Internal-combustion engines – Engine speed regulator – Specific throttle valve structure
Reexamination Certificate
1998-06-15
2001-02-13
Argenbright, Tony M. (Department: 3747)
Internal-combustion engines
Engine speed regulator
Specific throttle valve structure
C123S339250, C123S399000, C251S305000
Reexamination Certificate
active
06186115
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a throttle valve control device for an internal combustion engine, and particularly to a throttle valve control device for an internal combustion engine, which is suitable for use in a throttle valve control device of an electronically-controlled throttle type.
BACKGROUND ART
A so-called throttle valve control device of an electronically-controlled throttle type, which in order to control the degree of opening of a throttle valve for a vehicle internal combustion engine, takes in or senses the amount of depression of an accelerator pedal as an electric signal by a detector (sensor), performs arithmetic processing on it, supplies the so-processed signal to an actuator comprised of a motor or the like and controls the opening and closing of the throttle valve by the actuator, is known in Japanese Patent Applicaticn Laid-Open No. 62-284932 or the like.
There has been a demand for a throttle valve control device allowing only this type of electronically-controlled throttle valve to perform all inclusive of air quantity control, such as ISC (Idle Speed Control), FIC (First Idle Control) in a region in which an intake air flow rate is less.
With a view toward allowing control of small or thin intake air quantity, it is necessary to allow the rate of change in air passage sectional area between the throttle valve and a wall surface of a intake pipe to finely vary with satisfactory accuracy according to a change in the degree of opening of the throttle valve as well as to improve the accuracy of control of the actuator itself to thereby permit fine control on the degree of opening of the throttle valve.
In regard to this point of view, as has been described in Japanese Patent Application Laid-Open Nos. 5-296067, 3-11133 and 3-15631 or Japanese Patent Application Laid-Open No. 56-56938 or the like, it is considered that some thought or ideas are put into profiles of a bore inner wall surface of an intake pipe opposed to a disc-shaped throttle valve, and the rate of changes in passage sectional area between the throttle valve and the wall surface with respect to a change in the degree of opening of the throttle valve is set so as to be able to be finely controlled in a low degree-of-opening region (FIC or ISC region) of the throttle valve.
An object of the present invention is to provide a novel throttle valve control device of capable of meeting the above-described demands on the electronically-controlled type throttle valve control device. However, this can be used when a like characteristic (e.g., generally called “delayed-opening characteristic”) is required even in the case of a non-electronically-controlled type throttle valve control device.
DISCLOSURE OF INVENTION
In order to achieve the above object, the present invention provides a throttle valve control device for an internal combustion engine, comprising a throttle valve rotatably mounted to a throttle body having a bore which is defined so that the center of rotation of the throttle valve is placed on a line connecting the center of an opening on the upstream side of the throttle body and the center of an opening on the downstream side thereof, and which has curved-surface profiles each spherical or closely analogous to a spherical form, which are provided on at least one of the upstream and downstream sides of the throttle valve in an idle control region lying in the vicinity of a fully-closed angle of the throttle valve. In the throttle valve control device, the bore of the throttle body has curved-surface profiles or conical surface profiles substantially parallel to the flow of intake air, which follow the curved-surface profiles spherical or closely analogous to the spherical form. Such a construction can provide matching to an electronically-controlled system and improve the accuracy of measurement in the ISC and FIC regions and controllability on an air flow rate.
In the throttle valve control device for the internal combustion engine, the curved-surface profiles substantially parallel to the flow of the intake air are preferably formed as cylindrical surface profiles.
In the throttle valve control device for the internal combustion engine, preferably, regions for the curved-surface profiles each spherical or closely analogous to the spherical form are formed on the upstream and downstream sides of the throttle valve, and at least one thereof is formed from a curved-surface profile or conical surface profile substantially parallel to the flow of intake air, following the curved-surface profiles and a composite surface profile.
In the throttle valve control device for the internal combustion engine, preferably, the regions for the curved-surface profiles spherical or closely analogous to the spherical form and regions each consisting of a composite surface profile of a curved-surface profile spherical or closely analogous to a spherical form and a curved-surface profile or conical surface profile substantially parallel to the flow of the intake air, following the curved-surface profile referred to above, are provided on one of the upstream and downstream sides of the throttle valve, whereas a conical surface profile is provided on the other of the upstream and downstream sides of the throttle valve.
The object of the present invention can be achieved even by constructing a degree-of-opening signal indicative of the actual degree of opening of the throttle valve in such a manner that the rate of change in the signal with respect to the same angular change becomes greater than in middle and high degree-of-opening regions in a predetermined degree-of-opening region of the throttle valve and constructing an inner peripheral wall surface profile of the throttle body so as to have a degree-of-opening—air quantity change rate characteristic allowing control on an air flow rate equivalent to a change in engine speed of 20 rpm/min in the predetermined low degree-of-opening region thereof.
Further, the above object of the present invention can be achieved by constructing the regions for the curved-surface profiles spherical or closely analogous to the spherical form and constructing the wall surface profile on at least one of the upstream and downstream sides of the throttle valve so as to comprise a composite surface profile of a conical surface profile following a curved-surface profile spherical or closely analogous to a spherical form and a cylindrical surface profile following the conical surface profile.
Further, in order to achieve the above object, the present invention provides a throttle valve control device for an internal combustion engine, comprising a throttle valve rotatably mounted to a throttle body and an actuator for rotating the throttle valve and wherein the throttle body has a bore defined therein including such a shape that the center of rotation of the throttles valve is located on a line connecting the center of an opening on the upstream side of the throttle body and the center of an opening on the downstream side thereof, and curved-surface profiles each spherical or closely analogous to a spherical form in the idle control region lying in the vicinity of the fully-closed angle of the throttle valve and both regions on the upstream and downstream sides of the throttle valve. In the throttle valve control device for the internal combustion engine, the position of the center of each curved-surface profile corresponds to a position deviated by a predetermined amount from the center of rotation of the throttle valve. The bore of the throttle body has regions each consisting of a curved-surface profile spherical or closely analogous to a spherical form and a composite surface profile of a surface substantially parallel to the flow of intake air, following the curved-surface profile, as regions following the curved-surface profiles spherical or closely analogous to the spherical form.
Moreover, in order to achieve the above object, the present invention provides a throttle valve control device for an internal combustion engine, comprising a throttle valve ro
Adachi Hidefumi
Hashimoto Yoshikatsu
Nishimura Mitsunori
Argenbright Tony M.
Evenson, McKeown, Edwards & Lenahan P.L.L.C.
Hitachi , Ltd.
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