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AssigneeToyota Jidosha Kabushiki Kaisha
InventorsYuji Iwase, Masami Sugaya, Hiroyuki Nishizawa, Kisaburo Hayakawa, Masataka Osawa
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A hydraulic control apparatus includes two oil flow control valves (30, 32) each provided with a supply control portion (36, 38, 52, 54) for controlling an oil supply from a pressurized oil source, and a discharge control portion (40, 42, 56, 58) for controlling connection with a discharge passage. One of those oil flow control valves supplies/discharges oil to/from one of hydraulic chambers (22, 24) that are oppositely formed in a hydraulic servo mechanism. An operation direction of the hydraulic servo mechanism is performed by operating one of the oil flow control valves. The other operation direction of the hydraulic servo mechanism is performed by operating the other oil flow control valve.
A hydraulic control apparatus of a hydraulic servo unit that selectively changes an operation direction between a first direction when an oil is supplied from a first port and discharged from a second port and a second direction opposite to the first direction when the oil is supplied from the second port and discharged from the first port, the hydraulic control apparatus comprising:
A method of controlling a hydraulic control apparatus of a hydraulic servo unit that selectively changes an operation direction between a first direction when an oil is supplied from a first port and discharged from a second port and a second direction opposite to the first direction when the oil is supplied from the second port and discharged from the first port, the hydraulic control apparatus including a first oil flow control valve and a second oil flow control valve each including an oil supply control portion that controls an oil supply from a pressurized oil source, and an oil discharge control portion that controls a connection to an oil discharge passage, the method comprising:
Dependencies are inferred from the claim text.