Methods and systems for launching a vehicle
First Claim
Patent Images
1. A driveline operating method, comprising:
- providing torque to a driveline via a driveline integrated starter/generator (DISG) in response to a desired torque; and
starting an engine and idling the engine without providing engine torque to the driveline in response to a driver demand torque being within a threshold range of an engine cranking torque, the engine idling with spark timing more advanced than when the engine idles and providing engine torque to the driveline.
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Abstract
Systems and methods for improving operation of a hybrid vehicle are presented. In one example, an engine is started and idled before engine torque is required so that driveline torque response may be improved.
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Citations
19 Claims
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1. A driveline operating method, comprising:
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providing torque to a driveline via a driveline integrated starter/generator (DISG) in response to a desired torque; and starting an engine and idling the engine without providing engine torque to the driveline in response to a driver demand torque being within a threshold range of an engine cranking torque, the engine idling with spark timing more advanced than when the engine idles and providing engine torque to the driveline. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A driveline operating method, comprising:
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providing torque to a driveline via a driveline integrated starter/generator (DISG) in response to a driver demand torque; starting an engine and idling the engine without providing engine torque to the driveline via an open disconnect clutch in response to the driver demand torque being within a threshold range of an engine cranking torque; and accelerating the engine to DISG speed in response to the driver demand torque increasing to a threshold DISG torque, where the engine is idled at a sailing mode idle speed that is lower than when the engine is operated at a base idle speed and provides engine torque to the driveline via the disconnect clutch being closed. - View Dependent Claims (10, 11, 12, 13, 14)
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15. 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 accelerate a vehicle from zero speed via the DISG without starting the engine;
instructions to start the engine in response to a desired torque exceeding a threshold engine cranking torque; and
instructions to increase engine speed to a speed synchronous with DISG speed, slip a torque converter clutch, and close the driveline disconnect clutch. - View Dependent Claims (16, 17, 18, 19)
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Specification