TWI769477B - Driving porwer generation system of multi-voltage energy storage device - Google Patents

Abstract

The present invention relates to a driving power generation system of a multi-voltage energy storage device, which includes a low-voltage energy storage device, a high-voltage energy storage device, a driving power generation device and an integrated starter generator. The high-voltage energy storage device is connected in series with the voltage conversion device, and the low-voltage energy storage device is connected in parallel. The driving power generation device has a three-phase six-arm control circuit, which is connected in series with the low-voltage energy storage device. The integrated starter generator is connected to a crankshaft of the engine, and is connected in series with the drive power generation devices. Wherein, the driving power generation system of the present invention has multiple operation modes, so as to provide the functions of vehicle engine starting, energy recharging and driving assistance.

Description

Drive power generation system of multi-voltage energy storage device

The present invention relates to a drive and power generation system of a multi-voltage energy storage device, in particular to a drive and power generation system of a multi-voltage energy storage device suitable for vehicles.

Currently known vehicles with integrated starter generator system usually use a 12V voltage system as the engine starting crankshaft and generator. Because the 12V voltage system is used in the driving state, the speed of the integrated starter generator is proportional to the back EMF voltage. , the higher the driving speed, the more difficult it is to input the phase current, and it is impossible to drive the integrated starter generator to a high speed and maintain sufficient driving torque.

Therefore, in the past, a high-voltage battery was often used to provide power for driving. For example, a 48V lithium battery with high voltage can drive the integrated starter-generator to a higher speed in driving mode and still maintain torque, so it can be used as a vehicle during driving. Use in assist. However, it also has its shortcomings. If only the 48V (or high-voltage battery) system is used as the drive and booster, when the vehicle is left for a long time or the high-voltage battery fails, the vehicle may not be able to restart or drive.

Because of this, the inventor, in the spirit of active invention, urgently thought of a driving and power generation system for a multi-voltage energy storage device that can solve the above problems, and finally completed the present invention after several research experiments.

The main purpose of the present invention is to provide a drive and power generation system for a multi-voltage energy storage device. With the arrangement of a low-voltage energy storage device and a high-voltage energy storage device, energy is generated through a three-phase six-arm control circuit in the drive power generation device. Switching and adjusting the voltage through the voltage conversion device can construct a variety of operating modes to provide the functions of engine starting, energy recharging and driving assistance under different conditions of the vehicle.

In order to achieve the above object, the drive and power generation system of the multi-voltage energy storage device of the present invention is provided on a vehicle with an engine, and includes a low-voltage energy storage device, a high-voltage energy storage device, a drive and power generation device, and a Integrated starter generator. The high-voltage energy storage device is connected with a voltage conversion device in series, and the low-voltage energy storage device is connected in parallel; the driving power generation device has a three-phase six-arm control circuit, which is connected in series with the low-voltage energy storage device; the integrated starter generator is connected with a crankshaft of the engine, Drive the generator in series.

Among them, the drive power generation system has multiple operation modes, so as to provide the functions of engine starting, energy recharging and driving assistance of the vehicle. Thereby, the drive and power generation system of the multi-voltage energy storage device of the present invention will have higher flexibility in the use of energy, which is different from the conventional technology where only one high-voltage battery is added for auxiliary driving and boosting. When the vehicle is left for a long time or the high-voltage battery fails, there may be a risk that the vehicle can no longer be started or driven. Therefore, it is one of the key points of the present invention to properly recycle and utilize energy.

The above-mentioned drive and power generation system may further include a protection unit disposed between the low-voltage energy storage device and the drive and power generation device. Wherein, the protection unit may include a diode and a parallel switch connected in parallel with the diode. In this way, through the setting of the protection unit, the low-voltage energy storage device can be protected from being charged by an excessively high voltage. When the power generation voltage has been adjusted to an appropriate voltage that can charge the low-voltage energy storage device, the parallel switch can be turned on , to perform the charging operation.

The above drive and power generation system may have a high-voltage first engine start mode. In the high-voltage first engine start mode, the parallel switch is not turned on, and energy is provided by the high-voltage energy storage device. The device enables the integrated starter generator to start the engine with high power.

The above-mentioned driving and power generation system may have a high-voltage first boosting mode. In the high-voltage first boosting mode, the parallel switch is not turned on, and the energy is provided by the high-voltage energy storage device. The integrated starter generator drives the booster engine with high power.

The above drive and power generation system can have a high-voltage charging mode. In the high-voltage charging mode, the parallel switch is not turned on, and the engine drives the integrated starter-generator to rotate to provide energy, which is converted into voltage transmission by the drive power generation device, and the voltage is adjusted by the voltage conversion device. , to charge the high-voltage energy storage device.

The above-mentioned drive and power generation system may have a low-voltage charging mode. In the low-voltage charging mode, the parallel switch is turned on, and the engine drives the integrated starter-generator to rotate to provide energy, which is converted into voltage transmission by the drive and power generation device, and the low-voltage energy storage device is carried out. Charge.

The above drive and power generation system may have a low voltage engine start mode. In the low voltage engine start mode, the low voltage energy storage device provides energy to the drive power generation device to enable the integrated starter generator to start the engine with low power.

The above-mentioned drive and power generation system may have a high-voltage second engine start-up mode. In the high-voltage second engine start-up mode, the parallel switch is not turned on, and the high-voltage energy storage device provides energy, the voltage conversion device does not operate, and is provided to the drive and power generation device. The integrated starter generator starts the engine with high power.

The above-mentioned drive and power generation system has a high-voltage second booster mode. In the high-voltage second booster mode, the parallel switch is not turned on, and the high-voltage energy storage device provides energy, the voltage conversion device does not operate, and is provided to the drive-generator device for integrated startup. The generator drives the booster engine with high power.

Both the above summary and the following detailed description are exemplary in nature and are intended to further illustrate the scope of the present invention. The other objects and advantages of the present invention will be explained in the following descriptions and drawings.

Please refer to FIG. 1 , which is a system structure diagram of a drive and power generation system of a multi-voltage energy storage device according to a preferred embodiment of the present invention. The figure shows a drive and power generation system 1 of a multi-voltage energy storage device, which is arranged on a vehicle with an engine, and includes a low-voltage energy storage device 2, a high-voltage energy storage device 3, a voltage conversion device 4, a Drive the generator 5 and an integrated starter generator 6 .

In this embodiment, the low-voltage energy storage device 2 mounted on the vehicle is a 12V lead-acid battery, the high-voltage energy storage device 3 is connected in series with a voltage conversion device 4, and the low-voltage energy storage device 2 is connected in parallel. It is a 36V energy storage device, but it is not limited to the above values. As long as it has a high voltage and a low voltage energy storage device, it meets the requirements of this case. Both energy storage devices can be used as power supply devices. The energy supply hub of the vehicle. The voltage conversion device 4 is used to perform step-up or step-down action, and can be used to provide a stable voltage input, so that the voltage provided to the driving power generation device 5 will not drop due to the reduction of the power of the high-voltage energy storage device 3; the voltage conversion device 4 When the driving generator 5 outputs the same power, the voltage input to the driving generator 5 can also be increased to reduce the current output by the driving generator 5 to the integrated starter generator 6, where W (loss) = I ² (phase current Under the condition of square times) * R (motor internal resistance and wire resistance), the copper loss will decrease as the current decreases.

The driving and generating device 5 has a three-phase six-arm control circuit, which is connected to the low-voltage energy storage device 2 in series, and can switch between the DC power supply and the AC power supply. The DC power is switched to the AC power through the three-phase six-arm control circuit of the drive generator 5, or the AC power from the integrated starter generator 6 can be switched to the DC power through the three-phase six-arm control circuit of the drive generator 5, using In order to achieve the function of driving or power generation, it is used to provide the functions of engine starting, energy recharging and driving assistance of the vehicle under different conditions.

In addition, the drive power generation system 1 is further provided with a protection unit 7 between the low voltage energy storage device 2 and the drive power generation device 5. In this embodiment, the protection unit 7 includes a diode 71 and a diode connected in parallel Parallel switch 72 of 71. The function of the diode 71 is that if the input voltage of the driving generator 5 is lower than the voltage of the low-voltage energy storage device 2, regardless of whether the parallel switch 72 is turned on or not, the diode 71 will be turned on due to the voltage difference. The conversion device 4 can receive the power of the low-voltage energy storage device 2; and if the driving generator 5 already has a high voltage provided by the voltage conversion device 4, the diode 71 will not conduct due to the reverse voltage difference, The low voltage energy storage device 2 is thus protected from being charged by an excessively high voltage. In addition, the time when the parallel switch 72 is turned on is when the low-voltage energy storage device 2 needs to be charged. At this time, the voltage conversion device 4 does not provide a high voltage to the driving and power-generating device 5, and the power-generating voltage of the driving and power-generating device 5 is adjusted to be suitable for low-voltage energy. When the storage device 2 is charged at an appropriate voltage, the parallel switch 72 can be turned on to charge the low-voltage energy storage device 2 . Furthermore, the low-voltage energy storage device 2 is electrically connected to the vehicle load 8 of the vehicle, and the low-voltage energy storage device 2 can not only start the engine, but also provide vehicle power during the operation of the locomotive, such as supplying the engine control unit (ECU), Use with loads such as front and rear lights.

The drive and power generation system 1 of the present invention has multiple operation modes, including a high-voltage first engine start mode, a high-voltage first booster mode, a high-voltage charging mode, a low-voltage charging mode, a low-voltage engine start mode, and a high-voltage second engine start mode mode and a high-voltage second boost mode.

Please refer to FIG. 2 , which is a schematic diagram of a high-voltage first engine start mode of a driving and power generation system of a multi-voltage energy storage device according to a preferred embodiment of the present invention. In the high-voltage first engine start mode, the parallel switch 72 is not turned on. If the locomotive needs to start the engine, the high-voltage energy storage device 3 will provide energy, and the voltage will be boosted from 36V to 60V through the voltage conversion device 4, and then provided to the drive to generate electricity. The device 5 enables the integrated starter generator 6 to start the engine with high power.

Please refer to FIG. 3 , which is a schematic diagram of a high-voltage first boost mode of a driving and power generation system of a multi-voltage energy storage device according to a preferred embodiment of the present invention. In the high-voltage first boost mode, the parallel switch 72 is not turned on. If the driving needs to accelerate, cruise, etc., the integrated starter-generator 6 needs to be assisted, the high-voltage energy storage device 3 provides energy, and the voltage conversion device 4 provides energy. After boosting from 36V to 60V, it is supplied to the drive generator 5 so that the integrated starter generator 6 drives the booster engine with high power, increases the torque and motor on the engine and crankshaft, and increases the power through the transmission system (not shown). wheel power.

Please refer to FIG. 4 , which is a schematic diagram of a high-voltage charging mode of a driving and power generation system of a multi-voltage energy storage device according to a preferred embodiment of the present invention. In the high-voltage charging mode, the parallel switch 72 is not turned on, and the engine drives the integrated starter-generator 6 to rotate to provide energy only when the high-voltage energy storage device 3 needs to replenish energy during low-load driving, cruise control, idling, or other situations. It is converted into voltage transmission by the driving power generation device 5 , and after the voltage is adjusted by the voltage conversion device 4 , the high-voltage energy storage device 3 is charged. If the idle speed or the rotational speed in a specific state is low, the voltage conversion device 4 can further increase the voltage generated by the driving generator device 5 to an appropriate voltage and then charge the high-voltage energy storage device 3 .

Please refer to FIG. 5 , which is a schematic diagram of a low-voltage charging mode of a driving and power generation system of a multi-voltage energy storage device according to a preferred embodiment of the present invention. In the low-voltage charging mode, the parallel switch 72 is turned on, and the engine drives the integrated starter-generator 6 to rotate to provide energy during low-load driving, cruise control, idling, or other situations when the low-voltage energy storage device 2 needs to replenish energy. The driving power generation device 5 is converted into voltage transmission to charge the low-voltage energy storage device 2 . At this time, the voltage conversion device 4 does not operate, and the power source does not charge the high-voltage energy storage device 3 .

Please refer to FIG. 6 , which is a schematic diagram of a low-voltage engine start mode of a driving and power generation system of a multi-voltage energy storage device according to a preferred embodiment of the present invention. In the low-voltage engine start mode, the parallel switch 72 is turned on. If the locomotive needs to start the engine, but the high-voltage energy storage device 3 is insufficient, the low-voltage energy storage device 2 will provide energy, and provide a voltage of 12V to the drive generator 5. The integrated starter generator 6 starts the engine with low power.

Please refer to FIG. 7 , which is a schematic diagram of a high-voltage second engine start mode of the driving and power generation system of the multi-voltage energy storage device according to a preferred embodiment of the present invention. In the high-voltage second engine start mode, the parallel switch 72 is not turned on. If the locomotive needs to start the engine, the high-voltage energy storage device 3 will provide energy. At this time, the voltage conversion device 4 does not operate, and the original voltage value is still provided to the drive generator. 5 Make the integrated starter generator 6 start the engine with high power.

Please refer to FIG. 8 , which is a schematic diagram of a high-voltage second boosting mode of the drive and power generation system of the multi-voltage energy storage device according to a preferred embodiment of the present invention. In the high-voltage second boost mode, the parallel switch 72 is not turned on. If the integrated starter-generator 6 needs to be boosted for driving conditions such as acceleration, cruising, etc., the high-voltage energy storage device 3 provides energy. At this time, the voltage conversion device 4 No action, still maintain the original voltage value to the drive generator 5, so that the integrated starter generator 6 drives the booster engine with high power, increases the torque and motor on the engine and the crankshaft, and increases the power through the transmission system (not shown). wheel power.

The above-mentioned embodiments are only examples for convenience of description, and the scope of the claims claimed in the present invention should be based on the scope of the patent application, rather than being limited to the above-mentioned embodiments.

1: Drive power generation system 2: Low Voltage Energy Storage Devices 3: High voltage energy storage device 4: Voltage conversion device 5: Drive the generator 6: Integrated starter generator 7: Protection unit 71: Diode 72: Parallel switch 8: Vehicle load

FIG. 1 is a system structure diagram of a drive and power generation system of a multi-voltage energy storage device according to a preferred embodiment of the present invention. FIG. 2 is a schematic diagram of a high-voltage first engine start mode of a driving and power generation system of a multi-voltage energy storage device according to a preferred embodiment of the present invention. FIG. 3 is a schematic diagram of a high-voltage first boosting mode of a driving power generation system of a multi-voltage energy storage device according to a preferred embodiment of the present invention. 4 is a schematic diagram of a high-voltage charging mode of a driving and power generation system of a multi-voltage energy storage device according to a preferred embodiment of the present invention. 5 is a schematic diagram of a low-voltage charging mode of a driving and power generation system of a multi-voltage energy storage device according to a preferred embodiment of the present invention. FIG. 6 is a schematic diagram of a low-voltage engine start mode of a driving and power generation system of a multi-voltage energy storage device according to a preferred embodiment of the present invention. 7 is a schematic diagram of a high-voltage second engine start mode of the driving and power generation system of the multi-voltage energy storage device according to a preferred embodiment of the present invention. FIG. 8 is a schematic diagram of a high-voltage second boost mode of the driving and power generation system of the multi-voltage energy storage device according to a preferred embodiment of the present invention.

1: Drive power generation system

2: Low Voltage Energy Storage Devices

3: High voltage energy storage device

4: Voltage conversion device

5: Drive the generator

6: Integrated starter generator

7: Protection unit

71: Diode

72: Parallel switch

8: Vehicle load

Claims (9)

A drive and power generation system of a multi-voltage energy storage device is installed on a vehicle with an engine, comprising: a low-voltage energy storage device; a high-voltage energy storage device, a voltage conversion device connected in series, and the low-voltage energy storage device connected in parallel an energy storage device; a drive power generation device with a three-phase six-arm control circuit, connected in series with the low-voltage energy storage device; an integrated starter generator, connected with a crankshaft of the engine, and connected in series with the drive power generation device; and A protection unit is arranged between the low-voltage energy storage device and the drive and power generation device; wherein, the drive and power generation system has multiple operation modes, so as to provide the functions of engine starting, energy recharging and driving assist of the vehicle. The drive and power generation system for a multi-voltage energy storage device as claimed in claim 1, wherein the protection unit comprises a diode and a parallel switch connected in parallel with the diode. The drive and power generation system for a multi-voltage energy storage device as claimed in claim 2, wherein the drive power generation system has a high-voltage first engine start mode, the parallel switch is turned off in the high-voltage first engine start mode, and The energy is provided by the high-voltage energy storage device, and after being boosted by the voltage conversion device, the energy is supplied to the drive-generator device so that the integrated starter-generator can start the engine with high power. The drive and power generation system for a multi-voltage energy storage device as claimed in claim 2, wherein the drive power generation system has a high-voltage first boost mode, in which the parallel switch is turned off, and the parallel switch is turned off by the high-voltage first boost mode. The high-voltage energy storage device provides energy, and after being boosted by the voltage conversion device, the energy is supplied to the drive-generator device so that the integrated starter-generator can drive and assist the engine with high power. The drive and power generation system for a multi-voltage energy storage device according to claim 2, wherein the drive and power generation system has a high-voltage charging mode, and in the high-voltage charging mode, the parallel switch is turned off, The engine drives the integrated starter-generator to rotate to provide energy, and is converted into voltage transmission by the drive and generator device, and the high-voltage energy storage device is charged after the voltage is adjusted by the voltage conversion device. The drive and power generation system for a multi-voltage energy storage device according to claim 2, wherein the drive and power generation system has a low-voltage charging mode, and in the low-voltage charging mode, the parallel switch is turned on, and the engine drives the integrated starter generator The rotation of the motor provides energy, which is converted into voltage delivery by the drive generator to charge the low voltage energy storage device. The drive and power generation system for a multi-voltage energy storage device according to claim 2, wherein the drive and power generation system has a low-voltage engine start mode, and in the low-voltage engine start mode, energy is provided by the low-voltage energy storage device, Supplied to the drive-generating device enables the integrated starter generator to start the engine with low power. The drive and power generation system for a multi-voltage energy storage device as claimed in claim 2, wherein the drive power generation system has a high-voltage second engine start-up mode, and in the high-voltage second engine start-up mode, the parallel switch is turned off, and Energy is provided by the high-voltage energy storage device, and the voltage conversion device does not operate, and is provided to the drive-generator device to enable the integrated starter-generator to start the engine with high power. The drive and power generation system for a multi-voltage energy storage device as claimed in claim 2, wherein the drive power generation system has a high-voltage second boost mode, and in the high-voltage second boost mode, the parallel switch is turned off, and the The high-voltage energy storage device provides energy, and the voltage conversion device does not operate, and is provided to the driving and generating device to enable the integrated starter-generator to drive and assist the engine with high power.

Images