US4162669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ignition system for rotary piston engines
Assignee: Toyota Motor Corp
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Filing: 1978-02-02
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Granted: 1979-07-31
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Expires: 1998-02-02
Abstract
Abstract An ignition system for rotary piston engine wherein a glow plug mounted in the epitrochoidal housing of the engine is supplied with electric power to maintain the surface temperature of the glow plug within a range from 900° to 1100° C. A control unit for controlling the supply of electric power to the glow plug produces an output pulse signal the pulse width thereof being varied depending on engine operating conditions such as the amount of fuel supply and engine rotational speeds. A power circuit receives the pulse signal from the control unit and on-off controls the supply of electric power to the plug from a battery.
Inventors
- 👤 Toshihiko Igashira
- 👤 Shunzo Yamaguchi
- 👤 Hisasi Kawai
- 👤 Seiji Morino
- 👤 Naoki Umeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:09
CPC Classifications
F; F02; F02B; F02B53/00; F02B53/12; F02P; F02P15/00; F02P15/001; F02P15/005; F02B1/00; F02B1/02; F02B1/04; F02B2053/005; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
124 words
An ignition system for a rotary piston engine comprising: a glow plug mounted in an epitrochoidal housing of an engine on the leading side of the trochoidal minor axis of said housing in the direction of rotation of a rotor; engine speed detecting means for detecting the rotational speed of said engine; parameter detecting means for detecting the amount of fuel supply to said engine or an engine operating parameter related to said amount of fuel supply; and an ignition control circuit connected to said engine speed detecting means and said parameter detecting means and responsive to the signals therefrom to control the supply of power to said glow plug thereby to maintain the temperature of said glow plug within a predetermined temperature range.
Claim 2
Dependent Claim
124 words
An ignition system for a rotary piston engine comprising: a glow plug mounted in an epitrochoidal housing of an engine on the leading side of the trochoidal minor axis of said housing in the direction of rotation of a rotor; engine speed detecting means for detecting the rotational speed of said engine; parameter detecting means for detecting the amount of fuel supply to said engine or an engine operating parameter related to said amount of fuel supply; and an ignition control circuit connected to said engine speed detecting means and said parameter detecting means and responsive to the signals therefrom to control the supply of power to said glow plug thereby to maintain the temperature of said glow plug within a predetermined temperature range.
Claim 3
Dependent Claim
52 words
An ignition system according to claim 1, wherein said ignition control circuit supplies to said glow plug an amount of electric power determined by the following equation or power substantially equivalent to said amount: P=A-B×(F/N) where P=power supply (W), A and B=constants, N=engine rotational speed (rpm), and F=amount of fuel supply (g/rev).
Claim 4
Dependent Claim
27 words
An ignition system according to claim 1, wherein said parameter detecting means comprises a vacuum detector for detecting the vacuum in the intake pipe of said engine.
Claim 5
Dependent Claim
54 words
An ignition system according to claim 3, wherein said ignition control circuit supplies to said glow plug an amount of power determined by the following equation or power substantially equivalent to said amount: P=α-(β/N) (γ-B.sub.O) where P=power supply (W), α, β and γ=constants, N=engine rotational speed (rpm), and B o =intake pipe vacuum (mmHg).
Claim 6
Dependent Claim
18 words
An ignition system according to claim 1, wherein said predetermined temperature range is from 900° to 1110° C.
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) | 1982-07-30 | 1983-01-29 | 1983-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-30 | 1987-01-29 | 1987-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-30 | 1991-01-29 | 1991-07-31 | $7700.00 | Window Closed / Lapsed |