Video output diagnostics for automotive application
AssigneeMagna Electronics Inc.
InventorsNazar F. Bally, Patrick Miller
Life of this patent
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Abstract
A vehicle vision system includes a diagnostic circuit for a video output cable that senses the current flowing into a video output driver. The diagnostic circuit is operable to process the current flow to determine an open-circuit condition of the video cable, a short to ground condition of the video cable and/or a short to battery condition of the video cable. The circuit may process the current flow passing through an electrical resistor connected in series between the video output driver and the video driver power supply.
Claims20
A system for determining a diagnostic condition of a video connection with a display module in a vehicle, the system comprising:
- video processing circuitry providing a video signal;
- a video driver receiving the video signal and amplifying it for transmission over a video cable, wherein the video driver is powered by a video driver power supply;
- a current sensor in connection with the video driver power supply;
- a microcontroller operatively connected to the current sensor to determine the current sensed by the current sensor;
- wherein the microcontroller receives a short to battery input;
- and
- wherein the microcontroller is operable to determine a diagnostic condition of the video cable based at least in part on (a) the determination of current sensed by the current sensor and (b) the short to battery input.
A method for determining a diagnostic condition of a video connection with a display module in a vehicle, the method comprising:
- providing a video signal;
- amplifying the video signal via a video driver for transmission over a video cable, the video driver being powered by a video driver power supply;
- sensing the current flowing into the video driver through the video driver power supply;
- determining the output voltage of the video driver;
- and
- determining a diagnostic condition of the video cable based at least in part on at least two of (a) the sensed current flowing into the video driver, (b) the output voltage of the video driver and (c) a short to battery condition.
A system for determining a diagnostic condition of a video connection with a display module in a vehicle, the system comprising:
- video processing circuitry providing a video signal;
- a video driver receiving the video signal and amplifying it for transmission over a video cable, wherein the video driver is powered by a video driver power supply;
- a video display operable to display video images responsive to the video signal, wherein the video display is disposed in a cabin of a vehicle equipped with the system and is viewable by a driver of the equipped vehicle when the driver is normally operating the equipped vehicle;
- a current sensor in connection with the video driver power supply;
- a microcontroller operatively connected to the current sensor to determine the current sensed by the current sensor;
- wherein the microcontroller receives a short to battery input;
- wherein the microcontroller is operable to determine a diagnostic condition of the video cable based at least in part on (a) the determination of current sensed by the current sensor and (b) the short to battery input;
- and
- wherein the microcontroller determines at least one of (i) an open circuit condition when the current sensed by the current sensor falls below a predetermined quantity, (ii) a short to battery condition when the current sensed by the current sensor exceeds a predetermined quantity and the short to battery input is triggered, and (iii) a short to ground condition when the current sensed by the current sensor exceeds a predetermined quantity and the short to battery input is not triggered.
Dependencies are inferred from the claim text.