초록 ▼

A controlled stop system for an AC electric locomotive includes a braking effort control circuit responsive to a braking command regulating braking effort produced by AC traction motors coupled in driving relationship to wheels of the locomotive. The control circuit is responsive to a vehicle speed

A controlled stop system for an AC electric locomotive includes a braking effort control circuit responsive to a braking command regulating braking effort produced by AC traction motors coupled in driving relationship to wheels of the locomotive. The control circuit is responsive to a vehicle speed signal for adjusting motor operation to maintain braking effort to about zero speed. A filter processes the speed signal before application to the braking effort control circuit such that the control circuit operates as a speed regulator at zero speed to maintain the vehicle in a stopped condition.

대표청구항 ▼

[ What is claimed:] [1.] A controlled stop system for an AC electric traction motor propelled vehicle, the vehicle including at least one inverter coupled between a DC link and at least one AC motor, a control means responsive to a braking effort command for controlling the conduction timing of each

[ What is claimed:] [1.] A controlled stop system for an AC electric traction motor propelled vehicle, the vehicle including at least one inverter coupled between a DC link and at least one AC motor, a control means responsive to a braking effort command for controlling the conduction timing of each of a plurality of switching devices forming an operative function of the inverter wherein the conduction timing of the switching devices is effective to control the magnitude and direction of power flow between the DC link and the motor, the system comprising:a braking effort control circuit responsive to a braking command for establishing a conduction timing pattern of the switching devices in the inverter to regulate braking effort produced by the motor, said control circuit including means responsive to a vehicle speed signal for adjusting the switching device conduction timing pattern to maintain braking effort to about zero speed; andfilter means for processing the vehicle speed signal before application to said braking effort control circuit wherein said control circuit operates as a speed regulator at zero speed to maintain the vehicle in a stopped condition.