Engine cooling system and thermostat with improved bypass contro

Details Engine cooling system and thermostat with improved bypass contro Engine cooling system and thermostat with improved bypass contro

1998-05-01

1999-10-19

Kamen, Noah P.

Internal-combustion engines

Cooling

Parallel flow

123 411, 236 92R, 236101C, F01P 300

Patent

active

059671017

ABSTRACT:
This liquid cooling system for internal combustion engines employs a double acting thermostat to prevent coolant temperature fluctuation over a large range of engine loads and speeds and to selectively block coolant flow through the bypass circuit so that the heater and defrost circuit at engine start up and idle will have optimal flow from the coolant pump through the engine for quick heat and defrost purposes. With increased engine speed for vehicle operation, the pump increases coolant flow and pressure, causing the thermostat to open the bypass circuit in parallel with the heater core circuit. This increases flow capacity of the system and eliminate pump cavitation to enhance pump efficiency and system service life. At predetermined higher coolant temperatures, a pellet in the thermostat expands to effect thermostat opening of the high capacity radiator circuit of the system and closing the bypass circuit so that efficiency is further increased and excessive heat energy is effectively dissipated from the coolant.

REFERENCES:
patent: 2500472 (1950-03-01), Sohler
patent: 3353745 (1967-11-01), Beatenbough
patent: 3805748 (1974-04-01), Garcea et al.
patent: 3851629 (1974-12-01), Mayr et al.
patent: 4344564 (1982-08-01), Magnuson
patent: 4456167 (1984-06-01), Buter
patent: 4748941 (1988-06-01), Kashiwase
patent: 4883225 (1989-11-01), Kitchens
patent: 4938185 (1990-07-01), Doke
patent: 5111776 (1992-05-01), Matsushiro et al.
patent: 5174254 (1992-12-01), Humburg

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