Internal-combustion engines – Accessories – Covers – trays – vibrators – corrosion inhibitors – air filters
Patent
1990-07-26
1991-09-03
Kamen, Noah P.
Internal-combustion engines
Accessories
Covers, trays, vibrators, corrosion inhibitors, air filters
210 85, F02B 7700
Patent
active
050443356
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a monitoring arrangement for a fuel filter. One such monitoring arrangement for a fuel filter is known from U.S. Pat. No. 4,562,431. There, a fuel filter having a water level sensor is described. A warning light is driven from an evaluation electronics when the water level in the fuel filter exceeds a predetermined level. A separate electronics is necessary for the water level sensor and this electronics has no connection whatsoever to other monitoring arrangements or means for controlling or regulating the internal combustion engine.
BACKGROUND OF THE INVENTION
An electronic diesel regulation is described in the "Motortechnische Zeitschrift" 49 (1988), pages 37 to 41. This arrangement regulates or controls different variables such as fuel quantity, rotational speed and injection start in dependence upon various sensor signals. All closed-loop and open-loop functions are monitored. An emergency driving operation is initiated when individual components of the open-loop or closed-loop control become inoperative or defective with the fault being simultaneously stored. In this way, the fault can be easily localized during maintenance work. With this arrangement, faults of individual components of the open-loop or closed-loop control of the internal combustion engine are monitored.
SUMMARY OF THE INVENTION
It is an object of the invention to combine a monitoring arrangement for a fuel filter with an arrangement for electronically controlling a diesel engine. The control arrangement for the internal combustion engine is intended to apply a supply voltage to a residue sensor and monitor the output signal of the sensor.
An arrangement of this kind affords the advantage that no separate control apparatus is needed for the sensor. A plurality of possible reactions to a limited functional capability of the fuel filter is possible by means of this combination. The invention is explained below with respect to the embodiment shown in the drawing.
BRIEF DESCRIPTION OF THE DRAWING
An embodiment of the invention is shown in the drawing and is explained in greater detail in the following description.
DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE INVENTION
The drawing shows a monitoring circuit 100 for a residue sensor 10. The residue sensor 10 is illustrated as a variable resistor in the drawing. The residue sensor is hereinafter referred to as a sensor. The sensor is connected via a connecting node 25 to a series circuit comprising a resistor 20 and a switching unit 70 on the one hand and to a protective circuit 30 on the other hand. The protective circuit 30 and the switching unit 70 are connected to the control unit 40 of the electronic diesel control. The control unit 40 receives various sensor signals characterizing the operational condition of the internal combustion engine and generates at least one open-loop and closed-loop variable R influencing the internal combustion engine. The control unit 40 further applies signals to an indicator device 50 and/or to a diagnostic interface 60.
The sensor 10 is supplied with a supply voltage U.sub.B by a switching unit 70 via a resistor 20. The resistor 20 determines the current flowing through the sensor 10. The current through the sensor must be held low because of the electrolysis occurring at specific sensors.
The sensor signal present at the connecting node 25 is applied to the control unit 40 via the protective circuit 30. The signal is filtered, evaluated and, if required, permanently stored in the control unit 40. The control unit 40 generates a warning signal when a predetermined residue quantity is reached which corresponds to a specific output signal of the residue sensor. A fault indicator 50 is driven in dependence upon this warning signal. The driver can then immediately recognize therewith that the functional capability of the filter is limited.
The entire monitoring circuit 100 is integrated into the control apparatus of the control unit 40 or means of the control unit 40 already available are used.
REFERENCES:
patent: 4034335 (1977-07-01), Harazoe et al.
patent: 4562431 (1985-12-01), Jahnke et al.
"Digitale Diesel-Elektronik beim BMW-Turbodieselmodell 324td", by G. Schwarzbauer et al., Motortechnische Zeitschrift 49 (1988) 1, pp. 37 to 41.
Kamen Noah P.
Ottesen Walter
Robert & Bosch GmbH
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