Patent US3824966A successfully refreshed from Google Patents.
US3824966A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air-fuel supply mixture control system for internal combustion engines
Assignee: Robert Bosch GmbH
•
Filing: 1972-10-11
•
Granted: 1974-07-23
•
Expires: 1992-10-11
Abstract
Abstract To provide an accurate determination of air flow in the inlet manifold of an internal combustion engine and, more particularly, for a fuel injection system, a guide ring is located in the intake air duct to the engine, spaced from the walls of the engine, and within the guide ring, a temperature sensitive resistor is arranged in the form of a loop, the resistor being heated, the heating current to maintain the temperature sensitive resistor at a predetermined temperature being a measure of air flow independently of turbulence occurring within the inlet tube.
Inventors
- 👤 R Schneider
- 👤 H Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:00
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/18; F02D41/187; G; G01; G01F; G01F1/00; G01F1/68; G01F1/684; G01F1/696; G01F1/698
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
152 words
In an air-fuel measuring supply control system for an internal combustion engine having means for measuring the amount of air being introduced to the engine, said means having an air inlet tube (30) thrOugh which air is guided to the engine; a temperature responsive resistor (35) located in the air stream passing through said tube (30); means (49, 50) supplying electrical heating current to said resistor (35); and means (46, 47) deriving an electrical signal representative of change of current flowing through the resistor as a function of change of air flow in the inlet tube to the engine; the improvement comprising a tubular air guide and support ring (31) located in the interior of, and spaced from the walls of the air inlet tube (30) to the engine, the temperature responsive resistor (35) being a resistance wire arranged in the form of a loop and located within the guide ring (31).
Claim 2
Dependent Claim
152 words
In an air-fuel measuring supply control system for an internal combustion engine having means for measuring the amount of air being introduced to the engine, said means having an air inlet tube (30) thrOugh which air is guided to the engine; a temperature responsive resistor (35) located in the air stream passing through said tube (30); means (49, 50) supplying electrical heating current to said resistor (35); and means (46, 47) deriving an electrical signal representative of change of current flowing through the resistor as a function of change of air flow in the inlet tube to the engine; the improvement comprising a tubular air guide and support ring (31) located in the interior of, and spaced from the walls of the air inlet tube (30) to the engine, the temperature responsive resistor (35) being a resistance wire arranged in the form of a loop and located within the guide ring (31).
Claim 3
Dependent Claim
61 words
A system according to claim 1 in combination with a fuel injection system having a control unit (17) controlling the amount of fuel being injected to the engine, wherein the electrical signal is applied to said control unit to provide a control parameter to regulate the amount of fuel being injected and to provide a stoichiometric air-fuel mixture to the engine.
Claim 4
Dependent Claim
33 words
A system according to claim 1 wherein a plurality of spacer attachments (36, 37, 38) are provided circumferentially securing the wire within the ring (31), the wire (35) being stretched between the spacers.
Claim 5
Dependent Claim
19 words
A system according to claim 1 wherein the guide ring forms part of the inlet tube to the engine.
Claim 6
Dependent Claim
30 words
A system according to claim 1 further comprising a temperature sensing means (40) located in the stream of inlet air and sensing the temperature of air passing through said ring.
Claim 7
Dependent Claim
32 words
A system according to claim 5 wherein said air temperature sensing means comprises a temperature sensitive resistor (40) located in the stream of air upstream of the loop temperature responsive resistor (35).
Claim 8
Dependent Claim
89 words
A system according to claim 5 wherein the temperature sensing means (40) comprises an electrical resistor means changing resistance with change in air temperature, said temperature responsive resistor (35) and said resistor means being connected in a bridge circuit, said bridge circuit including further resistors which are temperature independent (43, 44, 45), said bridge circuit including said temperature dependent resistors (35, 40) and said temperature independent resistors (43, 44, 45), and said ring forming a unitary structural assembly located in the stream of inlet air passing to the engine.
Claim 9
Dependent Claim
35 words
A system according to claim 2 wherein a plurality of attachment means (36, 37, 38) are provided circumferentially securing the wire (35) to the ring (31) and stretching the wire in loop-arrangement within the ring.
Claim 10
Dependent Claim
31 words
A system according to claim 2 further comprising a temperature sensing means (40) located in the stream of inlet air and sensing the ambient temperature of air passing through said ring.
Claim 11
Dependent Claim
96 words
A system according to claim 9 wherein the temperature sensing means comprises an electrical resistor (40) said electrical resistor and said temperature responsive resistor (35) forming one resistance, each, of the branches of a bridge circuit; two essentially temperature independent resistance means (43, 44, 45), one each being connected to said resistor (40) and said temperature sensitive resistor (35) and completing the arms of the bridge, one of said resistors being adjustable, said resistors of said bridge circuit, and said ring forming a single structural unit located in the inlet tube to the internal combustion engine.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |