VARIABLE VALVE TIMING FOR CYLINDER DEACTIVATION
First Claim
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1. An engine method, comprising:
- operating a first group of combusting cylinders on a first engine bank to provide a net flow of air and exhaust gas in a first direction while adjusting a valve timing of a second group of non-combusting cylinders on a second engine bank to have substantially less flow in the second bank as compared to the first bank, a direction of the substantially less flow in the second bank adjusted based on an exhaust air-to-fuel ratio of the second bank.
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Abstract
Methods and systems are provided for adjusting cylinder valve timings to enable a group of cylinders to operate and combust while another group of cylinders on a second are selectively deactivated. Valve timing may be adjusted to allow flow of air through the inactive cylinders to be reduced, lowering catalyst regeneration requirements upon reactivation. The valve timing may alternatively be adjusted to enable exhaust gas to be recirculated to the active cylinders via the inactive cylinders, providing cooled EGR benefits.
31 Citations
20 Claims
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1. An engine method, comprising:
operating a first group of combusting cylinders on a first engine bank to provide a net flow of air and exhaust gas in a first direction while adjusting a valve timing of a second group of non-combusting cylinders on a second engine bank to have substantially less flow in the second bank as compared to the first bank, a direction of the substantially less flow in the second bank adjusted based on an exhaust air-to-fuel ratio of the second bank. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An engine method comprising,
operating a first group of combusting cylinders on a first bank with valve timing adjusted to provide a first, higher flow of charge from a first intake manifold to a first exhaust manifold; - and
operating a second group of non-combusting cylinders on a second bank with valve timing adjusted based on an exhaust air-to-fuel ratio at the second bank to provide substantially no flow of charge between a second intake manifold to a second exhaust manifold. - View Dependent Claims (13, 14, 15, 16)
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17. An engine method, comprising:
operating a first group of cylinders on a first engine bank to combust and exhaust a larger amount of gas to a first catalyst and then to an exhaust junction at a first, higher flow rate;
while operating a second group of cylinders on a second engine bank to not combust and alternate flow direction of a smaller amount of charge between a second catalyst and the exhaust junction at a second, lower flow rate.- View Dependent Claims (18, 19, 20)
Specification