Internal-combustion engines – Charge forming device – With fuel pump
Patent
1993-04-22
1994-09-13
Miller, Carl S.
Internal-combustion engines
Charge forming device
With fuel pump
123479, 123198D, F02M 3704, F02B 7700
Patent
active
053459156
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is based on a control system for the electric fuel pump of an internal combustion engine From DE-PS 1 526 504, a circuit arrangement for driving a fuel pump in an internal combustion engine is known, in which below a minimum engine speed, the supply of electricity to the fuel pump is cut off. The circuit arrangement described there is based on the concept that, when the ignition is switched on, the engine speed drops below minimum values only when the engine is braked by external intervention, especially in the case of an accident. In this case, for reasons of safety, the supply of fuel from the tank in the direction towards the engine should be interrupted. Furthermore, in the German Published Patent Applications 20 65 928 and 22 49 235, devices are described which, for the same aforementioned reasons, interrupt the supply of fuel to the engine when it is stopped. There, this standstill of the engine is detected via an appropriate detection of the air flow in the induction manifold, in that in the idle position of the air flow meter flaps in the intake pipe, a switch is activated accordingly, and that depending on this switch activation, the electricity supply to the electrically driven fuel pump is then also interrupted. Naturally, for the case of start-up, suitable measures must be taken, in order to deactivate this safety function, especially at the beginning of start-up.
It has now been shown that with the conventional safety cut-out of the electrical fuel pump in internal combustion engines, possibilities of errors can arise which lead to unwarranted triggering of this safety cut-out.
SUMMARY OF THE INVENTION
It is therefore the object of this invention to develop and provide a safe and reliable control system for an electrical fuel pump of an internal engine having an improved safety shut off.
According to the invention, the control system for an electrically driven fuel pump of an internal combustion engine comprises means for sensing a speed of a shaft of the engine, means for sensing another speed, and logic means for generating a shut off signal for the fuel pump. The logic means is connected to both sensing means and has comparison means receiving speed signals from said sensing means for shutting off the fuel pump only if both speeds deviate from a specified speed range.
With the control system for the electric fuel pump of an internal combustion engine in accordance with the invention, a high degree of safety and reliability of a fuel pump shut off system is achieved, which can, moreover, be realised in a simple manner.
BRIEF DESCRIPTION OF THE DRAWING
The objects, features and advantages of the present invention will now be illustrated in more detail by the following detailed description, reference being made to the accompanying drawing in which:
The sole FIGURE is a block diagram of a device for controlling an electric fuel pump of an internal combustion engine according to the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The embodiment shown in the drawing is a control system for the electric fuel pump of an internal combustion engine, in which the electric motor of the fuel pump, not shown in further detail, is designated 10. It receives its supply voltage E.sub.Batt via a switch 11 from a supply line 12.
13 represents a first sensor for a first engine speed; 14 is a second sensor for a second engine speed. In the concrete case, the sensor 13 is assigned to the engine crankshaft, and the sensor 14 to the camshaft. On the output side, the two sensors 13 and 14 are connected to a block 15, in which one threshold value interrogation each, 16a and 16b, is symbolically shown for the signals of the two sensors 13 and 14, as is an AND-gate 17 for the output signals of the threshold value interrogations. For its part, this AND-gate 17 in turn controls the switch 11 between the electricity supply line 12 and the electric motor 10 of the fuel pump. To complete it, block 15 is connected with the electricity supply line 12 via a supply voltage
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Power, Bd 132, Nr. 9, Sep. 1, 1988, New York, US, pp. 39-42 Lockner "Enhancing Prime-Mover Controls with Fault-Tolerant Systems".
Flaetgen Dietmar
Koelle Ulrich
Schmitz-Huebsch Axel
Miller Carl S.
Robert & Bosch GmbH
Striker Michael J.
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