Patent ID: 6584942
Filing Date: 2003-07-01
Classification: F01L

Abstract:
Apparatus for selectively deactivating specified cylinders of an engine, said apparatus comprising:switchable hydraulic lash adjusters forming part of a valve train for actuating engine valves of the specified cylinders and operative to selectively actuate or release their respective valves in response to an increase or decrease of oil pressure supplied to switching portions of the lash adjusters; a gallery carrying said lash adjusters and including oil passages connecting with the switching portions; a pressure oil supply connected with said oil passages for providing pressure oil to the switching portions of the lash adjusters; a three-way valve connected with the pressure oil supply and operative to close or open communication of the oil supply with said passages, the valve having an exhaust port alternately connectable with said passages to relieve oil pressure in the passages when communication with the pressure oil supply is closed; and a bypass between the pressure oil supply and said oil passages, the bypass carrying oil to at least portions of the oil passages to purge air from said passage portions when the three-way valve exhaust port is open.