US3851469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature supervisory system for exhaust gas reactors for internal combustion engines
Assignee: Robert Bosch GmbH
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Filing: 1972-08-23
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Granted: 1974-12-03
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Expires: 1992-08-23
Abstract
Abstract A temperature sensor is located in thermal sensing relationship to a component of the engine system, for example, a catalytic or thermal reactor in the exhaust system to reduce noxious components of the exhaust gases, the sensor providing an electrical output signal representative of temperature. A threshold switch, having at least one switching threshold, is responsive to the electrical output signal when a temperature threshold has been exceeded, to provide an alarm signal or bypass exhaust gases past the reactor to prevent damage to the reactor due to excessive temperatures. The threshold switch preferably includes operational amplifiers.
Inventors
- 👤 D Eichler
- 👤 W Remmele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:32
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/18; F01N3/20; F01N3/2053; F01N9/00; F02; F02D; F02D41/00; F02D41/02; F02D41/14; F02D41/1438; F02D41/1444; F02D41/1446; F01N2390/00; F01N2390/02; F01N2410/00; F01N2410/02; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
233 words
Temperature monitoring and protective supervisory system for the exhaust system of internal combustion engine systems including at least one reactor (19) in the exhaust system thereof to prevent damage to the reactor due to excessive temperatures comprising a temperature sensing means (21) located in thermal sensing relationship to an element of the engine system and providing an electrical signal representative of temperature in the exhaust system of the engine and thus a measure of the operating condition of the reactor (19); a threshold switch means (10) having a plurality of switching positions, each having a corresponding output, and each corresponding to a discrete temperature level as sensed by the temperature sensing means (21), to provide a plurality of theshold signals, each corresponding to a discrete temperature threshold level in excess of a predetermined temperature arising within the exhaust system of the engine; and control means (11, 12, 13, 16) including an indicator means, and means connected to the engine system commanding operation of the engine system tending to reduce the operating temperatures arising within the exhaust system thereof, said control means being energized by said threshold switch means (10) when one of the threshold levels thereof is exceeded, the switch output of the respective threshold levels being connected to selectively activate said indicating means and said engine operating command means to permit corrective action to be taken before the reactor is being damaged.
Claim 2
Dependent Claim
233 words
Temperature monitoring and protective supervisory system for the exhaust system of internal combustion engine systems including at least one reactor (19) in the exhaust system thereof to prevent damage to the reactor due to excessive temperatures comprising a temperature sensing means (21) located in thermal sensing relationship to an element of the engine system and providing an electrical signal representative of temperature in the exhaust system of the engine and thus a measure of the operating condition of the reactor (19); a threshold switch means (10) having a plurality of switching positions, each having a corresponding output, and each corresponding to a discrete temperature level as sensed by the temperature sensing means (21), to provide a plurality of theshold signals, each corresponding to a discrete temperature threshold level in excess of a predetermined temperature arising within the exhaust system of the engine; and control means (11, 12, 13, 16) including an indicator means, and means connected to the engine system commanding operation of the engine system tending to reduce the operating temperatures arising within the exhaust system thereof, said control means being energized by said threshold switch means (10) when one of the threshold levels thereof is exceeded, the switch output of the respective threshold levels being connected to selectively activate said indicating means and said engine operating command means to permit corrective action to be taken before the reactor is being damaged.
Claim 3
Dependent Claim
25 words
System according to claim 1, wherein the temperature sensing means is located to be responsive to temperatures arising in the exhaust system of the engine.
Claim 4
Dependent Claim
26 words
System according to claim 1, wherein the temperature sensing means is responsive to temperatures arising within the reactor (19) in the exhaust system of the engine.
Claim 5
Dependent Claim
20 words
System according to claim 1, wherein the indicator means comprises at least one of optical and audible indicators (11, 12).
Claim 6
Dependent Claim
51 words
System according to claim 1, wherein the engine operating command means comprises a bypass (20) connected to shunt exhaust gases past the reactor (19), and means (16) controlling gas flow selectively through the bypass or over the reactor, said selectively controllable means being controlled by operation of the threshold switch (10).
Claim 7
Dependent Claim
30 words
System according to claim 5, wherein the selectively operable means comprises a diverter flap valve (16) selectively directing the exhaust gases through the reactor (19) or through the bypass (20).
Claim 8
Dependent Claim
45 words
System according to claim 1, wherein the engine operating command means comprises valve means (13) connected in the fuel supply line to the internal combustion engine and controlling fuel supply to the engine in dependence on the threshold level to which the switch (10) responds.
Claim 9
Dependent Claim
43 words
System according to claim 1, wherein the threshold switch means comprises a plurality of operational amplifiers (22, 31, 32), each connected as trigger circuits, and each having a separate threshold level corresponding to different temperature levels of the element in the exhaust system.
Claim 10
Dependent Claim
28 words
System according to claim 1, further comprising an additional operational amplifier (33) connected as an amplifier between said temperature sensing means (21) and said threshold switch means (22).
Claim 11
Dependent Claim
25 words
System according to claim 9, further comprising an impedance matching element (35) connected between said temperature sensing means (21) and said further operational amplifier (33).
Claim 12
Dependent Claim
37 words
System according to claim 1, wherein said threshold switch includes active electronic elements (22, 33); and voltage stabilization means (46) are interconnected between said active elements and the source of supply (+; -) and said active elements.
Claim 13
Dependent Claim
15 words
System according to claim 1, wherein said temperature sensing means is a temperature responsive resistor.
Claim 14
Dependent Claim
15 words
SysTem according to claim 1, wherein the temperature sensing means comprises a thermo couple element.
Claim 15
Dependent Claim
30 words
System according to claim 1, wherein the reactor is a catalytic reactor and the temperature sensing means comprises a thermo couple located in heat transfer relation to the catalytic reactor.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |