CN113949117B - A remote sensing satellite battery autonomous undervoltage protection method - Google Patents

Abstract

An autonomous under-voltage protection method for a remote sensing satellite storage battery comprises the following steps: step S1: acquiring voltage telemetry data of the storage battery and transmitting the voltage telemetry data to a spaceborne computer; step S2: the satellite-borne computer judges whether the remote measurement data of the storage battery voltage is credible or not; step S3: the satellite-borne computer compares the storage battery voltage in the credible storage battery voltage telemetry data with an undervoltage protection threshold V _m, and if the storage battery voltage is lower than V _m within the preset abnormal duration, the storage battery is judged to have an undervoltage; step S4: performing battery under-voltage protection, including one or more of: executing a load safety shutdown program control sequence, disconnecting a satellite part power distribution channel, canceling a load task, adjusting a heating loop temperature control threshold value, and disconnecting a heating loop; step S5: the satellite-borne computer sends the under-voltage state of the storage battery to the control subsystem, and the control subsystem enables the solar cell array to finish sun orientation, so that the charging of the storage battery is ensured.

Description

A remote sensing satellite battery autonomous undervoltage protection method

Technical Field

The invention relates to an autonomous undervoltage protection method for a remote sensing satellite battery, and relates to the technical field of on-orbit management of remote sensing satellite batteries.

Background Art

The power supply system of remote sensing satellite usually adopts the power supply scheme of solar array-battery system and adjustable DC bus system. During the service life, the power supply system provides uninterrupted power to the satellite subsystem loads. During the illumination period, the solar array completes the source collection, converts solar energy into electrical energy, supplies power to the load and charges the battery. During the shadow period, the battery supplies power to the bus through the discharge regulator or when the load power exceeds the power supply capacity of the solar array during the illumination period, the battery provides additional power.

Therefore, batteries, as the main energy storage device of remote sensing satellites, are an important part of the power supply system of remote sensing satellites. In the early design of remote sensing satellites, nickel-cadmium batteries (Ni-Cd) were usually used. With the development of remote sensing satellites, nickel-cadmium batteries cannot adapt to the weight requirements under higher load ratios and higher power densities. Currently, more and more remote sensing satellites are equipped with lithium-ion batteries (Li-ion) with higher energy-to-weight ratio and energy-to-volume ratio as space energy storage components. The life of the battery directly determines the working life of the power supply system, which in turn affects the high reliability and long-life operation of remote sensing satellites in orbit.

Although lithium-ion battery packs have the advantages of small size, light weight, and large storage capacity, they also face the disadvantage of failure under certain conditions, including overcharging or over-discharging, which will cause irreversible damage. Therefore, when using lithium-ion batteries, it is necessary to strictly control overcharging or over-discharging. More and more remote sensing satellites are designed with the ability to autonomously manage lithium-ion batteries on orbit, including battery overcharge protection, battery over-discharge protection, battery charging curve switching, battery balancing management, etc.

The current autonomous undervoltage protection method for lithium-ion batteries used by remote sensing satellites is to set the satellite to autonomously enter the minimum energy mode, reduce the satellite load, reduce battery energy consumption, and extend its working time. However, this method has the following defects: it does not take into account other satellite faults, such as abnormal attitude and orbit errors, which lead to abnormal solar array tracking of the sun, the battery is not charged in time, and the state of charge continues to decrease, resulting in undervoltage. At present, no autonomous protection strategy has been adopted to protect the battery from undervoltage in response to the above fault conditions.

Summary of the invention

The technical problem to be solved by the present invention is: to overcome the shortcomings of the prior art and provide an autonomous undervoltage protection method for a remote sensing satellite battery, comprising the following steps: step S1: obtaining battery voltage telemetry data and transmitting it to a satellite-borne computer; step S2: the satellite-borne computer determines whether the battery voltage telemetry data is credible; step S3: the satellite-borne computer compares the battery voltage in the credible battery voltage telemetry data with an undervoltage protection threshold value V _m , and if the battery voltage is lower than V _m within a preset abnormal duration, it is determined that the battery is undervoltage; step S4: executing battery undervoltage protection, including one or more of the following operations: executing a payload safety shutdown program control sequence, disconnecting a satellite power distribution path, canceling a payload task, adjusting a heating circuit temperature control threshold value, and disconnecting a heating circuit; step S5: the satellite-borne computer sends the battery undervoltage state to a control subsystem, and the control subsystem enables a solar array to complete sun orientation to ensure the charging of the battery.

The purpose of the present invention is achieved through the following technical solutions:

A remote sensing satellite battery autonomous undervoltage protection method comprises the following steps:

Step S1: Obtaining battery voltage telemetry data through a sensor or telemetry acquisition circuit, and transmitting it to the onboard computer;

Step S2: The onboard computer determines whether the battery voltage telemetry data is credible based on one or more factors including the sensor working state, the acquisition circuit state, and the data exchange bus communication state;

Step S3: The onboard computer compares the battery voltage in the reliable battery voltage telemetry data with the undervoltage protection threshold V _m . If the battery voltage is lower than V _m within the preset abnormal duration, it is determined that the battery is undervoltage, and the process goes to step S4.

Step S4: Execute battery undervoltage protection, including one or more of the following operations: execute the payload safety shutdown program sequence, disconnect the satellite power distribution path, cancel the payload task, adjust the heating circuit temperature control threshold, and disconnect the heating circuit;

Step S5: The onboard computer sends the battery undervoltage status to the control subsystem, and the control subsystem enables the solar array to complete the sun orientation to ensure the charging of the battery.

In one embodiment of the present invention, the onboard computer determines whether the battery voltage telemetry data is credible, which can avoid misjudgment of the battery voltage telemetry data due to one or more factors including the influence of the satellite operating space environment, reduced circuit reliability, component performance degradation, abnormal operation of the intelligent unit software, and bit errors in the data transmission link.

In one embodiment of the present invention, when the battery voltage telemetry data includes multiple measurement results, a two-out-of-three or weighted coefficient assignment method is used to determine whether the battery is under-voltage.

In one embodiment of the present invention, in step S4, an enabling control is provided for allowing or prohibiting the execution of battery undervoltage protection.

In one embodiment of the present invention, in step S5, the control subsystem is provided with an enabling control for allowing or prohibiting the solar array from being oriented toward the sun.

In one embodiment of the present invention, after step S5, the following steps are further included:

Step S6: The onboard computer obtains the current orbital position of the satellite and determines whether the satellite is currently in the transition from the illumination period to the earth shadow period;

Step S7: If the satellite is currently in the transition from the illumination period to the Earth's shadow period, the onboard computer obtains a reliable battery voltage and compares it with the battery full charge voltage threshold _Vc . If the reliable battery voltage is lower than _Vc within a preset duration, it is determined that the battery is not fully charged in the current cycle.

A remote sensing satellite battery autonomous undervoltage protection method comprises the following steps:

Step S10: Obtaining battery voltage telemetry data through a sensor or telemetry acquisition circuit, and transmitting it to the onboard computer;

Step S20: The onboard computer determines whether the battery voltage telemetry data is credible based on one or more factors of the sensor working state, the acquisition circuit state, and the data exchange bus communication state;

Step S30: Battery low voltage warning judgment: The onboard computer compares the credible battery voltage with the warning threshold _Vw . If the battery voltage is lower than the threshold _Vw within the preset abnormal duration, it is determined that a low voltage warning has occurred, and the process goes to step S40 to execute the battery low voltage warning protection.

Battery undervoltage judgment: The onboard computer compares the battery voltage in the reliable battery voltage telemetry data with the undervoltage protection threshold V _m . If the battery voltage is lower than V _m within the preset abnormal duration, it is determined that the battery is undervoltage, and the process goes to step S40 to execute battery undervoltage protection.

Step S40: Execute battery low voltage warning protection, including one or more of the following operations: switch the charging control curve, set the low voltage warning handling operation to be disabled;

Execute battery undervoltage protection, including one or more of the following operations: execute the payload safety shutdown program sequence, disconnect the satellite power distribution path, cancel the payload task, adjust the heating circuit temperature control threshold, and disconnect the heating circuit;

Step S50: The onboard computer sends the battery undervoltage status to the control subsystem, and the control subsystem enables the solar array to complete the sun orientation to ensure the charging of the battery.

In one embodiment of the present invention, in step S40, a battery undervoltage protection enable control is provided to allow or prohibit the execution of battery undervoltage protection; a battery low voltage warning disposal enable control is provided to allow or prohibit the execution of battery low voltage warning disposal.

In one embodiment of the present invention, the onboard computer determines the low-voltage warning of the battery, which can avoid abnormal battery charging control and failure to charge the battery according to the designed control strategy.

In one embodiment of the present invention, after step S50, the following steps are further included:

Step S60: The onboard computer obtains the current orbital position of the satellite and determines whether the satellite is currently in the transition from the illumination period to the earth shadow period;

Step S70: If the satellite is currently in the transition from the illumination period to the Earth's shadow period, the onboard computer obtains a reliable battery voltage and compares it with the battery full charge voltage threshold _Vc . If the reliable battery voltage is lower than _Vc within a preset duration, it is determined that the battery is not fully charged in the current cycle.

Compared with the prior art, the present invention has the following beneficial effects:

(1) The present invention ensures the credibility of the telemetry data and avoids unexpected protection actions caused by telemetry data errors by making multi-faceted judgments on the collected battery voltage telemetry data, including the integrated judgment of the acquisition circuit status, data processing link and data interaction status.

(2) The present invention ensures the reliability of the battery undervoltage judgment result by jointly interpreting the judgment results of multiple battery voltages, thereby avoiding the occurrence of unexpected protection actions caused by abnormal operation or logical errors of the onboard computer.

(3) When the battery is over-discharged, the method of the present invention performs satellite attitude maneuvers while performing satellite safety protection, so that the solar array can complete the sun tracking in time, which can ensure the charging of the battery and the power supply to the satellite, prevent further discharge from causing damage to the battery, improve satellite reliability and extend the battery life.

(4) The method of the present invention implements hierarchical battery undervoltage protection by executing different levels of protection actions according to different degrees of low voltage of the battery, thereby improving the refinement of satellite autonomous management.

(5) The method of the present invention determines the battery charging status of each circle by judging the battery voltage when the satellite changes from light to shadow in each circle, and generates an event report to warn the ground when the battery is not fully charged, thereby ensuring that the ground can identify the non-full charge state of the battery in advance.

(6) The method of the present invention is flexible to use. The voltage threshold, disposal strategy and disposal mark involved therein can be modified by annotation. It is universal and compatible and can meet the undervoltage protection requirements of batteries of different types of spacecraft.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a flow chart of the method of the present invention.

FIG. 2 is a flow chart of a first embodiment of the method of the present invention.

FIG3 is a schematic diagram of the content and format of a telemetry source packet in the present invention.

FIG4 is a flow chart of a second embodiment of the method of the present invention.

DETAILED DESCRIPTION

In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

A remote sensing satellite lithium-ion battery autonomous undervoltage protection method, that is, a remote sensing satellite battery autonomous undervoltage protection method, comprising the following steps:

Step S1: Acquisition of battery voltage telemetry information: Acquisition and processing of one or more battery voltage telemetry information is performed through one or more sensors or telemetry acquisition circuits, and transmission to the onboard computer via a data exchange bus;

Step S2: judging the credibility of battery voltage telemetry: judging the validity of battery voltage telemetry to determine whether the battery voltage obtained in step S1 is credible, and the judging method includes analyzing the working state of the sensor, the state of the acquisition circuit, the communication state of the data exchange bus, or the analysis of the integration of these aspects;

Step S3: Battery undervoltage judgment: The onboard computer compares the credible battery voltage with the undervoltage protection threshold V _m . If the battery voltage is lower than V _m within the preset abnormal duration, it is determined that the battery is undervoltage.

Step S4: Battery undervoltage protection operation: After the judgment in step S3, if the battery is undervoltage, the battery undervoltage protection is performed when the handling operation is "allowed" and the preset protection operation sequence is executed. The event report is generated and broadcasted to the ground through the downlink channel;

Step S5: The onboard computer sends the battery undervoltage status to the control subsystem via the data exchange bus, and the control subsystem completes the solar orientation to ensure the charging of the battery;

Step S6: Determine the orbital position of the satellite: the onboard computer obtains the current orbital position of the satellite and determines whether the satellite is currently in the transition from the illumination period to the earth shadow period;

Step S7: Battery charging cycle not fully charged warning: After the judgment in step S6, if the satellite is currently in the transition from the illumination period to the Earth shadow period, then when the charging not fully charged warning operation is "allowed", the onboard computer compares the credible battery voltage with the battery full charge voltage threshold _Vc . If the battery voltage is lower than _Vc within the preset duration, it is determined that the battery is not fully charged in the current cycle, and an event report is generated and broadcast to the ground through the downlink channel.

Specifically, in step S1, the battery voltage acquisition circuit is generally a two-terminal acquisition circuit commonly used in satellites, or the voltage information obtained by the intelligent unit through a sensor, and the processing adopted includes signal amplification, A/D conversion, etc. Data interaction bus, the data communication bus between the telemetry acquisition equipment and the onboard computer, includes RS422, 1553B, CAN bus, etc.

Specifically, in step S2, the necessity of judging the credibility of battery voltage telemetry is that the collected voltage value cannot represent the real battery voltage due to the influence of the satellite operating space environment, the decline of circuit reliability, the degradation of component performance, the abnormal operation of the intelligent unit software, the bit error of the data transmission link, etc. At this time, using battery voltage telemetry as a judgment criterion may lead to misjudgment, and then erroneously trigger subsequent protection operations, resulting in unnecessary interruption of satellite functions or services. The method of judging the credibility of telemetry includes judging whether the reference voltage of the acquisition circuit is normal, whether the intelligent unit bus communication is normal, and whether the intelligent unit software is running normally. If multiple battery voltage telemetry is obtained in step S1, the credibility of each telemetry is judged separately.

In step S3, if multiple battery voltage telemetry is obtained in step S1, each telemetry is compared with the undervoltage protection threshold _Vm to obtain multiple comparison results, and a fusion judgment is performed on the multiple comparison results, including three-out-of-two, assigning weighted coefficients, etc. It is determined whether the battery is undervoltage based on the fusion judgment result.

Specifically, in step S4, the battery undervoltage protection operation is a sequence of instructions pre-stored in the onboard computer. The battery voltage continues to decrease. Possible reasons include: unreasonable arrangement of payload tasks leading to an energy crisis in the satellite, short circuit and other faults at the power distribution end leading to abnormal energy consumption, abnormal satellite attitude or incorrect orbit use by the control subsystem leading to abnormal battery charging. The battery undervoltage protection operation sequence is designed to reduce satellite energy consumption while maximizing battery charging. It includes: executing a payload safety shutdown program sequence, disconnecting part of the satellite's power distribution path, canceling the payload task, adjusting the temperature control threshold of some heating circuits or disconnecting some heating circuits, and further reducing satellite energy consumption.

In step S4, the battery undervoltage protection operation support is set to "allow" or "disable". The preset battery undervoltage protection operation instruction sequence supports modification.

In step S4, the event report records the event code reflecting the battery undervoltage, the time when the battery undervoltage event occurs, and the detailed information of the battery undervoltage event, including the real-time measured battery voltage telemetry value and the battery undervoltage protection threshold used for determination.

Specifically, in step S5, the onboard computer sends the battery undervoltage status information to the satellite control subsystem through the data exchange bus. The control subsystem determines whether the received battery undervoltage status information is valid. At the same time, the control subsystem is designed with an "allow response" mark. When this mark is "allowed" and the battery undervoltage status information is valid, the control subsystem completes the solar orientation operation to ensure the charging of the battery. Specifically, the solar orientation operation includes zeroing the sailboard, driving the actuator according to the output information of the sensor, and performing attitude maneuvers to complete the solar orientation. Specifically, the sensors used include digital solar sensors and analog solar sensors, and the actuators include momentum wheels, control torque gyroscopes, and thrusters.

Specifically, in step S7, the warning support for the battery not fully charged can be set to "allow" or "disable", so as to avoid the false triggering of the warning when the star service computer runs abnormally or has logical errors.

In step S7, the method of steps S1 to S2 is used to obtain multiple reliable battery voltage telemetry data, and each telemetry data is compared with the battery full charge voltage threshold _Vc to obtain multiple comparison results. The multiple comparison results are subjected to fusion judgment, including three-out-of-two, weighted coefficient assignment, etc. It is determined whether the battery is not fully charged during the cycle according to the fusion judgment result.

The undervoltage protection threshold _Vm and the battery full charge voltage threshold _Vc in step S3 and step S7 can be selected according to the characteristics of the lithium-ion battery, and can be modified on-track.

The method of the present invention can be further expanded to:

Step S1: Acquisition of battery voltage telemetry information: Acquisition and processing of one or more battery voltage telemetry information is performed through one or more sensors or telemetry acquisition circuits, and transmission to the onboard computer via a data exchange bus;

Step S2: judging the credibility of battery voltage telemetry: judging the validity of battery voltage telemetry to determine whether the battery voltage obtained in step S1 is credible, and the judging method includes analyzing the working state of the sensor, the state of the acquisition circuit, the communication state of the data exchange bus, or the analysis of the integration of these aspects;

Step S3: Battery low voltage warning judgment: The onboard computer compares the credible battery voltage with the warning threshold _Vw . If the battery voltage is lower than the threshold _Vw within the preset abnormal duration, it is determined that a low voltage warning has occurred.

Step S4: Battery low voltage warning protection operation: After the judgment in step S3, if the battery has a low voltage warning, then when the handling operation is "allowed", the battery low voltage warning protection is performed and the preset protection operation sequence is executed. Generate an event report and broadcast it to the ground through the downlink channel;

Step S5: battery undervoltage judgment: the onboard computer compares the reliable battery voltage with the undervoltage protection threshold V _m . If the battery voltage is lower than V _m within the preset abnormal duration, it is determined that the battery is undervoltage.

Step S6: Battery undervoltage protection operation: After the judgment in step S5, if the battery is undervoltage, then when the handling operation is "allowed", the battery undervoltage protection is performed and the preset protection operation sequence is executed. The event report is generated and broadcasted to the ground through the downlink channel;

Step S7: The onboard computer sends the battery undervoltage status to the control subsystem via the data exchange bus, and the control subsystem completes the solar orientation to ensure the charging of the battery;

Step S8: Determine the orbital position of the satellite: the onboard computer obtains the current orbital position of the satellite and determines whether the satellite is currently in the transition from the illumination period to the earth shadow period;

Step S9: Battery charging cycle not fully charged warning: After the judgment in step S8, if the satellite is currently in the transition from the illumination period to the Earth shadow period, then when the charging not fully charged warning operation is "allowed", the onboard computer compares the credible battery voltage with the battery full charge voltage threshold _Vc . If the battery voltage is lower than _Vc within the preset duration, it is determined that the battery is not fully charged in the current cycle, and an event report is generated and broadcast to the ground through the downlink channel.

Specifically, in step S3, if multiple battery voltage telemetry is obtained in step S1, each telemetry is compared with the warning threshold _Vw to obtain multiple comparison results, and a fusion judgment is performed on the multiple comparison results, including three-out-of-two, assigning weighted coefficients, etc. Determine whether the battery has a low voltage warning according to the fusion judgment result.

Specifically, in step S4, the low voltage warning protection operation is an instruction sequence pre-stored in the onboard computer. The reasons for the battery voltage being too low include: the battery charging control is abnormal and the battery charging fails to be performed according to the designed control strategy. A protection operation sequence is designed for these possible reasons, including: switching the charging control curve, and setting the low voltage warning disposal operation to "prohibit". The preset low voltage warning protection operation instruction sequence supports modification. The battery low voltage warning disposal operation supports being set to "allow" or "prohibit". Specifically, in step S4, the event report record also reflects the event code of this warning, the time when the low voltage warning occurs, and the detailed information of the low voltage warning event, including the real-time measured battery voltage telemetry value, and the warning threshold used for judgment.

Specifically, in step S5, the undervoltage protection threshold _Vm should be less than the warning threshold _Vw in step S3. The warning threshold _Vw , undervoltage protection threshold _Vm and battery full charge voltage threshold _Vc in steps S3, S5 and S9 can be selected according to the characteristics of the lithium-ion battery, and can be modified on-track.

Specifically, in step S9, the event report record reflects the event code of the warning that the battery is not fully charged during the current cycle, the time when the satellite changes from the illumination period to the earth shadow period, the time when the warning event occurs, and detailed information of the warning event that the battery is not fully charged during the current cycle, including the real-time measured battery voltage telemetry value and the battery full charge voltage threshold used for judgment.

Hereinafter, the technical solution of the present invention is further described in detail in conjunction with the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that these drawings only depict typical embodiments of the present invention, and the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art. It should be pointed out that, for those of ordinary skill in the art, without departing from the concept of the present invention, the steps contained in the present invention can be disassembled or recombined, and these all belong to the protection scope of this specification. In different embodiments of the present invention, the above-mentioned steps S3 and S4 can be controlled not to be implemented according to the design of the system, which will not affect the implementation effect of the present invention.

The present invention provides an autonomous undervoltage protection method for a remote sensing satellite battery. By predicting the discharge of the battery, an early warning message is generated when the voltage does not reach the undervoltage protection threshold, and timely processing is carried out to ensure the safety of the satellite and timely recharge the battery.

As shown in FIG1 , it is a flowchart of the method of the present invention.

Embodiment 1:

As shown in FIG. 2 , it is a flowchart of Embodiment 1 of the method of the present invention.

S1 collects battery voltages through the two telemetry acquisition channels of the platform data interface unit and the power controller, and obtains three battery voltage telemetry values, recorded as _VB1 , _VB2 and _VB3 . After A/D conversion, they are organized into telemetry source packets and sent to the system management unit through the 1553B bus.

The S2 system management unit determines the credibility of the battery voltage telemetry. As shown in Figure 3, in addition to the battery voltage telemetry, the telemetry source packet also transmits the acquisition circuit calibration voltage and packet sequence count information to the system management unit. The acquisition circuit calibration voltage reflects whether the working status of the telemetry acquisition channel is normal. In the design of the platform data interface unit and the power controller software, the packet sequence count is +1 in each telemetry source packet generation cycle. Therefore, whether the packet sequence count continues to change reflects whether the platform data interface unit software and the power controller software are running normally. When the system management unit determines that the calibration voltage is normal and the packet sequence count increases, the corresponding _VB1 , _VB2 and _VB3 received from the 1553B bus are valid, and the valid _VB1 , _VB2 and _VB3 will be credible.

The S3 system management unit continuously compares the reliable battery voltages _VB1 , _VB2 and _VB3 with the warning threshold _Vw respectively. If _VBi (i＝1,2,3) is less than _Vw for 10 seconds, the comparison result of this circuit is set to _Ri ＝1(i＝1,2,3), otherwise _Ri ＝0(i＝1,2,3). Take two out of three for _Ri (i＝1,2,3). If any two values of _R1 , _R2 and _R3 are equal to 1, it is judged that the battery has a low voltage warning. The warning threshold _Vw can be modified on-track.

S4 When the "battery low voltage warning protection operation" flag is "allowed", the system management unit executes the battery low voltage warning protection operation sequence: switching the battery charging control mode, and then setting the "battery low voltage warning protection operation" flag to "prohibited". Generate a battery low voltage warning event report. The battery low voltage warning protection operation can be set to "allowed" or "prohibited".

The S5 system management unit continuously compares the reliable battery voltages _VB1 , _VB2 and _VB3 with the undervoltage protection threshold _Vm . If _VBi (i＝1,2,3) is less than _Vm for 10 seconds, the comparison result of this circuit is set to _Li ＝1 (i＝1,2,3), otherwise _Li ＝0 (i＝1,2,3). Take two out of three for _Li (i＝1,2,3). If any two values of _L1 , _L2 and _L3 are equal to 1, it is judged that the battery has undervoltage. The undervoltage protection threshold _Vm can be modified on-track.

S6 When the "battery undervoltage protection operation" flag is "allowed", the system management unit executes the battery undervoltage protection operation sequence, which is executed in sequence: delete all unexecuted tasks, execute the payload shutdown program sequence, execute the satellite minimum energy mode setting sequence including shutting down the navigation receiver, disconnecting the data transmission and payload power distribution channels, disconnecting some heater circuits and adjusting the temperature control thresholds of some heater circuits to reduce thermal control power consumption, and setting the "battery undervoltage protection operation" flag to "prohibited". Generate a battery low voltage and undervoltage event report.

The battery low voltage protection operation can be set to "allow" or "disable".

The S7 system management unit sends the battery undervoltage status information to the control subsystem central control unit via the 1553B bus.

Specifically, the battery undervoltage status information is sent to the central control unit through a data packet designed in accordance with the 1553B bus communication protocol and having a set format and data error control. After the central control unit determines that the format of the data packet is correct, complies with the protocol design agreement, and the checksum is correct, and if the control subsystem "responds to the battery undervoltage protection notification" is allowed, it will complete the rate damping, solar search, and solar orientation in sequence, and can maintain the solar orientation mode to ensure the battery charging and further wait for ground processing. If the control subsystem "responds to the battery undervoltage protection notification" is prohibited, the central control unit ignores the received battery undervoltage status information and does not operate.

The S8 system management unit obtains the parameter solar vector Soz of the control subsystem and makes a judgment: if Soz reaches 0.373 during the increase process, it is determined that the satellite is in the transition from the illumination period to the earth shadow period.

S9: When the "battery current cycle charging not fully charged warning" flag is "allowed", the system management unit continuously compares the credible battery voltage (i.e., re-acquired by the method of S1-S2) _VB1 , _VB2 and _VB3 with the battery full charge voltage threshold _Vc . If _VBi (i=1,2,3) is less than _Vc for 5 seconds, then the comparison result of this path is set to _Ci =1 (i=1,2,3), otherwise _Ci =0 (i=1,2,3). Take two out of three for _Ci (i=1,2,3). If any two values of _Ci , _C2 and _C3 are equal to 1, it is determined that the battery current cycle charging is not fully charged. The system management unit generates a battery current cycle charging not fully charged event report. The battery full charge voltage threshold _Vc can be modified on-track.

The battery charging warning can be set to "allow" or "disable".

The format of the event report in steps S4, S6 and S9 is shown in Table 1.

Table 1

Specifically, in step S4, the battery low voltage early warning protection operation sequence is an instruction sequence stored in the system management unit read-write memory, and the content and timing of the instruction sequence can be modified by the ground injection instruction. In step S6, the battery undervoltage protection operation sequence is an instruction sequence stored in the system management unit read-write memory, and the content and timing of the instruction sequence can be modified by the ground injection instruction.

Embodiment 2:

FIG4 is a flowchart of the second embodiment of the method of the present invention.

S1 obtains the battery voltage through a telemetry acquisition channel of the dual remote unit, which is recorded as _VB1 . The equalizer configured on the satellite, in addition to completing the lithium-ion battery equalization control function, collects the battery voltage, which is recorded as _VB2 , and sends _VB2 and the equalizer reference voltage to the power controller through the RS422 bus. The dual remote unit and the power controller organize the telemetry source packets respectively and send them to the central processing unit through the 1553B bus.

The S2 central processing unit determines the reliability of the battery voltage telemetry. The judgment criteria are:

S2.1 Dual remote unit 1553B bus polling is normal

S2.2 The voltage of other remote units collected by the dual remote units is within the normal range

When S2.1 and S2.2 are satisfied at the same time, the central processing unit determines that _VB1 is valid.

S2.3 Power controller 1553B bus polling is normal

S2.4 The equalizer reference voltage is within the normal range

When S2.3 and S2.4 are satisfied at the same time, the central processing unit determines that _VB2 is valid.

Valid _VB1 and _VB2 will be accepted.

S3 The central processing unit continuously compares the reliable battery voltages _VB1 and _VB2 with the undervoltage protection threshold _Vm . If _VBi (i＝1,2) is less than _Vm for 60 seconds, the comparison result of this circuit is set to _Li ＝1(i＝1,2), otherwise _Li ＝0(i＝1,2). If any value of _L1 or _L2 is equal to 1, it is judged that the battery has an undervoltage. The undervoltage protection threshold _Vm can be modified on-track.

S4 When the "battery undervoltage protection operation" is marked as "allowed", the central processing unit executes the battery undervoltage protection operation sequence, which is executed in sequence: deleting all unexecuted instructions and tasks, executing the payload shutdown program sequence, and executing the satellite minimum energy mode setting sequence, including shutting down the navigation receiver, disconnecting the data transmission and payload power distribution channels, disconnecting some heater circuits and adjusting the temperature control thresholds of some heater circuits to reduce thermal control power consumption, and shutting down the power amplifier. Generate a battery low voltage event report.

The battery low voltage protection operation can be set to "allow" or "disable".

The S6 central processing unit sends a battery undervoltage status instruction to the central control computer of the control subsystem through the 1553B bus.

Specifically, the battery undervoltage status information is sent to the control computer through a remote control command with a set format and coding designed in accordance with the 1553B bus communication protocol. After the control computer determines that the command format is correct, the command coding conforms to the pre-designed, the checksum is correct, and if the control subsystem "responds to the battery undervoltage protection notification" is allowed, the rate damping, solar search and solar orientation are completed in sequence, and the solar orientation mode can be maintained to ensure the battery charging and further wait for ground processing. If the control subsystem "responds to the battery undervoltage protection notification" is prohibited, the central control unit ignores the received battery undervoltage status information and does not operate.

The S6 central processing unit obtains the parameter solar vector Soz of the control subsystem and makes a judgment: if Soz reaches 0.373 during the increase process, it is determined that the satellite is in the transition from the illumination period to the earth shadow period.

S7 When the "battery current cycle charging under-full warning" flag is "allowed", the central processing unit continuously compares the credible battery voltage (i.e., re-acquired by the method of S1-S2) _VB1 and _VB2 with the battery full charge voltage threshold _Vc . If _VBi (i＝1,2) is less than _Vc for 5 seconds, the comparison result of this circuit is set to _Ci ＝1(i＝1,2), otherwise _Ci ＝0(i＝1,2). If any value of _Ci or _C2 is equal to 1, it is determined that the battery current cycle charging is under-full. The central processing unit generates a battery current cycle charging under-full event report. The battery full charge voltage threshold _Vc can be modified on-track.

The battery charging warning can be set to "allow" or "disable".

The contents not described in detail in the specification of the present invention belong to the common knowledge of those skilled in the art.

Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims (6)

1. The autonomous under-voltage protection method for the remote sensing satellite storage battery is characterized by comprising the following steps of:

Step S1: acquiring voltage telemetry data of the storage battery through a sensor or a telemetry acquisition circuit, and transmitting the voltage telemetry data to a spaceborne computer;

Step S2: the satellite-borne computer judges whether the remote measurement data of the storage battery voltage is credible or not according to one or more factors of the working state of the sensor, the state of the acquisition circuit and the communication state of the data interaction bus;

Step S3: the satellite-borne computer compares the storage battery voltage in the credible storage battery voltage telemetry data with an undervoltage protection threshold V _m, and if the storage battery voltage is lower than V _m within the preset abnormal duration, the storage battery is judged to have an undervoltage, and the step S4 is carried out;

step S4: performing battery under-voltage protection, including one or more of: executing a load safety shutdown program control sequence, disconnecting a satellite part power distribution channel, canceling a load task, adjusting a heating loop temperature control threshold value, and disconnecting a heating loop;

Step S5: the satellite-borne computer sends the under-voltage state of the storage battery to the control subsystem, and the control subsystem enables the solar cell array to finish sun orientation, so that the charging of the storage battery is ensured; wherein the control subsystem is provided with an enabling control for enabling or disabling the solar array to orient the sun.

2. The method for protecting the autonomous under-voltage of the remote sensing satellite storage battery according to claim 1, wherein when the voltage telemetry data of the storage battery comprises a plurality of measurement results, a method of taking two three times or giving a weighting coefficient is adopted to judge whether the under-voltage of the battery occurs.

3. The method according to claim 1, wherein in step S4, an enabling control is provided for enabling or disabling the under-voltage protection of the battery.

4. The method for autonomous under-voltage protection of a remote sensing satellite storage battery according to claim 1, further comprising, after step S5:

step S6: the satellite-borne computer acquires the current orbit position of the satellite and judges whether the satellite is currently in the conversion from the illumination period to the ground shadow period;

Step S7: if the satellite is currently in the illumination period to the ground shadow period, the satellite-borne computer obtains the reliable storage battery voltage and compares the reliable storage battery voltage with the storage battery full charge voltage threshold V _c, and if the reliable storage battery voltage is lower than V _c within the preset duration, the storage battery is judged to be not fully charged when the storage battery is charged.

5. The autonomous under-voltage protection method for the remote sensing satellite storage battery is characterized by comprising the following steps of:

Step S10: acquiring voltage telemetry data of the storage battery through a sensor or a telemetry acquisition circuit, and transmitting the voltage telemetry data to a spaceborne computer;

Step S20: the satellite-borne computer judges whether the remote measurement data of the storage battery voltage is credible or not according to one or more factors of the working state of the sensor, the state of the acquisition circuit and the communication state of the data interaction bus;

Step S30: low-voltage early warning judgment of the storage battery: the space-borne computer compares the credible storage battery voltage with a warning threshold V _w, if the storage battery voltage is lower than the threshold V _w within the preset abnormal duration, the low-voltage early warning is judged to occur, the step S40 is shifted to execute the low-voltage early warning protection of the storage battery;

And (3) judging the undervoltage of the storage battery: the satellite-borne computer compares the storage battery voltage in the credible storage battery voltage telemetry data with an undervoltage protection threshold V _m, if the storage battery voltage is lower than V _m within the preset abnormal duration, the storage battery is judged to have an undervoltage, and the step S40 is carried out to execute the undervoltage protection of the storage battery;

step S40: the storage battery under-voltage protection enabling control is arranged and used for enabling or disabling the storage battery under-voltage protection; the storage battery low-voltage early-warning treatment enabling control is arranged and used for enabling or disabling the execution of the storage battery low-voltage early-warning treatment; and executing low-voltage early warning protection of the storage battery, wherein the low-voltage early warning protection comprises one or more of the following operations: switching the charging control curve, and setting the low-voltage early warning treatment operation to be forbidden;

Performing battery under-voltage protection, including one or more of: executing a load safety shutdown program control sequence, disconnecting a satellite part power distribution channel, canceling a load task, adjusting a heating loop temperature control threshold value, and disconnecting a heating loop;

step S50: the satellite-borne computer sends the under-voltage state of the storage battery to the control subsystem, and the control subsystem enables the solar cell array to finish sun orientation, so that the charging of the storage battery is ensured.

6. The method for autonomous under-voltage protection of a remote sensing satellite storage battery according to claim 5, further comprising, after step S50:

Step S60: the satellite-borne computer acquires the current orbit position of the satellite and judges whether the satellite is currently in the conversion from the illumination period to the ground shadow period;

Step S70: if the satellite is currently in the illumination period to the ground shadow period, the satellite-borne computer obtains the reliable storage battery voltage and compares the reliable storage battery voltage with the storage battery full charge voltage threshold V _c, and if the reliable storage battery voltage is lower than V _c within the preset duration, the storage battery is judged to be not fully charged when the storage battery is charged.