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Method and system for engine control

An engine and engine load technology, applied in engine control, mechanical control, engine components, etc., can solve the problems of high probability of exhaust gas spontaneous combustion, shortened life of engine components, increased engine knock and pre-ignition, etc.

Active Publication Date: 2022-06-24
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the mechanism is stuck at a compression ratio higher than desired (such as when the mechanism is at a higher compression ratio setting or during a transition to a lower compression ratio setting (but before) is stuck), the risk of engine knock and pre-ignition (pre-ignition) may increase
Specifically, higher pressure at spark can lead to higher temperatures and a higher probability of spontaneous ignition of unburned exhaust
The occurrence of knocking and pre-ignition can shorten the life of engine components

Method used

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  • Method and system for engine control
  • Method and system for engine control
  • Method and system for engine control

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Embodiment Construction

[0015] as reference figure 1 The following description relates to systems and methods for reducing the risk of knock and pre-ignition in an engine system configured with a variable compression ratio (VCR) mechanism. By actuating the VCR mechanism, the position of the piston within the combustion chamber can be changed, allowing for increased thermal efficiency. The controller can be configured to execute control programs such as figure 2 example program) to be based on engine operating conditions (as by reference to Figure 5 table) to change the compression ratio of the engine. In response to degradation of the VCR mechanism, the controller may clip engine load based on the compression ratio at which the mechanism is stuck. The controller may detect VCR mechanism degradation based on feedback about the position of the mechanism or based on the knock frequency and use of adaptive spark retard, as in image 3 described here. exist Figure 4 Example engine operation using...

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Abstract

The present invention relates to methods and systems for engine control. Methods and systems are provided for indicating degradation of a VCR mechanism that mechanically changes cylinder compression ratio. Degradation is detected based on elevated knock occurrences and increased spark retard usage. If the VCR mechanism is stuck, knocking and pre-ignition that may be caused by continued operation at a higher than expected compression ratio is mitigated by limiting engine load.

Description

technical field [0001] The present invention generally relates to methods and systems for controlling an engine in response to degradation of a variable compression ratio mechanism. Background technique [0002] The compression ratio of an internal combustion engine is defined as the ratio of the cylinder volume when the piston is at bottom dead center (BDC) to the cylinder volume when the piston is at top dead center (TDC). Generally, the higher the compression ratio, the higher the thermal efficiency of the internal combustion engine. This in turn results in improved fuel economy and a higher ratio of output energy to input energy of the engine. In conventional engines, the compression ratio is fixed and therefore engine efficiency cannot be optimized under operating conditions to improve fuel economy and engine power performance. [0003] In variable compression ratio (VCR) engines, the engine may be equipped with various mechanisms for mechanically changing the volume ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D15/02F02B75/04F02D35/02F02D37/02F02D41/00F02P5/152
CPCF02B75/04F02D15/02F02D35/027F02D37/02F02D41/0007F02P5/1528F02D41/22F02D35/028F02D2041/227F02D2041/228F02D2700/03F02D13/0226F01B31/14F02P5/152F02B37/183Y02T10/12F02B75/045
Inventor C·P·格鲁格拉
Owner FORD GLOBAL TECH LLC