System and method for selecting a camshaft in an engine having dual camshafts
First Claim
1. A method for selecting one of first and second phase shiftable camshafts in a variable camshaft timing engine, said first and second camshafts controlling air flow communicating with said first and second cylinders, respectively, of said engine, said engine further including a crankshaft being driven by first and second pistons within said first and second cylinders, respectively, said method comprising:
- determining which of said first and second camshafts is moving at a faster rate of movement toward a first scheduled phase angle with respect to said crankshaft; and
, selecting one of said first and second camshafts having said faster rate of movement for reducing engine torque fluctuations.
3 Assignments
0 Petitions
Accused Products
Abstract
A system and method for selecting one of first and second camshafts in an engine is provided. The first and second camshafts control air flow communicating with the first and second cylinders, respectively, of the engine. The engine includes a crankshaft being driven by first and second pistons with the first and second cylinders. The method includes determining which of the first and second camshafts is moving at a faster rate of movement toward a first scheduled phase angle with respect to the crankshaft. Finally, the method includes selecting one of the first and second camshafts having the faster rate of movement for reducing engine torque fluctuations.
-
Citations
10 Claims
-
1. A method for selecting one of first and second phase shiftable camshafts in a variable camshaft timing engine, said first and second camshafts controlling air flow communicating with said first and second cylinders, respectively, of said engine, said engine further including a crankshaft being driven by first and second pistons within said first and second cylinders, respectively, said method comprising:
-
determining which of said first and second camshafts is moving at a faster rate of movement toward a first scheduled phase angle with respect to said crankshaft; and
,selecting one of said first and second camshafts having said faster rate of movement for reducing engine torque fluctuations. - View Dependent Claims (2, 3, 4)
-
-
5. A system for selecting one of first and second phase shiftable camshafts in a variable camshaft timing engine, said first and second camshafts controlling air flow communicating with first and second cylinders, respectively, of said engine, said engine further including a crankshaft being driven by first and second pistons within said first and second cylinders, respectively, said system comprising:
-
a first sensor generating a first signal indicative of a position of said first camshaft;
a second sensor generating a second signal indicative of a position of said second camshaft;
a third sensor generating a third signal indicative of a position of said crankshaft; and
,a controller configured to determine which of said first and second camshafts is moving toward a first scheduled phase angle with respect to said crankshaft at a faster rate of movement based on said first, second, and third signals, said controller being further configured to select one of said first and second camshafts having said faster rate of movement for reducing torque fluctuations when changing said faster rate of movement. - View Dependent Claims (6)
-
-
7. An article of manufacture, comprising:
a computer storage medium having a computer program encoded therein for selecting one of first and second phase shiftable camshafts in a variable camshaft timing engine, said first and second camshafts controlling air flow communicating with said first and second cylinders, respectively, of said engine, said engine further including a crankshaft being driven by first and second pistons within said first and second cylinders, respectively, said computer storage medium comprising;
code for determining which of said first and second camshafts is moving at a faster rate of movement toward a first scheduled phase angle with respect to said crankshaft; and
,code for selecting one of said first and second camshafts having said faster rate of movement for reducing torque fluctuations when changing said faster rate of movement. - View Dependent Claims (8, 9, 10)
Specification