Patent Number: 6,332,448

Title: Fuel supply apparatus of internal combustion engine

Abstract: In a fuel supply device which supplies fuel in a main tank (8) to a vehicle engine (20), a fractional distiller (9) fractionates the fuel in the main tank (8) into a high octane fuel component and a low octane fuel component, and stores these fuel components in subtanks (10, 11). The high octane fuel component is supplied by a high pressure intermittent pump (16), and the low octane fuel component is supplied by a variable pressure pump (15), to a fuel injector (17) of the engine (20). A controller (1) identifies a running region by the rotation speed and load of the engine (20), determines the proportion of fuel components supplied to the engine (20) according to the identified running region and controls a discharge pressure of the variable pressure pump (15) so that the determined proportion is achieved. When the storage amount of one of the subtanks (10, 11) falls below a minimum value, the proportion of fuel components supplied to the engine (20) from the other subtank (11, 10) is increased.

Inventors: Ilyama; Akihiro (Zushi, JP), Miyakubo; Hiroshi (Yokosuka, JP)

Assignee: Nissan Motor Co., Ltd.

International Classification: F02D 19/08 (20060101); F02D 19/00 (20060101); F02M 1/00 (20060101); F02M 1/16 (20060101); F02M 043/00 (); F02B 007/02 ()

Expiration Date: 12/25/2018