Patent US3916865A successfully refreshed from Google Patents.
US3916865A
Expired / Lapsed
US
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Electronic governor for internal combustion engine
Assignee: Robert Bosch GmbH
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Filing: 1974-06-12
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Granted: 1975-11-04
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Expires: 1994-06-12
Abstract
Abstract To provide for speed governing of internal combustion engines having an electronic fuel control, typically an electronic fuel injection system in which the pulse duration of generated injection control pulses determines the amount of fuel being supplied, in a given time, to the engine, a pulse source generates a series of pulses at a frequency determinative of maximum speed of the engine. This frequency is compared with a frequency representative of actual engine speed and, when the actual speed frequency exceeds the maximum generated speed frequency, a switch (typically a flip-flop) is controlled to change state, the switch being connected to interrupt fuel injection pulses, thereby cutting fuel from the engine. Preferably, the comparator includes an EXCLUSIVE OR-gate.
Inventors
- 👤 Uwe Kiencke
- 👤 Martin Zechnall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:54
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/0205
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
182 words
Governor arrangement for an internal combustion engine, having an electronic control system including a digital circuit providing fuel supply and fuel termination signals to the engine, and means (41) providing a speed signal (f3) having a frequency proportional to engine speed, said governor arrangement comprising means (62a) providing a reference signal frequEncy proportional to maximum permissible governed engine speed; comparator means (98a) having said speed signal (f3) and said reference signal (fr) applied thereto and providing an output signal when the frequency of the speed signal exceeds the frequency of the reference signal; a digital switch (152) connected to control termination of fuel supply to the engine when controlled to change state, the output signal from said comparator means (98a) being connected to the digital switch to cause said switch to change state when said output signal from the comparator means is generated; and pulse scanning or strobing circuits (97, 97a) connected to said speed signal generating means (41) and said reference signal generating means (62a), respectively, and equalizing the pulse durations of the signals provided by said respective signal generating means.
Claim 2
Dependent Claim
182 words
Governor arrangement for an internal combustion engine, having an electronic control system including a digital circuit providing fuel supply and fuel termination signals to the engine, and means (41) providing a speed signal (f3) having a frequency proportional to engine speed, said governor arrangement comprising means (62a) providing a reference signal frequEncy proportional to maximum permissible governed engine speed; comparator means (98a) having said speed signal (f3) and said reference signal (fr) applied thereto and providing an output signal when the frequency of the speed signal exceeds the frequency of the reference signal; a digital switch (152) connected to control termination of fuel supply to the engine when controlled to change state, the output signal from said comparator means (98a) being connected to the digital switch to cause said switch to change state when said output signal from the comparator means is generated; and pulse scanning or strobing circuits (97, 97a) connected to said speed signal generating means (41) and said reference signal generating means (62a), respectively, and equalizing the pulse durations of the signals provided by said respective signal generating means.
Claim 3
Dependent Claim
58 words
Arrangement according to claim 1, wherein the fuel control comprises a fuel injection system (153, 32) in which the duration of the fuel injection pulses determines the amount of fuel being applied to the engine, said duration being defined when said switch changes to one (set) state and terminating when said switch changes to the other (re-set) state.
Claim 4
Dependent Claim
18 words
Arrangement according to claim 1, wherein the comparator means (98a) comprises a comparator stage including an EXCLUSIVE OR-gate.
Claim 5
Dependent Claim
32 words
Arrangement according to claim 1, wherein the comparator means comprises an EXCLUSIVE OR-gate having two inputs, one input, each, being connected to the output of a respective pulse scanning or strobing circuit.
Claim 6
Dependent Claim
88 words
Arrangement according to claim 1, wherein at least one of the pulse scanning or strobing circuits (97, 97a) comprises two D-flip-flops (167, 170; 172a, 172); a strobe pulse source (168, 169) connected to the clock inputs of both the flip-flops; the D input of the first D-FF (167, 172a) having the input frequency applied thereto; and a NAND-gate (171, 173) having its inputs connected to the output of the first D-flip-flop (167, 172a) and the further input connected to the inverse output of the second D-flip-flop (170, 172).
Claim 7
Dependent Claim
13 words
Arrangement according to claim 1, wherein said digital switch comprises a JK-flip-flop (152).
Claim 8
Dependent Claim
115 words
Arrangement according to claim 1, wherein the electronic control system provides a control pulse defining termination of fuel supply, at a given instant of time (terminal 301); means (300) connecting said ''''terminate'''' pulse to said digital switch to control said digital switch to terminate fuel supply to the engine; and wherein the output signal from said comparator means (98a) is connected to said connection means (300) to provide a signal to said digital switch and cause said digital switch to change state and terminate fuel supply to the engine at the instant of generation of the output signal from said comparator means and regardless of presence of a terminate pulse from said electronic control system.
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) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |