Feed Forward Control for Electric Variable Valve Operation
First Claim
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1. A method for controlling an electric motor for positioning a valve adjustment mechanism to vary cylinder valve operation comprising:
- adjusting a torque output of the electric motor to counteract an anticipated periodic torque disturbance applied to the valve adjustment mechanism from a valvetrain source to position the valve adjustment mechanism at a desired position.
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Abstract
Periodic torque disturbances that affect cylinder valve operation are anticipated, and an appropriate reaction torque is provided by an electric motor to counteract the periodic torque disturbances to position a cylinder valve at a desired position.
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Citations
20 Claims
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1. A method for controlling an electric motor for positioning a valve adjustment mechanism to vary cylinder valve operation comprising:
adjusting a torque output of the electric motor to counteract an anticipated periodic torque disturbance applied to the valve adjustment mechanism from a valvetrain source to position the valve adjustment mechanism at a desired position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An engine system comprising:
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a valve adjustment mechanism to vary operation of an intake or exhaust valve; an electric motor operable to adjust a position of the valve adjustment mechanism; and a controller for adjusting a torque output of the electric motor to counteract an anticipated periodic torque disturbance applied to the valve adjustment mechanism from a valvetrain source to position the valve adjustment mechanism at a desired position. - View Dependent Claims (14, 15, 16, 17)
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18. A variable camshaft timing system comprising:
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a camshaft rotatable to actuate an intake or exhaust valve; an electric motor operable to adjust an angular position of the camshaft; and a controller for adjusting a torque output of the electric motor based on an anticipated periodic torque disturbance from a camshaft source, at an appropriate time, prior to the anticipated periodic torque disturbance causing a camshaft angular position error, to counteract the anticipated periodic torque disturbance. - View Dependent Claims (19, 20)
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Specification