Internal-combustion engines – Intake manifold – Manifold tuning – balancing or pressure regulating means
Reexamination Certificate
1999-09-20
2001-06-26
Wolfe, Willis R. (Department: 3747)
Internal-combustion engines
Intake manifold
Manifold tuning, balancing or pressure regulating means
Reexamination Certificate
active
06250272
ABSTRACT:
BACKGROUND OF THE INVENTION
This application claims the priority of 198 42 724.7, filed Sep. 18, 1998, the disclosure of which is expressly incorporated by reference herein.
The present invention relates to a suction system having a device for utilizing resonance effects for an internal-combustion engine equipped with a lambda control and opposed cylinders, and more particularly, to a suction system.
A known internal-combustion engine, German Special Edition
ATZ Automobiltechnische Zeitschrift; MTZ Motortechnische Zeitschrift
, pages 16 to 19, has opposed cylinder banks, a resonance-type suction system with an air flow sensor and a valve mechanism having a lambda control. DE 36 33929 C2 and EP 0 056 076 B1 relate to suction systems for internal-combustion engines by way of which resonance effects are achieved.
DE 198 14 970.0-13, which is not a prior publication, shows a pipe connection between an air filter and a suction system having a device for utilizing resonance effects. In sections, the pipe connection is provided with two parallel pipe sections, in front of which a single pipe section is connected. A throttle valve and an air flow sensor are integrated in the above-mentioned single pipe section.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a suction system for an internal-combustion engine which, while the resonance effect is good, is optimized with respect to component expenditures along a significant internal-combustion engine rotational speed range.
Principal advantages achieved with the invention are that, as the result of the pipe sections with the throttle valves in the pipe connection and the transverse ducts having a shut-off flap and a resonance flap in the resonance container, targeted resonance effects are achieved. Along a wide rotational speed range of the internal-combustion engine, these effects lead to an optimized torque behavior of the internal-combustion engine. Only one air flow sensor is required in one pipe section, because the correction of the air flow in the other pipe section takes place by the existing lambda control. Finally, the pipe sections and the transverse ducts can easily be implemented in a suction system.
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Article, Porsche 911 Carrera—Gesamtfahrzeug, pp. 16, 18 & 19.
MTZ Motortechnische Zeitschrift 50, 1981, pp. 240-241.
Bruestle Claus
Rutschmann Erwin
Dr. Ing. h.c.F. Porsche AG
Evenson, McKeown, Edwards & Lenahan P.L.L.C.
Huynh Hai
Wolfe Willis R.
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