| 摘要 |
A vehicle transmission assembly includes a main gear box and an auxiliary gear box assembly, such as a range gear box. The range gearbox is shifted by an Electric Over Air (EOA) system that includes an air supply, a controller and a single solenoid. The solenoid valve is selectively operated by the controller which includes a timer function. When the driver actuates the range switch, the solenoid valve is energized for a predetermined period of time until the shift has been accomplished. Upon completion of the shift, the controller deenergizes the solenoid valve which then returns to a neutral condition.
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