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-stop conditions, comprising:
- during a first condition, engaging an engine starter, without applying a starter current, to the deactivated rotating engine after the engine speed drops below a threshold speed;
during a second condition, engaging the starter and adjusting a starter motor switch to apply a starter braking torque to the deactivated rotating engine; and
reducing engine reverse rotation via a one-way clutch in the starter.
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Abstract
Methods and systems are provided for controlling a vehicle system including an engine that is selectively deactivated during engine idle-stop conditions. One example method includes, during a first condition, engaging an engine starter, without applying a starter current, to the deactivated rotating engine after the engine speed drops below a threshold speed. The method further includes, during a second condition, engaging the starter and adjusting a starter motor switch to apply a starter braking torque to the rotating engine.
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Citations
18 Claims
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1. A method of controlling a vehicle system including an engine that is selectively deactivated during engine idle-stop conditions, comprising:
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during a first condition, engaging an engine starter, without applying a starter current, to the deactivated rotating engine after the engine speed drops below a threshold speed; during a second condition, engaging the starter and adjusting a starter motor switch to apply a starter braking torque to the deactivated rotating engine; and reducing engine reverse rotation via a one-way clutch in the starter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of controlling a vehicle system including an engine that is selectively deactivated during engine idle-stop conditions, comprising,
engaging an engine starter gear, without applying a starter current, to the deactivated rotating engine after the engine speed drops below a threshold speed; -
with the starter gear engaged, adjusting a starter motor switch to apply a starter braking torque to the rotating engine; and stopping engine reverse rotation via a one-way clutch in the starter. - View Dependent Claims (13, 14, 15, 16)
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17. A vehicle system, comprising:
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an engine having a starter, the starter including a starter motor, a starter gear, a starter motor switch, and a one-way clutch; and a control system configured to, deactivate the engine during engine idle-stop conditions; engage the starter gear, without applying a starter current, to the deactivated rotating engine after the engine drops below a threshold speed; and following starter gear engagement, ground the starter motor switch to apply a braking torque to the still rotating engine. - View Dependent Claims (18)
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Specification