System for combined egr and idle speed control

Patent · Tue Jul 22 04:00:00 EDT 1986

OSTI ID:5402406

Cook, J E

This patent describes a system including a throttle body communicating intake air to an intake manifold of an engine, the throttle body including a movable throttle plate, a first vacuum responsive valve, and a second vacuum responsive valve; means responsive to the position of the throttle plate for communicating vacuum manifold pressure to one of either of the first or second vacuum response valves and for communicating atmospheric pressure to the other of the first or second vacuum responsive valves; and means communicated to a vacuum input port on each of the vacuum responsive valves for varying the degree of manifold vacuum communicated thereto including: an electric vacuum regulator (EVR) including a plurality of pressure ports and a plurality of check valves, wherein one of the check valves communicates one pressure port of the EVR valve with the vacuum input port of the first vacuum responsive valve and wherein another of the check valves communicates a second pressure port of the EVR valve with the vacuum input port of the second vacuum responsive valve, first and second ports within the intake manifold and positioned relative to the throttle plate such that when the throttle plate is in a first condition the first port is communicated to manifold vacuum and the second port is communicated to atmospheric pressure, and when the throttle plate is moved to a second condition the communication of the first and second ports is reversed; and flow restrictors, one associated with each of the first port and the second port, for communicating the first and the second port with a particular vacuum input port associated with a corresponding one of the vacuum responsive valves.

• Assignee: Canadien Fram, Ltd., Chatham
• Patent Number(s): US 4601277
• OSTI ID: 5402406
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330603* -- Vehicle Design Factors-- Engine System
AIR FLOW
ATMOSPHERIC PRESSURE
CONTROL EQUIPMENT
ELECTRICAL EQUIPMENT
ENGINES
EQUIPMENT
FLOW REGULATORS
FLUID FLOW
GAS FLOW
INTAKE STRUCTURES
MECHANICAL STRUCTURES
POSITIONING
SPEED REGULATORS
VACUUM SYSTEMS
VALVES