Heat pump motor optimization and sensor fault detection
US5440895A · kind A · utility
156Cited by
12References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 24, 1994 |
| Grant date | Aug 15, 1995 |
| Priority date | — |
| Expiry date | Jan 24, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B30/70
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
The microprocessor-based HVAC control system detects sensor faults by comparing thermistor readings with predetermined extreme values, indicative of sensor fault. The system automatically selects the appropriate combination of automatic/preset modes of operating key system components such as the expansion valve, the demand defrost system and the indoor fan speed control system. With a view towards minimizing any negative impact on system performance and reliability in the event of sensor malfunction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.