Tamper detection system
AssigneeBendix Commercial Vehicle Systems LLC
InventorsPratima Vishwakarma, Tandi Wijaya, Daniel P Zula
Life of this patent
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Abstract
A tamper detection system for a controller includes a housing, a circuit board mounted in the housing, a voltage input line on the circuit board receiving an operating voltage, a light detection circuit mounted on the circuit board receiving the operating voltage from the voltage input line and a signal conditioning device conditioning the operating voltage and connected to the light detection circuit. The light detection circuit interrupts the operating voltage at the signal conditioning device in response to detecting a source of light having a light value greater than a threshold.
Claims12
A tamper detection system for a controller comprising:
- a housing;
- a circuit board installed in the housing;
- a voltage input line on the circuit board receiving an operating voltage;
- a light detection circuit provided on the circuit board receiving the operating voltage from the voltage input line;
- a signal conditioning device conditioning the operating voltage and connected to the light detection circuit,
- wherein the light detection circuit interrupts the operating voltage at the signal conditioning device in response to detecting a source of light having a light value greater than a threshold.
A method for disabling a controller in response to unauthorized access comprising:
- receiving an operating voltage;
- powering a light detection circuit and a signal conditioning device of the controller with the operating voltage;
- and
- comparing a light value to a threshold in the light detection circuit, wherein the light detection circuit inhibits the operating voltage from reaching the signal conditioning device in response to the light value being greater than the threshold, thereby disabling the controller.
Dependencies are inferred from the claim text.