KR101427913B1 - Multi cylinder engine - Google Patents

Abstract

The present invention relates to a multi-cylinder engine, and more particularly, to a multi-cylinder engine having improved vibration characteristics and fuel economy.

To this end, according to the present invention, in a multi-cylinder engine having a plurality of cylinders,

At least one variable cylinder that performs an explosion stroke or is stopped so that the exhaust valve or the intake valve is not selectively operated;

Cylinders which perform an explosion stroke at an even interval with respect to the rotational angle of the crankshaft, except for the cylinders which are hibernated; And

A control unit for activating or stopping the variable cylinder according to a set load condition;

And a multi-cylinder engine.

Multi-cylinder engine, variable cylinder, cylinder, oxygen sensor

Description

Multi-cylinder engine {MULTI CYLINDER ENGINE}

The present invention relates to a multi-cylinder engine, and more particularly, to a multi-cylinder engine having improved vibration characteristics and fuel economy.

Generally, the engine of a vehicle is equipped with an engine management system.

The engine management system typically uses a computer to control the fuel injection system and the ignition system.

Such smooth and quiet engine operation is closely related to a plurality of cylinders provided in the engine.

That is, as the number of cylinders increases, it becomes easier to balance the various forces acting upon engine operation.

According to U.S. Patent Publication No. 6928988, in a V-type engine having a gasoline direct injection (GDI) structure, there are an exhaust manifold connected between cylinders that are cylindrically stopped, and an exhaust manifold connected to cylinders that do not stop cylinders. And an appropriate fuel injection quantity is controlled by a signal from the oxygen sensor to a cylinder in which the cylinder is being burned when the cylinder is at rest.

However, the engine of a car used mainly in Korea is a V type 6 cylinder, and when three cylinders are stopped in one bank, the remaining three cylinders are operated only by vibration, which causes a vibration problem.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a multi-cylinder engine in which vibration generation is reduced and fuel consumption is reduced during a rest period.

According to an aspect of the present invention, there is provided a multi-cylinder engine including a plurality of cylinders,

At least one variable cylinder that performs an explosion stroke or is stopped so that the exhaust valve or the intake valve is not selectively operated;

Cylinders which perform an explosion stroke at an even interval with respect to the rotational angle of the crankshaft, except for the cylinders which are hibernated; And

A control unit for activating or stopping the variable cylinder according to a set load condition;

And a control unit.

The cylinders are divided into a first bank and a second bank, each of which is divided into a number of half, and the oxygen sensor is installed in each of the first bank and the second bank.

In addition,

And four cylinders which perform an explosion stroke at equal intervals of 180 degrees in the rotational direction of the crankshaft, wherein the variable cylinder includes two cylinders.

The apparatus may further include a first cylinder, a second cylinder, a third cylinder, a fourth cylinder, a fifth cylinder, and a sixth cylinder,

A first crank pin corresponding to the first cylinder; A second crank pin corresponding to the second cylinder; A third crank pin corresponding to the third cylinder; A fourth crank pin corresponding to the fourth cylinder; A fifth crank pin corresponding to the fifth cylinder and a sixth crank pin corresponding to the sixth cylinder are disposed,

The first crankpin, the second crankpin, the fourth crankpin, the third crankpin, the sixth crankpin, and the fifth crankpin are arranged at equal intervals in the rotating direction.

Further, the first cylinder, the sixth cylinder, the second cylinder, and the third cylinder sequentially perform an explosion stroke at equal intervals of 180 degrees,

And the fifth cylinder and the fourth cylinder are stopped.

Further, the first cylinder, the sixth cylinder, the second cylinder, and the third cylinder sequentially perform an explosion stroke at equal intervals of 180 degrees,

The fifth cylinder performs an explosion stroke between the first cylinder and the sixth cylinder and the fourth cylinder performs an explosion stroke between the sixth cylinder and the explosion point of the second cylinder .

Further, the fifth cylinder has a crankshaft rotation difference of 60 degrees with the first cylinder,

And the fourth cylinder has a crankshaft rotation difference of 120 degrees with the sixth cylinder.

A valve stopper for controlling the movement of the intake / exhaust valve disposed in the variable cylinder; And

An injector for injecting fuel;

And the control unit controls the valve stop unit and the injector to stop the cylinder.

Further, the injector injects gasoline or diesel directly into the cylinder.

The apparatus may further include an oxygen sensor installed in each of the cylinders to detect an oxygen amount of each cylinder.

As described above, according to the multi-cylinder engine according to the present invention, the fuel economy can be improved by applying to the six-cylinder engine, and the optimized control for the rest cylinder can be performed by the oxygen sensor installed in each bank.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a layout plan view of a six-cylinder engine according to an embodiment of the present invention.

1, a six-cylinder engine includes a first cylinder 1cyl, a second cylinder 2cyl, a third cylinder 3cyl, a fourth cylinder 4cyl, a fifth cylinder 5cyl, and a sixth cylinder 6cyl ).

The first, third and fifth cylinders (1,3,5cyl) are arranged in a row, and the second, fourth and sixth cylinders (2,4,6cyl) are arranged in a row.

At this time, an oxygen sensor is installed in each of the cylinders 1cyl, 2cyl, 3cyl, 4cyl, 5cyl, 6cyl.

Such an oxygen sensor divides the cylinders into a number of halves to distinguish the first bank and the second bank.

An oxygen sensor is provided in each of the first bank and the second bank which are distinguished as described above.

However, by detecting the oxygen amount of the bank in which the explosion / exhaustion is performed most recently from the stagnant cylinder, it is possible to minimize the error of the oxygen sensor detection amount due to the air supply to the stagnant cylinder.

That is, when the fifth cylinder of the first bank is stopped and the oxygen sensor detects the exhaust gas at the moment when the first cylinder exhausts the error, the error caused by the air amount of the fifth cylinder can be reduced, and the fourth cylinder of the second bank If the oxygen sensor detects the exhaust gas at the moment when the cylinder 6 emits the exhaust gas at the time of resting, the error due to the air amount of the cylinder 4 can be minimized.

2 is a schematic side view of a crank pin provided in a six-cylinder engine according to an embodiment of the present invention.

Referring to FIG. 2, a crank pin is disposed around a crankshaft (not shown). The six-cylinder engine according to the present embodiment includes a first crank pin 1pin disposed in the first cylinder 1cyl, A second crankpin 2pin disposed in the second cylinder 2cyl, a third crankpin 3pin disposed in the third cylinder 3cyl, a fourth crankpin 3pin disposed in the fourth cylinder 4cyl, A fifth crank pin 5pin disposed in the fifth cylinder 5cyl and a sixth crank pin 6pin disposed in the sixth cylinder 6cyl.

The first, third and fifth crankpins (1, 3, 5pin) are continuously arranged in one crankshaft, and the second, fourth and sixth crankpins Respectively.

2 shows a state in which the first, second, third, fourth, fifth, and sixth crank pins (1,2,3,4,5,6 pin) are disposed with respect to one center point / RTI >

As shown in the drawing, the first crank pin 1pin is disposed at the upper end and the second, third, fourth, fifth, and sixth crank pins 2, 3, 4, do. In particular, the crank pins (1, 2, 3, 4, 5, 6pin) have an even spacing of 60 degrees.

By arranging the crank pins 1, 2, 3, 4, 5, 6pin at equal intervals in this way, balance and vibration characteristics can be easily improved. Further, the inter-pin distance can be minimized, the strength of the crankshaft can be easily secured, and the weight can be minimized.

Figure 3a is a schematic side view of the crankshaft and Figure 3b is a schematic plan view of the crankshaft.

As shown in the figure, the first, second, third, fourth, fifth, and sixth cylinders (1, 2, 3, 4, 5, 6cyl) are sequentially arranged without overlapping. The vibration characteristics can be improved by being symmetrically disposed with respect to the center line of the crankshaft.

4 is a chart showing an explosion sequence of a six-cylinder engine according to an embodiment of the present invention.

Here, the order of explosion of the respective cylinders can be varied in layout by modifying the program of the engine ECU by changing the crankshaft and the camshaft, changing the fuel injector operation sequence and the operation sequence of the spark plug, Only the configuration shown in Fig. 4 will be described in the specification.

4 (a), in the six-cylinder engine according to the embodiment of the present invention, the first cylinder 1cyl, the fifth cylinder 5cyl, the sixth cylinder 6cyl, the fourth cylinder 4cyl, the second cylinder 2cyl and the third cylinder 3cyl sequentially explode.

The explosion distance between the first and fifth cylinders 1cyl and 5cyl is 60 degrees and the explosion distance between the fifth and sixth cylinders 5 and 6cyl is 120 degrees. The explosion distance between the first and second cylinders 4 and 2cyl is 60 degrees and the explosion distance between the second and third cylinders 2 and 3cyl is 180 degrees to be.

4 (b), in the six-cylinder engine according to the embodiment of the present invention, the first cylinder 1cyl, the fifth cylinder 5cyl, the third cylinder 3cyl, 4cyl, the second cylinder 2cyl, and the sixth cylinder 6cyl are sequentially exploded, and the explosion intervals are 60 degrees, 120 degrees, 120 degrees, 60 degrees, and 180 degrees, respectively.

5 is a table showing the load of a six-cylinder engine according to an embodiment of the present invention.

Referring to FIG. 5, performance is 100 percent when six cylinders are operating, about 67 percent performance when four cylinders are operating, and about 32 percent when three cylinders are operating.

As described above, there is an effect that vibration characteristics are improved and fuel economy is improved when four cylinders are operated in a low load state.

That is, high performance can be effectively exhibited when six cylinders are operated under a high load condition.

6 is a control flowchart of a six-cylinder engine according to an embodiment of the present invention.

Referring to FIG. 6, in step S100, an accelerator pedal signal is sensed. Here, the accelerator pedal signal is sensed by the amount of depression of the accelerator pedal.

Thereafter, in step S110, the load of the engine is calculated based on the accelerator pedal signal. Here, the load is compared with a predetermined value.

If the load is smaller than the set value, step S120 is performed. If the load is greater than the set value, step S111 is performed.

That is, in the step S120, the intake / exhaust valves of the two cylinders are stopped, and in the step S111, the fuel supplied to the injectors of the two cylinders selectively opened is opened.

In step 130, it is determined whether the first cylinder 1cyl is in the exhaust state.

At this time, if the first cylinder 1cyl is not in the exhaust state, an endless loop is performed, and if the first cylinder 1cyl is in the exhaust state, the step S140 is performed.

Here, the oxygen amount is detected through the oxygen sensor installed in the first bank and the fuel amount of the bank is controlled.

Thereafter, step S150 is performed.

If the sixth cylinder 6cyl is in the exhaust state, the oxygen amount is detected through the oxygen sensor installed in the second bank. If the sixth cylinder 6cyl is in the exhaust state, And controls the fuel amount of the bank.

Thereafter, the step of receiving the accelerator pedal signal (S100) is repeated.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, And all changes to the scope that are deemed to be valid.

1 is a layout plan view of a six-cylinder engine according to an embodiment of the present invention;

2 is a schematic side view of a crank pin provided in a six-cylinder engine according to an embodiment of the present invention;

Figure 3a is a schematic side view of a crankshaft.

Figure 3b is a schematic plan view of the crankshaft.

4 is a chart illustrating an explosion sequence of a six-cylinder engine according to an embodiment of the present invention.

5 is a table showing the load of a six-cylinder engine according to an embodiment of the present invention.

6 is a control flow chart of a six-cylinder engine according to an embodiment of the present invention.

Claims (10)

In a multi-cylinder engine having a plurality of cylinders, At least one variable cylinder that performs an explosion stroke or is stopped so that the exhaust valve or the intake valve is not selectively operated; Cylinders which perform an explosion stroke at an even interval with respect to the rotational angle of the crankshaft, except for the cylinders which are hibernated; And A control unit for activating or stopping the variable cylinder according to a set load condition; , ≪ / RTI & The plurality of cylinders includes a first cylinder, a second cylinder, a third cylinder, a fourth cylinder, a fifth cylinder, and a sixth cylinder, A first crank pin corresponding to the first cylinder; A second crank pin corresponding to the second cylinder; A third crank pin corresponding to the third cylinder; A fourth crank pin corresponding to the fourth cylinder; Wherein a fifth crank pin corresponding to the fifth cylinder and a sixth crank pin corresponding to the sixth cylinder are arranged, and the first crank pin, the second crank pin, the fourth crank pin, the third crank pin The sixth crank pin and the fifth crank pin are arranged at equal intervals in the rotating direction, Wherein the first cylinder, the sixth cylinder, the second cylinder, and the third cylinder successively perform explosion strokes with equal intervals of 180 degrees, and the fifth cylinder performs explosion stroke of the first cylinder and the sixth cylinder Wherein the fourth cylinder performs an explosion stroke between the sixth cylinder and the second cylinder at the time of explosion, Wherein the fifth cylinder has a crankshaft rotation difference of 60 degrees with the first cylinder and the fourth cylinder has a crankshaft rotation difference of 120 degrees with the sixth cylinder. The method according to claim 1, Wherein the cylinders are respectively divided into a first bank and a second bank which are divided into a half number, and oxygen sensors for detecting the amount of oxygen in the cylinders are provided in the first bank and the second bank, respectively. The method according to claim 1, The cylinders, And four cylinders which perform an explosion stroke at equal intervals of 180 degrees in the rotational direction of the crankshaft, wherein the variable cylinder includes two cylinders. delete The method according to claim 1, The first cylinder, the sixth cylinder, the second cylinder, and the third cylinder successively perform an explosion stroke at equal intervals of 180 degrees, Wherein the fifth cylinder and the fourth cylinder are stopped. delete delete The method according to claim 1, A valve stopper for controlling the movement of the intake / exhaust valve disposed in the variable cylinder; And An injector for injecting fuel; Wherein the control unit controls the valve stop unit and the injector to stop the cylinder. 9. The method of claim 8, Wherein the injector injects gasoline or diesel directly into the cylinder. The method according to claim 1, Further comprising an oxygen sensor installed in each of the cylinders for detecting an amount of oxygen in each cylinder.

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