JPH022915Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an improvement of a variable cylinder number device for an engine. The present invention relates to an improved cylinder number variable device that eliminates cylinder pump work and compression work to reduce fuel consumption.

[Prior art]

As is well known, in an internal combustion engine having multiple cylinders, some of the cylinders, for example, 4 out of 8 cylinders, can be deactivated when the load is below a set load, and the supply of fuel to these 4 cylinders is interrupted. Therefore, extra fuel is supplied to the other four cylinders to increase thermal efficiency and ultimately reduce fuel consumption.

By the way, when fuel supply is interrupted, if the intake and exhaust valves in that cylinder are operating normally, the intake and exhaust pump work due to air entering that cylinder and the air flowing into the cylinder will naturally be reduced. Compression work is performed by being compressed. In other words, the fact that these cylinders perform pump work and compression work means that the cylinders to which fuel is continuously supplied are responsible for the load. Therefore, if the work as the load can be eliminated, fuel consumption can be further reduced.

Therefore, when the fuel supply to the deactivable cylinder is stopped, the intake and exhaust pipes of the cylinder to which fuel supply has been stopped are cut off, the gas in the cylinder is sucked out by a vacuum suction device, and the cylinder's pump is pumped. A proposal to eliminate work and compressed work can be found in Jitsugan No. 57-98906.

This proposed device is superior in that it can eliminate the pumping work and compression work of the fuel supply-stopped cylinders with a simple configuration, but because the intake side shutoff valve is provided in the intake pipe, the volume is reduced. Fresh air remaining in the large intake manifold must also be sucked in by the vacuum suction device, and there is a problem in that it takes too long for the inside of the cylinder to become almost vacuum.

[Purpose and structure of the proposal]

The purpose of the present invention is to solve the problems of the conventional cylinder number variable device configured to create a substantially vacuum inside the inactive cylinder using a vacuum suction device and a shutoff valve, and to It is an object of the present invention to provide a cylinder number variable device capable of increasing the effect of reducing the fuel consumption of an engine by shortening the time to create a substantially vacuum.

The variable cylinder number device of the present invention that achieves the above object is provided with a cutoff valve that closes when fuel supply is stopped, at the opening of the intake port and the exhaust pipe of the deactivable cylinder of the variable cylinder number engine, and This device is characterized in that the exhaust passage between the line cutoff valve and the exhaust valve is connected to a vacuum suction device via a suction pipe.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is an explanatory diagram showing the overall configuration of one embodiment of the cylinder number variable device of the present invention, and FIG. 2 is an explanatory diagram showing the detailed configuration for one cylinder.

The engine 1 of this embodiment is an 8-cylinder engine as shown in Fig. 1, of which 4 cylinders can be deactivated, and the variable cylinder number device of the present invention is designed to act on these 4 cylinders. It's summery. Therefore, in this embodiment, the intake manifold 2 and exhaust manifold 3 of the engine 1 are grouped together for four cylinders, and the exhaust manifold 3a of the cylinder whose operation can be stopped is
An exhaust shutoff valve 23 is provided in the middle of the exhaust pipe 5a connected to the exhaust pipe 5a, so that the pipe can be shut off.

Furthermore, in the present invention, a suction pipe 14 is provided between the exhaust manifold 3a of the exhaust pipe 5a and the exhaust shutoff valve 23.
The other end of this suction pipe 14 was connected to a vacuum suction device so that the inside of the cylinder 11 of the cylinder to which fuel supply was stopped could be made substantially vacuum. In the embodiment shown in FIG. 1, a vacuum tank 6 connected to a suction pipe 14 is used as a vacuum suction device, and a negative pressure cutoff valve 24 is provided in the middle of the suction pipe 14 to open and close this negative pressure cutoff valve 24. By doing so, the connection between the deactivated cylinder and the vacuum tank 6, that is, the on/off control of the vacuum suction device is performed. In vehicles that are not equipped with a vacuum tank, a vacuum pump may be used as the vacuum suction device.

On the other hand, the intake pipe 4a of the intake cylinder of the cylinder that can be deactivated
On the side, an intake cutoff valve 30 is provided on the intake inlet side of the intake port 11a of the cylinder 11, that is, at the opening 11b of the intake port 11a in the intake manifold 2a, to cut off intake air.

As shown in FIGS. 3 and 4, the intake cutoff valve 30 is attached to a rotating shaft 31 supported in the intake manifold 2a with bolts or the like and protrudes, and is in close contact with the opening 11b of the intake port 11a. A sealing material 32 such as rubber is laminated on the portion. Also,
The rotating shaft 31 is connected to an actuator 35 such as an air cylinder through an arm 33 and a link 34 outside the intake manifold 2a, and is rotated by the reciprocating motion of the actuator 35 to open the opening 1.
1b can be opened and closed.

Opening/closing control of the intake cutoff valve 30, exhaust cutoff valve 23, and negative pressure cutoff valve 24 is performed by a cylinder number controller 20 shown in FIG. This cylinder number controller 20 receives an input signal L from a load sensor 16 attached to a governor 9 of a fuel injection pump 8, for example.
The load on the engine 1 is detected by the engine 1, and when the load falls below a set value, the fuel F is supplied from the fuel injection pump 8 to the fuel injection nozzle 10 provided in the cylinder head 1a of the engine 1. The pipe 15 is cut off by sending a close signal S to a fuel cutoff valve 21 installed in the middle thereof, and the supply of fuel F to the cylinder 11 is stopped. In the same building, the cylinder number controller 20 also sends a close signal S to the actuator 35 that opens and closes the intake cutoff valve 30 and the exhaust cutoff valve 23 to close the pipeline, and also sends an open signal 0 to the load cutoff valve 24. The cylinder 11 is connected to the vacuum tank 6 via the suction pipe 14.

As a result, when the engine 1 stops operating some of its cylinders, the inside of the exhaust manifold 3a, the inside of the cylinder 11 of the stopped cylinder, and the intake port 11a
The inside becomes almost a vacuum state with good response, and there is no air going in or out. Therefore, even if the intake and exhaust valves 12, 13 and piston 17 of the deactivated cylinder continue to operate, since the suction pressure is 0, these cylinders no longer perform pumping work and compression work, and the piston thrust force and conrod bearing Friction is also significantly reduced, and the inactive cylinders no longer place a load on the active cylinders.

[Effect of idea]

By configuring the cylinder number variable device of the present invention as described above, there is an effect that the inside of the cylinder of the cylinder whose operation has been stopped is brought into a substantially vacuum state in a short time. For this reason, there is an advantage that the time during which the deactivated cylinder becomes a load on the activated cylinder during transition to reduced-cylinder operation is shortened, and fuel efficiency can be improved.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the overall configuration of an embodiment of the cylinder number variable device of the present invention, and FIG. 2 is an illustration of an embodiment of the device shown in FIG.
An explanatory diagram showing the detailed configuration of the cylinders, Fig. 3 is a perspective view of the cylinder head with the intake manifold removed showing the structure of the intake cutoff valve, and Fig. 4 shows an engine equipped with the cylinder number variable device of the present invention. FIG. 3 is a longitudinal sectional view of the intake manifold section of FIG. 1... Engine, 2, 2a... Intake manifold, 3, 3a... Exhaust manifold, 4a... Intake pipe, 5, 5a... Exhaust pipe pipe, 6... Vacuum tank,
11...Cylinder, 11a...Intake port, 11
b opening, 14... Suction pipe, 15... Fuel supply pipe, 21... Fuel cutoff valve, 23... Exhaust cutoff valve,
24...Negative pressure cutoff valve, 30...Intake cutoff valve 31...
...Rotating shaft, 32...Sealing material, 33...Arm,
34...link, 35...actuator.

Claims (1)

[Scope of utility model registration request] A cutoff valve that closes when fuel supply is stopped is provided in each of the intake port opening and the exhaust pipe of the cylinder whose operation can be stopped in the engine with a variable number of cylinders, and the exhaust passage between the exhaust pipe cutoff valve and the exhaust valve is provided. suction tube,
A cylinder number variable device connected to a vacuum suction device via a suction pipe.