Stop-start control systems for engines with fully flexible valve actuation system
First Claim
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1. A vehicle system comprising:
- a stop-start command module configured to detect an autostop request and generate a mode signal based on the autostop request;
a cylinder control module configured to sequentially disable cylinders of an engine during an autostop mode based on the mode signal, wherein the cylinders of the engine include respective intake valves and exhaust valves, andwherein the cylinder control module is configured to maintain the intake valves in a closed state and the exhaust valves in an open state during the autostop mode and during a plurality of cycles of a crankshaft of the engine;
a timer module configured to (i) measure an amount of time that a speed of the engine is equal to 0 during the autostop mode, and (ii) based on the measured amount of time, determine whether the speed of the engine is equal to 0 for a predetermined period during the autostop mode,wherein the timer module is configured to store a first position of the crankshaft in response to the speed of the engine being equal to 0 for at least the predetermined period; and
a crankshaft module configured to determine a second position based on the first position during an autostart mode.
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Abstract
A vehicle system includes a stop-start command module and a cylinder control module. The stop-start command module is configured to detect an autostop request and generate a mode signal based on the autostop request. The cylinder control module is configured to sequentially disable cylinders of an engine during an autostop mode based on the mode signal. The cylinders of the engine include respective intake valves and exhaust valves. The cylinder control module is configured to maintain the intake valves in a closed state and the exhaust valves in an open state during the autostop mode and during multiple cycles of a crankshaft of the engine.
41 Citations
18 Claims
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1. A vehicle system comprising:
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a stop-start command module configured to detect an autostop request and generate a mode signal based on the autostop request; a cylinder control module configured to sequentially disable cylinders of an engine during an autostop mode based on the mode signal, wherein the cylinders of the engine include respective intake valves and exhaust valves, and wherein the cylinder control module is configured to maintain the intake valves in a closed state and the exhaust valves in an open state during the autostop mode and during a plurality of cycles of a crankshaft of the engine; a timer module configured to (i) measure an amount of time that a speed of the engine is equal to 0 during the autostop mode, and (ii) based on the measured amount of time, determine whether the speed of the engine is equal to 0 for a predetermined period during the autostop mode, wherein the timer module is configured to store a first position of the crankshaft in response to the speed of the engine being equal to 0 for at least the predetermined period; and a crankshaft module configured to determine a second position based on the first position during an autostart mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 15, 16)
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9. A method comprising:
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detecting an autostop request and generating a mode signal based on the autostop request; sequentially disabling cylinders of an engine during an autostop mode based on the mode signal, wherein the cylinders of the engine include respective intake valves and exhaust valves; maintaining the intake valves in a closed state and the exhaust valves in an open state during the autostop mode and during a plurality of cycles of a crankshaft of the engine; measuring an amount of time that a speed of the engine is equal to 0 during the autostop mode; based on the measured amount of time, determining whether the speed of the engine is equal to 0 for a predetermined period during the autostop mode; storing a first position of the crankshaft in response to the speed of the engine being equal to 0 for at least the predetermined period; and determining a second position based on the first position during an autostart mode. - View Dependent Claims (10, 11, 12, 13, 14, 17, 18)
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Specification