Methods and systems for assisted direct start control
First Claim
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1. A vehicle system, comprising:
- a powertrain including wheels, an engine having a starter, a torque converter having a lock-up clutch, and an automatic transmission including a forward clutch;
an alternator including an alternator clutch;
an air conditioner including a compressor clutch;
a cylinder deactivation mechanism for deactivating at least a cylinder valve of a cylinder; and
a control system configured to deactivate the engine during engine idle-stop conditions and selectively restart the engine in response to an operator engine restart request, the restart request received during an idle-stop operation where the engine is not yet stopped, wherein selectively restarting the engine includes,adjusting a brake torque applied to the engine to slow the engine to at least a predetermined threshold speed, and once the predetermined threshold speed is attained, engaging the starter to the still rotating engine to increase engine speed and restart the engine when engine speed at a time of the restart request is above the predetermined threshold speed; and
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 when the engine speed at the time of the restart request is at or below the predetermined threshold speed.
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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
9 Claims
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1. A vehicle system, comprising:
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a powertrain including wheels, an engine having a starter, a torque converter having a lock-up clutch, and an automatic transmission including a forward clutch; an alternator including an alternator clutch; an air conditioner including a compressor clutch; a cylinder deactivation mechanism for deactivating at least a cylinder valve of a cylinder; and a control system configured to deactivate the engine during engine idle-stop conditions and selectively restart the engine in response to an operator engine restart request, the restart request received during an idle-stop operation where the engine is not yet stopped, wherein selectively restarting the engine includes, adjusting a brake torque applied to the engine to slow the engine to at least a predetermined threshold speed, and once the predetermined threshold speed is attained, engaging the starter to the still rotating engine to increase engine speed and restart the engine when engine speed at a time of the restart request is above the predetermined threshold speed; and 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 when the engine speed at the time of the restart request is at or below the predetermined threshold speed. - View Dependent Claims (2, 3, 4, 6, 8)
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5. A vehicle system, comprising
an engine that is selectively deactivated during engine idle conditions; - and
a controller with memory including instructions to;
adjust a brake torque applied to a deactivated rotating engine via a clutch after an engine restart request, the brake torque selected to slow the engine to a predetermined threshold speed without stopping the engine; and
engage a starter to the still rotating engine to increase engine speed and restart the engine. - View Dependent Claims (7, 9)
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Specification