A vehicle dual-redundant power supply control system based on photovoltaic power generation

Abstract

This invention discloses a vehicle dual-redundant power supply control system based on photovoltaic power generation, comprising: a photovoltaic power generation system, 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. Through the cooperation of the on-board photovoltaic battery components and the power generation system, it can replenish the energy of the lithium battery and ensure the power supply capability during vehicle operation. This ensures that the vehicle's lithium battery system does not require excessive concern about charging and maintenance even in extremely cold environments, and guarantees the power demand of the vehicle system when emergency starting is needed. It effectively solves the problems of difficult vehicle starting and long start-up preparation time in cold environments.

Description

Technical Field

[0001] This invention relates to the field of automatic control technology, and more specifically to a vehicle dual-redundant power supply control system based on photovoltaic power generation. Background Technology

[0002] Current special vehicles face challenges in starting in high-altitude and frigid environments, including prolonged start-up preparation times. In low temperatures, diesel engines may be difficult to start, and without effective forced-start measures, cold-state wear within the diesel cylinders can be exacerbated, increasing battery discharge intensity and shortening its lifespan. Overloading the starter motor in low temperatures significantly increases its failure rate. Replacing the vehicle's original lead-acid battery with a new lithium battery, coupled with a new generator heating system, can meet the one-button start requirement for special vehicles in extremely cold environments, enhancing their combat readiness. However, this reliance on the new lithium battery makes timely charging and maintenance crucial to its performance. Ineffective energy replenishment and maintenance of the lithium battery will not solve the starting difficulties in high-altitude and frigid environments.

[0003] Therefore, whether the problem of lithium battery energy replenishment and maintenance under silent operation can be solved, and whether the power supply capacity of the vehicle can be improved 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 achieve energy replenishment of lithium batteries and ensure power supply capability during vehicle operation through the cooperation of on-board photovoltaic cell modules and power generation system.

[0005] A vehicle dual-redundant power supply control system based on photovoltaic power generation includes: a photovoltaic power generation system, 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;

[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 circuit of the lithium battery and the vehicle power generation system is controlled by the main switch contactor. 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] A photovoltaic power generation system generates electricity from photovoltaic power, providing a portion of the system's power source.

[0008] A bidirectional power converter that controls the voltage and current on both sides of the converter.

[0009] Lithium battery packs, as on-board energy storage power sources, enable bidirectional power transmission;

[0010] The onboard power generation system serves as the vehicle's power source during startup.

[0011] The control module sends control signals to the bidirectional power conversion device, the on-board power generation system, and the engine controller based on the remaining power and temperature of the lithium battery pack.

[0012] Engine, the power source of a vehicle;

[0013] The engine controller controls the engine's operating status.

[0014] Furthermore, the photovoltaic power generation system includes: an on-board photovoltaic power generation module, a photovoltaic circuit positive contactor, and a photovoltaic circuit negative contactor;

[0015] The positive terminal of the vehicle-mounted photovoltaic power generation module is connected to the bidirectional power conversion device through a photovoltaic circuit positive contactor, and the negative terminal of the vehicle-mounted photovoltaic power generation module is connected to the bidirectional power conversion device through a photovoltaic circuit negative contactor. The bidirectional power conversion device controls the on / off state of the photovoltaic circuit positive contactor and the photovoltaic circuit negative contactor.

[0016] Furthermore, the on-board power generation system includes: 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 control commands, specifically including the following:

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

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

[0021] If the remaining charge of the lithium battery pack is ≤80% and the temperature of the lithium battery pack is ≤45℃, the bidirectional power converter will operate under constant current conditions, with a maximum charging current ≤1.5C and a maximum voltage of ≤33V.

[0022] If the remaining charge of the lithium battery pack is ≤80% and the temperature of the lithium battery pack is 45℃ < ≤60℃, then the bidirectional power converter is controlled to operate under constant current conditions, with a maximum charging current ≤0.5C and a maximum voltage of ≤33V.

[0023] If the remaining charge of the lithium battery pack is ≤80% and the temperature of the lithium battery pack is >60℃, 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 charge of the lithium battery pack ≤ 90%, the temperature of the lithium battery pack ≤ 45℃, the bidirectional power converter is controlled to operate under constant current conditions, with a maximum charging current ≤ 1C and a maximum voltage of ≤ 33V.

[0025] If 80% < remaining charge of the lithium battery pack ≤ 90%, and 45℃ < lithium battery pack temperature ≤ 60℃, the bidirectional power converter should be controlled to operate under constant current conditions, with a maximum charging current ≤ 0.5C and a maximum voltage of ≤ 33V.

[0026] If 80% < the remaining charge of the lithium battery pack ≤ 90%, and 60℃ < the temperature of the lithium battery pack, then the bidirectional power conversion device will stop working and the positive and negative contactors of the photovoltaic circuit will be turned off.

[0027] If 90% < the remaining charge of the lithium battery pack ≤ 95%, the temperature of the lithium battery pack < 60℃, the bidirectional power converter is controlled to operate under constant current conditions, with a maximum charging current ≤ 0.5C and a maximum voltage of ≤ 33V.

[0028] If 80% < remaining charge of the lithium battery pack ≤ 90%, and 60℃ ≤ lithium battery pack temperature, then the bidirectional power conversion device will stop working and the positive and negative contactors of the photovoltaic circuit will be turned off.

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

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

[0031] Simultaneously close the positive contactor, negative contactor, and main switch contactor of the vehicle-mounted photovoltaic module, setting the bidirectional power conversion device to operate at a constant voltage of 28V.

[0032] Beneficial effects:

[0033] 1. The vehicle-mounted photovoltaic power generation component introduced in this invention enables the vehicle to continuously charge its lithium battery pack through the photovoltaic component even when the vehicle is not started. This ensures that the vehicle's lithium battery system does not have to worry too much about charging and maintenance issues even in extremely cold environments, and guarantees the power demand of the vehicle system when it needs to start urgently. It effectively solves the problems of difficult vehicle starting and long start-up preparation time in cold environments.

[0034] 2. In this invention, the addition of a bidirectional power conversion device enables the system to form a stable lithium battery dual redundant charging circuit and power supply circuit. This not only solves the original battery charging problem in high-altitude and cold environments, but also ensures the subsequent stability of the system. When the vehicle starts, the vehicle can choose whether to connect to the photovoltaic power generation system for synchronous power supply as needed. 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. It can effectively make the most intelligent selection based on the battery status, protect the battery as much as possible, and extend the battery life.

[0036] 4. The typical values ​​for the dividing points of the set speed range are 50 rpm, 1200 rpm, and 1600 rpm. Such value segmentation can better match the actual state of the vehicle during operation, ensuring that the system operation is more in line with the actual operating requirements and ensuring the reliability of the system. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the dual redundant power supply control circuit according to an embodiment of the present invention. Detailed Implementation

[0038] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0039] This invention provides a vehicle dual-redundant power supply control system based on photovoltaic power generation. The main purpose of this system is to use photovoltaic power generation to achieve charging and maintenance of lithium batteries in special vehicles under silent operation conditions, while improving the charging safety of lithium batteries. Therefore, this system can achieve energy replenishment of lithium batteries and ensure the power supply capability of the vehicle during driving by cooperating with on-board photovoltaic battery modules and power generation system.

[0040] In this embodiment, a vehicle dual-redundancy power supply control system based on photovoltaic power generation is described in the attached figure. Figure 1As shown, it includes: a photovoltaic power generation system, 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 above, this system mainly achieves dual redundant power supply and charging circuits for special vehicles by adding a photovoltaic power generation system.

[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 circuit of the lithium battery and the vehicle power generation system is controlled by the main switch contactor. 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] A photovoltaic power generation system utilizes the photoelectric effect to convert solar energy into electrical energy, providing a partial source of power for the system.

[0043] The bidirectional power converter's main functions include voltage boosting and current control on both sides, with both sides capable of constant current or constant voltage operation. Based on the lithium battery's state of charge (SOC), the bidirectional power converter adjusts the lithium battery-side voltage and output current, while simultaneously connecting and disconnecting the positive and negative contactors of the photovoltaic module's circuit.

[0044] Lithium battery packs, as on-board energy storage power sources, enable bidirectional power transmission;

[0045] The onboard power generation system serves as the vehicle's power source during startup.

[0046] The control module sends control signals to the bidirectional power conversion device, the on-board power generation system, and the engine controller based on the remaining power and temperature of the lithium battery pack.

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

[0048] The engine controller controls the engine's operation and collects its operating parameters to control its running status.

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

[0050] Photovoltaic circuit positive contactor: controls the connection between the positive terminal of the vehicle-mounted photovoltaic power generation module and the positive terminal of the bidirectional power conversion device;

[0051] Photovoltaic circuit negative contactor: controls the connection between the negative terminal of the vehicle-mounted photovoltaic power generation module and the negative terminal of the bidirectional power conversion device;

[0052] The positive terminal of the vehicle-mounted photovoltaic power generation module is connected to the bidirectional power conversion device through a photovoltaic circuit positive contactor, and the negative terminal of the vehicle-mounted photovoltaic power generation module is connected to the bidirectional power conversion device through a photovoltaic circuit negative contactor. The bidirectional power conversion device controls the on / off state of the photovoltaic circuit positive contactor and the photovoltaic circuit negative contactor.

[0053] The on-board power generation system includes: 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] The various systems are mainly connected through system cables, which include transmission cables, system control cables, and bus communication cables.

[0056] The main control component is the control module, which can be directly operated by the vehicle's central control system and can communicate with almost all vehicle components. The control module sends control commands, specifically including the following:

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

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

[0059] If the remaining charge of the lithium battery pack is ≤80% and the temperature of the lithium battery pack is ≤45℃, the bidirectional power converter will operate under constant current conditions, with a maximum charging current ≤1.5C and a maximum voltage of ≤33V.

[0060] If the remaining charge of the lithium battery pack is ≤80% and the temperature of the lithium battery pack is 45℃ < ≤60℃, then the bidirectional power converter is controlled to operate under constant current conditions, with a maximum charging current ≤0.5C and a maximum voltage of ≤33V.

[0061] If the remaining charge of the lithium battery pack is ≤80% and the temperature of the lithium battery pack is >60℃, 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 charge of the lithium battery pack ≤ 90%, the temperature of the lithium battery pack ≤ 45℃, the bidirectional power converter is controlled to operate under constant current conditions, with a maximum charging current ≤ 1C and a maximum voltage of ≤ 33V.

[0063] If 80% < remaining charge of the lithium battery pack ≤ 90%, and 45℃ < lithium battery pack temperature ≤ 60℃, the bidirectional power converter should be controlled to operate under constant current conditions, with a maximum charging current ≤ 0.5C and a maximum voltage of ≤ 33V.

[0064] If 80% < the remaining charge of the lithium battery pack ≤ 90%, and 60℃ < the temperature of the lithium battery pack, then the bidirectional power conversion device will stop working and the positive and negative contactors of the photovoltaic circuit will be turned off.

[0065] If 90% < the remaining charge of the lithium battery pack ≤ 95%, the temperature of the lithium battery pack < 60℃, the bidirectional power converter is controlled to operate under constant current conditions, with a maximum charging current ≤ 0.5C and a maximum voltage of ≤ 33V.

[0066] If 80% < remaining charge of the lithium battery pack ≤ 90%, and 60℃ ≤ lithium battery pack temperature, then the bidirectional power conversion device will stop working and the positive and negative contactors of the photovoltaic circuit will be turned off.

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

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

[0069] Simultaneously close the positive contactor, negative contactor, and main switch contactor of the vehicle-mounted photovoltaic module, setting the bidirectional power conversion device to operate at a constant voltage of 28V.

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

Claims

1. A vehicle dual-redundancy power supply control system based on photovoltaic power generation, characterized in that, include: Photovoltaic power generation systems, bidirectional power conversion devices, main switch contactors, lithium battery packs, vehicle-mounted power generation systems, control modules, engines and engine controllers; 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 circuit of the lithium battery and the vehicle power generation system is controlled by the main switch contactor. 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. A photovoltaic power generation system generates electricity from photovoltaic power, providing a portion of the system's power source. A bidirectional power converter that controls the voltage and current on both sides of the converter. Lithium-ion battery packs serve as on-board energy storage power sources, enabling bidirectional power transmission. The on-board power generation system serves as the vehicle's power source during startup. The control module sends control signals to the bidirectional power conversion device, the on-board power generation system, and the engine controller based on the remaining power and temperature of the lithium battery pack. Engine, the power source of a vehicle; Engine controller, which controls the operating status of the engine; The photovoltaic power generation system includes: vehicle-mounted photovoltaic power generation components, a photovoltaic circuit positive contactor, and a photovoltaic circuit negative contactor; The positive terminal of the vehicle-mounted photovoltaic power generation module is connected to the bidirectional power conversion device through a photovoltaic circuit positive contactor, and the negative terminal of the vehicle-mounted photovoltaic power generation module is connected to the bidirectional power conversion device through a photovoltaic circuit negative contactor. The bidirectional power conversion device controls the on / off state of the photovoltaic circuit positive contactor and the photovoltaic circuit negative contactor. The control module sends control signals, specifically including the following: (i) When setting the vehicle to lithium battery pack charging mode, perform the following settings: (1) If the engine speed of the vehicle does not exceed 50 rpm, close the positive contactor and negative contactor of the vehicle photovoltaic module and open the main switch contactor. If the remaining charge of the lithium battery pack is ≤80% and the temperature of the lithium battery pack is ≤45℃, the bidirectional power converter will operate under constant current conditions, with a maximum charging current ≤1.5C and a maximum voltage of ≤33V. If the remaining charge of the lithium battery pack is ≤80% and the temperature of the lithium battery pack is 45℃ < ≤60℃, then the bidirectional power converter is controlled to operate under constant current conditions, with a maximum charging current ≤0.5C and a maximum voltage of ≤33V. If the remaining charge of the lithium battery pack is ≤80% and the temperature of the lithium battery pack is >60℃, the bidirectional power conversion device will stop working and the positive contactor and negative contactor of the photovoltaic circuit will be disconnected. If 80% < remaining charge of the lithium battery pack ≤ 90%, the temperature of the lithium battery pack ≤ 45℃, the bidirectional power converter is controlled to operate under constant current conditions, with a maximum charging current ≤ 1C and a maximum voltage of ≤ 33V. If 80% < remaining charge of the lithium battery pack ≤ 90%, and 45℃ < lithium battery pack temperature ≤ 60℃, the bidirectional power converter should be controlled to operate under constant current conditions, with a maximum charging current ≤ 0.5C and a maximum voltage of ≤ 33V. If 80% < the remaining charge of the lithium battery pack ≤ 90%, and 60℃ < the temperature of the lithium battery pack, then the bidirectional power conversion device will stop working and the bidirectional power conversion device will shut off the positive contactor and negative contactor of the photovoltaic circuit. If 90% < the remaining charge of the lithium battery pack ≤ 95%, the temperature of the lithium battery pack < 60℃, the bidirectional power converter is controlled to operate under constant current conditions, with a maximum charging current ≤ 0.5C and a maximum voltage of ≤ 33V. If 80% < remaining charge of the lithium battery pack ≤ 90%, and 60℃ ≤ lithium battery pack temperature, then the bidirectional power conversion device will stop working and the bidirectional power conversion device will shut off the positive contactor and negative contactor of the photovoltaic circuit. (2) If the engine speed of the vehicle is not less than 1200 rpm, disconnect the positive contactor and negative contactor of the vehicle 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 settings: Simultaneously close the positive contactor, negative contactor, and main switch contactor of the vehicle-mounted photovoltaic module, setting the bidirectional power conversion device to operate at a constant voltage of 28V.

2. The system as described in claim 1, characterized in that, The on-board power generation system includes: 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.

3. The system as described in claim 1, characterized in that, The first speed range is 1600rpm-3500rpm, and the second speed range is 1200rpm-1599rpm.

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