JP2594972Y2 - Engine intake system - Google Patents

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, and more particularly, to a structure in which an intake port passage is divided into two passages so as to be drawn into a combustion chamber from one or both passages depending on engine operating conditions. The present invention relates to an intake device for an engine.

[0002]

2. Description of the Related Art As means for improving the combustion of an engine,
2. Description of the Related Art Conventionally, there are various intake devices that divide a passage in an intake port into two passages to change the flow of an intake flow according to engine operating conditions, or to generate a swirl flow such as a tumble or swirl in a mixture flow drawn into a combustion chamber. Proposed.

FIG. 2 shows an example of the prior art, which shows an engine intake system disclosed in Japanese Patent Application Laid-Open No. 63-25317. As shown in the figure, an intake port opening to a combustion chamber is shown in FIG. 21 with a partition 22 in the passage,
A first passage 23 having a large passage cross-sectional area in the passage;
A second passage 24 having a smaller passage cross-sectional area is defined, and a shutter valve 25 for opening and closing the passage is provided in the first passage 23 to open and close the shutter valve 25 so that the flow of the intake air flow can be controlled by the engine operation. It changes according to conditions. In the case of this prior art, when the shutter valve 25 is in a fully opened state, fuel injected into the port from the injector 26 interferes with a part of the shutter valve 25 to promote atomization of the fuel.

A conventional example shown in FIG.
No. 334 has proposed this. According to this prior art, in a passage of an intake port 33 opened into a combustion chamber 32 via an intake valve 31, a partition wall 36 for dividing the passage into two layers and one end is pivotally supported by the passage wall surface. A reed valve type check valve 34 is interposed. The flow state of the air-fuel mixture flowing into the combustion chamber 32 is changed by changing the rotation angle of the check valve 34 according to the operating state of the engine. It is configured as follows.

[0005]

In the above-mentioned prior art, in the case of the former prior art shown in FIG. 2, the fuel injected from the injector 26 collides with the end of the shutter valve 25 to promote the atomization of fuel. However, the shutter valve 25 itself is not provided with a device for atomizing fuel, and atomization of fuel is not always sufficient.

On the other hand, in the case of the latter prior art shown in FIG.
Although the flow state of the air-fuel mixture flowing into the combustion chamber 32 is changed in accordance with the operating conditions of the engine to thereby improve the combustion, no special consideration is given to fuel atomization.

SUMMARY OF THE INVENTION An object of the present invention is to provide an intake system for an engine which can greatly improve the effect of improving combustion as compared with the prior art, and which is lightweight, compact and low in cost. is there.

[0008]

In order to achieve the above object, an intake device according to the present invention is provided with a partition partitioning the inside of a passage in a passage of an intake port opened to an engine combustion chamber to burn an intake flow. A first passage leading to the center of the combustion chamber so as to make a vertical swivel and a second passage leading to the outer periphery of the combustion chamber are formed. A shutter valve is provided on the side of the second passage, one end of which is rotatably supported by the wall of the passage, and the other end of the shutter comes into contact with the end of the partition wall during rotation to close or open the whole area of the second path. An electric heater is built in the shutter valve, and the opening and closing mechanism of the electric heater and the shutter valve is controlled by the ECU.
At least when the engine is cold, the shutter valve is closed and the electric heater is energized. After warming up, the shutter valve is opened and the electric heater is deenergized. The injection direction of the injector arranged in such a manner as to be in contact with the shutter valve containing the electric heater when the shutter valve is in the closed state.

[0009]

According to the above construction, when the engine is started in a cold state, the shutter valve closes the second passage. At this time, the electric heater is energized, and the fuel injected from the injector is supplied to the shutter valve incorporating the electric heater. The contact promotes the first-stage atomization here. Further, since the second passage is closed, the intake path is only the first passage,
Since the cross-sectional area of the passage decreases, the flow velocity of the air-fuel mixture flowing in the first passage increases, and the air-fuel mixture generates a tumble in the combustion chamber. As a result, the combustion improvement is greatly improved by the synergistic effect of the fuel atomization promotion effect and the tumble effect.

After the warm-up, the power supply to the electric heater is stopped. At this time, the shutter valve opens the entire second passage so that the mixture flow of the fuel injected from the injector is reduced in both the first passage and the second passage. At this time, the shutter valve is drawn into the wall of the passage and opens the entire second passage, so that the ventilation resistance due to the shutter valve does not occur and the charging efficiency can be improved.

In addition, since the electric heater is built into the shutter valve and integrated therewith, there is no inconvenience that the electric heater is exposed in the intake passage and comes into contact with fuel. A cost-effective intake device can be provided.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of an engine intake device showing one embodiment of the present invention. Reference numeral 1 denotes a cylinder head that forms an upper portion of an engine body. The cylinder head 1 has an engine combustion chamber via an intake valve 3a. An intake port 3 having a curved portion opening to the engine 2 and an exhaust port 4 having a curved portion opening to the engine combustion chamber 2 via the exhaust valve 4b are formed.

In the present invention, a partition 5 for partitioning the port is provided in the intake port 3, and the partition 5 defines a first passage 6 and a second passage 7. The first passage 6 is a passage through which the intake air flow is vertically swirled to a central portion in the combustion chamber 2, and the second passage 7 is a passage through which the intake air flow is guided to an outer peripheral portion in the combustion chamber 2. Further, a shutter valve 8 is provided in the second passage 7, and one end of the shutter valve 8 is axially attached to a wall surface on the side of the second passage 7 via a shaft 9. Abuts against the end of the partition wall 5 so that the second passage 7 is entirely closed or fully opened. The shutter valve 8 is provided with an EC provided in the engine control system.
An electric heater 8a controlled to be energized or de-energized by a control signal of U11 is incorporated. Further, the shutter valve 8
The opening / closing mechanism of the intake passage 1 communicates with the intake port 3.
A check valve 13 and an ECU 11 for preventing backflow of air in the middle of the suction pipe negative pressure A communicating the actuator 4 and the actuator 10
Valve 12 that is opened and closed by a control signal
The actuator 10 and the shutter valve 8 are linked by an arm B having B1 as a play point and B2 as a fulcrum. Further, an injector 15 is provided in the intake passage 14, the injection direction of the injector 15 is set to a region shown by a dotted line in the drawing, and the injector 15 is arranged so that the injected fuel contacts the shutter valve 8 when the shutter valve 8 is in a closed state. ing.

Next, the operation of the present invention will be described. During a cold start of the engine, the solenoid valve 12 is opened by a control signal from the ECU 11, the negative pressure in the intake passage 14 is actuated by the actuator 10 to close the shutter valve 8, and the electric heater 8 a is controlled by the control signal from the ECU 11.
Is turned on. As a result, the fuel injected from the injector 15 comes into contact with the shutter valve 8 and is heated by the electric heater 8a incorporated in the shutter valve 8, so that atomization of the fuel is promoted. Further, since the shutter valve 8 is closed, the intake path is only the first passage 6, and the cross-sectional area of the passage is reduced, so that the flow rate of the air-fuel mixture flowing through the first passage 6 increases, and the air-fuel mixture flows in the Occur. As a result, the combustion improvement is greatly improved by the synergistic effect of the fuel atomization promotion effect and the tumble effect.

When the engine temperature rises after a lapse of time after the start of the engine, the solenoid valve 12 is closed by a command from the ECU 11 and the negative pressure in the intake passage 14 is not operated by the actuator 10. The valve 8 opens the entire area of the second passage 7 and, at the same time, turns off the electric heater 8 a according to a command from the ECU 11. As a result, the shutter valve 8 is pulled into the wall of the passage and the second passage 7
Is open to the whole area, so that the ventilation resistance caused by the shutter valve 8 does not occur, and the filling efficiency can be improved.

[0016]

As described above, according to the present invention, an electric heater is incorporated in a shutter valve that closes a passage at the time of a cold start of an engine, and the fuel is atomized by bringing the fuel into contact with the shutter valve. In addition, since the mixture of the atomized fuel and air generates a tumble in the combustion chamber, the combustion improvement is greatly improved by synergistic effects of the fuel atomization promotion effect and the tumble effect. Further, after the engine is warmed up, the shutter valve is drawn into the passage wall surface to open the entire second passage, so that the ventilation resistance due to the shutter valve does not occur, and the charging efficiency can be improved. In addition, as the device, the electric heater is built into the shutter valve and integrated, so that it can be made lightweight and compact,
A low-cost intake device can be provided.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an intake device of an engine showing one embodiment of the present invention.

FIG. 2 is an explanatory view of a conventional example.

FIG. 3 is an explanatory view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder head 2 Engine combustion chamber 3 Intake port 3a Intake valve 4 Exhaust port 4a Exhaust valve 5 Partition wall 6 First passage 7 Second passage 8 Shutter valve 8a Electric heater 9 Shaft 10 Actuator 11 ECU 12 Solenoid valve 13 Check valve 14 Intake passage 15 Injector A Suction negative pressure tube B Arm B1 Free point B2 Support point

────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification symbol FI F02M 69/00 310 F02M 31/12 321A 301R 301S (56) References JP-A-6-88560 (JP, A) JP-A-3 JP-A-37369 (JP, A) JP-A-63-143763 (JP, A) JP-A-63-12635 (JP, A) JP-A-63-69772 (JP, U) JP-A-62-193145 (JP, U) ) JP-A 5-52252 (JP, U) JP-A 60-39772 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) F02M 31/12 301-321 F02M 31/16 F02M 29/00 F02M 69/00 310 F02B 31/00-31/02

Claims (1)

(57) [Scope of request for utility model registration] A first passage for guiding an intake air flow to a central portion in the combustion chamber by providing a partition wall for partitioning the inside of the passage in a passage of an intake port opened to the engine combustion chamber; A second passage leading to the outer peripheral portion of the second passage; one end of the second passage is rotatably supported by the wall of the passage, and the other end abuts on the end of the partition wall during rotation. A shutter valve for closing or opening the whole area of the two passages is provided. An electric heater is built in the shutter valve, and an opening and closing mechanism of the electric heater and the shutter valve is controlled by the ECU. The shutter valve is closed, the electric heater is energized, and after warm-up, the shutter valve is opened, the electric heater is de-energized, and the injection direction of the injector disposed toward the intake port is controlled by the shutter. Valve closed An intake system for an engine characterized by comprising arranged so as to abut against the at shutter valve the electric heater with built.