Engine braking with fuel injection for internal combustion engines
AssigneeCummins Inc.
InventorsJames A. DODS, Alan R. BENNETT
Life of this patent
Estimating the term…
Abstract
An internal combustion engine system includes an engine with a plurality of cylinders, a fueling system to provide fuel to the plurality of cylinders, an air intake system to provide air to the plurality of cylinders through respective ones of a plurality of intake valves, and an exhaust system to release exhaust gas from the plurality of cylinders through respective ones of a plurality of exhaust valves. During engine braking, an amount of fuel is injected into one or more cylinders involved in the engine braking during the compression stroke thereof to improve engine braking performance.
Claims20
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 the plurality of cylinders, wherein at least a portion of the plurality of cylinders are operable to be deactivated in response to a cylinder deactivation condition;
- and
- braking the internal combustion engine in response to a braking condition, wherein braking the internal combustion engine includes adjusting an exhaust valve opening and closing timing of one or more of the portion of the plurality of cylinders configured to be able to be deactivated to provide compression release braking after injecting fuel in the one or more of the portion of the cylinders during a compression stroke thereof in response to the braking condition.
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 in the plurality of cylinders;
- 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 operable to determine a braking condition, wherein the controller, in response to the braking condition, is configured to:
- adjust an exhaust valve opening and closing timing and an intake valve opening and closing timing of one or more of the plurality of cylinders via the valve actuation mechanism to produce two stroke compression release braking;
- and
- inject fuel into the one or more of a plurality of cylinders of the internal combustion engine providing compression release braking during a compression stroke thereof.
An apparatus, comprising:
- a controller configured to receive signals from a plurality of sensors associated with operation of an internal combustion engine, wherein the controller is configured to determine a braking condition and, in response to the braking condition, provide an engine braking command that:
- adjusts an exhaust valve opening and closing timing and an intake valve opening and closing timing of one or more of the plurality of cylinders to produce two stroke compression release braking;
- and
- injects fuel into the one or more of a plurality of cylinders of the internal combustion engine providing compression release braking during a compression stroke thereof.
Dependencies are inferred from the claim text.