Method for adjusting a travel transducer
First Claim
1. A method for adjusting a travel transducer (13) of a fuel injection pump which emits control signals to an electric control unit in accordance with the positions of a control element (10) which controls fuel injection quantities in a fuel supply system for internal combustion engines, which comprises mounting an operational fuel injection pump on an operation test bench, moving the control element (10) to approach at least two operating points which correspond to different fuel injection quantities in a fuel injection pump performance graph for injecting a set fuel quantity corresponding to a particular rpm, indicating positions of the control element (10) in accordance with said at least two operating points, transmitting said indicated positions to a movable part (132) of said tavel transducer;
- deriving electrical control signals from a supply voltage picked up by the travel transducer (13) at said at least two points;
comparing the control signals with set-point signals predetermined by two operating points; and
correcting a basic setting of the travel transducer (13) as a function of a signal deviation between said set-point signals and said derived signals in the fuel injection quantity control device to obtain a basic setting.
1 Assignment
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Accused Products
Abstract
Motor vehicle components that function in accordance with the operating state of a fuel injection pump require a load signal from the pump that represents an accurate quantity relationship, so that they can function in a properly adapted manner. The accurate quantity relationship is attained in that initially, by mechanical means, two additional stops, temporarily lengthened by a spacer gauge, on the pump limit the rotation of an adjusting lever. The conversion into an electrical signal is effected via a potentiometer coupled to the adjusting lever, the characteristic curve of the potentiometer being effected in such a way, in a calibration process by means of laser trimming of two compensating resistors connected in series with the potentiometer, that the set-point voltages with which predetermined quantities are associated are attained at both stops. This reference voltage is suitable for triggering succeeding components of the fuel injection pump.
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Citations
10 Claims
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1. A method for adjusting a travel transducer (13) of a fuel injection pump which emits control signals to an electric control unit in accordance with the positions of a control element (10) which controls fuel injection quantities in a fuel supply system for internal combustion engines, which comprises mounting an operational fuel injection pump on an operation test bench, moving the control element (10) to approach at least two operating points which correspond to different fuel injection quantities in a fuel injection pump performance graph for injecting a set fuel quantity corresponding to a particular rpm, indicating positions of the control element (10) in accordance with said at least two operating points, transmitting said indicated positions to a movable part (132) of said tavel transducer;
- deriving electrical control signals from a supply voltage picked up by the travel transducer (13) at said at least two points;
comparing the control signals with set-point signals predetermined by two operating points; and
correcting a basic setting of the travel transducer (13) as a function of a signal deviation between said set-point signals and said derived signals in the fuel injection quantity control device to obtain a basic setting. - View Dependent Claims (2, 3, 4)
- deriving electrical control signals from a supply voltage picked up by the travel transducer (13) at said at least two points;
- 5. An apparatus for adjusting a travel transducer of a fuel injection pump which emits control signals to an electric control unit in accordance with the positions of an adjusting lever (10) disposed on the outside of said fuel injection pump, said adjusting lever is connected on the inside of the fuel injection pump with a fuel governor, said adjusting lever is pivotable between a full-load stop (11) and an idling stop (12) and is coupled with a movable part (131) of said travel transducer (13), said travel transducer has an arrangement for varying a basic setting, at least two additional adjustable stops (3, 4) are provided in or beside a pivoting transducer (13) or of said adjusting lever (10), each of said adjustable stops (3, 4) are provided with a spacer gauge (14) which are transmittable into the pivoting range or pivoting plane to the movable part (131) of the travel transducer (13) or to the adjusting lever (10), to establish operating points which are indicated on said fuel injection pump.
Specification