Fluid-pressure and analogous brake systems – Multiple fluid-receiving devices – Multiple motors
Reexamination Certificate
2003-01-10
2004-05-25
Butler, Douglas C. (Department: 3683)
Fluid-pressure and analogous brake systems
Multiple fluid-receiving devices
Multiple motors
C303S152000, C188S159000, C318S371000
Reexamination Certificate
active
06739675
ABSTRACT:
FIELD OF THE INVENTION
The present invention generally relates to a brake effort monitor software logic program in a microprocessor system. More particularly, the invention relates to a brake effort monitor software logic program in a microprocessor system designed to maximize dynamic brake effort and evaluate dynamic and friction braking systems for optimal braking performance in a transit vehicle and the total blended brake monitoring optimization of dynamic and friction brake systems.
BACKGROUND OF THE INVENTION
There is presently known in the prior art, typically on transit vehicles, the use of a combination of dynamic braking and friction braking to bring the transit vehicle to a stop. It is advantageous to use dynamic braking preferentially over friction braking because dynamic braking is “free” or actually saves money. The reason being is that there are no wearing parts involved with dynamic braking and when regenerative brake is used, which is basically electricity generated by the vehicle that can be used by other vehicles, thereby producing an overall energy savings. On the other hand, friction braking causes wear of the brake shoes or pads and also requires energy to produce the air or hydraulic pressure required to generate the braking forces.
Typically on transit vehicles in the prior art, the dynamic brake and the friction brake are controlled independently, and the amount of braking for each brake system is not monitored during normal operation. The dynamic brake system operates with no information regarding the operation of the friction brake system.
Therefore, when dynamic brake is not fully utilized, operation costs increase. If the combined brake system is not performing as designed, the resultant wear in over friction braking can be costly. Under braking of the dynamic effort results in higher friction brake wear. Under braking in the entire brake system can result in longer stop distances than required. Over braking on dynamic braking or friction braking can result in increased system wear and possible wheel/rail damage due to higher brake rates. Over braking may cause wheel slide or locking conditions which could result in longer stop distances than required.
SUMMARY OF THE INVENTION
In one aspect, the present invention provides a brake effort monitor for railcar braking systems. The brake effort monitor includes a means connected to receive a brake effort request signal and a vehicle speed signal for generating an energy requested signal. There is a means connected to receive a brake effort actual signal and the vehicle speed signal for generating an actual energy signal. A means is connected to receive an energy requested signal and add it to one of a previous energy requested signal and a predetermined value for generating an energy requested sum signal. The brake effort monitor of the present invention also includes a means connected to receive an actual energy signal and add it to one of a previous actual energy signal and a predetermined value for generating an actual energy sum signal. A comparison means is connected to receive an energy requested sum signal and an actual energy sum signal for generating a performance comparison signal. Finally, the brake effort monitor of the present invention further includes a storage means connected to receive at least one of an energy requested sum signal and an actual energy sum signal and a performance comparison signal for storing at least one of these signals.
In another aspect, the present invention provides a method for monitoring brake effort of railcar braking systems. The method for monitoring brake effort includes the following steps.
Communicating a vehicle speed signal to at least one of a means for calculating energy requested and a means for calculating actual energy. Communicating a brake effort request signal to a device for calculating energy requested and communicating a brake effort actual signal to a means for calculating actual energy.
Then, an energy requested signal is calculated using the brake effort requested and vehicle speed signals communicated in the prior steps and a predetermined time period. Next, an actual energy signal is calculated using the brake effort actual and vehicle speed signals previously communicated and a predetermined time period.
Further, the method includes communicating the energy requested signal calculated to a means for calculating an energy requested sum. It also includes communicating the actual energy signal calculated to a means for calculating an actual energy sum.
There is calculated an actual energy sum signal using the actual energy signal communicated and one of a previously communicated actual energy sum signal and a predetermined value in absence of a previously communicated actual energy sum signal. Further, the present invention calculates an energy requested sum signal using the energy requested signal communicated and one of a previously communicated energy requested sum signal and a predetermined value in absence of a previously communicated energy requested sum signal.
Next, the method includes communicating the energy requested sum signal calculated and the actual energy sum signal calculated to a means for calculating a performance comparison. Then calculation of a performance comparison signal using the energy requested sum signal communicated and the actual energy sum signal communicated is performed. Included in the method is communication of at least one of a energy requested sum signal calculated and a actual energy sum signal calculated and a performance comparison signal calculated to a means for storing at least one signal. Finally, the present invention stores at least one of an energy requested sum signal communicated and an actual energy sum signal communicated and a performance comparison signal calculated.
OBJECTS OF THE INVENTION
It is, therefore, one of the primary objects of the present invention to provide a brake effort monitor which uses a software logic based program to monitor transit vehicle brake effort amounts.
Another object of the present invention is to provide a brake effort monitor which uses a software logic based program for storing in memory the monitored requested and actual brake effort amounts with a time and date stamp.
Yet another object of the present invention is to provide a brake effort monitor which uses a software logic based program for comparing the performance factor of dynamic braking and friction braking to optimize total transit vehicle braking.
Still another object of the present invention is to provide a brake effort monitor which uses a software logic based program data to ensure the dynamic braking usage is maximized and translates into cost savings over time.
Yet another object of the present invention is to provide a brake effort monitor which uses a software logic based program for monitoring the performance of Total Brake Effort (Actual Effort/Requested Effort).
A further object of the present invention is to provide a brake effort monitor which uses a software logic based program for monitoring actual dynamic (electric) brake effort supplied over time.
Still another object of the present invention is to provide a brake effort monitor which uses a software logic based program for monitoring actual friction brake effort supplied over time.
A still further object of the present invention is to provide a brake effort monitor which uses a software logic based program for monitoring total dynamic and friction brake effort supplied over time.
Still another object of the present invention is to provide a brake effort monitor which uses a software logic based program for evaluating the performance of a brake system using actual energy supplied and the requested energy supplied.
Although a number of objects and advantages of the present invention have been described in some detail above, various additional objects and advantages of the software logic based program for the brake effort monitor of the present invention will become more readily apparent to those persons who are skilled in the
Dewberry James T.
Scharpf Robert N.
Schweikert David E.
Butler Douglas C.
James Ray & Associates
Nguyen Xuan Lan
Westinghouse Air Brake Technologies Corporation
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