In comparison with tracked vehicles, wheeled vehicles have such advantages as fast speed, high mobility, long running distance, low price, and convenient maintenance, but with low cross-country power and large turning radius as their weaknesses. Tracked vehicles are mostly military, for example, armored cars and tanks. Wheeled vehicles are the foremost type of civilian vehicle (e.g. cars and trucks). The automatic transmission (AT) is a key component of wheeled vehicles; it automatically changes the gear ratio while running, acting as the AT for the gearshift or pressure adjustment.^1,2 At present, the AT vehicles with automatic shifting function use electronically controlled automatic transmissions (ECAT).² This kind of AT can use different sensors to inform the driving computer of the working condition of engine; the driving computer then sends signals to actuate different solenoids in the hydraulic control system to change the oil duct in the AT to control the gears or adjust the pressure. In the ECAT, the solenoids can control the shift points and clutch locking or regulate the line pressure.^3–5

中文翻译：

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轮式车辆自动变速器电磁测试仪的设计与开发

轮式车辆与履带车辆相比，具有速度快，机动性高，行驶距离长，价格低廉，维修方便等优点，但越野动力低，转弯半径大是其缺点。履带车辆主要是军用车辆，例如装甲车和坦克。轮式车辆是民用车辆（例如汽车和卡车）的首要类型。自动变速箱（AT）是轮式车辆的关键部件。它会在运行时自动更改传动比，用作变速或压力调节的AT。^1,2目前，具有自动变速功能的AT车辆使用电子控制自动变速器（ECAT）。²这种AT可以使用不同的传感器将发动机的工作状态告知驾驶计算机；然后，驱动计算机发送信号以致动液压控制系统中的不同螺线管，以改变AT中的油道以控制齿轮或调节压力。在ECAT中，螺线管可以控制换档点和离合器锁定或调节管路压力。^3–5