阅读说明：本技术 增程式车辆的供电系统及其控制方法 (Power supply system of extended range vehicle and control method thereof ) 是由 孙增光 于 2019-11-27 设计创作，主要内容包括：本发明公开了一种增程式车辆的供电系统及其控制方法,系统包括：高压供电装置、低压供电装置和双向逆变器。将双向逆变器的一端连接高压供电装置,另一端连接低压供电装置,仅通过双向逆变器就可以实现在低压供电装置的电压过低时,高压供电装置的电压可以供给至低压供电装置；而当高压供电装置的电压过低时,低压供电装置的电压可以供给至高压供电装置。高压供电装置的多余的电能通过双向逆变器存至低压供电装置中,并在高压供电装置故障的情况下供给至高压供电装置,由此,解决了因动力电池包发生故障,与高压供电装置断开,从而造成的电压波动,及高压负载无法正常工作的问题。(The invention discloses a power supply system of a range-extended vehicle and a control method thereof, wherein the system comprises: the system comprises a high-voltage power supply device, a low-voltage power supply device and a bidirectional inverter. One end of the bidirectional inverter is connected with the high-voltage power supply device, the other end of the bidirectional inverter is connected with the low-voltage power supply device, and the voltage of the high-voltage power supply device can be supplied to the low-voltage power supply device only by the bidirectional inverter when the voltage of the low-voltage power supply device is too low; when the voltage of the high-voltage power supply device is too low, the voltage of the low-voltage power supply device can be supplied to the high-voltage power supply device. Redundant electric energy of the high-voltage power supply device is stored in the low-voltage power supply device through the bidirectional inverter and is supplied to the high-voltage power supply device under the condition that the high-voltage power supply device fails, so that the problems of voltage fluctuation and incapability of normal work of a high-voltage load caused by the fact that the power battery pack breaks down and is disconnected from the high-voltage power supply device are solved.)

1. A power supply system for an extended range vehicle, comprising:

the high-voltage power supply device is connected with the high-voltage load to provide electric energy for the high-voltage load;

the low-voltage power supply device is connected with a low-voltage load to provide electric energy for the low-voltage load;

the bidirectional inverter is connected with the high-voltage power supply device at one end and the low-voltage power supply device at the other end, and controls the electric energy generated by the high-voltage power supply device to flow to the low-voltage power supply device so as to increase the voltage of the low-voltage power supply device; and/or the presence of a gas in the gas,

and controlling the electric energy generated by the low-voltage power supply device to flow to the high-voltage power supply device so as to increase the voltage of the high-voltage power supply device.

2. The power supply system of the extended range vehicle of claim 1, wherein the high voltage power supply comprises a range extender and a power battery pack, and the range extender is connected in parallel with the power battery pack.

3. The power supply system of the extended range vehicle of claim 2, wherein the bidirectional inverter stops controlling the flow of the electric power generated by the low-voltage power supply device to the high-voltage power supply device when the voltage of the low-voltage power supply device is lower than a first threshold;

when the voltage of the low-voltage power supply device is higher than a second threshold value, the bidirectional inverter stops controlling the electric energy generated by the high-voltage power supply device to flow to the low-voltage power supply device.

4. The power supply system of the extended range vehicle of claim 3, wherein the first threshold ranges from 10V to 12V; the second threshold value ranges from 14V to 16V.

5. The power supply system of an extended range vehicle of claim 4, wherein the low voltage power supply is a battery.

6. A control method of a range-extended vehicle power supply system is characterized in that the range-extended vehicle power supply system comprises a bidirectional inverter; the method comprises the following steps:

judging whether a power battery pack of a high-voltage power supply device of the extended range vehicle power supply system breaks down or not;

if so, the bidirectional inverter controls the electric energy generated by a low-voltage power supply device in the extended range type vehicle power supply system to flow to the high-voltage power supply device and maintains a first target voltage of the high-voltage power supply device;

if not, the bidirectional inverter controls the electric energy generated by a high-voltage power supply device in the extended range type vehicle power supply system to flow to the low-voltage power supply device, and maintains a second target voltage of the low-voltage power supply device.

7. The control method of the extended range vehicle power supply system according to claim 6, wherein the first target voltage ranges from 340V to 360V, and the second target voltage ranges from 10V to 16V.

8. The control method of the extended range vehicle power supply system according to claim 7, wherein the bidirectional inverter stops controlling the flow of the electric power generated by the low-voltage power supply device to the high-voltage power supply device when the voltage value of the low-voltage power supply device is outside the range of the second target voltage value; and/or the presence of a gas in the gas,

and stopping controlling the electric energy generated by the high-voltage power supply device to flow to the low-voltage power supply device.

9. The control method of the extended range vehicle power supply system according to claim 8, wherein the maintaining the first target voltage of the high-voltage power supply device includes:

maintaining the first target voltage of the high voltage power supply device by controlling the output power of a range extender of the high voltage power supply device;

and the maintaining of the first target voltage of the high-voltage power supply device by controlling the output power of the range extender of the high-voltage power supply device is divided into a first stage and a second stage.

10. The control method of the extended range vehicle power supply system of claim 9, wherein the extended range vehicle power supply system further comprises a vehicle control unit;

the control method of the first stage comprises the following steps:

the vehicle control unit sets the current of the power battery pack to be zero;

calculating the power of the power battery pack according to the actual current reference value of the power battery pack and the voltage value of the power battery pack;

adding the power of the power battery pack and the required power of a driving motor of the range-extended vehicle to obtain the output power of the range extender;

the control method of the second stage comprises the following steps:

the vehicle control unit sets the voltage of the high-voltage power supply device as a first target voltage;

calculating a reference voltage value according to the difference value of the first target voltage and the bus voltage of the power battery pack, and calculating the power of the power battery pack according to the reference voltage value and the actual current of the power battery pack;

and adding the power of the power battery pack and the required power of a driving motor of the range extender vehicle to obtain the output power of the range extender.

Technical Field

The invention relates to the technical field of automobiles, in particular to a power supply system of a range-extended vehicle and a control method thereof.

Background

The existing vehicle mainly adopts two schemes during steering and braking, wherein the first scheme is that the vehicle is steered and braked by a mechanical structure, and the second scheme is that the vehicle is braked and steered by the difference of driving torques of distributed driving motors on all wheels. We refer to a vehicle employing the second method of braking and steering as an extended range vehicle.

The range-extending vehicle mainly refers to a vehicle adopting a range extender, the range extender specifically refers to an engine and a generator, the engine drives the generator to generate electricity, and the engine does not directly drive wheels. The driving force of the wheels comes from the driving motor. The electric energy for driving the motor comes from the generator and the power battery pack. The electric energy provided by the generator can provide electric energy for the driving motor and can also charge the power battery pack.

When the power battery pack breaks down, the power generation system works normally. In this case, the power generation system is driven by the engine to generate power and separately provide electric energy for driving the motor to drive the vehicle. Because the power response speed of the generator system is far lower than that of the driving motor and the electric energy of the driving motor is provided, the problems that the power battery pack is damaged and the electric energy cannot be supplied in time can occur. This will also result in the voltage on the high voltage power supply (connecting power battery, driving motor and other high voltage loads) will not be maintained normally, the driving motor will not work normally, will influence the vehicle to turn to, under some operating conditions, will produce serious safety consequence.

Therefore, it is necessary to provide a power supply system capable of stabilizing the voltage of the high-voltage power supply device when the power battery pack fails.

Disclosure of Invention

The invention aims to solve the problem that the voltage of a high-voltage power supply device is unstable when a power battery pack in the prior art breaks down. The invention provides a power supply system of an extended range vehicle, which can be used for stabilizing the voltage of a high-voltage power supply device when a power battery pack fails.

To solve the above technical problem, an embodiment of the present invention discloses a power supply system for a range-extended vehicle, including:

the high-voltage power supply device is connected with the high-voltage load to provide electric energy for the high-voltage load;

the low-voltage power supply device is connected with a low-voltage load to provide electric energy for the low-voltage load;

the bidirectional inverter is connected with the high-voltage power supply device at one end and the low-voltage power supply device at the other end, and controls the electric energy generated by the high-voltage power supply device to flow to the low-voltage power supply device so as to increase the voltage of the low-voltage power supply device; and/or the presence of a gas in the gas,

and controlling the electric energy generated by the low-voltage power supply device to flow to the high-voltage power supply device so as to increase the voltage of the high-voltage power supply device.

By adopting the technical scheme, one end of the bidirectional inverter is connected with the high-voltage power supply device, the other end of the bidirectional inverter is connected with the low-voltage power supply device, and the voltage of the high-voltage power supply device can be supplied to the low-voltage power supply device only by the bidirectional inverter when the voltage of the low-voltage power supply device is too low, so that the low-voltage power supply device maintains a normal working state; when the voltage of the high-voltage power supply device is too low, the voltage of the low-voltage power supply device can be supplied to the high-voltage power supply device, so that the high-voltage power supply device can maintain a normal working state.

According to another specific embodiment of the present invention, the power supply system of the extended range vehicle disclosed in the embodiment of the present invention, the high voltage power supply device includes a range extender and a power battery pack, and the range extender is connected in parallel with the power battery pack.

According to another embodiment of the present invention, in the power supply system of the extended range vehicle disclosed in the embodiment of the present invention, when the voltage of the low voltage power supply device is lower than a first threshold, the bidirectional inverter stops controlling the electric energy generated by the low voltage power supply device to flow to the high voltage power supply device;

when the voltage of the low-voltage power supply device is higher than a second threshold value, the bidirectional inverter stops controlling the electric energy generated by the high-voltage power supply device to flow to the low-voltage power supply device.

According to another specific embodiment of the present invention, the power supply system of the extended range vehicle disclosed in the embodiment of the present invention, the first threshold is in a range of 10V to 12V; the second threshold value ranges from 14V to 16V.

According to another embodiment of the present invention, the low-voltage power supply device is a battery.

The embodiment of the invention also discloses a control method of the extended range vehicle power supply system, wherein the extended range vehicle power supply system comprises a bidirectional inverter; the method comprises the following steps:

judging whether a power battery pack of a high-voltage power supply device of the extended range vehicle power supply system breaks down or not;

if so, the bidirectional inverter controls the electric energy generated by a low-voltage power supply device in the extended range type vehicle power supply system to flow to the high-voltage power supply device and maintains a first target voltage of the high-voltage power supply device;

if not, the bidirectional inverter controls the electric energy generated by a high-voltage power supply device in the extended range type vehicle power supply system to flow to the low-voltage power supply device, and maintains a second target voltage of the low-voltage power supply device.

According to another specific embodiment of the invention, the range of the first target voltage is 340V to 360V, and the range of the second target voltage is 10V to 16V.

By adopting the scheme, when the voltage of the low-voltage power supply device is too low, the voltage of the high-voltage power supply device can be supplied to the low-voltage power supply device, so that the low-voltage power supply device maintains a normal working state; when the voltage of the high-voltage power supply device is too low, the voltage of the low-voltage power supply device can be supplied to the high-voltage power supply device, so that the high-voltage power supply device can maintain a normal working state.

According to another embodiment of the present invention, the control method of the extended range vehicle power supply system disclosed in the embodiment of the present invention, when the voltage value of the low voltage power supply device is outside the range of the second target voltage value, the bidirectional inverter stops controlling the electric energy generated by the low voltage power supply device to flow to the high voltage power supply device; and/or the presence of a gas in the gas,

and stopping controlling the electric energy generated by the high-voltage power supply device to flow to the low-voltage power supply device.

By adopting the scheme, the damage caused by the fact that the low-voltage power supply device receives too much electric energy transmitted by the high-voltage power supply device or transmits too much electric energy to the high-voltage power supply device can be prevented.

According to another specific embodiment of the present invention, the method for controlling an extended range vehicle power supply system according to an embodiment of the present invention includes:

maintaining the first target voltage of the high voltage power supply device by controlling the output power of a range extender of the high voltage power supply device;

and the maintaining of the first target voltage of the high-voltage power supply device by controlling the output power of the range extender of the high-voltage power supply device is divided into a first stage and a second stage.

According to another specific embodiment of the invention, the embodiment of the invention discloses a control method of the extended range vehicle power supply system, which further comprises a vehicle control unit;

the control method of the first stage comprises the following steps:

the vehicle control unit sets the current of the power battery pack to be zero;

calculating the power of the power battery pack according to the actual current reference value of the power battery pack and the voltage value of the power battery pack;

adding the power of the power battery pack and the required power of a driving motor of the range-extended vehicle to obtain the output power of the range extender;

the control method of the second stage comprises the following steps:

the vehicle control unit sets the voltage of the high-voltage power supply device as a first target voltage;

calculating a reference voltage value according to the difference value of the first target voltage and the bus voltage of the power battery pack, and calculating the power of the power battery pack according to the reference voltage value and the actual current of the power battery pack;

and adding the power of the power battery pack and the required power of a driving motor of the range extender vehicle to obtain the output power of the range extender.

The invention has the beneficial effects that:

the invention provides a power supply system of an extended range vehicle and a control method thereof.A bidirectional inverter is connected with a high-voltage power supply device at one end and a low-voltage power supply device at the other end, so that when the voltage of the low-voltage power supply device is too low, the voltage of the high-voltage power supply device can be supplied to the low-voltage power supply device only through the bidirectional inverter, and the low-voltage power supply device is kept in a normal working state; when the voltage of the high-voltage power supply device is too low, the voltage of the low-voltage power supply device can be supplied to the high-voltage power supply device, so that the high-voltage power supply device can maintain a normal working state. According to the invention, the redundant electric energy of the high-voltage power supply device is stored in the low-voltage power supply device through the bidirectional inverter, and the part of electric energy can be supplied to the high-voltage power supply device under the condition that the high-voltage power supply device fails, so that the problems that the voltage fluctuation is caused by the fact that the power battery pack breaks down and is disconnected with the high-voltage power supply device, and the high-voltage load cannot normally work are solved.

Drawings

Fig. 1 is a schematic structural diagram of a power supply system of an extended range vehicle according to an embodiment of the present invention;

fig. 2 is an electrical connection diagram of a power supply system of the extended range vehicle according to the embodiment of the invention;

fig. 3 is a flowchart of a control method of the extended range vehicle power supply system according to an embodiment of the present invention;

fig. 4 is a control flowchart of a control method of the extended range vehicle power supply system according to the embodiment of the invention;

fig. 5 is a control flowchart of a first stage of a control method of the extended range vehicle power supply system according to the embodiment of the invention;

FIG. 6 is a control flow chart of a second stage of the control method of the extended range vehicle power supply system according to the embodiment of the present invention;

fig. 7 is a schematic diagram of an overall control method of the extended range vehicle according to the embodiment of the invention.

Description of reference numerals:

1. a high voltage power supply; 2. a high voltage load; 3. a low voltage power supply; 4. a low voltage load; 5. a bidirectional inverter; 6. a range extender; 7. and a power battery pack.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure. While the invention will be described in conjunction with the preferred embodiments, it is not intended that features of the invention be limited to these embodiments. On the contrary, the invention is described in connection with the embodiments for the purpose of covering alternatives or modifications that may be extended based on the claims of the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be practiced without these particulars. Moreover, some of the specific details have been left out of the description in order to avoid obscuring or obscuring the focus of the present invention. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

It should be noted that in this specification, like reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.

In the description of the present embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally placed when the products of the present invention are used, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements indicated must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the present invention.

The terms "first," "second," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the description of the present embodiment, it should be further noted that, unless explicitly stated or limited otherwise, the terms "disposed," "connected," and "connected" are to be interpreted broadly, e.g., as a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present embodiment can be understood in specific cases by those of ordinary skill in the art.

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