Continuous field control of series wound motors
First Claim
1. An operating method for use in a control system for an electrically driven vehicle for implementing operation in a propulsion mode, a coast mode and an electrical brake mode, said coast mode being distinct from a plug braking mode and simulating the retarding effects of an internal combustion engine driven vehicle, the vehicle being powered by a direct current electric traction motor having an armature and a field winding and including:
- a power source;
a variable mark-space ratio power regulator responsive to a motor current command signal for connecting the power source to the motor in a manner to regulate motor current in the armature and field winding and wherein the current command signal is developed in response to the position of an accelerator;
a direction selection means for providing signals indicative of a desired direction of motion of the vehicle; and
signal processing means responsive to said selection means signal and to the accelerator position and mark-space ratio for establishing the mode of operation of the motor;
said method comprising the steps of;
(a) receiving data indicative of movement of the accelerator from a rest position and a selected direction of motion of the vehicle;
(b) establishing a mark-space ratio for the regulator responsive to accelerator position for establishing operation in the propulsion mode;
(c) sensing data representative of return of the accelerator to a rest position; and
(d) transitioning the motor operation to the coast mode in response to return of the accelerator to the rest position.
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Accused Products
Abstract
A method for operating an electronic control system for an operator controlled, electrically driven vehicle. The vehicle being powered by a direct current electric traction motor. The electronic control system includes a power source, a variable mark-space ratio power regulator responsive to a motor current command signal developed in response to the position of an accelerator, a direction selection means for providing signals indicative of the direction of motion of the vehicle, and a braking signal responsive to brake position. The electronic control system implements operation of the motor automatically in a propulsion mode, a regenerative mode, and a plug mode. The propulsion mode is either a series connected mode or a separately excited mode. The regenerative mode simulates the retarding effects of an internal combustion engine driven vehicle, while recover the kinetic energy of the vehicle by the generation of current to recharge the power source. The regenerative mode includes a regenertive coast mode and a regenerative brake mode. The plug mode provides a greater retarding force than the regenerative mode. The plug mode includes a plug coast mode and a plug brake mode.
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Citations
30 Claims
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1. An operating method for use in a control system for an electrically driven vehicle for implementing operation in a propulsion mode, a coast mode and an electrical brake mode, said coast mode being distinct from a plug braking mode and simulating the retarding effects of an internal combustion engine driven vehicle, the vehicle being powered by a direct current electric traction motor having an armature and a field winding and including:
- a power source;
a variable mark-space ratio power regulator responsive to a motor current command signal for connecting the power source to the motor in a manner to regulate motor current in the armature and field winding and wherein the current command signal is developed in response to the position of an accelerator;
a direction selection means for providing signals indicative of a desired direction of motion of the vehicle; and
signal processing means responsive to said selection means signal and to the accelerator position and mark-space ratio for establishing the mode of operation of the motor;
said method comprising the steps of;(a) receiving data indicative of movement of the accelerator from a rest position and a selected direction of motion of the vehicle; (b) establishing a mark-space ratio for the regulator responsive to accelerator position for establishing operation in the propulsion mode; (c) sensing data representative of return of the accelerator to a rest position; and (d) transitioning the motor operation to the coast mode in response to return of the accelerator to the rest position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
- a power source;
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18. A method for braking an operator controlled electric traction motor propelled vehicle of the type including, a power source, a time-ratio power regulator which is controlled to be conducting and non-conducting for connecting and disconnecting the motor to a direct-current power source in response to the relative position of an accelerator, a direction positioning means for controlling the direction of the vehicle, a signal processing means for controlling switching means, the switching means controlling the operation of the motor, a sensing means for providing signals representative of currents within field and armature windings of the motor, a braking means for providing signals representative of a brake position, said method comprising the steps of:
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(a) receiving data, the data including the position of the accelerator, the direction of motion of the vehicle, and the conducting and nonconducting time ratio interval; (b) setting the switching means in response to the position of the accelerator and the selected direction of motion of the vehicle; and (c) changing the switching means in response to release of the accelerator for implementing a first relatively low level of electrical braking of the vehicle distinct from a plug braking mode. - View Dependent Claims (19, 20, 21, 22)
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23. In a control system for a direct current traction motor having armature and field windings, the control system being of the type including a variable mark-space ratio power regulator, an accelerator and signal processing means responsive to accelerator position for supplying current command signals to the regulator, switching means for establishing connection of the motor in one of a series propulsion mode and a separately excited propulsion mode, the switching means being operated by the signal processing means in response to predetermined desired operating characteristics of the motor, and a power source, a method for switching between the series mode and separately excited mode comprising the steps of:
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(a) sensing the mark-space ratio of the regulator; (b) transitioning from a series mode to a separately excited mode when the mark-space ratio exceeds a predetermined value; (c) determining the magnitude of motor current just prior to transitioning; and (d) increasing the magnitude of field current above the determined magnitude of motor current immediately after transitioning whereby the magnitude of armature current is prevented from increasing above a determined magnitude at the time of transitioning. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30)
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Specification