Title:
CONTROL DEVICE AND CONTROL METHOD FOR VARIABLE VALVE TIMING APPARATUS
Document Type and Number:
Japanese Patent JP2018131985
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To accurately diagnose abnormality in a motor angle sensor which detects a rotation angle of a motor of a variable valve timing apparatus.SOLUTION: A control device detects a rotation phase of a camshaft based on a cam angle signal and a crank angle signal each time the cam angle signal is inputted, detects the amount of change in the rotation phase during the input of the cam angle signal based on a motor angle signal, judges whether at least either the cam angle signal or the crank angle signal is a specified input pattern in diagnosis timing after the input of the cam angle signal and, in a case where it is the specified input pattern, diagnoses the presence/absence of abnormality in a motor angle sensor based on a detection result of the rotation phase and a detection result of the amount of change in the rotation phase in the case where the cam angle signal is inputted before the diagnosis timing.SELECTED DRAWING: Figure 6
Inventors:
MIKAWA KENTARO
MATSUO NOBUHIKO
OKAMOTO NAOKI
MATSUO NOBUHIKO
OKAMOTO NAOKI
Application Number:
JP2017026667A
Publication Date:
August 23, 2018
Filing Date:
February 16, 2017
Export Citation:
Assignee:
HITACHI AUTOMOTIVE SYSTEMS LTD
International Classes:
F02D45/00; F01L1/352; F01L1/356; F02D13/02
Domestic Patent References:
| JP4123127B2 | 2008-07-23 | |||
| JP2008069719A | 2008-03-27 | |||
| JP2015140765A | 2015-08-03 | |||
| JP2006070754A | 2006-03-16 | |||
| JP2016215933A | 2016-12-22 |
Attorney, Agent or Firm:
Moriaki Ogawa
Haruyuki Nishiyama
Mitsuji Sekiya
Haruyuki Nishiyama
Mitsuji Sekiya