TWI681889B - Series hybrid power device for vehicle and control method thereof - Google Patents

Abstract

A series hybrid power device for vehicle and a control method thereof are provided. The series hybrid power device has a engine power unit, a motor power unit, a battery unit and a vehicle control unit. The engine power unit has an engine, and a power converter. The motor power unit has a motor and an inverter. The battery unit has a first control loop, a second control loop, and a third control loop. When the power converter is broken, the second control loop is controlled to open, and the first control loop is controlled to close, so that the motor power unit can keep supplying the power to the motor.

Description

Vehicle series hybrid power device and its control method

The invention relates to a hybrid power plant and its control method, in particular to a vehicle series hybrid power plant and its control method.

At present, due to the pressure of energy saving and emission reduction, vehicle energy saving and emission reduction standards are becoming increasingly strict. In order to reduce the energy consumption of vehicles, many new vehicle systems including hybrid vehicles have been developed. Hybrid electric vehicles combine the long-distance travel distance of traditional internal combustion engine vehicles with the advantages of energy saving and environmental protection of electric vehicles, so they have been widely used.

Hybrid electric vehicles can currently be divided into four types: series type, parallel type, hybrid type and compound type, where series type hybrid electric vehicle is a system that supplies power to the drive device (motor) from multiple energy sources to drive the vehicle. . Series hybrid electric vehicles use a motor-driven method, which has more ideal torque/speed control characteristics compared with traditional mechanical transmission methods. Therefore, the drive system of a series-type hybrid electric vehicle generally does not require a multi-speed transmission. Can greatly simplify the transmission system of traditional vehicles and can reduce costs.

The relays of the general series hybrid power system are arranged inside the battery pack. The timing of opening (opening) and closing (closed) of the relay is controlled by the vehicle control unit (VCU) And battery management system (Battery Management System, BMS).

However, the inverter that controls the motor and the power converter that controls the operation of the engine share the same relay at the same time. If the power converter fails during driving, the relay will be turned on, thus causing the inverter Loss of power source, which in turn makes the motor unable to be driven, resulting in the instantaneous loss of power of the entire vehicle and the risk of rear-end collision.

Therefore, it is necessary to provide an improved vehicle series hybrid device to solve the problems in conventional technology.

The main purpose of the present invention is to provide a vehicle series hybrid power device. When the power converter fails, the second relay of the control battery unit can be opened and the first relay of the battery can be controlled to be closed, thereby driving the motor Operate to maintain the operation of the vehicle.

Another main object of the present invention is to provide a control method for a vehicle series hybrid power plant. In the error detection step, when the power converter fails, the second control loop that controls the battery unit is opened, and the first control is controlled The loop is closed, so that the battery source continues to supply power to the motor power unit, thereby improving the reliability of the vehicle.

Specifically, the invention of claim 1 in the patent application scope of the present invention is a vehicle series hybrid device, which includes an engine power unit, a motor power unit, a battery unit and a vehicle Control unit; the engine power unit includes an engine, a starter generator, a power converter and an engine management system, the starter generator is connected to the engine for starting the engine to run and generate electricity, the power converter It is electrically connected to the starter generator, and the engine management system is electrically connected to the engine to control the fuel injection and ignition of the engine; the motor power unit includes a motor and an inverter, wherein the inverter is used to Drive the motor to run; the battery unit includes a battery source, a first control loop, a second control loop, a third control loop and a battery management system, the first control loop is electrically connected to the battery source and the inverter respectively And controlled by the inverter, the second control loop is electrically connected to the battery source and the power converter, respectively, the third control loop is electrically connected to the two ends of the second control loop, the battery management system is used To control the second control loop and the third control loop; the vehicle control unit is electrically connected to the battery management system and the engine management system, respectively.

According to the above configuration of the present invention, when the power converter fails during driving, the second control loop of the battery unit is controlled to be open, but the first control loop controlled by the inverter is still The closed circuit does not trip, so the motor can still be driven to maintain the operation of the vehicle, and avoid vehicle explosion or collision accidents.

In the invention of claim 2 of the present invention, the first control loop has a first relay, and the inverter is used to control the first relay to be open or closed.

According to the above configuration of the present invention, the inverter is used to control the first relay to be open or closed, so that the electrical efficiency of the first control loop can be improved.

In the invention of claim 3 of the present invention, the second control loop has a second relay, and the battery management system is used to control the second relay to be open or closed.

According to the above configuration of the present invention, the battery management system is used to control the second relay to be open or closed, which can improve the electrical performance of the second control loop.

In the invention of claim 4 of the present invention, the third control loop has a third relay and a resistor, and the battery management system is used to control the third relay to be open or closed.

According to the above configuration of the present invention, the battery management system is used to control the third relay to be open or closed, which can improve the electrical performance of the second control loop.

In the invention of claim 5 of the present invention, the battery unit further has a battery box, and the battery source, the first control circuit, the second control circuit, the third control circuit, and the battery management system are all disposed in the battery box .

According to the above configuration of the present invention, by arranging the battery source, the first control loop, the second control loop, the third control loop, and the battery management system in the battery box, collision damage can be prevented and the overall components can be reduced Configuration space.

In the invention of claim 6 of the present invention, the power converter is an alternating current and direct current converter.

According to the above configuration of the present invention, by providing the power converter as an alternating current and direct current converter, a preferred embodiment of the present invention can be provided.

In the invention of claim 7 of the patent application scope of the present invention, the inverter is a half-bridge inverter, a full-bridge inverter or a three-phase bridge inverter.

According to the above configuration of the present invention, by setting the inverter as a half-bridge inverter, a full-bridge inverter, or a three-phase bridge inverter, three preferred embodiments of the present invention can be provided.

In the invention of claim 8 of the present invention, the starter generator is a permanent magnet synchronous generator.

According to the above configuration of the present invention, by setting the starter generator as a permanent magnet synchronous generator, a preferred embodiment of the present invention can be provided.

The invention of claim 9 in the patent application scope of the present invention is a control method of a vehicle series hybrid power plant. The control method of the vehicle series hybrid power plant includes steps Step: a pre-charging step, controlling a third control loop of a battery unit to be closed, so that a battery source of the battery unit is closed via the third control loop to charge a capacitor of a power converter; a charging step , When the voltage at both ends of a second control loop of the battery unit is less than a preset voltage, the second control loop is controlled to be closed, and the third control loop is controlled to be open, so that the power converter can be removed from the battery The source obtains power to drive a starter generator, and drives an engine to run, at which time the power converter obtains power from the starter generator and then recharges it to the battery source; and a debugging step when a power converter fails At this time, the second control loop is controlled to be open, and a first control loop of the battery unit is controlled to be closed, so that the battery source supplies power to a motor power unit.

According to the above configuration of the present invention, when the power converter fails during driving, the second control loop of the battery unit will be controlled to be open, but the first control loop controlled by the inverter is still The closed circuit does not trip, so it can still drive the motor to maintain the operation of the vehicle, and can allow the user to ride to the maintenance station or his own garage for maintenance in this electric mode, thereby avoiding vehicle explosion or collision accidents , And to improve the reliability of vehicle travel.

As mentioned above, when the power converter fails during driving, the second relay of the battery unit will be controlled to open, but the first relay controlled by the inverter is still closed and does not trip, so It can still drive the motor to maintain the operation of the vehicle, and allows the user to ride to the repair station or his own garage for maintenance in this electric mode, thereby avoiding vehicle explosion or collision accidents, and thereby improve the vehicle's driving Reliability.

100‧‧‧Vehicle series hybrid power plant

2‧‧‧Engine power unit

21‧‧‧Engine

22‧‧‧Start generator

23‧‧‧Power converter

24‧‧‧Engine Management System

3‧‧‧Motor power unit

31‧‧‧Motor

32‧‧‧Inverter

4‧‧‧ battery unit

41‧‧‧Battery source

42‧‧‧ First control loop

421‧‧‧ First relay

43‧‧‧Second control loop

431‧‧‧second relay

44‧‧‧The third control loop

441‧‧‧The third relay

442‧‧‧Resistance

45‧‧‧ battery management system

46‧‧‧ battery box

5‧‧‧Vehicle control unit

S201‧‧‧Pre-charging procedure

S202‧‧‧Charging procedure

S203‧‧‧debugging steps

Figure 1 is a schematic diagram of the circuit configuration of a preferred embodiment of the vehicle series hybrid power plant according to the present invention; Figures 2 to 4 are a preferred embodiment of the vehicle series hybrid power plant according to the present invention A schematic diagram of the three operation modes; and FIG. 5 is a flowchart of a preferred embodiment of the control method of the vehicle series hybrid power plant according to the present invention.

In order to make the above and other objects, features, and advantages of the present invention more comprehensible, the preferred embodiments of the present invention will be specifically described below in conjunction with the accompanying drawings, which will be described in detail below. Furthermore, the terms of direction mentioned in the present invention, such as up, down, top, bottom, front, back, left, right, inner, outer, side, surrounding, center, horizontal, horizontal, vertical, longitudinal, axial, The radial direction, the uppermost layer or the lowermost layer, etc., are only the directions referring to the attached drawings. Therefore, the directional terminology is used to illustrate and understand the present invention, not to limit the present invention.

Referring to FIG. 1, a preferred embodiment of the vehicle series hybrid device 100 of the present invention includes an engine power unit 2, a motor power unit 3, and a battery unit 4, And a vehicle control unit 5 (Vehicle Control Unit). The present invention will detail the detailed structure, assembly relationship and operation principle of each element below.

With continued reference to FIG. 1, the engine power unit 2 includes an engine 21 (Engine), a starter generator 22 (Integrated Starter and Generator, ISG), a power converter 23, and an engine management system 24 (Engine Management System , EMS); wherein the starter generator 22 is connected to the engine 21 to start the engine 21 to run and generate electricity; the power converter 23 is electrically connected to the starter generator 22; the engine management system 24 is electrically connected The cited Engine to control the fuel injection and ignition of the engine 21. In the present embodiment, the power converter 23 is an AC/DC converter. In this embodiment, the starter generator 22 is a permanent magnet synchronous generator.

With continued reference to FIG. 1, the motor power unit 3 includes a motor 31 and an inverter 32 (Inverter), wherein the inverter 32 is used to drive the motor 31 to operate. In this embodiment, the inverter 32 may be configured as a half-bridge inverter, a full-bridge inverter, or a three-phase bridge inverter.

With continued reference to FIG. 1, the battery unit 4 includes a battery source 41, a first control loop 42, a second control loop 43, a third control loop 44, and a battery management system 45 (Battery Management System, BMS ) And a battery box 46; the first control circuit 42 is electrically connected to the battery source 41 and the inverter 32, and is controlled by the inverter 32; the second control circuit 43 is electrically connected to the battery source 41, respectively And the power converter 23; the third control loop 44 is electrically connected to the two ends of the second control loop 43; the battery management system 45 is used to control the second control loop 43 and the third control loop 44; The battery source 41, the first control circuit 42, the second control circuit 43, the third control circuit 44 and the battery management system 45 are all disposed in the battery box 46. In this embodiment, the first control loop 42 has a first relay 421, the inverter 32 is used to control the first relay 421 to be open or closed, and the second control loop 43 has a second relay 431 The battery management system 45 is used to control the second relay 431 to be open or closed. In addition, the third control loop 44 has a third relay 441 and a resistor 442. The battery management system 45 is used to control the third relay 441 The circuit is open or closed, and the battery source 41 is a plurality of lithium batteries connected in series.

With continued reference to FIG. 1, the vehicle control unit 5 is electrically connected to the battery management system 45 and the engine management system 24, respectively. In this embodiment, the vehicle control unit 5 is set In the vehicle, it is used to coordinate the work of the engine management system 24, the battery management system 45, the power converter 23, and the inverter 32.

According to the above structure, the first relay 421 is electrically connected to the inverter 32 and the battery source 41, and the second relay 431 is electrically connected to the power converter 23 and the battery source 41 to make the inverter The first relay 421 and the second relay 431 are electrically closed by the first relay 421 and the second relay 431, respectively. As shown in FIG. 2, when operating in an electric mode, the first relay 421 is controlled to be closed. At this time, the battery source 41 will supply power to the motor power unit 3, and then the inverter 32 drives the When the motor 31 is running, if the battery management system 45 detects an error signal, the first relay 421 is controlled to open and enter the system protection mode; as shown in Figure 3, when operating In the motor charging mode, first control the third relay 441 of the third control circuit 44 to be closed, so that the battery source 41 is closed by the third control circuit 44 to pre-charge the power converter 23 when the system power supply is satisfied The pre-charge voltage is set to control the second relay 431 to be closed, so that the starter generator 22 is closed to charge the battery source 41 through the second relay 431, and the third relay 441 is opened, if the When the power converter 23 fails during driving, the second relay 431 is controlled to open; as shown in FIG. 4, when operating in a delayed mode, the pre-charging is the same as the above-mentioned generator charging mode, and the second The relay 431 is closed, so that the starter generator 22 is closed through the second relay 431 to charge the battery source 41, and then the first relay 421 is controlled to be closed, so that the battery source 41 supplies power to the motor power unit 3 In order to operate the engine 21 and the motor 31 in sequence, if the power converter 23 fails, the second relay 431 will be controlled to open, and if the inverter 32 fails, the first relay 421 will be controlled to open. It should be noted that before the second relay 431 is closed, the third relay 441 is controlled to be closed and pre-charged. When a second relay of the second control circuit 43 is When the voltage at both ends of the device 431 is less than a preset voltage, for example, 10% of the voltage of the battery source 41, the second relay 431 is controlled to be closed, and the third relay 441 is controlled to be open.

With the above-mentioned design, when the power converter 23 fails during driving, the second relay 431 of the battery unit 4 will be controlled to open, but the first relay 421 controlled by the inverter 32 still shows The closed circuit does not trip, so it can still drive the motor 31 to maintain the operation of the vehicle, and can allow the user to ride to the repair station or his own garage for maintenance in this electric mode, thus effectively avoiding vehicle bursts Or chase an accident and use it to increase the reliability of the vehicle.

Please refer to FIG. 5 in conjunction with FIG. 1, the preferred embodiment of the control method of the vehicle series hybrid device of the present invention is controlled by the above-mentioned vehicle series hybrid device 100. The control method includes a pre- The charging step S201, a charging step S202, and an error detection step S203.

Continuing to refer to FIG. 5 in conjunction with FIG. 1, in the pre-charging step S201, a third control circuit 44 controlling a battery unit 4 is closed, so that a battery source 41 of the battery unit 4 passes through the third The control circuit 44 is closed and charges a capacitor of a power converter 23.

With continued reference to FIG. 5 and as shown in FIG. 1, in the charging step S202, when the voltage at both ends of a second control loop 43 of the battery unit 4 is less than a preset voltage, the second control loop is controlled 43 is closed, and the third control circuit 44 is controlled to be open, so that the starter generator 22 is closed through the second control circuit 43 to charge the battery source 41.

Continuing to refer to FIG. 5 in conjunction with FIG. 1, in the error detection step S203, when a power converter 23 fails, the second control circuit 43 is controlled to open, and a first battery unit 4 is controlled. A control circuit 42 is closed, so that the battery source 41 supplies power to a motor power unit 3.

It should be noted that the control method of the vehicle series hybrid device of the present invention will be applicable to the three operation modes of the vehicle series hybrid device 100, namely an electric mode, a delayed mode, and a generator charging mode, And switching is performed, wherein the electric mode only drives a motor 31 to operate, the generator charging mode drives an engine 21 to operate, and the extended mode sequentially drives the engine 21 and the motor 31 to operate.

Referring to FIG. 1, when the power of the battery source 41 is higher than 40%, it operates in the electric mode, and an inverter 32 of the motor power unit 3 controls a first of the first control circuit 42 A relay 421 is closed. At this time, the battery source 41 will supply power to the motor power unit 3, and then the inverter 32 drives the motor 31 to run. If a battery management system 45 detects a system error (Error) Signal that controls the first relay 421 to open.

With continued reference to FIG. 1, when the power of the battery source 41 is between 30% and 40%, it operates in the extended mode and sequentially drives the engine 21 and the motor 31, and first controls the third control A third relay 441 of the circuit 44 is closed, so that the battery source 41 is closed through the third control circuit 44 to pre-charge the power converter 23; when a second relay 431 of the second control circuit 43 is When the voltage at the two terminals is less than a preset voltage, for example, 10% of the voltage of the battery source 41, the second relay 431 is controlled to be closed, and the third relay 441 is controlled to be open, so that the starter generator 22 passes through the first The second relay 431 is closed and charges the battery source 41. Next, the first relay 421 is controlled to be closed. At this time, the battery source 41 supplies power to the motor power unit 3, and sequentially detects whether the power converter 23 and the inverter 32 have a system error (Error) .

With continued reference to FIG. 1, in the generator charging mode, first control the third relay 441 to be closed, so that the battery source 41 is closed through the third control circuit 44 to pre-charge the power converter 23; When the voltage at the two terminals of the second relay 431 is less than a preset voltage At this time, for example, 10% of the voltage of the battery source 41, the second relay 431 is controlled to be closed, and the third relay 441 is controlled to be open, so that the starter generator 22 is closed through the second relay 431 to the The battery source 41 is charged, and then if the power converter 23 has a system error, the second relay 431 is controlled to open.

With the above-mentioned design, when the power converter 23 fails during driving, the second relay 431 of the battery unit 4 will be controlled to open, but the first relay 421 controlled by the inverter 32 still shows The closed circuit does not trip, so it can still drive the motor 31 to maintain the operation of the vehicle, and can allow the user to ride to the repair station or his own garage for maintenance in this electric mode, thus effectively avoiding vehicle bursts Or chase an accident and use it to increase the reliability of the vehicle.

Although the present invention has been disclosed in preferred embodiments, it is not intended to limit the present invention. Anyone who is familiar with this skill can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection shall be as defined in the scope of the attached patent application.

100‧‧‧Vehicle series hybrid power plant

2‧‧‧Engine power unit

21‧‧‧Engine

22‧‧‧Start generator

23‧‧‧Power converter

24‧‧‧Engine Management System

3‧‧‧Motor power unit

31‧‧‧Motor

32‧‧‧Inverter

4‧‧‧ battery unit

41‧‧‧Battery source

42‧‧‧ First control loop

421‧‧‧ First relay

43‧‧‧Second control loop

431‧‧‧second relay

44‧‧‧The third control loop

441‧‧‧The third relay

442‧‧‧Resistance

45‧‧‧ battery management system

46‧‧‧ battery box

5‧‧‧Vehicle control unit

Claims (9)

A vehicle serial hybrid device includes: an engine power unit, including: an engine; a starter generator connected to the engine to start the engine to run and generate electricity; a power converter, electrically connected to the Start the generator; and an engine management system, which is electrically connected to the engine to control the fuel injection and ignition of the engine; a motor power unit including a motor and an inverter, wherein the inverter is used to drive the motor Operation; a battery unit, including: a battery source; a first control loop, respectively electrically connected to the battery source and the inverter, and controlled by the inverter; a second control loop, respectively electrically connected to the battery Source and power converter; a third control loop, electrically connected to the two ends of the second control loop; and a battery management system to control the second control loop and the third control loop; and a vehicle The control unit is electrically connected to the battery management system and the engine management system, respectively. According to the vehicle serial hybrid device of claim 1, the first control circuit has a first relay, and the inverter is used to control the first relay to be open or closed. According to the vehicle serial hybrid device of claim 1, the second control circuit has a second relay, and the battery management system is used to control the second relay to be open or closed. According to the vehicle serial hybrid device of claim 2 of the patent application scope, wherein the third control loop has a third relay and a resistor, and the battery management system is used to control the third relay to be open or closed. According to the vehicle serial hybrid device of claim 1, the battery unit further has a battery box, the battery source, the first control loop, the second control loop, the third control loop and the battery management system are all set in The battery box. According to the vehicle serial hybrid device of claim 1, the power converter is an alternating current and direct current converter. According to the vehicle serial hybrid device of item 1 of the patent application scope, the inverter is a half-bridge inverter, a full-bridge inverter or a three-phase bridge inverter. According to the vehicle serial hybrid device of item 1 of the patent application scope, wherein the starter generator is a permanent magnet synchronous generator. A control method of a vehicle series hybrid power plant includes the steps of: a pre-charging step, controlling a third control loop of a battery unit to be closed, so that a battery source of the battery unit is closed via the third control loop A power converter; a charging step, when the voltage at both ends of a second control loop of the battery unit is less than a preset voltage, the second control loop is controlled to be closed, and the third control loop is controlled to be open So that the starter generator is closed through the second control loop to charge the battery source; and In an error detection step, when a power converter fails, the second control loop is controlled to be open, and a first control loop of the battery unit is controlled to be closed, so that the battery source supplies power to a motor power unit.

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