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Powersplit powertrain for a hybrid electric vehicle

A power system and engine technology, which is applied to the layout of multiple different prime movers of hybrid vehicles, general power plants, motor vehicles, etc., to achieve the effect of reducing torque demand, reducing torque holes, and reducing torque demand

Active Publication Date: 2014-12-17
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has been found that this results in a large "torque hole" reduction in output shaft torque when the engine is started

Method used

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  • Powersplit powertrain for a hybrid electric vehicle
  • Powersplit powertrain for a hybrid electric vehicle

Examples

Experimental program
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Effect test

Embodiment Construction

[0015] First refer to figure 1 , the HEV powertrain 10 includes: a power source such as an internal combustion engine 12, such as a diesel or gasoline engine; a planetary gear set 14; a first electric machine 16, commonly referred to as an electric motor; a countershaft transmission 18; a differential 20; a second electric machine 22 , known as a generator; and a countershaft 24 drivably connected to the differential 20 .

[0016] Although by convention the electric machine 16 is sometimes referred to as an electric motor or traction motor, and the electric machine 22 is sometimes referred to as a generator, each electric machine 16, 22 is a motor-generator and can be operated as a motor or a generator as desired.

[0017] A sun gear 27 of the planetary gear set 14 is fixed to a rotor 28 of an electric machine 22 (generator). Carrier 32 of planetary gear set 14 is connected to engine 12 via torsional vibration damper 34 and shaft 36 . Ring gear 39 of gearset 14 is driveably ...

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PUM

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Abstract

A powertrain includes a planetary gearset including an input connected to a shaft driveably connected to an engine, a second input driveably connected to an electric machine, and an output driveably connected to a countershaft, a clutch for releaseably connecting the countershaft and the input shaft through a first pair of meshing gears, and a brake for releaseably holding the input shaft and the input against rotation.

Description

technical field [0001] The present invention generally relates to a powersplit powertrain for a hybrid vehicle. Background technique [0002] The power system of a hybrid electric vehicle (HEV) includes an engine, at least one electric machine that can act as a motor / generator, and a traction battery, wherein the engine and the electric machine can drive wheels separately, and the engine can be driven by the electric machine that operates as a generator to The traction battery is charged, and by powering the electric motor to act as a generator to recharge the battery, vehicle kinetic energy can be recovered and regenerated during deceleration. [0003] The power split powertrain provides good fuel economy during city driving, but also has adverse consequences during highway driving due to negative split operation. Using the clutch to ground the generator does not produce the optimum speed ratio of the engine under normal highway driving conditions. [0004] The power spli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60K6/445B60K6/365
CPCB60K6/547Y10S903/902B60K6/365B60K6/387B60K6/445B60K2006/381Y02T10/62Y02T90/14
Inventor 约瑟夫 杰拉尔德 苏皮纳
Owner FORD GLOBAL TECH LLC
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