Protection system for a turbocharged internal combustion engine

Internal-combustion engines – Charge forming device – Fuel injection system

Patent

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Details

60603, F02D 2302, F02D 4122

Patent

active

059133015

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention relates to a protection system for a turbocharged internal combustion engine.


BACKGROUND INFORMATION

A conventional protection system is described in German Patent No. 43 10 261. (not a prior art publication), where intervention in the open and/or closed loop control of the turbocharging of the internal combustion engine takes place during a first supercharging (excessive) stage and fuel delivery to the individual cylinders is interrupted following a predefined suppression pattern during a second supercharging (excessive) stage. This pattern may be successively modified to other suppression patterns with a higher suppression frequency.
In a turbocharged internal combustion engine described in U.S. Pat. No. 4,470,390, cylinder injection suppression is performed according to a certain pattern as a function of a plurality of turbocharging thresholds in order to protect the engine from being destroyed by supercharging.
U.S. Pat. No. 5,299,423 describes a process for adjusting the throttle valve as a function of the turbocharge pressure to avoid excessive turbocharge pressure and protect the engine.
The object of the present invention is to ensure optimum protection of the turbocharged internal combustion engine.


SUMMARY OF THE INVENTION

Contrary to the conventional systems, no direct intervention in the turbocharge (or normal supercharge) control takes place in the present invention. Furthermore, the invention provides quicker triggering of the protective measures in the case of repeated supercharging than in a one-time occurrence, i.e., the response times of the protection system according to the present invention are modified. Furthermore, the present invention makes a distinction between a supercharge condition caused, for example, by an overshoot of the turbocharge pressure control circuit and a supercharge condition caused by a serious defect, for example, a loose hose connection. Another difference between the invention and the related art consists of the fact that under predefinable operating conditions, any functions activated as a result of a one-time or repeated supercharge condition are de-activated again, setting the modified response times to their original values.
The present invention is advantageous in that it allows optimum protection of a turbocharged internal combustion engine from a supercharge damage. In the protection system according to the present invention, injection to individual cylinders of the internal combustion engine is suppressed by a predefinable first suppression pattern if a parameter that characterizes the turbocharging meets a predefinable first activation condition. Furthermore, injection to individual cylinders of the internal combustion engine is suppressed according to a predefinable second suppression pattern if a parameter that characterizes the turbocharging meets a predefinable second activation condition. If the first activation condition occurs repeatedly, the first activation condition is modified, and if the second activation condition occurs repeatedly, the first and second activation conditions are modified. This has the advantage that, if the activation conditions occur for the first time, these activation conditions may be configured so that accidental cylinder suppression cannot occur, with the result that a certain period of time elapses before cylinder suppression is activated. In order to protect the internal combustion engine, however, if cylinder suppression is needed more frequently, the first time period does not have to elapse every time before suppression is activated. Therefore it is advantageous to modify the activation condition after the first occurrence.
Instead of cylinder injection suppression, intervention in the throttle valve position can also be used. The suppression patterns used are then replaced with two interventions of different intensities in the throttle valve position.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a schematic representation of a turbocharged internal combus

REFERENCES:
patent: 4470390 (1984-09-01), Omori et al.
patent: 4603552 (1986-08-01), Kido
patent: 5105779 (1992-04-01), Thompson
patent: 5299423 (1994-04-01), Shiozawa et al.
patent: 5502966 (1996-04-01), Unland et al.

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