LED light bar for optical traffic control systems
First Claim
1. A light bar comprising:
- a support structure;
a plurality of LED modules individually mounted on the support structure, each LED module including a plurality of LED groups, wherein in at least one of the plurality of LED modules, at least one LED group in the module is an infrared (IR) LED group, and at least one LED group in the module is a visible light LED group; and
a controller coupled to each module, wherein the controller is configured to trigger an IR light pulse pattern at a first level of IR radiant power from the at least one IR LED group, and the pulse pattern and first level of IR radiant power activate preemption in a traffic control preemption system, the controller further configured to trigger the at least one visible LED group to emit a flash pattern.
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Accused Products
Abstract
Various approaches for activating a traffic control preemption system. A light bar includes a support structure and a plurality of LED modules individually mounted on the support structure. Each LED module includes a plurality of LED groups, and in at least one of the plurality of LED modules, at least one LED group in the module is an infrared (IR) LED group, and at least one LED group in the module is a visible light LED group. A controller is coupled to each module. The controller is configured to trigger an IR light pulse pattern at a first level of IR radiant power from the at least one IR LED group. The pulse pattern and first level of IR radiant power activate preemption in a traffic control preemption system.
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Citations
21 Claims
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1. A light bar comprising:
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a support structure; a plurality of LED modules individually mounted on the support structure, each LED module including a plurality of LED groups, wherein in at least one of the plurality of LED modules, at least one LED group in the module is an infrared (IR) LED group, and at least one LED group in the module is a visible light LED group; and a controller coupled to each module, wherein the controller is configured to trigger an IR light pulse pattern at a first level of IR radiant power from the at least one IR LED group, and the pulse pattern and first level of IR radiant power activate preemption in a traffic control preemption system, the controller further configured to trigger the at least one visible LED group to emit a flash pattern. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A light bar comprising:
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a support structure; a plurality of LED modules mounted on the support structure, each LED module including a plurality of LED groups, and in two or more of the plurality of LED modules, at least one LED group is an infrared (IR) LED group and at least one LED group is a visible light LED group; a plurality of capacitors coupled to the LED groups, respectively; a plurality of controlled current sources coupled to the IR LED groups, respectively; at least one trigger switch coupled to the controlled current sources; and a microcontroller coupled to the at least one trigger switch, wherein the microcontroller is configurable with a parameter for specifying different levels of IR radiant power and is configured to trigger an IR light pulse pattern from the IR LED groups and maintain a first level of IR radiant power from the IR LED groups using individual control of respective current levels to the IR LED groups in response to current sense levels from the IR LED groups, wherein the pulse pattern and first level of IR radiant power activate preemption in the traffic control preemption system, the microcontroller further configured to trigger the at least one visible LED group to emit a flash pattern. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A light bar for a traffic control preemption system, comprising:
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a plurality of LED modules, each LED module including a plurality of LED groups, wherein in two or more of the LED modules, at least one LED group in the module is an infrared (IR) LED group, and at least one LED group in the module is a visible light LED group; means for supporting the plurality of LED modules on a vehicle; means for providing power to the LED groups; means for controlling current to the plurality of LED groups; programmable means for triggering an IR light pulse pattern at a first level of IR radiant power from the IR LED groups and for maintaining a first level of IR radiant power from the IR LED groups using individual control of respective current levels to the IR LED groups in response to current sense levels from the IR LED groups, wherein the pulse pattern and first level of IR radiant power activate preemption in the traffic control preemption system; and means for triggering the at least one visible LED group to emit a flash pattern.
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Specification