Inkjet Fluid Ejection System Pressure Sensor Supply Condition Detection

The patent replaces mechanical float-based fluid level sensors with a pressure sensor unit that measures backpressure in the fluid supply chamber. This substitution enables more accurate detection of fluid supply conditions including pre-exhaustion states, while maintaining relatively simple system integration. The pressure sensor converts fluid pressure directly into electrical signals for processing.

The patent introduces a determination module as an intermediary component that processes pressure sensor signals and translates them into meaningful supply condition assessments. This module acts as a mediator between the physical pressure measurement and the control system decisions, enabling accurate detection of pre-exhaustion conditions without requiring complex direct measurement mechanisms.

The patent segments the supply condition assessment into multiple discrete voltage value ranges, each corresponding to different fluid supply states (normal operation, pre-exhaustion, exhaustion). The determination module evaluates which voltage range the current reading falls into, enabling precise condition identification. This segmentation approach transforms continuous pressure data into actionable discrete states without requiring overly complex processing.

The patent utilizes changes in voltage output from the pressure sensor unit as fluid pressure changes to detect different supply conditions. By monitoring voltage value ranges and their correspondence to pressure states, the system accurately determines supply conditions including pre-exhaustion. This parameter-based approach enables precise detection while keeping the processing logic relatively simple through range comparison.