Patent US93918A successfully refreshed from Google Patents.
Patent US3713331A successfully refreshed from Google Patents.
US3713331A
Expired / Lapsed
US
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Apparatus for the determination of internal combustion engine compression pressure
Assignee: Volkswagen AG
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Filing: 1971-02-19
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Granted: 1973-01-30
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Expires: 1991-02-19
Abstract
Abstract The compression pressure of each of the cylinders in an internal combustion engine is represented by a voltage obtained at a tap on the ground cable of the engine and stored in a respective accumulator by control outputs from a shift register which successively activates each of the accumulators to receive the data associated with the starting current of each cylinder. The input to the shift register is fed from the output of a NAND gate having inputs representing the impulses from all the cylinders, the impulses from a cylinder selected as a synchronizing or coordinating cylinder, a main control signal, and a signal from the output of the last accumulator.
Inventors
- 👤 H Petersen
- 👤 H Requardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:50
CPC Classifications
G; G01; G01L; G01L23/00; G01L23/08; G01L23/085
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
134 words
Apparatus for the determination of the compression pressure in the cylinders of an internal combustion engine equipped with a starter and voltage source, said apparatus having means for generating electrical signals representative of the starting current of said engine, and means for generating coordination signals from at least one of said cylinders, the improvement comprising: means for storing said electrical signals, means for gating said electrical signals to said means for storing; said means for gating including means for delaying the gating of said electrical signals; said means for gating including a first input for receiving said electrical signals, and a second input for receiving said coordination signals, whereby said electrical signals are transferred to said means for storing only when said means for gating has received said coordination signals and said electrical signals.
Claim 2
Dependent Claim
134 words
Apparatus for the determination of the compression pressure in the cylinders of an internal combustion engine equipped with a starter and voltage source, said apparatus having means for generating electrical signals representative of the starting current of said engine, and means for generating coordination signals from at least one of said cylinders, the improvement comprising: means for storing said electrical signals, means for gating said electrical signals to said means for storing; said means for gating including means for delaying the gating of said electrical signals; said means for gating including a first input for receiving said electrical signals, and a second input for receiving said coordination signals, whereby said electrical signals are transferred to said means for storing only when said means for gating has received said coordination signals and said electrical signals.
Claim 3
Dependent Claim
134 words
Apparatus for the determination of the compression pressure in the cylinders of an internal combustion engine equipped with a starter and voltage source, said apparatus having means for generating electrical signals representative of the starting current of said engine, and means for generating coordination signals from at least one of said cylinders, the improvement comprising: means for storing said electrical signals, means for gating said electrical signals to said means for storing; said means for gating including means for delaying the gating of said electrical signals; said means for gating including a first input for receiving said electrical signals, and a second input for receiving said coordination signals, whereby said electrical signals are transferred to said means for storing only when said means for gating has received said coordination signals and said electrical signals.
Claim 4
Dependent Claim
134 words
Apparatus for the determination of the compression pressure in the cylinders of an internal combustion engine equipped with a starter and voltage source, said apparatus having means for generating electrical signals representative of the starting current of said engine, and means for generating coordination signals from at least one of said cylinders, the improvement comprising: means for storing said electrical signals, means for gating said electrical signals to said means for storing; said means for gating including means for delaying the gating of said electrical signals; said means for gating including a first input for receiving said electrical signals, and a second input for receiving said coordination signals, whereby said electrical signals are transferred to said means for storing only when said means for gating has received said coordination signals and said electrical signals.
Claim 5
Dependent Claim
32 words
Apparatus as in claim 1 wherein said electrical signals are the voltage drops in the ground line of said voltage source respectively generated by the starting current of each of said cylinders.
Claim 6
Dependent Claim
22 words
Apparatus as in claim 1 wherein said coordination signals are generated from an electrical connection to the first cylinder of said engine.
Claim 7
Dependent Claim
28 words
Apparatus as in claim 1 wherein said coordination signals are generated by an inductive or capacitative pick-up from the ignition cable of at least one of said cylinders.
Claim 8
Dependent Claim
55 words
Apparatus as in claim 1 wherein said means for gating further includes a NAND gate for generating control signals for controlling the transfer of said electrical signals to said means for storing, and said means for delaying is responsive to at least one of said coordination signals to provide an input to said NAND gate.
Claim 9
Dependent Claim
28 words
Apparatus as in claim 5 wherein said means for delaying includes a holding circuit triggered by said coordination signals for providing an input signal to said second input.
Claim 10
Dependent Claim
30 words
Apparatus as in claim 1 Wherein said means for delaying provides a delay substantially equal to a time period required for the stabilization of the compression pressures of said cylinders.
Claim 11
Dependent Claim
104 words
Apparatus as in claim 1 wherein said means for storing includes a storage device for storing the electrical signal for each cylinder of said engine, said electrical signals are fed to said storage devices, each of said storage devices including a control input, said means for gating further including a shift register responsive to said means for gating for generating a control signal for each of said storage devices during one complete starting cycle of said cylinders, whereby an electrical signal representative of the starting current of each of said cylinders is successively fed to a respective one of each of said storage devices.
Claim 12
Dependent Claim
52 words
Apparatus as in claim 8 further comprising an electrical connection between that storage device last controlled in said one complete starting cycle and said means for gating, and the control signal to said last controlled storage device generates therefrom a feedback signal via said electrical connection to block said means for gating.
References Cited (Backward Citations)
US2639859A
Cited
US3421367A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |