Exhaust gas recirculation system

Patent · Tue Sep 25 04:00:00 EDT 1979

OSTI ID:5834312

Aoyama, S

The EGR control system comprises EGR control valve means including a first fluid chamber the vacuum in which increases and decreases in accordance with operating conditions of the engine whereby EGR control valve means control the recirculated amount of exhaust gases back to the engine and a second fluid chamber receiving therein a suction vacuum to thereby cause multiplication of the vacuum in the first chamber without altering the correspondency between the operating condition of the engine and the degree of opening of the EGR control valve means whereby the variable range of the vacuum in the first fluid chamber is optimally enlarged. An EGR control system further comprises relief valve means for reducing the EGR ratio below a predetermined constant level upon high speed low load operating condition of the engine and which includes a fluid chamber directly communicating with the first fluid chamber of the EGR control valve means whereby the relief valve means is operated by the vacuum substantially equal to the vacuum in the first fluid chamber of the EGR control valve means. 12 claims.

• Assignee: Nissan Motor Company, Ltd.
• Patent Number(s): US 4168684
• OSTI ID: 5834312
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330700* -- Advanced Propulsion Systems-- Emission Control
AUTOMOBILES
CONTROL SYSTEMS
EQUIPMENT
EXHAUST RECIRCULATION SYSTEMS
EXHAUST SYSTEMS
POLLUTION CONTROL EQUIPMENT
VEHICLES