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Method and device for detecting malfunctions of various exhaust gas probes during operation of an internal combustion engine

A technology of exhaust gas probe and internal combustion engine, applied in electrical control, mechanical equipment, engine control, etc., can solve the problems of slow response characteristics, aggravated harmful substance emission, change of invalid time, etc., and achieve the effect of reliable diagnosis

Active Publication Date: 2017-03-01
VTESCO TECH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Exhaust gas probes may exhibit malfunctioning properties, e.g. due to contamination or deposits on the probe
Failure of the exhaust gas probe can lead to a noticeably slower response characteristic or also to a noticeably changed dead time
In this case, if no other measures are taken, the discharge of harmful substances to the outside world will be exacerbated

Method used

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  • Method and device for detecting malfunctions of various exhaust gas probes during operation of an internal combustion engine
  • Method and device for detecting malfunctions of various exhaust gas probes during operation of an internal combustion engine
  • Method and device for detecting malfunctions of various exhaust gas probes during operation of an internal combustion engine

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Embodiment Construction

[0020] The internal combustion engine includes the intake port, the engine block, the cylinder head and the exhaust port 1 ( figure 1 ). The intake duct preferably includes a throttle valve and also includes a collector and an intake duct which projects into the engine block towards the cylinders via the inlet duct. Furthermore, the engine block includes a crankshaft, which is coupled with the pistons of the cylinders via connecting rods.

[0021] The cylinder head includes a gas distribution train with gas inlet valves and gas outlet valves. The cylinder head also includes injection valves 2 and preferably spark plugs. Alternatively, injection valve 2 can also be arranged on the intake manifold.

[0022] An exhaust gas catalytic converter, preferably designed as a three-way catalytic converter, is arranged on the exhaust tract 1 . In addition, a further exhaust gas catalytic converter 5 , which is designed as a NOx catalytic converter, is optionally arranged on the exhaus...

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Abstract

To operate the internal combustion engine, a defined forced excitation is applied to the air ratio, which serves as the basis for the setpoint of the lambda controller. During the diagnostic mode, the diagnostic function (DIAGF) is used to determine whether there is a probe error (SOND_ERR) in the exhaust gas probe. If a probe fault is detected (SOND_ERR), the value of the measurement signal is detected as a start value (STW) in time relative to the edge of the setpoint curve of the lambda controller, after a defined first time period (TD1) The current value of the measurement signal is then detected as an end value (EW). From the start value (STW) and the end value (EW) it is known whether there is a filter fault (FIL_ERR) or an invalid time fault of the exhaust gas probe (DEL_ERR). The first time period (TD1) is suitably set such that the corresponding difference between the end value (EW) and start value (STW) in case of filter failure (FIL_ERR) is the same as the end value in case of invalid time failure (DEL_ERR) The corresponding difference between (EW) and start value (STW) differs by the specified difference.

Description

technical field [0001] The invention relates to a method and a device for operating an internal combustion engine with an exhaust gas probe arranged upstream of or in the exhaust gas catalytic converter on the exhaust tract of the internal combustion engine, the measurement signal of which indicates the flow through it The residual oxygen content of the exhaust gas. Background technique [0002] With regard to the permissible emission of pollutants from motor vehicles in which an internal combustion engine is provided, increasingly stringent legal regulations require that the emission of pollutants during operation of the internal combustion engine be kept as low as possible. On the one hand, this can be achieved by taking measures to reduce the emissions of pollutants that occur during the combustion of the air / fuel mixture in the corresponding cylinders of the internal combustion engine. On the other hand, exhaust gas aftertreatment systems are used in internal combustion...

Claims

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Application Information

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IPC IPC(8): F02D41/14F02D41/24F02D41/22
CPCF02D41/1441F02D41/1454F02D41/1456F02D41/1495F02D41/2422F02D2041/1431F02D2041/1432F02D2041/227F02D41/1439F02D41/1473
Inventor H.马哈维拉T.阿尔特
Owner VTESCO TECH GMBH
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