US 2019/0160965 A1Published application

Control system for controlling operation of a drive motor

AssigneeCaterpillar Inc.

InventorsBrian D. Kuras, Sangameshwar Sonth, Arkit Sharma

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Abstract

A control system for controlling operation of a drive motor includes an input device for providing a command signal that is indicative of a desired speed and direction of rotation of the drive motor. A sensor is associated with the drive motor and adapted to provide a sensor signal indicative of current rotational speed of the drive motor. A controller receives the command signal, and determine whether the command signal is indicative of a desired zero speed to be associated with the drive motor. The controller also receives the sensor signal, and determine whether the current rotational speed of the drive motor is within a pre-defined range of difference from the desired zero speed. The controller then generates a de-rated torque command signal having a reduced gain factor, and reduce the current rotational speed of the drive motor based on the de-rated torque command signal.

Claims17

Dependent claims

A control system for controlling operation of a drive motor, the control system comprising:

an input device configured to receive a command signal from a user, the command signal being indicative of a desired speed and direction of rotation of the drive motor;
a sensor associated with the drive motor and adapted to provide a sensor signal indicative of current rotational speed associated with the drive motor;
a controller disposed in communication with each of the input device, the sensor, and the drive motor, the controller configured to:
receive the command signal from the input device;
determine from the input device whether the command signal is indicative of a desired zero speed to be associated with the drive motor;
receive the sensor signal from the sensor;
determine from the sensor signal whether the current rotational speed of the motor is within a pre-defined range of the desired zero speed;
monitor the output speed of the drive motor, and if the output speed of the motor is not zero, generate a de-rated torque command signal having a reduced gain factor;
and
reduce the current rotational response of the drive motor based on the de-rated torque command signal.

7 more elements

A machine comprising:

a drive motor configured to rotatively drive a load;
an input device configured to receive a command signal from a user, the command signal being indicative of a desired speed and direction of rotation of the drive motor;
a sensor associated with the drive motor and adapted to provide a sensor signal indicative of current rotational speed and direction of rotation associated with the drive motor;
a controller disposed in communication with each of the input device, the sensor, and the drive motor, the controller configured to:
receive the command signal from the input device;
determine from the input device whether the command signal is indicative of a desired zero speed to be associated with the electric motor;
receive the sensor signal from the sensor;
determine from the sensor signal whether the current rotational speed of the motor is within a pre-defined range of the desired zero speed;
monitor the output speed of the drive motor, and if the output speed of the motor is not zero, generate a de-rated torque command signal having a reduced gain factor;
and
reduce the current rotational response of the drive motor based on the de-rated torque command signal.

8 more elements

A method for controlling operation of a drive motor, the method comprising:

providing, by means of an input device, a command signal from a user, the command signal being indicative of a desired speed and direction of rotation of the drive motor;
generating, by means of a sensor associated with the drive motor, a sensor signal indicative of current rotational speed associated with the drive motor;
receiving, by means of a controller, the command signal from the input device,
determining, by means of the controller, whether the command signal is indicative of a desired zero speed to be associated with the drive motor,
receiving, by means of the controller, the sensor signal from the sensor,
determining from the sensor signal, by means of the controller, whether the current rotational speed of the drive motor is within a pre-defined range from the desired zero speed,
monitoring, by means of the controller, the output speed of the drive motor, and if the output speed of the motor is not zero, generating, by means of the controller, a de-rated torque command signal having a reduced gain factor, and
reducing, by means of the controller, the current rotational response of the drive motor based on the de-rated torque command signal.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/827,272Filed 30 Nov 2017
Published: 30 May 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification16 codes

B60L 15/2009
For control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed: for braking
B60L 15/20
Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles: for control of the vehicle or its…
E02F 9/207
Control of propulsion units: of the type electric propulsion units, e.g. electric motors or generators
B60L 2200/40
Type of vehicles: working vehicles