摘要:
To provide a piezoelectric pressure pickup for a fuel injection line, a piezoelectric ceramic plate is mounted between two pressure plates within a pipe clamp which is clamped around the fuel line and has a low coefficient of expansion compared to that of the injection line. One side of the piezoceramic plate is acted upon through one of its pressure plates by a force transmission element and is braced on the other side with a leaf spring which is compressed by means of a pressure screw.
摘要:
A circuit arrangement for evaluating the electrical output signals of a detector for thickness changes in a fuel injection line under the influence of an injection process comprising a series circuit connected to output terminals of the detector and including a differential amplifier, an a-c voltage amplifier, a highpass filter and a rectifier with a peak value storage device and a Schmitt trigger each connected in parallel to the output of the rectifier, the output of the peak value storage device being connected as a reference input of the Schmitt trigger, and a one shot multivibrator connected to the output of the Schmitt trigger.
摘要:
The invention is a circuit for generating a sampling pulse raster which has a pulse repetition frequency proportional to periodic events with variable period, which are to be sampled. The sampling pulses can be taken off at the counting stages of a pulse counter the counting input of which is connected to the output of a voltage-frequency converter. The voltage-frequency converter has two inputs: one for a voltage proportional to the period of the periodic events; another for a voltage proportional to the selected number of sampling pulses per period. The first voltage controls the frequency of the output pulses of the voltage-frequency converter in an inversely proportional sense.
摘要:
A circuit for determining the minimum operating current of magnetic valves, wherein a current source which delivers an impressed current rising in ramp fashion supplies the field coil of the magnetic valve, with a differentiator for the voltage at the field coil connected parallel to the field coil, the output of the differentiator being fed to a control input of an electronic switching unit, the output of the switching unit in control connection with a program generator for the current source in such a manner that a sudden rise of the output voltage of the differentiating member stops the program generator and the program value, which was reached when the current rise was stopped and determines the minimum operating current, is stored in a memory connected to the program generator.
摘要:
Apparatus for the measurement of the synchronization of a combustion engine at suppressed ignition in a crank angle range measuring dead center using means for measuring the duration of the period of the breaker contact pulses for each combustion engine cylinder.
摘要:
A clip-on ammeter includes a magnetic frame, which is designed as a clamp and accommodates a winding and a Hall element in an air gap, a reference current source and a commutating switch for connecting the current source to the winding. Methods of operating include taking measurements with reference current flowing in each of the two possible directions in the winding and secondly with reference current flowing to oppose the effect of the current under measurement and with no reference current flowing. The conversion factor is calculated for use in obtaining readings free of conversion factor drift.
摘要:
A method for determining a measurement value proportional to the compression of an internal combustion engine, derived from the starter current, in which the a-c component of the starter current is integrated over the time between successive current minima and the difference between an integration value averaged over an engine cycle and integration values for individual cylinders obtained between succeeding current minima, is added, with the sign reversed, to the integration value for the next-following cylinder.
摘要:
A testing method for a reciprocating internal combustion engine, in which values of the angular velocity are measured over an angular range of approximately 32.degree. about the top dead center while the engine is running under its own power and at a predetermined speed, and are compared with values of the angular velocity for an entire revolution, and in which the ratio so determined is compared with a similar angular velocity ratio present for an engine of the same engine type at the same speed and with the engine running perfectly.
摘要:
A capacitive pulse pickup is disclosed. The pickup comprises a capacitor electrode which is adapted to be placed against an ignition cable or the like and is directly connected with one end of the primary winding of a pulse transformer, the other end of the primary winding being grounded. The secondary winding of the transformer is, in turn, connected, via a two-conductor cable, to a pulse processing circuit.