| 摘要 |
PCT No. PCT/AT86/00014 Sec. 371 Date Nov. 17, 1986 Sec. 102(e) Date Nov. 17, 1986 PCT Filed Feb. 19, 1986 PCT Pub. No. WO86/05235 PCT Pub. Date Sep. 12, 1986.A circuit arrangement to detect signals indicating a change in the current of a needle lift sensor of an injection nozzle in combustion engines, which is connected to a constant direct current supply. This circuit arrangement, which is intended to detect the signals indicating a change in current that are emitted by a needle lift sensor Zs of an injection nozzle in combustion engines that is connected to a direct current source, is designed in such a way that it will also detect minor signals indicating a change in current under the conditions prevailing in motor vehicles, which exhibit a high level of interference. For this purpose, the sensor (Zs) is connected to the controlled outlet (4) of a controlled direct current source (1) and a sensing resistor (RM) is connected between the outlet (3) of the regulating amplifier (2) and the outlet of the direct current source (1); the outlet (3) of the regulating amplifier (2) is connected to the input of an AC amplifier (5) with band-pass characteristics, and the outlet of the AC amplifier (5) is connected to the input of a Schmitt trigger (7), the output signal (UA) of which represents the changes in the sensor current (Is). |
