Patent US3861372A successfully refreshed from Google Patents.
US3861372A
Expired / Lapsed
US
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Electrical advance device for an ignition timing
Assignee: Hitachi Ltd
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Filing: 1973-01-22
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Granted: 1975-01-21
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Expires: 1993-01-22
Abstract
Abstract Electrical advance control device for controlling the ignition timing of the ignition circuit of an internal combustion engine having a pulse generating means for generating positive and negative pulses with a different timing, a positive pulse rectifier means for triggering the ignition circuit in accordance with the positive pulse, a negative pulse rectifier means for triggering the ignition circuit in accordance with the negative pulse and a controlling means for controlling the operations of said positive and negative pulse rectifier means in response to the engine speed. It is assumed that the negative timing pulse is generated at an earlier time than that of the positive pulse. When the engine speed is at a low level, the operation of the negative pulse rectifier means is stopped by the operation of the controlling means so that the ignition timing is determined by the timing of the positive pulses. When the engine speed is at a low level, the ignition timing is determined by the positive pulse timing. Therefore, said ignition timing is advanced in response to the engine condition from the timing of the positive pulse to the timing of the negative pulse.
Inventors
- 👤 Suetaroo Shibukawa
- 👤 Osamu Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:34
CPC Classifications
H; H02; H02K; H02K21/00; H02K21/12; H02K21/22; H02K21/222; H02K21/225; F; F02; F02P; F02P1/00; F02P1/08; F02P1/086
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
97 words
An advance control device for controlling an ignition timing of the ignition circuit for an internal combustion engine comprising: a pulse generator for generating positive and negative pulses with different timing; rectifier means including positive pulse rectifier means for passing the positive pulses and negative pulse rectifier means for passing the negative pulses generated by said pulse generator; speed detecting means for detecting engine speed; and means for changing the operation of said rectifier means to that of a full-wave rectifier from that of a half-wave rectifier in response to the output from said speed detecting means.
Claim 2
Dependent Claim
97 words
An advance control device for controlling an ignition timing of the ignition circuit for an internal combustion engine comprising: a pulse generator for generating positive and negative pulses with different timing; rectifier means including positive pulse rectifier means for passing the positive pulses and negative pulse rectifier means for passing the negative pulses generated by said pulse generator; speed detecting means for detecting engine speed; and means for changing the operation of said rectifier means to that of a full-wave rectifier from that of a half-wave rectifier in response to the output from said speed detecting means.
Claim 3
Dependent Claim
132 words
An advance control device as defined in claim 1, wherein said pulse generator includes a coil providing a substantially sinusoidal output voltage, said positive pulse rectifier means including a first diode and a second diode respectively connected to opposite ends of said coil and being poled in the same direction along a current path through said coil, the ends of said first and second diodes opposite said coil being connected to said ignition circuit, said negative pulse rectifier means including a thyristor connected in series opposition with said second diode across said coil, the gate electrode of said thyristor being connected to a voltage dividing circuit across said coil, and a third diode connected between the opposite end of said first diode and the connection of said coil and said second diode.
Claim 4
Dependent Claim
33 words
An advance control device according to claim 1 wherein said negative pulse rectifier means includes a thyristor and wherein the gate of said thyristor is connected to said pulse generator through a resistor.
Claim 5
Dependent Claim
50 words
An advance control device according to claim 3 wherein said negative and positive pulse rectifier means are connected to the input of the ignition circuit through a pulse circuit for forming a pulse applied to said ignition input terminal in response to an output of said respective pulse rectifier means.
Claim 6
Dependent Claim
58 words
An advance control device in accordance with claim 1 wherein said positive and negative pulse rectifier means incluDe three diodes and a thyristor in a bridge circuit and input terminals connected to output terminals of said pulse generator, the gate of the thyristor being connected to the output terminal of said pulse generator through a voltage dividing resistor.
Claim 7
Dependent Claim
64 words
An advance control device as defined in claim 2 wherein said ignition circuit includes a timing thyristor for controlling ignition timing, and charge storage means including at least one capacitor connected to said first and third diodes and the gate electrode of said timing thyristor for gating said timing thyristor in response to the first voltage pulse received via said first and third diodes.
Claim 8
Dependent Claim
19 words
An advance control device as defined in claim 6 wherein a voltage dividing circuit includes a temperature variable resistor.
Claim 9
Dependent Claim
137 words
An advance control device for controlling the ignition timing of an ignition circuit of an internal combustion engine comprising: first means for generating first and second electrical signals having respective opposite polarities separated from each other with respect to time; and second means for applying said first electrical signal to said ignition circuit in response to a first prescribed engine condition, and for rectifying said second electrical signal and applying at least said rectified second electrical signal to said ignition circuit in response to a second prescribed engine condition; wherein said second means comprises a controlled rectifier circuit which effects half-wave rectification of said first and second electrical signals in response to said first prescribed engine condition and which effects full-wave rectification of said first and second electrical signals in response to said second prescribed engine condition.
Claim 10
Dependent Claim
137 words
An advance control device for controlling the ignition timing of an ignition circuit of an internal combustion engine comprising: first means for generating first and second electrical signals having respective opposite polarities separated from each other with respect to time; and second means for applying said first electrical signal to said ignition circuit in response to a first prescribed engine condition, and for rectifying said second electrical signal and applying at least said rectified second electrical signal to said ignition circuit in response to a second prescribed engine condition; wherein said second means comprises a controlled rectifier circuit which effects half-wave rectification of said first and second electrical signals in response to said first prescribed engine condition and which effects full-wave rectification of said first and second electrical signals in response to said second prescribed engine condition.
Claim 11
Dependent Claim
46 words
An advance control device according to claim 8, wherein said second means comprises means for detecting the speed of said engine, said first prescribed engine condition corresponding to a relatively low engine speed and said second prescribed engine condition corresponding to a relatively high engine speed.
Claim 12
Dependent Claim
46 words
An advance control device according to claim 9, wherein said controlled rectifier circuit comprises three diodes and a thyristor forming a bridge circuit, connected between said first means and said ignition circuit, the control electrode of said thyristor being coupled to said engine speed detecting means.
Claim 13
Dependent Claim
32 words
An advance control device according to claim 10, including a voltage dividing resistor circuit connected across said first means, the control electrode of said thyristor being connected to said voltage dividing resistor.
Claim 14
Dependent Claim
20 words
An advance control device according to claim 11, wherein said voltage dividing resistor circuit includes a temperature variable resistance element.
Claim 15
Dependent Claim
40 words
An advance control device according to claim 8, wherein said first means comprises an electromagnet having a coil rotatably and magnetically coupled to a pole piece, the configuration of said pole piece defining the advance angle of said ignition circuit.
Claim 16
Dependent Claim
38 words
An advance control device according to claim 13 wherein said pole piece has respective cut-out and solid portions adjacent each other, the distance separating respective cut-out portions from each other determining the advance angle of said ignition circuit.
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) | 1978-01-20 | 1978-07-22 | 1979-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-20 | 1982-07-22 | 1983-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-20 | 1986-07-22 | 1987-01-21 | $7700.00 | Window Closed / Lapsed |