US 11,742,124 B2
Controller and control method for linear solenoid valve
Takaaki Tokura, Nagoya (JP); Katsumi Kono, Toyota (JP); Takeshi Yasuda, Kuwana (JP); Tomohiro Kondo, Nisshin (JP); Tomoyuki Koike, Nisshin (JP); Masanori Matsubara, Toyota (JP); and Yasuhiro Tanaka, Nisshin (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Dec. 6, 2021, as Appl. No. 17/457,821.
Claims priority of application No. 2020-203226 (JP), filed on Dec. 8, 2020.
Prior Publication US 2022/0181055 A1, Jun. 9, 2022
Int. Cl. F16K 31/06 (2006.01); H01F 7/06 (2006.01); H01F 7/08 (2006.01); H01F 7/16 (2006.01)
CPC H01F 7/064 (2013.01) [F16K 31/0675 (2013.01); H01F 7/081 (2013.01); H01F 7/16 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A controller for a linear solenoid valve, wherein
the controller is configured to execute:
a pulse-width-modulation control that controls an exciting current in the linear solenoid valve supplied with hydraulic oil; and
a dither control that cyclically increases and decreases the exciting current so as to vibrate a spool of the linear solenoid valve,
a vibration cycle of the spool obtained through the dither control,
the dither control includes a first dither control that vibrates the spool in a first dither cycle and a second dither control that vibrates the spool in a second dither cycle that is shorter than the first dither cycle, pulse cycles of a pulse-width-modulation signal generated through the pulse-width-modulation control being pulse-width-modulation cycles, consecutive ones of the pulse-width-modulation cycles corresponding to the second dither cycle, and
the controller is configured to execute the first dither control and the second dither control when an oil temperature of the hydraulic oil is between a first oil temperature and a second oil temperature that is higher than the first oil temperature.