Internal-combustion engines – Engine speed regulator – Open loop condition responsive
Patent
1993-02-18
1994-05-10
Kamen, Noah P.
Internal-combustion engines
Engine speed regulator
Open loop condition responsive
123 52MB, 123479, F02D 700, F02M 5100
Patent
active
053098838
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a method for operating an internal combustion engine, especially in a motor vehicle.
To enable efficient operation of internal combustion engines with as little pollution as possible, especially in motor vehicles, their control sophistication is being continuously increased. Thus, among other things, ignition control and fuel metering are becoming more and more complicated and the induction systems are being improved. It is known by DE-A-35 29 388, for example, that to achieve good filling of the combustion chambers over the rpm range of the internal combustion engine, an induction manifold can be provided, in which--in the lower rpm and load range--long induction pipes (tuned induction pressure charging [resonance mode]) and--in the upper rpm range--short induction pipes take effect with an increased induction volume. Switching over in the form of throttle valves generally takes place depending on rpm and/or depending on induction pipe pressure. However, it is of decisive importance that these measures for improving the power and efficiency with favorable pollutant values interact without problems.
In addition, by virtue of DE-A-39 04 412, an induction system is known with an air flow rate and--associated with it--fuel metering, on the one hand, which are controlled via a main throttle valve, and in the idle range are controlled via a bypass system which bypasses the main throttle valve. There is a memory which stores a numerous reference values of the pressure in the induction area which are derived in agreement with the engine rpm and the degree of opening of the throttle valve. Furthermore, there is a pressure transducer for sampling the pressure in the induction port, and an engine rpm sensor. A throttle valve position transducer samples the degree of opening of the throttle valve; another position transducer determines the degree of opening of the valve in the bypass. To monitor the systems, there are comparator means which compare the pressure value measured by the pressure transducer to a reference pressure derived from the memory and which deliver an error signal when the sampled pressure does not match the computed reference pressure. The error signal can thus lead, for example, to cutoff of fuel feed.
SUMMARY OF THE INVENTION
The object of the invention is to demonstrate a method of the generic type with which faults in the switching-over of the efficient induction areas can be recognized, and (if necessary) at least partially offset.
According to the invention, it is therefore proposed that the switching function of the induction manifold be monitored, and, in case of maladjustment of the switching means, measures be initiated. In the simplest case these measures can be the triggering of a warning display which indicates to the operator that the internal combustion engine is not operating in a regular and proper manner. However the measures can preferably be the triggering of a error memory from which, for example, the type of problem and (if necessary) its duration can be retrieved in a service station by readout of the error memory. Alternatively or in addition to this, in the course of control of the internal combustion engine, for example by ignition intervention (shifting of the ignition point), or by intervention in the fuel metering or in the exhaust gas recirculation, measures can be initiated which compensate for the adverse effects on engine operation and/or exhaust gas emissions caused by maladjustment of the switching means.
Electrical (potentiometer) or electromechanical position sensors which deliver a fault signal when the switching means are maladjusted can be placed on the switching means of the induction manifold.
In a preferred embodiment, the combustion air flow rate or capacity of the internal combustion engine is used as the monitored parameter. In doing so, it must be taken into account that (for example) for fuel metering, the capacity of the internal combustion engine is computed anyway, so that the control sophis
REFERENCES:
patent: 4722307 (1988-02-01), Okuno et al.
patent: 4903526 (1990-02-01), Miyama et al.
patent: 5014673 (1991-05-01), Fujimoto et al.
patent: 5027769 (1991-07-01), Yoshida et al.
patent: 5105774 (1992-04-01), Piccini
patent: 5233958 (1993-08-01), Knoss et al.
Audi AG
Kamen Noah P.
Solis Erick
LandOfFree
Method for operating an internal combustion engine does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for operating an internal combustion engine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for operating an internal combustion engine will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2408649