Methods and systems for driveline sailing mode entry
First Claim
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1. A driveline operating method, comprising:
- operating an engine and providing engine torque to a driveline propelling a vehicle via a torque converter in response to a desired torque being greater than a threshold driveline integrated starter/generator torque; and
operating the engine, opening a driveline clutch, and not providing engine torque to the driveline in response to the desired torque being less than the threshold driveline integrated starter/generator torque and greater than a threshold engine cranking torque.
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Abstract
Systems and methods for improving operation of a hybrid vehicle are presented. In one example, entry conditions for entering a driveline sailing mode are described. Driveline sailing mode may improve driveline torque response and vehicle drivability.
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Citations
18 Claims
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1. A driveline operating method, comprising:
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operating an engine and providing engine torque to a driveline propelling a vehicle via a torque converter in response to a desired torque being greater than a threshold driveline integrated starter/generator torque; and operating the engine, opening a driveline clutch, and not providing engine torque to the driveline in response to the desired torque being less than the threshold driveline integrated starter/generator torque and greater than a threshold engine cranking torque. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A driveline operating method, comprising:
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rotating an engine and providing engine torque to a driveline propelling a vehicle in response to a desired torque being greater than a threshold driveline integrated starter/generator torque with a disconnect clutch closed; rotating the engine and not providing engine torque to the driveline in response to the desired torque being less than the threshold driveline integrated starter/generator torque and greater than a threshold engine cranking torque with the disconnect clutch closed open; and not rotating the engine in response to the desired torque being less than the threshold engine cranking torque. - View Dependent Claims (9, 10, 11, 12)
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13. A vehicle system, comprising:
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an engine; a dual mass flywheel including a first side mechanically coupled to the engine; a driveline disconnect clutch mechanically including a first side coupled to a second side of the dual mass flywheel; a driveline integrated starter/generator (DISG) including a first side coupled to a second side of the driveline disconnect clutch; a transmission selectively coupled to the engine via the driveline disconnect clutch; and a controller including executable instructions stored in non-transitory memory to idle the engine at a first idle speed while the driveline disconnect clutch is in an open state, and executable instructions to idle the engine at a second idle speed, the second idle speed greater than the first idle speed, while the driveline disconnect clutch is in a closed state, wherein the engine is started and operated to idle without providing engine torque to a driveline in response to a driver demand torque being within a threshold range of an engine cranking torque. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification