Multiple displacement system for an engine
View Patent ↗A cylinder deactivation arrangement for an engine is provided. The arrangement includes an engine with main oiling circuit passages and lifter oil gallery control circuit passages formed internal to a cylinder block of the engine. The lifter oil gallery control circuit is arranged so as to provide an oil flow path internal to the cylinder block from the main oiling circuit to the deactivating lifter. A lifter is positioned in the cylinder block and arranged in fluid communication with the lifter oil gallery control circuit. A control valve is positioned in the cylinder block and arranged in fluid communication with the main oiling circuit and the lifter oil gallery control circuit. The control valve is arranged to allow selective fluid communication of oil from the main oiling circuit to the lifter oil gallery control circuit to selectively control actuation of the lifter.
1. An engine having an arrangement for deactivating a predetermined cylinder, the engine comprising:
a cylinder block;
a main oiling circuit with passages formed internal to the cylinder block;
a deactivating lifter positioned internal to the cylinder block and arranged to be selectively actuated upon flow of oil to the deactivating lifter at a pressure substantially of the main oiling circuit;
a lifter oil gallery control circuit formed internal to the cylinder block for providing oil to the deactivating lifter additional to oil provided to the lifter from the main oiling circuit, and the lifter oil gallery control circuit is arranged so that an oil flow path from the main oiling circuit to the deactivating lifter extends internal to the cylinder block; and
a control valve in fluid communication with the main oiling circuit and the lifter oil gallery control circuit;
wherein the control valve is arranged to allow selective flow of oil at a pressure substantially of the main oiling circuit from the main oiling circuit to the lifter oil gallery control circuit to control actuation of the lifter.
2. The engine of claim 1 , wherein the lifter oil gallery control circuit includes:
a deactivating lifter bore formed in the cylinder block, the deactivating lifter bore arranged in fluid communication with the lifter oil gallery control circuit, wherein the deactivating lifter is positioned within the deactivating lifter bore; and
a control valve bore formed in the cylinder block, the control valve bore is arranged in fluid communication with the main oiling circuit and the lifter oil gallery control circuit, the control valve is positioned within the control valve bore.
3. The engine of claim 1 , wherein the lifter gallery control circuit is arranged to purge air from the lifter oil gallery control circuit.
4. The engine of claim 1 , wherein the engine further comprises a plurality of selectively deactivatable cylinders, and a dedicated lifter oil gallery control circuit is provided for each deactivatable cylinder.
5. The engine of claim 4 , wherein the engine comprises eight cylinders and four of the eight cylinders are arranged to be selectively deactivated.
6. The engine of claim 1 , further comprising a deactivating lifter for each valve of a deactivatable cylinder.
7. The engine of claim 1 , wherein the deactivating lifter is arranged to be selectively reactivated in response to interruption of the flow of oil to the deactivating lifter at a pressure substantially of the main oiling circuit thereby reactivating the respective valve of the cylinder to input from the valvetrain.
8. The engine of claim 1 , wherein the control valve is arranged to be actuated in response to a signal from an engine controller.
9. The engine of claim 1 , wherein the control valve is further arranged to allow flow of low pressure oil to pass through the control valve into the lifter oil gallery control circuit to maintain a constant supply of oil in the circuit when the control valve is not actuated.
10. The engine of claim 1 , wherein the control valve comprises a solenoid controlled valve.