Sampled-Variable Control Systems TRIZ Cases

An extremum seeking controller varies cooling tower fan speed to minimize combined chiller and fan power under changing load conditions.

Separating alarm messaging from operational control lets distributed HVAC networks improve diagnostics, installation flexibility, and energy control.

Uses evaporator sensing, compressor speed, and power data to calculate condenser conditions and prevent floodback or overheating.

After simultaneous fridge and freezer operation, refrigerant recovery and 3-way valve control rebalance pressure for faster cooling.

A multi-column touchscreen schedule lets users set HVAC start and end times directly, avoiding scrolling and simplifying temperature programming.

Controller-driven expansion valve control varies evaporator superheat by cargo temperature while keeping compressor pressure within its safe envelope.

A learned steady-state model lets process control switch from extremum seeking to model-based operation, reducing energy loss and equipment wear.

Location-reporting devices let HVAC zones anticipate occupancy and adjust setpoints for personalized comfort with lower energy waste.

Non-obtrusive user queries and sensor learning let an intelligent thermostat cut HVAC energy use without complex programming.

Indoor and outdoor dew point, humidity, and enthalpy are compared to widen economizer use without adding excess indoor moisture.

Temperature and humidity sensing replaces blower door testing to calculate ACH in real time and modulate ventilation dampers with lower energy use.

Valve opening integration time triggers defrost only on the frosted evaporator, reducing unnecessary heater use and temperature rise.

Spatially related menu elements make HVAC thermostat controls easier to navigate while improving access to automatic energy-saving features.

A processing circuit shifts an HVAC actuator between slow and fast modes to cut noise and energy use while speeding calibration and emergency response.

Separate manual and programming screens with season-named presets reduce HVAC mode confusion while keeping control options easy to use.

Dynamic return plenum pressure reset and exhaust damper control stabilize building pressure, cut fan energy use, and avoid air quality issues.

By averaging unbalance wave maxima and minima, the washer adjusts drum speed and balancer action to cut spin-cycle noise and vibration.

Automatic recognition and synced target data let refrigerators and washers manage food and laundry settings with less manual searching and fewer errors.

Reduced-order thermodynamic modeling with an Extended Kalman Filter estimates zone loads and temperatures for faster HVAC and refrigeration diagnostics.

An alphanumeric display and two-position switches replace DIP switches to simplify HVAC setup, save PCB space, and show fault codes clearly.

A rotatable ring and concealed PIR sensing simplify thermostat use while improving HVAC energy control through occupancy-aware settings.

A Zigbee repeater links gas appliances to phones or computers for long-distance control, sensor monitoring, and abnormality alerts.

Balances heat pump and electric heater output from cabin demand and outdoor temperature to maintain heating with lower energy use.

A seven-day programming mode lets one thermostat setup apply across the week, cutting user input from over 100 steps to under 20.

Temperature-driven duct reconfiguration directs airflow to data center hot spots, cutting energy waste without fixed duct rebuilds.

Dynamic monitoring and control adjustment balance fast setpoint response with lower HVAC energy use while maintaining comfort.

Delta T fault alerts are filtered by operating mode, helping HVAC controllers flag real performance issues without nuisance alarms.

Selective local and global parameter sharing cuts HVAC controller setup time and reduces programming errors in zoned systems.

Thermostat on-time and cycle frequency are used to modulate boiler energy input, cutting waste while maintaining comfort.

Adaptive scheduling stages low-priority drinks and allocates shared brewing resources to deliver barista-quality beverages at lower operating cost.

A single power conductor carries thermostat commands and compressor data through voltage modulation, cutting wiring, insulation, and assembly complexity.

Pseudorandom call-home timing spreads thermostat server traffic over time, reducing communication and computation peaks.

Separating dry-bulb and dew-point inputs avoids dry-coil enthalpy errors, enabling more accurate economizer changeover and lower cooling energy waste.

Current sensing compares de-energized and energized relay states to detect connected HVAC components without risky direct voltage checks.

Sensors and movable balance masses continuously correct drum imbalance, cutting spin noise and vibration without bulky suspension assemblies.

A temperature sensor and control circuit keep the toaster cover closed during overheating, containing burning bread until the fire is extinguished.

Temperature differential monitoring detects trapped air in a rear door heat exchanger and triggers corrective action to restore liquid flow and heat transfer.

A segmented touchscreen HVAC controller replaces operating screens with status updates, making scheduling and setup easier for non-technical users.

Audible event notifications let a passive thermostat confirm system status, reducing unnecessary adjustments and improving control efficiency.

A rotatable ring and press-to-navigate menu simplify thermostat settings while supporting occupancy-based energy savings and comfort.

Independently addressable sensors, controllers, and interfaces on a shared HVAC data bus improve installation, maintenance, and climate control.