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Wobble compensation of an encoder speed signal for an electric motor

An encoder and speed encoder technology, applied in the field of jitter compensation, can solve problems such as not representing the rotation speed of the traction motor

Active Publication Date: 2015-03-04
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to some physical irregularities, the encoder model does not represent the true traction motor rotation speed

Method used

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  • Wobble compensation of an encoder speed signal for an electric motor
  • Wobble compensation of an encoder speed signal for an electric motor
  • Wobble compensation of an encoder speed signal for an electric motor

Examples

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Embodiment Construction

[0011] Referring to the drawings, wherein like reference numerals correspond to like or similar components throughout the several views, figure 1 Vehicle 10 is shown with transmission 14 . The vehicle may be configured as a battery electric vehicle or a hybrid electric vehicle capable of being propelled using the traction motor 16 in an electric-only (EV) mode. Although for the sake of brevity the figure 1 While one traction motor 16 is shown, those skilled in the art will understand that other vehicle embodiments may include additional motors, for example, a motor directly connected to the output of the transmission 14 .

[0012] Vehicle 10 includes a control system 50 having a hybrid control processor (HCP) 20 and a motor control processor (MCP) 30 . As understood by those skilled in the art, an HCP such as HCP 20 coordinates the input to the transmission 14 based on the current hybrid operating strategy. Inputs may include the internal combustion engine 12 and one or mor...

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PUM

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Abstract

A vehicle includes a traction motor, a transmission, a speed encoder for the motor, and a control system. The control system compensates for angular wobble in an encoder signal. The control system receives, via a hybrid control processor (HCP), the encoder signal from the speed encoder, and determines a set of wobble characteristics of the encoder signal below a threshold motor speed. The control system also calculates a wobble-compensated speed value via the HCP using the wobble characteristics, and uses the wobble-compensated speed value as at least part of the input signals when controlling the motor. A lookup table tabulates a learned wobble value relative to the angular position value, and a learned wobble value is subtracted from a current angular wobble value to generate an error-adjusted wobble value. A method compensates for wobble in the encoder signal using the above control system.

Description

technical field [0001] The invention relates to wobble compensation of an encoder speed signal of the type used to measure the rotational speed of an electric motor. Background technique [0002] Battery electric vehicles, extended-range electric vehicles and hybrid electric vehicles all use rechargeable high-voltage batteries as their power source. One or more high voltage electric motors alternately draw power from and provide power to the battery during vehicle operation. The powertrain operating mode is generally referred to as an electric-only (EV) mode when the vehicle is propelled using only electric power from the battery. Depending on the vehicle design, additional operating modes may include fixed gear modes and electrically variable transmission (EVT) modes in which the internal combustion engine is used to generate at least a portion of the torque required to propel the vehicle. [0003] Within a hybrid vehicle control architecture, a speed encoder measures the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60L15/08H02K11/00G01P3/481
CPCY10T477/33Y10T477/23Y02T10/7258B60L3/0038Y10T477/328B60L2240/12Y02T10/642G01P3/489B60L2240/421Y02T10/64Y02T10/72
Inventor R.L.莫里斯
Owner GM GLOBAL TECH OPERATIONS LLC