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Method for checking the plausibility of a temperature value in an internal combustion engine

A technology of temperature value, internal combustion engine, applied in the direction of thermometer testing/calibration, internal combustion piston engine, thermometer, etc., can solve problems such as inability to know

Active Publication Date: 2010-12-08
VTESCO TECH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is also not known from this document that comparing the temperature value and the model value respectively with the limit value

Method used

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  • Method for checking the plausibility of a temperature value in an internal combustion engine
  • Method for checking the plausibility of a temperature value in an internal combustion engine
  • Method for checking the plausibility of a temperature value in an internal combustion engine

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Embodiment Construction

[0036] figure 1 with 2 A characteristic curve 1 is shown schematically, which shows the torque loss M of the internal combustion engine 损失 and the refrigerant temperature T of the internal combustion engine 制冷剂 dependencies between. It can be seen from this that characteristic curve 1 has a decreasing temperature dependence. This means that, in figure 1 Relatively high refrigerant temperature T in 制冷剂 The temperature change under has a resulting torque loss M 损失 The relatively small effect of , while in such as figure 2 The relatively low refrigerant temperature T in the 制冷剂 The temperature change under has a resulting torque loss M 损失 relatively large impact.

[0037] Therefore, the two figures respectively show the temperature measurement T 测量 (T MESS ) and the actual temperature value T 实 际 (T IST ) and the associated temperature measurement error ΔT and the resulting torque error ΔM.

[0038] If the maximum value ΔM of the tolerable torque error ΔM is given...

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Abstract

The invention relates to a method for checking the plausibility of a temperature value in an internal combustion engine, comprising the following steps: ascertaining a measurement value (TCO) of the temperature value, ascertaining a model value (TCO_SUB) of the temperature value, comparing the measurement value (TCO) and / or the model value (TCO_SUB) to at least one threshold value (TCOMAX), determining the plausibility of the temperature value as a function of the comparison, and defining the threshold value (TCOMAX) as a function of the temperature value in the internal combustion engine.

Description

technical field [0001] The invention relates to a method for plausibility testing of temperature values ​​in an internal combustion engine according to the preambles of the independent claims. Background technique [0002] Internal combustion engines, such as four-stroke engines and diesel engines, have a temperature-dependent torque loss due to their internal friction, wherein this torque loss decreases progressively with engine temperature. This means that the internal combustion engine has a relatively high torque loss at low engine temperatures after a cold start, whereas the torque loss is significantly lower after reaching the operating temperature of the internal combustion engine. [0003] Therefore, in the case of modern internal combustion engines, the engine temperature is determined by, for example, measuring the refrigerant temperature or the fuel temperature by temperature sensors. From the measured values ​​of the engine temperature, the temperature-dependent...

Claims

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Application Information

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IPC IPC(8): G01K15/00F02D41/22
CPCG01K15/00F02D41/222Y02T10/40F02D2200/1006
Inventor G·埃泽
Owner VTESCO TECH GMBH
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