US Patent 7944347 Apparatus for accelerating sensor reading upon start-up

Apparatus for monitoring one or more motor vehicle tire conditions includes a receiver for intercepting signals from sensors mounted on the tires, a processor for identifying, converting, evaluating and storing said sensor signals, a keypad for selecting sensor data, an alarm for indicating an undesirable tire condition, and a display for providing sensor data. An unswitched circuit is connected to the vehicle battery and to the receiver and the processor in the monitoring apparatus. A switched circuit is connected via an ignition switch to the battery and to the monitoring apparatus as a whole. Sensor information obtained by the processor while the ignition switch is off is available to the user as soon as the ignition switch is turned on.