Patent Application
20170058844
The disclosed inventive concept relates generally to vacuum solenoids and intake manifolds for internal combustion engines. More particularly, the disclosed inventive concept relates to an integrated solenoid for controlling a CMCV vacuum system. The system supplies a vacuum to an actuator to operate a movable flap fitted inside the intake manifold runner.
The intake manifold fitted to the modern automotive vehicle delivers incoming air from the air filter into the combustion chamber. Components associated with the intake manifold include the throttle body, the mass air flow sensor, various ducts and a fuel rail. The conventional intake manifold includes a plenum and an intake runner formed between the plenum and each cylinder.
The volume of the plenum and the geometry of the individual runner dictate engine performance. In the typical engine, the runner geometry is fixed. Engine performance may be modified by changing the volume of the plenum and the geometry of the runner. However, the fixed volume of the plenum and the fixed geometry of the runner, even when tuned for a specific engine and desired performance characteristics, are not perfectly suited for every engine speed. The most desirable aspect to adjust over different engine speeds is the length of the runner.
In an effort to improve engine performance, an active air intake manifold was developed which includes a valve to regulate the incoming air/fuel mix. An open valve forms a longer path for the incoming air/fuel mix, a condition that is desirable when the engine is operating at low revolutions. On the other hand, a closed valve shortens the runner path to improve engine performance when operating at high revolutions.
Another approach to improving engine performance is through the provision of a charge motion control valve (CMCV) system in which a flap is movably fitted in the primary runner. According to this system, the movable flap may partially and selectively block the air flow. By so doing, turbulence is created that helps improve fuel mixing at lower engine speeds.
In today's vehicle, the vacuum solenoid has several rubber hoses that connect it to the other parts of the intake system, including a vacuum hose to the intake manifold vacuum reservoir. These hoses take up space in the vehicle's engine compartment and add weight to the vehicle. The hoses also add material cost to the vehicle and require labor for their installation. Furthermore, experience has shown that rubber hoses introduce into the system an opportunity for leakage, thus causing vehicle performance problems. The problems associated with leaking hoses become more pronounced as the vehicle ages.
Thus known approaches to attaching the vacuum solenoid to the intake manifold reservoir are undesirable and impractical. Accordingly, an improved arrangement for associating the vacuum solenoid with the intake manifold remains wanting.
The disclosed inventive concept overcomes the problems associated with known solenoid designs. Particularly, the disclosed inventive concept provides an intake manifold arrangement that comprises an integrated vacuum solenoid and an intake manifold. The vacuum solenoid is plugged into the intake manifold reservoir via a sealing member. The integrated vacuum solenoid is operatively associated with the charge motion control system. The integrated solenoid of the disclosed inventive concept may be used to control both the valve in the active air intake as well as the flap in the CMCV system.
Particularly, the vacuum solenoid includes a body and a pair of opposed attachment arms extending from the body. The body further includes a atmosphere port and a vacuum port defined by an annular collar. The annular collar includes at least one peripheral groove in which a sealing member, such as an o-ring, is fitted. Alternatively, an o-ring seal may be provided between the base of the body and the outer surface of the manifold. A conically-shaped bore is formed centrally through the annular collar.
The intake manifold includes an inlet into which the annular collar of the vacuum solenoid is fitted. A fluid-tight seal is formed between the inlet of the intake manifold and the annular collar or the body of the vacuum solenoid by the sealing member. The intake manifold further includes arm attachment posts to which the opposed attachment arms of the vacuum solenoid are attached.
The arrangement for attaching the opposed attachment arms to the arm attachment posts includes spools with each spool having a peripheral groove formed therein. Each spool is attached to its respective arm attachment post by a mechanical fastener such as a bolt. An end of each of the attachment arms is fitted into its respective spool.
Each arm attachment post includes a bore in which a threaded sleeve insert is fitted. The mechanical fastener is threaded into the threaded insert for secure attachment of the vacuum solenoid to the intake manifold.
The arrangement of the intake manifold integrated vacuum solenoid according to the disclosed inventive concept eliminates hoses, thus reducing the possibility of operational failure due to hose leaks. The arrangement of the disclosed inventive concept also reduces manufacturing costs by eliminating the expense of the hoses while reducing labor cost that would otherwise be incurred through the need to attach the hoses.
The above advantages and other advantages and features will be readily apparent from the following detailed description of the preferred embodiments when taken in connection with the accompanying drawings.
For a more complete understanding of this invention, reference should now be made to the embodiments illustrated in greater detail in the accompanying drawings and described below by way of examples of the invention wherein:
As those of ordinary skill in the art will understand, various features of the embodiments illustrated and described with reference to any one of the Figures may be combined with features illustrated in one or more other Figures to produce alternative embodiments that are not explicitly illustrated or described. The combinations of features illustrated provide representative embodiments for typical applications. However, various combinations and modifications of the features consistent with the teachings of the present disclosure may be desired for particular applications or implementations.
A solenoid attachment post 32 extends from the body 24 of the intake manifold 22. A smooth bore 34 is formed within the solenoid attachment post 32. The smooth bore 34 is continuous between an open end 36 and a manifold end 38. The manifold end 38 is continuous with an intake manifold vacuum reservoir 40.
It is to be understood that the intake manifold 22 illustrated in
The solenoid valve and intake manifold assembly 20 includes an integrated solenoid valve 50. The integrated solenoid valve 50 includes a solenoid valve body 52. Formed within the solenoid valve body 52 but not illustrated are the components of a solenoid valve, including, but not limited to, a hollow solenoid winding, a movable solenoid core disposed substantially with the winding, a metal disc attached to the movable solenoid core for opening and closing the flow of gas through the valve, and a return spring. The arrangement and design of such components are known to those skilled in the art.
A pair of attachment arms 54 and 54′ a provided perpendicular to the long axis of the solenoid valve body 52. The attachment arms 54 and 54′ extend outward from the solenoid valve body 52. The attachment arm 54 includes an attachment end 56 and the attachment arm 54′ includes an attachment end 56′.
A solenoid attachment spool 58 is attached to the attachment post 28 by a mechanical fastener such as a bolt 60. A solenoid attachment spool 58′ is attached to the attachment post 29 by a mechanical fastener such as a bolt 60′. A threaded sleeve 62 is formed within the solenoid attachment spool 58. The threaded sleeve 62 (shown in
The attachment spool 58 includes a peripheral groove 64 formed between an upper flange 66 and a lower flange 68. The attachment end 56 of the attachment arm 54 is slotted into the peripheral groove 64 of the attachment spool 58. The attachment spool 58′ includes a peripheral groove 64′ formed between an upper flange 66′ and a lower flange 68′. The attachment end 56′ of the attachment arm 54′ is slotted into the peripheral groove 64′ of the attachment spool 58′.
The solenoid valve body 52 includes an atmosphere port 70. The solenoid valve body 52 also includes an vacuum port 72. The vacuum port 72 is partially defined by an annular collar 74 having an inner, conically-shaped bore 76 and an outer surface 78. The annular collar 74 is substantially disposed within the smooth bore 34 of the solenoid attachment post 32
Peripherally formed on the outer surface 78 is a pair of spaced apart grooves 80 and 82. An o-ring 84 is positioned in the groove 82 and an o-ring 86 is positioned in the groove 82. A greater or lesser number of o-rings may be provided. The o-ring 84 provides a fluid-tight seal between the annular collar 74 and the smooth bore 34 of the solenoid attachment post 32. Thus the annular collar 74 of the integrated solenoid valve 50 is plugged into the intake manifold vacuum reservoir 40 via the o-rings 84 and 86.
A solenoid attachment post 102 extends from the body 94 of the intake manifold 92. A smooth bore 104 is formed within the solenoid attachment post 102. The smooth bore 104 is adjacent an end wall 106 formed in the body 94 of the intake manifold 92. The smooth bore 104 is continuous between an the end wall 106 and a manifold end 108. The manifold end 108 is continuous with an intake manifold vacuum reservoir 110.
The solenoid valve and intake manifold assembly 90 includes an integrated solenoid valve 120. The integrated solenoid valve 120 includes a solenoid valve body 122. A pair of attachment arms 124 and 124′ a provided perpendicular to the long axis of the solenoid valve body 122. The attachment arms 124 and 124′ extend outward from the solenoid valve body 122. The attachment arm 124 includes an attachment end 126 and the attachment arm 124′ includes an attachment end 126′.
A solenoid attachment spool 128 is attached to the attachment post 98 by a mechanical fastener such as a bolt 130. A solenoid attachment spool 128′ is attached to the attachment post 99 by a mechanical fastener such as a bolt 130′. A threaded sleeve 132 is formed within the solenoid attachment spool 128′.
The attachment spool 128 includes a peripheral groove 134 formed between an upper flange 136 and a lower flange 138. The attachment end 126 of the attachment arm 124 is slotted into the peripheral groove 134 of the attachment spool 128. The attachment spool 128′ includes a peripheral groove 134′ formed between an upper flange 136′ and a lower flange 138′. The attachment end 126′ of the attachment arm 124′ is slotted into the peripheral groove 134′ of the attachment spool 128′.
The solenoid valve body 122 includes an atmosphere port 140. The solenoid valve body 122 also includes a vacuum port 142. The vacuum port 142 is partially defined by an annular collar 144 having an inner, conically-shaped bore 146 and an outer surface 148. The annular collar 144 is substantially disposed within the smooth bore 104 of the solenoid attachment post 102
The solenoid valve body 122 includes a base 150. The base 150 includes at least one groove 152 and may include a second concentric groove 154. An o-ring 156 is positioned in the groove 152 and, if the second concentric groove 154 is provided, an o-ring 158 is positioned in the groove 154. A greater number of concentric o-rings may be provided. The o-ring 156 provides a fluid-tight seal between the annular collar 144 and the smooth bore 100 of the solenoid attachment post 102. Thus the annular collar 144 of the integrated solenoid valve 120 is plugged into the intake manifold vacuum reservoir 110 via the o-rings 154 and 156.
The embodiments of the disclosed inventive concept overcome challenges faced by known, multi-tube arrangements by providing continuity direct contact between the vacuum solenoid and the intake manifold. The arrangement is efficient and is not susceptible to wear and consequent leaks known in current technology. Both material cost and labor cost are reduced by adopting the disclosed arrangement in which the vacuum solenoid is integrated with the intake manifold.
One skilled in the art will readily recognize from such discussion, and from the accompanying drawings and claims that various changes, modifications and variations can be made therein without departing from the true spirit and fair scope of the invention as defined by the following claims.
