Vehicle refrigerant heating and cooling system
US4616484A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 1984 |
| Grant date | Oct 14, 1986 |
| Priority date | — |
| Expiry date | Nov 30, 2004 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60H2001/00935
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A refrigerant heating and cooling system for a motor vehicle includes an inside coil, an outside coil, expansion valves, a reversing valve, a refrigerant compressor, a chiller and a control device. The compressor, outside coil, an expansion valve and the inside coil define a first circuit for cooling the air within the vehicle. The compressor, inside coil, an expansion valve and the chiller define a second circuit for heating the interior of the vehicle. The chiller is a refrigerant-to-engine coolant heat exchanger. When in the heating mode, the chiller functions as an evaporator, the inside coil functions as a condenser and the engine coolant system is the heat source. The control device varies the flow of the engine coolant through the chiller as a function of the engine coolant temperature in order to maintain a relatively constant set temperature within the vehicle. In the preferred form, the control device is a microprocessor controlled motor driven valve which senses the engine coolant temperature at the inlet to the chiller, a maximum pressure at the compressor discharge or outlet, the vehicle interior temperature, a set or desired temperature and the outside ambient tempera…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.