| 摘要 |
In some embodiments, systems and methods are provided for controlling transmission downshifting of a vehicle. The systems and methods monitor vehicular conditions continuously throughout vehicle travel such that downshifting may occur during braking along a decline and are not influenced by and do not interfere with road grade calculation systems. In one embodiment, a system comprises sensors that monitor vehicular conditions. The sensors transmit signals indicative of vehicular conditions to an electronic controller that processes the signals. The electronic controller generates instructions for downshifting where the processed signals indicate vehicle travel along a decline and when downshifting would not cause exceeding of a maximum revolutions per minute limit. The instructions are transmitted to a transmission system that downshifts the transmission gear position according to the instructions. The electronic controller cancels the instructions for the downshifting when the degree or duration of accelerator pedal depression exceed predefined values.
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