| 摘要 |
In-line diesel fuel heater (26) for use with diesel fuel engines in starting and operating in cold weather by heating the diesel fuel above its cloud point to enable the fuel to pass through the fuel filter (38). The in-line fuel heater (26) has an electric heating element (22, 105) attached to a hollow elongated housing (12) having a block of reticulated polyurethane foam (fibers) (14) and/or fins located in the interior of housing. The reticulated polyurethane foam (14) may surround and support a non-porous acrylic foam block (16) and in combination, these elements increase turbulence to increase the surface area which comes in contact with the diesel fuel. The analog control circuit (109) uses a positive temperature coefficient (PTC) thermistor (110) to control MOS power transistors (108) and to regulate the temperature of the housing (12) at a constant temperature instead of controlling the power based on on measurement of temperature of the diesel fuel itself at some point in its path through the fuel heater. |
