Method of operating an automotive type internal combustion engine

Patent · Tue Jul 06 04:00:00 EDT 1993

OSTI ID:6312708

Havstad, P H; Tabaczynski, R J

A method is described of operating at idle speed condition an automotive type internal combustion engine having an intake manifold with intake and exhaust ports and intake and exhaust valves, throttling means upstream of and associated with the intake port and variably movable between throttling and unthrottling positions to control flow through the intake port, and phase shifting means for varying the opening and closing of the valves from a fixed timing schedule as a function of operating conditions to obtain efficient operation and control of emissions, comprising the steps of: first, inserting a one-way valve adjacent the intake port upstream of the intake valve operable to prevent flow of engine cylinder contents from the cylinder past the port while permitting intake flow of charge and gases into the cylinder in the opposition direction; secondly, opening the engine exhaust valve during the engine expansion stroke at cylinder pressures higher than manifold pressure; thirdly, with essentially unthrottled control of the intake port to minimize engine pumping losses, and shortly after opening of the exhaust valve, opening the engine intake valve thereby effecting closing of the one-way valve under the influence of high cylinder pressure to block the flow of exhaust gases towards the intake port; fourthly, maintaining the exhaust valve open allowing the piston to draw in exhaust gases from the exhaust manifold for exhaust gas recirculation (EGR) for minimum emission control; fifthly, closing the exhaust valve shortly thereafter at a point permitting only that quantity of exhaust gases to be influxed to provide the minimum EGR emission control that is necessary; and finally, closing the intake valve early in the engine intake stroke after exhaust valve closure to provide only that amount of intake charge necessary to overcome engine friction and sustain engine operation while minimizing/eliminating engine pumping losses.

• Assignee: Ford Motor Co., Dearborn, MI (United States)
• Patent Number(s): A; US 5224460
• Application Number: PPN: US 7-832831
• OSTI ID: 6312708
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330603 -- Vehicle Design Factors-- Engine System
330700* -- Advanced Propulsion Systems-- Emission Control
ACCUMULATORS
AIR POLLUTION CONTROL
COMBUSTION CONTROL
CONTAINERS
CONTROL
CONTROL EQUIPMENT
ENGINES
EQUIPMENT
EXHAUST RECIRCULATION SYSTEMS
EXHAUST SYSTEMS
FLOW REGULATORS
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
TANKS
VALVES