Fuel injection system for motor vehicles
AssigneeRobert Bosch GmbH
InventorHeinz Popp
Life of this patent
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Abstract
A fuel injection system for internal combustion engines having a high-pressure fuel pump, which supplies fuel from a low pressure chamber via a supply line into at least one high-pressure accumulation chamber. The at least one high-pressure accumulation chamber communicates via high-pressure lines with injection valves, which protrude into the combustion chamber of the engine to be supplied and whose opening and closing movements are each controlled by an electrically triggered control valve disposed in the high-pressure line at the injection valve. In order to prevent an uncontrolled escape of fuel in the event of a breach of a high-pressure line, flow limiting valves are additionally provided in all high-pressure lines, which valves close these lines when an admissible throughput quantity is exceeded.
Claims20
A fuel injection system for internal combustion engines having a high-pressure fuel pump (1), which supplies fuel from a low pressure chamber (7) via a supply line (9) into at least one high-pressure accumulation chamber (11), which communicates via high-pressure lines (21) with injection valves (23), said injection valves protrude into the combustion chamber of the engine to be supplied and opening and closing movements of the injection valves are each controlled by an electrically triggered control valve (25) disposed in the high-pressure line (21) at the injection valve (23), a flow limiting valve (27) is inserted in the supply line (9) which limits a maximal fuel flow quantity into said at least one high-pressure accumulation chamber (11) and into each high-pressure line (21).
A fuel injection system for internal combustion engines having a high-pressure fuel pump (1), which supplies fuel from a low pressure chamber (7) via a supply line (9) into a high-pressure accumulation chamber (11), which communicates with injection valves (23), said injection valves protrude into the combustion chamber of the engine to be supplied and whose opening and closing movements are each controlled by an electrically triggered control valve (25) inserted into the high-pressure line (21) at the injection valve (23), a directly controlled flow limiting valve (27) is inserted into the supply line (9) between the high-pressure fuel pump (1) and the high-pressure accumulation chamber (11), a pressure sensor (15) that is integrated in a housing (62) controls the pressure in the supply line (9) and controls an opening of a pressure limiting valve (13) depending upon the fuel pressure in supply line (9).
Dependencies are inferred from the claim text.