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Resonance Management Strategies

A cylinder and torque output technology, applied in the direction of valve device, electrical control, combustion engine, etc.

Active Publication Date: 2022-02-25
EATON INTELLIGENT POWER LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

however, a long-standing obstacle to implementing CDA is the presence of torque and other noise, vibration, and harshness (NVH) that are beyond the design range of standard working engines and associated equipment

Method used

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Examples

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Embodiment Construction

[0050]Reference will now be made in detail to the examples illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. Directional references such as "left" and "right" are for ease of reference to the drawings.

[0051] go to Figure 1C , shows a baseline of the frequency distribution of the main force function for a multi-cylinder engine at a reciprocating speed of 800 revolutions per minute (RPM) of a reciprocating piston assembly coupled to the cylinders. The torque frequency content in Hertz (Hz) is plotted against the torque frequency amplitude in Newton-meters (Nm). In this example, the frequency distribution of the first order force function occurs around 40 Hz with an amplitude of about 475 Nm. The frequency distribution of the second-order force function occurs around 80 Hz with an amplitude of about 225 Nm. The frequency distribution of the third-order force func...

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Abstract

The present invention provides a method for managing the frequency distribution of a force function during operation of a multi-cylinder engine. a first stroke pattern is selected for the first cylinder and includes opening and closing of the first intake valve and the first exhaust valve during at least two reciprocations of the first reciprocating piston Sequential downtime operation. Operate a first stroke pattern on the first cylinder, a second stroke pattern on the second cylinder, and at least a third stroke pattern on the remaining cylinders for meeting or exceeding the desired torque output and forming the first overall a forcing function frequency distribution, the first total forcing function frequency distribution comprising a main forcing function frequency that is less than or similar in magnitude and less than or similar in frequency value to one of the corresponding baselines of the main forcing function frequency distribution distributed.

Description

technical field [0001] This patent application provides strategies for managing resonance during engine operation. Background technique [0002] It is desirable to operate the engine in a cylinder deactivation mode ("CDA") for purposes such as increasing brake thermal efficiency or improving aftertreatment or exhaust conditions. However, a long-standing obstacle to implementing CDA is the presence of torque and other noise, vibration, and harshness (NVH) beyond the design range of standard working engines and associated equipment. It is desirable to implement a strategy for CDA that can address NVH issues. Contents of the invention [0003] The method disclosed herein overcomes the aforementioned shortcomings and improves upon the art with a stroke strategy for managing resonance during engine operation. [0004] A method is provided for managing a frequency distribution of a force function during operation of a multi-cylinder engine, each cylinder of the engine includin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D17/02F01L13/00
CPCF01L13/00F02D41/1497F01L1/18F01L1/181F01L1/46F02D13/06F02D2041/0012F02D2041/389F02D2200/1004F02D41/0087F02D41/3058F02D41/008Y02T10/12F02D13/0203F02D17/02F02D41/0002F02D41/38
Inventor 黛尔·雅顿·斯特雷奇
Owner EATON INTELLIGENT POWER LTD