Electronic control system for internal combustion engines

US4257382A · kind A · utility

Assignees

• NIPPON SOKEN, INC. · JP
• TOYOTA JIDOSHA KABUSHIKI KAISHA · JP

Inventors

• Takeshi Matsui · Tokyo, JP
• Tokio Kohama · Nishio, JP
• Hisasi Kawai · Toyohashi, JP
• Akira Nishimatsu · Ebeye, US
• Toshikazu Ina · Ebeye, US
• Hidetaka Nohira
• Kiyoshi Kobashi · Mishima, JP

Key dates

• Filing date: Oct 16, 1979
• Grant date: Mar 24, 1981
• Expiry date: Oct 16, 1999

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/40
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

In an exhaust gas recirculation system adapted to an internal combustion engine, the system comprises a servomotor to be operated by pneumatic pressure and a control valve actuated by the servomotor to control the quantity of exhaust gases recirculated into an intake manifold from an exhaust pipe. The pneumatic pressure applied to the servomotor is electrically controlled without undesired errors to satisfy the following function in relation to the engine intake manifold vacuum and the engine speed: EQU Pe=f(Pv, N) where Pe is the pneumatic pressure applied to the servomotor, Pv and N respectively indicate the engine intake manifold vacuum and the engine speed.