| 摘要 |
<p>Radio control model aircraft achieve trim by an offset to the transmitted signal. The offset is generally set by a slider control. Aremote control transmitter, is disclosed having a first input device for providing an input signal to which the transmitter is responsive to provide a control signal to control proportionally an operating parameter of a controlled apparatus. The input device has a neutral state, in which the input signal has a value of zero, corresponding to a desired neutral value of the operating parameter. Operation of a second input device causes the transmitter to provide an offset to the control signal in the same sense as any input to the first input device. The offset increases in value until the first input device is in its neutral state when the operating parameter has the neutral value. In the exemplary application, when the aircraft is flying straight and level, the second input device, which may be a push button, is operated. The pilot continues to fly the aircraft straight and level. In doing so the stick input required reduces until the stick is in the neutral position. The increase in the value of the offset preferably takes place at a rate commensurate with the pilot remaining in control throughout.</p> |
