Intake control device of internal combustion engine

Details Intake control device of internal combustion engine Intake control device of internal combustion engine

1993-03-01

1994-09-06

Argenbright, Tony M.

Internal-combustion engines

Engine speed regulator

Charge volume varying

123405, 1374546, 137883, F02D 3302, F02D 916

Patent

active

053438418

DESCRIPTION:

BRIEF SUMMARY
DESCRIPTION

1. Technical Field
The present invention relates to an intake control device of an internal combustion engine provided with an intake control valve in each intake passage communicating with each engine cylinder and an intake valve installed in a combustion chamber of the internal combustion engine and, more particularly, to the constitution of these intake control valves.
2. Background Art
In the internal combustion engine, there sometimes takes place a state of valve overlap in which an intake valve and an exhaust valve simultaneously open when the intake stroke starts. In such a case there occurs the back flow of burned gases from inside the cylinder and an exhaust passage into an intake passage, resulting in such a trouble as a lowered intake air charging efficiency and deteriorated fuel economy. To prevent this back flow of burned gases by means of an intake control valve, there has been proposed, as disclosed in for example Japanese Patent Laid-Open No. Sho 63-65138, a means to prevent the back flow by the intake control valve installed in each intake passage communicating with each engine cylinder and an intake valve is provided in the combustion chamber of the internal combustion engine. On the valve overlap when the intake and exhaust valves are simultaneously opened, each of these intake control valves is operated by an independent actuator to close the intake air passage, thereby checking the back flow of the burned gases to improve the intake air charging efficiency.
Since the quantity of intake air to be drawn into the combustion chamber of the internal combustion engine can be controlled by controlling an air intake period by the intake control valve simultaneously with the movement of an internal engine piston, it is possible to open the throttle valve wide to maintain a high intake passage pressure on the intake stroke. Therefore, air supply into the internal combustion engine during partial load operation can easily be performed, thereby reducing a pumping loss, realizing an increase in an internal engine torque and improving fuel economy.
However, the prior-art intake control valve disclosed in the aforementioned patent publication is of such a structure that a push rod is actuated by an actuator which includes a piezoelectric element disposed outside of the intake passage, to thereby operate a valve body which comprises a plurality of spring plate members installed in the intake passage, thus opening and closing the intake passage.
The aforesaid intake control valve has many component parts because the valve body thereof uses a number of plate members to open and close the intake passage and requires much time to install. In addition a clearance is likely to occur between each valve body and the intake passage, giving a considerable influence to the engine performance. To eliminate this clearance, it will become necessary to improve a valve body processing accuracy, which, however, will result in an increased cost.
Furthermore, the prior-art intake control device has the following disadvantage that the overall structure of the intake control valve including the actuator consisting of the piezoelectric element and others is likely to become large in size and further the surrounding structure of the intake passage becomes complicated, and also it has so excessive weight as to give a great effect to the weight of the vehicle body, thus increasing the fuel consumption of the internal combustion engine.


DISCLOSURE OF THE INVENTION

The present invention has been accomplished in an attempt to obviate the above-mentioned disadvantages and has as its object the provision of an intake control device of an internal combustion engine which is easy to handle and can easily be mounted in the intake air passage.
It is another object of the present invention to improve the clearance accuracy of the intake control device and to control intake operation with high accuracy by reducing air leakage.
It is further another object of the present invention to provide an intake control valve which

REFERENCES:
patent: 4354459 (1982-10-01), Maxey
patent: 4484543 (1984-11-01), Maxey
patent: 4738233 (1988-04-01), Hitomi et al.
patent: 4796584 (1989-01-01), Goto et al.
patent: 5005545 (1991-04-01), Wendel et al.
patent: 5080065 (1992-01-01), Nomura et al.
Patent Abstract of Japan, vol. 12, No. 014 (M-659) Jan. 16, 1988, JP-A-62 174 531, Jul. 1988.
Patent Abstract of Japan, vol. 12, No. 014 (M-659) Jan. 16, 1988, JP-A-62 174 513, Jul. 1987.

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