Patent Number: 6,332,455

Title: Device for controlling fuel injection

Abstract: A device for controlling fuel injection preventing the wasteful consumption of electric power and expanding the dynamic range for controlling the amount of fuel. The device comprises fuel pressure regulator means (4) for adjusting fuel pressure (Pf) of the fuel to be injected, injector drive means (5) including an electromagnetic coil for opening the valve body of the injector (2), and injection control means (1) for controlling the fuel regulator means and the injector drive means depending upon the operating conditions (Ne, Qa and Pf), wherein, the injection control means includes an injection timer (13) for setting the exciting time for controlling the driving time for opening the valve body by controlling the exciting current and the exciting time for the electromagnetic coil, an over-excitation timer (14) for feeding an over-exciting current, and an over-exciting period control unit (15) for variably setting the initial count value of the over-excitation timer depending upon the fuel pressure, and wherein the over-exciting period is variably set to be a minimum required limit that increases with an increase in the fuel pressure.

Inventors: Sumida; Mamoru (Tokyo, JP), Fukutomi; Norihisa (Tokyo, JP), Matsumoto; Osamu (Tokyo, JP)

Assignee: Mitsubishi Denki Kabushiki Kaisha

International Classification: F02D 41/20 (20060101); F02M 051/00 ()

Expiration Date: 12/25/2018