Method and system for a dual speed accessory gear for an engine

A technology of transmission belt and rotation speed, which is applied in the direction of engine starting, multi-gear ratio transmission, engine components, etc., can solve the problems of shortened service life, electromagnetic clutch transmission torque disturbance, low-efficiency wear, etc., and achieves NVH reduction, driving Experience smooth, reduced torque disturbance

Pending Publication Date: 2022-07-19
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the inventors herein have recognized a problem with this solution, where the engagement and disengagement of the electromagnetic clutch can create driveline torque disturbances
Driveline torque disturbances can lead to increased noise, vibration and harshness (NVH), negatively impacting vehicle performance and the driving experience of the vehicle's driver
Additionally, the inefficiency of engagement and disengagement of electromagnetic clutches may increase wear on the clutches and other associated parts of the vehicle, whereby the service life of the clutches and other associated parts may be shortened and the cost of maintaining the TSAD may increase

Method used

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  • Method and system for a dual speed accessory gear for an engine
  • Method and system for a dual speed accessory gear for an engine
  • Method and system for a dual speed accessory gear for an engine

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Embodiment Construction

[0016] The following description relates to operating a hybrid vehicle such as figure 1 A system and method for one or more belt drive front end attachment devices of a hybrid electric vehicle (HEV). A hybrid vehicle may include a multi-cylinder internal combustion engine, where figure 2 An exemplary embodiment of one cylinder of a multi-cylinder internal combustion engine is shown. Multiple front-end accessory devices (such as water pumps, air conditioning (A / C) compressors, etc., each with a corresponding front-end accessory drive (FEAD)) can be driven via belts and pulleys (such as including one-way clutches and Two-speed accessory drive (TSAD) system of planetary gear sets) coupled to the crankshaft of the engine, such as Figure 4 depicted in. also, image 3 An example planetary gear set is shown. In a first mode of operation, the TSAD can drive the belt in a 1:1 ratio to power the FEAD, as controlled by a one-way clutch, as in Figure 5A shown, and in the second m...

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Abstract

Methods and systems for a two speed accessory transmission for an engine are provided. Methods and systems are provided for engaging and disengaging an electromagnetic clutch of a two-speed accessory transmission of an engine of a vehicle. In one example, a method includes, in response to an electrical demand above a threshold electrical demand, operating an electric machine of the vehicle in motor mode to reduce a speed of a ground gear of a planetary gear set of a two speed accessory transmission (TSAD) of the vehicle; and engaging an electromagnetic clutch in response to the speed of the ground gear reaching a clutch engagement threshold speed.

Description

technical field [0001] The present application generally relates to systems and methods for two-speed accessory transmissions for internal combustion engines. Background technique [0002] Front end accessory devices of the vehicle, such as alternators, air conditioner compressors, power steering pumps, water pumps, etc., may be mounted on the front of the vehicle's engine. Each front attachment device may include a front attachment drive (FEAD) that powers the front attachment device. The drive pulley may be coupled to the crankshaft of the engine and further coupled to the FEAD of the front end attachment through a drive belt and an auxiliary pulley, forming a system that powers the front end attachment via the crankshaft. Powering the FEAD via the drive pulley represents parasitic losses, whereby the efficiency of the engine decreases and the fuel consumption of the vehicle increases. Also, as engine speed increases, efficiency losses may be greater. For example, as en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60K6/387B60K6/365B60K6/547B60K6/485B60W30/20B60W10/08B60W10/06B60W10/02B60W20/15
CPCB60K6/387B60K6/365B60K6/547B60K6/485B60W30/20B60W10/08B60W10/06B60W10/02B60W20/15B60W2030/203B60K25/00B60K2025/022B60K25/02F02N11/04F02B67/06F02N15/08F02N15/022F02N15/046F02N15/02B60Y2200/92F16H2200/0034F16H3/54F16H2200/2005F16H2200/2035F16H2200/2066F16H2200/2082Y02T10/62B60W20/13B60W10/115F16H2200/2007B60W20/40B60W20/30B60W2510/305B60W2710/081B60W2710/1005
Inventor T·沃恩大卫·奥德乔治·帕帕约安努约瑟夫·莱尔·托马斯J·布雷维克
Owner FORD GLOBAL TECH LLC
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