714 results about "Cylinder Valve" patented technology

A method for calculating transient fuel wall wetting characteristics of an operating engine is described. The method accounts for cylinder valve deactivation of cylinders in the engine in calculating the dynamic fueling compensation. In one example, fuel vaporization effects from fuel puddles in deactivated cylinders is considered when calculating the fueling compensation for active cylinders.

Systems and methods are provided for operating an internal combustion engine including a variable cam timing (VCT) mechanism in cooperation with a plurality of deactivatable cylinders, each cylinder with a plurality of cylinder valves. One example method comprises, operating at a first cylinder valve timing before a transition of reactivating deactivated cylinders, and, before the transition, advancing cylinder valve timing from the first valve timing, where after the transition the cylinder valve timing remains at a second valve timing, the second valve timing advanced relative to the first valve timing.

The present invention relates to a natural gas hydrate core under-pressure transfer method, which comprises: establishing end-to-end connection between a pressure keeping cylinder filled with a core tube and a transfer bin having the specification equivalent to the pressure keeping cylinder, conveying the core tube in the pressure keeping cylinder into the transfer bin, sealing the transfer bin, and disconnecting the connection of the pressure keeping cylinder, wherein the pressure of the transfer bin and the initial state pressure of the pressure keeping cylinder are always maintained the same during the steps. The invention further relates to an apparatus applying the method, wherein the opposite connection ends of the pressure keeping cylinder and the transfer bin are respectively connected with a pressure keeping cylinder valve and a transfer bin valve, the valves are sealed and communicated through a flange, and the internals of the pressure keeping cylinder and the transfer bin respectively establish a connection with a pressure balancing control system. According to the present invention, the natural gas hydrate is in the under-pressure state, such that it is ensured that gas, pore water and other components in the core are not changed, and the detected data after the core treatment is close to the in situ situation so as to provide basis for analysis of natural gas hydrate characteristics and determination of reserves.

A method for operating an engine having at least a first and second cylinder [group], the first cylinder having a first electrically actuated valve and the second cylinder having a second electrically actuated valve, comprising of operating the first cylinder with a spark timing more retarded than a spark timing of a second cylinder, where during said operation, said first cylinder operates with a first operation of said first electrically actuated valve and said second cylinder operates with a second operation of said second electrically actuated valve, where said first operation is different from said second operation.