Fuel injection system

Claim 1

An engine system including an internal combustion engine having a plurality of combustion spaces, a plurality of fuel injection nozzles mounted on the engine to direct fuel into the combustion spaces respectively of the engine, a plurality of fuel injection pumps for supplying fuel to the injection nozzles respectively, electromagnetic means for actuating the pumps respectively each electromagnetic means including a solenoid and an armature, a starting motor for the engine, a storage battery, a delayed action relay for connecting the starting motor to the storage battery to achieve cranking of the engine, a manually operable switch movable from an off position to a first position and from the first position to a second position, a first contact on said switch which is connected to said battery in the first and second positions of said switch, a second contact on said switch which is connected to said battery in the second position of the switch, said second contact being connected to said delayed action relay whereby the starting motor will be rendered operative when the switch is moved to said second position and after the delay period of the relay, an electronic control unit which controls the supply of current to said solenoids so that the solenoids are energized in timed relationship with the engine, said control unit being connected to said first contact of the switch so that it is energized in the first and second positions of the switch, a first input to said control unit from said second contact, first circuit means in said control unit for energizing said solenoids when said switch is initially moved to said second position, second circuit means in said control unit for ensuring reduced displacement of the fuel injection pumps when said switch is moved to said second position, and third circuit means in said control unit for ensuring multioperation of said injection pumps to achieve the required volume of fuel for starting the engine.