US 7,937,194 B2Granted

System and method for reducing wheel slip and wheel locking in an electric vehicle

AssigneeOshkosh Corporation

InventorsNader Nasr, Peter Werner

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Abstract

A method of reducing wheel slip and wheel locking in an electric traction vehicle includes receiving in a first controller a first signal value representative of a first amount of torque to be applied to at least one wheel of the electric traction vehicle by a motor coupled to the wheel and to the first controller, and a second signal value representative of a reference speed of the electric traction vehicle. The first and second signal values are generated by a second controller in communication with the first controller. The method also includes receiving in the first controller a third signal value representative of a speed of the at least one wheel, determining in the first controller a torque output signal using the first, second, and third signal values; and transmitting the torque output signal from the first controller to the motor.

Claims34

Dependent claims

A method of reducing wheel slip and wheel locking in an electric traction vehicle comprising:

providing by a second controller a first signal value representative of a first amount of torque to a plurality of motor controllers including a first controller, each of the plurality of motor controllers controlling one of a plurality of motors, each of the plurality of motor controllers coupled to one of a plurality of wheels;
for each of the plurality of motor controllers, including the first controller, performing the following steps:
receiving in the first controller the first signal value representative of a first amount of torque to be applied to the wheel by the motor coupled to the wheel and to the first controller, and a second signal value representative of a reference speed of the electric traction vehicle, wherein the first and second signal values are generated by the second controller in communication with the first;
receiving in the first controller a third signal value representative of a speed of the wheel;
comparing the second signal and the third signal in a speed controller of the first controller to determine whether the wheel is slipping and whether the wheel is locking;
determining in the first controller a torque output signal using the first, second, and third signal values, wherein the torque output signal is less than the first signal value if the wheel is slipping, and wherein the torque output signal is greater than the first signal value if the wheel is locking;
transmitting the torque output signal from the first controller to the motor;
and
applying an amount of torque to the wheel based on the torque output signal.

6 more elements

An electric traction vehicle comprising:

a vehicle controller configured to determine a first torque value and a reference speed value;
a first motor drive controller coupled to a first electric motor and in communication with the vehicle system controller;
and
a second motor drive controller coupled to a second electric motor and in communication with the vehicle system controller;
wherein the first motor drive controller is configured to determine a second torque value using the reference speed value and a speed of a first wheel coupled to the first electric motor, and to transmit a first torque output signal representative of one of the first torque value and the second torque value, the first torque output signal being determined such that the reference speed provides an upper limit for the speed of the first wheel if the first wheel is slipping and such that the reference speed provides a lower limit for the speed of the first wheel if the first wheel is locking;
wherein the second motor drive controller is configured to determine a third torque value using the reference speed value and a speed of a second wheel coupled to the second electric motor, and to transmit a second torque output signal representative of one of the first torque value and the third torque value, the second torque output signal being determined such that the reference speed provides an upper limit for the speed of the second wheel if the second wheel is slipping and such that the reference speed provides a lower limit for the speed of the second wheel if the second wheel is locking;
wherein the first electric motor is configured to provide a first amount of torque to the first wheel based on the first torque output signal, and wherein the second electric motor is configured to provide a second amount of torque to the second wheel based on the second torque output signal.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/236,421Filed 27 Sep 2005 · us provisional application
Priority: 27 Sep 2004
Published: US 2006/0106521 A118 May 2006
Granted: 3 May 2011
Term ends: Not estimatedThe source records don’t support an estimate.

Classification20 codes

B60W 10/08
Including control of propulsion units: including control of electric propulsion units, e.g. motors or generators
B60K 6/46
Characterised by the architecture of the hybrid electric vehicle: series type
B60L 3/06
Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy…:…
B60L 3/10
Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy…:…