KR101363196B1 - System and method for controlling power generation of hybrid vehicle - Google Patents

Abstract

The present invention relates to an inline hybrid vehicle, and more specifically, to a power generation control system which performs optimized control on a power generation system through the control of the engine start of the hybrid vehicle and/or the control of a generator. According to the present invention, the power generation control system optimizes power generation control through the detection of a target power generation amount and a target charging amount through the control of the engine start and/or the control of power generation. [Reference numerals] (AA,CC) No; (BB,DD) Yes; (EE) End; (S500) Power output; (S510) Target power generation amount?; (S520) Target charging amount; (S530) Stop an engine; (S540) Calculate the deviation; (S550) Calculate an engine rotation speed adjustment amount; (S560) Modify the engine rotation speed

Description

System and Method for controlling power generation of hybrid vehicle

The present invention relates to a tandem hybrid vehicle, and more particularly, to a power generation control system for performing optimization control of a power generation system through engine start control and / or control of a generator of a hybrid vehicle.

The present invention also relates to a power generation control method for performing optimization control of a power generation system through engine start control of a hybrid vehicle and / or control of a generator.

Generally, a series hybrid electric vehicle is a vehicle that is developed based on a pure electric vehicle to compensate for the shortcomings of an electric vehicle. It is composed of a power generation device.

In the power generation apparatus, an engine that generates power through combustion of fuel is generally applied, but a gas turbine or a fuel cell is used as a power source.

In-line hybrid electric vehicles use an electric motor for driving, and a voltage for driving the electric motor is supplied through a power generator.

In-line hybrid electric vehicles operate the power generation unit at the optimum operating point in terms of fuel economy / exhaust to increase energy efficiency, and use batteries as energy dampers to cope with rapid start and stop.

In addition, the energy generated by converting the electric motor to the power generation device during deceleration and braking of the vehicle is recovered using the regenerative braking algorithm, and then stored in the battery.

When the energy recovered by the battery is suddenly required due to rapid deceleration or overtaking, when the output of the generator does not satisfy the required power, it compensates for a voltage corresponding to a shortage.

By using this method, it is possible to eliminate the use of sections that reduce fuel consumption and exhaust performance in an existing vehicle, and to use the advantages of an electric vehicle to operate a series hybrid electric vehicle.

The power generating device is an engine that generates power through combustion of fuel, and operates at a high operating point in order to supply electric power to an electric motor as the vehicle is driven. Therefore, engine overheating occurs according to the ambient temperature conditions.

Therefore, the engine control means monitors the temperature of the engine coolant to prevent the engine from overheating.

That is, when the monitored engine coolant reaches a certain temperature, the fuel injection quantity is primarily reduced to reduce the output of the engine. When the coolant temperature drops to a predetermined temperature condition, the fuel injection quantity is restored to its original state.

Even though the fuel injection amount is primarily reduced as described above, when the engine coolant temperature rises, the fuel injection amount is continuously reduced from the secondary temperature condition region so as to lower the engine coolant temperature.

However, in the power generation controller, the torque command output to the power generation device is kept the same in order to continuously obtain the amount of power generation.

Therefore, the engine is gradually outputting a low output due to overheating, but due to the input of the same torque command to the power generation device, different outputs are input, resulting in an overshoot phenomenon in which the RPM is excessively increased.

In addition, the uneven output transmission of the engine and the power generation device causes a problem that the shaft of the power generation device is damaged or the damper plate connecting the power generation device shaft and the engine is damaged, thereby preventing stable driving control.

In addition, there is a problem that the power generation efficiency of the generator is lowered due to these problems.

1. Korean Patent Publication No. 10-2004-0102800 2.Korean Patent Publication No. 10-2004-0002089 3. Japanese Patent Application Laid-Open No. 2009-1213

The present invention has been proposed to solve the problems according to the prior art, and an object thereof is to provide a power generation control system and method for a hybrid vehicle that optimizes power generation control of a generator and thereby provides high efficiency.

Another object of the present invention is to provide stable driving control.

The present invention provides a power generation control system for performing the optimization control of the power generation system through the engine start control of the hybrid vehicle and / or the control of the generator in order to achieve the problem presented above. The power generation control system, the engine; A generator for generating electricity by generating by the engine; A power converter converting the generated power; A battery for charging the converted power or supplying the charged power to the motor; A battery management system (BMS) for analyzing a state of the battery and transmitting a signal for starting the engine; And controlling the engine by receiving the BMS signal, and determining whether to generate power by comparing the rotation speed detected when the engine is started with a preset target value, and comparing the preset target power generation amount with the detected current power generation amount. And a HCU (Hybrid Control Unit) which stops the engine when the target charge amount is met by comparing the detected charge amount with a predetermined target charge amount by detecting the charge amount charged in the battery.

At this time, the HCU, the engine rotational speed detection unit for determining whether the power generation is executed by comparing the rotational speed detected at the engine start with a predetermined target value; A target generation amount calculating unit configured to calculate the target generation amount; A current generation amount detector for calculating the current generation amount; And it may include a target charge amount calculation unit for calculating the target charge amount.

Here, the engine, the engine control unit for controlling the engine; And an engine sensor unit sensing an engine rotation speed.

In addition, the generator, the generator control unit for controlling the generator; And it may be characterized in that it comprises a generator sensor for sensing the amount of power generation.

The HCU may generate warning information when it is determined that there is an error in at least one of the engine, the generator, and the battery.

The power generation control system may further include display means for displaying the generated warning information.

In addition, when the generation amount by the current generation amount detection unit does not reach a target generation amount, the HCU corrects an engine rotation speed target value through a deviation between the current generation amount and a target generation amount, and presets the engine speed based on the modified target value. The engine rotation speed adjustment amount may be calculated to be equal to the target value.

On the other hand, another embodiment of the present invention, receiving a signal from the BMS determining whether or not the normal operation of at least one of the engine, generator, and battery; An engine starting step of starting the engine if it is determined that the operation is normal; A target value comparing step of detecting a rotational speed of the engine after starting the engine and comparing it with a predetermined target value; As a result of the comparison, if the rotational speed and the predetermined target value is the same, the power generation step of generating power to produce power; A power conversion step of converting the generated power by driving the power conversion unit; A target generation amount meeting determination step of detecting a current generation amount after power output and determining whether the detected current generation amount satisfies a target generation amount; A target charge amount meeting determination step of determining whether the current generation amount satisfies a target charge amount when the target generation amount is satisfied; And stopping the engine when the target charging amount is satisfied.

In this case, the determining whether the normal operation may further include displaying the generated warning information on the display means when it is determined that at least one of the engine, the generator and the battery is abnormal.

At this time, the determining whether the normal operation, characterized in that it comprises a step of performing an emergency operation if it is determined that at least one of the engine, generator, and battery is abnormal.

In this case, the determining of the target generation amount meeting step, if the generation amount does not reach the target generation amount, correcting the engine speed target value through the deviation of the current generation amount and the target generation amount; Calculating an engine rotation speed adjustment amount such that the rotation speed of the engine is equal to a predetermined target value based on the modified target value; And controlling the engine rotation speed to be equal to a predetermined target value until the target power generation amount is satisfied through the engine rotation speed adjustment amount.

According to the present invention, power generation control can be optimized through detection of a target power generation amount, target charging amount, etc. through engine start and / or power generation control, thereby achieving high efficiency.

In addition, another effect of the present invention is that stable operation control is possible by stopping generation control, displaying notification information, etc. and maintaining a constant amount of charge of the battery when it is not in a normal operation state.

1 is a block diagram of a power generation control system 100 of a hybrid vehicle according to an exemplary embodiment of the present invention.
2 is a block diagram showing the configuration of the hybrid control unit (HCU) 110 shown in FIG.
3 is a block diagram showing the configuration of the engine control unit 240 and the generator control unit 250 shown in FIG.
4 is a flowchart illustrating a power generation control process of the power generation control system 100 of a hybrid vehicle according to an exemplary embodiment of the present invention.
FIG. 5 is a flowchart illustrating a process of controlling a target power generation amount and / or a charging amount according to FIG. 4.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Like reference numerals are used for similar elements in describing each drawing.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. The term "and / or" includes any combination of a plurality of related listed items or any of a plurality of related listed items.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be construed as ideal or overly formal in meaning unless explicitly defined in the present application Should not.

Hereinafter, a power generation control system and method for a hybrid vehicle according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a power generation control system 100 of a hybrid vehicle according to an exemplary embodiment of the present invention. Referring to FIG. 1, the power generation control system 100 includes an engine 120, a generator 130 driven by the engine 120 to generate electricity to generate power, and a battery 150 by converting the generated power. ) Or a power conversion unit 140 to supply the motor 160, a hybrid control unit (HCU) 110 to control the generator 130 and / or the engine 120, and a BMS to control the battery 150. (Battery Management System) 151 and the like.

In other words, the power generation control system 100 includes an engine 120; A generator 130 generating power by the engine 120; A power converter 140 for converting the generated power; A battery 150 for charging the converted power or supplying the charged power to the motor; A BMS 151 for analyzing a state of the battery 150 and transmitting a signal for starting the engine 120; And controlling the engine 120 by receiving the signal of the BMS 151, comparing the rotation speed detected at the engine start with a predetermined target value to determine whether to generate power, and determining the predetermined target generation amount and the current generation amount detected. Comparing the target power generation amount to meet the detected amount of charge charged to the battery and if the target charge amount is met HCU (110) to stop the engine; and so on.

The HCU 110 functions to control a series hybrid vehicle. In the case of the tandem hybrid vehicle, in addition to the driving mode in which the motor 160 is operated by the power from the generator 130 to move the wheels, only the power of the battery 150 that charges a part of the power from the generator during the driving mode is used. It is also possible to run the motor.

In addition, when it is determined that at least one of the engine 120, the generator 130, and the battery 150 is abnormal, the HCU 110 generates warning information. The generated warning information is displayed via the display means.

As the display means, a display screen (cluster) provided in the vehicle may be used. Of course, it is also possible to configure a separate LED (Light Emitting Diodes), OLED (Organic LED), LCD (Liquid Crystal Display).

The BMS 151 controls the battery 150 and measures and / or discharges the amount of charge of the battery 150 to inform the HCU 110. In addition, the generator 130 transmits information on whether the power generation can start to the HCU (110).

The power converter 140 converts the produced power to supply the battery 150 and / or the motor 160.

In addition, the power converter 140 may include a first power converter (not shown) and a second power converter (not shown) for each of the battery 150 and the motor 160. Accordingly, the first power converter may be connected to the battery 150, and the second power converter may be connected to the motor 160.

2 is a block diagram showing the configuration of the hybrid control unit (HCU) 110 shown in FIG. Referring to FIG. 2, the HCU 110 includes: an engine rotational speed detection unit 210 that determines whether power generation is performed by comparing the rotational speed detected when the engine is started with a preset target value; A target generation amount calculating unit 222 for calculating the target generation amount; A current generation amount detector 221 for calculating the current generation amount; And it may include a target charge amount calculation unit 230 for calculating the target charge amount.

Meanwhile, the current generation amount detector 221 and the target generation amount calculator 222 may be configured as one unit, which becomes the generation amount calculator 220.

The engine rotation speed detection unit 210 is connected to the engine control unit 240 of the engine 120 to receive and / or transmit information.

In addition, the current generation amount detection unit 221 and the target generation amount calculation unit 222 is connected to the generator control unit 250 of the generator 130 to receive and / or transmit information.

The target charge calculator 230 is connected to the BMS 151 to receive and / or transmit information.

Therefore, if the generation amount by the current generation amount detection unit 221 does not reach the target generation amount, the HCU 110 detects the current generation amount and the target generation amount calculation unit 222 detected by the current generation amount detection unit 221. The engine rotation speed target value is corrected through the deviation of the target power generation amount, and the engine rotation speed adjustment amount is calculated so that the rotation speed of the engine 120 is equal to the preset target value based on the modified target value.

3 is a block diagram showing the configuration of the engine control unit 240 and the generator control unit 250 shown in FIG. Referring to FIG. 3, the engine 120 includes an engine controller 240 for controlling the engine 120; And an engine sensor unit 340 for sensing the engine rotation speed and transmitting the sensed engine rotation speed information to the engine controller 240.

In addition, the generator 250, the generator control unit 250 for controlling the generator 250; And a generator sensor unit 350 for sensing the amount of power generated by the generator 250 and transmitting the generated amount information of the generated generator to the generator controller 250.

Of course, in FIG. 3, the engine control unit 240, the engine sensor unit 340, the generator control unit 250, the generator sensor unit 350, and the like may be the engine 120 and the generator 130, respectively, for easy understanding of the present invention. Although described as being configured in, but is not limited thereto, and may be configured as a separate circuit from the engine 120 and the generator 130, respectively.

4 is a flowchart illustrating a power generation control process of the power generation control system 100 of a hybrid vehicle according to an exemplary embodiment of the present invention.

Referring to FIG. 4, the HCU (110 in FIG. 1) receives a signal from the BMS (151 in FIG. 1) of the engine (120 in FIG. 1), the generator (130 in FIG. 1), and the battery (151 in FIG. 1). It is determined whether there is at least one abnormality (steps S400 and S410).

In step S410, when it is determined that all of the engine (120 in FIG. 1), the generator (130 in FIG. 1), and the battery (151 in FIG. 1) are in normal operation, the engine is started (step S420).

In contrast, in step S410, if it is determined that at least one of the engine, the generator, and the battery is abnormal, warning information is generated and displayed on the display means (step S411).

In addition, when it is determined that at least one of the engine, the generator, and the battery is abnormal, the vehicle is driven in the emergency driving mode (step S413).

After the step S420, after the engine is started, the rotational speed of the engine is detected and compared with a predetermined target value (steps S430 and S440).

In step S440, if the rotation speed and the predetermined target value are the same, the power converter (140 in FIG. 1) is operated to produce power (step S460).

Unlike this, in step S440, if the rotation speed and the predetermined target value are not the same, the engine rotation speed is adjusted (step S450). In other words, if the rotational speed is larger than the target value, the rotational speed is decreased, and if the rotational speed is smaller than the target value, the rotational speed is increased and the steps S430 to S450 and S460 are repeated.

FIG. 5 is a flowchart illustrating a process of controlling a target power generation amount and / or a charging amount according to FIG. 4. Referring to FIG. 5, after step S460 of FIG. 4, power is output and the current generation amount is detected after this power output, and it is determined whether the detected current generation amount satisfies the target generation amount (steps S500 and S510).

In step S510, when the target power generation amount is satisfied, it is determined whether the current power generation amount satisfies the target charging amount (step S520).

In step S520, when the target charging amount is satisfied, the engine is stopped (step S530).

On the contrary, if the amount of power generation does not reach the target generation amount in step S510, a deviation between the current generation amount and the target generation amount is calculated (step S540). In other words, the deviation is the current generation minus the target generation.

When the deviation is calculated, the engine rotation speed target value is corrected, and the engine rotation speed adjustment amount is calculated and the engine rotation speed is corrected so that the rotation speed of the engine is equal to the preset target value based on the modified target value (steps S550, S560). ). In other words, if the rotation speed is larger than the target value, the rotation speed is decreased, and if the rotation speed is smaller than the target value, the rotation speed is increased.

Therefore, steps S430 (see FIG. 4) to step S510 are repeatedly performed so that the engine rotation speed is equal to a predetermined target value until the target power generation amount is satisfied through the engine rotation speed adjustment amount.

In particular, the generation control method of the hybrid vehicle according to an embodiment of the present invention may be implemented in the form of program instructions that can be executed by various computer means and recorded in a computer readable medium.

The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination.

The program instructions recorded on the medium may be those specially designed and constructed for the present invention or may be available to those skilled in the art of computer software.

Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like.

The medium may be a transmission medium such as an optical or metal line, a wave guide, or the like, including a carrier wave for transmitting a signal designating a program command, a data structure, or the like.

Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

In addition, one embodiment of the present invention may be implemented in hardware, software, or a combination thereof. (DSP), a programmable logic device (PLD), a field programmable gate array (FPGA), a processor, a controller, a microprocessor, and the like, which are designed to perform the above- , Other electronic units, or a combination thereof.

In a software implementation, it may be implemented as a module that performs the functions described above. The software may be stored in a memory unit and executed by a processor. The memory unit or processor may employ various means well known to those skilled in the art.

As described above, the present invention has been described with reference to particular embodiments, such as specific elements, and specific embodiments and drawings. However, it should be understood that the present invention is not limited to the above- And various modifications and changes may be made thereto by those skilled in the art to which the present invention pertains.

It is therefore to be understood that within the scope of the appended claims all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the appended claims and their equivalents. will be.

The present invention may be implemented in hardware, software, or a combination thereof. (DSP), a programmable logic device (PLD), a field programmable gate array (FPGA), a processor, a controller, a microprocessor, and the like, which are designed to perform the above- , Other electronic units, or a combination thereof. In software implementation, it may be implemented as a module that performs the above-described functions.

The software may be stored in a memory unit and executed by a processor. The memory unit or processor may employ various means well known to those skilled in the art.

100: power generation control system
110: Hybrid Control Unit (HCU)
120: engine
130: generator
140: power conversion unit
150: Battery
151: Battery Management System
160: Motor
210: engine rotation speed detection unit
220: power generation calculation unit
221: current generation amount detection unit
222: target generation amount calculation unit
230: target charge amount calculation unit
240: engine control unit
250: generator control unit
340: engine sensor unit
350: generator sensor

Claims (10)

engine;
A generator for generating electricity by generating by the engine;
A power converter converting the generated power;
A battery for charging the converted power or supplying the charged power to the motor;
A battery management system (BMS) for analyzing a state of the battery and transmitting a signal for starting the engine; And
The engine is controlled by receiving the signal of the BMS, and the engine speed is determined by comparing the rotation speed detected when the engine is started with a predetermined target value, and comparing the predetermined target power generation amount with the detected current power generation amount to determine the target power generation amount. And a HCU (Hybrid Control Unit) which stops the engine when the target charge amount is satisfied by comparing the detected charge amount with a predetermined target charge amount by detecting the charge amount charged in the battery.
The HCU,
An engine rotation speed detection unit which determines whether power generation is performed by comparing the rotation speed detected when the engine starts with a preset target value;
A target generation amount calculating unit configured to calculate the target generation amount;
A current generation amount detector for calculating the current generation amount; And
And a target charging amount calculator configured to calculate the target charging amount.
If the generation amount by the current generation amount detection unit does not reach the target generation amount, the HCU corrects the engine rotation speed target value through the deviation between the current generation amount and the target generation amount, and based on the revised target value, The generation control system of the hybrid vehicle, characterized by calculating the engine rotation speed adjustment amount to be the same.
delete The method of claim 1,
The engine includes an engine control unit for controlling the engine; And an engine sensor for sensing the engine rotational speed,
The generator, the generator control unit for controlling the generator; And a generator sensor unit sensing a power generation amount.
The method of claim 1,
And the HCU generates warning information when it is determined that there is an error in at least one of the engine, the generator, and the battery. 5. The method of claim 4,
And a display means for displaying the generated warning information.
delete A normal operation state determining step of receiving a signal from the BMS and determining whether at least one of the engine, the generator, and the battery is abnormal;
An engine starting step of starting the engine if it is determined that the operation is normal;
A target value comparing step of detecting a rotational speed of the engine after starting the engine and comparing it with a predetermined target value;
As a result of the comparison, if the rotational speed and the predetermined target value is the same, the power generation step of generating power to produce power;
A power conversion step of converting the generated power by driving the power conversion unit;
A target generation amount meeting determination step of detecting a current generation amount after power output and determining whether the detected current generation amount satisfies a target generation amount;
A target charge amount meeting determination step of determining whether the current generation amount satisfies a target charge amount when the target generation amount is satisfied; And
Stopping the engine when the target charge amount is satisfied;
The determination step of meeting the target generation amount,
If the amount of power generation does not reach a target generation amount, correcting an engine speed target value through a deviation between the current generation amount and a target generation amount;
Calculating an engine rotation speed adjustment amount such that the rotation speed of the engine is equal to a predetermined target value based on the modified target value; And
And controlling the engine rotation speed to be equal to a predetermined target value until the target power generation amount is satisfied through the engine rotation speed adjustment amount.
The method of claim 7, wherein
The determining whether the normal operation,
And displaying the generated warning information on the display means when it is determined that there is an abnormality in at least one of the engine, the generator, and the battery.
The method of claim 8,
The determining whether the normal operation,
And performing emergency operation if it is determined that at least one of the engine, the generator, and the battery is abnormal.
delete

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