KR101371793B1 - Vehicle power generating system, and control method thereof - Google Patents

Abstract

The present invention relates to a vehicle power generation control system for performing a power generation control of a generator for generating electric power using the rotational force of the engine, the present invention is a battery for receiving and charging the power generated by the generator; A first electric device that is selectively supplied with power generated by the generator and controlled by external control; And when the vehicle is determined to be in a decelerated state, controlling the generator to generate the maximum power, subtracting the maximum charging power of the battery from the power generated by the control of the generator, and calculating surplus power. And an electronic control unit (ECU) for controlling whether power is supplied to the first electric device in response to surplus power. Accordingly, the present invention can effectively utilize the amount of surplus power exceeding the maximum amount of charging power of the battery of the power generated in the regenerative braking interval can improve the fuel economy.

Description

Vehicle power generation control system and its control method {Vehicle power generating system, and control method

The present invention relates to a vehicle power generation control system, and more particularly, to a vehicle power generation control system for improving fuel efficiency by performing power generation control according to the state of the battery and the driving state of the vehicle.

The vehicle power generation control system applied to the vehicle regulates the load of the generator while driving the vehicle to improve fuel efficiency. In other words, the generator load is increased in the deceleration section of the vehicle that consumes less fuel, thereby producing a lot of electric energy, and storing it in a storage device. By reducing the fuel economy can be improved.

That is, the conventional vehicle power generation control system is a generator for charging electricity to the battery by increasing the generator voltage during deceleration driving, that is, regenerative braking, and to limit the power or current to the battery to prevent the battery from being degraded due to excessive charging current. Perform control. As one of these methods, a method of limiting the charging current of the battery by lowering the voltage of the generator may be used.

However, this method of limiting the charging current has a drawback in terms of energy loss because it results in reducing the regenerative braking energy.

KR 10-2010-0063921 A 2010. 06. 14, drawing 1

An object of the present invention is to provide a vehicle power generation control system and its control method that can minimize the energy loss due to the charge current limiting technology of the battery by introducing a configuration in consideration of the utilization of the generated power.

Vehicle power generation control system according to an aspect of the present invention for achieving the above object, the generator for generating power using the rotational force of the engine; A battery that receives and charges power generated by the generator; A first electric device that is selectively supplied with power generated by the generator and controlled by external control; And when the vehicle is determined to be in a decelerated state, controlling the generator to generate the maximum power, subtracting the maximum charging power of the battery from the power generated by the control of the generator, and calculating surplus power. And an electronic control unit (ECU) for controlling whether power is supplied to the first electric device in response to surplus power.

The ECU may control the generator so that the generator generates the maximum power while controlling to supply power to the first electric device when the surplus power amount is greater than the power consumption of the first electric device.

The first electric apparatus is provided in plural, and the ECU selects the first electric apparatuses capable of operating in the range of the surplus electric power based on the power consumption amount according to the selective operation of each of the first electric apparatuses, The generator may be controlled to generate maximum power while controlling to supply power to the selected first electrical devices.

The ECU compares the set values and the surplus power respectively set according to the power consumption according to the selective operation of the first electrical devices, selects a large set value closest to the surplus power among the set values, and selects the selected power. Power may be supplied to the first electric devices according to the amount of power consumption corresponding to the set value.

The ECU may include a table listing first electrical devices according to power consumption corresponding to each of the set values.

The ECU may control to supply power to the first electric devices based on a priority determined by state information of the vehicle input from the outside.

And a second electric device that is constantly supplied with power generated by the generator and operates, wherein the surplus power amount is determined by the second electric device from the amount of power generated by the generator to the maximum charge power of the battery. It can be calculated by subtracting the sum of the electric power amounts.

When it is determined that the vehicle is in a deceleration state, it may be determined that the vehicle speed is decelerating and fuel is cut off, it is determined that the brake is in operation, or that the accelerator pedal is not stepped on.

The first electric device may be provided with at least one of a cooling fan, a blower fan, an electric water pump, an electric air conditioner pump, and a heating wire.

Another aspect of the present invention for achieving the above object relates to a control method of a vehicle power generation control system for generating power generation by the rotational force of the engine to perform a power generation control of a generator for charging a battery, The control method of the system includes determining whether the vehicle is in a decelerated state when the engine is turned on; Calculating a surplus power amount by subtracting the maximum charge power amount of the battery from the power amount generated by the generator when the vehicle is determined to be in a deceleration state; Comparing the calculated set amount of surplus power with a set value set corresponding to the power consumption of the first electric device that is selectively supplied with power generated by the generator by an external control; And controlling the generator to generate the maximum power while controlling the power supply to the first electric device when the surplus power is greater than the set value.

As described above, the present invention improves the durability of the battery by limiting the excess current supplied to the battery by utilizing the surplus power exceeding the maximum charging power of the battery among the power generated in the regenerative braking section to drive the first electric device. At the same time, fuel economy can be improved.

1 is a block diagram of a vehicle power generation control system according to an embodiment of the present invention.
2 is a graph for explaining the effect of the vehicle power generation control system according to an embodiment of the present invention.
3 is a control flowchart of a power generation control system for a vehicle according to an embodiment of the present invention.

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 contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Should not.

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

1 is a block diagram of a vehicle power generation control system according to an embodiment of the present invention. As shown in FIG. 1, the vehicle power generation control system 1 according to the present embodiment includes a generator 10 generating power using a rotational force of an engine and a battery 10 receiving power from the generator 40, The ECU 50 may include a first electric device 20 and a second electric device 30, and perform power generation control in association with the first electric device 20 and the second electric device 30. ECU 30 is an abbreviation of Electronic Control Unit and may perform overall control of the vehicle.

The battery 10 receives power from the generator 40 to charge the battery 10 and transmits battery information such as a state of charge (SOC) and a battery temperature to the ECU 50.

The first electric device 20 is an electric equipment of a vehicle which is selectively supplied with power generated by the generator 40 by an external control. For example, the first electric device 20 is provided with a cooling fan, a blower fan, an electric water pump, an electric air conditioner pump, and a heating wire, and the user's selection or various state information of the vehicle monitored by the ECU 50. Correspondingly, the operation can be determined.

The second electric device 30 is an electric equipment of a vehicle which is constantly operated by receiving power from the generator 40 and / or the battery 10 together with the engine ON.

The generator 50 generates power by using the rotation of the engine, and the generation voltage may be adjusted in response to the generation control of the ECU 30. Under the control of the ECU 30, the generator 20 may convert the generated power and output the generated power to the battery 10, the first electric device 20, and the second electric device 30.

The generator 40 generates power by the control of the power generation control logic built in the ECU 50. The generator 40 may be controlled so that maximum power is generally generated in a decelerated state of the vehicle.

The ECU 30 is interlocked with the vehicle's engine, the battery 10, the generator 40, and the like, monitors the state information of the vehicle transmitted from various sensors arranged in the vehicle, and generates a generator by a built-in power generation control logic. 40) can be controlled.

The ECU 50 controls the generator 40 to generate the maximum power when it is determined that the vehicle is in a decelerated state, and subtracts the maximum charging power amount of the battery 10 from the amount of power generated by the control of the generator 40. The surplus power can be calculated. In addition, the ECU 50 may control whether power is supplied to the first electric device 20 in response to the surplus power amount calculated above.

If it is determined that the vehicle is in a deceleration state, it is determined that the vehicle speed is decelerating and fuel is cut-off, the brake is in operation, or the axel pedal is not depressed. Can be.

The ECU 50 calculates surplus power by subtracting the maximum charge power of the battery 10 from the power generated by the generator 40, and supplies power to the first electric device 20 in response to the calculated surplus power. Can be controlled.

The surplus power may be calculated by subtracting the amount of power generated by the second electric device 30 from the amount of power generated by the generator 40 by the sum of the amount of power generated by the second electric device 30.

The ECU 50 controls the generator 40 to generate the maximum power while controlling the surplus power to be supplied to the first electric device 20 when the surplus power is greater than the power consumption of the first electric device 20. Can be controlled.

In addition, when the plurality of first electric devices 20 is provided, the ECU 50 may include first electric power that may be operated in a range of surplus electric power amount based on power consumption according to the selective operation of each of the first electric devices 20. The generator 40 may be controlled so that the generator 40 generates the maximum power while selecting the devices 20 and controlling to supply power to the selected first electrical devices 20.

As an example, the ECU 50 compares the set values set with the set power corresponding to the power consumption amount according to the selective operation of each of the first electric devices 20 with the surplus power amount, and the largest set value closest to the surplus power amount among the set values. May be selected and controlled to supply power to the first electric devices according to the amount of power consumption corresponding to the selected set value.

For example, when the first electric devices 20 according to the power consumption corresponding to the selected set value are a cooling fan, a blower fan, and an electric water pump, the ECU 50 has a surplus power of a cooling fan, a blower fan, and an electric motor. Control to be supplied with water pump.

The ECU 50 may include a table listing the first electric devices 20 according to the amount of power consumption corresponding to each of these setting values. For example, the table blows the first electric device 20 according to the power consumption amount corresponding to the first set value among the set values to the cooling fan, and blows the first electric device 20 according to the power consumption amount corresponding to the second set value. The fan may have a list in which the first electric device 20 according to the amount of power consumption corresponding to the third set value is variously combined, such as a combination of a cooling fan and a blow fan.

 In addition, the ECU 50 may control to supply power to the first electric devices 20 at a priority determined by state information of the vehicle input from the outside.

2, the effect of the vehicle power generation control system 1 according to an embodiment of the present invention will be described. 2 is a graph for explaining the effect of the vehicle power generation control system according to an embodiment of the present invention.

The vehicle power generation control system 1 according to an embodiment of the present invention selects the first electric devices 20 capable of operating in the range of surplus power, and the first electric device 20 as shown in the third graph from the top of FIG. 2. By supplying power to the power supply, the generator 40 can be controlled to limit the charging current supplied to the battery 10 as shown in 'B' of FIG.

That is, the vehicle power generation control system 1 according to the present embodiment does not need to limit the power generation of the generator 40 as in the prior art to limit the charging current, and the power of the generator 40 as shown in 'A' of FIG. 2. It is possible to keep the maximum.

Hereinafter, the control operation of the vehicle power generation control system 1 according to an embodiment of the present invention will be briefly described with reference to FIG. 3. 3 is a control procedure diagram of a vehicle power generation control system according to an embodiment of the present invention.

First, the vehicle power generation control system 1 determines whether the vehicle is in a decelerated state when the engine is turned on (S310), and if it is determined that the vehicle is not in a decelerated state, the battery information from the battery 10 and the generator 40. The conventional power generation control is performed using the generator information from the vehicle information and the vehicle information from the engine (S315).

On the other hand, if it is determined in step S310 that the vehicle is in a decelerated state, the amount of surplus power is calculated by subtracting the maximum charging power of the battery 10 from the amount of power generated by the generator 40, and generated by the generator 40. In operation S320, it is determined whether the amount of surplus power calculated is greater than a set value corresponding to the power consumption of the first electric device 20 that is selectively supplied by the external control to operate.

If it is determined in step S320 that the surplus power is larger than the set value, the vehicle power generation control system 1 performs the conventional power generation control (S325).

On the other hand, when it is determined in step S320 that the surplus power is not greater than the set value, the vehicle power generation control system 1 controls to supply power to the first electric device 20 while the generator 40 is at maximum power. The generator 40 is controlled to generate (S330).

Finally, when the engine is OFF, the vehicle power generation control system 1 ends the present control procedure (S340).

As such, the vehicle power generation control system 1 according to an embodiment of the present invention utilizes surplus power exceeding the maximum charging power of the battery among the power generated in the regenerative braking section to drive the first electric device 20. By limiting the excess current supplied to the battery 10 to improve the durability of the battery 10 and at the same time improve the fuel economy.

In a modified form of the vehicle power generation control system 1 according to an embodiment of the present invention, when the first electric devices are already in operation, the set value corresponding to the amount of power consumed by the operation is smaller than the amount of surplus power. A system for controlling the operation of the first electrical devices can also be implemented.

1: Vehicle power generation control system
10: Battery
20: first electrical device
30: second electric device
40: generator
50: ECU

Claims (10)

A generator for generating electric power using the rotational force of the engine;
A battery that receives and charges power generated by the generator;
A first electric device that is selectively supplied with power generated by the generator and controlled by external control; And
An ECU (Electronic Control Unit) is included to increase the voltage of the generator during regenerative braking to charge electricity to the battery, and to limit power or current to the battery to prevent durability of the battery due to excessive charging current.
If it is determined that the vehicle is in a deceleration state, the ECU controls the generator to generate the maximum power without limiting the power or current to the battery, and the maximum amount of the battery from the amount of power generated by the control of the generator. And an electronic control unit (ECU) for controlling whether power is supplied to the first electric device in response to the calculated surplus power amount by subtracting a charge power amount. The method of claim 1,
The ECU controls the generator so that the generator generates the maximum power while controlling to supply power to the first electric device when the surplus power is greater than the power consumption of the first electric device. Control system. The method of claim 1,
The first electric device is provided in plurality,
The ECU may select first electrical devices capable of operating within the surplus power amount based on the power consumption amount according to the selective operation of each of the first electrical devices, and supply power to the selected first electrical devices. And controlling the generator such that the generator generates the maximum power while controlling the vehicle. The method of claim 3,
The ECU compares the set values and the surplus power respectively set according to the power consumption according to the selective operation of the first electrical devices, selects a large set value closest to the surplus power among the set values, and selects the selected power. The power generation control system for a vehicle, characterized in that for controlling to supply power to the first electrical devices according to the amount of power consumption corresponding to the set value. 5. The method of claim 4,
And the ECU comprises a table listing first electric devices according to power consumption corresponding to each of the set values. The method of claim 1,
And said ECU controls to supply electric power to said first electric devices by a priority determined by state information of a vehicle input from the outside. The method of claim 1,
And further comprising a second electric device that is constantly supplied with power generated by the generator and operates.
The surplus electric power amount is calculated by subtracting the sum of the electric power amount by the second electric apparatus from the electric power generated by the generator plus the maximum electric power of the battery. The method of claim 1,
When it is determined that the vehicle is in a deceleration state, it is determined that the vehicle speed is decelerating and fuel is cut off, the brake is in operation, or the axel pedal is not depressed. Control system. The method of claim 1,
The first electric device is a power generation control system for a vehicle, characterized in that at least one of a cooling fan, a blower fan, an electric water pump, an electric air conditioning pump and a heating wire. The power generation control of the generator for generating power by the rotational force of the engine to charge the battery to increase the voltage of the generator during regenerative braking to charge electricity to the battery, and to prevent the durability of the battery due to excessive charging current In the control method of the vehicle power generation control system for limiting the power or current to the battery,
Determining whether the vehicle is in a decelerated state when the engine is turned on;
If it is determined that the vehicle is in a decelerated state, calculating surplus power by subtracting the maximum charge power of the battery from the power generated by the generator without limiting power or current to the battery;
Comparing the calculated set amount of surplus power with a set value set corresponding to the power consumption of the first electric device that is selectively supplied with power generated by the generator by an external control; And
And controlling the generator to generate the maximum power while controlling the power supply to the first electric device when the surplus power is greater than the set value. .

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