| 摘要 |
A backlash sound reducing method utilizes backlash sounds in a planetary gear unit in a hybrid vehicle that occur within predetermined operation ranges when the vehicle is stopped or running. If the output energy of an engine is within a predetermined range, the engine is controlled so that the output energy therefrom becomes a predetermined value. In the aforementioned case, it is also possible to increase the revolution speeds of the gears undergoing backlash. This operation avoids operating the engine within a range where the torque fluctuation is large, thereby reducing the backlash sound. Further, by setting relatively high revolution speeds, the force pressing the gears to each other is increased, so that the occurrence of backlash sounds is controlled.
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