Method of determining windshield fogging based on inference from presence of rain
US6155061A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 23, 1999 |
| Grant date | Dec 5, 2000 |
| Priority date | — |
| Expiry date | Dec 23, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60H1/00785
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A method is provided of determining windshield fog secondary for automatically controlling a heating, ventilation and air conditioning (HVAC) system of a vehicle. The method includes the steps of determining whether rain is occurring on a windshield of a vehicle, determining a windshield parameter as a function of the rain occurring and determining a temperature difference based on temperature within a cabin of the vehicle and ambient temperature. The method also includes the steps of determining a fog boundary based on the windshield parameter and temperature difference, determining a relative humidity based on the windshield parameter and the temperature difference and fog boundary and determining a fog probability based on the fog boundary relative humidity and a nominal base relative humidity for rain conditions. The method further includes the steps of determining anti-fog actions to be taken based on the fog probability and taking the anti-fog actions determined to control the HVAC system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.