Device and method for detecting abnormality in rotation phase detection device, and rotation position control device using same
AssigneeHitachi Automotive Systems, Ltd.
InventorKentaro Mikawa
Life of this patent
Estimating the term…
Abstract
It is intended to, when abnormality in either one of two rotation detection sections with different detection frequencies occurs, quickly and highly accurately detect the abnormality to favorably deal with abnormality occurring during low engine rotation. It is determined that abnormality is present in the rotation phase detection section, when an absolute value of difference between an actual VTC angle detected by a rotation phase detection section and an integrated value of a VTC change angle detected by motor rotation sensor 201 with the higher detection frequency than the frequency of detection of the actual VTC angle by the rotation phase detection section is equal to or greater than a predetermined value.
Claims15
A device for detecting abnormality in a rotation phase detection device, the rotation phase detection device including a rotation phase detector which detects a rotation phase of a camshaft with respect to a crankshaft every predetermined cycle, based on a rotation angular position of the crankshaft and a rotation angular position of the camshaft rotated by an actuator with respect to the crankshaft;
- and a rotation sensor which detects a relative change angle of the camshaft caused by the actuator with respect to the crankshaft with a higher detection frequency than a detection frequency of the rotation phase detector, the device comprising:
- an electronic control unit in communication with the rotation phase detection device,
- wherein the electronic control unit is configured to determine a presence or an absence of abnormality in one of the rotation phase detector or the rotation sensor, based on a change amount of the rotation phase detected by the rotation phase detector and an integrated value of the relative change angle in the predetermined cycle detected by the rotation sensor, and
- wherein the electronic control unit is configured to adjust a driving control of at least the camshaft in response to determining the presence or the absence of abnormality.
A method for detecting abnormality in a rotation phase detection device, the rotation phase detection device including a rotation phase detector which detects a rotation phase of a camshaft with respect to a crankshaft every predetermined cycle, based on a rotation angular position of the crankshaft and a rotation angular position of the camshaft rotated by an actuator with respect to the crankshaft;
- and a rotation sensor which detects a relative change angle of the camshaft caused by the actuator with respect to the crankshaft with a higher detection frequency than a detection frequency of the rotation phase detector, the method comprising:
- determining, by an electronic control unit in communication with the rotation phase detection device, a presence or an absence of abnormality in one of the rotation phase detector or the rotation sensor, based on a change amount of the rotation phase detected by the rotation phase detector and an integrated value of the relative change angle in the predetermined cycle detected by the rotation sensor, and
- adjusting, by the electronic control unit, a driving control of at least the camshaft in response to determining the presence or the absence of abnormality.
Dependencies are inferred from the claim text.