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US 7,306,543 B2Granted
Automatic transmission controller
AssigneeDenso Corporation
InventorsMasashi Honda, Akira Takagi, Kyohei Takahashi, Fuminori Suzuki
Life of this patent
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AssigneeDenso Corporation
InventorsMasashi Honda, Akira Takagi, Kyohei Takahashi, Fuminori Suzuki
Estimating the term…
An automatic transmission controller has an electronic control circuit, an electromagnetic valve, and a pressure control valve. The electronic control circuit generates a control current. The electromagnetic valve regulates a command pressure in accordance with the control current. The pressure control valve has a spool and is formed with a spool hole. The spool reciprocates in the spool hole in accordance with the command pressure to regulate a pressure supplied to a friction element of an automatic transmission. In a standby state, when the friction element is in a disengaged state, the electronic control circuit generates an oscillating current as the control current so that the electromagnetic valve generates a standby command pressure that makes the spool reciprocate in a range in which no pressure is supplied to the friction element.
An automatic transmission controller that controls an automatic transmission of a vehicle by supplying a pressure of a fluid to a friction element of the automatic transmission to engage the friction element, the automatic transmission controller comprising:
A method of controlling an automatic transmission of a vehicle by supplying a fluid pressure to a friction element of the automatic transmission to engage the friction element, the method comprising the steps of:
Dependencies are inferred from the claim text.