Compensating for water pressure variations in a tempered air system for vehicle passenger compartments
US5085267A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 18, 1990 |
| Grant date | Feb 4, 1992 |
| Priority date | — |
| Expiry date | Jun 18, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60H1/00885
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An automatic control system for regulating the temperature of blower air discharged over a heater core to a vehicle passenger compartment. A thermistor is disposed to sense discharge air adjacent the heater core and provide a temperature signal. An electrical indication is provided of the condition of a servomotor driven valve controlling water flow to the heater core. An electrical reference signal is provided indicative of a user selected relative change of flow discharge air temperature. A signal is provided indicating inlet pressure to the valve controlling flow of liquid to the heater core. The signals are summed; and, the valve servo driven until the sum is zero modulating the valve to maintain the sum at zero for regulating blower air discharge temperature at a constant level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.