US3620196A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for applying fuel injection corrections as a function of speed, in internal combustion engines
Assignee: Robert Bosch GmbH
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Filing: 1970-08-28
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Granted: 1971-11-16
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Expires: 1990-08-28
Abstract
Abstract An arrangement by which corrections are applied to the pulses which open electromagnetically controlled valves for fuel injection in internal combustion engines. The opening pulses for the valves are generated by a monostable multivibrator to which a control voltage is applied. The multivibrator emits substantially rectangular-shaped pulses, the durations of which are controlled as a function of speed of the engine, through the control voltage. The control voltage has characteristics variable periodically in synchronism with the pulses provided by the monostable multivibrator. A storage capacitor integrates the control voltage, and charging sources connected to the capacitor have different internal resistances. The charging sources are switched and connected to the capacitor in predetermined sequence.
Inventors
- 👤 Wolf Wessel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:40
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/30; F02D41/32
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
147 words
A fuel injection control arrangement for an internal combustion engine comprising, in combination, electromagnetically controlled fuel injection valve means; monostable multivibrator means connected to said valve means and applying pulse signals to said valve means, the duration of said pulse signals determining opening time interval of said valve means; control voltagegenerating means connected to said monostable multivibrator means for generating a control voltage to vary said duration of said pulse signals as a function of the speed of said engine, said control voltage having a characteristics variable periodically in synchronism with said pulse signals; storage capacitor means in said control voltage-generating means for integrating said control voltage as a a function of time; at least two charging sources connected to said capacitor means and having different internal resistances; and switching means connected to said charging sources for connecting said sources in predetermined sequence to said capacitor means.
Claim 2
Dependent Claim
147 words
A fuel injection control arrangement for an internal combustion engine comprising, in combination, electromagnetically controlled fuel injection valve means; monostable multivibrator means connected to said valve means and applying pulse signals to said valve means, the duration of said pulse signals determining opening time interval of said valve means; control voltagegenerating means connected to said monostable multivibrator means for generating a control voltage to vary said duration of said pulse signals as a function of the speed of said engine, said control voltage having a characteristics variable periodically in synchronism with said pulse signals; storage capacitor means in said control voltage-generating means for integrating said control voltage as a a function of time; at least two charging sources connected to said capacitor means and having different internal resistances; and switching means connected to said charging sources for connecting said sources in predetermined sequence to said capacitor means.
Claim 3
Dependent Claim
20 words
The arrangement as defined in claim 1, wherein said monostable multivibrator means has an input transistor and an output transistor.
Claim 4
Dependent Claim
14 words
The arrangement as defined in claim 1, wherein said pulse signals are rectangular-shaped pulses.
Claim 5
Dependent Claim
38 words
The arrangement as defined in claim 1, wherein said switching means disconnects in sequence from said capacitor means the source previously connected to said capacitor means upon connecting to said capacitor means the subsequent one of said sources.
Claim 6
Dependent Claim
19 words
The arrangement as defined in claim 1 including a diode connected between each source and said storage capacitor means.
Claim 7
Dependent Claim
34 words
The arrangement as defined in claim 5 including discharge means connected to said storage capacitor means and comprising a discharge diode; and a transistor with emitter-collector path connected in series with said discharge diode.
Claim 8
Dependent Claim
53 words
The arrangement as defined in claim 6 including voltage limiting means connected to said storage capacitor means for limiting the voltage across said capacitor means, said voltage-limiting means comprising a clipping diode; voltage-dividing means connected to said clipping diode and cooperating with said diode for limiting the charging voltage of said capacitOr means.
Claim 9
Dependent Claim
76 words
The arrangement as defined in claim 7 including a first auxiliary diode connected between said capacitor means and said clipping diode; resistor means connected to the junction of said clipping diode and said first auxiliary diode for limiting the charging current to said capacitor means; second voltage-dividing means connected to said resistor means and applying to said resistor means a voltage greater than the voltage applied by said first-mentioned voltage dividing means to said clipping diode.
Claim 10
Dependent Claim
64 words
The arrangement as defined in claim 5 including a first auxiliary resistor and a second auxiliary resistor connected in series, said series connected auxiliary resistors being connected to the collector of said transistor, the junction of said first and second auxiliary resistors being connected to said discharge diode so that the discharge rate of said capacitor means is determined by said second auxiliary resistor.
Claim 11
Dependent Claim
36 words
The arrangement as defined in claim 1, wherein at least of said charging sources comprises a transistor; a diode connected to said transistor and said charging capacitor means; and coupling capacitor means connected to said transistor.
Claim 12
Dependent Claim
23 words
The arrangement as defined in claim 10, wherein said diode is connected between said coupling capacitor means and the collector of said transistor.
Claim 13
Dependent Claim
45 words
The arrangement as defined in claim 10, including a first resistor and a second resistor connected in series and to the collector of said transistor; and a third resistor connected in series with said diode and to the junction of said first and second resistors.
Claim 14
Dependent Claim
30 words
The arrangement as defined in claim 12 including voltage-dividing means; and a first auxiliary diode connected between the junction of said third resistor and said diode and said voltage-dividing means.
Claim 15
Dependent Claim
29 words
The arrangement as defined in claim 13 including an auxiliary transistor; and a coupling capacitor connected between the base of said auxiliary transistor and the collector of said transistor.
Claim 16
Dependent Claim
109 words
The arrangement as defined in claim 14 including a second auxiliary diode connected between said auxiliary transistor and said storage capacitor means; and a third auxiliary diode with anode connected to the anode of said second auxiliary diode, the cathode of said third auxiliary diode being connected to the collector of said transistor. 16 The arrangement as defined in claim 1 including a transistor emitter-follower with base connected to said storage capacitor means, the emitter of said emitter follower being connected to said monostable multivibrator at a circuit junction where the potential influences the end of the unstable state of said multivibrator and the ends of said pulse signals.
Claim 17
Dependent Claim
30 words
The arrangement as defined in claim 16 including a source of operating voltage; and a first resistor connected between the emitter of said emitter-follower and said source of operating voltage.
Claim 18
Dependent Claim
24 words
The arrangement as defined in claim 16 including a resistor connected between the emitter of said emitter-follower and said circuit junction in said multivibrator.
Claim 19
Dependent Claim
47 words
The arrangement as defined in claim 1, wherein said storage capacitor means comprises two storage capacitors; and a diode connected between said two storage capacitors for the coupling said storage capacitors, the storage capacitor having the more positive voltage being operative and the other capacitor being inoperative.
Claim 20
Dependent Claim
17 words
The arrangement as defined in claim 19, including an emitter-follower transistor with base connected to said diode.
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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |