Simplified pattern recognition wheel slide protection
First Claim
1. A wheel slip control system for modulating brake application forces being applied to a passenger transit type railway vehicle having a plurality of axles on which wheels are mounted, said wheel slip control system comprising:
- (a) a first means disposed on said railway vehicle and connected to at least receive a set of first signals indicative of a speed for each of said axles and a set of second signals indicative of an acceleration rate for each of said axles for both processing said set of first signals and said set of second signals and for generating a set of third signals indicating, for each of said axles, when said wheels are slipping;
(b) a second means connected to receive at least said set of first signals indicative of said speed for each of said axles and said set of second signals indicative of said acceleration rate for each of said axles and said set of third signals indicating, for each of said axles, when said wheels are slipping for generating a set of fourth signals indicating an energy loss due to a wheel slip for each of said axles;
(c) a third means connected to receive at least said set of fourth signals indicating said energy loss due to said wheel slip for each of said axles for generating a set of fifth signals indicative of a wheel slip enable timeout value for each of said axles;
(d) a fourth means connected to receive at least said set of fifth signals indicative of said wheel slip enable timeout value for both generating a set of sixth signals indicative of a time of a wheel slip correction and for generating a set of seventh signals for ending a wheel slip correction when said time indicated by one of said set of sixth signals reaching said timeout value indicated by one of said set of fifth signals for each of said axles;
(e) a fifth means connected to receive at least said set of seventh signals for ending said wheel slip correction, said fifth means reapplying said brake application forces to said railway vehicle.
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Accused Products
Abstract
This invention provides method and apparatus for an improved pattern recognition wheel slide protection system for passenger transit type railway vehicles. It receives as inputs the rotational velocities of all the axles on the vehicle, and the acceleration rates for the axles. It also receives signals for brake cylinder pressure. The system uses the velocity and acceleration data to determine whether the wheels on an axle are slipping, and determines the severity of the slip. It calculates a timeout value based on the severity of the slip, and times a slip correction until the timeout value is reached, whereupon the slip correction is terminated. The system uses a simplified logic for providing brake control signals. A cascade logic method is used in which the brake control signal starts out indicating full application, then, based on signals indicating change in sign of acceleration rate, and acceleration rate in excess of a predetermined value, changes the brake control signal to pulsed brake application. Further indications based on axle velocity and acceleration cause the signal to change to a hold signal, then to a release pulse signal, and finally to a signal for release. This cascaded logic provides signals for brake valve control which have five values, APPLY, APPLY PULSE, HOLD, RELEASE PULSE, and RELEASE. Information obtained from axle rate signals is also used to specify for the RELEASE PULSE mode the duration of release and the duration of hold.
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Citations
16 Claims
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1. A wheel slip control system for modulating brake application forces being applied to a passenger transit type railway vehicle having a plurality of axles on which wheels are mounted, said wheel slip control system comprising:
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(a) a first means disposed on said railway vehicle and connected to at least receive a set of first signals indicative of a speed for each of said axles and a set of second signals indicative of an acceleration rate for each of said axles for both processing said set of first signals and said set of second signals and for generating a set of third signals indicating, for each of said axles, when said wheels are slipping; (b) a second means connected to receive at least said set of first signals indicative of said speed for each of said axles and said set of second signals indicative of said acceleration rate for each of said axles and said set of third signals indicating, for each of said axles, when said wheels are slipping for generating a set of fourth signals indicating an energy loss due to a wheel slip for each of said axles; (c) a third means connected to receive at least said set of fourth signals indicating said energy loss due to said wheel slip for each of said axles for generating a set of fifth signals indicative of a wheel slip enable timeout value for each of said axles; (d) a fourth means connected to receive at least said set of fifth signals indicative of said wheel slip enable timeout value for both generating a set of sixth signals indicative of a time of a wheel slip correction and for generating a set of seventh signals for ending a wheel slip correction when said time indicated by one of said set of sixth signals reaching said timeout value indicated by one of said set of fifth signals for each of said axles; (e) a fifth means connected to receive at least said set of seventh signals for ending said wheel slip correction, said fifth means reapplying said brake application forces to said railway vehicle. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A wheel slip control system for modulating brake application forces on a passenger transit type railway vehicle having a plurality of axles on which wheels are mounted, said wheel slip control system comprising:
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(a) a first means disposed on said railway vehicle and connected to receive at least a set of first signals indicative of a speed for each of said axles and a set of second signals indicative of an acceleration rate for each of said axles for both identifying a time when wheel slip is not occurring and for generating a third signal for normalization enable when said wheel slip is not occurring; (b) a second means connected to receive said set of first signals indicative of said speed for each of said axles and said third signal for said normalization enable for generating a set of fourth signals indicative of normalization factors which are dependent upon relative wheel diameter calculated from relative axle velocities for each of said axles on said railway vehicle during said time when said third signal for said normalization enable indicates that said wheel slip is not occurring; (c) a third means connected to receive said set of first signals indicative of axle speeds and said set of fourth signals indicative of said normalization factors for generating a set of fifth signals indicative of normalized axle speeds for each of said axles; (d) a fourth means connected to receive said set of second signals indicative of said acceleration rate and said set of fifth signals indicative of said normalized axle speeds for generating a sixth signal for brake valve control based on said set of second signals indicative of said acceleration rate and said set of fifth signals indicative of said normalized axle speed for each of said axles; and (e) a fifth means for processing said sixth signal for said brake valve control through a series of tests based on at least said set of second signals indicative of said acceleration rate and said set of fifth signals indicative of said normalized axle speed, to produce a seventh signal for brake valve control having at least five values, one for full brake application, one for generating a pulsed brake application signal, one for holding brakes, one for generating a pulsed brake release signal and one for releasing brakes; and (f) means for processing said set of second signals indicative of said acceleration rate and said set of fifth signals indicative of said normalized axle speed for each of said axles to generate a signal indicative of a priority for brake force reduction and processing said priority signal to generate a signal for a duration of the pulsed brake release signal and a signal indicative of a waiting time between the pulsed brake release signals. - View Dependent Claims (8)
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9. A process for modulating brake application forces to control wheel slip on a passenger transit type railway vehicle having a plurality of axles on which wheels are mounted, said process comprising the steps of:
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(a) receiving a set of first signals indicative of a speed for each of said axles and a set of second signals indicative of an acceleration rate for each of said axles and processing said set of first signals and said said set of second signals and generating a set of third signals indicating, for each of said axles, when said wheels are slipping; (b) processing at least said set of first signals indicative of said speed for each of said axles, said set of second signals indicative of said acceleration rate for each of said axles and said set of third signals indicating, for each of said axles, when said wheels are slipping, to generate a set of fourth signals indicating an energy loss due to said wheel slip for each of said axles; (c) processing said set of fourth signals indicating said energy loss due to said wheel slip for each of said axles to generate a set of fifth signals indicative of a wheel slip enable timeout value for each of said axles; (d) processing said set of fifth signals indicative of said wheel slip enable timeout value to generate a set of sixth signals indicative of a time of a wheel slip correction and a set of seventh signals for ending said wheel slip correction when said time indicated by one of said set of sixth signals reaching said timeout value indicated by one of said set of fifth signals, for each of said axles; and (e) processing at least said set of seventh signals for ending said wheel slip correction to reapply said brake application forces. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A wheel slip control process comprising the following steps:
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(a) processing at least a set of first signals indicative of a speed for each of said axles and a set of second signals indicative of an acceleration rate for each of said axles to identify a time when wheel slip is not occurring and generating a third signal for normalization enable when said wheel slip is not occurring; (b) processing said set of first signals indicative of said speed, and said third signal for said normalization enable to generate a set of fourth signals indicative of normalization factors which are dependent upon relative wheel diameter based on relative axle velocities for each of said axles on said railway vehicle during said time when said third signal for said normalization enable indicates that said wheel slip is not occurring; (c) processing said set of first signals indicative of said axle speeds and said set of fourth signal, indicative of said normalization factors to generate a set of fifth signals indicative of normalized axle speeds for each of said axles; (d) processing said set of second signals indicative of said acceleration rate for each of said axles and said set of fifth signals indicative of said normalized axle speeds to generate a set of sixth signals for brake valve control for each of said axles; and (e) processing said set of sixth signals for said brake valve control through a series of tests based on at least said set of second signal, indicative of said acceleration rate for each of said axles and said fourth signal indicative of said normalized axle speed to produce a seventh signal for brake valve control having at least five values, one for full brake application, one for generating a pulsed brake application signal, one for holding brakes, one for generating a pulsed brake release signal, and one for releasing brakes; (f) processing said set of second signals indicative of said acceleration rate for each of said axles and said set of fifth signals indicative of said normalized axle speed for each of said axles to generate a signal indicative of a priority for brake force reduction, a signal indicative of a duration of the pulsed brake release signal and a signal indicative of a waiting time between the pulsed brake release signals. - View Dependent Claims (16)
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Specification