge time, it also includes: a second judging module, configured to judge the current power supply during the deceleration process of the current vehicle Whether the voltage reaches the minimum safe voltage; the second speed limiting module is used to limit the current vehicle to travel at the preset minimum safe speed when the current power supply voltage reaches the minimum safe voltage during the deceleration process of the current vehicle.

Optionally, in some embodiments, after adjusting the current vehicle speed to the preset minimum safe vehicle speed, the first speed limiting module 300 is also used to: obtain the open state of each low-voltage load at the current moment; compare the current Whether the opening state of each low-voltage load at the moment is the same as the opening state of each low-voltage load at the previous moment; when the result of the comparison is that the opening state of at least one low-voltage load at the current moment is different from the previous moment, re-judgment whether the current vehicle meets the preset speed limit conditions.

Optionally, in some embodiments, the first judging module 100 is specifically used to: judge whether the fault message signal of the DC conversion device and the fault message signal of the battery sensor are received; if the fault message signal of the DC conversion device is received text signal and the fault message signal of the battery sensor, it is determined that the current vehicle meets the preset speed limit condition.

Optionally, in some embodiments, after the current vehicle meets the preset vehicle speed limit condition, the first judging module 100 is further configured to: generate speed reduction reminder information based on the preset vehicle speed limit condition; Information, control the current vehicle to remind you to slow down.

It should be noted that, the specific implementation manner of the vehicle speed limiting device in the embodiment of the present invention is similar to the specific implementation manner of the vehicle speed limiting method, and will not be repeated here to reduce redundancy.

According to the vehicle speed limiting device of the embodiment of the present invention, when it is judged that the current vehicle satisfies the vehicle speed limit condition, it matches the optimal discharge curve based on the current temperature of the battery, the current power supply voltage and the on-state of multiple low-voltage loads, so that The current vehicle speed is adjusted to the minimum safe speed within the remaining discharge time corresponding to the discharge curve, which solves the problem in the related technology that the vehicle power is lost due to unrestricted or improper speed limit when the battery power cannot be obtained, and avoids battery power loss. If it is too low, it can guarantee the driving safety of users and reduce the occurrence of traffic accidents.

Further, FIG. 7 is a schematic structural diagram of a vehicle provided in an embodiment of the present application. The vehicle can include:

A memory 701 , a processor 702 , and a computer program stored in the memory 701 and executable on the processor 702 .

When the processor 702 executes the program, the vehicle speed limit method provided in the above-mentioned embodiments is implemented.

Further, the vehicle also includes:

The communication interface 703 is used for communication between the memory 701 and the processor 702 .

The memory 701 is used to store computer programs that can run on the processor 702 .

The memory 701 may include a high-speed RAM (Random Access Memory, random access memory) memory, and may also include a non-volatile memory, such as at least one disk memory.

If the memory 701, the processor 702, and the communication interface 703 are implemented independently, the communication interface 703, the memory 701, and the processor 702 may be connected to each other through a bus to complete mutual communication. The bus may be an ISA (Industry Standard Architecture, industry standard architecture) bus, a PCI (Peripheral Component, external device interconnection) bus, or an EISA (Extended Industry Standard Architecture, extended industry standard architecture) bus, etc. The bus can be divided into address bus, data bus, control bus and so on. For ease of representation, only one thick line is used in FIG. 7 , but it does not mean that there is only one bus or one type of bus.

Optionally, in specific implementation, if the memory 701, processor 702, and communication interface 703 are integrated on one chip, then the memory 701, processor 702, and communication interface 703 can communicate with each other through the internal interface.

The processor 702 may be a CPU (Central Processing Unit, central processing unit), or an ASIC (Application Specific Integrated Circuit, specific integrated circuit), or one or more integrated circuits configured to implement the embodiments of the present application.

Further, the embodiment of the present invention also discloses a computer-readable storage medium, on which a computer program is stored, and the program is executed by a processor, so as to implement the vehicle speed limit method of the above-mentioned embodiment.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (10)

1. a speed limit method of vehicle, is characterized in that, comprises the following steps: Determine whether the current vehicle meets the preset speed limit condition; If the current vehicle satisfies the preset vehicle speed limit condition, then acquire the current temperature of the battery of the current vehicle, the current power supply voltage of the battery, and the on-state of multiple low-voltage loads of the vehicle; and Matching an optimal discharge curve from a plurality of preset discharge curves according to the current temperature, the current supply voltage, and the on-states of the plurality of low-voltage loads, and calculating the remaining capacity of the storage battery according to the optimal discharge curve discharge time, and within the remaining discharge time, adjust the vehicle speed of the current vehicle to a preset minimum safe vehicle speed. 2. The vehicle speed limiting method of the vehicle according to claim 1, characterized in that, in the open state according to the current temperature, the current power supply voltage and the plurality of low-voltage loads, discharge Before matching the optimal discharge curve in the curve, it also includes: Obtain the load power of each low-voltage load; determining a plurality of load power types according to the load power of each low-voltage load and the on-states of the plurality of low-voltage loads; Based on the multiple load power types, different load powers are loaded on batteries at different temperatures, and a discharge curve when the battery is consumed to the minimum safe voltage is obtained to obtain the multiple preset discharge curves. 3. The method for limiting vehicle speed of a vehicle according to claim 1, wherein the adjusting the vehicle speed of the current vehicle to a preset minimum safe vehicle speed within the remaining discharge time comprises: calculating the difference between the current vehicle speed and the preset minimum safe vehicle speed; A vehicle speed decrease rate is obtained according to the ratio of the difference to the remaining discharge time, and the vehicle speed of the current vehicle is adjusted to a preset minimum safe vehicle speed according to the vehicle speed decrease rate. 4. The method for limiting vehicle speed of a vehicle according to claim 1, characterized in that, when adjusting the vehicle speed of the current vehicle to the preset minimum safe vehicle speed within the remaining discharge time, further comprising: judging whether the current power supply voltage reaches the minimum safe voltage during the current vehicle deceleration process; If the current power supply voltage reaches the minimum safe voltage during the deceleration process of the current vehicle, limiting the running of the current vehicle at the preset minimum safe vehicle speed. 5. The method for limiting vehicle speed of a vehicle according to claim 1 or 4, characterized in that, after adjusting the vehicle speed of the current vehicle to the preset minimum safe vehicle speed, further comprising: Obtain the open status of each low-voltage load at the current moment; Comparing whether the open state of each low-voltage load at the current moment is the same as the open state of each low-voltage load at the previous moment; When the result of the comparison is that the on-state of at least one low-voltage load at the current moment is different from that at the previous moment, it is re-judged whether the current vehicle meets the preset vehicle speed limit condition. 6. The vehicle speed limit method of a vehicle according to claim 1, wherein said judging whether the current vehicle meets a preset vehicle speed limit condition comprises: Judging whether the fault message signal of the DC conversion device and the fault message signal of the battery sensor are received; If the fault message signal of the DC conversion device and the fault message signal of the battery sensor are received, it is determined that the current vehicle satisfies the preset vehicle speed limit condition. 7. The vehicle speed limit method of a vehicle according to claim 1, further comprising: after the current vehicle meets the preset vehicle speed limit condition: Generate speed reduction reminder information based on the preset vehicle speed limit condition; Based on the speed reduction reminder information, the current vehicle is controlled to perform a speed reduction reminder. 8. A vehicle speed limiting device for a vehicle, comprising: The first judging module is used to judge whether the current vehicle satisfies the preset speed limit condition; An acquisition module, configured to acquire the current temperature of the storage battery of the current vehicle, the current power supply voltage of the storage battery, and the on-state of multiple low-voltage loads of the entire vehicle when the current vehicle meets the preset vehicle speed limit condition ;as well as The first speed limiting module is configured to match the optimal discharge curve from multiple preset discharge curves according to the current temperature, the current supply voltage, and the on-states of the multiple low-voltage loads, and according to the optimal The discharge curve calculates the remaining discharge time of the storage battery, and within the remaining discharge time, adjusts the vehicle speed of the current vehicle to a preset minimum safe vehicle speed. 9. A vehicle, characterized in that it comprises: a memory, a processor, and a computer program stored on the memory and operable on the processor, the processor executes the program, so as to realize the The vehicle speed limiting method of any one of 1-7. 10. A computer-readable storage medium, on which a computer program is stored, wherein the program is executed by a processor to implement the vehicle speed limit method for a vehicle according to any one of claims 1-7.