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Method and device for operating an internal combustion engine in the event of a fault in a crankshaft sensor

a crankshaft sensor and internal combustion engine technology, applied in the direction of non-mechanical valves, electrical control, valve drives, etc., can solve the problems of deteriorating the camshaft is no longer available, etc., to improve the exhaust gas performance of the internal combustion engine, improve the internal combustion engine's exhaust gas performance, and reduce the control effort required

Inactive Publication Date: 2013-04-18
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a method and device for operating an internal combustion engine in case of a crankshaft sensor failure, which improves exhaust gas performance. This is achieved by using only one camshaft to determine the engine speed and position, while adjusting the second camshaft to set variable valve timing. This ensures reliable and precise speed and position determination, as well as precise timing for the variable valves. Turning the second camshaft out of its original position also improves exhaust gas performance, resulting in increased efficiency, increased power output, and reduced fuel consumption.

Problems solved by technology

The camshafts are thus no longer available for a camshaft adjustment in the various operating ranges of the internal combustion engine, which results in a deterioration of the exhaust gas performance of the internal combustion engine.

Method used

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  • Method and device for operating an internal combustion engine in the event of a fault in a crankshaft sensor
  • Method and device for operating an internal combustion engine in the event of a fault in a crankshaft sensor
  • Method and device for operating an internal combustion engine in the event of a fault in a crankshaft sensor

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Embodiment Construction

[0020]Identical features are indicated by the same reference symbols.

[0021]FIG. 1 shows a basic representation of an internal combustion engine 1 in the shape of a V. In this instance, cylinders 2 of internal combustion engine 1 are arranged in a v-shape on two planes 3, 4, a crankshaft 5 being situated at the intersection of the two planes 3, 4. Each plane 3, 4 is typically called a bank. Each cylinder 2 is equipped with one or more intake valves 6 and one exhaust valve 7. Fresh air and fuel are conveyed through intake valve 6 into the respective cylinder 2 of internal combustion engine 1, while the combustion products of cylinder 2 in the form of exhaust gas are discharged from internal combustion engine 1 via exhaust valve 7. Intake valves 6 of first plane 3 of cylinders 2 are connected to a first camshaft 8, while exhaust valves 7 of first plane 3 are operated by a second camshaft 10. Analogously, intake valves of second plane 4 of cylinders 2 connect to a third camshaft 9, and ...

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Abstract

A method for operating an internal combustion engine in the event of a fault in a crankshaft sensor is provided, the internal combustion engine having at least two camshafts and a speed and / or a position of the internal combustion engine being derived from a signal taken from the camshaft. In order to improve the exhaust gas performance of the internal combustion engine even in a crankshaft emergency operating mode, only a first camshaft is used to determine the speed and / or the position of the internal combustion engine, while the second camshaft. is adjusted in its angle of rotation in order to set a variable valve operating mechanism on the intake and exhaust valves of the internal combustion engine that are driven by the second camshaft.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a method for operating an internal combustion engine in the event of a fault in a crankshaft sensor, the internal combustion engine having at least two camshafts and a rotational speed and / or a position of the internal combustion engine being derived from a signal taken from the camshaft, and to a device for implementing the method.[0003]2. Description of the Related Art[0004]In today's motor vehicles it is important to determine the speed of the internal combustion engine precisely since this parameter enters into numerous open-loop and closed-loop control processes of the motor vehicle. Usually, this speed is derived from the rotational speed of a crankshaft, which is driven by the mechanical energy generated in the combustion process. For this purpose, the crankshaft is scanned by a crankshaft sensor, which detects the speed and position of the crankshaft. The signal is provided by a ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F01L1/344
CPCF01L1/34F01L2001/0537F01L2001/34496F01L1/344F01L2800/12F01L2820/041F01L2820/042F01L2800/11F01L1/04F01L13/00F02D13/00F02D41/22F02D45/00F01L9/20
Inventor PIETSCH, ELMARNEFZER, ULRICH-MICHAELDERINGER, CARSTEN
Owner ROBERT BOSCH GMBH
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