Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1986-03-19
1987-07-21
Zazworsky, John
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307290, 307358, 307515, 328 5, H03K 508
Patent
active
046820493
DESCRIPTION:
BRIEF SUMMARY
STATE OF THE ART
The invention is based on a pulse shaper for inductive transmitters, in particular crankshaft angle transmitters on internal combustion engines in accordance with the type of the main claim.
A pulse shaper for inductive transmitters is already known from the publication "Motor-Elektronik", Robert Bosch GmbH, 1983. The inductive transmitter is a crankshaft angle transmitter on an internal combustion engine which emits an alternate voltage. In order to process this alternated voltage in an electronic control device for the internal combustion engine, the alternate voltage is reshaped into rectangular current pulses. A Schmitt-trigger is provided as a pulse shaper for such a purpose. Thereby, the stable hysteresis of the Schmitt-trigger simultaneously increases the nonsensitivity with respect to low interferences. However, erroneous pulses are generated at the output of the Schmitt-trigger during interferences which extend beyond the hysteresis threshold of the Schmitt-trigger.
ADVANTAGES OF THE INVENTION
In contrast thereto, the pulse shaper in accordance with the invention and in accordance with the type of the main claim is advantageous in that at least one trigger threshold of the Schmitt trigger is not fixedly adjusted, but is adjusted by the peak value dectector in dependency on a peak value subsequent to the previously processed signal. Thus, a pulse shaping is provided which is aadaptively dependent on different transmitter amplitudes thus providing an improved safety against interference. If the subsequent processing of the shaped pulse requires a phase correct picking up of the transmitter signal, it is furthermore advantageous to fixedly set a trigger threshold of the Schmitt-trigger, in particular to the zero passage of the transmitter voltage.
DRAWING
One exemplified embodiment of the invention is illustrated in the drawings and is explained in detail in the subsequent description. Thereby, the single FIGURE illustates the electrical circuit diagram of a pulse shaper in accordance with the invention.
DESCRIPTION OF THE EXEMPLIFIED EMBODIMENT
The FIGURE illustrates a circuit diagram of an inductive transmitter with a subsequent series connected pulse shaper being operated by an operating voltage U.sub.B and a reference voltage U.sub.O. For this purpose, the inductivity L of an inductive transmitter, which for purposes of simplification is not illustrated, is connected in series with two resistors R1, R2. Thus, the connecting point of the voltage divider R1, R2 represents the output of the transmitter. When a transmission voltage U.sub.G is induced in inductivity L, the divider voltage at the output of the transmitter is changed accordingly.
Negative peak values of the output voltage of the transmitter are picked up by a peak value detector consisting of a diode D1 and a capacity C. Furthermore, two resistors R4, R3 are connected in series between the capacity C and the output of the transmitter. From the connecting point of the resistors R4, R3 the detected negative peak values are fed to the inverting or minus input of a first differential amplifier V1. The output of the transmitter is connected by means of a resistor R8 with the non-inverting plus input of the second differential amplifier V2.
Each of the differential amplifiers V1, V2 is an operational amplifier having open-collector-output transistor. The outputs of the amplifiers have low resistance when the voltage on the minus input exceeds the inverting or voltage at the non-inverting or plus input and have a high resistance when the voltage on the plus input exceeds the voltage on the minus input.
The plus input of the first differential amplifier V1 is at a fixed potential determined by a voltage divider R5, R6 and R7 which is connected between the operating voltage U.sub.B and the reference voltage U.sub.O. The connection point of a low Ohm resistor R7 and resistor R6 is connected to the output of the first differential amplifier V1 through a feedback resistor R9. Since the resistor R7 has very low Ohms with r
REFERENCES:
patent: 3612912 (1971-10-01), Schwartz
patent: 3801830 (1974-04-01), Boyer
patent: 4258324 (1981-03-01), Henrich
patent: 4311924 (1982-01-01), Breckel et al.
V. A. Scotto et al, "Differential Input Schmitt Trigger" IBM Technical Disclosure Bulletin vol. 16, No. 8 Jan. 1974, p. 2505.
"Motor-Elektronik", Robert Bosch GmbH, 1983.
Kirschner Michael
Rapp Gunter
Zechnall Martin
Robert & Bosch GmbH
Striker Michael J.
Zazworsky John
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