DIAGNOSTIC METHOD FOR POPPET VALVES AND MEASURING DEVICE FOR CARRYING OUT SAID METHOD
First Claim
1. A diagnostic method for poppet valves with which an actuating force (F1) representing an action force that is generated by a drive (2) of the poppet valve (100) is determined for at least one closing element (8*) of the poppet valve (100) in the form of a force-time curve, the actuating force (F1) is either determined directly or from a reaction force (F2) resulting from the actuating force (F1) in the poppet valve (100), wherein the actuating force (F1) or the reaction force (F2) is determined by measuring the expanding deformations caused therefrom, and the measured, current force-time curve of the actuating force (F1(t)) or of the reaction force (F2(t)) is saved and subjected to an evaluation,characterized in thatthe current force-time curve measured during the operation or life of the poppet valve (100) of the actuating force or of the reaction force (F1(t);
- F2(t)) of a switching cycle is compared with a saved, earlier one,deviations are determined from the comparison,deviations within a predetermined tolerance range for these deviations are accepted,and that when these deviations exceed the predetermined tolerance range, a message and/or control signal is/are generated.
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Accused Products
Abstract
The invention relates to diagnostic methods according to the preamble of the equivalent claims 1 and 2, with which the state of a poppet valve in the course of the switching cycles and/or events thereof, such as the occurrence of pressure shocks or surges during continuous operation is/are monitored continuously, the measured signals are stored and the stored measured signals are interpreted in a targeted manner and early indication of cases of damage is carried out. According to a preferred variant of the diagnostic method, said aim is achieved in that at the same time as the force-time curve of the actuating force or the reaction force (F1(t); F2(t)), a displacement-time curve (h(t)) of the displacement (h) of the at least one closing element (8*) is measured, in that the force-time curve of the actuating force or of the reaction force (F1(t); F2(t)) and the displacement-time curve (h(t)) are combined with each other and used to determine a force-displacement curve of the actuating force or the reaction force (F1(h); F2(h)), in that the current force-displacement curve of the actuating force (F1(h)) or the reaction force (F2(h)) of a switching cycle, in each case determined over the operating period or lifetime of the poppet valve (100), is compared with an earlier, stored curve, in that deviations are determined from the comparison, in that, within a predefined tolerance range for said deviations, the latter are accepted, and in that, when said deviations exceed the predefined tolerance range, a message and/or a control signal is/are generated.
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Citations
20 Claims
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1. A diagnostic method for poppet valves with which an actuating force (F1) representing an action force that is generated by a drive (2) of the poppet valve (100) is determined for at least one closing element (8*) of the poppet valve (100) in the form of a force-time curve, the actuating force (F1) is either determined directly or from a reaction force (F2) resulting from the actuating force (F1) in the poppet valve (100), wherein the actuating force (F1) or the reaction force (F2) is determined by measuring the expanding deformations caused therefrom, and the measured, current force-time curve of the actuating force (F1(t)) or of the reaction force (F2(t)) is saved and subjected to an evaluation,
characterized in that the current force-time curve measured during the operation or life of the poppet valve (100) of the actuating force or of the reaction force (F1(t); - F2(t)) of a switching cycle is compared with a saved, earlier one,
deviations are determined from the comparison, deviations within a predetermined tolerance range for these deviations are accepted, and that when these deviations exceed the predetermined tolerance range, a message and/or control signal is/are generated. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
- F2(t)) of a switching cycle is compared with a saved, earlier one,
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2. A diagnostic method for poppet valves with which an actuating force (F1) representing an action force that is generated by a drive (2) of the poppet valve (100) is measured for at least one closing element (8*) of the poppet valve (100) in the form of a force-time curve, the actuating force (F1) is either measured directly or from the reaction force (F2) resulting from the actuating force (F1) in the poppet valve (100), wherein the actuating force (F1) or the reaction force (F2) is determined by measuring the expanding deformations caused therefrom, and the measured, current force-time curve of the actuating force (F1(t)) or of the reaction force (F2(t)) is saved and subjected to an evaluation,
characterized in that a displacement-time curve (h(t)) of the displacement (h) of the at least one closing element (8*) is measured at the same time as the force-time curve of the actuating force or of the reaction force (F1(t); - F2(t)), and the force-time curve of the actuating force and reaction force (F1(t);
F2(t)) and the displacement-time curve (h(t)) are combined with each other, and a force-displacement curve of the actuating force or of the reaction force (F1(h);
F2(h)) is calculated therefrom,the current force-time curve determined during the operation or life of the poppet valve (100) of the actuating force (F1(t)) or of the reaction force (F2(t)) of a switching cycle is compared with a saved, earlier one, deviations are determined from the comparison, deviations within a predetermined tolerance range for these deviations are accepted, and that when these deviations exceed the predetermined tolerance range, a message and/or a control signal is/are generated. - View Dependent Claims (3, 4, 5)
- F2(t)), and the force-time curve of the actuating force and reaction force (F1(t);
Specification