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Reducing nosie, vibration and harshness in a variable displacement engine

An engine and braking mechanism technology, applied in the direction of engine control, machine/engine, mechanical equipment, etc., can solve problems such as reducing fuel economy

Active Publication Date: 2010-01-20
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, under certain operating conditions, when the vehicle is operating above a threshold torque, the vehicle may not experience NVH, but this can cause multiple cylinders in the engine to be activated unnecessarily, further reducing fuel economy

Method used

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  • Reducing nosie, vibration and harshness in a variable displacement engine
  • Reducing nosie, vibration and harshness in a variable displacement engine
  • Reducing nosie, vibration and harshness in a variable displacement engine

Examples

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Embodiment Construction

[0017] The vehicle system described herein has an engine with cylinder deactivation and electronic vehicle stability control, where an acceleration sensor provides information both for activating / deactivating cylinders of the engine and for controlling the vehicle to maintain stability during various operations . For example, one or more vehicle brakes may be automatically controlled using yaw sensor information to reduce the vehicle's roll tendency during cornering conditions. In addition, sensor information (after bandpass filtering) can also be used to identify engine vibrations during cylinder deactivation conditions. Based on these identified operating conditions, the engine may be controlled to restart one or more cylinders to mitigate the detected vibrations. In this way, a common acceleration sensor can be used to improve two separate applications. Additionally, sensor information may be used to inhibit deactivation of one or more cylinders if engine operation is uns...

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PUM

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Abstract

The invention relates to reducing nosie, vibration and harshness in a variable displacement engine, especially a method for operating an engine of a vehicle. The engine having one or more deactivatable cylinders, the method including controlling the stability of a vehicle in response to vehicle acceleration, and reactivating or deactivating combustion in at least a cylinder in response to vehicle acceleration. The invention can reduce nosie, vibration and harshness in a variable displacement engine, meanwhile, can operating the engine to use less cylinders in a range-widening condition thereby enhancing vehicle fuel efficiency.

Description

technical field [0001] The present invention relates to variable displacement engines, in particular to systems and methods for reducing noise, vibration and harshness of variable displacement engines. Background technique [0002] Engines operating with variable numbers of active cylinders or deactivated cylinders may be used to improve fuel economy while maintaining the air-fuel ratio of the overall exhaust mixture near stoichiometric, optionally through cylinder valve deactivation. Engines capable of deactivating multiple cylinders are commonly referred to as variable displacement engines (VDE). Deactivating the cylinders may include disabling fuel injection and / or valve actuation in the cylinders. In some examples, half of the engine cylinders may be deactivated under selected operating conditions. Selected operating conditions can be defined by parameters such as speed / load windows, as well as various other operating conditions including vehicle speed. Increasing the...

Claims

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Application Information

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IPC IPC(8): F02D41/00F02D17/02F02D13/06
CPCF02D41/10F02D41/0087F02D2250/21F02D2250/28
Inventor 托马斯·G·利昂唐纳德·J·刘易斯侯塞因·苏加丽亚曾弘德
Owner FORD GLOBAL TECH LLC
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