JPS58178841A - Engine capable of controlling number of operative cylinder - Google Patents

Abstract

PURPOSE:To moderate the torque change that is caused at the time of reducing the number of operative cylinders of a multiplecylinder engine designed to be capable of operating with a reduced number of operative cylinders, by providing an auxiliary exhaust valve opened at the initial stage of the exhaust stroke on the side of cylinders that can be rendered inoperative. CONSTITUTION:In case that cylinders #1 and #4 of a four-cylinder engine are operative and cylinders #2 and #3 are inoperative, an auxiliary exhaust valve is provided on the side of the inoperative cylinders and it is opened at the initial stage of the exhaust stroke irrespective of whether the inoperative cylinders are in operation or at rest. With such an arrangement, even if compression gas is blown off to a crank case during the piston rising process at the time when the inoperative cylinders are kept at rest and their intake and exhaust valves are kept fully closed, a proper compression pressure is always obtained in the cylinders and the torque change can be moderated since the auxiliary exhaust valve is opened at the next cycle and exhaust gas flows back into the cylinders.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a cylinder number control engine that performs partial cylinder operation by suspending the operation of some cylinders in a light engine load operating range.

In general, when an engine is operated under a high load condition, fuel consumption tends to improve, and for this reason, the fuel consumption rate tends to improve when the engine is operated under high load conditions. By avoiding 11 cylinders of IA + l, the load on the remaining working cylinders is relatively increased, and the overall fuel efficiency in the C light load range is improved, and the number of cylinders is controlled 1.
-Komagan IIF450-2ε377 to be considered
04゛).

However, the more cylinders in the C section are driven by 1 + lJ, the longer the interval between explosions becomes.
According to Jrub, the opening operation of the intake valve as well as the exhaust valve is regulated and kept fully closed.
Since contraction and expansion +11ij are repeated, the intake and exhaust valves are closed at this J,... (Partial cylinder operation?) 'fl, so 5. If this partial cylinder operation fails, it will become trapped inside the cylinder during repeated expansion.1. :Jl-1- to the gas or crankcase side
(Blowout 1)) gradually (A) The cylinder pressure in the 1 side cylinder decreases, and the peak value of the cylinder pressure in the idle cylinder is compared to the peak value of the operating cylinder. For example, in Figure 1 (J in-line 4-cylinder engine, intake and II cylinders are stopped). IC et al. show the changes in the in-cylinder force (P, -1) 4) when partial cylinder operation is continued with partial cylinder operation.
+ + Although the earth value of Pi is reduced by 1!1, fA
Continuing Jl (J ζ shown in the diagram), the repulsive force change (J is almost smoothed, and in this state, the combustion pressure peaks at every crank angle of 180' in normal all-cylinder (4-cylinder) operation. On the other hand, if you heat two cylinders, it's better to use two cylinders.
The peak of E force occurs every 360 degrees, but as a result, this peak value becomes considerably high during 4-cylinder operation, which significantly impairs the smoothness of rotation. There is a problem of loss.

The present invention was made by focusing on this problem.
A Urasuke plowing valve that opens at the beginning of the IJI stroke is installed in the C', 1E+L l1llI cylinder () to compensate for the decrease in cylinder pressure in the one il side cylinder due to continued partial cylinder operation. +3
I will compensate by replenishing the 1st qi valve through the 1st qi valve.
Ensures stable compression 11 force 1-7 (suppresses increase in rotational fluctuations).

Hereinafter, the present invention will be illustrated in Example 1. : 4i Shitsui C explanation.

The present invention installs a means for regulating the movement of intake and 1j1 air in some cylinders of a multi-cylinder engine. Although there are many ways to restrict the operation of the air intake valve, we will first introduce an example of the regulating means on the air valve side. Based on FIG. 3 (explained).

In Figure 2, (, 1 is the cylinder head 1-.2 is the II valve, 3 is the [l tsuka j7-m, 4 (ma 1] Tsukashi I7 no 1)
~． 5 A, 5 [31; L n kashi 17) 1~
4 shilling head] (Ichizoshimenotsu 1-161 for your support.) 1~(゛There is.

Forces 1 to 6 cooperate with the valve soup ring 2A (Fig. 3) to open and close the exhaust valve 2 via the tonker arm 3 during the exhaust stroke during operation. When the fill is f]h, the first cam 6△ and this -4- cam (a perfect circle with the same diameter as the pace leak of 3△,
A second cam 6 for holding the exhaust valve 2 fully open is formed adjacent to the second cam 6 (see FIG. 3).

On the other hand, the rocker arm 3 is swingable with respect to the shaft 4.
] ~ Axial direction between 5A and 5B (downward to - in the diagram)
The sea urchins are being held by sea urchins.

In other words, it slides in the axial direction between the brackets 1-5A of the rocker arm 3-h.
A switching ring 7 is installed so that the rocker arm 3 can be
A first spring 8 interposed between the I-lateral switching ring 7
The second interposed between △ and the other 1rag l-5B
The axially inward positioning is performed depending on the tension balance between the spring 8B and the spring 8B.

The switching link 7 is driven via a rod 9 to an actuator composed of a solenoid or a hydraulic cylinder, etc., and when the engine is operating, the switching link 7 is driven in accordance with the first cam 6A. The rods 5-h, j'-m 33 are rounded 4;i so that the exhaust valve 2 performs the valve refill i as shown in FIG. 4(a) (as shown). In this state, the switching link 7 moves toward the -f 1 to 5B side based on the driving force of the 77 kuchi' d- = 10, and as the springs 8△ and 8B are compressed, 1
] The lever arm 3 is pushed, and while its -1411 part 3△ is in the pace reel relative of the cam 6A, the weight shifts to the second) J-muro day. Since the second cam 6 [3 does not have an oval shape that is aligned with the pace leak portion of the first cam 6Δ, in this state, even if the cam 613 rotates, the rocker arm 3 does not swing, and therefore the exhaust gas In order to keep the valve 2 closed, as shown in Fig. 4 (1), the valve rift 1 is connected to the 1 + h state. 8. Although not shown, a valve mechanism similar to that described in CbF is installed on the intake valve side. 4-J, and during operation, the figure 4 (a
)', the sea urchin valve riff 1~ is performed, and when the body j1 is reached, the system enters a resting state in which the sea urchin valve riff 1~ is not performed as shown in FIG. 4(l).

Therefore, it is possible to control the intake and exhaust operations of the cylinder on the idle side by operating the engine and the engine in accordance with the operating condition of the engine.

Figure 55 (No. 1 cylinder #1 of an in-line four-cylinder engine) #1 is the active cylinder, and No. 2 cylinders #2 and 3''
This is an example of a cylinder number control system for M cylinder #3 and J1 side cylinders, and the load lens 16 is linked with the accelerator pedal 15.
The negative 6jf state of the engine is detected in the control circuit 7, and the preset light load 1 is set to 1. When the valve operation of No. 2 and No. 3 cylinder #2. l” 19, 20 (
-] Switch 19Δ, 2OA (I hear C spark plug (
Stopping the current supply to l＼＼ as shown in the diagram]
- The engine is now in partial cylinder operation. 21 is the battery, 22 is the ignition switch, and 23 is the ignition switch. On the other hand, cylinder #2 on the idle side roars. #31 This is where the auxiliary JJI valve 26 is installed (-
JI urea, JJI air valve opens at the beginning of the stroke.

1-Record? +11 assistance + Jl air valve 26 has a dedicated rocker arm 27 f1 as shown in Fig. 6, and the cam shirt 1
Opening/closing is controlled by an auxiliary cam 6C formed at -6. The fill of the auxiliary cam 6C is such that the auxiliary exhaust valve 26 is
7- Open the valve at the beginning of the process and set it so that the valve opening is as shown in Figure 4.

The auxiliary JJI valve 26 is J in Fig. 4(a), (1)).
The sea urchin moves and the body stop works independently, and the turret moves 1.
14 (as shown in Figure 7(a)), the valve opens at the beginning of the exhaust stroke and discharges the burnt gas along with the exhaust valve 2. J'fJ, as shown in Figure 11(b), even during the pause period when the intake valves 28 and 141 are held closed, the valves are opened in China and Germany to replenish gas into cylinder C.
.

'In other words, cylinder #2. In #3, inhale, ill air valve 28°2
When the body is fully closed + 1, the 1 ascending culm of screws 1 to 29 - c
r-c compression nose or taranx side l\do blows out (J
Then, this block [1-harikas is lost/j's +
J1 Ki is next. For this reason, as shown in FIG. 8, there is an appropriate compression f[force C' when the sea urchin is used. -f, In this state, the maximum in-cylinder pressure of the cylinder on the idle side is about half that of the cylinder on the active side. 2. #3-(-
In the next compression stroke, 1f compression pressure is generated in the exhaust stroke after the auxiliary 1j I air valve 26 closes, so each time the crankshaft rotates once, each of them is combined and the pressure is applied to the working cylinder #1. In other words, the 4J engine will experience the peak value of combustion pressure or a pressure change corresponding to this every 180 degrees of crank angle.

As a result, an extremely smooth operating state with less rotational fluctuations from 1 to 1 q can be achieved over the entire operating range.

In summary, according to the present invention, in a J or T engine that performs partial cylinder operation by restricting the opening of the intake and IJl valves in some cylinders, the number of cylinders is controlled to be 0.
An auxiliary exhaust valve that opens at the beginning of the I-stroke is installed, and an IJ valve, which is equivalent to a blow pie, is installed in the cylinder on the idle side during partial cylinder operation.
In addition to reliably replenishing the I air, the cylinder pressure at this time is kept in balance with the operating cylinder, resulting in the effect of ensuring smooth rotation during partial cylinder operation.

In addition, during partial cylinder operation, the cylinder on the idle side has an exhaust
- There is no risk of igniting the IJ by replenishing it, and there is no danger of exacerbating combustion, and since it is fed to high-temperature waste or paper, the combustion in the body pressure side cylinder is increased by 11 times. Nevertheless, it is effective in preventing cooling inside the cylinder and maintaining combustion stability when transitioning to the next operation.

[Brief explanation of the drawing]

FIG. 1 is a Shiatsu diagram in Table 1 showing changes in the cylinder pressures of the operating side cylinder and the body 11 side cylinder of the conventional example. Fig. 2 is a plan view of an example of the first stage that regulates the opening operation of the intake valve or IJI intake valve, showing an embodiment of the present invention; , an explanatory diagram showing the valve timing of the IJI valve!1v and the auxiliary Jil valve, FIG. It is a plan view of the main part.
), (b) IJ is an explanatory diagram of the action of the cylinder on the idle side in the above embodiment when it is in operation and at rest, respectively, and FIG. . 2...υ1 air valve, 3... own horn arm, 6... camshitono ]〇 - 1., 6△, 6 [3... cam, 6c... auxiliary cam,
7...Switching ring, 1o...Akudu T~ri, 25.
... Engine exhaust passage, 26 ... Auxiliary exhaust valve, 27
...Rocker arm for auxiliary exhaust valve, 28...Intake valve. Special Wf Applicant [] San Jidosha Co., Ltd. Kuso-11- Fig. 2 Fig. 3/ρ Table) Fig. 4 (a) When operating (stopped cylinder) Flank horse (・) (b) When on the floor (I) 9 cylinders on the wooden stop side) 10 Kamisuke “Jijito η1 hole 0 - (See above) Crank Yu (0) Fig. 7 See above, appendix

Claims (1)

[Scope of Claims] 1. In a multi-cylinder engine comprising a cylinder on the idle side and a cylinder on the idle side that has a means for regulating the opening operation of the intake valve and exhaust valve in a light load operating range, and a cylinder on the operating side that is constantly operated, the cylinder on the idle side A cylinder number control engine characterized in that each cylinder is provided with an auxiliary exhaust valve that opens at the beginning of the exhaust stroke regardless of whether the cylinder is in operation or not. 2. The cylinder number controlled engine according to claim 1, wherein the auxiliary exhaust valve opens and closes in accordance with an auxiliary cam formed on a camshaft that drives the intake valve or the exhaust valve.