Internal-combustion engines – Combustion chamber means having fuel injection only – Using multiple injectors or injections
Patent
1991-10-21
1992-09-08
Miller, Carl S.
Internal-combustion engines
Combustion chamber means having fuel injection only
Using multiple injectors or injections
123500, F02B 300, F02M 3704
Patent
active
051449250
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a fuel injection device for fuel-injected internal combustion engines, in which a pump piston and a pump piston bushing or a control sleeve can be turned relative to each other and the end of output is defined by at least one slanted control edge of one part which slides over an overflow hole of the respective other part, and the start of output is determined by another control edge of this part that slides over the overflow hole of the respective other part; whereby to achieve a pre-injection and a main injection, a take-up piston is provided that is driven in a take-up cylinder connected to the high pressure chamber and whereby the volume released by the take-up piston determines the injection pause between pre-injection and main injection.
When the part that can rotate, namely the pump piston or the control sleeve, is turned out of the "zero output" position by a certain control angle, in the direction corresponding to an increase in the output, the output begins and thus the pre-injection. During a control angle increase at constant speed, first the pre-injection quantity increases rapidly, after which it remains constant and at the same time the total quantity remains constant for a long time. When the dynamic opening pressure of the take-up piston is reached, the take-up piston begins to move and the take-up cylinder accepts the fuel quantity supplied. With increasing control angle, the take-up cylinder takes up more and more fuel quantity. This continues until the entire acceptance volume of the take-up cylinder has been reached. Starting from this control angle position, the main injection starts to form.
In the known arrangements, the curve of the slanted control edge is continuous. The control angle, via which the rotating part must be turned in the phase from the beginning of gradual fuel supply into the take-up cylinder until the full acceptance volume of the take-up cylinder is reached, which corresponds to the interval between pre-injection and main injection, is relatively large. Thus, a large control angle results over the entire control range, and such a large control angle causes difficulties in some actuators. During this phase, nothing in the injection behavior changes and thus there is additionally the danger that the status signal will display an error. This also represents a significant disadvantage. A reduction in the control angle could even be achieved with a steeper arrangement of the slanted control edge, but this would in turn decrease the control sensitivity.
The task of the invention is to reduce the required control angle. To fulfill this task, the invention basically consists of the fact that, in the area of zero output, the angled control edge exhibits a recess that runs back in the direction of rotation that corresponds to an increase in the output, and that the distance from the point, at which the slanted control edge changes into the recess that runs back, to the control edge controlling the start of the output, is larger than the diameter of the overflow hole. Because of this recess, the "zero output" rotation is displaced in the direction of the rotation corresponding to an increase in output. The rotational angle between the rotation corresponding to "zero output" at maximum engine speed and the rotation corresponding to idle is reduced. In this way, the control angle is also reduced in the phase between the beginning of fuel overflow into the take-up cylinder until the full acceptance volume of same is reached. It is even possible to reduce this control angle to zero at a preset engine speed. In this way, a significant reduction of the entire control angle is achieved over the entire control range.
When the control edge area moves over the overflow hole, the output is ended. This applies both to idle and to the load cycle. Since the distance from the point, at which the slanted control edge changes into the recess that runs back, to the control edge controlling the start of output, is greater than the diameter of the overflow hole, there re
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Automotive Diesel Gesellschaft m.b.H.
Miller Carl S.
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