Thermal measuring and testing – Temperature measurement – Combined with diverse art device
Patent
1997-04-16
1998-09-08
Gutierrez, Diego F.F.
Thermal measuring and testing
Temperature measurement
Combined with diverse art device
374112, 374134, 374142, 731182, G01K 114, G01K 1302, G01K 308
Patent
active
058036083
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method for generating a signal responsive to the induction air temperature of an internal combustion engine.
BACKGROUND INFORMATION
In present-day internal combustion engines, the metered fuel flow is precisely adjusted to the induction air quantity of the internal combustion engine. The air quantity is determined by an appropriate measuring process. In this process, for example, a pressure sensor mounted in the intake tract of the internal combustion takes a pressure measurement and, to determine the air quantity, the thus obtained pressure information is corrected as a function of the induction air temperature to compensate for the temperature dependency of the air density. The induction air temperature is ascertained by a temperature sensor mounted in the intake tract of the internal combustion engine. However, the accuracy of the temperature sensing may be adversely affected when heat produced by high temperatures in the engine compartment radiates to the temperature sensor and its surroundings.
Moreover, the temperature sensor has a certain inertia, so that the accuracy of the temperature sensing may likewise be adversely affected, especially when subjected to rapid temperature changes in the induction air, for example when the vehicle is accelerating. The object of the present invention is to make available a signal which will reproduce the induction air temperature very accurately. Advantageous embodiments of the method according to this following.
SUMMARY OF THE INVENTION
The principal advantage of the present invention is that it enables the induction air temperature of the internal combustion engine to be determined very precisely. In the process of the present invention, a signal is generated for the induction air temperature on the basis of a signal for the temperature of the internal combustion engine and a signal for the ambient temperature. The advantage of this process is that the need has been eliminated for a sensor to detect induction air temperature. Engine-temperature and ambient-temperature sensors are, as a rule, already present anyway.
When the signal is generated for the induction air temperature, a correction factor, which is a function of a signal for the induction air mass or air quantity of the internal combustion engine and of a signal for vehicular speed, is taken into consideration.
It is especially advantageous for the signal for the induction air temperature to be filtered, since this enables the dynamic behavior time response to be simulated very precisely. Different time constants are expediently used for the filtering process when working with rising and falling induction air temperatures.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 depicts a basic representation of the technical area where the present invention can be used.
FIG. 2 depicts a flow chart for illustrating the method of the present invention; and
FIG. 3 depicts a table of a characteristics map employed in the method of the present invention.
DETAILED DESCRIPTION
FIG. 1 shows a schematic representation of the technical area where the invention can be used. An air/fuel mixture is supplied via an intake tract 102 to an internal combustion engine 100, and the exhaust gases are given off into an exhaust duct 104. Arranged in intake tract 102--viewed in the flow direction of the induction air--are an air-flow sensor or mass air-flow sensor 106--for example a hot-film air-mass meter, a throttle valve 108 with a sensor 110 for detecting the opening angle of throttle valve 108, a pressure sensor 112, and at least: one injection nozzle 114. As a rule, either mass air-flow sensor 106 or pressure sensor 112 are alternatively provided. Mounted on internal combustion engine 100 are an engine speed sensor 116 and a temperature sensor 118. In addition, internal combustion engine 100 has, for example, four spark plugs 120 for igniting the air/fuel mixture in the cylinders. A temperature sensor 121 for determining the ambient temperature is mounted at an app
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Randoll Helmut
Roth Andreas
Gutierrez Diego F.F.
Robert & Bosch GmbH
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