JPS5951143A - Noise shielding apparatus for variable cylinder number type engine - Google Patents

Abstract

PURPOSE:To prevent generation of intake blasting noise by installing an intake/exhaust valve operation detecting means onto a cylinder quantity controlled engine and allowing the stop of operation of an intake valve to precede during transition to the reduced- cylinder operation and allowing restoration of operation of an exhaust valve to precede during restoration to the whole-cylinder operation. CONSTITUTION:An intake valve operation sensor 21 is installed onto the locker arm 3 of an intake valve 2, and a cam nose sensor 22 is installed onto a cam 10, and an exhaust valve operation sensor 23 is installed onto the locker arm 13 of an exhaust valve 12, and the signal of each sensor is input into a calculation circuit part M. When a cylinder quantity controller 1 transmits a reduced-cylinder signal ''H'', the hydraulic tappet 5 of the intake valve is loaded onto the base dia 10b of the cam 10, and if lift is not performed, a solenoid valve 9 is first turned ON, and the hydraulic tappet 5 is put into inoperative state, and the intake valve is kept in closed state, and afterwards suspension of operation of the exhaust valve is permitted. Since the exhaust valve does not stop operation before the intake valve stops operation, generation of the noise due to blasting intake gas in the case when the cylinder quantity is varied can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sound insulation device for a variable cylinder engine, and more particularly, the present invention relates to a sound insulation device for a variable cylinder engine. This invention relates to a sound insulation device for a variable cylinder engine that prevents air blowback into the intake manifold caused by timing deviations in exhaust valve operation and the accompanying blowback noise.

In recent years, in multi-cylinder engines, fuel supply to some cylinders is cut off when the engine is running at low speeds and under light loads, and the intake and exhaust valves of those cylinders are stopped from operating to reduce the number of operating cylinders and improve fuel efficiency in the light load range. Improvements have been put into practical use.

However, in a variable cylinder engine such as the one described above, when the intake and exhaust valves are stopped and operated individually, the exhaust valve closes and stops when switching from the operating state to the stopped state, and the intake valve is still closed. When the air is in operation, as soon as the intake valve opens, the compressed air in the cylinder flows back into the intake pipe and expands, creating a loud blowback sound that can make the driver and passengers feel uneasy, and may harm people around them. It had the disadvantage of causing discomfort. Also, this blowback sound can be caused by the intake valve opening first, even when the stop air valve is activated.
There was a problem that occurred when the exhaust valve was closed and stopped.

SUMMARY OF THE INVENTION An object of the present invention is to provide an excellent sound insulation device that eliminates the above-mentioned conventional drawbacks and can suppress the generation of intake blowback noise when changing the number of operating cylinders in a variable cylinder engine.

The sound insulation device for a variable cylinder engine according to the present invention achieves the above object by causing the exhaust valves of the deactivable cylinders whose fuel supply is cut off by the cylinder number controller to be deactivated after the intake valves have completely stopped deactivating, and vice versa. The present invention is characterized in that the operation of the intake valves of the deactivated 1jJ cylinders whose fuel supply has been resumed is restored after the exhaust valves are fully restored.

Hereinafter, the present invention will be explained in detail using the drawings.

The figure is an explanatory diagram including a circuit diagram showing one embodiment of the configuration of a sound insulation device for an iJ variable cylinder engine according to the present invention.

1 is a cylinder number controller for a variable cylinder engine, which outputs a high level signal "H" when shifting to reduced cylinder operation depending on the engine operating state, and outputs a low level signal "L" when returning to full cylinder operation. It is designed to be output.

Reference numeral 2 denotes an intake valve for a cylinder whose operation can be stopped, and opens and closes an intake port (not shown) by rotation of a rocker arm O.

On this day, the lever arm 3 opens and closes the intake valve 2 using the hydraulic tappet 5 lifted by the cam nose IDa of the cam 10 provided on the camshaft 11; and the bushing rod 4.

Reference numeral 12 denotes an exhaust valve of a cylinder whose operation can be stopped, and similarly, an exhaust port (not shown) is opened and closed by rotation of a rocker arm 16. Cam 10 that opens and closes
Therefore, the lift timing of the hydraulic tappet 15 and bushing rod 14 by the cam nose 20a is different from that of the intake valve 2.

In the embodiment shown in this figure, the intake valve 2 and the exhaust valve 1
2 is operated by the hydraulic tappets 5 and 1 during reduced cylinder operation.
5, the suction and exhaust valve stop mechanism is not limited to this hydraulic tappet, but can be electrically operated to stop the operation of the suction and exhaust valves independently. It can be anything.

Now, the hydraulic tappets (5, 15) for stopping the operation of the intake and exhaust valves adopted in this embodiment are the hydraulic chambers (6, 15) inside the tappets.
16, pressure oil passages 8, 18 from an oil bong (not shown)
(Solenoid valves 9 and 19 are filled with high-pressure lubricating oil.
(off), the bushing rods 4, 14 are operated to be lifted by the rotation of the cam 10, 20 in the same way as a normal tappet. Then, when the solenoid valves 9 and 19 are turned on and the lubricating oil in the hydraulic chambers 6 and 16 is discharged, the hydraulic tappet 5.15 is not lifted by the cam noses 10a and 20a even if the cam 10.20 rotates. , the lubricating oil pressure is absorbed by the springs 7, 17 installed in the hydraulic chambers 6, 16 to which no lubricating oil pressure is applied, so that the bushing rods 4, 14 are not lifted, and the suction and exhaust valves 2.12 are not opened. In the valve operating mechanism of the intake valve 2 and the exhaust valve 12 configured as described above, the present invention controls the operation stop timing and operation recovery timing of the intake and exhaust valves, so that when the number of activated cylinders is changed, the operation of the cylinder whose operation is changed is controlled. The following sound insulation device is installed to prevent the compressed air generated within the cylinder from blowing back into the intake manifold. That is, this sound insulation device has a cam nose sensor 22 on the intake valve 2 side that detects a state in which the hydraulic tappet 5 is not lifted by the cam 10 (when the hydraulic tappet 5 is on the base diamond 1Ob of the cam 10). An intake valve operation sensor 21 is provided on the rotation circumference and detects the operating state of the intake valve 2 by the movement of the rocker arm 6. On the exhaust valve 12 side, the operating state of the exhaust valve 12 is also detected by the movement of the rocker arm 16. An exhaust valve operation sensor 23 is provided to constitute a detection section, and this detection section is connected to the arithmetic circuit section M to detect the electromagnetic valves 9, 19 is designed to output a signal for controlling opening/closing.

The cam nose sensor 22 is turned on when the hydraulic tappet 575 yaw is on the cam 10's slider 10b and outputs a no-level signal "Hn".
However, when the hydraulic tappet 5 is on the cam nose 10a, the off-site low level signal "L" is 114 degrees. Still, the intake valve operation sensor 21 and =IJl: The intake valve operation sensor 26 is pushed by the cam nose LOa, 20a to the bushing rod '4,1475''J,
When the exhaust valves 2 and 12 are in the open state, they are turned on and output a low level signal "H", and when the intake and exhaust valves 2 and 12 are in the closed state, they are turned off and a low level signal is output. "L'' is output.

The arithmetic circuit section M includes an AND circuit 24.2 as shown in the figure.
5.26, OR circuit 27, inno(-28゜29 arithmetic element combination power, 71 knob float)
Hereinafter referred to as F/F) 30.31 is driven and its output is amplified by an amplifier 3L32 to open and close the solenoid valves 9 and 19 of hydraulic tappet 5.15.

In the sound insulation device for a variable cylinder engine of the present invention configured as described above, first, when the cylinder number controller 1 outputs the cylinder reduction signal "H++", the inverter 28 causes the F/F
30 and the reset terminal R of the F/F 31 becomes "L". In this state, the output of the circuit 26 becomes "H" when the human power of the input circuit 29 is "L++", that is, O
When the inputs of the R circuit 27 are both L+1, when the hydraulic tappet 5 is operating, the sensor 21 and the sensor 22
Since the output is always reversed, while the hydraulic tappet 5 is in operation, the Q output of the F/F' 31 will not become "H" and the hydraulic tappet 15 will not stop its operation.

The output of the AND circuit 24 becomes "H"' when the force l·10
rotates and the hydraulic tappet 5 is connected to the base diamond 1 of the cam 10.
0b, and at this time, the set force S of the lever 60 becomes "H", its Q output also becomes H++, and the solenoid valve 9 is turned on. As a result, the solenoid valve 9 is turned on for the first time after the cylinder number controller 1 outputs the cylinder reduction signal "nu" and when the hydraulic tappet 5 is not lifted by riding on the base diamond 10b of the cam 10. The lubricating oil in the hydraulic chamber 6 is discharged, the hydraulic tappet 5 becomes inactive, and the intake valve 2 no longer opens.

As described above, in the present invention, when the cylinder number controller 1 outputs the cylinder reduction signal "H"', the intake valve 2 always stops its valve operation before the exhaust valve 12 does.

The antagonism valve 12 stops its operation when the cam 10 rotates after the lubricating oil in the hydraulic tappet 5 is discharged and its cam nose 10a attempts to lift the hydraulic tappet l-5. At this time, the sensor 22 is on the base diamond 10b of the cam 10 and becomes L ++, and the sensor 21
Also, the hydraulic tappet 5 is inoperative.'': The re-push rod 4 does not lift and becomes ``L'''. Therefore, the output of the OR circuit 27 is ``L'', the output of the inverter 29 is ``H'', and the two human forces are ``H''. 'The output of the AND circuit 26 becomes H'', the manual setting S of the F/F 31 becomes H++, the Q output becomes H, the solenoid valve 19 is turned on, and the hydraulic tappet 15 is also turned on. It will stop working.

Next, when the generous number controller 1 outputs the all cylinder operation signal "L++" from the reduced cylinder operating state, first the impark 2
8, the reset human power R of F/F filter 1 becomes "H",
Since the set force S becomes "L" by the AND circuit 26, the Q output of the F/F 31 immediately becomes "L++" and the solenoid valve 19 is turned off. In other words, the hydraulic tappet 15 returns to operation and the exhaust valve 12 is turned off first. It will return to operation.

However, for the intake valve 2, the output of the AND circuit 24 is
L'''F/F 30 set human power Sit''
”, but the reset human power R is ANT) Circuit 2
σ remains at "L" unless the output of No. 5 becomes "IT", and its operation does not return immediately. AND
The input connected to the inverter 28 of the circuit 25 has a
An "H" signal is inputted from the "L" output of the controller 1, but an "H" signal is not inputted to the other input connected to the sensor 26 unless the sensor 26 is turned on.

The sensor 26 turns on when the cam 20 rotates after the hydraulic chamber 16 of the hydraulic tappet 15 is filled with lubricating oil and the cam nose 20a lifts the bushing rod 14 via the hydraulic tappet 15. Therefore, in the present invention, when transitioning to all-cylinder operation, the exhaust valve 12 always returns to operation first, and then the intake valve 2 returns to operation.

As explained above, in this invention, means for detecting the movement state of the intake and exhaust valves of the deactivable cylinders of the variable cylinder engine is provided, so that the operation of the intake valves is always stopped when transitioning to reduced cylinder operation. By stopping the operation of the exhaust valve from the beginning of the engine, and then always restarting the exhaust valve and then the intake valve when returning to full-cylinder operation, the compressed air inside the cylinder is reduced when the number of cylinders is changed. This has the effect of completely eliminating the problem of air blowing back into the intake manifold, and eliminating the generation of loud blowback noise. Therefore, there is an advantage that the driver, passengers, etc. do not feel uneasy due to the blowback sound when changing the number of cylinders of the engine, and can continue to drive the vehicle safely.

Furthermore, in this invention, the suction and exhaust valves are not stopped and restarted at the same time, but are always performed one at a time, so when fluid is used to change the operation of the suction and exhaust valves, the unit of the working fluid is Since the required supply amount per hour is reduced to half, the suction and exhaust valve stop mechanisms and response speed can be improved, and the diameter of the working fluid supply pipe can be made smaller.

BRIEF DESCRIPTION OF THE DRAWINGS The figure is an explanatory diagram including a circuit diagram showing one embodiment of the configuration of a sound insulation device for a variable cylinder engine according to the present invention. 1... Number of cylinders) o-ra, 2... Intake valve, 3.1
3...Rocker arm, 4.14...Butch rod, 5゜15...Hydraulic pet, 8,18...Pressure oil passage, 9.19...Solenoid valve, 10.20...Cam ,1
0a, 20a...Cam nose, 10b...Base diamond, 12...Exhaust valve, 21...Intake valve operation sensor, 22...Cam nose sensor, 26...Exhaust valve operation sensor, 24. 25.26...AND circuit, 27.
...OR circuit, 28t29...Inverter, 30, 3
1...Flip-flop. Agent: Patent Attorney Makoto Ogawa - Patent Attorney: Masaru Noguchi Patent Attorney: Kazuhiko Saishita Procedural Amendment 1. Display of the case 1981 Patent application No. 1622
31;;2, Name of the invention ++ Sound insulation device for J variable cylinder engine 3, 19th century with the person making the amendment 'I+I'l Patent applicant 4, agent fl' Location 105 East JJ Partial Port 1 I West Analysis bridge 3
Ding IJ: 3#3j; Pelican Building (1) Specification No. 8
Page 1st line [Amplifier 31, 32 J] [Amplifier 32, 33 J
and correct it.

Claims (1)

[Claims] Depending on the operating status of the engine, the cylinder number controller can cut off the supply of fuel to some cylinders, and
In a variable cylinder engine that is configured to perform reduced-cylinder operation by deactivating the exhaust valve, a means for detecting the movement state of the intake and exhaust valves of the cylinders that can be deactivated is provided, and when transitioning to reduced-cylinder operation, the intake valve When the stop of operation of the exhaust valve is detected by the means, the stop of operation of the exhaust valve is suspended, and when returning to full-cylinder operation, the return of operation of the intake valve is suspended until the return of operation of the exhaust valve is detected by the means. A sound insulation device for a variable cylinder engine characterized by: