Methods and systems are provided for coordinating water usage with spark usage based on the effect on an engine torque ratio. Water is injected based on torque ratio at a current spark timing relative to torque ratio at borderline knock to improve the impact of the water injection on the engine perf
Methods and systems are provided for coordinating water usage with spark usage based on the effect on an engine torque ratio. Water is injected based on torque ratio at a current spark timing relative to torque ratio at borderline knock to improve the impact of the water injection on the engine performance. Manifold water injection and direct water injected are coordinated based on intake manifold humidity.
대표청구항▼
1. A method, comprising: adjusting an amount of water injection into an engine responsive to a torque ratio at a current spark timing relative to a torque ratio at borderline knock, and further based on sensed humidity in an engine intake manifold. 2. The method of claim 1, wherein the torque ratio
1. A method, comprising: adjusting an amount of water injection into an engine responsive to a torque ratio at a current spark timing relative to a torque ratio at borderline knock, and further based on sensed humidity in an engine intake manifold. 2. The method of claim 1, wherein the torque ratio at the current spark timing includes the torque ratio before the adjusted amount of water is injected into the engine. 3. The method of claim 1, wherein the adjusting includes reducing the amount of water injected into the engine as the torque ratio at the current spark timing approaches a threshold, the threshold based on the torque ratio at borderline knock. 4. The method of claim 1, wherein the adjusting further based on the sensed humidity includes increasing the amount of water injected into the intake manifold of the engine while the torque ratio at the current spark timing is below the threshold until the sensed humidity in the intake manifold reaches a limit. 5. The method of claim 4, further comprising, after reaching the limit, direct injecting water into an engine cylinder until the torque ratio at the current spark timing reaches the threshold, and then disabling water injection. 6. The method of claim 1, wherein the adjusting includes reducing the amount of water injected into the engine responsive to the torque ratio at the current spark timing exceeding a threshold for longer than a duration, the threshold based on the torque ratio at borderline knock. 7. The method of claim 1, wherein the adjusting includes reducing the amount of water injected into the engine as the torque ratio at the current spark timing approaches the torque ratio at borderline knock. 8. The method of claim 1, further comprising determining the current spark timing based on each of a current engine speed and a current engine load, and further based on feedback from an engine knock sensor. 9. The method of claim 1, further comprising selectively deactivating one or more engine cylinders responsive to a current engine load being lower than a threshold, and adjusting a duration of operating with the one or more cylinders deactivated based on the torque ratio at the current spark timing with the adjusted amount of water injection relative to the torque ratio at borderline knock. 10. The method of claim 9, wherein the adjusting includes: extending engine operation with the one or more cylinders deactivated when a difference between the torque ratio at the current spark timing with the adjusted amount of water injection and the torque ratio at borderline knock exceeds a threshold difference; andreactivating the one or more deactivated cylinders while disabling water injection when the difference between the torque ratio at the current spark timing with the adjusted amount of water injection and the torque ratio at borderline knock is less than the threshold difference. 11. The method of claim 1, further comprising advancing spark timing from the current spark timing while injecting the adjusted amount of water. 12. A method, comprising: responsive to a change in engine load,selecting between operating an engine with one or more cylinders deactivated while water is injected into an intake manifold, and operating the engine with all cylinders active and water injection disabled based on a torque ratio at a current spark timing relative to a torque ratio at borderline knock. 13. The method of claim 12, wherein the selecting is further based on sensed humidity in the intake manifold, the humidity sensed via an intake manifold sensor. 14. The method of claim 13, wherein operating the engine with one or more cylinders deactivated includes operating with a first spark timing, and operating the engine with all cylinders active includes operating with a second, different spark timing, and wherein selecting based on the torque ratio includes selecting based on a comparison of each of the torque ratio at the first spark timing and the torque ratio at the second spark timing to the torque ratio at borderline knock. 15. The method of claim 14, wherein the second spark timing is more retarded than the first spark timing. 16. The method of claim 14, wherein the selecting includes: operating the engine with the one or more cylinders deactivated and water injected into the intake manifold when a first difference between the torque ratio at the first spark timing and the torque ratio at borderline knock is larger than a second difference between the torque ratio at the second spark timing and the torque ratio at borderline knock; andoperating the engine with all cylinders active and water injection disabled when the second difference is larger than the first difference. 17. The method of claim 16, further comprising: while operating the engine with the one or more cylinders deactivated and water injection enabled, responsive to the torque ratio at the first spark timing being higher than a threshold for a duration, reactivating previously deactivated cylinders and disabling water injection, the threshold based on the torque ratio at borderline knock. 18. The method of claim 16, wherein the selecting further based on sensed humidity includes injecting water into the intake manifold until the sensed humidity is at a threshold humidity, and then disabling water injection and reactivating the one or more deactivated cylinders even if the first difference is larger than the second difference.
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