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, comprising:
- during a selective deactivation from engine idle;
adjusting a brake torque applied to a deactivated still 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.
39 Citations
19 Claims
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1. A method of controlling a vehicle system including an engine, comprising:
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during a selective deactivation from engine idle;
adjusting a brake torque applied to a deactivated still 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; andengaging a starter to the still rotating engine to increase engine speed and restart the engine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for a vehicle system, comprising
selectively deactivating an engine during engine idle conditions; -
adjusting a brake torque applied to a deactivated still rotating engine via a clutch responsive to a change-of-mind engine restart request, the brake torque selected 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 (10, 11, 12, 13)
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14. 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 via a foot pedal 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 a still rotating engine to increase engine speed and restart the engine. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification