JPH0460118A - Supercharger - Google Patents

Abstract

PURPOSE:To improve the rising of rotational speed of an engine when an accelerator is ON by providing a clutch disengaged and a sub-throttle for reducing valve opening angle during an accelerator OFF and suppressing rapid increase in the rotational speed of a supercharger during the accelerator OFF. CONSTITUTION:When acceleration or deceleration running is required because of a vehicle running ahead, during climbing motion in an express highway, etc., since the rotational speed of an engine 2 tends to become slower than that of a supercharger 10 side in deceleration a one-way clutch 24 is disengaged, and a driving pulley 6, a belt 8, a pulley 12, and a supercharger 10 run in idle. Also, an OFF signal 28 of an accelerator pedal 20 makes the valve open angle of a sub-throttle 26 small. Namely, an amount of intake air is decreased so as not to produce surging by means of a backflow of supercharged air. Furthermore, when a throttle valve 22 is opened by an accelerator ON, again, the one-way clutch 24 engages, wherein the supercharger 10 reaches a required high speed rotation in a short time.

Description

[Detailed Description of the Invention] [Object of the Invention] (Field of Industrial Application) The present invention relates to a supercharger for an automobile, and in particular,
This relates to a supercharger equipped with a mechanism that idles when the accelerator is turned off.

(Conventional technology) An example of a conventional supercharger is shown in FIG.

The illustrated supercharger relates to a supercharger that is mechanically transmitted and driven using a rotating pulley on the engine crankshaft. That is, a drive pulley 6 is directly connected to the crankshaft 4 of the engine 2, and a pulley 12 on the supercharger 10 side is rotated via a belt 8. These two pulleys 6.12 are of an open/close type, and together with the belt 8 constitute a continuously variable transmission. When the supercharger 10 is driven by the pulley 12, external air is sucked in through the air cleaner 14, passes through the suction passage 16, and then is discharged into the discharge passage 18. The discharge passage 18 is provided with a throttle valve 22 that operates in conjunction with an accelerator pedal 20 to adjust the flow rate of air and supply it to the engine 2.

(Problem to be Solved by the Invention) However, according to the above-mentioned conventional technology, when accelerating and decelerating driving such as when driving uphill, there is a problem that the response of the engine to the accelerator operation during acceleration deteriorates. Ta.

That is, for example, when there are other cars running in front of a long climb on a highway, the engine output must be increased in order to climb the hill, and the accelerator is turned on. As a result, the vehicle's speed tends to increase and it approaches the vehicle in front. For this reason, the vehicle speed is reduced by warming up the accelerator or turning it off. This causes the engine speed to decrease and the supercharger to rotate as well.

Therefore, the engine speed also decreases further, and the vehicle speed also decreases. Therefore, the accelerator is turned on again, but at this time the rotation of the pulley on the supercharger side has become small, so turning on the accelerator does not immediately lead to an increase in engine speed.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a supercharger with good engine response during acceleration.

[Configuration of the Invention (Means for Solving the Problems) In order to solve the above problems, the configuration of the present invention is to provide a drive pulley to the engine crankshaft via a clutch that disengages when the accelerator is turned off, and to connect the drive pulley to the crankshaft of the engine. A pulley on the supercharger side that is driven by a belt is provided, and a sub-throttle that reduces the valve opening when the accelerator is off is provided in the suction passage of the supercharger.

(Function) When accelerating or decelerating, if you turn off the accelerator, the engine output will drop and the number of rotations will decrease, but the clutch installed on the crankshaft will be disengaged, and the drive pulley and supercharger side pulley will idle, causing the supercharger to shut off. The rotational speed does not suddenly decrease, and the supercharging pressure to the discharge passage does not suddenly decrease. In this state, when the accelerator is turned on next time, the supercharger, whose rotational speed has not dropped much, reaches the required high rotational speed in a short time and can send high boost pressure to the engine. Therefore, the responsiveness of the engine to the accelerator when the accelerator is turned on, that is, when accelerating, is improved.

(Example) Next, one embodiment of the present invention will be described based on FIG.

The figure shows an embodiment using a mechanically driven centrifugal supercharger 10 using pulleys 6 and 12 and a belt 8. A one-way clutch 24 is provided on the crankshaft 4 of the engine 2. Therefore, when the accelerator is turned on and the engine rotation is about to become faster than the rotation of the supercharger, the clutch is connected and the accelerator is turned on.
The clutch is designed to disengage when the engine becomes FF and the engine rotation becomes slower than the supercharger rotation. A drive pulley 6 is provided via this one-way clutch 24, and a pulley 12 on the supercharger 10 side is driven from this drive pulley 6 via a belt 8. When the pulley 12 rotates and the supercharger 10 is rotationally driven, external air is sucked into the suction passage 16 through the air cleaner 14. This suction passage 16 is provided with a sub-throttle 26, which is controlled to reduce the valve opening degree by a signal 28 when the accelerator is off. Air taken in through the subthrottle 26 is discharged into the discharge passage 18 with boost pressure. A throttle valve 22 is provided in this discharge passage, and is linked to the accelerator pedal 20 to open the valve according to the amount of depression of the accelerator pedal 20. Air with supercharging pressure is supplied to the engine 2 through the throttle valve 22.

Next, the operation of this embodiment will be explained. For example, when you are climbing a long hill on a highway and there are cars in front of you, you may need to accelerate and decelerate. That is, since the driver is going uphill, the accelerator is turned on and the throttle valve is opened to increase the rotational speed of the engine 2 in order to increase the output of the engine. As a result, the vehicle speed increases and the vehicle tends to approach the vehicle in front, so when the vehicle approaches, the accelerator is turned off and the vehicle speed is reduced. At this time, the rotation of the engine tends to become slower than the rotation of the supercharger 10, so the one-way clutch 24 is disengaged, and the drive pulley 6, belt 8, pulley 12, and supercharger 10 spin idly. Due to this idle rotation, the rotation of the supercharger]O does not suddenly decrease, and the supercharging pressure also does not decrease suddenly. In addition, the accelerator pedal 20
In response to the signal 28 indicating that the accelerator is depressed and the accelerator is turned off, the sub-throttle 26 also reduces its valve opening. As a result, even though the accelerator is turned OFF, the air sent from the supercharger 10 with supercharging pressure is pushed back by the throttle valve 22, which has a smaller valve opening, and flows backward, and this backflow causes Reduce the amount of air inhaled to prevent pulsation (surging).

In this state, when you depress the accelerator pedal 20 again to turn on the accelerator and open the throttle valve 22, the one-way clutch 24 is connected, and the supercharger 10, which had not slowed down much until then, reaches the required high rotation in a short time. , air with the necessary high boost pressure can be immediately supplied to the engine 2. At this time, the subthrottle sotol 26 receives the accelerator ON signal and increases the valve opening to increase the amount of air supplied.

As described above, when the accelerator is turned on, air with high boost pressure is supplied to the engine in a short period of time, so the engine can immediately reach high rotation speeds, improving the responsiveness of the engine.

In the above embodiment, the clutch is one-uni clutch 2.
4, and the rotation on the engine 2 side or the sparcharger 1
The clutch may be disengaged automatically when the rotation becomes slower than the 0-side rotation, or in other embodiments, an electromagnetic clutch may be used that disengages in response to an accelerator OFF signal when the accelerator is turned OFF.

[Effects of the Invention] As explained above, according to the configuration of the present invention, even when the accelerator is turned off during acceleration or deceleration, the rotational speed of the supercharger does not suddenly decrease, and the rotational speed of the supercharger does not suddenly become excessive. Since the boost pressure does not drop, the next time you turn on the accelerator, you can get the supercharger to the required high rotation speed in a short time, and high boost pressure can be sent to the engine in a short time. Improves the engine's response to the accelerator during acceleration.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional example. 2... Engine 4... Crankshaft 6... Drive pulley 8... Belt] 0... Supercharger 12... Pulley 14... Air cleaner] 6... Intake passage 18... Discharge passage 20...Accelerator pedal 22...Throttle valve 24...One-way clutch 26...Subthrottle

Claims (1)

[Claims] A drive pulley is connected to the engine crankshaft via a clutch that disengages when the accelerator is OFF, and a pulley on the supercharger side that is driven by the drive pulley via a belt is installed in the intake passage of the supercharger. A supercharger that features a sub-throttle that reduces the valve opening at times.