Fuel injection system

US4170204A · kind A · utility

Assignee

• Audi NSU Auto Union Aktiengesellschaft · DE

Inventor

• Armin Bauder · Neckarsulm, DE

Key dates

• Filing date: Sep 28, 1977
• Grant date: Oct 9, 1979
• Expiry date: Sep 28, 1997

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M69/22
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A fuel injection system is provided for a mixture-compressing spark-ignition internal combustion engine having continuous fuel injection into the engine intake manifold, and an adjustable throttle valve in the manifold. A flow sensing element in the intake manifold is arranged to move in accordance with the quantity of air flowing through the manifold to operate a fuel-metering valve for dispensing a quantity of fuel proportion to the quantity of air. A constant pressure valve is arranged to ensure a substantially constant pressure differential across the metering valve. The constant pressure valve has two chambers separated from each other by a movable partition element. A differential pressure regulating valve also has two chambers separated by a movable partition element. The first chamber has a constant pressure valve being subject to the pressure downstream of the metering valve and communicates with a fuel injection nozzle of the engine. The second chamber of the constant pressure valve communicates with the first chamber of the differential pressure regulating valve. The second chamber of the differential pressure regulating valve is subject to the pressure upstream of the m…