US5502966A
Expired / Lapsed
US
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Protection system for a pressure-charged internal combustion engine and method of operation
Assignee: Robert Bosch GmbH
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Filing: 1994-02-23
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Granted: 1996-04-02
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Expires: 2014-02-23
Abstract
Abstract A protection system for a pressure-charged (supercharged) combustion engine. In normal operation, the pressure-charging is controlled and/or regulated to a specifiable desired setpoint value P Setpoint. For the case of over-boosting of the internal combustion engine, various protective measures are provided, which are used in dependence upon the extent of over-boosting. In the case of a first protective measure, the control and/or regulation of the pressure-charging is switched off, and a final controlling element, which influences the pressure-charging, is adjusted to a predeterminable position. In the case of a second protective measure, the fuel metering to individual cylinders is interrupted in accordance with a predetermined skip pattern. If it is not possible to achieve an adequate reduction in the pressure-charging by this means, the system switches successively to further skip patterns with a higher skip frequency.
Inventors
- 👤 Stefan Unland
- 👤 Oskar Torno
- 👤 Werner Haeming
- 👤 Ulrich Rothhaar
- 👤 Iwan Surjadi
- 👤 Wolfgang Hilbert
- 👤 Robert Sloboda
- 👤 Michael Baeuerle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:37
CPC Classifications
F; F02; F02B; F02B39/00; F02B39/16; F02D; F02D33/00; F02D33/02; F02D41/00; F02D41/0002; F02D41/0007; F02D41/22; F02D41/221; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y02T10/40
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
195 words
A protection system for a supercharged internal combustion engine, comprising: a control unit for controlling a supercharging of the internal combustion engine as a function of a predetermined setpoint value, P setpoint , when the internal combustion engine is in a normal operating condition, intervening in the controlling of the supercharging of the internal combustion engine when the internal combustion engine is in a first stage of an over-boosting condition, controlling a metering of fuel into the internal combustion engine when the internal combustion engine is in a second stage of the over-boosting condition, wherein the controlling of the metering of fuel includes skipping the metering of fuel to a predetermined cylinder of the internal combustion engine as a function of at least one predetermined skip pattern, a first predetermined skip pattern having a first skip frequency being activated when the internal combustion engine achieves the second stage of the over-boosting condition and a second predetermined skip pattern having a second skip frequency being activated when a signal determined as a function of the supercharging of the internal combustion engine indicates a predetermined condition, the second skip frequency being higher than the first skip frequency.
Claim 2
Dependent Claim
195 words
A protection system for a supercharged internal combustion engine, comprising: a control unit for controlling a supercharging of the internal combustion engine as a function of a predetermined setpoint value, P setpoint , when the internal combustion engine is in a normal operating condition, intervening in the controlling of the supercharging of the internal combustion engine when the internal combustion engine is in a first stage of an over-boosting condition, controlling a metering of fuel into the internal combustion engine when the internal combustion engine is in a second stage of the over-boosting condition, wherein the controlling of the metering of fuel includes skipping the metering of fuel to a predetermined cylinder of the internal combustion engine as a function of at least one predetermined skip pattern, a first predetermined skip pattern having a first skip frequency being activated when the internal combustion engine achieves the second stage of the over-boosting condition and a second predetermined skip pattern having a second skip frequency being activated when a signal determined as a function of the supercharging of the internal combustion engine indicates a predetermined condition, the second skip frequency being higher than the first skip frequency.
Claim 3
Independent Claim
195 words
A method for protecting a supercharged internal combustion engine, comprising the steps of: controlling a supercharging of the internal combustion engine as a function of a predetermined setpoint value, P setpoint , when the internal combustion engine is in a normal operating condition; intervening in the controlling of the supercharging of the internal combustion engine when the internal combustion engine is in a first stage of an over-boosting condition; controlling a metering of fuel into the internal combustion engine when the internal combustion engine is in a second stage of the over-boosting condition; wherein the step of controlling the metering of fuel includes skipping the metering of fuel to a predetermined cylinder of the internal combustion engine as a function of at least one predetermined skip pattern, a first predetermined skip pattern having a first skip frequency being activated when the internal combustion engine achieves the second stage of the over-boosting condition and a second predetermined skip pattern having a second skip frequency being activated when a signal determined as a function of the supercharging of the internal combustion engine indicates a predetermined condition, the second skip frequency being higher than the first skip frequency.
Claim 4
Independent Claim
195 words
A method for protecting a supercharged internal combustion engine, comprising the steps of: controlling a supercharging of the internal combustion engine as a function of a predetermined setpoint value, P setpoint , when the internal combustion engine is in a normal operating condition; intervening in the controlling of the supercharging of the internal combustion engine when the internal combustion engine is in a first stage of an over-boosting condition; controlling a metering of fuel into the internal combustion engine when the internal combustion engine is in a second stage of the over-boosting condition; wherein the step of controlling the metering of fuel includes skipping the metering of fuel to a predetermined cylinder of the internal combustion engine as a function of at least one predetermined skip pattern, a first predetermined skip pattern having a first skip frequency being activated when the internal combustion engine achieves the second stage of the over-boosting condition and a second predetermined skip pattern having a second skip frequency being activated when a signal determined as a function of the supercharging of the internal combustion engine indicates a predetermined condition, the second skip frequency being higher than the first skip frequency.
Claim 5
Dependent Claim
91 words
The method according to claim 2, wherein the first stage of the over-boosting condition includes when the signal determined as a function of the supercharging of the internal combustion engine exceeds a first threshold value, P 1 , for a first predetermined period of time, t 1 Max, and wherein the second stage of the over-boosting condition includes when the signal determined as a function of the supercharging of the internal combustion engine exceeds a second threshold value, P 2 , for a second predetermined period of time, t 2 Max.
Claim 6
Dependent Claim
36 words
The method according to claim 3, wherein the normal condition includes when the signal determined as a function of the supercharging of the internal combustion engine is less than the first threshold value, P 1 .
Claim 7
Dependent Claim
54 words
The method according to claim 3, wherein the internal combustion engine is in one of the first stage and the second stage of the over-boosting condition only when a sensor for detecting the signal determined as a function of the supercharging of the internal combustion engine is determined to be in an operative condition.
Claim 8
Dependent Claim
53 words
The method according to claim 2, wherein the step of intervening in the controlling of the supercharging of the internal combustion engine includes switching off the supercharging of the internal combustion engine and adjusting a controlling element to a predetermined position, wherein the controlling element regulates the supercharging of the internal combustion engine.
Claim 9
Dependent Claim
40 words
The method according to claim 3, wherein the predetermined condition includes when the signal representing the supercharging of the internal combustion engine exceeds the second threshold value, P 2 , after a third predetermined period of time, t 3 Max.
Claim 10
Dependent Claim
67 words
The method according to claim 2, wherein the at least one predetermined skip pattern is determined as a function of a number of cylinders in the internal combustion engine so that each of the number of cylinders is progressively skipped by the at least one predetermined skip pattern and a torque decrease caused by the at least one predetermined skip pattern is less than a predetermined amount.
Claim 11
Independent Claim
105 words
The method according to 3, wherein the step of intervening in the controlling of the supercharging of the internal combustion engine includes canceling the intervening in the controlling of the supercharging of the internal combustion engine immediately after the signal determined as a function of the supercharging of the internal combustion engine drops below the first threshold value P 1 , and wherein the step of controlling the metering of fuel includes canceling the controlling of the metering of fuel immediately after the signal determined as a function of the supercharging of the internal combustion engine drops below the second threshold value P 2 .
Claim 12
Independent Claim
105 words
The method according to 3, wherein the step of intervening in the controlling of the supercharging of the internal combustion engine includes canceling the intervening in the controlling of the supercharging of the internal combustion engine immediately after the signal determined as a function of the supercharging of the internal combustion engine drops below the first threshold value P 1 , and wherein the step of controlling the metering of fuel includes canceling the controlling of the metering of fuel immediately after the signal determined as a function of the supercharging of the internal combustion engine drops below the second threshold value P 2 .
Claim 13
Dependent Claim
49 words
The method according to claim 3, wherein the second threshold value P 2 is generated by a characteristic map that determines the second threshold value P 2 as a function of a speed of the internal combustion engine and a temperature of inducted air of the internal combustion engine.
Claim 14
Dependent Claim
49 words
The method according to claim 3, wherein the second threshold value P 2 is generated by a mathematical algorithm that determines the second threshold value P 2 as a function of a speed of the internal combustion engine and a temperature of inducted air of the internal combustion engine.
Claim 15
Dependent Claim
28 words
The method according to claim 3, wherein the first threshold value P 1 is determined by subtracting a predetermined value from the second threshold value P 2 .
Claim 16
Dependent Claim
35 words
The method according to claim 3, wherein the signal determined as a function of the supercharging of the internal combustion engine represents one of a boost pressure, an air mass and an air flow rate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-04-02 | 1999-10-02 | 2000-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-04-02 | 2003-10-02 | 2004-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-04-02 | 2007-10-02 | 2008-04-02 | $7700.00 | Window Closed / Lapsed |