Systems and methods for backlash compensation in cam phasing systems
AssigneeHUSCO Automotive Holdings LLC
InventorsMichael Kujak, Todd Wollenberg, Patrick Heithoff
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Abstract
The present disclosure provides systems and methods to compensate for backlash within a cam phasing system. For example, compensating for backlash by commanding a predetermined amount of additional actuator movement to account for backlash within a cam phaser. According to some aspects, a spring is provided within a cam phaser to unidirectionally take up the backlash within the cam phasing system.
Claims15
A method of controlling a cam phasing system for varying a rotational relationship between a crankshaft and a camshaft, the cam phasing system including a cam phaser having a sprocket hub driven by a crankshaft, a cradle rotor coupled to a camshaft, a spider rotor arranged between the cradle rotor and the sprocket hub, and an actuator configured to adjust a phase angle of the cradle rotor relative to the sprocket hub, the method comprising:
- receiving a phase angle command to actuate the cam phaser from a first phaser position to a second phaser position, the first phaser position and the second phaser position corresponding to a first phase angle and a second phase angle, respectively;
- determining a required actuator position of the actuator corresponding to the second phaser position;
- commanding the actuator from a current actuator position to the required actuator position plus a predetermined amount of actuator overshoot, wherein the predetermined amount of actuator overshoot is configured to compensate for backlash within the cam phasing system.
A method of controlling a cam phasing system for varying a rotational relationship between a crankshaft and a camshaft, the cam phasing system including a cam phaser having a sprocket hub driven by a crankshaft, a cradle rotor coupled to a camshaft, a spider rotor arranged between the cradle rotor and the sprocket hub, and an actuator configured to adjust a phase angle of the cradle rotor relative to the sprocket hub, the method comprising:
- actuating the actuator from a first position to a second position in response to a command from a controller;
- and,
- rotating a follower member from a first rotational position to a second rotational position in response to movement of the actuator, wherein a magnitude of actuation of the actuator corresponds to a magnitude of rotation of the follower member,
- wherein the follower member is biased in the first rotational direction relative to the cradle rotor, and
- wherein rotating the follower member in the first rotational direction includes rotating the follower member a first rotational distance between the first rotational position and the second rotational position, and a second rotational distance corresponding to an amount of backlash in the cam phasing system.
Dependencies are inferred from the claim text.