Abstract: A variable cam timing phaser arrangement is disclosed, comprising: a rotor having at least one vane; a stator co-axially surrounding the rotor, having at least one recess for receiving the at least one vane of the rotor, wherein the at least one vane divides the at least one recess into an first chamber and a second chamber; and a control assembly for regulating hydraulic fluid flow from the first chamber to the second chamber or vice-versa. The control assembly comprises a central on/off piloted valve for allowing or preventing fluid communication between the first and second chambers, and a remotely located solenoid-controlled actuator for controlling the on/off piloted valve. The present disclosure further relates to a method of controlling the timing of a camshaft in an internal combustion engine. The disclosure also relates to an internal combustion engine and a vehicle comprising the disclosed variable cam timing phaser arrangement.

Abstract: A variable cam timing phaser arrangement is disclosed, comprising: a rotor having at least one vane; a stator co-axially surrounding the rotor, having a recess for receiving the vane of the rotor, wherein the vane divides the recess into a first chamber and a second chamber; and a control assembly for regulating hydraulic fluid flow from the first chamber to the second chamber or vice-versa. The control assembly comprises a central on/off piloted valve allowing or preventing fluid flow along a first unidirectional flow path between the first and second chambers, and a central solenoid valve allowing or preventing fluid flow along a second unidirectional flow path between the first and second chambers in the opposite direction to the first flow path. Also disclosed are an integrated valve unit for use in the variable cam timing phaser arrangement, and a method of controlling the timing of a camshaft.

Abstract: A control valve for use in a cam timing phaser arrangement is disclosed comprising a cylindrical valve body, a rotational shuttle element coaxially located within a recess of the valve body, and a blocking pin. When using in a cam timing phaser arrangement having a first phasing chamber and a second phasing chamber, the control valve when non-actuated acts as a double check valve, preventing flow between chambers. Actuation of the blocking pin limits rotation of the rotational shuttle element and results in the control valve allowing flow in a single flow direction between phasing chambers. The allowed direction of flow can be controlled by controlling the timing of the deployment of the blocking pin. A cam timing phaser arrangement, internal combustion engine, and vehicle comprising such a control valve are also disclosed.

Abstract: A variable cam timing phaser arrangement is disclosed, comprising: a rotor having at least one vane; a stator co-axially surrounding the rotor, having a recess for receiving the vane of the rotor, wherein the vane divides the recess into a first chamber and a second chamber; and a control assembly for regulating hydraulic fluid flow from the first chamber to the second chamber or vice-versa. The control assembly comprises a central on/off piloted valve allowing or preventing fluid flow along a first unidirectional flow path between the first and second chambers, and a central solenoid valve allowing or preventing fluid flow along a second unidirectional flow path between the first and second chambers in the opposite direction to the first flow path. Also disclosed are an integrated valve unit for use in the variable cam timing phaser arrangement, and a method of controlling the timing of a camshaft.

Abstract: A variable cam timing phaser arrangement is disclosed, comprising: a rotor having at least one vane; a stator co-axially surrounding the rotor, having at least one recess for receiving the at least one vane, wherein the at least one vane divides the at least one recess into a first and second chambers; and a control assembly for regulating hydraulic fluid flow from the first chamber to the second chamber or vice-versa. The control assembly comprises a first check valve, a second check valve and a selective deactivation device. The check valves are arranged in series in a fluid passage between the first chamber and the second chamber. The selective deactivation device is deployable and is configured to selectively deactivate either the first check valve or the second check valve upon deployment. By timing the deployment of the deactivation device, the direction of flow between the first and second chambers can be controlled.

Abstract: A variable cam timing phaser arrangement is disclosed, comprising: a rotor having at least one vane; a stator co-axially surrounding the rotor, having at least one recess for receiving the at least one vane of the rotor, wherein the at least one vane divides the at least one recess into a first chamber and a second chamber; and a control assembly for regulating hydraulic fluid flow from the first chamber to the second chamber or vice-versa. The control assembly comprises a cam torque actuation control valve comprising a valve body and a hydraulic shuttle element. The HSE shuttles between two positions in response to overpressure in the first or second chamber, which prevents flow between the chambers. Deploying a blocking device blocks the HSE from attaining one of the two positions, thereby allowing unidirectional flow between the two chambers. By timing the deployment of the blocking device, the direction of flow can be controlled.

Abstract: A variable cam timing phaser arrangement is disclosed, comprising: a rotor having at least one vane; a stator co-axially surrounding the rotor, having at least one recess for receiving the at least one vane of the rotor, wherein the at least one vane divides the at least one recess into an first chamber and a second chamber; and a control assembly for regulating hydraulic fluid flow from the first chamber to the second chamber or vice-versa. The control assembly comprises a central on/off piloted valve for allowing or preventing fluid communication between the first and second chambers, and a remotely located solenoid-controlled actuator for controlling the on/off piloted valve. The present disclosure further relates to a method of controlling the timing of a camshaft in an internal combustion engine. The disclosure also relates to an internal combustion engine and a vehicle comprising the disclosed variable cam timing phaser arrangement.

Abstract: A variable cam timing phaser arrangement is disclosed, comprising: a rotor having at least one vane; a stator co-axially surrounding the rotor, having at least one recess for receiving the at least one vane of the rotor, wherein the at least one vane divides the at least one recess into a first chamber and a second chamber; and a control assembly for regulating hydraulic fluid flow from the first chamber to the second chamber or vice-versa. The control assembly comprises a cam torque actuation control valve comprising a valve body and a hydraulic shuttle element. The HSE shuttles between two positions in response to overpressure in the first or second chamber, which prevents flow between the chambers. Deploying a blocking device blocks the HSE from attaining one of the two positions, thereby allowing unidirectional flow between the two chambers. By timing the deployment of the blocking device, the direction of flow can be controlled.

Abstract: A variable cam timing phaser arrangement is disclosed, comprising: a rotor having at least one vane; a stator co-axially surrounding the rotor, having at least one recess for receiving the at least one vane, wherein the at least one vane divides the at least one recess into a first and second chambers; and a control assembly for regulating hydraulic fluid flow from the first chamber to the second chamber or vice-versa. The control assembly comprises a first check valve, a second check valve and a selective deactivation device. The check valves are arranged in series in a fluid passage between the first chamber and the second chamber. The selective deactivation device is deployable and is configured to selectively deactivate either the first check valve or the second check valve upon deployment. By timing the deployment of the deactivation device, the direction of flow between the first and second chambers can be controlled.

Abstract: A control valve for use in a cam timing phaser arrangement is disclosed comprising a cylindrical valve body, a rotational shuttle element coaxially located within a recess of the valve body, and a blocking pin. When using in a cam timing phaser arrangement having a first phasing chamber and a second phasing chamber, the control valve when non-actuated acts as a double check valve, preventing flow between chambers. Actuation of the blocking pin limits rotation of the rotational shuttle element and results in the control valve allowing flow in a single flow direction between phasing chambers. The allowed direction of flow can be controlled by controlling the timing of the deployment of the blocking pin. A cam timing phaser arrangement, internal combustion engine, and vehicle comprising such a control valve are also disclosed.