US3923023A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ignition timing control devices for automotive vehicles
Assignee: Denso Corp
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Filing: 1973-09-28
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Granted: 1975-12-02
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Expires: 1993-09-28
Abstract
Abstract Ignition timing control devices for automobiles incorporating a vacuum advance circuit is disclosed. A magnetic temperature responsive switch detects the temperature of cooling water flowing from the engine to a radiator wherein the switch is open when the water temperature is between 60*C and about 100*C, with the output of the switch being coupled to a three-way or two-way solenoid valve. The solenoid valve is actuated so that the vacuum advance circuit transmits the negative pressure of the intake air to a diaphragm chamber of a distributor which constitutes part of the vacuum advance mechanism when the temperature of the cooling water is lower than about 60*C or in excess of about 100*C. When the switch is closed, the three-way or two-way solenoid valve is actuated to permit the communication of the diaphragm chamber with the surrounding air. A speed responsive valve is also disclosed which closes when the speed of the vehicle increases past a predetermined level to thereby operate the three-way or two-way solenoid valve to permit vacuum advancing above the predetermined speed level. The efficiency of the vacuum advance mechanism is thereby improved and the reliable operation of the engine is insured.
Inventors
- 👤 Mikiji Ito
- 👤 Yoshi Suzuki
- 👤 Kiyohiku Mizuno
- 👤 Susumu Urano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:22
CPC Classifications
F; F02; F02P; F02P5/00; F02P5/04; F02P5/05; F02P5/10; F02P5/103; F02P5/106
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
322 words
In an automotive engine including a hose through which cooling water flows from the engine to a radiator and a vacuum advance mechanism having a carburetor and a distributor including a diaphragm chamber, an ignition control device comprising a thermosensitive switch which is fixed to said hose through which cooling water flows from the engine to said radiator and being adapted to detect the temperature of said cooling water, said thermosensitive switch including two permanent magnets disposed in series, two thermal ferrites of which Curie points are about 60*C and about 100*C, respectively, which are interposed between said permanent magnets, and a reed switch at least partially surrounded by said permanent magnets and thermal ferrites, an electromagnetic valve including a chamber formed therein having an atmospheric port through which said chamber is communicated with the surrounding air and an outlet port; a T-shaped conduit communicating said carburetor and said diaphragm chamber with said outlet port of said electromagnetic valve, said electromagnetic valve further including an electromagnetic coil, a spring mounted in said chamber and a moving core contained in said chamber and biased by said spring; a source of electric power, the terminals of said electromagnetic coil being connected between said source of electric power and said switch wherein when said coil is energized said moving core is displaced to close said atmospheric port; and said device further comprising at least one orifice which is inserted into said T-shaped conduit wherein when said temperature of said water is below about 60*C and above about 100*C said switch is closed to energize said electromagnetic coil to close said atmospheric port and thereby advance said distributor by the air pressure of said carburetor and wherein when the temperature of said water is between about 60*C and 100*C said switch is opened to thereby deenergize said electromagnetic coil so that atmospheric pressure and the pressure of said carburetor are both transmitted to said diaphragm chamber.
Claim 2
Dependent Claim
322 words
In an automotive engine including a hose through which cooling water flows from the engine to a radiator and a vacuum advance mechanism having a carburetor and a distributor including a diaphragm chamber, an ignition control device comprising a thermosensitive switch which is fixed to said hose through which cooling water flows from the engine to said radiator and being adapted to detect the temperature of said cooling water, said thermosensitive switch including two permanent magnets disposed in series, two thermal ferrites of which Curie points are about 60*C and about 100*C, respectively, which are interposed between said permanent magnets, and a reed switch at least partially surrounded by said permanent magnets and thermal ferrites, an electromagnetic valve including a chamber formed therein having an atmospheric port through which said chamber is communicated with the surrounding air and an outlet port; a T-shaped conduit communicating said carburetor and said diaphragm chamber with said outlet port of said electromagnetic valve, said electromagnetic valve further including an electromagnetic coil, a spring mounted in said chamber and a moving core contained in said chamber and biased by said spring; a source of electric power, the terminals of said electromagnetic coil being connected between said source of electric power and said switch wherein when said coil is energized said moving core is displaced to close said atmospheric port; and said device further comprising at least one orifice which is inserted into said T-shaped conduit wherein when said temperature of said water is below about 60*C and above about 100*C said switch is closed to energize said electromagnetic coil to close said atmospheric port and thereby advance said distributor by the air pressure of said carburetor and wherein when the temperature of said water is between about 60*C and 100*C said switch is opened to thereby deenergize said electromagnetic coil so that atmospheric pressure and the pressure of said carburetor are both transmitted to said diaphragm chamber.
Claim 3
Dependent Claim
41 words
The ignition control device of claim 1 further comprising a speed responsive switching means connected in parallel with said thermosensitive switch for energizing said electromagnetic coil to close said atmospheric port when the speed of said vehicle exceeds a predetermined level.
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) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |