Engine retarding method and apparatus

Patent · Tue Jun 03 04:00:00 EDT 1986

OSTI ID:5502252

Meistrick, Z S

A process is described for compression release retarding of a cycling multi-cylinder four cycle internal combustion engine having a crankshaft and an engine piston operatively connected to the crankshaft for each cylinder thereof and having intake and exhaust valves for each cylinder thereof comprising, for at least one cylinder thereof, the steps of reducing the flow of fuel to the cylinder, commencing opening the exhaust valve for the cylinder prior to the top dead center position of the engine piston during an upstroke of the piston corresponding to its compression stroke during normal operation of the engine to produce a compression release event, holding the exhaust valve open during a substantial portion of the ensuing downstroke of the engine piston, disabling the exhaust valve from moving at the point it would move in the cycle during normal operation of the engine, at least partially closing the exhaust valve commencing near to the bottom dead center position of the engine piston corresponding to its expansion stroke during normal operation of the engine, holding the exhaust valve in the partially closed position during at least the ensuing upstroke of the engine piston corresponding to its exhaust stroke during normal operation of the engine to produce a bleeder retarding event, operating the intake valve as it would move in the cycle during normal operation of the engine, and fully closing the exhaust valve commencing at least early during the ensuing downstroke of the engine piston corresponding to its intake stroke during normal operation of the engine whereby one compression release retarding event and one bleeder retarding event is produced in the one cylinder during each engine cycle comprising two revolutions of the crankshaft.

• Assignee: Jacobs Manufacturing Co., Bloomfield, CT
• Patent Number(s): US 4592319
• OSTI ID: 5502252
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
COMPRESSION
CONTROL EQUIPMENT
CYLINDERS
ENGINES
EQUIPMENT
EXHAUST SYSTEMS
EXPANSION
FLOW REGULATORS
FLUIDS
HEAT ENGINES
HYDRAULIC FLUIDS
INTAKE STRUCTURES
INTERNAL COMBUSTION ENGINES
MACHINE PARTS
MECHANICAL STRUCTURES
PISTONS
PRESSURE EFFECTS
SHAFTS
VALVES
WORKING FLUIDS