Exhaust gas recirculation method for internal combustion engines

Patent · Tue Dec 23 04:00:00 EST 1986

OSTI ID:7050144

Hashiguchi, M; Fukotomi, Y

A method is described of controlling exhaust gas recirculation in an internal combustion engine having an exhaust passage, an intake passage, and a throttle valve arranged in the intake passage, by means of an exhaust gas recirculation control system including an exhaust recirculating passage connected between the exhaust passage and the intake passage, an exhaust gas recirculating valve arranged across the exhaust gas recirculating passage, and differential pressure-operated actuator means for varying the opening of the exhaust gas recirculating valve. The differential pressure-operated actuator means has a pressure-responsive member having one side surface acted upon by atmospheric pressure and another side surface by a synthetic pressure of pressure within the intake passage at a zone downstream of the throttle valve and atmospheric pressure wherein the pressure-responsive member is displaceable in response to a pressure difference between the atmospheric pressure, applied to the another side surface thereof. The differential pressure-operated actuator means is adapted to vary the synthetic pressure in response to at least one operating parameter of the engine to control the exhaust gas recirculating valve. The method comprises: (1) detecting the atmospheric pressure and the pressure within the intake passage at the zone downstream of the throttle valve; (2) determining a difference between the detected value of atmospheric pressure and the detected value of the pressure within the intake passage; and (3) controlling the exhaust gas recirculating valve to fully closed position when the determined pressure difference is smaller than a predetermined value.

• Assignee: Honda Giken Kogyo K.K., Tokyo
• Patent Number(s): US 4630589
• OSTI ID: 7050144
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
330700 -- Advanced Propulsion Systems-- Emission Control
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION CONTROL
ATMOSPHERIC PRESSURE
CONTROL
CONTROL EQUIPMENT
CONTROL SYSTEMS
DESIGN
ENGINES
EQUIPMENT
EXHAUST GASES
EXHAUST RECIRCULATION SYSTEMS
EXHAUST SYSTEMS
FLOW REGULATORS
FLUIDS
GASEOUS WASTES
GASES
HEAT ENGINES
INTAKE STRUCTURES
INTERNAL COMBUSTION ENGINES
MECHANICAL STRUCTURES
OPERATION
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
PRESSURE EFFECTS
PRESSURE MEASUREMENT
VALVES
WASTES