Methods and systems for operating a vehicle driveline
First Claim
Patent Images
1. A driveline operating method, comprising:
- providing a positive torque to a driveline via a driveline integrated starter/generator (DISG) responding to driver demand torque;
operating an engine at an idle speed in a speed control mode while providing the positive torque to the driveline via the DISG; and
accelerating the engine from the idle speed in the speed control mode to DISG speed in response to a desired torque.
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Abstract
Systems and methods for improving operation of a hybrid vehicle are presented. In one example, an engine is accelerated to a speed of a driveline integrated starter/generator before the engine is coupled to the driveline integrated starter/generator.
48 Citations
20 Claims
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1. A driveline operating method, comprising:
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providing a positive torque to a driveline via a driveline integrated starter/generator (DISG) responding to driver demand torque; operating an engine at an idle speed in a speed control mode while providing the positive torque to the driveline via the DISG; and accelerating the engine from the idle speed in the speed control mode to DISG speed in response to a desired torque. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A driveline operating method, comprising:
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providing positive torque to a driveline via a driveline integrated starter/generator; operating an engine at an idle speed in a speed control mode; adjusting torque converter clutch slip and accelerating the engine in the speed control mode to driveline integrated starter/generator speed in response to a desired torque; and closing a driveline disconnect clutch in response to engine speed substantially matching driveline integrated starter/generator speed. - View Dependent Claims (9, 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 solely provide positive torque to the transmission via the DISG in response to a desired torque being less than an engine cranking torque, and instructions for adjusting engine speed to follow DISG speed when DISG torque is greater than the engine cranking torque and less than a threshold DISG torque. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification