US3901201A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic spark timing control system for internal combustion engine
Assignee: Nissan Motor Co Ltd
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Filing: 1973-12-26
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Granted: 1975-08-26
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Expires: 1993-12-26
Abstract
Abstract Electromagnetic pick-up coils produce timing and reference timing pulses in synchronism with engine revolutions. These pulses occur at an adjustably spaced apart timing so that for starting operation ignition is provided at an advanced-timing using the timing pulse while inhibiting the reference timing pulse. For warming-up and normal operations, the timing pulse is inhibited while the reference pulse is enabled and delayed in accordance with a signal which varies in amplitude in accordance with particular timing characteristics of the engine for such operations. The voltage drop due to consumption of power by the engine starter during the starting operation has no adverse effect on the advance timing control during the starting operation.
Inventors
- 👤 Norio Mizuguchi
- 👤 Hiroshige Ozawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:30
CPC Classifications
F; F02; F02P; F02P5/00; F02P5/04; F02P5/145; F02P5/155; F02P5/1558; F02P5/1553; F02P5/1556; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
260 words
A system for controlling the ignition timing of an internal combustion engine in response to the characteristics of an engine, comprising, in combination: a. means for sensing the speed of the engine and producing a signal when said speed is below a predetermined speed; b. means for sensing the characteristics of said engine; c. function generating means operable by said characteristic sensing means for relating the speed of said engine to the timing of ignition for obtaining reduced emission when said engine is driven under predetermined characteristic; d. a direct-current power supply for supplying said function generating means with a direct-current potential; e. means for sensing the voltage level of said direct-current power supply and producing a signal when said voltage is below a predetermined level; f. first means for generating pulses in response to the speed of said engine at a reference timing relative to the zero angle position of the crankshaft of said engine; g. second means for generating pulses in response to the speed of said engine at an advanced timing relative to said reference timing; h. means for delaying the timing of the reference timing pulses in accordance with the output of said function generating means; and i. means for interconnecting said engine-speed sensing means, said voltage sensing means, said first and second pulse generating means and said function generating means for enabling said second pulse generating means when one of said engine speed sensing means and said voltage sensing means produces a signal while inhibiting said first pulse generating means and said function generating means.
Claim 2
Independent Claim
260 words
A system for controlling the ignition timing of an internal combustion engine in response to the characteristics of an engine, comprising, in combination: a. means for sensing the speed of the engine and producing a signal when said speed is below a predetermined speed; b. means for sensing the characteristics of said engine; c. function generating means operable by said characteristic sensing means for relating the speed of said engine to the timing of ignition for obtaining reduced emission when said engine is driven under predetermined characteristic; d. a direct-current power supply for supplying said function generating means with a direct-current potential; e. means for sensing the voltage level of said direct-current power supply and producing a signal when said voltage is below a predetermined level; f. first means for generating pulses in response to the speed of said engine at a reference timing relative to the zero angle position of the crankshaft of said engine; g. second means for generating pulses in response to the speed of said engine at an advanced timing relative to said reference timing; h. means for delaying the timing of the reference timing pulses in accordance with the output of said function generating means; and i. means for interconnecting said engine-speed sensing means, said voltage sensing means, said first and second pulse generating means and said function generating means for enabling said second pulse generating means when one of said engine speed sensing means and said voltage sensing means produces a signal while inhibiting said first pulse generating means and said function generating means.
Claim 3
Independent Claim
396 words
A system for controlling the ignition timing of an internal combustion engine in response to the characteristics of an engine of an automotive vehicle having a change speed gear, comprising, in combination: a. means for sensing the speed of the engine and producing a signal when said speed is below a predetermined speed; b. means for sensing the temperature of said engine and producing a signal when said temperature is above a predetermined level; c. means for sensing the gear positions of said change speed gear; d. first function generating means operable by said temperature sensing means for relating the speed of said engine to the timing of ignition for obtaining reduced emissions when said engine is warmed up; e. second function generating means operable by said gear-position sensing means for relating the speed of said engine to the timing of ignition for obtaining reduced emissions when said engine is driven at normal cruising speed; f. a direct-current power supply for supplying said first and second function generating means with a direct-current potential; g. means for sensing the voltage level of said direct-current power supply and producing a signal when said voltage level is below a predetermined level; h. first means for generating pulses in response to the speed of said engine at a reference timing relative to the zero angle position of the crankshaft of said engine; i. second means for generating pulses in response to the speed of said engine at an advanced timing relative to said reference timing; j. means for delaying the timing of the reference timing pulses in accordance with the output of said first and second function generating means; k. first means for interconnecting said engine-speed sensing means, said voltage sensing means, said first and second pulse generating means, said first and second function generating means and said gear-position sensing means for enabling said second pulse generating means when one of said engine-speed sensing means and said voltage sensing means produces a signal and said change-speed gear is at neutral position while inhibiting said first pulse generating means and said first and second function generating means; and l. second means for interconnecting the gear-position sensing means, said engine-temperature sensing means and said first and second function generating means for enabling said first function generating means when said gear is at a driving position while inhibiting said second function generating means.
Claim 4
Independent Claim
396 words
A system for controlling the ignition timing of an internal combustion engine in response to the characteristics of an engine of an automotive vehicle having a change speed gear, comprising, in combination: a. means for sensing the speed of the engine and producing a signal when said speed is below a predetermined speed; b. means for sensing the temperature of said engine and producing a signal when said temperature is above a predetermined level; c. means for sensing the gear positions of said change speed gear; d. first function generating means operable by said temperature sensing means for relating the speed of said engine to the timing of ignition for obtaining reduced emissions when said engine is warmed up; e. second function generating means operable by said gear-position sensing means for relating the speed of said engine to the timing of ignition for obtaining reduced emissions when said engine is driven at normal cruising speed; f. a direct-current power supply for supplying said first and second function generating means with a direct-current potential; g. means for sensing the voltage level of said direct-current power supply and producing a signal when said voltage level is below a predetermined level; h. first means for generating pulses in response to the speed of said engine at a reference timing relative to the zero angle position of the crankshaft of said engine; i. second means for generating pulses in response to the speed of said engine at an advanced timing relative to said reference timing; j. means for delaying the timing of the reference timing pulses in accordance with the output of said first and second function generating means; k. first means for interconnecting said engine-speed sensing means, said voltage sensing means, said first and second pulse generating means, said first and second function generating means and said gear-position sensing means for enabling said second pulse generating means when one of said engine-speed sensing means and said voltage sensing means produces a signal and said change-speed gear is at neutral position while inhibiting said first pulse generating means and said first and second function generating means; and l. second means for interconnecting the gear-position sensing means, said engine-temperature sensing means and said first and second function generating means for enabling said first function generating means when said gear is at a driving position while inhibiting said second function generating means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |