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Method and system for variable displacement engines

An engine system, engine cylinder technology, applied in the direction of engine components, combustion engines, engine control, etc., can solve the problems of increased exhaust tailpipe emissions, shortened engine life, etc., to improve emissions, improve timely identification, reduce costs and complexity sexual effect

Pending Publication Date: 2020-10-09
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This can lead to increased tailpipe emissions due to oil being drawn out of the piston rings during the exhaust stroke of the deactivated cylinders
Plus, increased fuel consumption can shorten engine life

Method used

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  • Method and system for variable displacement engines
  • Method and system for variable displacement engines
  • Method and system for variable displacement engines

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Embodiment Construction

[0016] The following description relates to a system for diagnosing cylinder valve operation in an engine configured with selectively deactivatable cylinders, such as figure 1 connected at figure 2 Engine system in a vehicle system) and method. The engine controller can be configured to execute control programs such as image 3 An exemplary routine of ) to inhibit cylinder fueling in response to cylinder deactivation conditions being met, and to diagnose cylinder exhaust valve function during deactivation based on crankshaft acceleration measured during an exhaust stroke of the deactivated cylinder. The crankshaft acceleration sensed during the exhaust stroke of a deactivated cylinder can be compared to the Figure 5 Compare with the map values ​​generated during the calibration procedure depicted in . During calibration, crankshaft acceleration is captured for each cylinder over a range of engine speeds and loads with commanded opening and closing of the exhaust valves. ...

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Abstract

The invention provides a method and a system for variable displacement engines. Methods and systems are provided for diagnosing valve operation during a cylinder deactivation event in a variable displacement engine. Crankshaft acceleration data is captured during an exhaust stroke of a deactivated cylinder and compared to a calibrated map of crankshaft acceleration data for the given cylinder. Based on the comparison, it may be indicated that the deactivation of the exhaust valve of the given cylinder sis degraded, and that the exhaust valve is open when commanded closed.

Description

technical field [0001] The present invention generally relates to methods and systems for identifying and addressing exhaust valve deactivation mechanism degradation in variable displacement engines. Background technique [0002] Some engines, known as variable displacement engines (VDEs), can be configured to operate with a variable number of cylinders active or deactivated to improve fuel economy while optionally maintaining a total exhaust mixture air-fuel ratio of approximately stoichiometry. Among other things, a portion of the engine's cylinders may be disabled during selected conditions defined by parameters such as a speed / load window, as well as various other operating conditions including engine temperature and vehicle speed. The VDE control system may disable selected cylinders by controlling multiple cylinder valve deactivators that affect the operation of the cylinder's intake and exhaust valves. Additionally or alternatively, fueling of selected cylinders may...

Claims

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Application Information

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IPC IPC(8): F02B77/08F02D13/06F02D41/00
CPCF02B77/082F02D13/06F02D41/0087F02D2041/0012F02D2200/1002F02D2200/101F02D41/1497F02D41/221F02D2200/1012Y02T10/40F01L13/0005F01L2800/00F02D2200/0406G01M15/09
Inventor 泰勒·凯利亚当·克拉奇
Owner FORD GLOBAL TECH LLC