Exhaust recirculation system for internal combustion engines

Patent · Tue Apr 17 04:00:00 EST 1984

OSTI ID:6272445

Ina, T; Ishida, Y; Kawai, H; Kohama, T; Matsusita, S; Nishimatsu, A

In an exhaust gas recirculation system including a recirculation passage to provide a communication between an intake pipe and an exhaust pipe of an internal combustion engine, a flow control valve associated with a pneumatic servomotor to control the quantity of exhaust gas flowing through the recirculation passage in accordance with the pneumatic pressure applied to the servomotor, and first and second electrically operated valves to selectively apply negative pressure and the atmospheric pressure to the servomotor, a digital computer is adapted to calculate a desired opening degree of the flow control valve in response to an electric signal indicative of operating conditions of the engine, to calculate each energization time of the valves defined by a difference between the actual opening degree of the flow control valve and the calculated value in response to an electric signal indicative of the actual opening degree of the flow control valve, and to generate an output signal indicative of the calculated energization time.

• Assignee: Nippon Soken Inc. (Japan); Toyota Jidosha Kabushiki Kaisha (Japan)
• Patent Number(s): US 4442820
• OSTI ID: 6272445
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
330700 -- Advanced Propulsion Systems-- Emission Control
ATMOSPHERIC PRESSURE
COMPUTERS
CONTROL EQUIPMENT
DESIGN
DIGITAL COMPUTERS
ENGINES
EQUIPMENT
EXHAUST GASES
EXHAUST RECIRCULATION SYSTEMS
EXHAUST SYSTEMS
FLOW REGULATORS
FLUIDS
GASEOUS WASTES
GASES
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
MOTORS
PIPES
PNEUMATIC MOTORS
POLLUTION CONTROL EQUIPMENT
PRESSURE DEPENDENCE
SIGNALS
VALVES
WASTES