Power supply system of fuel-powered vehicles

Abstract

A power supply system for a gasoline-powered vehicle includes a control module, a battery management system electrically connected to the control module, a bidirectional DC-DC converter, a main battery module, and an auxiliary battery module electrically connected to the battery management system and the bidirectional DC-DC converter. The main battery module is a power battery. The auxiliary battery module is an energy storage battery. Based on a vehicle status received from a vehicle computer, the control module instructs the battery management system to control the main battery module to supply power to start the engine when the engine needs to be started. The control module also generates a control signal to control the bidirectional DC-DC converter to charge the main battery module from the auxiliary battery module, ensuring that the main battery module has sufficient power to start the engine.

Claims

1. A power supply system for a fuel-powered vehicle, applicable to a fuel-powered vehicle including a vehicle computer, and comprising: a main battery module, which is a power battery; an auxiliary battery module, which is an energy storage battery; and a battery management system (BMS), electrically connected to the main battery module and the auxiliary battery module, and used to monitor the main battery module and the auxiliary battery module. A bidirectional DC-DC converter includes a first terminal electrically connected to the main battery module, a second terminal electrically connected to the auxiliary battery module, and a control terminal. The control terminal is configured to, based on a control signal received by the control terminal, convert the voltage received at the first terminal and output it to the second terminal, or convert the voltage received at the second terminal and output it to the first terminal, or not perform voltage conversion between the first and second terminals. A control module is also included, electrically connected to the battery management system, the bidirectional DC-DC converter, and the vehicle computer of the fuel-powered vehicle. Based on a vehicle status from the vehicle computer, the control signal is generated to determine the voltage conversion relationship between the first and second terminals of the bidirectional DC-DC converter. When the engine needs to be started, the control module notifies the battery management system to control the main battery module to supply power so that the engine can start.

2. The power supply system of a fuel-powered vehicle as described in claim 1, the fuel-powered vehicle further comprising a generator electrically connected to the second terminal of the bidirectional DC-DC converter, wherein, When the control module determines that the fuel vehicle is in motion based on the vehicle status, it generates a control signal based on the output voltage of the main battery module and the state of charge (SOC) of the auxiliary battery module from the battery management system, so that the generator prioritizes charging the auxiliary battery module, or charges the main battery module and the auxiliary battery module together.

3. The power supply system for a fuel-powered vehicle as described in claim 2, wherein, When the control module determines that the charging state of the auxiliary battery module is less than an upper limit threshold, it generates the control signal to control the first terminal and the second terminal of the bidirectional DC-DC converter to not perform voltage conversion, so that the generator prioritizes charging the auxiliary battery module.

4. The power supply system for a fuel-powered vehicle as described in claim 2, wherein, When the control module determines that the charging state of the auxiliary battery module is greater than or equal to an upper limit threshold, or the output voltage of the main battery module is less than a lower limit threshold, it generates the control signal to control the bidirectional DC-DC converter to convert the voltage received at the second terminal and output it to the first terminal, so that the generator charges the main battery module and the auxiliary battery module together.

5. The power supply system for a fuel-powered vehicle as described in claim 3 or 4, wherein, This upper limit threshold is equal to 100%.

6. The power supply system for a fuel-powered vehicle as described in claim 1, wherein, When the control module determines that the fuel vehicle is in a pre-start state based on the vehicle status, it determines whether to perform pre-charging of at least one cell based on the cell parameters of the main battery module from the battery management system. When the control module determines that no pre-charging is required for any of the cells, it sends a start-permit signal to the vehicle computer, so that the vehicle computer can start the engine when it receives a start signal.

7. The power supply system for a fuel-powered vehicle as described in claim 6, wherein, When the control module determines that at least one battery cell needs pre-charging, and further determines that the charging state of the auxiliary battery module is greater than a first lower threshold, it generates a control signal to control the bidirectional DC-DC converter to convert the voltage received at the second terminal and output it to the first terminal, so that the auxiliary battery module charges the main battery module until a preset condition is met. Only then does the control module send the start-up permission signal to the vehicle computer. The preset condition is that the charging state of the auxiliary battery module is greater than a second lower threshold, or a predetermined time length, wherein the second lower threshold is less than the first lower threshold.

8. The power supply system for a fuel-powered vehicle as described in claim 1, wherein, When the control module determines that the fuel vehicle is in a state of being turned off and idle based on the vehicle status, it notifies the battery management system to perform battery balancing management on the multiple cells of the main battery module.

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