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AssigneeRobert Bosch GmbH
InventorsGerald Aydt, Klemens Steinberg, Marco Beier, Markus Rueckle, Oezguer Tuerker
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The invention relates to a method for producing a valve (1) that can be electromagnetically actuated which method comprises an electromagnet (2, 2a, 2b), an armature (3) that can be moved by the electromagnet (2, 2a, 2b), and a valve body (5), having means (4, 4a, 4b, 4c) for converting a movement of the armature (3) into an opening or closing of the valve (1), wherein the electromagnet (2, 2a, 2b) and the armature (3) are inserted into the valve body (5), wherein, before the electromagnet (2, 2a, 2b) is inserted into the valve body (5), a magnetic hysteresis curve (10) of a combination (6) of the electromagnet (2, 2a, 2b) having a test armature (3a) lying against said electromagnet (2, 2a, 2b) is recorded, the slope m1 of a first, substantially linear curve segment (11) of the hysteresis curve (10) is determined in the unsaturated state, and, from the slope m1, the slope m1* of a curve segment (31) of a hysteresis curve (30) of the finally assembled valve (1) having the armature (3) lying continuously against the electromagnet (2, 2a, 2b) is determined, said curve segment corresponding to the first curve segment (11). The invention further relates to a method for determining the armature stroke AH, wherein the magnetic energy ΔE in the air gap (9) formed between the armature (3) and the electromagnet (2, 2a, 2b) is evaluated from the difference between the first slope m0 and the second slope m1*.
A method for ascertaining a hysteresis curve of an electromagnetically actuatable valve (1) made of an electromagnet (2, 2a, 2b), an armature (3) that is movable by way of the electromagnet (2, 2a, 2b), and a valve body (5) with means (4, 4a, 4b, 4c) for converting a movement of the armature (3) into opening or closing of the valve (1), wherein the electromagnet (2, 2a, 2b) and the armature (3) are inserted into the valve body (5), the method comprising recording a magnetic hysteresis curve (10) of a combination (6) of the electromagnet (2, 2a, 2b) with a test armature (3a) contacting said electromagnet (2, 2a, 2b) prior to inserting the electromagnet (2, 2a, 2b) into the valve body (5), ascertaining the slope m1 of a first, substantially linear curve portion (11) of the hysteresis curve (10) in an unsaturated state, and ascertaining, from the slope m1, the slope m1* of a curve portion (31), corresponding to the first curve portion (11), of a hysteresis curve (30) of the fully assembled valve (1) with an armature (3) permanently in contact with the electromagnet (2, 2a, 2b).
A method for determining an armature stroke (AH) on an electromagnetically actuatable valve (1) comprising an electromagnet (2, 2a, 2b) and an armature (3) that is movable by the electromagnet (2, 2a, 2b), the method comprising recording a magnetic hysteresis curve (20) of the valve (1), determining a first slope m0 of a first, substantially linear curve portion (21) of the hysteresis curve (20) of the valve (1) in the unsaturated state, and evaluating the magnetic energy ΔE in the air gap (9) formed between the armature (3) and the electromagnet (2, 2a, 2b) from the difference between the first slope m0 and a second slope m1* of the first, substantially linear curve portion (11), corresponding to the first curve portion (21) of the hysteresis curve (20), of a further magnetic hysteresis curve (10), which the valve (1) would have in the case of an armature (3) secured on the electromagnet (2, 2a, 2b).
Dependencies are inferred from the claim text.