US3754537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection system especially for multi-cylinder internal combustion engines
Assignee: Robert Bosch GmbH
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Filing: 1972-03-03
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Granted: 1973-08-28
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Expires: 1992-03-03
Abstract
Abstract To provide proper allocation of fuel injected under electronic control, a sequence of electrical pulses, controlled by rotation of the engine are provided, the passage opening electromagnetic valves through which fuel can be injected. A signalling circuit which is inductively or capacitively coupled to an ignition wire provides a signal synchronized with ignition pulses, this signal being coupled to an electronic counter which steps in synchronism with the ignition pulses and the output counts of which control application of the valve pulses to the respective fuel injection valve associated with the cylinders of the internal combustion engine.
Inventors
- 👤 W Wessel
- 👤 J Wahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:36
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/30; F02D41/32; F02D41/36; F02D41/365
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
201 words
Fuel injection system for multicylinder internal combustion engines (10) having an ignition system including an ignition coil (47), a distributor (44, 45), a secondary coil - distributor wire (48) connecting the distributor in the secondary circuit of the ignition system, each cylinder having at least one spark plug wire (49) associated therewith and connected to the distributor, and spark plugs (50); a plurality of cyclically operating fuel injection valves (11); means (20, 56) controlled by the rotation of the engine and connected to said valves to generate, in sequence, electrical pulses (19) to open said valves upon application of the pulse, the duration of a pulse determining the opening period of said valves (11), and a signaling circuit comprising a pair of windings (51, 58), one of the windings (51) being coupled to one of the spark plug wires (49) and the other of the windings (58) being coupled to the coil-distributor wire (48) of the ignition system having a pulse appearing there on for each firing of a spark plug of the engine the output of said signaling circuit being coupled to said pulse generating and connection means (20, 56) to control the distribution of the pulse to the valves.
Claim 2
Dependent Claim
201 words
Fuel injection system for multicylinder internal combustion engines (10) having an ignition system including an ignition coil (47), a distributor (44, 45), a secondary coil - distributor wire (48) connecting the distributor in the secondary circuit of the ignition system, each cylinder having at least one spark plug wire (49) associated therewith and connected to the distributor, and spark plugs (50); a plurality of cyclically operating fuel injection valves (11); means (20, 56) controlled by the rotation of the engine and connected to said valves to generate, in sequence, electrical pulses (19) to open said valves upon application of the pulse, the duration of a pulse determining the opening period of said valves (11), and a signaling circuit comprising a pair of windings (51, 58), one of the windings (51) being coupled to one of the spark plug wires (49) and the other of the windings (58) being coupled to the coil-distributor wire (48) of the ignition system having a pulse appearing there on for each firing of a spark plug of the engine the output of said signaling circuit being coupled to said pulse generating and connection means (20, 56) to control the distribution of the pulse to the valves.
Claim 3
Dependent Claim
34 words
System in accordance with claim 1, wherein (FIG. 1) the signaling circuit comprises a toroidal ferrite core (52), the wire carrying ignition passing through the core; and a winding (51) wound on the core.
Claim 4
Dependent Claim
29 words
System in accordance with claim 1, including rectifier means (61, 62) interconnecting said windings, said rectifier means being oppositely poled to provide mutually blocking rectified potentials from said windings.
Claim 5
Dependent Claim
57 words
System in accordance with claim 1, comprising a ring counter (55) having a count output corresponding to the number of cylinders and then resetting, the output of the other of said windings (58) being applied to said ring counter; the output of the first of said windings (49) being connected to the counter to synchronize the counter.
Claim 6
Dependent Claim
67 words
System in accordance with claim 4, wherein said first winding (51) is coupld to a specific one of the ignition wires (49) of the engine corresponding to a specific cylinder in a specific firing order; and said winding (51) is connected To the counter at a stage having a count which is representative of the specific one of the fuel injection valves associated with said specific cylinder.
Claim 7
Dependent Claim
19 words
System in accordance with claim 4, including a trigger circuit (38) interposed between the signaling circuit and the counter.
Claim 8
Dependent Claim
52 words
System in accordance with claim 6, wherein the triggering circuit comprises a switching transistor (84), a voltage divider, the tap point of which is connected to the base of the switching transistor, and a condenser (89) connected across the voltage divider; and a diode (87) interconnecting the signaling circuit and the counter.
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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |