Transit vehicle dynamic brake control apparatus
AssigneeWestinghouse Electric Corp.
InventorArun P. Sahasrabudhe
Life of this patent
Estimating the term…
Abstract
The present invention relates to an improved dynamic brake effort control apparatus for use with loads such as a transit vehicle, and which provides a better control of and blending of dynamic brake effort and friction brake effort in relation to the vehicle speed for the improved braking control of the transit vehicle.
Claims12
In brake control apparatus for a vehicle having a motor and mechanical friction brakes, said apparatus being responsive to a total tractive effort signal, a vehicle speed signal and a motor armature current signal, the combination of
- means establishing a determined dynamic brake effort signal in response to the vehicle speed signal and the motor armature current signal,
- means establishing a brake effort reduction signal in response to the vehicle speed signal,
- means operative with said motor and establishing a dynamic brake effort control signal in accordance with the difference between said total tractive effort signal and said brake effort reduction signal for controlling the dynamic brake effort of the vehicle, and
- means operative with said mechanical friction brakes and establishing a mechanical brake effort control signal in accordance with the difference between said total tractive effort signal and said determined dynamic brake effort signal for controlling the mechanical friction brakes.
In brake control apparatus for a vehicle having a motor and mechanical friction brakes, said apparatus being responsive to a total tractive effort signal, a vehicle speed signal and a motor armature current signal, the combination of
- first means responsive to the vehicle speed signal and the motor armature current signal for providing a determined dynamic brake effort signal,
- second means responsive to the vehicle speed signal for providing a brake effort modification signal,
- third means responsive to the total tractive effort signal and the determined dynamic brake effort signal for controlling one of the dynamic brake effort of the motor and the mechanical friction brakes, and
- fourth means responsive to the total tractive effort signal and the brake effort modification signal for controlling the other of the dynamic brake effort of said motor and the mechanical friction brakes.
In brake control apparatus for a transit vehicle having a motor with a dynamic brake circuit, said apparatus being responsive to a tractive effort signal, the vehicle speed and the motor current, the combination of
- means responsive to the motor current for providing a first signal having each of a predetermined offset and a desired linear relationship with the motor current,
- means responsive to said first signal and the vehicle speed for providing a second signal in accordance with each of a predetermined exponential of the first signal and an inversely proportional relationship to the vehicle speed, and
- means operative with the motor for establishing a dynamic brake effort control signal in accordance with the difference between the tractive effort signal and the second signal for controlling the dynamic brake effort of the vehicle.
Dependencies are inferred from the claim text.