JPH0828285A - Intake device for engine having supercharger - Google Patents

Abstract

PURPOSE:To improve output through the increase in filling efficiency, to automatically operate a supercharger through drive operation by an operator, and besides to improve responsiveness. CONSTITUTION:In the intake device of an engine 2 having a supercharger 1, a throttle valve 10 is arranged in the intake air system 4 of the engine 2, and a supercharge control valve 11 is arranged downstream from the throttle valve 10. A spot situated upper stream from the supercharge control valve 11 and a spot situated downstream therefrom are intercommunicated, and a supercharger 1 to control the pressure in a position situated downstream from the supercharge control valve 11 is provided. A throttle valve 10 is opened according to an acceleration stroke and controlled in such a manner that the supercharge control valve 11 is closed with the increase of the acceleration stroke from the vicinity of the full opening position of the throttle valve 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake system for an engine equipped with a supercharger which performs air compression by a supercharger of an intake system.

[0002]

2. Description of the Related Art For example, some vehicles and the like are provided with a throttle valve in the intake system of the engine and open the throttle valve in conjunction with the accelerator stroke to control the intake air amount. Then,
The intake amount of air increases and the output increases.

[0003]

By the way, the throttle valve is in the fully open position when an engine with a small displacement is used in a high load range, as compared with a case where an engine with a large displacement having the same running resistance is operated with a throttle valve throttled. Since it is in the vicinity, throttle loss is small and fuel consumption can be reduced. However, the output becomes insufficient when accelerating or when high output is required such as uphill.

Therefore, for example, the intake system is provided with a supercharger,
It is conceivable that this supercharger will compress the intake air to allow more air to be sucked in and increase the charging efficiency to improve the output. When high output is required at times such as when climbing a hill or the like, supercharging can be automatically performed by the driver's driving operation, and responsiveness is required.

The present invention has been made in view of the above points, and can improve the output by increasing the charging efficiency, and can automatically perform supercharging by the driver's driving operation. An object of the present invention is to provide an intake device for an engine including a supercharger with improved responsiveness.

[0006]

In order to solve the above-mentioned problems, an intake system for an engine including a supercharger according to a first aspect of the present invention is provided with a throttle valve in an intake system of the engine, and a throttle valve is provided downstream of the throttle valve. Is provided with a supercharging control valve, the upstream side and the downstream side of the supercharging control valve are connected to each other, and a supercharger for controlling the pressure on the downstream side of the supercharging control valve is provided. It is characterized in that the supercharging control valve is controlled to open in response to the full-open position of the throttle valve and to close the supercharging control valve as the accelerator stroke increases.

According to another aspect of the present invention, in an intake system for an engine equipped with a supercharger, the supercharging control valve is controlled to be closed from before the fully open position of the throttle valve as the accelerator stroke increases. It is characterized by doing.

[0008]

According to the first aspect of the invention, the throttle valve is opened and output is controlled in conjunction with the accelerator stroke.
By closing the supercharging control valve from near the fully open position of the throttle valve as the accelerator stroke increases, it switches from natural intake operation to supercharging operation, and further,
Output control of supercharging operation is performed.

Therefore, the output of the engine with a small displacement is controlled by controlling the supercharging pressure when the throttle valve is fully opened at the time of high output such as acceleration or uphill driving. Therefore, the intake resistance of the air when the throttle valve is fully opened is controlled. It can be used in a high load range where the fuel consumption is small, the throttle loss is small, and the fuel consumption can be reduced. Moreover, when acceleration or high output such as climbing is required, the driver operates the accelerator,
Since the operation is switched from the naturally aspirated operation to the supercharging operation, and the output control of the supercharging operation is performed, the sensation that the throttle valve opens will be obtained.

According to the second aspect of the present invention, the supercharging control valve is closed from before the fully open position of the throttle valve as the accelerator stroke increases. Therefore, the responsiveness of the supercharger is improved and the throttle of the driver is increased. A high output that matches the operation feeling can be obtained.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an intake system for an engine equipped with a supercharger according to the present invention will be described below with reference to the drawings. 1 to 3 are views showing an operating state of an intake device of an engine including a supercharger, FIG. 1 is an operation diagram in a low load region, FIG. 2 is an operation diagram in a partial region of a supercharging control valve, and FIG. [Fig. 4] Fig. 4 is an operation diagram of a fully closed region of the feed control valve, Fig. 4 is a timing chart showing an operating state of an intake device of an engine having a supercharger, and Fig. 5 is an output showing an operating state of an intake device of an engine having a supercharger. It is a characteristic diagram.

A four-cylinder engine is used as the engine 2 having the supercharger 1, an exhaust system 3 is provided on one side, and an intake system 4 is provided on the other side. The exhaust pipes 5 of the exhaust system 3 are connected to the cylinders of the engine 2, respectively.

The surge tank 6 of the intake system 4 is connected to each cylinder of the engine 2. An air cleaner 8 and an air flow meter 9 are provided upstream of an intake pipe 7 connected to the surge tank 6 and downstream of the air flow meter 9. A throttle valve 10 is provided on the side, and a supercharging control valve 11 is provided on the downstream side of the throttle valve 10, and the supercharging control valve 11 is located at the inlet of the surge tank 6.

The exhaust pipe 5 and the surge tank 6 are the exhaust return pipe 1
EGR provided in the exhaust return pipe 12 that is communicated with
By controlling the valve 13, an EGR system 28 which returns a part of the exhaust gas to the surge tank 6 is provided.
The operation of system 28 is designed to reduce exhaust nitrogen oxides.

A supercharger 1 is provided between the throttle valve 10 and the supercharge control valve 11 via a supercharge inlet pipe 14.
Is connected, and the supercharger 1 is connected to the surge tank 6 via a supercharge outlet pipe 16. The supercharging inlet side pipe 14 is provided with a supercharging inlet valve 17, and the supercharging inlet side pipe 14 downstream of the supercharging inlet valve 17 is the bypass pipe 1.
It communicates with the supercharging discharge side pipe 16 via 8. The bypass pipe 18 is provided with a bypass valve 19, and the supercharging / delivery side pipe 16 is provided with an intercooler for cooling.

The pulley 21 of the supercharger 1 is connected to the pulley 23 of the engine 2 via the belt 22, and the supercharger 1 is driven by the power of the engine 2 by connecting the supercharging clutch 24.

Next, the operation of the engine 2 provided with the supercharger 1 will be described. The engine 2 including the supercharger 1 is shown in FIG.
As shown in FIG.

That is, the region where the stroke of the accelerator 30 is from point A to point C is the operating state of the low load region shown in FIG. This low load region is a region up to the point C where the bypass valve 19 is closed and the supercharge inlet valve 17 is opened.
The supercharging inlet valve 17 of the supercharging inlet side pipe 14 is fully closed, and the bypass valve 19 is fully open.

When the stroke of the accelerator 30 is B, the supercharging clutch 24 is turned on, but the supercharging inlet valve 17 of the supercharging inlet side pipe 14 is fully closed, and the bypass valve 19 is fully open. The feeder 1 is in a driving state, but there is no air compression.

Further, the supercharging control valve 11 is fully opened, the output of the engine 2 is controlled only by the throttle valve 10, and the low load region characteristic T1 as shown in FIG. 5 is obtained.
At this time, the EGR valve 13 opens and the EGR system 2
8 works.

Next, the region where the stroke of the accelerator 30 is from point C to point E is the operating state of the partial region of the supercharging control valve shown in FIG. In this supercharging partial region, the bypass valve 19 is closed, the supercharging inlet valve 17 is fully opened, and the supercharging control valve 11 is controlled to be closed in the vicinity of the fully opened position of the throttle valve 10 as the accelerator stroke increases. Is. Supercharging side pipe 14
The supercharging inlet valve 17 is fully opened, the bypass valve 19 is fully closed, the supercharging clutch 24 is ON, the supercharger 1 is in a driving state, and air compression is performed.

As for the output of the engine 2, the throttle valve 10 is fully opened at the stroke point t2, and the supercharging control valve 11 is at the stroke point t1 before the stroke point t2.
Is controlled so as to close, and air compression is performed by driving the supercharger 1 to obtain the supercharging control valve partial region characteristic T2 as shown in FIG. At this time, the EGR valve 13
Opens and the EGR system 28 is activated.

Next, the region where the stroke of the accelerator 30 is point E is the operating state of the supercharging control valve fully closed region shown in FIG. This supercharging control valve is fully closed, bypass valve 1
9 is closed, the supercharge inlet valve 17 is fully opened, and the supercharge control valve 11 is fully closed. Since the supercharging inlet valve 17 of the supercharging inlet side pipe 14 is fully opened and the supercharging clutch 24 is ON, the supercharger 1 is driven and air is compressed.

As for the output of the engine 2, the throttle valve 10 is fully open, the supercharging control valve 11 is fully closed, and due to the supercharging pressure, the supercharging control valve fully closed region characteristic as shown in FIG. Get T3. At this time, the EGR valve 1
3 is closed and the EGR system 28 is deactivated.

As described above, the throttle valve 10 is controlled to open and output in association with the accelerator stroke of the accelerator 30, but the supercharging control valve 11 is opened from near the fully opened position of the throttle valve 10 as the accelerator stroke increases. By closing, the natural intake operation is switched to the supercharging operation, and output control of the supercharging operation is further performed.

Therefore, the output of the engine having a small displacement is controlled by controlling the supercharging pressure when the throttle valve 10 is fully opened when high output such as acceleration or climbing is required. It can be used in a high load range where the suction resistance is small, throttle loss is small, and fuel consumption can be reduced. Moreover, when acceleration or high output such as uphill is required, the driver operates the accelerator 30 to switch from the naturally aspirated operation to the supercharged operation,
The output control of the supercharging operation is performed, and the sensation that the throttle valve 10 opens as it is can be obtained.

Further, since the supercharging control valve 11 is closed as the accelerator stroke increases from the stroke point t1 before the stroke point t2 at the fully opened position of the throttle valve 10, the response of the supercharger 1 is improved. A high output that matches the driver's feeling of throttle operation can be obtained.

[0028]

As described above, according to the first aspect of the present invention, the throttle valve is controlled to open and output in association with the accelerator stroke. However, the accelerator stroke of the supercharging control valve is increased from near the fully opened position of the throttle valve. Since it closes in response to this, the natural aspiration operation is switched to the supercharging operation, and output control of the supercharging operation is performed.

Therefore, the output of a small displacement engine is controlled by controlling the supercharging pressure when the throttle valve is fully opened when high output is required during acceleration or when climbing uphill. Therefore, the intake resistance of the air when the throttle valve is fully opened is controlled. It can be used in a high load range where the fuel consumption is small, the throttle loss is small, and the fuel consumption can be reduced. Moreover, when acceleration or high output such as climbing is required, the driver operates the accelerator,
The operation is switched from the natural intake operation to the supercharging operation, and the output control of the supercharging operation is further performed, so that the sensation that the throttle valve opens can be obtained.

According to the second aspect of the present invention, the supercharging control valve is closed from before the fully open position of the throttle valve in response to an increase in the accelerator stroke, so that the responsiveness of the supercharger is improved and the throttle for the driver is increased. A high output that matches the operation feeling can be obtained.

[Brief description of drawings]

FIG. 1 is an operation diagram of a low load region of an intake device of an engine including a supercharger.

FIG. 2 is an operation diagram of a partial region of a supercharging control valve of an intake device of an engine including a supercharger.

FIG. 3 is an operation diagram of a supercharging control valve fully closed region of an intake device of an engine including a supercharger.

FIG. 4 is a timing chart showing an operating state of an intake device of an engine including a supercharger.

FIG. 5 is an output characteristic diagram showing an operating state of an intake device of an engine including a supercharger.

[Explanation of symbols]

 1 supercharger 2 engine 4 intake system 10 throttle valve 11 supercharging control valve

Claims (2)

[Claims] 1. A throttle valve is provided in an intake system of an engine, a supercharging control valve is provided downstream of the throttle valve, and an upstream side and a downstream side of the supercharging control valve are communicated with each other. A supercharger for controlling the pressure on the downstream side is provided, and the throttle valve is opened according to the accelerator stroke, and the supercharge control valve is closed from near the fully opened position of the throttle valve as the accelerator stroke increases. An intake system for an engine including a supercharger which is controlled to 2. The engine with a supercharger according to claim 1, wherein the supercharging control valve is controlled so as to be closed from before the fully opened position of the throttle valve in response to the increase in the accelerator stroke. Intake device.