Electricity: single generator systems – Reciprocating and/or oscillating-type generator
Patent
1996-11-22
1999-11-02
Ramirez, Nestor
Electricity: single generator systems
Reciprocating and/or oscillating-type generator
32420716, 32420719, H02K 3500, G01B 714
Patent
active
059777524
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a control signal generator for generating a plurality of control signals by means of a single control lever, comprising respect to the pivot bearing means, each sensor having a respective stem movable in a housing against the action of a spring, the actuating member being arranged to push the end of the stem protruding out of the housing down against the action of the spring, a respective one of the induction coils, a first section of magnetizable material being provided at each stem, this first section being displaced relative to the associated induction coil, when the stem is pushed down, and varying the inductivity of the induction coil, pair of first induction coils relative to the other one and provides first output signals indicative of these variations.
PRIOR ART
EP 0,175,071 describes a control signal generator, wherein a control lever can be deflected in two directions to generate a pair of control signals. A plate is attached to the control lever about the pivot bearing. Approach sensors are mounted in a base part and respond to the movements of the plate. The approach sensors are induction coils, the inductivity of which is varied by the approach of the plate. Diametrically opposite induction coils are series connected across an a.c. voltage. A capacitor in series with a diode is connected across each of the induction coils, the capacitors being charged with opposite polarities by the voltages dropping across the induction coils. The voltages are connected in opposition to provide the control signal.
EP 0,399,484 A1 describes a control signal generator for generating a pair of control signals with a control lever universally pivoted about a pivot point by means of a pivotal bearing. A bell-shaped actuating member is attached to the control lever. Two pairs of diametrically opposite inductive sensors are arranged around the control lever, the pairs, in turn, being angularly offset by 90.degree.. Each of the sensors contains a stem, which is arranged to be displaced in a housing against the action of a spring. When the control lever is deflected from a zero position in the direction towards the sensor, the end of the sensor protruding from the housing is pushed down by the actuating member. An induction coil is arranged in the housing, the stem extending through the induction coil. In order to ensure that, in the zero position of the control lever, the contol signal is safely zero, a cam is provided on the stem, this cam cooperating with a switch such that the control signal of the control signal generator is switched off through the contacts of the switch, when the control lever is in its zero position.
The switches and the mechanical actuating means thereof are subjected to wear. Thereby, the useful life and the reliability of the control signal generator is impaired.
DISCLOSURE OF THE INVENTION
It is the object of the invention to ensure, in a control signal generator mentioned in the beginning with a contactless, purely inductive sensor, the unobjectionable operation of the sensor.
According to the invention, this object is achieved in that arranged in the housing, of the associated sensor, from the first section, the second section being displaced relative to the second induction coil, when the stem is pushed down, and varying, in well defined manner, the inductivity of the second induction coil as a function of displacement, of second induction coils relative to the other one and provides second output signals indicative of these variations, and signals to check the unobjectionable operation of the sensors.
Thus two control signals from two induction coils are generated. Both control signals are unambiguously dependent on the stroke of the stem. By comparing the control signals thus obtained, failures in the system can be recognized by the comparator circuit. There are no mechanically actuated switches. The sensors operate completely contactless.
Preferably, the inductivities of the second induction coil are varied as a function of the stroke t
REFERENCES:
patent: 4654576 (1987-03-01), Oelsch et al.
patent: 4667158 (1987-05-01), Redlich
patent: 4866378 (1989-09-01), Redlich
patent: 5107210 (1992-04-01), Shirao et al.
patent: 5327078 (1994-07-01), Mori
patent: 5331277 (1994-07-01), Burreson
patent: 5394082 (1995-02-01), Schiessle et al.
patent: 5598090 (1997-01-01), Baker et al.
Fernsteuergerate Kurt Oelsch GmbH
Medley Peter
Ramirez Nestor
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