Patent ID: 8290670
Filing Date: 2012-10-16
Classification: F16H,Y10T

Abstract:
1. A clutch control device, comprising: a plurality of hydraulic clutches built into a transmission that transmits an output of an engine via a torque converter; a speed change pattern determination device that determines a speed change pattern that represents a speed change of the transmission including an upshift pattern and a downshift pattern; a clutch switching pattern storage device in which a plurality of clutch switching patterns, each defining engage/release changeover timing with which the plurality of hydraulic clutches are engaged/released are stored in correspondence to individual speed change patterns adopted by the transmission; a clutch switching pattern selection device that selects a clutch switching pattern stored in the clutch switching pattern storage device in correspondence to a speed change pattern for the transmission determined by the speed change pattern determination device at a time of speed change; a hydraulic control device that executes hydraulic control for the plurality of hydraulic clutches in correspondence to the clutch switching pattern selected by the clutch switching pattern selection device; an engine rotation rate detection device that detects an engine rotation rate at the engine; and a speed ratio detection device that detects a speed ratio of the torque converter; wherein the transmission executes a speed change by shifting a first clutch among the plurality of hydraulic clutches from a connected state to a disconnected state and shifting a second clutch among the plurality of hydraulic clutches from a disconnected state to a connected state; a plurality of types of clutch switching patterns are set in correspondence to each of the speed change patterns as combination control information indicating a specific combination of a pressure-decreasing hydraulic control parameter for releasing the first clutch and a pressure-increasing hydraulic control parameter for engaging the second clutch based on the engine rotation rate and the speed ratio; an engine rotation rate range is divided into a plurality of levels according to a value of the engine rotation rate and a speed ratio range is divided into a plurality of levels according to a value of the speed ratio, and for each speed change pattern, the plurality of types of combination control information are prepared in correspondence to combinations each indicating a specific level of the engine rotation rate among the plurality of engine rotation rate levels and a specific level of the speed ratio among the plurality of speed ratio levels; the clutch switching pattern selection device selects one clutch switching pattern corresponding to a level of the engine rotation rate detected by the engine rotation rate detection device and a level of the speed ratio detected by the speed ratio detection device, based upon the speed change pattern determined by the speed change pattern determination device at the time of the speed change; and the hydraulic control device executes hydraulic control for the first clutch and the second clutch according to the combination control information indicating a specific combination of a pressure-decreasing hydraulic control parameter and a pressure-increasing hydraulic control parameter in correspondence to the clutch switching pattern selected by the clutch switching pattern selection device at the time of the speed change.