Patent US4428227A successfully refreshed from Google Patents.
US4428227A
Expired / Lapsed
US
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Intake pipe pressure indicating system for an internal combustion engine of a vehicle
Assignee: Honda Motor Co Ltd
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Filing: 1982-05-19
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Granted: 1984-01-31
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Expires: 2002-05-19
Abstract
Abstract An intake pipe pressure indicating system for an internal combustion engine of a vehicle having an intake pipe including a supercharger and a throttle valve. The system comprises sensors which detect the internal pressure of the intake pipe at an upstream position and at a downstream position, respectively, with respect to the throttle valve and provides corresponding output signals. A comparator provides a logic signal based on the result of a comparison between the output signal from either of the sensors and a reference value. A selection circuit is provided which is adapted to select and to transmit and output either of the output signals on the basis of the logic signal, and a single indicator is provided which is adapted to provide an indication corresponding to the output signal of the selection circuit. The respective intake pipe pressures at the upstream position and at the downstream position with respect to the throttle valve can be selectively indicated by a single indicator in a continuous manner so that the indicator is used effectively.
Inventors
- 👤 Tetsuo Yamagata
- 👤 Morio Sato
- 👤 Tetsuo Ogishima
- 👤 Yoji Matsuyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:01
CPC Classifications
G; G01; G01L; G01L23/00; G01L23/24; G01L19/00; G01L19/08; G01L19/083
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
178 words
In an internal combustion engine of a vehicle including an intake pipe provided with a supercharger and a throttle valve disposed downstream of said supercharger, an intake pipe pressure indicating system, comprising: a first sensor which detects an internal pressure of said intake pipe downstream of said supercharger and upstream of said throttle valve and provides a first signal according thereto; a second sensor which detects an internal pressure of said intake pipe downstream of said throttle valve and provides a second signal according thereto; a comparator operatively connected with said first and second sensors and providing a logic signal on the basis of a comparison between at least either of said first and second signals and a predetermined reference value; a selection circuit operatively connected with said comparator and selecting either said first or said second signal on the basis of said logic signal and providing an indication signal according thereto; and a single indicator operatively connected with said selection circuit and adapted to receive said indication signal and effect an indication according to said indication signal.
Claim 2
Dependent Claim
178 words
In an internal combustion engine of a vehicle including an intake pipe provided with a supercharger and a throttle valve disposed downstream of said supercharger, an intake pipe pressure indicating system, comprising: a first sensor which detects an internal pressure of said intake pipe downstream of said supercharger and upstream of said throttle valve and provides a first signal according thereto; a second sensor which detects an internal pressure of said intake pipe downstream of said throttle valve and provides a second signal according thereto; a comparator operatively connected with said first and second sensors and providing a logic signal on the basis of a comparison between at least either of said first and second signals and a predetermined reference value; a selection circuit operatively connected with said comparator and selecting either said first or said second signal on the basis of said logic signal and providing an indication signal according thereto; and a single indicator operatively connected with said selection circuit and adapted to receive said indication signal and effect an indication according to said indication signal.
Claim 3
Dependent Claim
122 words
An intake pipe pressure indicating system according to claim 1, wherein: said selection circuit comprises: an output circuit which provides said indication signal; a first transmission circuit which transmits said first signal to said output circuit; a first switching circuit which is connected to said first transmission circuit at one end thereof and is substantially grounded at the other end thereof; a second transmission circuit which transmits said second signal to said output circuit; a second switching circuit which is connected to said second transmission circuit at one end thereof and is substantially grounded at the other end thereof; and said first and second switching circuits being adapted to be switched on and switched off on the basis of said logic signal.
Claim 4
Dependent Claim
24 words
An intake pipe pressure indicating system according to claim 2, wherein: said first and second switching circuits comprise first and second emitter-grounded transistors, respectively.
Claim 5
Dependent Claim
58 words
An intake pipe pressure indicating system according to claim 3, wherein: the collector of said first transistor is connected to said first transmission circuit; the collector of said second transistor is connected to both said second transmission circuit and the base of said first transistor; and said logic signal is applied to the base of said second transistor.
Claim 6
Dependent Claim
17 words
An intake pipe pressure indicating system according to claim 1, wherein: said comparator comprises an operation amplifier.
Claim 7
Dependent Claim
45 words
An intake pipe pressure indicating system according to claim 5, wherein: said operation amplifier includes a positive input terminal having said first signal applied thereto, a negative terminal having said reference value applied thereto, and an output terminal through which said logic signal is provided.
Claim 8
Dependent Claim
44 words
An intake pipe pressure indicating system according to claim 6, wherein: said reference value is substantially the same as a value of said first signal when said internal pressure of said intake pipe upstream of said throttle valve is equal to the atmospheric pressure.
Claim 9
Dependent Claim
40 words
An intake pipe pressure indicating system according to claim 1, wherein: said indicator comprises an amplifier which amplifies said indication signal and provides an output, and a voltmeter adapted to make an indication according to said output of said amplifier.
Claim 10
Dependent Claim
33 words
An intake pipe pressure indicating system according to claim 1, wherein: said indicator provides a visual display which is variable in a band-expansion manner in accordance with the variation of said indication signal.
Claim 11
Dependent Claim
28 words
An intake pipe pressure indicating system according to claim 9, wherein: said visual display is provided in the form of a plurality of bars arranged side-by-side substantially horizontally.
Claim 12
Dependent Claim
22 words
An intake pipe pressure indicating system according to claim 9, wherein: said indicator is disposed adjacent to a tachometer of said vehicle.
Claim 13
Dependent Claim
38 words
An intake pipe pressure indicating system according to claim 1, wherein: said vehicle comprises a motorcycle provided with a turbo-supercharger comprising an exhaust gas turbine disposed within an exhaust pipe of said internal combustion engine and said supercharger.
Claim 14
Dependent Claim
33 words
An intake pipe pressure indicating system according to claim 1, wherein: said indication as based on said first signal and said indication as based on said second signal are continuous with each other.
References Cited (Backward Citations)
US4046003A
Cited
US4334427A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-30 | 1987-08-01 | 1988-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-30 | 1991-08-01 | 1992-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-30 | 1995-08-01 | 1996-01-31 | $7700.00 | Window Closed / Lapsed |