Injector, and device for detecting the condition of such an injector

The combination of an injector (1) for injecting fuel, comprising:

• an injector housing (2),
• a movable nozzle needle which is arranged in the injector housing (2) and has a nozzle needle tip, and
• a nozzle needle seat for receiving the nozzle needle tip and arranged within the injector housing (2), and
• a device (10) configured and arranged for detecting the state of the injector (1), wherein
• a switch (3) is defined within the injector housing (2) by contact pairing of the nozzle needle and the nozzle needle seat,
• on contact of the nozzle needle tip with the nozzle needle seat, said switch (3) assumes a closed state and upon interruption of the contact, said switch (3) assumes an open state,
• the injector (1) is provided with an input line (4) and an output line (5) extending into the injector housing (2) for actuating movement of the nozzle needle,
• the switch (3) formed by said nozzle needle and seat includes a first terminal (6) and a second terminal (7),
• the first terminal (6) of the switch (3) is electrically connected to the input line (4),
• the second terminal (7) of the switch (3) is electrically connected to the injector housing (2),
• a plug on the injector housing (2) has only two poles and only includes the input line (4) and the output line (5), and includes no further lines for detecting opened or closed state of the injector (1),
• the device (1) is configured and positioned to apply a diagnostic voltage and a diagnostic current (Idiag) to the input line (4) leading into the injector housing (2), to detect a voltage profile at the input line (4) and to detect a differential current between the input line (4) and the output line (5).

An injector (1) for injecting fuel, comprising:

• an injector housing (2),
• a movable nozzle needle which is arranged in the injector housing (2) and has a nozzle needle tip, and
• a nozzle needle seat for receiving the nozzle needle tip and arranged within the injector housing (2), wherein
• a switch (3) is defined within the injector housing (2) by contact pairing of the nozzle needle and the nozzle needle seat,
• on contact of the nozzle needle tip with the nozzle needle seat, said switch (3) assumes a closed state and upon interruption of the contact, said switch (3) assumes an open state,
• the injector (1) is provided with an input line (4) and an output line (5) extending into the injector housing (2) for actuating movement of the nozzle needle,
• the switch (3) formed by said nozzle needle and seat includes a first terminal (6) and a second terminal (7),
• the first terminal (6) of the switch (3) is electrically connected to the input line (4),
• the second terminal (7) of the switch (3) is electrically connected to the injector housing (2),
• a plug on the injector housing (2) has only two poles and only includes the input line (4) and the output line (5), and includes no further lines for detecting opened or closed state of the injector (1), and
• between the first terminal (6) of the switch (3) and the input line (4), a resistor (R2) is connected),
• wherein the injector is provided with the input line and the output line for actuating a movement of the nozzle needle,
• the switch includes a first terminal and a second terminal, and
• the injector is configured and positioned to apply a diagnostic voltage and a diagnostic current to the input line leading into the injector housing, to detect a voltage profile at the input line and to detect a differential current between the input line and the output line.

An injector (1) for injecting fuel, comprising:

• an injector housing (2),
• a movable nozzle needle which is arranged in the injector housing (2) and has a nozzle needle tip, and
• a nozzle needle seat for receiving the nozzle needle tip and arranged within the injector housing (2), wherein
• a switch (3) is defined within the injector housing (2) by contact pairing of the nozzle needle and the nozzle needle seat,
• on contact of the nozzle needle tip with the nozzle needle seat, said switch (3) assumes a closed state and upon interruption of the contact, said switch (3) assumes an open state,
• the injector (1) is provided with an input line (4) and an output line (5) extending into the injector housing (2) for actuating movement of the nozzle needle,
• the switch (3) formed by said nozzle needle and seat includes a first terminal (6) and a second terminal (7),
• the first terminal (6) of the switch (3) is electrically connected to the input line (4),
• the second terminal (7) of the switch (3) is electrically connected to the injector housing (2),
• a plug on the injector housing (2) has only two poles and only includes the input line (4) and the output line (5), and includes no further lines for detecting opened or closed state of the injector (1), and
• an actuator (8) is connected to both the input line (4) and the output line (5) and configured to cause the nozzle needle tip to be lifted from the nozzle needle seat upon application of a current guided over the input line (4) and the output line (5)),
• wherein the injector is provided with the input line and the output line for actuating a movement of the nozzle needle,
• the switch includes a first terminal and a second terminal, and
• the injector is configured and positioned to apply a diagnostic voltage and a diagnostic current to the input line leading into the injector housing, to detect a voltage profile at the input line and to detect a differential current between the input line and the output line.