US4587939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety device for a microcomputer controlled internal combustion
Assignee: Robert Bosch GmbH
•
Filing: 1984-10-25
•
Granted: 1986-05-13
•
Expires: 2004-10-25
Abstract
Abstract A safety device for a controlling unit of an internal combustion engine controlled by a microcomputer includes the following circuits: (a) a source of stabilized voltage which may be subject to fluctuations; (b) a first monitoring circuit responsive to voltage breaks in the voltage source to block the controlling unit for the duration of respective voltage breaks; (c) a second monitoring circuit responsive to the operability of the microcomputer to block the controlling unit for the duration of the resetting time of the microcomputer when a non-operative condition of the microcomputer is detected.
Inventors
- 👤 Herman Hemminger
- 👤 Werner Jundt
- 👤 Sybille Weller
- 👤 Peter Werner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:35
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/30; F02D41/3005; F02D41/24; F02D41/26; F02D41/266; F02D41/22; F02D2041/224; F02D2041/226; F02D2200/00; F02D2200/50; F02D2200/503; F02D2250/00; F02D2250/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
112 words
A safety device for a controlling unit of a fuel injection system of an internal combustion engine controlled or regulated by a micro-computer, comprising a voltage source for the microcomputer and its peripheral devices; a first monitoring means responsive to voltage breaks in said voltage source to produce a first signal applied to said controlling unit for adjusting the same to a safety position while the microcomputer remains operative; and a second monitoring means responsive to the operability of the microcomputer to produce a second signal applied to said controlling unit for adjusting the same to said safety position when a non-operative condition of the microcomputer caused by voltage fluctuations is detected.
Claim 2
Dependent Claim
112 words
A safety device for a controlling unit of a fuel injection system of an internal combustion engine controlled or regulated by a micro-computer, comprising a voltage source for the microcomputer and its peripheral devices; a first monitoring means responsive to voltage breaks in said voltage source to produce a first signal applied to said controlling unit for adjusting the same to a safety position while the microcomputer remains operative; and a second monitoring means responsive to the operability of the microcomputer to produce a second signal applied to said controlling unit for adjusting the same to said safety position when a non-operative condition of the microcomputer caused by voltage fluctuations is detected.
Claim 3
Dependent Claim
24 words
A safety device as defined in claim 1, wherein said controlling unit is an end stage of a fuel injection system of the engine.
Claim 4
Dependent Claim
28 words
A safety device as defined in claim 2, wherein said first monitoring means adjusts the safety position of the controlling unit for the duration of respective voltage breaks.
Claim 5
Dependent Claim
41 words
A safety device as defined in claim 3, wherein the second monitoring means, after dropping of the source voltage below a level at which the microcomputer becomes inoperative, adjusts the safety position of the controlling unit for a predetermined time interval.
Claim 6
Dependent Claim
30 words
A safety device as defined in claim 4, wherein the first and second signals from respective monitoring means control the safety position of the controlling unit via an OR logic.
Claim 7
Dependent Claim
37 words
A safety device as defined in claim 4, wherein the microcomputer has a voltage monitoring terminal connected to the second monitoring means, and a reset input connected to the second monitoring means for receiving said second signal.
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) | 1989-05-12 | 1989-11-11 | 1990-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-12 | 1993-11-11 | 1994-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-12 | 1997-11-11 | 1998-05-13 | $7700.00 | Window Closed / Lapsed |