Exhaust gas recirculation system for internal combustion engines
In an exhaust gas recirculation system for an internal combustion engine, a flow control valve is disposed within a recirculation pipe and operatively connected to a pneumatically operated servomotor to control the flow quantity of exhaust gases through the recirculation pipe, and an orifice is disposed within the recirculation pipe upstream of the valve to form a space between the valve and the orifice. A pressure regulator serves to modulate negative pressure from an engine intake manifold to the servomotor on a basis of pneumatic pressure applied thereto and pressure in the space. The pneumatic pressure applied to the pressure regulator is electrically controlled to satisfy the following equation. Pd f(Pv, n) where the character pd is the pneumatic pressure applied to the pressure regulator, and the characters pv and N respectively indicate the negative pressure in the intake manifold and the engine speed.
- Assignee:
- Nippon Soken Inc (Japan); Toyota Jidosha Kogyo K K (Japan)
- Patent Number(s):
- US 4242997
- OSTI ID:
- 6470232
- Country of Publication:
- United States
- Language:
- English
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Electronic control system for internal combustion engines
Exhaust recirculation system for internal combustion engines
Related Subjects
330100 -- Internal Combustion Engines
330700* -- Advanced Propulsion Systems-- Emission Control
CONTROL EQUIPMENT
CONTROL SYSTEMS
DESIGN
ENGINES
EQUIPMENT
EXHAUST GASES
EXHAUST RECIRCULATION SYSTEMS
EXHAUST SYSTEMS
FLOW REGULATORS
FLUID FLOW
FLUIDS
GASEOUS WASTES
GASES
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
PIPES
POLLUTION CONTROL EQUIPMENT
PRESSURE REGULATORS
VALVES
WASTES