System and method for controlling traction
First Claim
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1. A traction control system for a machine having an electric drive configuration, comprising:
- an electric motor associated with at least one wheel and adapted to provide braking torque to the wheel; and
a controller configured to;
determine a rotational speed of the at least one wheel;
compare the rotational speed to an allowable slide threshold, wherein the allowable slide threshold is based on a ground speed of the machine, wherein the allowable slide threshold is a percentage of the ground speed of the machine; and
adjust the braking torque to the at least one wheel during retarding if the rotational speed is less than the allowable slide threshold.
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Abstract
A traction control system for a machine having an electric drive configuration is disclosed. The traction control system includes an electric motor associated with at least one wheel and adapted to provide braking torque to the wheel. The control system further includes a controller configured to determine a rotational speed of the at least one wheel, compare the rotational speed to an allowable slide threshold, and adjust the braking torque to the at least one wheel during retarding if the speed is less than the allowable slide threshold.
11 Citations
16 Claims
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1. A traction control system for a machine having an electric drive configuration, comprising:
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an electric motor associated with at least one wheel and adapted to provide braking torque to the wheel; and a controller configured to; determine a rotational speed of the at least one wheel; compare the rotational speed to an allowable slide threshold, wherein the allowable slide threshold is based on a ground speed of the machine, wherein the allowable slide threshold is a percentage of the ground speed of the machine; and adjust the braking torque to the at least one wheel during retarding if the rotational speed is less than the allowable slide threshold. - View Dependent Claims (2, 3, 4, 5)
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6. A method for controlling traction of a machine having an electric drive configuration, comprising:
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determining a retarding mode of operation for the machine; determining a rotational speed of at least one wheel of the machine during the retarding mode; determining a ground speed of the machine during the retarding mode; comparing the rotational speed to an allowable slide threshold, wherein the allowable threshold is based on the ground speed, wherein the allowable slide threshold is a percentage of the ground speed; and adjusting a braking torque provided by an electric motor to the at least one wheel if the rotational speed is less than the allowable slide threshold. - View Dependent Claims (7, 8, 9, 10)
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11. An electric drive machine, comprising:
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a first wheel; a first motor operating to rotate the first wheel about a first axis relative to the machine; a first sensor disposed to measure a speed of the first wheel relative to the machine; a speed sensor disposed to measure the speed of the machine relative to the ground; a controller operatively connected to the first motor, the first sensor, and the speed sensor;
the controller configured to;determine a rotational speed of the first wheel based on information from the first sensor; determine a ground speed of the machine based on information from the speed sensor; determine a slide threshold value based on the ground speed, wherein the slide threshold value is a percentage of the ground speed; compare the rotational speed with the threshold value; and when the rotational speed is less than the threshold value, adjust a torque command to the first motor such that the rotational speed exceeds the threshold value. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification