Auxiliary starter, particularly for diesel engines

Details Auxiliary starter, particularly for diesel engines Auxiliary starter, particularly for diesel engines

1996-03-26

1997-10-21

McMahon, Marguerite

Internal-combustion engines

Combustion chamber means having fuel injection only

Injection of fuel onto igniter, deflector, heater, or atomizer

123143B, 123260, 123585, F02P 1902, F23Q 700, F02N 1708

Patent

active

056785186

DESCRIPTION:

BRIEF SUMMARY
STATE OF THE ART

The invention relates to an auxiliary starter, particularly for diesel engines, according to the generic type disclosed in the main claim.
Different auxiliary starting devices are known for starting cold diesel engines, such as sheathed element glow plugs or flame plugs. The auxiliary starting devices are disposed in the combustion chamber or in the intake pipe of diesel engines, and bring the diesel fuel introduced into the intake pipe by way of an injection stream to ignition. In sheathed element glow plugs, the ignition temperature is attained by an electrically-heated glow plug whose temperature can be above 1000.degree. C.


ADVANTAGES OF THE INVENTION

In contrast, the auxiliary starter of the invention having the characterizing features of the main claim has the advantage that the ignition temperature can be lowered and, at the same time, easier ignition of the fuel-air mixture is possible. Consequently, the engine has a more uniform run-up behavior during a cold start.


BRIEF DESCRIPTION OF THE PREFERRED EMBODIMENTS

An embodiment of the invention is illustrated in the drawing and explained in detail in the following description.
FIG. 1 shows a combustion chamber having a precombustion chamber of a diesel engine,
FIG. 2 shows an oxygen pump cell having a finger construction,
FIG. 3 shows an oxygen pump cell having a solid-electrolyte body and
FIG. 4 shows a cross-section through the solid-electrolyte body according to FIG. 3.


DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

A diesel engine having an engine block 11 includes a combustion chamber 12 having a precombustion chamber 13. An injection valve 14 having an injection stream 15 is inserted into the engine block 11 in such a way that the injection stream 15 is guided into the precombustion chamber 13. An auxiliary starting device 16 is further positioned in the precombustion chamber 13 such that it extends into the edge zone of the injection stream 15.
The auxiliary starting device 16 is an oxygen pump cell 18 which operates on the basis of an oxygen-ion-conducting solid electrolyte. Zirconium dioxide stabilized with Y.sub.2 O.sub.3, for example, is used as the solid-electrolyte ceramic. In accordance with FIG. 2, the solid-electrolyte ceramic can comprise a tubular solid-electrolyte body 20 which is closed on one side and has a finger construction, or, in accordance with FIGS. 3 and 4, it can be configured as a wafer-shaped solid-electrolyte body 30.
The tubular solid-electrolyte body 20 according to FIG. 1 is inserted into a metallic housing 23, and has a first electrode 21 on its outside surface and a second electrode 22 on its inside surface. The electrodes 21, 22 are provided with conductor paths, with the electrode 21 being contacted with the housing 23 and the electrode 22 being contacted with a contact part 24. A rod-shaped heating element 25 is disposed inside the solid-electrolyte body 20.
The wafer-shaped solid-electrolyte body 30 according to FIG. 3 is likewise secured in a metallic housing 33 with holding means 34 and sealing means 35. The solid-electrolyte body 30 according to FIG. 4 comprises, for example, a first solid-electrolyte film 36, a second solid-electrolyte film 37 and a third solid-electrolyte film 38. A channel 39 which is open on the side of the housing and is connected to the atmosphere is stamped into the second solid-electrolyte film 37. The channel 39 is closed at the end on the side of the injection stream. An external, first electrode 31 is disposed on the first solid-electrolyte film 36, and a second electrode 32 is positioned in the channel 39. A heater 41 is embedded into an electrical insulation 40 in the third solid-electrolyte film 38.
The heater element 25 of the tubular solid-electrolyte body 20 and the heater 41 of the wafer-shaped solid-electrolyte body 30 serve to bring the ceramic of the solid-electrolyte bodies to the appropriate operating temperature necessary for creating a conduction of oxygen ions. The oxygen-ion conduction and therefore the oxygen transport are already e

REFERENCES:
patent: 4189355 (1980-02-01), Fujishiro et al.
patent: 4212273 (1980-07-01), Maruoka
patent: 4340019 (1982-07-01), Barnert et al.
patent: 4487177 (1984-12-01), Ishikawa

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