Internal-combustion engines – Means to whirl fluid before – upon – or after entry into...
Reexamination Certificate
1999-08-06
2001-08-28
Kwon, John (Department: 3747)
Internal-combustion engines
Means to whirl fluid before, upon, or after entry into...
C123S184560, C123S568210
Reexamination Certificate
active
06279530
ABSTRACT:
BACKGROUND INFORMATION
In an internal combustion engine, the charge of the cylinders is mainly controlled by way of the throttle valve in the induction pipe. However, there are a number of other controlling elements which have an influence on the charge, as well. In particular, they are controlling elements which are used to improve the driving properties, or to ensure operation of the internal combustion engine which is optimized from the standpoint of performance and fuel consumption. Belonging to these controlling elements are, e.g., an exhaust-gas recirculation valve, a device for changing the geometry of the induction pipe, a device for changing the position of the camshaft, and a device for the adjustment of swirl valves in the intake ports of the cylinders. The influences of all these controlling elements on the charge are very different. The result is that, in response to a change in the engine load, a change takes place in the charge which is not in harmony with other operating parameters of the engine such as the ignition-advance angle, the start of injection or the injection quantity. This phenomenon leads to a deterioration in drivability, and also does not allow operation of the engine which is optimized from the standpoint of performance and consumption.
Therefore, an object of the present invention is to provide a method by which the driving properties are improved and which permits an operation of the engine which is optimized from the standpoint of performance and fuel consumption.
SUMMARY OF THE INVENTION
According to the present invention, for each controlling element, a triggering instant is determined which is adapted to its individual reaction time, so that all controlling elements simultaneously deploy their action influencing the charge. This measure makes it possible to achieve a desired charge at a defined point of time, so that a clear time relation to the change of other operating parameters can be attained.
The triggering instant for each controlling element can be determined as a function of the engine speed. The controlling element can be triggered when a specific lead speed is reached which is before a setpoint speed at which the charge must have reached its setpoint value. To that end, a setpoint speed is ascertained corresponding to the driver's input, a speed gradient is ascertained from the instantaneous speed and the setpoint speed, and the individual lead speed for each controlling element is derived from the setpoint speed and the speed gradient, taking into account the reaction time of the controlling element.
REFERENCES:
patent: 5432701 (1995-07-01), Mayer et al.
patent: 5495840 (1996-03-01), Ohtsuka et al.
patent: 5555865 (1996-09-01), Kim
patent: 5575248 (1996-11-01), Tada
patent: 5832896 (1998-11-01), Phipps
patent: 6089206 (2000-07-01), Suzuki et al.
Kenyon & Kenyon
Kwon John
Robert & Bosch GmbH
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