Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means
Patent
1994-11-21
1996-07-09
Nelli, Raymond A.
Internal-combustion engines
Charge forming device
Including exhaust gas condition responsive means
F02D 4100
Patent
active
055334911
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention proceeds from a control system for the metering of fuel to an internal combustion engine. A method as well as an arrangement for operating a fuel supply arrangement having a lambda control is known from U.S. Pat. No. 4,357,922. There, the lambda control is switched on when, in addition to the operational readiness of the probe, a specific engine temperature has been reached. The magnitude of this temperature is listed as "preferably 50.degree. to 85.degree.". Furthermore, U.S. Pat. No. 4,392,470 discloses a control arrangement for the composition of the operating mixture which enters the internal combustion engine for combustion. This document teaches that the lambda control is switched on for two different exhaust gas temperatures, namely, in dependence upon whether there is an idle state or not.
It has been shown that these known methods cannot operate optimally in all operating states. It is therefore an object of the invention to provide, based on this state of the art, a control system for metering fuel to an internal combustion engine which, above all, provides a greater flexibility in comparison to the methods known up to now.
SUMMARY OF THE INVENTION
The control system according to the invention affords the advantage compared to the known systems that, in the context of an optimization for good driving performance of the engine, the lambda control is switched on at a very early time point and therefore the emission of toxic substances is further reduced.
BRIEF DESCRIPTION OF THE DRAWINGS
An embodiment of the invention (with alternate solutions) is shown in the drawing and is described in greater detail in the following. FIG. 1 shows an overview diagram of a control system of an internal combustion engine. FIG. 2 shows a flowchart for determining the switch-on point of the lambda control. FIG. 3 shows an example of values in combination with the flowchart of FIG. 2.
DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE INVENTION
FIG. 1 shows, in the context of an overview diagram, the system components and engine variables which are essential in combination with the present invention. The internal combustion engine itself is identified by reference numeral 10, its intake pipe by 11 and its exhaust gas pipe by 12. The following are disposed one behind the other in the flow direction in the intake pipe: an air mass or air quantity sensor 14, a throttle flap 15 and an injection valve 16. A lambda probe 18 is mounted in the exhaust gas pipe. The lambda probe 18 reacts to the presence of oxygen in the exhaust gas in a manner known per se after it reaches its operating temperature. Additionally, an exhaust gas temperature sensor 25 can be mounted in the exhaust gas pipe.
A rpm sensor 19 and a temperature sensor 20 are provided for the internal combustion engine 10. A control apparatus 22 receives input signals from the following: a throttle flap sensor 24 which is operatively connected to the throttle flap 15; the air quantity sensor 14; the lambda probe 18; the exhaust gas temperature sensor which can be provided as an option; and, the two sensors 19 and 20 for rpm and the temperature TMot of the internal combustion engine. The exhaust gas temperature as well as the temperature of the catalytic converter can also be computed within the control apparatus as a model from other engine variables of the engine. The control apparatus 22 provides at least the following at its output end: an injection signal for the injection valves 16 of which there is at least one and ignition signals for the spark plugs of the engine which are not specifically shown.
The structure of a control system shown in FIG. 1 is known for an internal combustion engine as is its operation. The control apparatus 22 forms pulsewidth modulated signals for the at least one injection valve 16 as well as the ignition signals for the individual spark plugs. These pulsewidth modulated signals are formed in dependence upon load and rpm as well as additional engine variables such as engine temperature
REFERENCES:
patent: 3918257 (1975-11-01), Hirose et al.
patent: 4357922 (1982-11-01), Rosenzopf et al.
patent: 4392470 (1983-07-01), Gunther et al.
patent: 4437445 (1984-03-01), Takahashi et al.
patent: 4879986 (1989-11-01), Sakamoto
patent: 4930480 (1990-06-01), Noyori
patent: 5131371 (1992-07-01), Wahl et al.
Gras Jurgen
Hertzler Siegfried
Tjoa Jan-Tian
Nelli Raymond A.
Ottesen Walter
Robert & Bosch GmbH
LandOfFree
Control system for metering fuel to an internal combustion engin does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Control system for metering fuel to an internal combustion engin, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Control system for metering fuel to an internal combustion engin will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1860659