A method of adapting operation of a variable geometry turbocharger having a variable position vane mechanism with movable vanes is disclosed. The method includes performing at time T1 a vane sweep between open-limit and closed-limit positions to identify an initial range of movement of the mechanism
A method of adapting operation of a variable geometry turbocharger having a variable position vane mechanism with movable vanes is disclosed. The method includes performing at time T1 a vane sweep between open-limit and closed-limit positions to identify an initial range of movement of the mechanism and storing in controller's memory the initial range of movement. The method additionally includes performing at time T2 a vane sweep between the open-limit and closed-limit positions to identify a current range of movement of the mechanism and storing in controller's memory the current range of movement. The method also includes comparing the current range with the initial range. Furthermore, the method includes replacing in controller's memory the initial range with the current range if the current range is equal to or greater than a predetermined range to thereby adapt the operation of the turbocharger to the mechanism's wear between T1 and T2.
대표청구항▼
1. A method of adapting operation of a variable geometry turbocharger (VGT) having a turbine housing, a turbine wheel retained inside the turbine housing and configured to be rotated by post-combustion gasses, wherein the turbine housing defines an inlet to the turbine wheel, and a variable position
1. A method of adapting operation of a variable geometry turbocharger (VGT) having a turbine housing, a turbine wheel retained inside the turbine housing and configured to be rotated by post-combustion gasses, wherein the turbine housing defines an inlet to the turbine wheel, and a variable position vane mechanism having a plurality of movable vanes arranged at the inlet, the method comprising: commanding, via a controller having a memory, the variable position vane mechanism to perform at a time T1 a sweep of the plurality of vanes between an open-limit position and a closed-limit position to identify an initial range of movement of the vane mechanism;storing in the memory of the controller the identified initial range of movement of the vane mechanism;commanding, via the controller, the variable position vane mechanism to perform at a time T2 the sweep of the plurality of moveable vanes between the open-limit position and the closed-limit position to identify a current range of movement of the vane mechanism;storing in the memory of the controller the identified current range of movement of the vane mechanism;comparing, via the controller, the current range of movement with the initial range of movement of the vane mechanism; andreplacing in the memory of the controller the initial range of movement of the vane mechanism with the current range of movement of the vane mechanism if the current range of movement is equal to or greater than a predetermined range of movement stored in the memory of the controller to thereby adapt the operation of the VGT to the wear of the vane mechanism between the time T1 and the time T2. 2. The method of claim 1, further comprising activating via the controller a sensory indicator if the current range of movement of the vane mechanism is less than the predetermined range of movement. 3. The method of claim 2, wherein the sensory indicator is at least one of a numerical code programmed into the controller and a warning light. 4. The method of claim 1, wherein the variable position vane mechanism includes an actuator configured to perform the sweep of the plurality of vanes and communicate the initial and current ranges of movement of the vane mechanism to the controller. 5. The method of claim 1, wherein the VGT is mounted on an internal combustion engine in a motor vehicle, and wherein the method is performed at one of every vehicle key-on and every vehicle key-off. 6. The method of claim 5, wherein the controller is a central processing unit arranged on the vehicle and configured to regulate operation of the engine. 7. The method of claim 6, further comprising initializing the method by assessing via the controller whether established enabling criteria have been met prior to identifying the initial range of movement of the vane mechanism. 8. The method of claim 7, wherein the method is performed at every vehicle key-off, and wherein the established enabling criteria include an ambient temperature being greater than a preset value, engine air intake temperature being within a predetermined acceptable range, no presence of VGT operation faults, and no presence of vane mechanism faults. 9. A vehicle comprising: an internal combustion engine having: a cylinder configured to receive an air-fuel mixture for combustion therein;a reciprocating piston disposed inside the cylinder and configured to exhaust post-combustion gasses from the cylinder; anda variable geometry turbocharger (VGT) including: a turbine housing;a turbine wheel retained inside the turbine housing and configured to be rotated by the post-combustion gasses, wherein the turbine housing defines an inlet to the turbine wheel;a variable position vane mechanism having a plurality of movable vanes arranged at an inlet to the turbine wheel; anda compressor wheel mounted on the shaft between the first and second ends and configured to pressurize an airflow being received from the ambient for delivery to the cylinder; anda controller having a memory and configured to regulate operation of the VGT by: commanding the variable position vane mechanism to perform at a time T1 a sweep of the plurality of vanes between an open-limit position and a closed-limit position to identify an initial range of movement of the vane mechanism;storing in the memory the identified initial range of movement of the vane mechanism;commanding the variable position vane mechanism to perform at a time T2 a sweep of the plurality of vanes between the open-limit position and the closed-limit position to identify a current range of movement of the vane mechanism;storing in the memory the identified current range of movement of the vane mechanism;comparing the current range of movement with the initial range of movement of the vane mechanism; andreplacing in the memory the initial range of movement of the vane mechanism with the current range of movement of the vane mechanism if the current range of movement is equal to or greater than a predetermined range of movement stored in the memory of the controller to thereby adapt operation of the VGT to the wear of the vane mechanism between the time T1 and the time T2. 10. The vehicle of claim 9, further comprising a sensory indicator, wherein the controller is configured to activate the sensory indicator if the current range of movement of the vane mechanism is less than the predetermined range of movement. 11. The vehicle of claim 10, wherein the sensory indicator is at least one of a numerical code programmed into the controller and a warning light. 12. The vehicle of claim 9, wherein the variable position vane mechanism includes an actuator configured to perform the sweep of the plurality of vanes and communicate the initial and current ranges of movement of the vane mechanism to the controller. 13. The vehicle of claim 9, wherein the controller regulates operation of the VGT at one of every vehicle key-on and every vehicle key-off. 14. The vehicle of claim 13, wherein the controller is a central processing unit configured to regulate operation of the engine. 15. The vehicle of claim 14, wherein the controller is configured to initialize regulation of the VGT by assessing whether established enabling criteria have been met prior to identifying the initial range of movement of the vane mechanism. 16. The vehicle of claim 15, wherein the controller regulates operation of the VGT at every vehicle key-off, and wherein the established enabling criteria include an ambient temperature being greater than a preset value, engine air intake temperature being within a predetermined acceptable range, no presence of VGT operation faults, and no presence of vane mechanism faults. 17. A method of adapting operation of a variable geometry turbocharger (VGT) having a turbine wheel and a variable position vane mechanism having a plurality of vanes arranged at an inlet to the turbine wheel to wear of the vane mechanism, the method comprising: commanding, via a controller having a memory, the variable position vane mechanism to perform at a time T1 a sweep of the plurality of vanes between an open-limit position and a closed-limit position to identify an initial range of movement of the vane mechanism;storing in the memory of the controller the identified initial range of movement of the vane mechanism;commanding, via the controller, the variable position vane mechanism to perform at a time T2 a vane sweep between an open-limit position and a closed-limit position to identify a current range of movement of the vane mechanism;storing in the memory of the controller the identified current range of movement of the vane mechanism;comparing, via the controller, the current range of movement with the initial range of movement of the vane mechanism;replacing in the memory of the controller the initial range of movement of the vane mechanism with the current range of movement of the vane mechanism if the current range of movement is equal to or greater than a predetermined range of movement stored in the memory of the controller to thereby adapt operation of the VGT to the wear of the vane mechanism between the time T1 and the time T2; andactivating, via the controller, a sensory indicator if the current range of movement of the vane mechanism is less than the predetermined range of movement.
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