Oscillation sensitive vehicle motor control
AssigneeAllmanna Svenska Elektriska Aktiebolaget
InventorsLars-Olof Nilsson, Bo Soderberg, Fredrik Schmiterlow
Life of this patent
Estimating the term…
Abstract
In a motor-driven rail vehicle, an arrangement is provided for sensing oscillations in the drive system occurring in a predetermined frequency range, and to reduce the torque of the motor if the oscillation amplitude sensed thereby exceeds a predetermined threshold value.
Claims9
In a motor-driven vehicle having at least one drive system which comprises a drive motor and drive wheels;
- in which system the tractive force varies with the difference .DELTA.v between the peripheral speed of the drive wheel and the speed of the vehicle, in which the tractive force reaches a maximum at a value .DELTA.v.sub.2 of said difference and decreases when said difference increases above said value, and in which, when said difference increases above said value, mechanical osciallations occur in the drive system within a certain natural frequency range;
- an oscillation sensing member which includes a means to sense mechanical osciallations in the system within such range and to form a signal corresponding to the amplitude of such osciallations;
- an arrangement for influencing the torque of the motor;
- and
- means to transmit such signal to said arrangement;
- said arrangement including means to reduce partially the torque of the motor in response to oscillations within such natural frequency range.
In a motor-driven vehicle having at least one drive system which comprises a drive motor and drive wheels;
- in which system the tractive force varies with the difference .DELTA.v between the peripheral speed of the drive wheel and the speed of the vehicle, in which the tractive force reaches a maximum at a value .DELTA.v.sub.2 of said difference and decreases when said difference increases above said value, and in which, when said difference increases above said value, mechanical oscillations occur in the drive system within a certain natural frequency range;
- an oscillation sensing member which includes means to sense mechanical oscillations in the system within such range and to form a signal corresponding to the amplitude of such oscillations;
- an indicator;
- and
- means to transmit such signal to said indicator.
A method for controlling the tractive force in a motor-driven vehicle having at least one drive system which comprises a drive motor and drive wheels;
- in which system the tractive force varies with the difference .DELTA.v between the peripheral speed of the drive wheel and the speed of the vehicle, in which the tractive force reaches a maximum at a value .DELTA.v.sub.2 of said difference and decreases when said difference increases above said value, and in which, when said difference increases above said value, mechanical oscillations occur in the drive system within a certain natural frequency range;
- said method comprising
- sensing mechanical oscillations within such range;
- forming a signal corresponding to the amplitude of such oscillations;
- and
- partially reducing the torque of the motor in response to oscillations within such natural frequency range.
Dependencies are inferred from the claim text.