EP0238144A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Device for the governing of the supercharging pressure of an internal combustion engine
Assignee: Fiat Auto SpA
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Filing: 1987-03-16
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Granted: —
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Expires: 2007-03-16
Abstract
Abstract The device allows the physical quantity used for the feedback-governing of the supercharging pressure of an internal combustion engine to be corrected as a function of ambient air temperature.
Inventors
- 👤 Angelo Ciccarone
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 19:12
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/0002; F02D41/0007; F02D2200/00; F02D2200/02; F02D2200/04; F02D2200/0414; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
313 words
Device for the governing of the pressure of supercharging air of an internal combustion engine, provided with at least one feed duct inside which a turbo-blower and at least one throttle valve are provided, and with at least one exhaust duct inside which a turbine is provided, which drives the turbo-blower, the device comprising first valve means for the exhaust of a fluid which has an influence on the pressure of supercharging air, an actuator of said first valve means, sensors of preselected engine parameter, among which the ambient air temperature, second valve means operatively connected with said actuator, a programmed microcomputer, in the permanent memory of which stored are the computation programs relating to the algorithms of governing of the supercharging pressure, the tables of the data of the energizing times and of the rest times of the said second valve means memorized as a function of a couple of preselected engine parameters, and the tables of data of the physical quantity of feedback-control, always memorized as a function of the above said couple of preselected engine parameters, the microcomputer being programmed for determining the excitation times and the rest times of said second valve means on the basis of the present values of the engine parameters coming from the above-said sensors, and for determining the value of the feedback-control quantity on the basis of the same present values of the engine parameters, characterized in that in microcomputer's memory also stored are correction coefficients as a function of ambient air temperature and that the microcomputer is programmed to multiply said correction coefficients by the computed value of the above-said control quantity, to verify whether the corrected value coincides or less with the present value supplied by the relevant sensor and, in case of difference, to command changes in the energizing times and in the rest times of the above-said second valve means.
Claim 2
Dependent Claim
313 words
Device for the governing of the pressure of supercharging air of an internal combustion engine, provided with at least one feed duct inside which a turbo-blower and at least one throttle valve are provided, and with at least one exhaust duct inside which a turbine is provided, which drives the turbo-blower, the device comprising first valve means for the exhaust of a fluid which has an influence on the pressure of supercharging air, an actuator of said first valve means, sensors of preselected engine parameter, among which the ambient air temperature, second valve means operatively connected with said actuator, a programmed microcomputer, in the permanent memory of which stored are the computation programs relating to the algorithms of governing of the supercharging pressure, the tables of the data of the energizing times and of the rest times of the said second valve means memorized as a function of a couple of preselected engine parameters, and the tables of data of the physical quantity of feedback-control, always memorized as a function of the above said couple of preselected engine parameters, the microcomputer being programmed for determining the excitation times and the rest times of said second valve means on the basis of the present values of the engine parameters coming from the above-said sensors, and for determining the value of the feedback-control quantity on the basis of the same present values of the engine parameters, characterized in that in microcomputer's memory also stored are correction coefficients as a function of ambient air temperature and that the microcomputer is programmed to multiply said correction coefficients by the computed value of the above-said control quantity, to verify whether the corrected value coincides or less with the present value supplied by the relevant sensor and, in case of difference, to command changes in the energizing times and in the rest times of the above-said second valve means.
Claim 3
Dependent Claim
105 words
Device according to claim 1, characterized in that the above-said first valve means are constituted by a valve provided inside a by-pass (short-circuit) valve for bypassing the duct inside which the turbine is provided and that its actuator is of the membrane type, on the faces of which on one side the atmospheric pressure and the load of a spring, and on the other side the air pressure at turbo-blower delivery or intake are active, furthermore characterized in that said second valve means are constituted by a three-way electrovalve, able to connect one face of said membrane selectively with the turbo-blower delivery and turbo-blower intake.
Claim 4
Dependent Claim
58 words
Device according to claim 1, characterized in that it is provided with sensors of engine revolution rate, throttle valve(s) angle and flowrate of air intaken by the engine, in the permanent memory of the microcomputer, as the data of feedback control, the values of air flowrate as a function of engine revolution rate and throttle valve(s) being stored.
References Cited (Backward Citations)
No citation records indexed.
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