Power management method based on automatic load rejection strategy

Abstract

The invention relates to a power supply management method based on an automatic load rejection strategy. The method comprises the steps of collecting a storage battery terminal voltage as a sampling voltage; when the sampling voltage is smaller than an under-voltage alarm voltage threshold value, under-voltage alarm is carried out, and meanwhile, a power supply of current task equipment is cut off according to a load rejection sequence; judging whether the sampling voltage is smaller than an under-voltage protection voltage threshold value or not; when the sampling voltage is reduced to be smaller than the under-voltage protection voltage threshold value, emergency alarm is carried out, and power supplies of all current task equipment are cut off; after the sampling voltage is smaller than the under-voltage protection voltage threshold for a certain duration, cutting off the power supply of all key equipment; and when the voltage rises to the protection cut-off recovery threshold value, switching on the power supply of the key equipment. Based on a simple voltage judgment method, the automatic load rejection strategy is used for power management, the operation time of passengers is saved, the utilization rate of electric energy is increased, the use condition of a power grid is improved, and safe and reliable operation of the system is further guaranteed.

Description

Technical Field

[0001] The invention relates to a power management control method for armored vehicles, and in particular to a power limiting management method for armored vehicle power supply under special use conditions based on an automatic load dumping strategy. Background Art

[0002] At present, the onboard power supply of armored vehicles is mainly composed of generators and batteries. When the generator is damaged, the battery needs to be used as an uninterruptible power supply to supply power to the electrical equipment in the vehicle. The battery as an emergency power supply is a non-renewable energy source at this time and cannot support the power consumption of the entire vehicle for a long time. Therefore, power management is particularly important at this time. On the one hand, it is necessary to ensure that there is enough energy and time for emergency operation of key loads; on the other hand, it is necessary to retain enough power to maintain the basic operation capability of the vehicle. Summary of the invention

[0003] The purpose of the present invention is to provide a power management method based on an automatic load shedding strategy. When a power failure occurs, power limiting management is achieved through an orderly automatic load shedding management strategy for electrical equipment, leaving sufficient energy and time for the crew's operation and disposal, reducing the impact of concentrated load shedding on the power grid while maintaining the maximum operation of mission equipment as much as possible, thereby ensuring the normal operation of the vehicle.

[0004] The present invention provides a power management method based on an automatic load dumping strategy, characterized in that it comprises the following steps:

[0005] When the sampling voltage is lower than the undervoltage alarm voltage threshold, the load power supply is cut off in the order of load shedding; when the sampling voltage is lower than the undervoltage protection voltage threshold, the power supply of all task loads is cut off; when the sampling voltage is lower than the undervoltage protection voltage threshold and lasts for a certain period of time, the power supply of all critical loads is cut off; when the voltage rises back to the protection cut-off recovery threshold, the power supply of critical loads is connected.

[0006] Furthermore, the method for determining the dumping sequence is as follows:

[0007] First, assign priority Y to the loads according to their importance, then assign power level P to each load in descending order of power, multiply the two together C=Y*P, sort C, and cut off the load with the largest value first. If the results are the same, cut off the load with the lower priority first according to the load priority.

[0008] Furthermore, the electrical loads of armored vehicles are divided into two categories, one is the critical load and the other is the mission load.

[0009] Critical loads are communication devices and computer equipment, and the power supply can be cut off only when the battery voltage drops to the undervoltage protection voltage threshold;

[0010] Mission loads, other electrical equipment except critical loads, are powered according to the load shedding sequence when the battery terminal voltage reaches the undervoltage alarm voltage threshold.

[0011] Furthermore, when the sampled voltage is lower than the undervoltage warning voltage threshold, or when the sampled voltage is lower than the undervoltage protection voltage threshold, an alarm is issued.

[0012] Furthermore, with the help of the bus communication function of the intelligent power distribution module commonly used in armored vehicles, when a power failure occurs, the collected battery terminal voltage is used as the sampling voltage. When the sampled voltages collected continuously for multiple times are all less than the set threshold, the corresponding action is performed.

[0013] Furthermore, an unlocking function is set to stop the power restriction management process at any time, and the occupants can perform manual operations according to the actual situation of the vehicle.

[0014] Beneficial Effects

[0015] 1. The characteristics of this power-limiting management method are that it is judged based on the bus voltage, and it is simple, reliable, and effective in implementation, meeting the power-limiting management needs of armored vehicles;

[0016] 2. Fully consider the crew's usage characteristics. When a power failure occurs, the power supply is limited through the orderly automatic load shedding management strategy of the electrical equipment, leaving enough energy and time for the crew's operation and disposal, reducing the impact of concentrated load shedding on the power grid while maintaining the maximum operation of the mission equipment as much as possible, ensuring the reliable achievement of key tasks of the armored vehicle.

[0017] 3. At the same time, an unlocking function is set to stop the power restriction management strategy at any time to ensure the occupants' right to emergency response.

[0018] 4. This method is the most effective means to solve the problem of battery over-discharge, providing the last barrier for the normal use of the battery and the most basic guarantee for the normal operation of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The present invention is a flow chart of a power management method based on automatic load shedding strategy. DETAILED DESCRIPTION

[0020] The purpose of the present invention is to provide a power management method based on an automatic load dumping strategy. When the generator and secondary power supply of the armored vehicle cannot work normally, the battery will serve as the vehicle's emergency power supply to power the vehicle's electrical equipment. When the battery terminal voltage continues to drop, in order to ensure that the battery still has good starting ability and to ensure that the occupants have enough energy and time for operation and disposal, the present invention designs a power management method based on an automatic load dumping strategy to implement simple and effective power limiting management of the power supply.

[0021] The present invention realizes power limiting management of power supply by setting an orderly automatic load shedding management strategy for power-consuming equipment, reduces the impact of concentrated load shedding on the power grid, and simultaneously maintains the maximum operation of mission equipment as much as possible, thereby ensuring the reliable achievement of key tasks of armored vehicles.

[0022] The present invention collects the battery terminal voltage as the sampling voltage; determines whether the consecutive sampling voltage is less than or equal to the undervoltage alarm voltage threshold; when the consecutive sampling voltage is less than or equal to the undervoltage alarm voltage threshold, an undervoltage warning is given by means of a light alarm, and at the same time, the power supply of the current task equipment is cut off in the order of load shedding; if the consecutive sampling voltage is greater than the undervoltage alarm value, the power supply of the task equipment is stopped from being cut off; when the consecutive sampling voltage drops to less than the undervoltage protection voltage threshold, an emergency alarm is given in the form of an intermittent buzzer alarm, and at the same time, the power supply of all current task equipment is cut off; when the consecutive sampling voltage rises back to above the undervoltage protection voltage threshold, the emergency alarm is still given in the form of an intermittent buzzer alarm; when the sampling voltage is less than the undervoltage protection voltage threshold for a certain duration, the power supply of the key equipment is cut off.

[0023] The following is a detailed description of the steps:

[0024] When the power fails,

[0025] (1) The battery terminal voltage is collected once every 100 ms as the sampling voltage.

[0026] (2) Compare the sampled voltage with the undervoltage alarm threshold to determine whether the sampled voltages for five consecutive times are all less than or equal to the undervoltage alarm voltage U1;

[0027] When the sampling voltage is greater than or equal to the warning threshold U1 or the sampling voltage is less than the warning threshold for less than 5 consecutive times, the sampling is repeated;

[0028] When the sampling voltage is less than the warning threshold U1 for 5 consecutive times, an undervoltage warning is issued, the corresponding warning light flashes, and the power supply of the current task equipment is cut off in the order of load shedding;

[0029] The order of load shedding depends not only on the importance of the load, but also on the power level. First, assign a priority Y (1, 2, 3...) to the load according to its importance, and then assign a power level P (1, 2, 3...) to each load in order from large to small power. Multiply the two, C = Y*P, sort C, and cut off the load with the largest value first. If the results are the same, cut off the load with the lower priority first according to the load priority. For example, Table 1 below.

[0030] Table 1 List of load dumping sequences

[0031]

[0032]

[0033] Sampling is performed again. When the sampling voltage is greater than the warning threshold U1 for three consecutive times, the undervoltage warning is stopped. Otherwise, the undervoltage warning is continued and the power supply of the task equipment is cut off in sequence.

[0034] (3) The voltage continues to drop, and the sampled voltage is compared with the undervoltage protection threshold to determine whether it is less than the undervoltage protection threshold U2;

[0035] When the sampling voltage drops below the undervoltage protection voltage U2 for three consecutive times, the undervoltage protection program is entered, the alarm light flashes and the buzzer sounds intermittently to give an emergency alarm, and the power supply of all current task loads is cut off at the same time;

[0036] There are two types of electrical equipment in armored vehicles: one is critical load and the other is mission load.

[0037] Key loads are communication devices and computer equipment. The power supply can only be cut off when the battery voltage drops to the undervoltage protection threshold.

[0038] Mission load, other electrical equipment except critical load.

[0039] (4) At the same time, the sampled voltage is still compared with the undervoltage protection threshold. When the sampled voltage is less than the undervoltage protection voltage U2 for a certain duration T1, the power supply of the critical load is cut off, wherein T1 can be set according to the actual situation;

[0040] (5) When the voltage rises again, the sampled voltage is compared with the protection cut-off recovery threshold to determine whether it is greater than or equal to the protection cut-off recovery threshold U3;

[0041] When the sampling voltage is greater than or equal to U3 for five consecutive times, the protection cut-off recovery program is entered and the power supply of key equipment is turned on.

[0042] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A power management method based on automatic load dumping strategy, characterized in that: When the sampling voltage is lower than the undervoltage alarm voltage threshold, the load power supply is cut off in the order of load shedding; when the sampling voltage is lower than the undervoltage protection voltage threshold, the power supply of all task loads is cut off; when the sampling voltage is lower than the undervoltage protection voltage threshold and lasts for a certain period of time, the power supply of all critical loads is cut off; when the sampling voltage rises back to the protection cut-off recovery threshold, the power supply of critical loads is connected.

2. A power management method based on automatic load shedding strategy according to claim 1, characterized in that: The method for determining the dumping sequence is as follows: First, assign priority Y to the loads according to their importance, then assign power level P to each load in descending order of power, multiply the two together C=Y*P, sort C, and cut off the load with the largest value first. If the results are the same, cut off the load with the lower priority first according to the load priority.

3. A power management method based on automatic load shedding strategy according to claim 1, characterized in that: The electrical loads of armored vehicles are divided into two categories: one is the critical load and the other is the mission load. Critical loads include communication devices and computer equipment; Mission load, other electrical equipment except critical load.

4. A power management method based on automatic load shedding strategy according to claim 1, characterized in that: When the sampled voltage is lower than the undervoltage warning voltage threshold, or when the sampled voltage is lower than the undervoltage protection voltage threshold, an alarm is issued.

5. A power management method based on an automatic load shedding strategy according to any one of claims 1 to 4, characterized in that: With the help of the bus communication function of the intelligent power distribution module commonly used in armored vehicles, when the power supply fails, the collected battery terminal voltage is used as the sampling voltage. When the sampled voltages collected continuously for multiple times are all lower than the set threshold, the corresponding action is performed.

6. The power management method based on automatic load shedding strategy according to claim 5, characterized in that: An unlocking function is set to stop the power restriction management process at any time, and passengers can perform manual operations according to the actual situation of the vehicle.

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