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US 11,512,653 B2Granted
Valve train with cylinder deactivation and compression release
AssigneeCummins Inc.
InventorsAnthony Kyle Perfetto, Anshul Shambhav, Adam C. Cecil, Ryan Edward Schultz
Life of this patent
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Abstract
An internal combustion engine system includes an engine with a plurality of pistons housed in respective ones of a plurality of cylinders, an air intake system to provide air to the plurality of cylinders through respective ones of a plurality of intake valves, an exhaust system to release exhaust gas from the plurality of cylinders through respective one of a plurality of exhaust valves. A valve train is provided for cylinder deactivation of a first part of the plurality of cylinders and compression release braking on a second part of the plurality of cylinders.
Claims17
A method, comprising:
- operating an internal combustion engine system including an internal combustion engine with a plurality of cylinders that receive a charge flow for combustion of a fuel provided to at least a portion of the plurality of cylinders;
- deactivating at least part of the plurality of cylinders in response to a cylinder deactivation condition;
- and
- compression release braking the internal combustion engine in response to a braking condition by adjusting at least an exhaust valve opening and closing timing of cylinders involved in the compression release braking, wherein braking condition is distinct from the cylinder deactivation condition, wherein compression release braking the internal combustion engine includes increasing a braking amount by switching from a first compression release braking to a second compression release braking.
1 more element
A method, comprising:
- operating an internal combustion engine system including an internal combustion engine with a plurality of cylinders that receive a charge flow for combustion of a fuel provided to at least a portion of the plurality of cylinders;
- deactivating at least part of the plurality of cylinders in response to a cylinder deactivation condition;
- and
- in response to a braking condition, reducing the charge flow, adjusting at least an exhaust valve opening and closing timing of cylinders involved in compression release braking the internal combustion engine to provide four stroke compression release braking after reducing the charge flow, and increasing the charge flow to increase a braking amount while providing four stroke compression release braking, wherein braking condition is distinct from the cylinder deactivation condition.
1 more element
A system, comprising:
- an internal combustion engine including a plurality of cylinders that receive a charge flow from an intake system and an exhaust system for receiving exhaust gas produced by combustion of a fuel provided to at least a portion of the plurality of cylinders;
- a plurality of sensors operable to provide signals indicating operating conditions of the system;
- a valve actuation mechanism configured to control an opening and closing timing of exhaust valves and intake valves associated with the plurality of cylinders;
- and
- a controller connected to the plurality of sensors operable to interpret one or more signals from the plurality of sensors, wherein the controller, in response to a cylinder deactivation condition, is configured to control the valve actuation mechanism to deactivate part of the plurality of cylinders and, in response to a braking condition, provide a compression release braking by adjusting a timing of an exhaust valve opening and an exhaust valve closing of cylinders involved in the compression release braking, wherein the controller is configured to increase a braking amount by switching from a first compression release braking to a second compression release braking.
2 more elements
A system, comprising:
- an internal combustion engine including a plurality of cylinders that receive a charge flow from an intake system that includes an intake throttle and an exhaust system for receiving exhaust gas produced by combustion of a fuel provided to at least a portion of the plurality of cylinders;
- a plurality of sensors operable to provide signals indicating operating conditions of the system;
- a valve actuation mechanism configured to control an opening and closing timing of exhaust valves and intake valves associated with the plurality of cylinders;
- and
- a controller connected to the plurality of sensors operable to interpret one or more signals from the plurality of sensors, wherein the controller, in response to a cylinder deactivation condition, is configured to control the valve actuation mechanism to deactivate part of the plurality of cylinders and, in response to a braking condition, provide a compression release braking by adjusting a timing of an exhaust valve opening and an exhaust valve closing of cylinders involved in the compression release braking, wherein the controller is configured to, in response to the braking condition, modulate the intake throttle to reduce the charge flow, adjust the exhaust valve opening and closing timing to provide four stroke compression release braking after reducing the charge flow, and increase the charge flow via the intake throttle to increase a braking amount while providing four stroke compression release braking.
2 more elements
An apparatus, comprising:
- a controller for connection to a plurality of sensors configured to interpret signals from the plurality of sensors associated with operation of an internal combustion engine, wherein the controller is further configured to determine a cylinder deactivation condition from the signals of the plurality of sensors and provide a cylinder deactivation command to deactivate part of a plurality of cylinders of the internal combustion engine in response to the cylinder deactivation condition, and wherein the controller is further configured to determine a braking condition from the signals of the plurality of sensors and provide a compression release braking by adjusting a timing of an exhaust valve opening and an exhaust valve closing of cylinders involved in the compression release braking, wherein the controller is configured to increase a braking amount by switching from a first compression release braking to a second compression release braking.
Dependencies are inferred from the claim text.