US Patent No: 6,537,033
Number of patents in Portfolio can not be more than 2000
Open loop control apparatus for vacuum controlled systems
Stats
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Mar 25, 2003
Issued date -
Apr 6, 2001
filing date -
09/827,685
serial no -
Expired
status
Importance
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Abstract
An open loop feedback control apparatus for a vacuum controlled system for providing vacuum stability within a predetermined range of vacuum levels is shown. The open loop feedback control apparatus includes a vacuum regulator having a diaphragm including a valve member having a valve opening or input port which changes position as a function of the vacuum level within the vacuum system for controllably admitting or bleeding air into the vacuum system to adjust the vacuum level within the vacuum system. A transducer is operatively coupled to the diaphragm for producing an output signal which represents an instantaneous position of any one of the diaphragm valve member, valve opening or input port. A control device having a pair of inputs and an output has applied to one of the pair of inputs a set point signal representing a programmed vacuum level for the vacuum system and has applied to the other of the pair of inputs the output signal from the transducer representing an instantaneous position of any one of the diaphragm valve member, valve opening or input port. The control device produces on its output a control signal for controlling speed of a variable speed motor which drives a vacuum pump at various speed as required to enable the vacuum pump to maintain the vacuum level of the vacuum system within a predetermined range of vacuum levels.
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First Claim
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
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| 5,141,403 Two-level vacuum system controller with adjustable speed drive | 12 | 1990 | |
| 5,284,180 Controlling vacuum level with a two-level vacuum system controller and adjustable speed drive | 19 | 1992 | |
| 5,960,736 Vacuum level control system using variable frequency drive | 16 | 1997 | |
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| 4,273,154 Device for regulating the vacuum in a vacuum line system, especially for milking installations | 2 | 1980 | |
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| 5,373,822 Hydrocarbon vapor control system for an internal combustion engine | 47 | 1992 | |
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| 4,191,090 Vacuum toggle | 2 | 1978 | |
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| 4,944,249 Vacuum-pressure supply device | 8 | 1988 | |
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| 5,249,932 Apparatus for controlling diaphragm extension in a diaphragm metering pump | 18 | 1991 | |
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| 5,845,599 Vacuum controller and method of controlling vacuum in a dairy milking systems | 5 | 1997 | |
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| 4,966,528 Apparatus for controlling the hydraulic circuit of a piston diaphragm pump | 21 | 1989 | |
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| 5,813,426 Vacuum regulator | 3 | 1996 | |
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| 4,955,408 Vacuum-control valve for milking systems | 5 | 1989 | |
Patent Citation Ranking
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Sep 25, 2014 |
| Fee | Large entity fee | small entity fee | micro entity fee |
|---|---|---|---|
| Surcharge - 11.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
| Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |