| 摘要 |
<p>A vehicle horn and control function switch has compensation for wide temperature variations and preloads from surrounding material due to manufacturing processes and material aging. The switch has a force sensor (140) and a temperature sensor (150) mounted in the hub (22) of a steering wheel (10). The force sensor is connected to the input of an operational amplifier that has an offsetting input network and an amplifying feedback network that are controlled from a programmable microcontroller. The output of the operational amplifier and the temperature sensor are connected to the programmable microcontroller (310). When an actuating force signal is applied to the force sensor, the force signal at an input to the programmable microcontroller exceeds a predetermined threshold and the programmable microcontroller activates an output, causing a horn or other control function to actuate.</p> |
