US3853103A
Expired / Lapsed
US
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Ignition timing control system for internal combustion engine ignition systems
Assignee: Robert Bosch GmbH
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Filing: 1973-02-28
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Granted: 1974-12-10
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Expires: 1993-02-28
Abstract
Abstract A pulse generator provides a pulse train representative of angular position of the engine crankshaft, and a marker pulse, at a predetermined angular crankshaft position. A counter is connected to the train of pulses, to start counting upon occurrence of the marker pulses. A digital/analog converter converts the binary count numbers into an analog signal, which is compared with engine operation signals representative of spark advance or retardation, the comparator providing an output when the count derived from the counter and the operation parameter control signals match. The engine operation control signal may be a composite of signals commanding spark advance or spark retardation, such as speed signals, load signals or other operating parameter signals, applied to the comparator as varying voltages or currents.
Inventors
- 👤 J Wahl
- 👤 W Wessel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:39
CPC Classifications
F; F02; F02P; F02P5/00; F02P5/04; F02P5/145; F02P5/15; F02P3/00; F02P3/02; F02P3/04; F02P3/045; F02P3/0453; F02P3/0456; F02P5/155; F02B; F02B1/00; F02B1/02; F02B1/04; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
265 words
Ignition timing control system for internal combustion engine ignition systems comprising pulse generator means (10) providing output pulses synchronized with engine rotation; a control signal generation means (10, 27, 29; 31, 34; 35) providing a signal representative of engine operation, operating, or environmental parameters; a binary counter (15) connected to the pulse generator means and counting in synchronism with engine rotation; counter start means (108, 12, 13) connected to said pulse generator means (10) and generating a marker pulse representative of a predetermined angular position of the crankshaft, said counter start means being connected to said counter (15) to start a counting cycle thereof; a comparator means (21) having one input connected to the output of the counter (15) and another input connected to the output of the control signal generation means to compare the timed occurrence of a predetermined pulse count with the value of the control signal and providing an output ignition pulse forming a start signal to initiate an ignition pulse in accordance with angular position of the crankshaft as determined by the count of the counter and the value of the control signal representative of said parameter; means (23, 26) connected to said comparator means (21) and sensing occurrence of said start signal, and connected to reset said counter (15) upon sensing said start signal, said counter thereby starting a second count cycle; and preset means connected to said counter and establishing a predetermined count number of said counter, said counter, when reaching said predetermined count number, providing a counter stop pulse forming a stop signal to terminate the ignition pulse.
Claim 2
Dependent Claim
265 words
Ignition timing control system for internal combustion engine ignition systems comprising pulse generator means (10) providing output pulses synchronized with engine rotation; a control signal generation means (10, 27, 29; 31, 34; 35) providing a signal representative of engine operation, operating, or environmental parameters; a binary counter (15) connected to the pulse generator means and counting in synchronism with engine rotation; counter start means (108, 12, 13) connected to said pulse generator means (10) and generating a marker pulse representative of a predetermined angular position of the crankshaft, said counter start means being connected to said counter (15) to start a counting cycle thereof; a comparator means (21) having one input connected to the output of the counter (15) and another input connected to the output of the control signal generation means to compare the timed occurrence of a predetermined pulse count with the value of the control signal and providing an output ignition pulse forming a start signal to initiate an ignition pulse in accordance with angular position of the crankshaft as determined by the count of the counter and the value of the control signal representative of said parameter; means (23, 26) connected to said comparator means (21) and sensing occurrence of said start signal, and connected to reset said counter (15) upon sensing said start signal, said counter thereby starting a second count cycle; and preset means connected to said counter and establishing a predetermined count number of said counter, said counter, when reaching said predetermined count number, providing a counter stop pulse forming a stop signal to terminate the ignition pulse.
Claim 3
Dependent Claim
49 words
System according to claim 1, wherein the output of the control signal generation means is a continuously variable analog signal; and the system comprises a digital/analog converter (17) connected between the counter (15) and the one input of the comparator (21) to permit the comparator to compare analog values.
Claim 4
Dependent Claim
44 words
System according to claim 1, wherein the means to sense occurrence of the start signal comprises a bistable flip-flop (23) connected to the output of the comparator (21), the output of said flip-flop being applied to the ignition system to initiate the ignition pulse.
Claim 5
Dependent Claim
32 words
System according to claim 3 wherein the preset means comprises a decoder (19) connected to the counter (15) and proViding a reset pulse to the flip-flop (23) to terminate the ignition pulse.
Claim 6
Dependent Claim
57 words
System according to claim 1, wherein the control signal generation means comprises means sensing engine speed and providing a speed dependent output signal; means sensing loading of the engine and providing a load-dependent output signal; and summing means (35) summing the speed and load dependent signals and applying a composite engine operation parameter signal to said comparator.
Claim 7
Dependent Claim
28 words
System according to claim 5, further comprising an additional control input (35'') connected to the summing means (35) to apply additional engine operation, operating, or environmental parameters thereto.
Claim 8
Dependent Claim
32 words
System according to claim 5, wherein the comparator is a current comparator (65); and the signals derived from the summing means and the binary counter are currents varying in magnitude and sign.
Claim 9
Dependent Claim
49 words
System according to claim 1, wherein the pulse generator means has a pulse train output (109) providing a pulse train representative of engine angular crankshaft position and a marker pulse output (108) forming said counter start means and providing a marker pulse representative of a predetermined angular crankshaft position.
Claim 10
Dependent Claim
56 words
System according to claim 8, wherein the counter (15) has a count input terminal (152) and a zero set and enabling terminal (151), the marker pulse output (108) being connected to the zero set and enabling terminal of the counter (15) and the pulse train output (109) being connected to the count input terminal (152) thereof.
Claim 11
Dependent Claim
34 words
System according to claim 9, wherein the control signal generation means comprises means (27, 28) providing a speed-dependent signal, said means being connected to the pulse train output (109) of the pulse generator (10).
Claim 12
Dependent Claim
58 words
System according to claim 10, wherein the control signal generation means further comprises means sensing loading on the engine and providing a load-dependent output signal; and summing means (35) summing the speed-dependent signal derived from the pulse train output (109) of the pulse generator and the load-dependent signal, and applying a composite of said signals to the comparator.
Claim 13
Dependent Claim
44 words
System according to claim 9, wherein the counter start means further comprises a second flip-flop (12) having one terminal connected to the marker pulse output of the pulse generator (10) and its output connected to the zero set input (151) of the counter (15).
Claim 14
Dependent Claim
66 words
System according to claim 12, wherein the means to sense occurrence of the start signal comprises a bistable flip-flop (23) connected to the output of the comparator (21), the output of said flip-flop being applied to the ignition system and to initiate the ignition pulse; and means (26) further connecting the output of said first flip-flop (23) to the reset terminal of the second flip-flop (12).
Claim 15
Dependent Claim
89 words
System according to claim 9, wherein the means to sense occurrence of the start signal comprises a bistable flip-flop (23) connected to the output of the comparator (21), the output of the flip-flop being applied to the ignition system to initiate the ignition pulse; and means (26) connecting the output of the first flip-flop (23) to the zero set and enabling input (151) of the counter (15) to reset and enable counting after each ignition pulse and provide for the second count cycle by continued counting of the counter.
Claim 16
Dependent Claim
58 words
System according to claim 14, further comprising means (26) connecting the output of the first flip-flop (23) to the reset terminal of the second flip-flop 12; and an OR-gate (13) connecting the output of the second flip-flop (12) and the means (26) connecting the output of the first flip-flop (23) to the zero set input of the counter.
Claim 17
Dependent Claim
42 words
System according to claim 1, wherein the preset means comprises a decoder (19) connected to the counter (15) and set to generate said counter stop pulse upon sensing that the decoded count state of the counter has reached said predetermined count number.
Claim 18
Dependent Claim
26 words
System according to claim 3, wherein the preset means (19) is connected to the flip-flop (23) and providing a reset pulse to terminate the ignition pulse.
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) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |