Derating vehicle electric drive motor and generator components

摘要

A machine propelled by an electric motor and subject to a deration scheme is described wherein deration is specified by a combination of a temperature signal indicating a degree to which a machine component is overheating. The machine includes an electronic controller that receives a temperature signal indicative of a current temperature status of the electric motor. The electronic controller receives a motor speed signal indicative of a current speed status of the electric motor. The electronic controller calculates, in accordance with a derating scheme, a deration value for the electric motor, the deration value being determined by applying a set of current operating state parameter values to the derating scheme. The set of current operating state parameters include: a motor speed parameter value; and a temperature parameter value.

主权项

1. A machine propelled by an electric motor, the machine comprising:
a drive wheel connected to a rotating interface of the electric motor for operating at least in a propel mode wherein the electric motor delivers rotational force to the drive wheel; an electronic controller configured with computer executable instructions for performing the steps of:
receiving a temperature signal indicative of a current temperature status of the electric motor;receiving a motor speed signal indicative of a current speed status of the electric motor;calculating, in accordance with a derating scheme, a deration value for the electric motor, the deration value being determined by applying values of a set of current operating state parameters to the derating scheme, the set of current operating state parameters comprising:
a motor speed parameter having a value derived from the motor speed signal; anda temperature parameter having a value derived from temperature signal wherein, during the calculating step, the deration value specifies a torque limit for the electric motor when the current speed status corresponds to a low motor speed range, wherein, during the calculating step, the deration value specifies a power limit for the electric motor when the current speed status corresponds to a high motor speed range, and wherein, during the calculating step, the deration value is a constant, non-zero, value over a specified range for the temperature parameter value.