Internal-combustion engines – Engine speed regulator – Responsive to deceleration mode
Reexamination Certificate
1998-10-15
2001-06-05
Solis, Erick (Department: 3747)
Internal-combustion engines
Engine speed regulator
Responsive to deceleration mode
Reexamination Certificate
active
06240898
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to the field of engine control and actuation systems for engine braking systems and on positive power, for internal combustion engines. Specifically, the invention relates to a method and apparatus for modifying exhaust valve motion travel in connection with fixed timing exhaust gas recirculation derived from the intake cam profile. In particular the valve motion travel is modified by limiting inner slave piston travel to a predetermined distance. This permits the advance of the closure of the valve during exhaust gas recirculation. This is accomplished by uncovering a vent hole in an outer slave piston to release fluid to drain thus limiting further travel of the inner slave piston and allowing the inner piston to return to the valve closed position.
OBJECTS OF THE INVENTION
It is an object of the present invention to provide a system for providing exhaust gas recirculation and compression release braking in an engine.
It is another object of the present invention to provide a system for providing exhaust gas recirculation and compression release braking in an engine that includes a valve actuation assembly for actuating the at least one exhaust valve that is capable of actuating the at least one exhaust valve in response to energy from the compression release retarding assembly to perform a compression release retarding operation and is also capable of actuating the at least one exhaust valve in response to energy from the exhaust gas recirculation assembly to perform an exhaust gas recirculation operation.
It is another object of the present invention to an assembly for modifying exhaust valve motion travel of at least one exhaust valve during a exhaust gas recirculation event.
It is another object of the present invention to an assembly for modifying exhaust valve motion travel of at least one exhaust valve during a fixed timing exhaust gas recirculation event. It is another object of the invention to provide a slave piston assembly that is capable of modifying the opening of at least one cylinder valve.
It is also an object of the present invention to provide a slave piston assembly that is capable of modifying the fixed timing opening of at least one cylinder valve.
It is also an object of the invention to provide exhaust valve EGR timing generated by the intake cam.
SUMMARY OF THE INVENTION
The present invention is directed to a system for providing exhaust gas recirculation and compression release braking in an engine. The system includes a compression release retarding assembly for supplying energy to actuate at least one exhaust valve assembly to perform a compression release retarding operation. The system also includes an exhaust gas recirculation assembly for supplying energy to actuate the at least one exhaust valve assembly to perform an exhaust gas recirculation operation. The system also includes a valve actuation assembly for actuating at least one exhaust valve. The valve actuating assembly is capable of actuating the at least one exhaust valve in response to energy from the compression release retarding assembly to perform a compression release retarding operation. The valve actuating assembly is also capable of actuating the at least one exhaust valve in response to energy from the exhaust gas recirculation assembly to perform an exhaust gas recirculation operation.
The valve actuating assembly may include an assembly for modifying exhaust valve motion travel of the at least one exhaust valve during the exhaust gas recirculation event. The exhaust gas recirculation event may be a fixed timing exhaust gas recirculation event.
The valve actuating assembly may include a housing assembly. The valve actuating assembly may also include a first piston assembly movably mounted within the housing assembly for operating the at least one exhaust valve assembly in response to the exhaust gas recirculation assembly to perform the exhaust gas recirculation event. The valve actuating assembly may further include a second piston assembly movably mounted within the housing assembly and operable with the first piston assembly for operating the at least one exhaust valve assembly in response to the compression release retarding assembly to perform the compression release retarding event. The first piston assembly may be slidably received within the second piston assembly.
The valve actuating assembly may also include an assembly for modifying the exhaust valve motion travel of the at least one exhaust valve during the exhaust gas recirculation event. The assembly for modifying the exhaust valve motion travel limits travel of the first piston assembly during the exhaust gas recirculation event. The exhaust gas recirculation event may be a fixed timing exhaust gas recirculation event.
The valve actuating assembly may further include an assembly for modifying exhaust valve motion travel of the at least one exhaust valve during the exhaust gas recirculation event. The assembly for modifying exhaust valve motion travel may include a movable assembly slidably received within the housing assembly. The movable assembly may be slidably received within the first piston assembly. The movable assembly may cooperate with the second piston assembly to modify the exhaust valve motion travel of the at least one exhaust valve during the exhaust gas recirculation event. The exhaust gas recirculation event may be a fixed timing exhaust gas recirculation event. The movable assembly limits travel of the first piston assembly during the exhaust gas recirculation event.
The present invention is also directed to a valve actuating assembly for actuating at least one valve. The valve actuating assembly may include a housing assembly. The valve actuating assembly may further include an actuating assembly for actuating at least one valve during a first valve operating event and a second valve operating event. The valve actuating assembly may further include an assembly for modifying valve motion travel of the at least one valve during at least one of the first valve operating event and the second valve operating event. The first valve operating event may be an exhaust gas recirculation event. The exhaust gas recirculation event may be a fixed timing exhaust gas recirculation event.
The actuating assembly may include a first or inner piston assembly movably mounted within the housing assembly for operating the at least one valve assembly during the first valve operating event. The actuating assembly may further include a second piston assembly movably mounted within the housing assembly and operable with the first or outer piston assembly for operating the at least one valve assembly during the second valve operating event. The assembly for modifying exhaust valve motion travel limits travel of the first piston assembly during the first valve operating event. The first piston assembly may be slidably received within the second piston assembly.
The assembly for modifying valve motion travel may include a movable assembly slidably received within the housing assembly. The movable assembly may be slidably received within the first piston assembly. The movable assembly preferably cooperates with the second piston assembly to modify the valve motion travel of the at least one valve during at least one of the first valve operating event and the second valve operating event. The movable assembly cooperates with the second piston assembly to modify the valve motion travel of the at least one valve during the first valve operating event, where the first valve operating event is an exhaust gas recirculation event.
The present invention is also directed to a valve actuating assembly or slave piston assembly for actuating at least one valve. The valve actuating assembly may include a housing assembly. The valve actuating assembly may further include an actuating assembly for actuating at least one valve during a first valve operating event and a second valve operating event. The valve actuating assembly may further include an assembly for modifying val
Meistrick Zdenek
Pitzi Vincent
Collier Shannon Scott PLLC
Diesel Engine Retarders, Inc.
Solis Erick
Yohannan David R.
LandOfFree
Slave piston assembly with valve motion modifier does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Slave piston assembly with valve motion modifier, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Slave piston assembly with valve motion modifier will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2475750