JPS60104422A - Supporting method of internal-combustion engine for cylinder number control vehicle - Google Patents

Abstract

PURPOSE:To reduce rolling due to exchange of operating condition by supporting an internal-combustion engine through a vibration isolating rubber having constant spring constant, thereby assuring proper dynamic spring constant suitable for both partial cylinder operation and full-cylinder operation. CONSTITUTION:A part of multi-cylinders is operated or partial cylinder operation is executed (by means of independent controller) under idling and low speed light load operation where the internal-combustion engine is secured through bolts 3 while an open path 11 of vibration isolating rubber equipment 32 to be secured through bolts 4 will open toward the chassis frame to provided low dynamic spring constant. While full-cylinder operation is performed under load operation at the start and acceleration to close said path 11 thus to increase the dynamic spring constant of said vibration isolating rubber equipment and to increase the viscosity damping factor resulting in effective reduction of engine shake or rolling.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a support method for supporting a cylinder-controlled internal combustion engine used in a vehicle such as an automobile from a vehicle body, and particularly relates to a support method for supporting a cylinder-controlled internal combustion engine used in a vehicle such as an automobile, particularly during partial cylinder operation, full-cylinder operation, and The present invention relates to a support method for appropriately supporting an internal combustion engine from a vehicle body in order to prevent vibrations when switching operating states between full cylinder operation and partial cylinder operation.

BACKGROUND OF THE INVENTION As an internal combustion engine used in vehicles such as automobiles, when the engine load is small, such as during idling or low load operation, partial load operation is performed using only a specific cylinder out of a plurality of cylinders. When the engine load is large, such as during negative direction operation, cylinder fli control (for internal combustion engines) is conventionally known in which all of the plurality of cylinders are used to perform Ij cylinder operation.

In the above-mentioned cylinder-controlled internal combustion engine, the frequency and vibration level of vibrations excited by the internal combustion engine differ between partial cylinder operation and full cylinder operation even if the engine speed is the same. Therefore, the optimal characteristics of the anti-vibration rubber device that supports the internal combustion engine from the vehicle body are different between partial-cylinder operation and full-cylinder operation, and during idle operation with partial cylinder operation, low-frequency vibrations that cause idle vibration and noise are generated. In order to effectively reduce small-amplitude vibrations, it is preferable that the dynamic spring constant of the vibration-isolating rubber device is particularly small.On the other hand, when driving with all cylinders operating, the vibration-isolating rubber device is used to reduce large-amplitude vibrations such as engine shake. It is preferable that the dynamic spring constant and damping coefficient of is large.

In addition, in the above-mentioned cylinder-controlled internal combustion engine, when switching between all-cylinder operation and partial-cylinder operation, especially when switching from partial-cylinder operation to all-cylinder operation due to sudden acceleration, torque fluctuations in the internal combustion engine The internal combustion engine is susceptible to large swings in the rolling direction, a so-called jerk. In order to reduce this jerk, the dynamic spring constant of the vibration isolating rubber device is large.
It is preferable that the supporting rigidity of the internal combustion engine in the rolling direction is high.

Purpose of the Invention In view of the above-mentioned requirements for supporting the vehicle body of a cylinder-controlled internal combustion engine, the present invention provides a support that appropriately supports a cylinder-controlled internal combustion engine from the vehicle body in accordance with the operating state for vibration isolation. The purpose is to provide a method.

According to the present invention, partial cylinder operation is performed using only a specific cylinder among a plurality of cylinders when the engine load is small, and when the engine load is large, the above-mentioned object is to The vehicle internal combustion engine is supported by the vehicle body in full cylinder operation using all of the cylinders. This is achieved by a method of supporting a cylinder-controlled internal combustion engine, which reduces the dynamic spring constant of the vibration-isolating rubber device and increases the spring constant of the vibration-isolating rubber device during full-cylinder operation.

Effects of the Invention According to the method for supporting an internal combustion engine according to the present invention, during partial cylinder operation, low frequency and small amplitude vibrations are effectively damped due to the small dynamic spring constant of the vibration isolating rubber device, and idle vibrations and The noise inside the vehicle interior 19j is reduced, and on the other hand, during full-cylinder operation, the dynamic spring constant of the anti-vibration rubber device is large, so that large-amplitude vibrations such as engine shake are effectively reduced.

According to another feature of the present invention, the dynamic spring constant of the vibration isolating rubber device that supports one calling motion of the internal combustion engine among the vibration isolating rubber devices when switching the operating state between full cylinder operation and partial cylinder operation is provided. In addition, the support rigidity of the internal combustion engine in the rolling direction is increased, and so-called shakiri, in which the internal combustion engine swings greatly in the rolling direction when switching the operating state, is reduced. .

DESCRIPTION OF EMBODIMENTS The present invention will now be described in detail with reference to embodiments with reference to the accompanying drawings.

FIG. 1 shows one embodiment of a cylinder-controlled vehicular internal combustion engine to which the support method according to the present invention is applied. Although not shown in the figure, the internal combustion engine 30 shown in FIG. 1 has a plurality of cylinders, for example, four cylinders, and each cylinder is provided with a The fuel 1 is individually injected from the fuel injection valve 31. It is designed to be supplied with J-shot. The fuel 1 injection valve 31 operates based on an electrical control signal that controls the output of a control device 11, which will be described later. Achieves partial cylinder operation in which only the cylinder and No. 4 cylinder operate,
In other operating ranges, all cylinders are activated to achieve an all-cylinder operation in which all cylinders are activated.

The internal combustion engine 30 is elastically supported by a plurality of anti-vibration rubber devices from the vehicle body (not shown), and in FIG. Only the anti-vibration rubber device 32 is shown.

The vibration isolating rubber device 32 has a dynamic spring constant and a damping coefficient v1. An example of this vibration isolating rubber device is shown in FIGS. 2 and 3.

The vibration isolating rubber device 32 shown in FIGS. 2 and 3 consists of 11 parts (not shown), which are fixed to a bracket 33 fixed to the outer wall of the internal combustion engine 30 by a frame 1 and a bolt 4 fixed to a pole 1 by a bolt 4. It has a frame body 2 fixed to.

While the frame 1 is composed of one cup-shaped member, the frame 2 is composed of a cylindrical member 2a, an end cover member 2b that closes one end of the cylindrical member, and an intermediate portion within the cylindrical portion jrA 2 a. and a partition plate 2C provided across the partition plate. The frame 1 is arranged concentrically at one open end of the cylindrical part +42a of the frame 2, and the frame 1 and the cylindrical member 2a are made of rubber or rubber-like material provided between them. They are connected to each other by annular wall elements 5 made of rubber-like elastic material. The partition plate 2c cooperates with the frame 1, the cylindrical member 2a and the annular wall element 5 to delimit a chamber space 6 on one side, i.e. upwardly in the figure, and on the other side. The cylindrical member 2a and the end cover member 2 are placed on the side, that is, downward in the figure.
b defines another chamber space, the outer peripheral edge of which is supported by the frame 2, and a diaphragm 7 made of rubber or a rubber-like product forms two further chamber spaces 8. It is divided into 9 categories.

In the partition plate 2C, an open passage 10 having a relatively large circular cross section and an open passage 11 having a crescent-shaped cross section are arranged in parallel. The openings 10 and 11 each open the chamber space 6 to another chamber space 8 outside the chamber space 6.

The chamber spaces 6 and 8 and the open passages 10 and 11 are filled with a liquid having a suitable viscosity.

A movable aperture plate 12 is provided in the open passage 10, and the movable aperture plate has a position where one plate surface abuts a step wall 13 provided in the middle of the open passage 10 by a partition plate 2C, and a position where the other plate surface abuts a step wall 13 provided in the middle of the open passage 10. An annular press plate 14 whose plate surface is attached to the partition plate 2C
The open passage 10 is movable in the vertical direction as shown in the figure between the position where it abuts one of the plate surfaces of the A plurality of throttling notches '15 defining throttling passages are provided at the outer circumferential edge in the middle. The movable aperture plate 12 is made of a material having a specific gravity approximately equal to the specific gravity of the sealed liquid, and when no vibration is input to the vibration isolating rubber device, the movable aperture plate 12 is made of a material that has a specific gravity approximately equal to the specific gravity of the sealed liquid. The opening passageway 10 is also located at a distant intermediate position so as not to substantially restrict the open passageway 10.

A slide-type valve element 16 supported by a partition plate 2C is installed in the middle of the open passage 11, and the valve element opens and closes the open passage 11 by moving left and right in the figure. There is. The valve element 16 is drivingly connected by a valve shaft 17 to a solenoid device 18 mounted on one side (=t i ) of the frame body 2 .

The solenoid 18 includes an electromagnetic coil 20 fixed to one solenoid case, a core 21 attached to the end of the valve stem 17, and a return spring 22, and returns to its original state when the electromagnetic coil 20 is not energized. The spring force of the spring 22 drives the valve element 16 together with the valve stem 17 to the right in the figure to close the open passage 11; on the other hand, when the electromagnetic coil 20 is energized, the spring force of the return spring 22 drives the valve element 16 to the right in the figure. 21 is magnetically attracted to drive the valve element 16 together with the valve shaft 17 to the left in the figure, thereby closing the open passage 11.

The electromagnetic coil 20 is energized by a control device that will be described later.

FIG. 4 shows an embodiment of a control device that controls the operation of the fuel injection valve 31 and the supply of electricity to the solenoid 20.

The control unit includes a conventional microphone 1'' computer 34. The microcomputer 34 receives information regarding the throttle opening of the internal combustion engine 30 from the throttle opening sensor 35, information regarding the rotational speed of the crankshaft of the internal combustion engine 30 from the rotational speed sensor 9-36, and information regarding the rotational speed of the crankshaft of the internal combustion engine 30 from the rotational speed sensor 9-36.
J-37, l, information regarding the intake pipe negative pressure of the internal combustion engine 30 is provided by the vehicle speed sensor 38, and the engine rotation speed detected by the rotation speed sensor 36 and the intake pipe negative pressure sensor 37. The fuel injection amount is determined based on the detected IC intake pipe negative pressure, and a signal accordingly is output to the drive station 39 of the fuel injection valve 31, and the flowchart shown in FIG. Accordingly, an electrical control signal is output to the drive device 39 and the drive device 30 of the solenoid 20 based on the information from each sensor in order to control switching between full cylinder operation and partial cylinder operation and control energization to the solenoid 20. It has become.

Next, an embodiment of a method for supporting a cylinder-controlled vehicular internal combustion engine according to the present invention will be described with reference to the flowchart shown in FIG.

The flowchart routine shown in FIG. 5 is repeatedly executed at predetermined time intervals or for each predetermined crankshaft, and in the first step 1, it is determined whether the internal combustion engine 30 is starting A determination is made. When it is time to start, the process proceeds to step 2, whereas when it is not time to start, the process proceeds to step 5.

In step 2, it is determined whether flag F is 1 or not. When F=1, the process proceeds to step 3. However, when F=1, the process proceeds to step 3.

In step 3, the solenoid 20 is energized, the valve element 16 is turned on, and the open passage 11 is closed. After step 3, proceed to step 4.

In step 4, a switch is made from partial cylinder operation to full cylinder operation. This allows the fuel injection valves 3 of all cylinders to
1 is activated and operation is performed using the gold cylinder. Also, in step 4, flag F is set to 1. The next step after step 4 is a reset.

In step 5, it is determined whether or not the vehicle is in idle operation. Step 8 when idle operation
If not, proceed to step 6.

In step 6, it is determined whether or not the vehicle is in acceleration operation. If it is during acceleration operation, proceed to step 2,
On the other hand, if the vehicle is not in acceleration mode, the process proceeds to step 7.

In step 7, it is determined whether or not the vehicle is operating at low speed and low load. If the operation is at low speed and low load, proceed to step 8; if the operation is not at low speed and low load, proceed to step 2.
Proceed to.

In step 8, it is determined whether flag F is 1 or not. When F=1, proceed to step 9,
It is reset when F=1.

In step 9, a switch is made from full cylinder operation to partial cylinder operation. At this time, the fuel injector 3 of a specific cylinder
Only one cylinder is activated, and partial cylinder operation is performed using only a specific cylinder. After step 9, proceed to step 10.

In step 10, the power supply to the solenoid 20 is stopped and the open passage 11 is opened. Also step 10
In this case, flag F is set to O. Next, in step 10, reset 1~ is performed.

By executing the routine as described above, partial cylinder operation is executed during idle operation and low speed and low load operation, and at this time, the open passage 11 of the vibration isolating rubber device 32 is opened. Therefore, at this time, the dynamic spring constant of the vibration isolating rubber device 32 becomes low, and idling vibration and noise are effectively reduced.On the other hand, during startup, acceleration operation, and load operation other than low speed and low negative direction, all cylinders are The operation is performed, and the open passage 11 is closed accordingly. Therefore, during all-cylinder operation, the dynamic spring constant of the vibration-proof rubber device 32 is kept high, and the viscous damping coefficient of the vibration-proof rubber device 32 is increased, so that engine shake and jerking are effectively reduced.

Furthermore, when switching between the partial cylinder operation and the full cylinder operation, the solenoid 20 is energized, the open passage 11 is closed by the valve element 16, and the dynamic spring constant and viscous damping coefficient of the vibration isolating rubber device 32 are changed. (This prevents the internal combustion engine from fluctuating greatly due to torque fluctuations when switching operating conditions as described above.

The present invention has been described in detail with respect to specific embodiments.
However, it will be obvious to those skilled in the art that the present invention is not limited thereto, and that various embodiments are possible within the scope of the present invention.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing one embodiment of a mass-controlled vehicular internal combustion engine to which the support method according to the present invention is applied, and FIG. A vertical cross-sectional view showing one embodiment of the swinging rubber device, FIG. 3 is taken along line I in FIG.
4 is a block diagram showing an example of a control device used to carry out the supporting method according to the present invention, and FIG. 5 is a flowchart showing an embodiment of the supporting method according to the present invention. be. 1.2... Frame body, 3.4... Bolt, 5... Annular wall element, 6... Chamber space, 7... Diaphragm, 8.
9...Room space, 10.11...Open passage 912...
・Movable aperture plate. DESCRIPTION OF SYMBOLS 13... Step wall, 14... Holding plate, 15... Comparison notch, 16... Valve element, 17... Valve stem, 18... Solenoid device. 19... Solenoid case, 20... Electromagnetic coil,
21... Core, 22... Return spring, 30... Internal combustion engine, 31... Fuel injection valve, 32... Vibration isolating rubber device, 33... Bracket 1-, 34... Microphone 1" Computer, 35... Throttle opening sensor, 36...
・Rotational speed sensor → No, 37...Intake pipe negative pressure sensor, 3
8... Vehicle speed sensor v, 39.40... Drive device Fig. 1 Fig. 2 Fig. 3 a

Claims (2)

[Claims] (1) For vehicles that perform partial cylinder operation using only a specific cylinder among multiple cylinders when the engine load is low, and perform full cylinder operation using all of the multiple cylinders when the engine load is large. The internal combustion engine is supported from the vehicle body by a vibration isolating rubber device with a variable dynamic spring constant, and during partial cylinder operation, the dynamic spring constant of the vibration isolating rubber device is reduced, allowing full cylinder operation. A method for supporting a cylinder-controlled internal combustion engine for a vehicle, characterized in that the dynamic spring constant of the vibration isolating rubber device is sometimes increased. (2) For vehicles that perform partial cylinder operation using only a specific cylinder among the plurality of cylinders when the engine load is small, and perform full cylinder operation using all of the plurality of cylinders when the engine load is large. The internal combustion engine is supported from the vehicle body by a vibration isolating rubber device whose dynamic spring constant changes, and during partial cylinder operation, the dynamic spring constant of the vibration isolating rubber device is reduced, and full cylinder operation is performed. 1. A method for supporting a cylinder-controlled internal combustion engine for a vehicle, characterized in that the dynamic spring constant of the vibration isolating rubber device is increased when switching operating states between and partial cylinder operation and during full cylinder operation.