Realtime computer controlled system providing differentiation of incandescent and light emitting diode lamps

A technology for microcontrollers and power systems, applied in the field of impedance measurement, which can solve problems such as service life effects

Inactive Publication Date: 2013-08-07
INT TRUCK INTPROP LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Their service life may be adversely affected by the application of overvoltage

Method used

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  • Realtime computer controlled system providing differentiation of incandescent and light emitting diode lamps
  • Realtime computer controlled system providing differentiation of incandescent and light emitting diode lamps
  • Realtime computer controlled system providing differentiation of incandescent and light emitting diode lamps

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Embodiment Construction

[0011] see figure 1 , shows a highly schematic diagram of the elements of the vehicle electrical control system 10 related to the control of the plurality of lights 12 . Exterior lights are typically monitored for integrity of operation more than interior lights, however, the principles of the system disclosed here can be used in different systems as long as the qualitative operating characteristics of the possible loads are known. The illustrated components of the vehicle electrical control system 10 include a body controller 30, an engine controller 40, and a serial data link 60 on which the body controller 30 and the engine controller 40, as well as other controllers, respectively Data communication is performed using controller area network (CAN) interfaces 44 and 43 . Both the body controller 30 and the engine controller 40 include programmable microprocessors. For the engine controller 40 this is the microcontroller 41 . For the body computer 30 it is the microcontrol...

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Abstract

A motor vehicle electrical power system includes a light source powered from an electrical power source. At key on the light source is tested to determine operational readiness and the type of the light source. At key on the switch is cycled to apply a pulse width modulated energization to the light source. A reference copy of the pulse width modulated signal is available. A comparator having first and second inputs provides a comparison of the pulse width modulated signal applied to the light source and reference. Variation in the rate of change of voltage across the light source may be compared with the reference to characterize the light source as a light emitting diode or another type of source, usually an incandescent bulb.

Description

technical field [0001] The technical field relates generally to impedance measurement, and more particularly, to the application of impedance measurement to identify, from a known set of possible loads, which ones are connected to a power circuit. Background technique [0002] Motor vehicle lighting systems may use different types of light sources, including incandescent bulbs, arc lamps, and light-emitting diodes, among other devices. Low voltage light sources, such as certain types of incandescent bulbs and light emitting diodes, can be powered directly from the body controller, allowing easy electronic switching and bulb monitoring. However, doing so raises the possibility that the characteristics of the loads supported by the body controller will change over the life of a given vehicle, or between vehicles equipped with similarly programmed body controllers. [0003] Incandescent bulbs are powered by connecting the bulb to a voltage source. Their service life may be ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60Q1/14H05B45/50
CPCH05B37/02H05B37/0254B60R25/00H05B45/50H05B47/18H05B47/22H05B47/10H05B47/165
Inventor R·米克斯T·博亚
Owner INT TRUCK INTPROP LLC
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