The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 03, 2008
Filed:
May. 17, 2005
Thomas Tsoi-hei MA, Essex, GB;
Hua Zhao, Buckinghamshire, GB;
Thomas Tsoi-Hei Ma, Essex, GB;
Hua Zhao, Buckinghamshire, GB;
Brunel University, Uxbridge, Middlesex, GB;
Abstract
A method is disclosed for operating an internal combustion engine of the type having an engine cylinder with a reciprocating piston, first and second intake ports for admitting gas from an ambient air supply into the engine cylinder, first and second intake valves each arranged between a respective one of the intake ports and the engine cylinder, a non-return valve arranged in the second of the intake ports at a distance from the second intake valve and oriented to allow gas to flow only towards the engine cylinder, and a variable valve actuating system for controlling the opening and closing of at least the second intake valve. In the method of the invention, in at least one operating mode of the engine, the second intake valve is opened and closed, while the cylinder is fully isolated from the ambient air, to permit gas transfer between the cylinder and an auxiliary chamber temporarily defined by the part of the second intake port lying between the second intake valve and the non-return valve. The second intake valve is opened at a time when the pressure in the auxiliary chamber is greater than the pressure of the ambient air supply such that no gas escapes past the non-return valve.