Slip control apparatus for motor vehicle lock-up clutch
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsKatsumi Kono, Shinya Nakamura
Life of this patent
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Abstract
An apparatus including a slip control device for controlling an amount of slip of a lock-up clutch disposed between pump and turbine impellers in a power transmission system of a motor vehicle, a slip-parameter monitoring device for detecting the actual slip speed of the lock-up clutch or a control error between actual and target slip speeds of the lock-up clutch, a summing device for obtaining a sum of values of the actual slip speed or control error detected by the slip-parameter monitoring device for a predetermined period of time, and a defect detecting device for determining the presence or absence of a defect in slip control of the lock-up clutch by the slip control device, on the basis of the sum as compared with a predetermined reference.
Claims8
An apparatus including slip control means for controlling an amount of slip of a lock-up clutch disposed between a pump impeller and a turbine impeller in a power transmission system of a motor vehicle, such that an actual slip speed of said lock-up clutch coincides with a target slip speed, said apparatus comprising:
- slip-parameter monitoring means for detecting a selected slip-related parameter at a predetermined interval while said slip control means is in operation, said slip-related parameter being selected from the group consisting of said actual slip speed of said lock-up clutch and a control error between said actual and target slip speeds of said lock-up clutch;
- summing means for obtaining a sum of values of said selected slip-related parameter detected by said slip-parameter monitoring means;
- and
- defect detecting means for determining the presence or absence of a defect in slip control of said lock-up clutch by said slip control means, on the basis of said sum as compared with a predetermined reference.
Dependencies are inferred from the claim text.