JPS59208138A - Power transmitting device for variable exhaust amount engine - Google Patents

Abstract

PURPOSE:To reduce vibration in converting the number of cylinders by providing a transmitting torque controlling means in a power transmitting device for an engine which is controlled with respect to the number of cylinders. CONSTITUTION:An electromagnetic clutch 6 is connected between an engine 1 and a transmission 8. When an electromagnetic clutch controlling unit 12 receives a number-of-cylinder converting signal a from a number-of-cylinder controlling unit 2, a value of clutch controlling current b is reduced and transient transmitting torque in the conversion of the number of cylinders is reduced for a predetermined time. Thus, the fluctuation of the transmitting torque is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power transmission device for a variable displacement engine that can increase or decrease the number of cylinders to which fuel is supplied depending on the engine load.

In general, fuel efficiency tends to be better when an engine is operated under high load conditions, but engines such as vehicle engines whose load conditions vary over a wide range cannot always be operated with good fuel efficiency. Therefore, in a low-load state where the engine load is below a certain value, the fuel supply to some groups of cylinders in a multi-cylinder engine, for example, 3 cylinders in a 6-cylinder engine, is cut off to stop the operation of these 3 cylinders. A variable displacement engine was devised in which the load of the reduced number of cylinders is transferred to the remaining three cylinders, thereby relatively increasing the load on the three operating cylinders and improving fuel efficiency. Specifically, in the case of an engine with a carburetor, 3 in the above example.
Partial cylinder operation is performed by keeping the intake and exhaust valves for each cylinder closed.

In this manner, conventional devices have attempted to reduce fuel consumption by performing partial cylinder operation when the engine is in a low load state such as during deceleration or low speed driving.

On the other hand, vibrations generated from the engine and power transmission system include vertical vibrations caused by the combustion stroke of the engine and rolling vibrations caused by fluctuations in engine rotation, and these vibrations tend to increase in inverse proportion to the number of cylinders in the engine. ! In addition, in a variable displacement engine, vibrations generated when changing the number of cylinders are added to the above-mentioned vibrations.

Conventionally, these vibrations have usually been countered by improving the way the engine is supported on the vehicle body, the flywheel, the clutch disk, etc. to absorb engine torque fluctuations.

Therefore, in order to reduce the above-mentioned vibrations in a variable displacement engine, the support part of the engine to the vehicle body must have a special structure, which complicates the support arrangement and restricts the arrangement within the engine room. There was a drawback.

In addition, since there is a limit to the vibration suppression effect of these support methods alone, there were drawbacks such as the need to create a special wall structure between the engine room and the passenger compartment to deal with abnormal noises emitted from the drive system.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and the above-mentioned vibrations can be suppressed by absorbing engine rotational fluctuations by having a configuration that includes means for controlling the transmission torque of the clutch when changing the number of cylinders. The object is to provide a power transmission device for a variable displacement engine.

An embodiment of the present invention will be described below with reference to the drawings.

The drawing shows an engine and a power transmission device according to an embodiment of the present invention. In the drawing, 1 is an engine, and 2 is a cylinder number control device, which together with the engine 1 constitutes variable displacement means 3 for the engine. There is. 4 is a crankshaft, 5 is a flywheel, 6 is an electromagnetic clutch that disconnects and connects the power generated from the engine 1, 7 is a clutch output shaft, 8 is a transmission, and 9 is a final reduction gear; 6. Power transmission device image 1 with transmission 8 and final reduction gear 9
It constitutes 0. 11 is a wheel driven by the power transmission device 10; 12 is an electromagnetic clutch that receives a cylinder number conversion signal a from the cylinder number control device 2 and outputs a control current for controlling the magnetic clutch 6; It is a control device.

Based on the above configuration, the operation of an embodiment of the present invention will be described.

When the cylinder number control device 2 detects whether the load state of the engine 1 has become a low load state or a high load state and converts the number of operating cylinders, it is output from the cylinder number dividing device 11 device 2. The cylinder number conversion signal a is selected using, for example, a signal whose voltage level is changed. The electromagnetic clutch control device 12 receives the cylinder number conversion signal a and reduces the value of the control current S for a predetermined period of time when the voltage level of the signal a changes. Since the electromagnetic clutch 6 can transmit torque proportional to the coil current flow value, the transmitted torque is controlled to be small by lowering the control current for a predetermined period of time, and the transient engine torque when changing the number of cylinders is reduced. It is possible to suppress fluctuations from being transmitted to the clutch output shaft 7.

As described above, according to one embodiment of the present invention, the transmission torque of the electromagnetic clutch 6 is controlled when changing the number of cylinders, and the rotational fluctuations of the power transmission system are absorbed, thereby suppressing vibrations generated from the engine and the power transmission system. You can.

Although the electromagnetic clutch 6 is used as the clutch in the above embodiment, a friction clutch or a fluid clutch may also be used.

Regarding the control method, in addition to the above-mentioned embodiments, there is a method in which engine vibration or torque is detected, and as these signals become larger, the transmitted torque becomes smaller.
Feedback control may also be used.

As explained above, according to the present invention, with the configuration provided with a means for controlling the transmission torque of the power transmission device, it is possible to reduce the vibration that occurs when changing the number of cylinders of a variable displacement engine and to reduce the strength of the transmission gear. Moreover, by reducing the weight of the power transmission device, fuel efficiency and cost can be reduced, and it also has practical effects such as not causing discomfort to the driver.

[Brief explanation of drawings]

The drawing is an overall configuration diagram showing an engine and a power transmission device according to an embodiment of the present invention. ■...Engine, 2...Cylinder number control device, 3...
Variable displacement means, 6... Electromagnetic clutch, 7... Clutch output shaft, 8... Transmission, 9... Final reduction gear, 1o
...Dynamic power transmission 1 all equipment i', j, 11...Wheel, 12
...Electromagnetic clutch control device: i/, L, a--cylinder number conversion signal, b--control current. “Yo” Gol! Masuo Oiwa235

Claims (1)

[Claims] A fuel supply device that controls the amount of fuel supplied according to the load condition of the engine; and a fuel supply device that divides the cylinders to which fuel is supplied by the fuel supply device into a plurality of groups and supplies fuel to some of the cylinder groups according to the load condition of the engine. In a variable displacement engine power transmission device comprising a cylinder number control device that cuts supply and a power transmission device that transmits the power of the engine to wheels, when the cylinder number control device converts the number of cylinders, the power transmission device A power transmission device for a variable displacement engine, comprising means for controlling transmission torque of the transmission device.