Patent ID: 7274887

Claim:
A toner concentration set-up method for a xerographic print engine having a photoreceptor and a toner concentration sensor with a target, the method comprising: setting the target of the toner concentration sensor based on the current environment of the print engine, wherein the environment comprises temperature and relative humidity; using a densitometer to measure the relative reflectance of a 100% area coverage gray patch at a series of development voltage levels; generating a pseudo development curve model in real time; estimating in real-time the development voltage level V dO that starts to develop toner onto the photoreceptor; adding a nominal delta development voltage V dev to V dO to get the development level needed to generate a 100% area coverage gray patch on the photoreceptor; using the densitometer to measure the relative reflectance level of a new 100% area coverage gray patch; moving the target of the toner concentration sensor; and converging the toner concentration sensor's reading to the sensor's target continuously until the relative reflectance level of the new gray patch hits a predefined relative reflectance target within a predefined tolerance range.