US4241709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for adjusting the ignition time in internal combustion engines
Assignee: Dr Ing HCF Porsche AG
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Filing: 1979-04-23
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Granted: 1980-12-30
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Expires: 1999-04-23
Abstract
Abstract A device for the adjustment of the ignition time of an internal combustion engine as a function of the vacuum in the intake line which is provided with a flow regulator in the form of a throttle valve or the like.
Inventors
- 👤 Klaus Schellmann
- 👤 Heinz Schulze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:22
CPC Classifications
F; F02; F02P; F02P5/00; F02P5/04; F02P5/05; F02P5/14; F02P5/142
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
135 words
Device for adjusting the ignition timing of an internal combustion engine comprising: (a) a vacuum adjusting device having a distributor retard chamber and a distributor advance chamber for controlling ignition timing, said distributor advance chamber being in communication with intake vacuum in an air intake line; (b) a vacuum chamber; (c) a thermoswitch actuatable in response to the temperature of engine intake air exceeding a predetermined value; (d) a throttle valve switch actuatable in response to a flow regulator means in said air intake line assuming a full or high load range position; and (e) control valve means for communicating said distributor retard chamber with ambient pressure in a first position thereof and for communicating said distributor retard chamber with said vacuum chamber upon conjoint actuation of both of said thermoswitch and throttle valve switch.
Claim 2
Dependent Claim
135 words
Device for adjusting the ignition timing of an internal combustion engine comprising: (a) a vacuum adjusting device having a distributor retard chamber and a distributor advance chamber for controlling ignition timing, said distributor advance chamber being in communication with intake vacuum in an air intake line; (b) a vacuum chamber; (c) a thermoswitch actuatable in response to the temperature of engine intake air exceeding a predetermined value; (d) a throttle valve switch actuatable in response to a flow regulator means in said air intake line assuming a full or high load range position; and (e) control valve means for communicating said distributor retard chamber with ambient pressure in a first position thereof and for communicating said distributor retard chamber with said vacuum chamber upon conjoint actuation of both of said thermoswitch and throttle valve switch.
Claim 3
Dependent Claim
38 words
A device according to claim 1, wherein the control valve means includes a control piston, and an electromagnet means for actuating the control piston, said thermo-switch and said throttle valve switch being operatively associated with said electromagnet means.
Claim 4
Dependent Claim
40 words
A device according to claim 2, wherein the control valve means is provided with ports cooperating with the position of said control piston selectively to vent said distributor retard chamber or to connect said retard chamber with said vacuum chamber.
Claim 5
Dependent Claim
27 words
A device according to claim 1, wherein there is provided a control cam means operatively associated with said flow regulator means for actuating said throttle valve switch.
Claim 6
Dependent Claim
20 words
A device according to claim 1, wherein said thermo-switch is provided in an air filter of the internal combustion engine.
Claim 7
Dependent Claim
27 words
A device according to claim 5, wherein there is provided a control cam means operatively associated with said flow regulator means for actuating said throttle valve switch.
Claim 8
Dependent Claim
37 words
A device according to claim 6, wherein the control valve includes a control piston, and an electromagnet means for actuating the control piston, said thermo-switch and said throttle valve switch being operatively associated with said electromagnet means.
Claim 9
Dependent Claim
40 words
A device according to claim 7, wherein the control valve is provided with ports cooperating with the position of said control piston selectively to vent said distributor retard chamber or to connect said retard chamber with a vacuum ballast chamber.
Claim 10
Dependent Claim
124 words
Device for adjusting the ignition timing of an internal combustion engine as a function of intake vacuum in an intake line, provided with a flow-regulating element for the intake air of the internal combustion engine, by a vacuum-adjusting device comprising a distributor advance chamber and a distributor retard chamber, wherein said adjusting device comprises control means for adjusting the ignition timing as a function of the temperature of the intake air and full or high load conditions, the control means being formed by a thermoswitch, directly influenceable by the temperature of the intake air, a throttle flap switch actuatable as a function of the position of the flow-controlling element, and a control valve which influences the vacuum advance in cooperation with a vacuum chamber.
Claim 11
Dependent Claim
124 words
Device for adjusting the ignition timing of an internal combustion engine as a function of intake vacuum in an intake line, provided with a flow-regulating element for the intake air of the internal combustion engine, by a vacuum-adjusting device comprising a distributor advance chamber and a distributor retard chamber, wherein said adjusting device comprises control means for adjusting the ignition timing as a function of the temperature of the intake air and full or high load conditions, the control means being formed by a thermoswitch, directly influenceable by the temperature of the intake air, a throttle flap switch actuatable as a function of the position of the flow-controlling element, and a control valve which influences the vacuum advance in cooperation with a vacuum chamber.
References Cited (Backward Citations)
US3426737A
Cited
US3543738A
Cited
US3665904A
Cited
US3828743A
Cited
US3978831A
Cited
US4016844A
Cited
DE2552321A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-30 | 1984-06-30 | 1984-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-30 | 1988-06-30 | 1988-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-30 | 1992-06-30 | 1992-12-30 | $7700.00 | Window Closed / Lapsed |