| 摘要 |
A power Off upshift control method for an automatic transmission includes the steps of determining, during an upshift operation, if power Off upshifting is taking place; determining if power Off upshift conditions are satisfied; measuring a hydraulic pressure response time, establishing a maximum duty value for preventing forced shifting, and calculating the hydraulic pressure response time when the maximum duty value changes to 100% duty, these processes being performed if the power Off upshift conditions are satisfied; calculating a shift finish point after the hydraulic pressure response time is calculated; determining if the shift finish point corresponds to an actual shift finish point; and setting the maximum duty value at 100% duty if the shift finish point corresponds to the actual shift finish point. |
