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Idle speed control of a powertrain for a hybrid electric vehicle

A technology for a power transmission system and a vehicle, which is applied in the field of devices for controlling the idle speed of the crankshaft, and can solve the problems of difficult control of slow motion performance and the like

Active Publication Date: 2009-08-26
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In powershift transmission vehicle applications, providing stable, acceptable vehicle creep performance can be a difficult control problem due to the absence of a torque converter

Method used

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  • Idle speed control of a powertrain for a hybrid electric vehicle
  • Idle speed control of a powertrain for a hybrid electric vehicle
  • Idle speed control of a powertrain for a hybrid electric vehicle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] first reference figure 1 and 2 The configuration of the power transmission system 10 includes a first power source, such as an internal combustion engine 12 (diesel engine or gasoline engine); a power transmission 14 that can drive multiple forward and reverse gear ratios, such as a wet clutch power shift transmission; An electric machine 16 drivingly connected to the engine crankshaft and transmission input 18, such as an integrated crankshaft starter / generator (CISG) for providing starter / generator capability; and an additional electric machine drivingly connected to the rear axles 22, 23 20, such as Electric Rear Axle Drive (ERAD), to provide additional propulsion capability in electric drive or hybrid drive modes. The transmission output 24 is connected through a final drive unit and a differential mechanism 26 to front axles 28, 30 which drive front wheels 32, 33 respectively. The ERAD 20 drives the rear wheels 34 , 35 through the ERAD transmission 48 , the diffe...

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PUM

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Abstract

In a powertrain that includes wheels for driving a vehicle, a crankshaft, a machine driveably connected to the crankshaft and able to operate alternately as an electric motor and electric generator, a transmission including an input clutch driveably connected to the crankshaft and an output driveably connected to the wheels, a method for controlling idle speed including producing a desired magnitude of input clutch torque capacity, producing a desired wheel torque, using an error represented by a difference between a desired crankshaft idle speed and a current crankshaft speed to determine a desired change in torque produced by the machine, using the magnitude of input clutch torque capacity and the desired change in torque produced by the machine to determine a desired magnitude machine torque, and using the machine to produce said desired magnitude of machine torque.

Description

technical field [0001] The present invention generally relates to an apparatus and method for controlling crankshaft idle speed during slow vehicle motion conditions in a hybrid electric vehicle (HEV). Background technique [0002] A powershift transmission is a gear mechanism that uses two input clutches for producing multiple gear ratios in forward drive and reverse drive. It transmits power continuously using synchronized clutch-to-clutch shifts. [0003] The variator incorporates gearing arranged between the variator input and its output in a double countershaft configuration. One input clutch transmits torque between the transmission input and the first countershaft associated with the even numbered gears; the other input clutch transmits torque between the transmission input and the second countershaft associated with the odd numbered gears. The transmission produces a ratio change by alternating the following steps: engaging the first input clutch and operating at t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60W10/02B60W10/08B60W10/06B60W10/26B60W20/00
CPCY02T10/6286Y02T10/6226B60W2540/10B60W2520/10B60W2540/12B60W10/06B60W2510/244B60W10/02B60W2710/0666B60W2710/065F02D41/1497B60K6/485B60W2710/027Y02T10/6265B60W2720/30B60W30/18063B60W10/08B60Y2400/428B60L2240/441B60W2540/165B60L2240/423F02D41/083F02D2250/18B60K6/442B60L2240/486B60W2510/0216B60W2710/083B60W20/00B60W2710/105F02D2041/1409B60K1/02B60K6/52Y02T10/6234B60W10/26B60W2710/0644Y02T10/642B60W2510/0638Y02T10/62Y02T10/64B60W2050/0011B60W10/04F02D41/16B60W20/10B60W30/18072
Inventor 伊哈勃·S·索里曼安德鲁·J·西尔韦里迪帕克·阿斯瓦尼
Owner FORD GLOBAL TECH LLC
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