Cam Phase Actuator Control Systems and Methods
OwnerMichael Kujak, Todd Wollenberg +2inventors
InventorsMichael Kujak, Todd Wollenberg, Patrick Heithoff, Dean Wardle
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Abstract
The systems and methods described herein provide an approach for cam phase angle control where an axial or rotational position of an actuator of a cam phaser has a direct relationship to the phase angle of the cam shaft, allowing for accurate cam phasing without the need for cam shaft or crank shaft position sensors. Providing phase angle adjustability without the need for crank shaft or cam shaft position sensors enables control of phase angle solely by sensing the axial or rotational position of the actuator of the cam phaser.
Claims20
A cam phasing control system for varying a rotational relationship between a crank shaft and a cam shaft, the cam phasing control system comprising:
- a cam phaser including a first component configured to be coupled to a cam shaft and a second component configured to be coupled to a crank shaft;
- an actuator configured to adjust a rotational position of the first component relative to the second component;
- an actuator position sensor configured to detect an actuation position of the actuator;
- and
- a controller including a processor and a memory, the processor configured to:
- receive a phase angle command;
- determine a required actuation position of the actuator based on the phase angle command and a predetermined relationship between an actuation position of the actuator and cam phase angle;
- and
- command the actuator to displace from a first fixed position to a second fixed position, wherein a magnitude of the displacement between the first fixed position and the second fixed position corresponds with a proportional rotational displacement between the first component and the second component.
A method of open loop control of a cam phasing system for varying a rotational relationship between a crank shaft and a cam shaft, the method comprising:
- receiving a phase angle command;
- determining a required actuation position of a cam phaser actuator based on the phase angle command and a predetermined relationship between actuation positions of the cam phaser actuator and cam phase angles;
- and
- commanding the cam phaser actuator to the required actuation position.
Dependencies are inferred from the claim text.