Internal-combustion engines – Charge forming device – Exhaust gas used with the combustible mixture
Patent
1997-08-29
1998-07-28
Wolfe, Willis R.
Internal-combustion engines
Charge forming device
Exhaust gas used with the combustible mixture
123571, F02M 2507
Patent
active
057850348
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on an exhaust gas recirculation apparatus having a closing element actuatable in the intake conduit.
Such apparatuses are known. In some versions, exhaust gas delivery conduits are passed laterally into the intake conduits and are opened or closed there, for instance via cup valves. To that end, the closure cups of the valves are placed on the respective opening of the corresponding exhaust gas delivery conduit in the intake conduit, or are lifted by that exhaust gas delivery conduit. In unregulated apparatuses, the drive for adjusting the closure cup is accomplished via negative pressure boxes. A comparable apparatus to this is known from U.S. Pat. No. 3,901,203. However, in that patent, the negative pressure box moves a hinged flap. The entire exhaust gas recirculation valve is also seated in an exhaust gas line located outside the intake conduit. British Patent GB 1 388 032 also describes an exhaust gas recirculation valves located outside the intake conduit.
More recent exhaust gas recirculation valves are driven in regulated fashion. To that end, the known closure cup in the intake conduit, for instance, is moved axially toward or away from the opening of the exhaust gas delivery conduit with the aid of a pneumatic drive. By the drive-dictated elasticity, the exhaust gas pressure acting on the valve cup, and the flow conditions in the intake conduit, undesirable inaccuracies arise in the case of infinitely variable adjustment, especially in the low-load range when valve gaps are small.
Complicated constructions are also known in which the valve cup or the closing member is moved with the aid of a geared motor.
ADVANTAGES OF THE INVENTION
The subject of the invention is an exhaust gas recirculation apparatus in which among other elements the exhaust gas delivery conduit and the adjusting drive are disposed in the intake conduit in such a way, and the valve parts are embodied in such a way, that only minimal forces caused by the flow of exhaust gas and fresh gas act upon the closing element and its drive. To that end, a substantially cylindrical exhaust gas delivery tube as part of an exhaust gas delivery neck protrudes into the intake conduit, virtually perpendicular to the fresh gas flow, and the neck has an outlet opening in its cylindrical wall. A rotary disk bell is disposed as a closing element above the outlet opening and it at least intermittently surrounds the exhaust gas delivery tube protruding into the intake conduit. The rotary disk bell is coupled with an electric pivoting motor acting as the adjusting drive.
The electric pivoting motor is for instance a so-called electromagnetic rotary adjuster. The coil winding of this pivoting motor is acted upon by a pulsating direction current. The resultant torque of the rotor acts counter to a restoring spring. With respect to the type of rotary adjuster, the coil winding together with an iron yoke may form the stator, and a permanent magnet together with the pivoting shaft can form the rotor, among other elements. The pivoting motion of the closing element may also be accomplished with the aid of a stepping motor.
To generate a good mixture of fresh and exhaust gas, the outlet opening of the exhaust gas delivery tube protruding into the intake conduit is disposed approximately crosswise and downstream of the exhaust gas delivery tube, in terms of the flow direction of the fresh gas stream. As a result of this arrangement, exhaust residues can hardly become deposited in the region of the valve or throttle valve. In the case of curved intake conduits or conduits with other flow obstacles, the exhaust gas for achieving an optimal mixing can also be introduced obliquely to the fresh gas stream. To that end, the exhaust gas delivery tube can be mounted pivotably in the form of a component insertable separately into the exhaust gas delivery neck.
As a rule, the closing element or the rotary slide bell is in alignment relative to the exhaust gas delivery neck and the exhaust gas delivery tube. The center lines of the e
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Linke Thomas
Moedinger Hermann
Greigg Edwin E.
Greigg Ronald E.
Robert & Bosch GmbH
Wolfe Willis R.
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