Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – With indicator or control of power plant
Reexamination Certificate
1999-07-13
2001-08-07
Dolinar, Andrew M. (Department: 3747)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
With indicator or control of power plant
C123S568110, C701S103000
Reexamination Certificate
active
06272427
ABSTRACT:
FIELD OF INVENTION
The present invention is based on a method as well as a device for controlling an internal combustion engine as a function of performance characteristics, such as air filling, engine speed, engine temperature and intake air temperature. As far as the intake air temperature in particular is concerned, it has a number of effects on the behavior of the internal combustion engine. With otherwise identical ambient conditions, a higher intake air temperature produces effects including a higher knock tendency, improved evaporation of the fuels, reduced wall film formation of the fuels on the interior walls of the intake manifold as well as a reduction of the volume of air taken in and accordingly of the quantity of fuel required. Against this background, modern controls for internal combustion engines condition the intake air temperature, for which an appropriate sensor is inevitably required.
BACKGROUND INFORMATION
German Patent No. 44 35 419 A1, which relates to a “control system for proportioning the fuel of an internal combustion engine” and in which the intake air temperature value is used among other things for the determination of a warm start case, may be pointed out as exemplary of the extensive conventional methods in connection with the use of a signal of the intake air temperature in the context of the control of an internal combustion engine.
Primarily reasons relating to space requirements in the area of the internal combustion engine are the reason that sensors for the intake air temperature are usually not mounted in the immediate vicinity of the internal combustion engine but rather, for example, in the air filter housing, in a mass air flow meter, in the throttle valve connector or in combination with an intake manifold pressure sensor. The temperature measured with these sensors does not then correspond to the actual intake temperature in the vicinity of the intake valve which is relevant to the operation of the internal combustion engine when the intake air can become heated on the warm walls of the intake manifold on its path to the internal combustion engine. In internal combustion engines with exhaust gas recirculation, there is the additional heating of the intake air by an admixture of the hot exhaust gas.
It has now been shown that it is not always possible to obtain optimal results in relation to the influence of the intake air temperature with the conventional systems.
SUMMARY OF THE INVENTION
An object of the present invention is to specify a method as well as a device to make possible a determination of the intake air temperature which is relevant to the control of the internal combustion engine.
The present invention makes it possible to model the intake air temperature of an internal combustion engine in the vicinity of the intake valves by approximation. The basis for this is measurement of the intake air temperature upstream in the intake path, the heating of the intake air in the intake manifold on its way to the intake valves being additionally taken into account. In the case of exhaust gas recirculation, its contribution to the heating of the intake air is additionally included.
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patent: 196 28 235 (1971-06-01), None
patent: 44 35 419 (1996-04-01), None
patent: 2-112739 (1990-04-01), None
Benninger Nikolaus
Pfitz Manfred
Stuber Axel
Wild Ernst
Castro Arnold
Dolinar Andrew M.
Kenyon & Kenyon
Robert & Bosch GmbH
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