CONTROL METHOD AND DEVICE FOR MECHANICAL AUTOMATIC TRANSMISSION SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a smooth and high-quality lock-up clutch control in a mechanical automatic transmission system for vehicle. SOLUTION: In a mechanical automatic transmission system 10 comprising a fuel control engine 12 and mechanical transmission 14 connected and driven by a torque converter and torque converter lock-up clutch assembly 16, high- quality torque converter lock-up is performed smoothly. In order to achieve smooth torque lock-up, an engine torque is lowered smoothly to be a relatively small value and the value is maintained until a torque converter lock-up clutch is connected effectively.