초록 ▼

A method may include restricting cam movement while the vehicle is moving in response to an oil pressure below a threshold oil pressure, and an engine speed below a threshold engine speed, and during a vehicle stopped condition, overriding the restricted cam movement. In one example, the vehicle sto

A method may include restricting cam movement while the vehicle is moving in response to an oil pressure below a threshold oil pressure, and an engine speed below a threshold engine speed, and during a vehicle stopped condition, overriding the restricted cam movement. In one example, the vehicle stopped condition may include the oil over-temperature and the load above the threshold load.

대표청구항 ▼

1. A method, comprising: operating a vehicle with an oil pressure below a threshold oil pressure, and an engine rotating at a speed below a threshold engine speed;in response to the oil pressure below the threshold oil pressure, and the engine rotating at the speed below the threshold engine speed,

1. A method, comprising: operating a vehicle with an oil pressure below a threshold oil pressure, and an engine rotating at a speed below a threshold engine speed;in response to the oil pressure below the threshold oil pressure, and the engine rotating at the speed below the threshold engine speed, restricting cam movement of cams by pinning the cams while the vehicle is moving;operating the vehicle with a first available torque being insufficient to meet a first requested torque during a first vehicle stopped condition, where the first vehicle stopped condition includes the engine rotating at the speed below the threshold engine speed with the oil pressure below the threshold oil pressure;during the first vehicle stopped condition, determining the first available torque, determining the first requested torque, and overriding the restricted cam movement in response to the first available torque being insufficient to meet the first requested torque where overriding the restricted cam movement includes unlocking the cams pinned during restriction of the cam movement, repositioning the cams, reducing engine valve overlap via the cams, and synchronizing the cams;operating the vehicle with a second available torque being sufficient to meet a second requested torque during a second vehicle stopped condition; andduring the second vehicle stopped condition, determining the second available torque, determining the second requested torque, and not overriding the restricted cam movement to continue restricting cam movement in response to the second available torque being sufficient to meet the second requested torque. 2. The method of claim 1, wherein overriding the restricted cam movement includes transitioning from controlling a cam timing in an open-loop manner to controlling the cam timing in a closed-loop manner. 3. The method of claim 2, further comprising advancing a spark timing to MBT to increase the first available torque. 4. The method of claim 2, further comprising shutting off an alternator to increase the first available torque. 5. The method of claim 2, further comprising decoupling an air conditioning compressor to increase the first available torque. 6. The method of claim 2, further comprising increasing an oil pump output to increase the oil pressure and aid in cam positioning to increase the first available torque. 7. The method of claim 2, further comprising increasing a rich air-fuel mixture to the engine to increase the first available torque. 8. The method of claim 2, further comprising increasing an engine oil cooling to reduce oil temperature, increase oil pressure, and aid cam positioning to increase the first available torque. 9. The method of claim 1, further comprising during the first vehicle stopped condition, disabling cam positioning control diagnostics. 10. The method of claim 1, wherein the first vehicle stopped condition comprises an oil over-temperature and a load above a threshold load. 11. The method of claim 1, further comprising, during the first vehicle stopped condition, overriding the restricted cam movement to increase the first available torque in response to the first available torque being insufficient to operate a front end accessory drive. 12. The method of claim 1, further comprising, during the first vehicle stopped condition, overriding the restricted cam movement to increase an intake vacuum in response to the intake vacuum being insufficient to launch the vehicle. 13. The method of claim 1, wherein overriding the restricted cam movement comprises advancing an intake cam to increase the first available torque. 14. The method of claim 1, wherein overriding the restricted cam movement comprises controlling a cam repositioning rate based on a cam position relative to a position of one or more other cams. 15. The method of claim 1, wherein overriding the restricted cam movement comprises controlling a cam repositioning based on a cam response to repositioning commands. 16. The method of claim 1, where unlocking and repositioning the cams during the first vehicle stopped condition includes decreasing synchronization of the cams prior to synchronizing the cams. 17. A method, comprising: during a first vehicle moving condition, adjusting cam timing responsive to a first requested torque and a first requested vehicle speed, but irrespective of a first available torque, and limiting a cam timing adjustment of cams responsive to an oil over-temperature condition at loads exceeding a load threshold via pinning the cams;operating in the first vehicle moving condition with the oil over-temperature condition at loads exceeding the load threshold;during a second non-moving vehicle condition following the first vehicle moving condition, where the second non-moving vehicle condition includes the oil over-temperature condition, determining a second available torque and determining a second requested torque, and overriding the cam timing adjustment limits of the cams in response to the second available torque being insufficient to meet the second requested torque, where overriding the cam timing adjustment limits includes unlocking the cams pinned during the first vehicle moving condition, repositioning the cams, reducing engine valve overlap via the cams, and synchronizing the cams;operating in the second non-moving vehicle condition with the second available torque being insufficient to meet the second requested torque;during the second non-moving vehicle condition following the first vehicle moving condition, where the second non-moving vehicle condition includes the oil over-temperature condition, determining a third available torque and determining a third requested torque, and not overriding the cam timing adjustment limits in response to the third available torque being sufficient to meet the third requested torque; andoperating in the second non-moving vehicle condition with the third available torque being sufficient to meet the third requested torque. 18. The method of claim 17, wherein overriding the cam timing adjustment limits further includes advancing a cam timing. 19. The method of claim 17, wherein synchronizing the cams includes retarding one or more of the cams and reducing cam phase angle differences between the cams. 20. A vehicle, comprising: an engine;oil pressure actuated cams; anda controller with executable instructions for: during a first vehicle moving condition, determining a requested torque and adjusting cam timing of the oil pressure actuated cams responsive to the requested torque and a requested vehicle speed, but irrespective of an available torque, and limiting the cam timing adjustment by pinning the oil pressure actuated cams responsive to determining an oil over-temperature condition at loads greater than a threshold load; andduring a second non-moving vehicle condition following the first vehicle moving condition, where the second non-moving vehicle condition includes the oil over-temperature condition, determining the available torque and determining the requested torque, andoverriding the cam timing adjustment limits in response to the available torque being insufficient to meet the requested torque during the second non-moving vehicle condition, where overriding the cam timing adjustment limits includes unlocking the oil pressure actuated cams pinned during the first vehicle moving condition, repositioning the oil pressure actuated cams, reducing engine valve overlap via the oil pressure actuated cams, and synchronizing the oil pressure actuated cams, andnot overriding the cam timing adjustment limits in response to the available torque being sufficient to meet the requested torque,where the engine is spinning during both the first vehicle moving condition and the second non-moving vehicle condition.