A new energy automobile power management system and a control strategy thereof

Abstract

The application provides a new energy automobile power management system and a control strategy thereof, wherein the system comprises: a storage battery power sensor, which is electrically connected with a battery energy control unit, is used for detecting the power of the storage battery in real time, and sends a power signal to the battery energy control unit; the battery energy control unit sets a battery energy level according to the vehicle power state, the working state of a DCDC converter and the power signal, controls the vehicle power according to the battery energy level, and starts intelligent power compensation when the power of the storage battery is low; if the intelligent power compensation fails and the power is further reduced, the driver is reminded, and the storage battery is turned off if the power is further reduced after the reminder. The application can remind the driver and turn off the storage battery when the power of the storage battery is low, so that the power of the storage battery can be prevented from being excessively consumed, and the situation that the vehicle cannot be normally started due to the depletion of the power of the storage battery can be avoided.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of vehicle power management, and particularly relates to a new energy automobile power management system and a control strategy thereof. BACKGROUND

[0002] The low-voltage electrical load of a new energy automobile mainly relies on a DCDC converter to convert high-voltage electricity of a power battery into 12V power supply for power supply. However, when the vehicle is not in a READY state and the power of the power battery is too low, in order to ensure the performance and endurance of the power battery, the DCDC converter is closed, at this time, the air conditioner, entertainment and other systems of the automobile are continuously powered by the low-voltage storage battery on the vehicle, thereby easily leading to excessive consumption of the power of the storage battery, and further affecting the vehicle to start again. Therefore, designing a new energy automobile power management system and a control strategy thereof to manage the power supply and avoid excessive consumption of the power of the storage battery has become a technical problem that a person skilled in the art urgently needs to solve. SUMMARY

[0003] The application aims to provide a new energy automobile power management system to solve the above technical problems in the prior art. Another object of the application is to provide a new energy automobile power management system control strategy.

[0004] To achieve the above object, the application provides the following technical scheme.

[0005] A new energy automobile power management system comprises:

[0006] A storage battery power sensor is electrically connected with a battery energy control unit, used for detecting the power of the storage battery in real time and sending a power signal to the battery energy control unit;

[0007] The battery energy control unit sets a battery energy level according to the vehicle power state, the working state of the DCDC converter and the power signal, controls the vehicle power supply according to the battery energy level, and reminds the driver when the power of the storage battery is low.

[0008] A new energy automobile power management system control strategy comprises:

[0009] When the vehicle power state is OFF or READY, the battery energy control unit sets the battery energy level to Level 0, and does not limit the vehicle load;

[0010] When the vehicle power state is IGN and the DCDC converter is turned on, the battery energy control unit sets the battery energy level to Level 0, and does not limit the vehicle load;

[0011] When the vehicle power supply state is IGN, the DCDC converter is off, and the battery power is ≥45%, the battery energy level is set to Level 0, and no limitation is imposed on the vehicle load;

[0012] When the vehicle power supply state is IGN, the DCDC converter is off, and the battery power is <45%, the battery energy level is set to Level 1, and the driver is reminded of the low battery power;

[0013] When the battery energy level is Level 1 for a certain period of time, and the vehicle power supply state is not switched to OFF or READY state through the ignition switch, the battery energy control unit sets the battery energy level to Level 2 and directly switches the vehicle power supply state to OFF state;

[0014] When the battery energy level is Level 2, and the battery power sensor detects that the battery power is ≤35%, the battery energy control unit controls the power battery to supply high voltage to the vehicle, if the high voltage system is not faulty and the power battery power is sufficient (≥10%), i.e., the intelligent power compensation condition is met, the power battery and the DCDC converter are used to supply power to the electrical load on the vehicle, and the power battery is used to charge the battery through the DCDC converter; if the high voltage system is faulty or the power battery power is <10%, i.e., the intelligent power compensation condition is not met, the battery energy control unit sends a low power signal to remind the driver of the low battery power; if the battery energy control unit sends the low power signal and detects that the battery power decreases to 30%, the battery energy control unit controls the battery to be powered off and no longer supply power to the outside.

[0015] Preferably, the way to remind the driver of the low battery power is voice broadcast reminder.

[0016] Preferably, the way to remind the driver of the low battery power is instrument reminder and voice broadcast reminder.

[0017] Preferably, the instrument reminder is to display reminder text on the instrument panel in the vehicle.

[0018] Preferably, the voice broadcast reminder is voice reminder through the speaker of the vehicle-mounted MP5.

[0019] Preferably, the certain period of time is 13-18 seconds.

[0020] Preferably, the certain period of time is 15 seconds.

[0021] Preferably, the method for reminding the driver of the low battery level is that the vehicle-mounted T-Box acquires the low battery level signal through the CAN bus of the vehicle, the vehicle-mounted T-Box transmits the reminder information to the mobile network operator SMS platform through the mobile network signal, and the mobile network operator SMS platform sends a short message to the driver's mobile phone for text reminder.

[0022] Preferably, the battery energy control unit corrects the battery level at the boundary between Level 0 and Level 1 and when reminding the driver of the low battery level according to the accuracy of the battery level sensor.

[0023] The present application has the following beneficial effects:

[0024] The new energy vehicle power management system of the present application can control the vehicle power supply according to the battery energy level, remind the driver when the battery level is low, and has the functions of intelligent power compensation and battery shutdown, thereby avoiding excessive consumption of the battery level and preventing the vehicle from being unable to start normally due to the depletion of the battery level.

[0025] The control strategy of the new energy vehicle power management system of the present application also has the above beneficial effects. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced, and the specific embodiments of the present application will be further described in detail with reference to the drawings, in which

[0027] Figure 1 The architecture diagram of the new energy vehicle power management system provided by the embodiments of the present application. DETAILED DESCRIPTION

[0028] In order to make those skilled in the art better understand the technical solutions of the present application, the present application will be further described in detail with reference to the specific embodiments.

[0029] The embodiments of the present application provide a new energy vehicle power management system, which comprises:

[0030] The battery level sensor is electrically connected with the battery energy control unit, and is used for detecting the battery level in real time and sending the battery level signal to the battery energy control unit.

[0031] The battery energy control unit sets the battery energy level according to the vehicle power supply state, the working state of the DCDC converter and the power signal, controls the vehicle power supply according to the battery energy level, starts intelligent power compensation when the power of the storage battery decreases to a certain value, charges the storage battery, reminds the driver when the power of the storage battery further decreases to a certain value if the intelligent power compensation fails, and closes the storage battery and stops external power supply when the power of the storage battery further decreases to another certain value after the reminder.

[0032] The new energy automobile power management system provided by the embodiment can control the vehicle power supply according to the battery energy level, remind the driver when the power of the storage battery is low, and has the functions of intelligent power compensation and storage battery closing, so that the power of the storage battery can be prevented from being excessively consumed, and the situation that the vehicle cannot be normally started due to the depletion of the power of the storage battery can be avoided.

[0033] The embodiment further provides a new energy automobile power management system control strategy, which comprises that the battery energy control unit divides the battery energy level as follows:

[0034] When the vehicle power supply state is OFF or READY, the battery energy control unit sets the battery energy level as Level 0, and does not limit the electrical load on the vehicle;

[0035] When the vehicle power supply state is IGN and the DCDC converter is started, the battery energy control unit sets the battery energy level as Level 0, and does not limit the electrical load on the vehicle;

[0036] When the vehicle power supply state is IGN, the DCDC converter is closed and the power of the storage battery is greater than or equal to 45%, the battery energy level is set as Level 0, and the electrical load on the vehicle is not limited;

[0037] When the vehicle power supply state is IGN, the DCDC converter is closed and the power of the storage battery is less than 45%, the battery energy level is set as Level 1, and the driver is reminded of the insufficient power of the storage battery (at this time, the electrical load on the vehicle is not limited, only the driver is prompted that the power of the storage battery is insufficient, the driver needs to power off the electrical load that is not necessarily used, or switch the vehicle power supply state to READY, so as to ensure that the electrical load such as air conditioner and vehicle MP5 can continue to be used);

[0038] When the battery energy level is Level 1 for a certain time, and the vehicle power state is not switched to OFF or READY state through the ignition switch, the battery energy control unit sets the battery energy level to Level 2, and directly switches the vehicle power state to OFF state (at this time, since the vehicle power state is OFF state, the electrical loads on the vehicle are limited, so that most of the electrical loads on the vehicle such as air conditioning, vehicle MP5, etc. cannot be used);

[0039] When the battery energy level is Level 2, and the storage battery power sensor detects that the power of the storage battery is ≤35%, the battery energy control unit controls the power battery to supply high voltage to the vehicle, if the high voltage system has no fault, the power of the power battery is sufficient, i.e. ≥10%, i.e. the intelligent power compensation condition is met, then the power battery and the DCDC converter are used to supply power to the electrical loads on the vehicle, and the power battery is used to charge the storage battery through the DCDC converter; if the high voltage system has a fault, or the power of the power battery is <10%, i.e. the intelligent power compensation condition is not met, then the battery energy control unit will send a low power signal to remind the driver that the power of the storage battery is low; if the battery energy control unit sends a low power signal and detects that the power of the storage battery decreases to 30%, then the battery energy control unit controls the storage battery to be powered off and no longer supply power to the outside.

[0040] It can be understood that although the battery energy level is Level 2, the vehicle power state is switched to OFF state, and many electrical modules on the vehicle will not work, but many controllers on the vehicle are connected to the storage battery, and have static current consumption, so that the power of the storage battery will continue to decrease at this time.

[0041] In an embodiment, the way to remind the driver that the power of the storage battery is low is voice broadcast reminder.

[0042] In another embodiment, the way to remind the driver that the power of the storage battery is low is instrument reminder and voice broadcast reminder, so that the driver can get double reminders, and better reminding effect is achieved.

[0043] Specifically, the instrument reminder is to display a reminder text on the instrument panel in the vehicle, and the reminder text can be preferably displayed as "the power of the storage battery is low, the vehicle will be powered off".

[0044] Specifically, the voice broadcast reminder is to remind through the speaker of the vehicle MP5, and the reminder voice can be preferably "the power of the storage battery is low, the vehicle will be powered off".

[0045] Further, the certain time is 13-18 seconds.

[0046] Preferably, the certain time is 15 seconds.

[0047] Further, the method for reminding the driver of the low battery level is that the vehicle T-Box obtains the low battery level signal through the CAN bus of the vehicle, the vehicle T-Box transmits the reminder information to the mobile network operator SMS platform through the mobile network signal, and the mobile network operator SMS platform sends a short message to the driver's mobile phone for text reminder. By sending a short message to the driver's mobile phone, the driver is reminded to charge in time. Preferably, the content of the short message is "low battery level, the vehicle is at risk of power loss, please charge in time".

[0048] Specifically, the battery energy control unit corrects the battery level at the boundary between Level 0 and Level 1 and the battery level at which the driver is reminded of the low battery level according to the accuracy of the battery level sensor. Specifically, when the accuracy of the battery level sensor IBS is ≥5%, the battery level at the boundary between Level 0 and Level 1 is 45%; when the accuracy of the battery level sensor is <5%, the battery level at the boundary between Level 0 and Level 1 is set to 40%, i.e., when the vehicle power state is IGN state, the DCDC converter is turned off, and the battery level is ≥40%, the battery energy level is set to Level 0; when the vehicle power state is IGN state, the DCDC converter is turned off, and the battery level is <40%, the battery energy level is set to Level 1; when the accuracy of the battery level sensor is ≥5%, when the battery energy level is Level 2, and the battery level sensor detects that the battery level is ≤35%, the battery energy control unit controls the power battery to supply high voltage to the vehicle; if the battery energy control unit detects that the battery level has decreased to 30% after sending the low battery level signal, the battery energy control unit controls the battery to be powered off and no longer supply power externally; when the accuracy of the battery level sensor is <5%, when the battery energy level is Level 2, and the battery level sensor detects that the battery level is ≤30%, the battery energy control unit controls the power battery to supply high voltage to the vehicle; if the battery energy control unit detects that the battery level has decreased to 25% after sending the low battery level signal, the battery energy control unit controls the battery to be powered off and no longer supply power externally. The battery energy level is shown in Table 1.

[0049] Table 1 Battery energy level

[0050]

[0051] It should be noted that the state of the ignition switch and the vehicle power state can be obtained from the display screen on the combination instrument of the vehicle. As shown in Table 2, the vehicle power state is consistent with the vehicle power state commonly used in the prior art.

[0052] Table 2: Description of vehicle power state

[0053]

[0054] When the vehicle power state is IGN state, DCDC converter is off and the battery power is < 45%, the condition here is that the DCDC converter is off, the reason for the DCDC converter to be off is that the power battery power is insufficient, the whole vehicle is not allowed to be high voltage, so the DCDC converter is off; but at this time it is still allowed to switch to READY state, because at this time the vehicle needs to enter the READY state to ensure that the vehicle travels to the charging pile for charging. It should be noted that in IGN and READY states, the whole vehicle can be high voltage, but the threshold for judging whether the power battery power can be high voltage is different. In IGN mode, the threshold is relatively high, because the vehicle cannot run in IGN, the vehicle stops, and the use scenario is that the user rests and entertains in the vehicle. Therefore, the threshold for judging the power battery is relatively high, which is to ensure that the power battery has a certain amount of power, and the minimum can ensure that the vehicle travels to the charging pile for charging. In READY state, the high voltage is to ensure that the vehicle can run, so the threshold of the power battery at this time is set to be relatively low.

[0055] When the vehicle state is OFF state, the functions of the whole vehicle except the electric seat, position light and danger warning light can be turned on, and other functions cannot be used. For details, see Table 3, wherein “X” indicates that the function cannot be used, and “√” indicates that the function can be used.

[0056] Table 3: Function state of each module under each vehicle power state

[0057]

[0058]

[0059] The high voltage on the vehicle is that: the main positive and main negative relays inside the whole vehicle power battery are closed, and after being closed, it is equivalent to connecting the DC high voltage power supply of all high voltage modules (DCDC converter, vehicle charger, i.e. OBC, driving motor, etc., high pressure compressor), and at the same time, the controllers of these high voltage modules are in the wake-up state. There are three methods for high voltage, one is that the driver enters the vehicle into the IGN state or READY state by operating the ignition switch; two is that when charging, the battery energy control unit detects that the charging gun is inserted, and automatically requests the power battery to close the main positive and main negative relays to complete the high voltage operation; three is remote operation, such as remote intelligent power compensation, remote start of air conditioner, the battery energy control unit detects the remote intelligent power compensation and remote start of air conditioner command sent by the T-Box (the compressor of the new energy vehicle is a high pressure compressor, so the remote start of air conditioner needs high voltage), and automatically requests the power battery to close the main positive and main negative relays to complete the high voltage operation. The whole vehicle high voltage is irrelevant to whether the vehicle power state is OFF, IGN or READY, as long as the conditions are met, the high voltage can be turned on in any power state. The battery energy control unit can be integrated in the vehicle body controller.

[0060] The application makes the vehicle still be able to use the storage battery to ensure that the driver uses the air conditioner, audio and other electrical appliances for a period of time when the DCDC stops working due to low power of the power battery, and can automatically switch the vehicle power state to the OFF state when the power of the storage battery is low, so that the whole vehicle power consumption is greatly reduced, and it is ensured that the vehicle cannot be started next time due to the low power of the storage battery; at the same time, in order to ensure that the storage battery has a safe remaining power, the driver is reminded by the instrument and voice broadcast, and the reason is informed; and the storage battery can be intelligently compensated when the power of the storage battery is low, if the intelligent compensation condition is not met, the battery energy control unit will send a low power signal to remind the driver that the power of the storage battery is low, and if the battery energy control unit sends a low power signal, and the power of the storage battery is still decreasing and decreases to 30%, the battery energy control unit controls the storage battery to be powered off and no longer supplies power to the outside.

[0061] The vehicle in the application mainly formulates different battery energy levels through the battery power and the working state of the DCDC converter when the vehicle is in a non-READY state, so as to ensure that the load is not limited when the power is sufficient; when the power is low, the driver is informed of the vehicle state through text and voice prompt, and after reminding the driver, if the driver does not process the current prompt and actively powers off, it is ensured that the storage battery has a safe remaining power and the vehicle can be normally started next time; when the vehicle is parked for a long time without being used, the storage battery power sensor monitors the power of the storage battery in real time, and sends a message to the driver's mobile phone to remind the driver when the power of the storage battery is very low.

[0062] The above merely preferred embodiments of the present application, it should be noted that these examples are only used to illustrate the present application and not for limiting the scope of the present application, and, after reading the content of the present application, the relevant technical personnel in the art can make various changes or modifications to the present application, these equivalent forms also fall within the scope of the appended claims of the present application.

Claims

1. A new energy vehicle power management system control strategy, characterized in that, It comprises: When the vehicle power state is OFF or READY state, the battery energy control unit sets the battery energy level to Level 0, and does not limit the vehicle load; When the vehicle power state is IGN state, and the DCDC converter is on, the battery energy control unit sets the battery energy level to Level 0, and does not limit the vehicle load; When the vehicle power state is IGN state, the DCDC converter is off, and the battery power is ≥45%, the battery energy level is set to Level 0, and the vehicle load is not limited; When the vehicle power state is IGN state, the DCDC converter is off, and the battery power is <45%, the battery energy level is set to Level 1, and the driver is reminded of the low battery power; When the battery energy level is Level 1 for a certain period of time, and the vehicle power state is not switched to OFF or READY state through the ignition switch, the battery energy control unit sets the battery energy level to Level 2, and directly switches the vehicle power state to OFF state; When the battery energy level is Level 2, and the battery power sensor detects that the battery power is ≤35%, the battery energy control unit controls the power battery to supply power to the high voltage on the vehicle. If the high voltage system has no fault, the power battery power is sufficient, i.e. ≥10%, i.e. the intelligent power compensation condition is met, the power battery and the DCDC converter are used to supply power to the electrical load on the vehicle, and the power battery is charged through the DCDC converter. If the high voltage system has a fault, or the power battery power is <10%, i.e. the intelligent power compensation condition is not met, the battery energy control unit sends a low power signal to remind the driver of the low battery power. If the battery energy control unit sends a low power signal and detects that the battery power decreases to 30%, the battery energy control unit controls the battery to be powered off and no longer supply power externally; The battery energy control unit corrects the battery power at the boundary between Level 0 and Level 1 and when reminding the driver of the low battery power according to the accuracy of the battery power sensor. Specifically, when the accuracy of the battery power sensor IBS is ≥5%, the battery power at the boundary between Level 0 and Level 1 is 45%. When the accuracy of the battery power sensor is <5%, the battery power at the boundary between Level 0 and Level 1 is set to 40%, i.e. when the vehicle power state is IGN state, the DCDC converter is off, and the battery power is ≥40%, the battery energy level is set to Level 0; when the vehicle power state is IGN state, the DCDC converter is off, and the battery power is <40%, the battery energy level is set to Level 1. When the accuracy of the battery power sensor is ≥ 5%, the battery energy control unit controls the high voltage of the vehicle when the battery energy level is Level 2 and the battery power sensor detects that the battery power is ≤ 35%, and the battery energy control unit controls the power-off of the battery and stops supplying power to the outside when the battery energy control unit sends a low power signal and detects that the battery power is reduced to 30%; when the accuracy of the battery power sensor is < 5%, the battery energy control unit controls the high voltage of the vehicle when the battery energy level is Level 2 and the battery power sensor detects that the battery power is ≤ 30%, and the battery energy control unit controls the power-off of the battery and stops supplying power to the outside when the battery energy control unit sends a low power signal and detects that the battery power is reduced to 25%.

2. The control strategy of the new energy vehicle power management system according to claim 1, characterized in that, The method for reminding the driver of the low battery power is voice broadcast reminding.

3. The control strategy of the new energy vehicle power management system according to claim 1, characterized in that, The method for reminding the driver of the low battery power is instrument reminding and voice broadcast reminding.

4. The control strategy of the new energy vehicle power management system according to claim 3, characterized in that, The instrument reminding is displaying reminding text on the instrument panel in the vehicle.

5. The control strategy of the new energy vehicle power management system according to claim 3, characterized in that, The voice broadcast reminding is voice reminding through the speaker of the vehicle MP5.

6. The control strategy of the new energy vehicle power management system according to claim 1, characterized in that, The certain time is 13-18 seconds.

7. The control strategy of the new energy vehicle power management system according to claim 6, characterized in that, The certain time is 15 seconds.

8. The control strategy of the new energy vehicle power management system according to claim 1, characterized in that, The method for reminding the driver of the low battery power is that the vehicle T-Box obtains the low power signal through the CAN bus of the vehicle, the vehicle T-Box transmits the reminding information to the mobile network operator SMS platform through the mobile network signal, and the mobile network operator SMS platform sends a text message to the driver's mobile phone for text reminding.

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