Methods and systems for assisted direct start control
First Claim
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1. A method of controlling a vehicle system including an engine that is selectively deactivated during engine idle conditions, comprising:
- adjusting a brake torque applied to a deactivated rotating engine via a clutch after an engine restart request, the brake torque applied to slow the engine to a predetermined threshold speed without stopping the engine; and
engaging a starter to the still rotating engine to increase engine speed and restart the engine.
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Abstract
Method and systems are provided for controlling a vehicle system including an engine that is selectively deactivated during engine idle-stop conditions. One example method comprises, adjusting a brake torque applied to a deactivated rotating engine after an engine restart request, the brake torque applied to slow the engine to at least a predetermined threshold speed without stopping the engine, and engaging a starter to the still rotating engine to increase the engine speed and restart the engine.
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Citations
19 Claims
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1. A method of controlling a vehicle system including an engine that is selectively deactivated during engine idle conditions, comprising:
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adjusting a brake torque applied to a deactivated rotating engine via a clutch after an engine restart request, the brake torque applied to slow the engine to a predetermined threshold speed without stopping the engine; and engaging a starter to the still rotating engine to increase engine speed and restart the engine. - View Dependent Claims (2, 3, 4, 5)
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6. A method of controlling a vehicle system including an engine that is selectively shut-down during engine idle-stop conditions, the method comprising:
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receiving an engine restart request from an operator during an engine idle-stop operation where the engine is not yet stopped; adjusting a brake torque applied to the engine in response to the engine restart request, the brake torque applied to slow the engine to at least a predetermined threshold speed, including increasing the brake torque applied to the engine in response to a first difference between engine speed at a time of restart request and the predetermined threshold speed, and decreasing the brake torque applied to the engine in response to a second difference between engine speed at the time of restart request and the predetermined threshold speed is relatively smaller, the first difference larger than the second difference; and once the at least a predetermined threshold speed is attained, engaging a starter to the still rotating engine to increase engine speed and restart the engine. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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14. A method of expediting engine spin-down in an engine that is shut-down during engine idle-stop conditions and restarted during restart conditions, the method comprising:
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when an engine restart request is received from an operator during an engine idle-stop operation and where the engine is not yet stopped; during a first restart condition, applying a brake torque to the engine, fully stopping the engine, and then engaging a starter to the stopped engine to increase engine speed and restart the engine; during a second restart condition wherein engine speed at an occurrence of a restart request is above a predetermined threshold, applying the brake torque to the engine to slow the engine to at least a predetermined threshold speed, and after the at least a predetermined threshold speed is attained, engaging the starter to the still rotating engine to increase engine speed and restart the engine; and during a third restart condition wherein the engine speed at the occurrence of the restart request is at or below the predetermined threshold, removing the brake torque applied to the engine and engaging the starter to the still rotating engine to increase engine speed and restart the engine. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification