Vehicle dual redundant power supply control system based on photovoltaic power generation

Abstract

The invention discloses a vehicle dual redundant power supply control system based on photovoltaic power generation, which comprises a photovoltaic power generation subsystem, a bidirectional power supply conversion device, a main switch contactor, a lithium battery pack, a vehicle-mounted power generation system, a control module, an engine and an engine controller. Energy supply of the lithium battery is achieved, the power supply capacity of the vehicle in the running process is guaranteed, it is guaranteed that the vehicle lithium battery system does not need to excessively worry about the charging maintenance problem of the lithium battery even in the extremely cold environment, and the electric quantity requirement when the vehicle system needs to be started emergently is guaranteed; the problems that the vehicle is difficult to start in the high and cold environment, and the starting preparation time is long are effectively solved.

Description

Technical Field

[0001] The present invention relates to the field of automatic control technology, and in particular to a vehicle dual-redundant power supply control system based on photovoltaic power generation. Background Art

[0002] Special vehicles now have problems with starting difficulties and long starting preparation time in high-altitude and cold environments. Diesel engines may be difficult to start under low temperature conditions. If effective forced starting measures are not taken, it is likely to further aggravate the cold wear phenomenon in the diesel cylinder, increase the battery discharge intensity, and shorten its service life. If the starter motor is overloaded under low temperature conditions, the failure rate of the starter motor will be greatly increased; if a new lithium battery is used to replace the original lead-acid battery of the vehicle in situ, and cooperate with the new generator heating system, it can meet the needs of one-button starting of special vehicles in extremely cold environments in plateau areas, and improve the combat readiness and duty capabilities of special vehicles. However, due to the reliance on new lithium batteries, whether the new lithium battery is charged and maintained in time has become a key factor affecting the performance of the new lithium battery. If the energy replenishment and maintenance of the lithium battery cannot be effectively achieved, the problem of vehicle starting difficulties in high-altitude and cold environments cannot be solved.

[0003] Therefore, whether it is possible to solve the problem of lithium battery energy replenishment and maintenance when the vehicle is in silent duty conditions, and at the same time improve the vehicle's power supply capacity during driving has become an urgent problem to be solved in this field. Summary of the invention

[0004] In view of this, the present invention provides a vehicle dual-redundant power supply control system based on photovoltaic power generation, which can realize energy replenishment of lithium batteries and provide guarantee for the power supply capacity of the vehicle during driving through the cooperation of on-board photovoltaic cell components and power generation systems.

[0005] A vehicle dual-redundant power supply control system based on photovoltaic power generation, comprising: a photovoltaic power generation subsystem, a bidirectional power conversion device, a main switch contactor, a lithium battery pack, a vehicle-mounted power generation system, a control module, an engine and an engine controller;

[0006] One end of the bidirectional power conversion device is connected to the photovoltaic power generation system, and the other end is connected to the lithium battery. The lithium battery is also connected to the vehicle power generation system. The main switch contactor controls the on-off of the circuit of the lithium battery and the vehicle power generation system. The engine is connected to the generator, and the engine controller is connected to the engine. The control module is connected to the bidirectional power conversion device, the lithium battery, the vehicle power generation system and the engine controller through the system bus;

[0007] Photovoltaic power generation subsystem, which performs photovoltaic power generation and provides a partial source of electricity for the system;

[0008] Bidirectional power converter, controlling the voltage and current on both sides of the converter

[0009] Lithium battery pack, as an on-board energy storage power source, realizes two-way transmission of electric energy;

[0010] On-board power generation system, used as vehicle power source when starting;

[0011] The control module sends control signals to the bidirectional power conversion device, the vehicle-mounted power generation system and the engine controller according to the remaining power and temperature of the lithium battery pack;

[0012] Engine, the vehicle's power source;

[0013] Engine controller, controls the operating status of the engine.

[0014] Further, the photovoltaic power generation subsystem includes: a vehicle-mounted photovoltaic power generation component, a photovoltaic circuit positive contactor, and a photovoltaic circuit negative contactor;

[0015] The positive pole of the vehicle-mounted photovoltaic power generation component is connected to the bidirectional power conversion device through the positive pole contactor of the photovoltaic circuit, and the negative pole of the vehicle-mounted photovoltaic power generation component is connected to the bidirectional power conversion device through the negative pole contactor of the photovoltaic circuit. The two-wire power conversion device controls the on-off of the positive pole contactor of the photovoltaic circuit and the negative pole contactor of the photovoltaic circuit.

[0016] Furthermore, the vehicle-mounted power generation system comprises: a generator and a generator controller;

[0017] The generator is driven by the engine, connected to the lithium battery pack, and controlled by the generator controller.

[0018] Furthermore, the control module sends a control instruction, which specifically includes the following contents:

[0019] (i) When setting the vehicle to lithium battery pack charging mode, perform the following setting operations:

[0020] (1) If the engine speed of the vehicle does not exceed 50 rpm, close the positive contactor and negative contactor of the on-board photovoltaic module and open the main switch contactor;

[0021] If the remaining power of the lithium battery pack is ≤80% and the temperature of the lithium battery pack is ≤45°C, the bidirectional power conversion device is controlled to operate in a constant current condition, the maximum charging current is ≤1.5C, and the maximum voltage of the bidirectional power conversion device is ≤33V;

[0022] If the remaining power of the lithium battery pack is ≤80% and the temperature of the lithium battery pack is 45℃<≤60℃, the bidirectional power conversion device is controlled to operate in a constant current condition, the maximum charging current is ≤0.5C, and the maximum voltage of the bidirectional power conversion device is ≤33V;

[0023] If the remaining power of the lithium battery pack is ≤80% and the temperature of the lithium battery pack is >60°C, the bidirectional power conversion device will stop working and the positive contactor and negative contactor of the photovoltaic circuit will be disconnected;

[0024] If 80%<the remaining power of the lithium battery pack≤90%, and the temperature of the lithium battery pack≤45℃, the bidirectional power conversion device is controlled to operate in a constant current condition, the maximum charging current≤1C, and the maximum voltage of the bidirectional power conversion device≤33V;

[0025] If 80%<the remaining power of the lithium battery pack≤90%, 45℃<the temperature of the lithium battery pack≤60℃, the bidirectional power conversion device is controlled to operate under constant current conditions, the maximum charging current≤0.5C, and the maximum voltage of the bidirectional power conversion device≤33V;

[0026] If the remaining power of the lithium battery pack is 80% < ≤ 90% and the temperature of the lithium battery pack is 60°C < the temperature of the lithium battery pack, the bidirectional power conversion device stops working and the bidirectional power conversion device turns off the positive contactor of the photovoltaic circuit and the negative contactor of the photovoltaic circuit;

[0027] If 90%<the remaining power of the lithium battery pack≤95%, and the temperature of the lithium battery pack is<60℃, the bidirectional power conversion device is controlled to operate in a constant current condition, the maximum charging current is ≤0.5C, and the maximum voltage of the bidirectional power conversion device is ≤33V;

[0028] If the remaining power of the lithium battery pack is 80% < ≤ 90% and the temperature of the lithium battery pack is 60°C < ≤ 90%, the bidirectional power conversion device stops working and shuts off the positive contactor and negative contactor of the photovoltaic circuit;

[0029] (2) If the vehicle's engine speed is not less than 1200rpm, disconnect the positive contactor and negative contactor of the on-board photovoltaic module, and close the main switch contactor; if the engine speed is 1600rpm, enter the fast charging mode. When the temperature of the lithium battery pack exceeds 60℃, disconnect the main switch contactor and stop charging the lithium battery pack; if the engine speed range is 1200rpm, enter the slow charging mode. When the temperature of the lithium battery pack exceeds 60℃, disconnect the main switch contactor.

[0030] (ii) When setting the vehicle to power supply mode, perform the following setting operations:

[0031] At the same time, close the positive contactor of the on-board photovoltaic module, the negative contactor of the on-board photovoltaic module and the main switch contactor, and set the bidirectional power conversion device to operate at a constant voltage of 28V.

[0032] Beneficial effects:

[0033] 1. The vehicle-mounted photovoltaic power generation assembly introduced in the present invention can enable the vehicle to continuously charge the vehicle's lithium battery pack through the photovoltaic assembly as needed even when the vehicle is not started, ensuring that the vehicle's lithium battery system does not need to worry too much about the charging and maintenance of the lithium battery even in an extremely cold environment, ensuring the power demand of the vehicle system when emergency starting is required, and effectively solving the problem of difficulty in starting the vehicle in an extremely cold environment and a long starting preparation time;

[0034] 2. In the present invention, by adding a bidirectional power conversion device, the system forms a set of stable lithium battery dual redundant charging circuit and power supply circuit, which not only solves the original battery charging problem in the high-cold environment, but also ensures the subsequent stability of the system. When the vehicle is started, the vehicle can choose whether to connect to the synchronous power supply of the photovoltaic power generation system according to demand. If the synchronous connection of the two power supply circuits is selected, the power supply stability of the circuit can be guaranteed;

[0035] 3. The control module in this system can intelligently set the corresponding working state and the opening and closing state of the required circuit according to the battery status and engine speed, and can effectively make the most intelligent choice for the battery status, protect the battery as much as possible, and extend the battery life;

[0036] 4. The dividing points of the speed range are set mainly at 50rpm, 1200rpm and 1600rpm as typical values. Such value segmentation can better fit the actual state of the vehicle during operation, ensure that the system operation is more in line with the actual operation requirements, and ensure the reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the principle structure of a dual-redundant power supply control circuit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0038] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0039] The present invention provides a vehicle dual-redundant power supply control system based on photovoltaic power generation. The main purpose of this system is to utilize photovoltaic power generation to realize the charging and maintenance of lithium batteries of special vehicles in silent duty conditions, while improving the charging safety of lithium batteries. Therefore, this system can realize energy replenishment of lithium batteries and provide guarantee for the power supply capacity of the vehicle during driving through the cooperation of on-board photovoltaic battery components and power generation systems.

[0040] In this embodiment, a vehicle dual redundant power supply control system based on photovoltaic power generation is provided. Figure 1As shown, it includes: a photovoltaic power generation subsystem, a bidirectional power conversion device, a main switch contactor, a lithium battery pack, an on-board power generation system, a control module, an engine and an engine controller; As shown in the above content, this system mainly realizes a dual redundant power supply and charging circuit for special vehicles by adding a photovoltaic power generation subsystem.

[0041] One end of the bidirectional power conversion device is connected to the photovoltaic power generation system, and the other end is connected to the lithium battery. The lithium battery is also connected to the vehicle power generation system. The main switch contactor controls the on-off of the circuit of the lithium battery and the vehicle power generation system. The engine is connected to the generator, and the engine controller is connected to the engine. The control module is connected to the bidirectional power conversion device, the lithium battery, the vehicle power generation system and the engine controller through the system bus;

[0042] Photovoltaic power generation system uses the photoelectric effect to convert solar energy into electrical energy for photovoltaic power generation, providing part of the power source for the system;

[0043] Bidirectional power conversion device, the main function of the bidirectional power conversion device is to control the voltage and current on both sides, and both sides can work at constant current or constant voltage. The bidirectional power conversion device adjusts the voltage and output current on the lithium battery side according to the state of the lithium battery SOC, and can also connect and disconnect the photovoltaic circuit positive contactor and photovoltaic circuit negative contactor on the photovoltaic module side;

[0044] Lithium battery pack, as an on-board energy storage power source, realizes two-way transmission of electric energy;

[0045] On-board power generation system, used as vehicle power source when starting;

[0046] The control module sends control signals to the bidirectional power conversion device, the vehicle-mounted power generation system and the engine controller according to the remaining power and temperature of the lithium battery pack;

[0047] Engine: The engine is the power source of special vehicles. It not only provides power for the integrated transmission device, but also provides power for the power generation system. When the engine is working, it also drives the generator to rotate;

[0048] The engine controller controls the operation of the engine and can also collect the engine's operating parameters to control the engine's operating status.

[0049] The photovoltaic power generation subsystem includes: a vehicle-mounted photovoltaic power generation component, a photovoltaic circuit positive contactor and a photovoltaic circuit negative contactor;

[0050] Photovoltaic circuit positive contactor: controls the connection between the positive pole of the on-board photovoltaic power generation component and the positive pole of the bidirectional power conversion device;

[0051] Photovoltaic circuit negative pole contactor: controls the connection between the negative pole of the on-board photovoltaic power generation component and the negative pole of the bidirectional power conversion device;

[0052] The positive pole of the vehicle-mounted photovoltaic power generation component is connected to the bidirectional power conversion device through the positive pole contactor of the photovoltaic circuit, and the negative pole of the vehicle-mounted photovoltaic power generation component is connected to the bidirectional power conversion device through the negative pole contactor of the photovoltaic circuit. The two-wire power conversion device controls the on-off of the positive pole contactor of the photovoltaic circuit and the negative pole contactor of the photovoltaic circuit.

[0053] The vehicle-mounted power generation system comprises: a generator and a generator controller;

[0054] The generator is driven by the engine, connected to the lithium battery pack, and controlled by the generator controller.

[0055] Among them, the connection form of each system is mainly through system cables, which include transmission cables, system control cables and bus communication cables;

[0056] Among them, the main control is the control module, which can be directly controlled by the vehicle's central control system and can communicate with almost all vehicle components. The control module sends control instructions, which specifically include the following:

[0057] (i) When setting the vehicle to lithium battery pack charging mode, perform the following setting operations:

[0058] (1) If the engine speed of the vehicle does not exceed 50 rpm, close the positive contactor and negative contactor of the on-board photovoltaic module and open the main switch contactor;

[0059] If the remaining power of the lithium battery pack is ≤80% and the temperature of the lithium battery pack is ≤45°C, the bidirectional power conversion device is controlled to operate in a constant current condition, the maximum charging current is ≤1.5C, and the maximum voltage of the bidirectional power conversion device is ≤33V;

[0060] If the remaining power of the lithium battery pack is ≤80% and the temperature of the lithium battery pack is 45℃<≤60℃, the bidirectional power conversion device is controlled to operate in a constant current condition, the maximum charging current is ≤0.5C, and the maximum voltage of the bidirectional power conversion device is ≤33V;

[0061] If the remaining power of the lithium battery pack is ≤80% and the temperature of the lithium battery pack is >60°C, the bidirectional power conversion device will stop working and the positive contactor and negative contactor of the photovoltaic circuit will be disconnected;

[0062] If 80%<the remaining power of the lithium battery pack≤90%, and the temperature of the lithium battery pack≤45℃, the bidirectional power conversion device is controlled to operate in a constant current condition, the maximum charging current≤1C, and the maximum voltage of the bidirectional power conversion device≤33V;

[0063] If 80%<the remaining power of the lithium battery pack≤90%, 45℃<the temperature of the lithium battery pack≤60℃, the bidirectional power conversion device is controlled to operate under constant current conditions, the maximum charging current≤0.5C, and the maximum voltage of the bidirectional power conversion device≤33V;

[0064] If the remaining power of the lithium battery pack is 80% < ≤ 90% and the temperature of the lithium battery pack is 60°C < the temperature of the lithium battery pack, the bidirectional power conversion device stops working and the bidirectional power conversion device turns off the positive contactor of the photovoltaic circuit and the negative contactor of the photovoltaic circuit;

[0065] If 90%<the remaining power of the lithium battery pack≤95%, and the temperature of the lithium battery pack is<60℃, the bidirectional power conversion device is controlled to operate in a constant current condition, the maximum charging current is ≤0.5C, and the maximum voltage of the bidirectional power conversion device is ≤33V;

[0066] If the remaining power of the lithium battery pack is 80% < ≤ 90% and the temperature of the lithium battery pack is 60°C < ≤ 90%, the bidirectional power conversion device stops working and shuts off the positive contactor and negative contactor of the photovoltaic circuit;

[0067] (2) If the vehicle's engine speed is not less than 1200rpm, disconnect the positive contactor and negative contactor of the on-board photovoltaic module, and close the main switch contactor; if the engine speed is 1600rpm, enter the fast charging mode. When the temperature of the lithium battery pack exceeds 60℃, disconnect the main switch contactor and stop charging the lithium battery pack; if the engine speed range is 1200rpm, enter the slow charging mode. When the temperature of the lithium battery pack exceeds 60℃, disconnect the main switch contactor.

[0068] (ii) When setting the vehicle to power supply mode, perform the following setting operations:

[0069] At the same time, close the positive contactor of the on-board photovoltaic module, the negative contactor of the on-board photovoltaic module and the main switch contactor, and set the bidirectional power conversion device to operate at a constant voltage of 28V.

[0070] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A vehicle dual-redundant power supply control system based on photovoltaic power generation, characterized in that: include: Photovoltaic power generation electronic system, bidirectional power conversion device, main switch contactor, lithium battery pack, vehicle-mounted power generation system, control module, engine and engine controller; One end of the bidirectional power conversion device is connected to the photovoltaic power generation system, and the other end is connected to the lithium battery. The lithium battery is also connected to the vehicle power generation system. The main switch contactor controls the on-off of the circuit of the lithium battery and the vehicle power generation system. The engine is connected to the generator, and the engine controller is connected to the engine. The control module is connected to the bidirectional power conversion device, the lithium battery, the vehicle power generation system and the engine controller through the system bus; Photovoltaic power generation subsystem, which performs photovoltaic power generation and provides a partial source of electricity for the system; Bidirectional power converter, controlling the voltage and current on both sides of the converter Lithium battery pack, as an on-board energy storage power source, realizes two-way transmission of electric energy; On-board power generation system, which serves as the vehicle power source when starting; The control module sends control signals to the bidirectional power conversion device, the vehicle-mounted power generation system and the engine controller according to the remaining power and temperature of the lithium battery pack; Engine, the vehicle's power source; Engine controller, controls the operating status of the engine.

2. The system according to claim 1, characterized in that The photovoltaic power generation subsystem includes: a vehicle-mounted photovoltaic power generation component, a photovoltaic circuit positive contactor and a photovoltaic circuit negative contactor; The positive pole of the vehicle-mounted photovoltaic power generation component is connected to the bidirectional power conversion device through the positive pole contactor of the photovoltaic circuit, and the negative pole of the vehicle-mounted photovoltaic power generation component is connected to the bidirectional power conversion device through the negative pole contactor of the photovoltaic circuit. The two-wire power conversion device controls the on-off of the positive pole contactor of the photovoltaic circuit and the negative pole contactor of the photovoltaic circuit.

3. The system according to claim 1 or 2, characterized in that: The vehicle-mounted power generation system comprises: a generator and a generator controller; The generator is driven by the engine, connected to the lithium battery pack, and controlled by the generator controller.

4. The system according to claim 3, characterized in that The control module sends a control instruction, which specifically includes the following contents: (i) When setting the vehicle to lithium battery pack charging mode, perform the following setting operations: (1) If the engine speed of the vehicle does not exceed 50 rpm, close the positive contactor and negative contactor of the on-board photovoltaic module and open the main switch contactor; If the remaining power of the lithium battery pack is ≤80% and the temperature of the lithium battery pack is ≤45°C, the bidirectional power conversion device is controlled to operate in a constant current condition, the maximum charging current is ≤1.5C, and the maximum voltage of the bidirectional power conversion device is ≤33V; If the remaining power of the lithium battery pack is ≤80% and the temperature of the lithium battery pack is 45℃<≤60℃, the bidirectional power conversion device is controlled to operate in a constant current condition, the maximum charging current is ≤0.5C, and the maximum voltage of the bidirectional power conversion device is ≤33V; If the remaining power of the lithium battery pack is ≤80% and the temperature of the lithium battery pack is >60°C, the bidirectional power conversion device will stop working and the positive contactor and negative contactor of the photovoltaic circuit will be disconnected; If 80%<the remaining power of the lithium battery pack≤90%, and the temperature of the lithium battery pack≤45℃, the bidirectional power conversion device is controlled to operate in a constant current condition, the maximum charging current≤1C, and the maximum voltage of the bidirectional power conversion device≤33V; If 80%<the remaining power of the lithium battery pack≤90%, 45℃<the temperature of the lithium battery pack≤60℃, the bidirectional power conversion device is controlled to operate under constant current conditions, the maximum charging current≤0.5C, and the maximum voltage of the bidirectional power conversion device≤33V; If the remaining power of the lithium battery pack is 80% < ≤ 90% and the temperature of the lithium battery pack is 60°C < the temperature of the lithium battery pack, the bidirectional power conversion device stops working and the bidirectional power conversion device turns off the positive contactor of the photovoltaic circuit and the negative contactor of the photovoltaic circuit; If 90%<the remaining power of the lithium battery pack≤95%, and the temperature of the lithium battery pack is<60℃, the bidirectional power conversion device is controlled to operate in a constant current condition, the maximum charging current is ≤0.5C, and the maximum voltage of the bidirectional power conversion device is ≤33V; If the remaining power of the lithium battery pack is 80% < ≤ 90% and the temperature of the lithium battery pack is 60°C < ≤ 90%, the bidirectional power conversion device stops working and shuts off the positive contactor and negative contactor of the photovoltaic circuit; (2) If the vehicle's engine speed is not less than 1200rpm, disconnect the positive contactor and the negative contactor of the on-board photovoltaic module, and close the main switch contactor; if the engine speed is in the first speed range, enter the fast charging mode. When the temperature of the lithium battery pack exceeds 60°C, disconnect the main switch contactor and stop charging the lithium battery pack; if the engine speed is in the second speed range, enter the slow charging mode. When the temperature of the lithium battery pack exceeds 60°C, disconnect the main switch contactor. (ii) When setting the vehicle to power supply mode, perform the following setting operations: At the same time, close the positive contactor of the on-board photovoltaic module, the negative contactor of the on-board photovoltaic module and the main switch contactor, and set the bidirectional power conversion device to operate at a constant voltage of 28V.

5. The system according to claim 4, characterized in that The first speed range is 1200rpm-1599rpm, and the second speed range is 1600rpm-3500rpm.

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