Lock-up clutch control device for vehicle, and lock-up clutch control method
US10612651B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Aug 31, 2016 |
| Grant date | Apr 7, 2020 |
| Priority date | — |
| Expiry date | Dec 24, 2036 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2061/146
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
In a vehicle equipped with a torque converter 4 having a lock-up clutch (3), learning control for obtaining a learning value (L_n) on the basis of meet-point information, with which the lock-up clutch (3) initiates torque transmission, is carried out. When the lock-up clutch (3) experiences a transition to an engaged state during travel, a meet-point learning control unit (12c) calculates an LU transmission torque estimate on the basis of the difference between the engine torque (engine torque signal value Te) and the torque converter transmission torque (τ·Ne2). Excess clutch capacity is detected when the LU transmission torque estimate is greater than an excess capacity determination transmission torque threshold within a prescribed amount of time after an initial pressure (P_n) based on the learning value (L_n) is instructed. When excess clutch capacity is detected, a learning value correction that reduces the learning value (L_n) is carried out.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.