US3874351A
Expired / Lapsed
US
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Electronic ignition pulse generating and timing control system for internal combustion engines
Assignee: Robert Bosch GmbH
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Filing: 1974-02-04
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Granted: 1975-04-01
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Expires: 1994-02-04
Abstract
Abstract A comparator stage is connected to the output of a sawtooth wave generator which provides sawtooth waves, in synchronism with engine rotation. When the sawtooth wave reaches a predetermined value matched to a voltage representative of an engine operating parameter, as modified by engine operating characteristic functions, in a function generator, a signal is transmitted to the ignition pulse generating system to provide an ignition pulse at a proper timing instant, determined by the engine function characteristics in dependence on the operating parameter.
Inventors
- 👤 Karl-Heinz Asler
- 👤 Andre Bonin
- 👤 Georges Dubuisson
- 👤 Michel Juhe
- 👤 Wolfgang Reichardi
- 👤 Edwin Fauser
- 👤 Hermann Eisele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:56
CPC Classifications
F; F02; F02P; F02P5/00; F02P5/04; F02P5/145; F02P5/155; F02P5/1553; F02P5/1556; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
363 words
Electronic ignition pulse generation and timing control circuit for internal combustion engines, in which the timing of the ignition pulse with respect to piston position of the internal combustion engine is controlled in dependence on engine operating parameters, comprising pulse generating means (2) to generate a pulse (A) having a predetermined time relation with respect to piston position; ignition pulse generating means (7, 70, 71) to generate ignition pulses for connection to a spark plug of the engine; engine operation parameter signal generation means (15, 16, 17) providing signals (U2) representative of engine operating conditions; a sawtooth wave generator (10) connected to and controlled by the pulse generator means (2); and means deriving an ignition control signal connected to the ignition pulse generating means (7, 70, 71) to control generation of the ignition pulse at a predetermined instant of time with respect to said piston position, characterized in that the Operation signal parameter generating means comprises at least one function generator (15, 16), a storage circuit (11) storing an electrical quantity representative of the timing of a prior ignition pulse with respect to said piston position, the output (C) of the sawtooth wave generator (10) being connected to the storage circuit (11); a monostable flip-flop (4) connected to be triggered (D) by the trailing flank from the pulse (A) of the pulse generating means (2), and connecting said storage circuit (11) to store a value (e) of the sawtooth wave (C) upon termination of the pulse from the monostable FF (4), said value (E) being connected as an input to the function generator, or generators (15, 16), to modify the output of the stored quantity by a function of an operating parameter of the engine, the output from said function generator, or generators forming the output of the engine operating parameter signal generating means; and a comparator (13) having one input connected to the output of the sawtooth wave generator (13) and another input connected to the output of the function generator, or generators (15, 16) and providing an ignition control signal to said ignition pulse generating means upon coincidence of output from said sawtooth wave generator and said function generator, or generators.
Claim 2
Dependent Claim
363 words
Electronic ignition pulse generation and timing control circuit for internal combustion engines, in which the timing of the ignition pulse with respect to piston position of the internal combustion engine is controlled in dependence on engine operating parameters, comprising pulse generating means (2) to generate a pulse (A) having a predetermined time relation with respect to piston position; ignition pulse generating means (7, 70, 71) to generate ignition pulses for connection to a spark plug of the engine; engine operation parameter signal generation means (15, 16, 17) providing signals (U2) representative of engine operating conditions; a sawtooth wave generator (10) connected to and controlled by the pulse generator means (2); and means deriving an ignition control signal connected to the ignition pulse generating means (7, 70, 71) to control generation of the ignition pulse at a predetermined instant of time with respect to said piston position, characterized in that the Operation signal parameter generating means comprises at least one function generator (15, 16), a storage circuit (11) storing an electrical quantity representative of the timing of a prior ignition pulse with respect to said piston position, the output (C) of the sawtooth wave generator (10) being connected to the storage circuit (11); a monostable flip-flop (4) connected to be triggered (D) by the trailing flank from the pulse (A) of the pulse generating means (2), and connecting said storage circuit (11) to store a value (e) of the sawtooth wave (C) upon termination of the pulse from the monostable FF (4), said value (E) being connected as an input to the function generator, or generators (15, 16), to modify the output of the stored quantity by a function of an operating parameter of the engine, the output from said function generator, or generators forming the output of the engine operating parameter signal generating means; and a comparator (13) having one input connected to the output of the sawtooth wave generator (13) and another input connected to the output of the function generator, or generators (15, 16) and providing an ignition control signal to said ignition pulse generating means upon coincidence of output from said sawtooth wave generator and said function generator, or generators.
Claim 3
Dependent Claim
30 words
Circuit according to claim 1, further comprising means (3) triggering start of generation of sawtooth waves from the leading flank of the pulse (A) generated by the pulse generator (A).
Claim 4
Dependent Claim
90 words
Circuit according to claim 1, further comprising a speed threshold switch (12) connected to sense a predetermined engine operating speed; and a high-low speed switch (6) connected in advance of the ignition pulse generating means (7, 70, 71) and, selectively, controlling timing of the ignition pulse generating means from (a) said comparator or (b) said pulse generator, under command of the threshold switch and in dependence upon whether (a) the speed of the engine is in excess of a predetermined value or (b) said speed is below said predetermined value.
Claim 5
Dependent Claim
30 words
Circuit according to claim 1, wherein the function generator means comprises a function generator modifying the signal from the storage means by a function representative of input manifold pressure (P).
Claim 6
Dependent Claim
30 words
Circuit according to claim 1, wherein the function generator means comprises a function generator (15) modifying the signal from the storage means by a function representative of engine speed (n).
Claim 7
Dependent Claim
98 words
Circuit according to claim 1, wherein the monostable flip-flop (4) comprises complementary outputs; the storage circuit (11) comprises two transistors (102, 107), one each controlled by an output from the monostable flip-flop (4); an operational amplifier (109) connected to and controlled by the sawtooth wave generator (10), and having an output connected to the first transistor (107), said transistor short-circuiting the output from the operational amplifier upon absence of a complementary signal from the monostable FF (4); a storage capacitor (104) and a diode (111) connecting the storage capacitor to the inverting input of the operational amplifier (109).
Claim 8
Dependent Claim
31 words
Circuit according to claim 6, further comprising resistance means (105) connecting the inverting input of the operational amplifier to the emitter-collector path of the second transistor (102), and to ground (G).
Claim 9
Dependent Claim
43 words
Circuit according to claim 2, wherein the speed threshold switch (12) comprises an operational amplifier (201), said operational amplifier being connected as a comparator, and comparing a reference voltage (V, G; 202, 203) with a voltage representative of speed of the engine (E).
Claim 10
Dependent Claim
41 words
Circuit according to claim 8, wherein the output of the comparator (13) is connected over a diode (205) with the output of the operational amplifier (201) in the speed threshold switch (12) and to the base of a switching transistor (213).
Claim 11
Dependent Claim
55 words
Circuit according to claim 9, wherein the output voltage (A) of the pulse generator stage (2) is connected to the base of the switching transistor (213); and a short-circuiting transistor (209), the conduction of which is controlled by the output of the operational amplifier (201) short-circuiting, selectively, the pulse (A) from the pulse generator means.
Claim 12
Dependent Claim
39 words
Circuit according to claim 1, further comprising (FIG. 5) a speed sensing stage (19), connected to and controlled by the pulse generator (2); the output of the speed sensing stage being connected to the input of the comparator (13).
Claim 13
Dependent Claim
54 words
Circuit according to claim 11, wherein the speed sensing stage (19) comprises a monostable circuit (190) and a logic gate (91), the output signal (H) from the logic gate arising if: (a) the unstable time of the monostable circuit (190) is shorter than the duration of the pulse (A) from the pulse generator (2).
Claim 14
Dependent Claim
54 words
Circuit according to claim 11, wherein the output from the speed sensing stage (19) is combined with the output of the function generator, or generators, the output of the speed sensing stage being much larger with respect to the output, or ouputs of the function generator, or generators, and and dominating said function signals.
Claim 15
Dependent Claim
62 words
Circuit according to claim 1, further comprising (FIG. 5, FIG. 7, FIG. 8) a controlled current source (18); a monostable flip-flop (70) connected to and included in said ignition pulse generating means, the output of said controlled current source determining the unstable time of said monostable FF (70), the controlled current source being controlled by the output of said storage circuit (11).
Claim 16
Dependent Claim
24 words
Circuit according to claim 14, wherein the ON time of the monostable FF (70) is controlled to decrease with increasing speed of the engine.
Claim 17
Dependent Claim
64 words
Circuit according to claim 15, wherein a controlled rectifier (312) is included in said controlled current source (18), the conduction of said controlled rectifier being controlled by the signal (E) from the storage circuit (11); a capacitor (301) is provided, the charge state of said capacitor being controlled by the current from said controlled rectifier to determine the ON time of the monostable FF.
Claim 18
Dependent Claim
33 words
Circuit according to claim 16, further comprising a diode (318) in the controlled current source (18) to provide a sharp bend or knee in the ignition energy-speed curve of the speed-ignition energy characteristics.
Claim 19
Dependent Claim
74 words
Circuit according to claim 1, wherein the pulse generating means (2) provides a pulse (A) beginning at a predetermined time instant in advance of the upper dead center position of a piston of the internal combustion engine; and terminates at the time said piston reaches said dead center position, the pulse generating means being connected to and controlled by the internal combustion engine and providing said pulses in synchronism with rotation of the engine.
Claim 20
Dependent Claim
168 words
Circuit according to claim 1, wherein the sawtooth wave generator is connected to and controlled by the leading flank of the pulse generator means (2) to start a timing interval, by providing a rising output voltage (C) connected to the comparator; and said comparator compares the instantaneous value of said rising current wave (C) from the sawtooth wave generator with a voltage value representative of operating functions and parameters of the engine including at least one of: speed; inlet manifold vacuum, the comparator, upon coincidence of voltages, providing an output signal to control the ignition generating means to provide an ignition pulse, said voltage from said function generator means being less than the maximum voltage from said sawtooth wave generator (10) to provide an ignition pulse in advance of upper dead center position of the piston, the extent of advance of ignition timing being controlled by the operating parameter, or parameters of the engine, in accordance with the timing-parameter change function, as determined by the function generator means.
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) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |