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A fuel injection system for an internal combustion engine and a method of controlling fuel injection according to which a predetermined fuel quantity is delivered from a high-pressure pump to the internal combustion engine, first and second return flow quantity are returned through first and second

A fuel injection system for an internal combustion engine and a method of controlling fuel injection according to which a predetermined fuel quantity is delivered from a high-pressure pump to the internal combustion engine, first and second return flow quantity are returned through first and second relief ducts, the second relief duct including a control throttle having a constant cross-section, and an electronic control unit controls flow delivery in accordance with characteristic values including those of the internal combustion engine, the pump, and a quantity measuring device for measuring the second return flow, and in accordance with the predetermined fuel delivery quantity also used as a characteristic value.

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A fuel injection system for an internal combustion engine, said fuel injection system comprising: a high-pressure pump including pump work space and means for delivering a constant fuel quantity per a pump cycle from said pump work space; a first relief duct for returning a first return flow quantit

A fuel injection system for an internal combustion engine, said fuel injection system comprising: a high-pressure pump including pump work space and means for delivering a constant fuel quantity per a pump cycle from said pump work space; a first relief duct for returning a first return flow quantity; first open/close control means for controlling the first flow quantity flowing through said first relief duct to thereby determine a start and an end of the delivery; a second relief duct for returning a second return flow quantity and including a control throttle; and electronic control means for controlling the fuel delivery in accordance with characteristic values of the internal combustion engine and said high-pressure delivery pump; said control throttle having a constant cross-section, said fuel injection system further comprising quantity measuring means located in said second relief duct for measuring the second return flow quantity and a second open/close control means for controlling the second return flow quantity, said electronic control means comprising means for controlling the flow delivery in accordance with characteristic values of said quantity measuring means and said second open/close control means and in accordance with the constant fuel delivery quantity also used as a characteristic value.