Automated Calibration Station for Ignition Interlock Devices

Abstract

An interlock data collection and calibration system has a device computer, and a gas sample delivery system for delivering a first gas sample and a second gas sample to the ignition interlock device, the first and second gas samples having different predetermined concentrations of alcohol. The device computer includes a calibration program for calibrating the ignition interlock device using the first gas sample, and then delivering the second gas sample to the ignition interlock device to verify that the ignition interlock device correctly determines the second alcohol concentration of the second sample gas.

What is claimed is: 
     
         1 . An interlock calibration system comprising:
 a data port adapted to detachably connect to an ignition interlock device installed on a motor vehicle;   a gas sample delivery system for delivering a gas sample to a fuel cell of the ignition interlock device during a calibration of the ignition interlock device, the gas sample delivery system including a cylinder of compressed alcohol sample gas, a gas control valve coupled to the cylinder of compressed alcohol sample gas, and a microcontroller for regulating the gas control valve; and   a device computer coupled to the data port, the device computer having a computer processor and a computer memory and being separate from and detachably connectable to the ignition interlock device via the data port, wherein the device computer is configured to control the microcontroller to release the gas sample from the cylinder of compressed alcohol sample gas to the fuel cell of the ignition interlock device during calibration of the ignition interlock device.