KR101501021B1 - Driving method of CVT hybrid-tractor engine system and hybrid-tractor engine using it - Google Patents

Abstract

The present invention relates to an engine and a motor-generator driving method of a CVT hybrid tractor, and a hybrid tractor engine system and a hybrid tractor using the same, the method comprising the steps of: i) starting a tractor internal combustion engine (s100) I) setting of an initial speed ratio N ₀ and a target speed Sw (s300), iv) running step s400, v) setting of an engine speed (Re) (S500), (vi) determining whether the engine is overloaded or underloaded (s600), (vii) when the engine is overloaded, corresponds to the lowest point (F) of the fuel consumption rate curve (700), viii) supplying power from the battery (600) in an overload section of the engine and driving the motor of the motor-generator (400) to increase the torque of the drive shaft Engine overload section of the motor-generator 400. The motor- Ix) calculating the required torque amount Trq so that the engine rotation speed R during running converges on the high-rotation minimum fuel consumption rotation speed Rf, and calculates the motor torque amount according to the required torque amount Trq (S900), x) a speed ratio N adjusting step (s1000) for increasing the speed ratio N to reduce the required torque amount Trq, xi) (S1100) charging the battery (600) to drive the generator of the hybrid tractor (400) to charge the battery (600).

Description

TECHNICAL FIELD [0001] The present invention relates to an engine and a motor-generator driving method of a continuously variable transmission hybrid tractor, and a hybrid tractor engine system and a hybrid tractor using the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine and a motor-generator driving method of a hybrid tractor, a hybrid tractor engine system and a hybrid tractor using the same, and more particularly, to improve fuel consumption efficiency of a CVT hybrid tractor.

Generally, a hybrid vehicle refers to a vehicle driven by using two power sources, and uses the battery 600 as an energy storage device of the hybrid vehicle. The hybrid vehicle as described above includes a generator, a rechargeable battery 600, a motor, and the like in addition to the structure of an existing internal combustion engine in order to achieve a high fuel efficiency. The mechanical energy for driving the vehicle generated from the engine It is used as a power source for a vehicle and as a generator input. The mechanical energy of the engine transmitted to the generator is outputted as electrical energy by rotating the rotor of the generator. The electrical energy output from the generator is stored in the battery 600, and is transmitted to the engine together with the mechanical energy Or as a driving force for independently driving the vehicle.

Hybrid cars and hybrid tractors have big differences in driving methods. FIG. 1 is a graph illustrating a difference in a driving method between a hybrid vehicle and a hybrid tractor.

The main operation region of the hybrid vehicle is shifted from the idling state (Idle) to the maximum torque point, and the shift occurs near or below the maximum torque point. The vehicle starts from the idling state and determines the torque amount of the engine in accordance with the driver's manipulated amount of the accelerator (acceleration will). The vehicle is accelerated or decelerated by the difference between the running load (air resistance, road surface, inclination) do. In other words, the driver's intention is to change the speed of the vehicle.

On the other hand, in the hybrid tractor, the main operation range is from the high idle state to the maximum torque point, and in order to work at a constant speed, the idle speed (high idle) or constant engine speed .

During operation, the engine torque is generated by the work load (resistance), and when the load is greater than the maximum torque that can be generated in the set speed lever state, the engine speed decreases. In other words, the factor that changes the speed of the vehicle is that the speed of the tractor is determined by the workload in contrast to the driver's will.

Publication No. 10-2012-0009954 discloses a hybrid work vehicle and a hybrid work vehicle, characterized in that the load fluctuation is determined by using a displacement of flywheel or fly ball in a governor, and the motor-generator 400 is controlled in accordance with the load fluctuation And a control method thereof. The hybrid working vehicle according to an embodiment of the present invention senses the variation of the load with the variation amount of the flywheel or the fly ball measured by using the displacement measuring device, and when the load increases, the motor- And when the load is reduced, the motor-generator 400 is driven as a generator to recover the energy. In this manner, the rotational speed of the diesel engine can be quickly and accurately detected based on the change in the position of the flywheel or the fly ball, without requiring the installation of a complicated device such as a load torque measuring device, and by controlling the motor- It improves the energy efficiency of the hybrid working vehicle and improves the riding comfort of the driver. However, the above-described invention does not take into account the fuel consumption amount in the high output section, and thus has a problem in that the fuel consumption amount management can not be expected.

2 is a graph showing a working area of a conventional hybrid tractor.

Conventional hybrid tractors prefer the general operators to have high working efficiency (short working time), and because the torque margin in the high output area (the difference between the maximum torque and the torque at the working engine speed) is large, The engine is stalled or the engine can escape without shifting. Therefore, the engine is operated in a high output range rather than a high efficiency range. However, as shown in the graph, the high output region has a problem in that the fuel consumption is high due to the high fuel consumption rate in the high output region.

That is, in the hybrid tractor according to the present invention, the motor-generator 400 is driven by the motor to assist the motor when the motor is overloaded, the motor-generator 400 is driven by the generator when the motor- To work in a high efficiency region in which the fuel consumption rate is low without operating in a large high output region.

Accordingly, the present invention provides an internal combustion engine comprising an internal combustion engine 100, an engine control unit 200 for controlling the engine revolution speed per minute (rpm) of the internal combustion engine, a continuously variable transmission (CVT) A motor-generator control unit 500 for controlling the motor-generator 400, a motor-generator control unit 500 for controlling the motor-generator 400, A battery 600 for supplying and storing electric power to the motor-generator 400; and a battery controller 800 for controlling the battery 600. In the driving method of the engine and the motor-generator of the hybrid tractor, ,

i) a starting step (s100) of the tractor internal combustion engine;

ii) an engine speed Re setting step s200 for determining the engine speed Re;

iii) an initial speed ratio N0 and a target speed Sw setting step s300;

iv) a driving step (S400);

v) a fuel supply amount depressurization step (s500) according to a load for maintaining the engine speed Re;

vi) Determining whether the engine is overloaded or underloaded at the set engine speed (S600); (When the required torque of the engine generated by the load becomes larger than the engine torque generated when the governor is opened to the maximum, it is judged as an overload)

vii) an engine speed at the time of overloading - a high-rotation minimum fuel consumption rotational speed (Rf) calculating step (S700) corresponding to a lowest point (F) of the fuel consumption rate curve;

(s800) of an engine overload section motor-generator 400 that receives electricity from the battery 600 in an overloaded period of the engine and drives the motor of the motor-generator 400 to increase the torque of the drive shaft. );

ix) a motor torque amount calculating unit that calculates a required torque amount Trq so that the engine rotation speed R during running converges to the high-rotation minimum fuel consumption rotation speed Rf, and adjusts the motor torque amount by which the motor torque amount is increased or decreased in accordance with the required torque amount Trq An addition / subtraction step (s900);

x) When the required torque amount Trq is larger than the maximum torque amount Tmx of the motor and the maximum engine torque Tex at the rotational speed

Equation 1) ... ... Trq > Tmx + Tex

A speed ratio N adjusting step s1000 for increasing the speed ratio N to decrease the required torque amount Trq when the following expression 1 is satisfied;

xi) charging a battery 600 by driving a generator of the motor-generator 400 in a low load period of the engine to charge the battery 600;

The present invention provides a hybrid tractor engine and a motor-generator driving method, which solve the above problems.

According to the present invention, in a continuously variable transmission (CVT) hybrid tractor, the motor-generator 400 is driven by a motor to assist the motor when the motor is overloaded and the motor- In addition, it is possible to prevent engine stall due to overload while improving fuel economy by not operating in a high output region where fuel consumption is large and in a high efficiency region where fuel consumption rate is low.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a graph illustrating an operation area of an automobile and a tractor.
2 is a graph for explaining an operation region of a conventional hybrid tractor.
3 is a flowchart illustrating an algorithm of an engine and a motor-generator driving method of a hybrid tractor of the present invention.
4 is a graph illustrating the engine idling (Re) setting step s200 of the present invention.
5 is a graph illustrating a high-efficiency region in the driving method of the present invention.
6 is a flowchart illustrating an algorithm of an embodiment of the driving method of the present invention.
7 is a flowchart for explaining an algorithm of another embodiment of the driving method of the present invention.
8 is a block diagram of the engine and motor-generator system of the present invention.
9 is a graph for explaining the step (s600) of determining whether the engine is overloaded or underloaded from the set engine speed according to the present invention.

The present invention relates to an engine and a motor-generator driving method of a hybrid tractor, a hybrid tractor engine system and a hybrid tractor using the same, and more particularly, to improve fuel consumption efficiency of a CVT hybrid tractor. Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The present invention relates to an internal combustion engine having an engine 100, an engine control unit 200 for controlling the engine revolution speed per minute (rpm) of the engine, a CVT 300 for shifting the rotation speed of the engine, A transmission control unit 310 for controlling the continuously variable transmission, a motor-generator 400 connected to the engine 100, a motor-generator control unit 500 for controlling the motor-generator 400, A battery 600 for supplying and storing power to the generator 400 and a battery controller 800 for controlling the battery 600. In the driving method of the engine and the motor-generator of the hybrid tractor,

i) a starting step (s100) of the tractor internal combustion engine;

ii) an engine speed Re setting step s200 for determining the engine speed Re;

iii) an initial speed ratio N0 and a target speed Sw setting step s300;

iv) a driving step (S400);

v) a fuel supply amount depressurization step (s500) according to a load for maintaining the engine speed Re;

vi) Determining whether the engine is overloaded or underloaded at the set engine speed (S600); (When the required torque of the engine generated by the load becomes larger than the engine torque generated when the governor is opened to the maximum, it is judged as an overload)

vii) an engine speed at the time of overloading - a high-rotation minimum fuel consumption rotational speed (Rf) calculating step (S700) corresponding to a lowest point (F) of the fuel consumption rate curve;

(s800) of an engine overload section motor-generator 400 that receives electricity from the battery 600 in an overloaded period of the engine and drives the motor of the motor-generator 400 to increase the torque of the drive shaft. );

ix) a motor torque amount calculating unit that calculates a required torque amount Trq so that the engine rotation speed R during running converges to the high-rotation minimum fuel consumption rotation speed Rf, and adjusts the motor torque amount by which the motor torque amount is increased or decreased in accordance with the required torque amount Trq An addition / subtraction step (s900);

x) When the required torque amount Trq is larger than the maximum torque amount Tmx of the motor and the maximum engine torque Tex within the rotation speed

Equation 1) ... ... Trq > Tmx + Tex

A speed ratio N adjusting step s1000 for increasing the speed ratio N to decrease the required torque amount Trq when the following expression 1 is satisfied;

xi) charging a battery 600 by driving a generator of the motor-generator 400 in a low load period of the engine to charge the battery 600;

And a driving method of the motor-generator.

The engine speed Re setting step s200 for determining the engine speed Re is a method in which the user adjusts the fuel injection amount of the engine through the governor device 210 of the engine control unit 200, (Re) can be set.

The engine speed Re setting step s200 sets the fuel injection amount of the engine to the governor device 210 of the engine control unit 200 according to the purpose or preference of the driver, The torque curve a of the engine is determined accordingly.

The initial speed ratio N ₀ and the target speed Sw setting step s 300 may be set such that the user inputs the target speed Sw through the input means 220 of the engine control unit 200 or the user inputs the target speed Sw through the transmission controller 310 The target speed Sw can be set by inputting the initial speed change ratio N ₀ . That is, in this step, the initial transmission gear ratio N ₀ is determined and the transmission is performed based on the initial transmission gear ratio N ₀ .

After completing the above-described setting step, the tractor is driven, and the tractor is operated while maintaining the engine speed Re for the constant speed operation. The fuel supply amount increase / decrease step s500 according to the load for maintaining the engine speed Re adjusts the fuel injection amount of the engine through the governor device 210 of the engine control unit 200, The engine speed is maintained at the engine speed Re set in the engine speed Re setting step s200. That is, the engine speed is maintained by increasing or decreasing the fuel injection amount while maintaining the speed ratio according to the amount of load applied.

During the operation and operation of the tractor, an overload occurs due to the strength of the work or obstacles. If the amount of torque required to overcome the load due to the overload is larger than the amount of torque output by the engine, the tractor stalls, and necessary measures are required in advance.

In step s600 of determining whether the engine is overloaded or underloaded, as shown in Fig. 9,

In order to maintain the engine rotation speed Re set at the engine speed Re setting step s200, the required torque Tr of the engine required for the load at the time of operation is the maximum engine torque Tm )about

Equation 2) ... Tr > Tm

It is preferable to judge the case of satisfying the expression (2) as the overload state.

That is, the overload situation means a section in which the required torque Tr according to the load exceeds the maximum engine torque Tm under the set speed ratio.

As shown in FIG. 5, the output curve b and the fuel consumption rate curve c are determined according to the engine torque curve a determined above, whereby the maximum efficiency point also varies. The present invention calculates a high-rotation minimum fuel consumption rotation speed (Rf) corresponding to a lowest point (F) of the engine speed-fuel consumption rate curve (c) in order to operate in an interval where the engine efficiency is maximized during overloading.

The high-rotation minimum fuel consumption rotation speed Rf calculating step s700 corresponding to the lowest point F of the engine speed-fuel consumption curve c is calculated by calculating an inflection point in an area of 2500 rpm or less on the fuel consumption rate- It is preferable to define a point at which the highest rotation speed per minute is defined as an upper-rotation minimum fuel consumption point F and an engine rotation speed corresponding to the higher-rotation minimum fuel consumption point F is defined as an upper-rotation minimum fuel consumption rotation speed Rf Do. This is because the engine speed-fuel consumption curve (c) may have various inflection points depending on the engine.

When the hybrid tractor of the present invention is overloaded, the motor is operated to compensate for a shortage of the torque, and the engine rotation speed R during running in order to operate at the high rotation minimum fuel consumption point (F) And calculates the required torque amount Trq so as to converge to the consumed rotational speed Rf.

A motor torque amount adding / subtracting step of calculating a required torque amount Trq so that the running engine speed R converges to the high-rotation minimum fuel consumption rotational speed Rf and adding / subtracting the motor torque amount in accordance with the required torque amount Trq the required torque amount Trq is a difference between the torque amount Trf at the high rotation minimum fuel consumption revolution speed Rf and the running torque amount Tr corresponding to the engine revolution speed R during running

Equation 3) ... Trq = Trf - Tr

(3).

That is, the required torque amount Trq is calculated in order to operate at the high-rotation minimum fuel consumption rotation speed Rf of the high-speed minimum fuel consumption point F in the high-efficiency region of Fig. 5, and the motor is operated by the required torque amount Trq So as to converge the driving engine revolution speed to the high rotation minimum fuel consumption revolution speed (Rf).

If the required torque amount Trq is larger than the sum of the maximum torque amount Tmx of the motor and the maximum engine torque Tex within the rotation speed

Equation 1) ... ... Trq > Tmx + Tex

When the expression (1) is satisfied, the transmission ratio N is increased to decrease the required torque amount Trq, and the reduced required torque amount Trq is calculated again and applied to the motor. According to this method, even when the tractor is overloaded, it is possible to maintain the engine rotation speed converging to the maximum rotation minimum fuel consumption rotation speed (Rf), and as a result, the fuel consumption can be greatly reduced.

In the speed ratio N adjusting step s1000 for raising the speed ratio N to reduce the required torque amount Trq,

The transmission ratio N is preferably controlled by the CVT 300 and the transmission control unit 310 that controls the CVT.

Further, in the step of adjusting the speed ratio N (s1000) for raising the speed ratio N to reduce the required torque amount Trq,

The amount of change in the required torque amount Trq and the speed ratio N may be determined in proportion to each other. This is to change the transmission ratio proportionally when the load is greatly changed.

At this time, it is preferable that the change of the speed ratio N is displayed through the display device 1000.

Also, as shown in FIG. 6, the step of adjusting the speed ratio N (s1000)

Equation 4) ... ... N? N ₀

And a speed ratio reduction step s1100 for adjusting the speed ratio N to the initial speed ratio N ₀ in the case where the condition of the above-mentioned expression (4) is satisfied. This is because it is in accordance with the intention of the user to operate the initial transmission ratio (N ₀ ) which was initially set when the overload is terminated and the vehicle is operated under a low load condition.

It is also preferable that the vehicle further includes a display step s1010 for displaying a change in the speed ratio N for adjusting the speed ratio N to an initial speed ratio N ₀ through the display device 1000.

As another example, as shown in FIG. 7, the step of adjusting the speed ratio N (s1000)

Equation 5) ... ... Trq < Tmx

Equation 6) ... ... N> N ₀

(N) downward step 1200 for adjusting the speed ratio N downward when the conditions of the above-mentioned equations 5) and 6) are satisfied. This is to reflect the situation in which the load is weakened to the transmission ratio N which increases continuously depending on the load.

It is also preferable that a display step s1210 for displaying a change in the speed ratio N for adjusting the speed ratio N to the initial speed ratio N ₀ through the display device 1000 is included.

The present invention also provides an engine control system for an internal combustion engine, an engine control unit for controlling an engine revolution speed (rpm) per minute of the engine, a continuously variable transmission (CVT) for shifting the rotation speed of the engine, A transmission control unit 310 for controlling the continuously variable transmission, a motor-generator 400 connected to the engine 100, a motor-generator control unit 500 for controlling the motor-generator 400, A battery 600 for supplying and storing electric power to the motor-generator 400, and a battery controller 800 for controlling the battery 600. In the hybrid tractor,

The engine control unit (200)

A target speed Sw setting module 240, a load determination module 250 and a motor torque amount comparison module 260. The engine speed setting module 230 sets the engine speed Re, And an engine rpm sensing module (270) of the engine.

The engine control unit 200 preferably includes a display unit 1000 for displaying status information of the engine to a driver.

The engine speed Re setting module 230 for determining the engine speed Re adjusts the fuel injection amount of the engine through the governor device 210 of the engine control unit 200 to determine the engine idling speed Re, Can be set.

The target speed Sw setting module 240 preferably includes input means 220 for inputting a target speed.

The load determination module 250 determines

In order to maintain the engine rotation speed Re set at the engine speed Re setting step s200, the required torque Tr of the engine required for the load at the time of operation is the maximum engine torque Tm )about

Equation 2) ... Tr > Tm

It is preferable to judge the case of satisfying the expression (2) as the overload state.

The engine control unit 200 calculates the maximum rotation minimum fuel consumption rotation speed Rf that calculates the maximum rotation minimum fuel consumption rotation speed Rf corresponding to the lowest point F of the engine rotation speed-fuel consumption rate curve c at the time of overloading Module 280. &lt; / RTI &gt;

The engine control unit 200 calculates the required torque amount Trq for calculating the required torque amount Trq so that the engine rotation speed R during running converges on the high rotation minimum fuel consumption rotation speed Rf, .

In the motor torque amount comparison module 260, the engine control unit 200 preferably compares the magnitude of the required torque amount Trq with the magnitude of the maximum torque amount Tmx of the motor.

That is, according to the present invention, in the hybrid tractor of the CVT, when the motor-generator 400 is overloaded, the motor-generator 400 is driven by the motor to assisting the power, It is possible to prevent the stall of the engine due to the overload while improving the fuel efficiency by allowing the engine to operate in a high efficiency region where the fuel consumption rate is low and not operating in the high output region where the fuel consumption amount is large.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it should be understood that various changes and modifications will be apparent to those skilled in the art. Obviously, the invention is not limited to the embodiments described above. Accordingly, the scope of protection of the present invention should be construed according to the following claims, and all technical ideas which fall within the scope of equivalence by alteration, substitution, substitution, Range. In addition, it should be clarified that some configurations of the drawings are intended to explain the configuration more clearly and are provided in an exaggerated or reduced size than the actual configuration.

100. Engines
200. An engine control unit
210. Governor
220. Input means
230. Engine speed (Re) setting module
240. Target speed (Sw) setting module
250. Load determination module
260. Motor torque amount comparison module
270. rpm sensing module per minute
280. High-rotation minimum fuel consumption rotation speed (Rf) calculation module
290. The required torque (Trq)
300. Transmission
310. Transmission control section
400. Motor-generator
500. Motor-
600. Battery
800. Battery control section
1000. Display device

Claims (25)

An engine control apparatus for an internal combustion engine, comprising: an engine control unit (200) for controlling an engine revolution speed (rpm) per minute of the engine; a continuously variable transmission (CVT) A transmission control unit 310 for controlling the transmission, a motor-generator 400 connected to the engine 100, a motor-generator control unit 500 for controlling the motor-generator 400, And a battery control unit (800) for controlling the battery (600), the method comprising the steps of:
i) a starting step (s100) of the tractor internal combustion engine;
ii) an engine speed Re setting step s200 for determining the engine speed Re;
iii) an initial speed ratio N0 and a target speed Sw setting step s300;
iv) a driving step (S400);
v) a fuel supply amount depressurization step (s500) according to a load for maintaining the engine speed Re;
vi) Determining whether the engine is overloaded or underloaded at the engine speed (s600);
vii) an engine speed at the time of overloading - a high-rotation minimum fuel consumption rotational speed (Rf) calculating step (S700) corresponding to a lowest point (F) of the fuel consumption rate curve;
(s800) of an engine overload section motor-generator 400 that receives electricity from the battery 600 in an overloaded period of the engine and drives the motor of the motor-generator 400 to increase the torque of the drive shaft. );
ix) a motor torque amount calculating unit that calculates a required torque amount Trq so that the engine rotation speed R during running converges to the high-rotation minimum fuel consumption rotation speed Rf, and adjusts the motor torque amount by which the motor torque amount is increased or decreased in accordance with the required torque amount Trq An addition / subtraction step (s900);
x) When the required torque amount Trq is larger than the maximum torque amount Tmx of the motor and the maximum engine torque Tex within the rotation speed
Equation 1) ... ... Trq > Tmx + Tex
A speed ratio N adjusting step s1000 for increasing the speed ratio N to decrease the required torque amount Trq when the following expression 1 is satisfied;
xi) charging a battery 600 by driving a generator of the motor-generator 400 in a low load period of the engine to charge the battery 600;
And the motor-generator is driven by the motor.
The method according to claim 1,
The engine speed Re setting step s200 for determining the engine speed Re is a method in which the user adjusts the fuel injection amount of the engine through the governor device 210 of the engine control unit 200 to adjust the engine idling Re) of the engine and the motor-generator of the hybrid tractor.
The method according to claim 1,
Setting the initial speed ratio N ₀ and the target speed Sw (s300);
Wherein the user inputs the target speed (Sw) through the input means (220) of the engine control unit (200).
The method according to claim 1,
Setting the initial speed ratio N ₀ and the target speed Sw (s300);
Wherein the user inputs the initial speed ratio N ₀ through the transmission controller 310 to set the target speed Sw.
The method according to claim 1,
The fuel supply amount increasing / decreasing step s500 according to the load for maintaining the engine rotation speed Re
The amount of fuel injected into the engine is adjusted through the governor device 210 of the engine control unit 200 to adjust the engine speed of the vehicle to the engine speed set in the engine speed Re setting step s200, (Re) of the engine and the motor-generator of the hybrid tractor.
The method according to claim 1,
In step s600 of determining whether the engine is overloaded or underloaded,
In order to maintain the engine rotation speed Re set at the engine speed Re setting step s200, the required torque Tr of the engine required for the load at the time of operation is the maximum engine torque Tm )about
Equation 2) ... Tr > Tm
(2) is determined to be an overload state. &Lt; RTI ID = 0.0 &gt; 1 &lt; / RTI &gt;
The method according to claim 1,
In the high-speed minimum fuel consumption rotational speed Rf calculating step s700 corresponding to the lowest point F of the engine speed-fuel consumption rate curve c at the time of overload, the high-speed minimum fuel consumption point F is calculated as the fuel consumption rate- Wherein the maximum rotation speed is defined as a point at which the number of revolutions per minute is the highest among the inflection points in the range of 2500 rpm or less on the rotation speed graph.
The method according to claim 1,
A motor torque amount adding / subtracting step of calculating a required torque amount Trq so that the running engine speed R converges to the high-rotation minimum fuel consumption rotational speed Rf and adding / subtracting the motor torque amount in accordance with the required torque amount Trq the required torque amount Trq is a difference between the torque amount Trf at the high rotation minimum fuel consumption revolution speed Rf and the running torque amount Tr corresponding to the engine revolution speed R during running
Equation 3) ... Trq = Trf - Tr
(3). &Lt; RTI ID = 0.0 &gt; [10] &lt; / RTI &gt;
The method according to claim 1,
In the speed ratio N adjusting step s1000 for raising the speed ratio N to reduce the required torque amount Trq,
Wherein the speed ratio N is controlled by a continuously variable transmission (CVT) 300 and a transmission control unit 310 that controls the continuously variable transmission.
The method according to claim 1,
In the speed ratio N adjusting step s1000 for raising the speed ratio N to reduce the required torque amount Trq,
And the amount of change in the required torque (Trq) and the speed ratio (N) are proportional to each other.
9. The method of claim 8,
And the display device (1000) displays the change in the speed ratio (N).
The method according to claim 1,
The step of adjusting the speed ratio N (s1000)
Equation 4) ... ... N? N ₀
And a speed ratio reduction step (s1100) of adjusting the speed ratio N to an initial speed ratio N ₀ when the condition of the above expression (4) is satisfied.
13. The method of claim 12,
And a display step (s1010) for displaying, through the display device (1000), a change in a speed ratio (N) for adjusting the speed ratio (N) to an initial speed ratio (N ₀ ) A method of driving a generator.
The method according to claim 1,
The step of adjusting the speed ratio N (s1000)
Equation 5) ... ... Trq < Tmx
Equation 6) ... ... N> N ₀
(N) downward step (1200) for adjusting the speed ratio (N) downward when the condition of the above formula (5) and the formula (6) is satisfied. .
15. The method of claim 14,
Engine and a motor of a hybrid tractor comprising a said transmission ratio (N) to the initial gear ratio (N _0), the display step (s1210) for display through the device 1000 displays the change in the transmission ratio (N) to adjust a - A method of driving a generator.
An engine control apparatus for an internal combustion engine, comprising: an engine control unit (200) for controlling an engine revolution speed (rpm) per minute of the engine; a continuously variable transmission (CVT) A transmission control unit 310 for controlling the transmission, a motor-generator 400 connected to the engine 100, a motor-generator control unit 500 for controlling the motor-generator 400, And a battery controller (800) for controlling the battery (600), the hybrid tractor comprising:
A hybrid tractor characterized by being driven by an engine of a hybrid tractor according to any one of claims 1 to 15 and a method of driving a motor-generator.
An engine control apparatus for an internal combustion engine, comprising: an engine control unit (200) for controlling an engine revolution speed (rpm) per minute of the engine; a continuously variable transmission (CVT) A transmission control unit 310 for controlling the transmission, a motor-generator 400 connected to the engine 100, a motor-generator control unit 500 for controlling the motor-generator 400, And a battery control unit (800) for controlling the battery (600), the system comprising: a battery (600)
The engine control unit (200)
An engine speed Re setting module 230 for determining an engine speed Re and a target speed Sw setting module 240, a load determination module 250 and a high rotation minimum fuel consumption rotation speed Rf ) Calculating module 280, a motor torque amount comparing module 260, a required torque amount Trq calculating module 290 and an engine rpm sensing module 270 of the engine Lt; / RTI &
The drive control of the engine and the motor-generator by the drive system of the hybrid tractor,
After the engine is started, the engine speed setting module 230 sets the engine speed Re, the transmission controller 310 sets the initial speed ratio N0, and sets the target speed Sw When the module receives the target speed Sw,
The engine control unit adds or subtracts the fuel supply amount according to the load to maintain the set engine speed Re, and the load determination module 250 determines whether the engine is overloaded or underloaded at the set engine speed Re , &Lt; / RTI &gt;
In the case where it is determined that the engine is overloaded, the motor-generator control unit 500 receives the electric power from the battery and drives the motor of the motor-generator to perform an engine overload section running process to increase the torque of the drive shaft. The consumption rotation speed Rf calculation module 280 calculates the maximum rotation minimum fuel consumption rotation speed Rf corresponding to the lowest point F of the engine speed-fuel consumption curve, The controller 290 determines that the engine revolution speed R measured by the engine revolution sensing module 270 of the engine converges to the calculated high rotation minimum fuel consumption revolution speed Rf, Generator control unit 500 calculates the motor torque amount Trq according to the calculated required torque amount Trq,
The motor torque amount comparison module 260 compares the calculated required torque amount Trq with the maximum torque amount Tmx of the motor and the sum of the maximum engine torque Tex within the rotation speed,
Equation 1) ... ... Trq &gt; Tmx + Tex
The transmission control unit decreases the required torque amount Trq by raising the transmission ratio N,
The motor-generator control unit may include a function of driving the generator of the motor-generator 400 to charge the battery 600 when the load determination module 250 determines that the engine load is low The drive system of the hybrid tractor is characterized by.
18. The method of claim 17,
Wherein the engine control unit (200) includes a display unit (1000) for displaying status information of the engine to a driver.
18. The method of claim 17,
The engine speed Re setting module 230 for determining the engine speed Re adjusts the fuel injection amount of the engine through the governor device 210 of the engine control unit 200 to determine the engine idling speed Re, Is set to a predetermined value.
18. The method of claim 17,
Wherein the target speed (Sw) setting module (240) comprises input means (220) for inputting a target speed.
18. The method of claim 17,
The load determination module 250 determines
In order to maintain the set engine speed Re, the required torque Tr of the engine required for the load applied at the time of the running is set to about the maximum engine torque Tm at the time of maximum fuel injection
Equation 2) ... Tr > Tm
(2) is satisfied is determined as an overload state.
delete delete delete 1. A hybrid tractor driven by an internal combustion engine and a motor,
21. A hybrid tractor comprising a hybrid tractor drive system as claimed in any one of claims 17 to 21.

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