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Patent US3911374A successfully refreshed from Google Patents.
US3911374A
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US
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Transducer controlled oscillator system
Assignee: Robert Bosch GmbH
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Filing: 1974-09-09
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Granted: 1975-10-07
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Expires: 1994-09-09
Abstract
Abstract A transducer with variable resistance is connected in the charge-discharge circuit of a capacitor. The voltage at the junction of the capacitor and the transducer of variable resistance is compared with a reference and, depending upon whether the voltage is above, or below the reference, a digital 1-signal, or 0-signal is provided; the change-over rate, or pulse repetition rate of switching between 0 and 1 values is determined by a timing circuit, for example from a pulse supply of fixed clock rate, so that the pulse repetition rate will be representative of resistance of the transducer, and will change with change in the transducer resistance value.
Inventors
- 👤 Wolfgang Busse
- 👤 Mont Hans-Christoph Du
- 👤 Winfried Klotzner
- 👤 Erwin Gloss
- 👤 Rolf Daumer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:17
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/24; F02D41/26; F02D41/28; G; G01; G01K; G01K7/00; G01K7/16; G01K7/22; G01K7/24; G01K7/245; H; H03; H03K; H03K3/00; H03K3/02; H03K3/023; H03K3/0231; H03K7/00; H03K7/08
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
283 words
Transducer controlled oscillator system having an output which changes between discrete values at a repetition rate depending on change in resistance of the transducer (11) in response to changes of a condition characterized by a capacitor (10); a capacitor charge-discharge control stage (18) connected to one terminal of the capacitor, the transducer (11) being connected with one terminal to the other terminal of the capacitor; a threshold sensing circuit (12, 13) connected to sense the charge state of the capacitor and providing an output sensing signal of two discrete values (0, 1) in dependence on the relation of said charge state with reference to a predetermined threshold; means (14, 16) including a clock pulse supply (15) timing the duration during which the output from the threshold sensing circuit (12, 13) is at one of the respective discrete values (0, 1) to form an output of the oscillator system and changing between said values; and means (16'') connecting a signal representative of said output and derived therefrom to the charge-discharge control stage (18) to control said stage to provide charging current to the capacitor when the output signal has one discrete value (1) and to discharge the capacitor when the output signal has the other discrete value (0) so that, depending on the relative value of the resistance of the transducer (11), the threshold level of the threshold sensing circuit (12, 13) will be reached at different instants of time during the charging-discharging cycles of the capacitor and the output signal from the oscillator will change between the discrete values with different change-over rates, thereby providing a signal, the frequency of which varies as said condition, and hence the resistance of the transducer varies.
Claim 2
Dependent Claim
283 words
Transducer controlled oscillator system having an output which changes between discrete values at a repetition rate depending on change in resistance of the transducer (11) in response to changes of a condition characterized by a capacitor (10); a capacitor charge-discharge control stage (18) connected to one terminal of the capacitor, the transducer (11) being connected with one terminal to the other terminal of the capacitor; a threshold sensing circuit (12, 13) connected to sense the charge state of the capacitor and providing an output sensing signal of two discrete values (0, 1) in dependence on the relation of said charge state with reference to a predetermined threshold; means (14, 16) including a clock pulse supply (15) timing the duration during which the output from the threshold sensing circuit (12, 13) is at one of the respective discrete values (0, 1) to form an output of the oscillator system and changing between said values; and means (16'') connecting a signal representative of said output and derived therefrom to the charge-discharge control stage (18) to control said stage to provide charging current to the capacitor when the output signal has one discrete value (1) and to discharge the capacitor when the output signal has the other discrete value (0) so that, depending on the relative value of the resistance of the transducer (11), the threshold level of the threshold sensing circuit (12, 13) will be reached at different instants of time during the charging-discharging cycles of the capacitor and the output signal from the oscillator will change between the discrete values with different change-over rates, thereby providing a signal, the frequency of which varies as said condition, and hence the resistance of the transducer varies.
Claim 3
Dependent Claim
57 words
System according to claim 1, wherein the timing means comprises a counter stage (16) counting the clock pulses derived from the clock pulse source (15) to a predetermined number (N), the counter stage having a digital output changing between discrete values (0, 1) in dependence on whether the counter stage is counting, or has completed its count.
Claim 4
Dependent Claim
58 words
System according to claim 1, wherein the timing means comprises a frequency divider (16) dividing the clock pulses derived from the clock pulse source (15) at a predetermined rate (N), the frequency divider (16) having a digital output changing between discrete values (0, 1) in dependence on whether the counter stage is counting, or has completed its count.
Claim 5
Dependent Claim
27 words
System according to claim 3, wherein the frequency divider (16) is connected between the clock frequency source (15) and the output terminal (17) of the oscillator system.
Claim 6
Dependent Claim
19 words
System according to claim 1, wherein the transducer''s (11) other terminal is connected to ground, or chassis connection (CH).
Claim 7
Dependent Claim
42 words
System according to claim 1, wherein the threshold circuit comprises a reference source (13) and a comparator connected to compare the voltage at the junction (J) of the transducer (11) and the capacitor (10) with the reference voltage of the reference source.
Claim 8
Dependent Claim
31 words
System according to claim 1, wherein the threshold circuit comprises a reference source (13) and a comparator connected to compare the voltage drop across the transducer with respect to the reference.
Claim 9
Dependent Claim
13 words
System according to claim 1, wherein the transducer is an NTC resistor (11).
Claim 10
Dependent Claim
39 words
System according to claim 2, wherein the timing means further comprises an AND-gate (14) having the output of the threshold circuit (13) and the clock pulse source (15) applied thereto and providing its output to the counter stage (16).
Claim 11
Dependent Claim
41 words
System according to claim 3, wherein the timing means further comprises an AND-gate (14) having the output from the threshold circuit (12, 13) and from the clock pulse source (15) applied thereto and providing its output to the frequency divider (16).
Claim 12
Dependent Claim
41 words
In an automotive vehicle, a temperature sensing system having an NTC resistor (11) located in temperature sensing relation to a component of the automotive vehicle, an oscillator system according to claim 2, and wherein the NTC resistor forms the transducer (11).
References Cited (Backward Citations)
US3308667A
Cited
US3656066A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |