US 2026/0218632 A1 · HYDRAULIC CONTROL VALVE AND METHOD OF CONTROLLING A HYBRID CAM PHASER

Abstract

For a cam phaser capable of selectively operating in a CTA, OPA or maintenance mode of operation, a method of controlling the cam phaser comprises determining that a new engine operating state for the internal combustion engine is required, and further determining that a new cam phaser state is to be used to achieve the new engine operating state. The method further comprises switching operation of the cam phaser to the CTA mode to effectuate transition to the new cam phaser state. In an embodiment, while operating in the CTA mode, if the new cam phaser state has not been achieved, the method further comprises switching operation of the cam phaser to the OPA mode to effectuate transition to the new cam phaser state. A hydraulic control valve in accordance with such operation comprises a shuttle valve having a pair of opposed check valves disposed in a bore formed therein.

Claims18

Dependent claims

A method of controlling a cam phaser of the type used in an internal combustion engine, the cam phaser configured to selectively operate according to a cam torque actuated (CTA) mode of operation, an oil pressure actuated (OPA) mode of operation or a maintenance mode of operation, the method comprising:

determining a new engine operating state for the internal combustion engine is required;
determining a new cam phaser state to be used to achieve the new engine operating state;
switching operation of the cam phaser to the CTA mode to effectuate transition to the new cam phaser state;
and
while operating in the CTA mode, if the new cam phaser state has not been achieved, switching operation of the cam phaser to the OPA mode to effectuate transition to the new cam phaser state.

2 more elements

A hydraulic control valve for use in a cam phaser, comprising:

a housing having an axially extending central bore formed in the housing and having a radially extending first port configured for fluid communication with at least one retard cavity of the cam phaser and a radially extending second port configured for fluid communication with at least one advance cavity of the cam phaser;
a shuttle valve slidably disposed within the central bore and having an axially extending shuttle valve bore formed in the shuttle valve, the shuttle valve further having a central radial opening, a first lateral radial opening and a second lateral radial opening in fluid communication with the shuttle valve bore;
and
a pair of opposed check valves disposed in the shuttle valve bore,
wherein, in a first mode of operation corresponding to at least one first mode position of the shuttle valve, hydraulic fluid flows through the first and second ports and does not flow through the shuttle valve bore,
and wherein, in a second mode of operation corresponding to at least one second mode position of the shuttle valve, hydraulic fluid flows through the first and second ports and the shuttle valve bore via one or more of the central radial opening, the first lateral radial opening or the second lateral radial opening, thereby causing at least one check valve of the pair of opposed check valves to open.

3 more elements

Dependencies are inferred from the claim text.

Hydraulic control valve and method of controlling a hybrid cam phaser

Life of this patent

Hydraulic control valve and method of controlling a hybrid cam phaser

Life of this patent

Abstract

Claims18