Solenoid valve control for exhaust gas recirculation

Patent · Tue Mar 26 04:00:00 EDT 1974

OSTI ID:7357234

Frank, D L

A solenoid control valve for use in exhaust gas recirculation systems designed to minimize nitrogen oxide emissions from internal combustion engines is designed to open and close each engine cycle with the opening time being in accordance with engine operation conditions, as opposed to conventional systems in which the valve gradually opens and closes in response to a selected engine condition. The solenoid valve in the exhaust gas recirculation passage is controlled by an electrical circuit so as to be energized to the open position in accordance with engine speed, with a means being included for varying the energization time in response to manifold pressure. The circuit includes an amplifier for energizing and deenergizing the solenoid during each engine cycle, a pressure transducer positioned at the intake passage downstream of the throttle for responding to absolute pressure at the intake passage, and a means for responding to the transducer and for controlling the amplifier energization.

• Assignee: General Motors Corp.
• Patent Number(s): US 3799133
• OSTI ID: 7357234
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330701* -- Emission Control-- Nitrogen Oxides
ACTUATORS
CONTROL EQUIPMENT
CONTROL SYSTEMS
DESIGN
ELECTRIC COILS
ELECTRICAL EQUIPMENT
ELECTRONIC CIRCUITS
ENGINES
EQUIPMENT
EXHAUST RECIRCULATION SYSTEMS
EXHAUST SYSTEMS
FLOW REGULATORS
INTERNAL COMBUSTION ENGINES
POLLUTION CONTROL EQUIPMENT
PRESSURE DEPENDENCE
SOLENOIDS
VALVES