US3593692A
Expired / Lapsed
US
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Electrical fuel injection arrangement for internal combustion engines
Assignee: Robert Bosch GmbH
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Filing: 1969-05-09
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Granted: 1971-07-20
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Expires: 1989-05-09
Abstract
Abstract An electrically controlled fuel injection arrangement for internal combustion engines in which the fuel is injected through electromagnetically controlled valves. A control monostable multivibrator is actuated through a pulse emitter coupled directly to the crankshaft of the engine and emitting pulses synchronously with the speed of the engine. The pulse emitter actuates the monostable multivibrator which has a variable unstable state. A pulse generator coupled to the throttle of the engine emits a sequence of auxiliary control signals which extend the opening time interval of the injection valves during opening motion of the throttle, for purposes of increasing the quantity of injected fuel during engine acceleration.
Inventors
- 👤 Hermann Scholl
- 👤 Norbert Rittmannsberger
- 👤 Wolf Wessel
- 👤 Wolfgang Rehmann
- 👤 Josef Wahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:42
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/30; F02D41/32
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
172 words
An electrically controlled fuel injection arrangement for an internal combustion engine comprising, in combination, at least one electromagnetically controlled injection valve for injecting fuel into the engine; energizing means connected to said valve for energizing electrically said injection valve; control multivibrator means having stable and unstable states and being connected to said energizing means; first pulse-emitting means connected to said control multivibrator means and emitting speeddependent pulses proportional to the speed of said engine, varying in frequency upon speed variations of said engine, said pUlses triggering said multivibrator means to said unstable state for opening said valve, said multivibrator means returning to said stable state after a predetermined and variable time interval; and second pulse-emitting means triggered by means actuated primarily during increased demand for power output from said engine, and emitting at least one auxiliary pulse between two successive speed-dependent pulses from said first pulseemitting means, said auxiliary pulse being applied to said injection valve for increasing the quantity of fuel injected during increased demand for power output from the engine.
Claim 2
Dependent Claim
172 words
An electrically controlled fuel injection arrangement for an internal combustion engine comprising, in combination, at least one electromagnetically controlled injection valve for injecting fuel into the engine; energizing means connected to said valve for energizing electrically said injection valve; control multivibrator means having stable and unstable states and being connected to said energizing means; first pulse-emitting means connected to said control multivibrator means and emitting speeddependent pulses proportional to the speed of said engine, varying in frequency upon speed variations of said engine, said pUlses triggering said multivibrator means to said unstable state for opening said valve, said multivibrator means returning to said stable state after a predetermined and variable time interval; and second pulse-emitting means triggered by means actuated primarily during increased demand for power output from said engine, and emitting at least one auxiliary pulse between two successive speed-dependent pulses from said first pulseemitting means, said auxiliary pulse being applied to said injection valve for increasing the quantity of fuel injected during increased demand for power output from the engine.
Claim 3
Dependent Claim
45 words
The fuel injection arrangement as defined in claim 1, wherein said means actuated primarily during increased demand for power output from the engine is the throttle of the engine, said second pulse-emitting means delivering a train of auxiliary pulses during opening motion of said throttle.
Claim 4
Dependent Claim
28 words
The fuel injection arrangement as defined in claim 2, wherein said second pulse-emitting means delivers at least five auxiliary pulses distributed over the total opening of said throttle.
Claim 5
Dependent Claim
66 words
The fuel injection arrangement as defined in claim 1, wherein said means actuated primarily during increased demand for power output from the engine is the throttle of the engine, and said second pulse-emitting means includes switch contact means; and switch element means rotatable by said throttle and cooperating with said switch contact means so that the latter is actuated only during opening motion of said throttle.
Claim 6
Dependent Claim
60 words
The fuel injection arrangement as defined in claim 4, wherein said second pulse-emitting means comprises further a disc member coupled to the shaft of said throttle and having a plurality of teeth distributed along the rim of said disc; and stationary contact members cooperating with said disc and being in contact with said teeth during opening motion of said throttle.
Claim 7
Dependent Claim
53 words
The fuel injection arrangement as defined in claim 4, wherein said second pulse-emitting means comprises further two contact tracks isolated from each other electrically and having radial cross-contact portions directed opposite to the contact portions of the other track; and contact finger means movable with said throttle and contacting said radial cross portions.
Claim 8
Dependent Claim
34 words
The fuel injection arrangement as defined in claim 6 including a third contact track and a second contact finger for maintaining continuous contact with said third contact track during opening motion of said throttle.
Claim 9
Dependent Claim
27 words
The fuel injection arrangement as defined in claim 7 including insulating plate means for carrying said contact finger means and mounted upon the shaft of said throttle.
Claim 10
Dependent Claim
32 words
The fuel injection arrangement as defined in claim 8 including base plate means for carrying said contact tracks; and braking means for holding said base plate means and said insulating plate means.
Claim 11
Dependent Claim
40 words
The fuel injection arrangement as defined in claim 9 including a drag switch mounted on said insulating plate means; and actuating means mounted on the shaft of said throttle and actuating said drag switch during opening motion of said throttle.
Claim 12
Dependent Claim
40 words
The fuel injection arrangement as defined in claim 10 including contact springs extending from said contact fingers and located in the path of said actuating means, each of said contact springs having contact portions at the end of said spring.
Claim 13
Dependent Claim
31 words
The fuel injection arrangement as defined in claim 11 including auxiliary contact springs secured to said base plate means and actuated by said actuating means during closing motion of said throttle.
Claim 14
Dependent Claim
56 words
The fuel injection arrangement as defined in claim 12, including an OR gate means connected to said energizing means and having one input connected to the output of said control multivibrator means; and wherein said second pulse-emitting means includes bistable multivibrator means triggered back and forth between its two states during opening movement of said throttle.
Claim 15
Dependent Claim
40 words
The fuel injection arrangement as defiNed in claim 13, wherein said second pulse-emitting means includes monostable multivibrator means for determining the duration of said auxiliary pulses, and differentiating means connected between said bistable multivibrator means and said monostable multivibrator means.
Claim 16
Dependent Claim
83 words
The fuel injection arrangement as defined in claim 14, wherein said monostable multivibrator means includes an input transistor, said input transistor being conductive when said monostable multivibrator means is quiescent, an output transistor coupled to said input transistor, coupling capacitor means connected between the collector of said output transistor and the base of said input transistor, and a diode connected between the base of said input transistor and said coupling capacitor, said auxiliary pulses being taken from the collector of said input transistor.
Claim 17
Dependent Claim
49 words
The fuel injection arrangement as defined in claim 15, including regulating voltage-generating means for generating a voltage varying as a function of the number of said auxiliary pulses and influencing the duration of the latter, the duration of said auxiliary pulses decreasing with increasing number of said auxiliary pulses.
Claim 18
Dependent Claim
123 words
The fuel injection arrangement as defined in claim 16, wherein said monostable multivibrator means includes an input transistor and an output transistor, a diode connected to the collector of said output transistor, a first resistor connected in series with said diode and having a resistance value substantially within the range of 5 to 50 kohms, a second resistor connected in series with said first resistor and having a resistance value substantially within the range of 100 kohms to 300 kohms, storage capacitor means connected in parallel with said second resistor and having a capacitance of at least 1 Mu ., and feedback coupling capacitor means connected between the base of said input transistor and the junction of said first resistor and said diode.
Claim 19
Dependent Claim
55 words
The fuel injection arrangement as defined in claim 17, including multiplying means connected to said control multivibrator means and applying a lengthening factor to said pulses from said control multivibrator means, said lengthening factor being a function of the number of said auxiliary pulses and being made variable as a function of a charging current.
Claim 20
Dependent Claim
69 words
The fuel injection arrangement as defined in claim 18, including emitter-follower transistor means for providing said charging current; a base capacitor connected to the base of said emitter-follower means; a resistor connected in parallel with said base capacitor, said base capacitor being charged for every one of said auxiliary pulses, the discharge time constant of said capacitor being substantially at least 10 times larger than the charging time constant.
Claim 21
Dependent Claim
37 words
The fuel injection arrangement as defined in claim 19, including electronic storage means for storing said auxiliary pulses, and means for adding to said speed dependent pulses those auxiliary pulses that are overlapped by said speed-dependent pulses.
Claim 22
Dependent Claim
155 words
The fuel injection arrangement as defined in claim 20, wherein said second pulse-emitting means includes monostable multivibrator means controlled by said bistable multivibrator means for generating said auxiliary pulses and having an input transistor and an output transistor, said auxiliary pulses being delivered by said output transistor; a base current transistor for supplying current to the base of the input transistor, said base current transistor being turned off during emission of a speed-dependent pulse by said first pulse-emitting means and being turned on upon termination of said speed-dependent pulse; feedback coupling capacitor means connected between the collector of said output transistor and the base of said input transistor; a diode connected between said feedback coupling capacitor and the base of said input transistor; and an auxiliary feedback circuit connected between the collector of said output transistor and thE base of said input transistor, said auxiliary feedback circuit comprising a resistor and diode connected in series.
References Cited (Backward Citations)
US3051152A
Cited
US3504657A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |