Title:
CONTROL DEVICE FOR VARIABLE VALVE TIMING MECHANISM AND CONTROL METHOD THEREOF
Document Type and Number:
WIPO Patent Application WO/2020/100939
Kind Code:
A1
Abstract:
Provided are a control device for a variable valve timing mechanism and a control method thereof, wherein cam phase angle interpolation can be performed with high accuracy without using a motor rotation angle sensor. The control device for a variable valve timing mechanism comprises a controller which detects the phase angle of a cam on the basis of a cam signal and controls the phase angle of the cam using an electric motor. The controller is configured to calculate, by a motor torque estimation unit, a motor torque from a motor current on the basis of the motor characteristics, calculates, by a motor rotation angle estimation unit, a motor rotation angle on the basis of at least the motor torque and the engine operating state, and performs interpolation, by a conversion unit and a feedback control unit, on the cam phase angle of the variable valve timing mechanism from the motor rotation angle.
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Inventors:
KOSUDA MASAKI (JP)
SHIMIZU HIROKAZU (JP)
MATSUO NOBUHIKO (JP)
SHIMIZU HIROKAZU (JP)
MATSUO NOBUHIKO (JP)
Application Number:
PCT/JP2019/044516
Publication Date:
May 22, 2020
Filing Date:
November 13, 2019
Export Citation:
Assignee:
HITACHI AUTOMOTIVE SYSTEMS LTD (JP)
International Classes:
F02D13/02; F01L1/344; F02D41/02; F02D41/04; F02D41/10; F02D45/00
Foreign References:
| JP2018145874A | 2018-09-20 | |||
| JP2008051111A | 2008-03-06 | |||
| JP2015218623A | 2015-12-07 | |||
| JP2013083187A | 2013-05-09 |
Other References:
See also references of EP 3882451A4
Attorney, Agent or Firm:
OGAWA, Moriaki et al. (JP)
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