US 11,787,415 B2
Method and system of anti-circumvention monitoring in vehicle ignition interlock operation
David Livingston Smith, Des Moines, IA (US); Carol A. Vokes, Adel, IA (US); Jennifer Johnson, West Des Moines, IA (US); and Brian Clark, Ankeny, IA (US)
Assigned to Consumer Safety Technology, LLC, Des Moines, MN (US)
Filed by Consumer Safety Technology, LLC, Des Moines, IA (US)
Filed on Oct. 4, 2022, as Appl. No. 17/960,010.
Application 17/960,010 is a continuation of application No. 17/217,572, filed on Mar. 30, 2021.
Prior Publication US 2023/0022836 A1, Jan. 26, 2023
Int. Cl. B60W 40/08 (2012.01); G07C 9/00 (2020.01); B60L 58/12 (2019.01)
CPC B60W 40/08 (2013.01) [B60L 58/12 (2019.02); G07C 9/00182 (2013.01); B60W 2040/0836 (2013.01); G07C 2009/00285 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method performed in a processor, the method comprising:
detecting an electrical parameter associated with an electrical power state of a vehicle electrical system in a vehicle comprising an ignition interlock device that includes at least a relay device and a controller device electrically interconnected within the vehicle electrical system;
measuring a rate of degradation associated with the electrical parameter of the vehicle electrical system;
comparing the electrical parameter to a threshold condition;
generating an ignition interlock device violation state based on the electrical parameter being one of above and below the threshold condition; and
after generating the ignition interlock device violation state, comparing the rate of degradation of the electrical parameter to a threshold rate;
reversing the ignition interlock device violation state upon determining that the rate of degradation is below the threshold rate; and
maintaining the ignition interlock device violation state upon determining that the rate of degradation is above the threshold rate.