Slip-limiting control for rail vehicles

Claim 3

A method according to claim 1, comprising: eliminating the slipping between said driving wheel and said rail as a function of a limit value of the change with time of the acceleration of the wheel periphery (d 2 v/dt 2 ) of at least one driving wheel being exceeded; and using the change with time of the acceleration of the wheel periphery of the driving wheel having the smallest peripheral wheel speed (d 2 v min /dt 2 ) for detecting whether the limit is being exceeded.

Claim 4

A method according to claim 2, comprising: eliminating slipping by rapidly reducing the driving current of only one driving machine, that being the driving machine of the driving wheel which is rearmost in the direction of motion.

Claim 5

A slip-limiting control device for a rail vehicle having at least two driving machines, wherein each driving machine includes a slip-limiting controller which controls the speed of at least one wheel, driven by the driving machine, as a function of the difference between a peripheral wheel speed derived from a driving axle of the driving machine, and a presettable nominal slip value, and at least one speed summing section, comprising: a short-term period signal generator for generating a slip-reduction signal, said slip-reduction signal effectively connected, during one short-term period, to the speed summing section of at least one of said slip-limiting controllers, in order to reduce the peripheral wheel speed of the associated driving wheel, the peripheral wheel speed being reduced during this short-term period to such an extent that said driving wheel no longer slips on said rail; a long-term period signal generator for generating a speed reference signal (v ref ) which has during a presettable long-term period a value which rises very slowly; said long-term period signal generator having an output coupled to an input of the speed summing section in such a way as to produce a reduction in the peripheral wheel speed; and means for rapidly bringing said speed reference signal v ref to a minimum speed value, v min if v ref ≠v min , where v min is equal to the wheel circumferential speed of the slowest driving wheels, where v ref =v min is maintained until a further shipping occurs.

Claim 6

A slip-limiting control device for a rail vehicle having at least two driving machines, wherein each driving machine includes a slip-limiting controller which controls the speed of at least one wheel, driven by the driving machine, as a function of the difference between a peripheral wheel speed derived from a driving axle of the driving machine, and a presettable nominal slip value, and at least one speed summing section, comprising: a short-term period signal generator for generating a slip-reduction signal, said slip-reduction signal effectively connected, during one short-term period, to the speed summing section of at least one of said slip-limiting controllers, in order to reduce the peripheral wheel speed of the associated driving wheel, the peripheral wheel speed being reduced during this short-term period to such an extent that said driving wheel no longer slips on said rail; a long-term period signal generator for generating a speed reference signal (v ref ) which has during a presettable long-term period a value which rises very slowly; said long-term period signal generator having an output coupled to an input of the speed summing section in such a way as to produce a reduction in the peripheral wheel speed; and means for rapidly bringing said speed reference signal v ref to a minimum speed value, v min if v ref ≠v min , where v min is equal to the wheel circumferential speed of the slowest driving wheels, where v ref =v min is maintained until a further shipping occurs.

Claim 7

A slip-limiting control device according to claim 4, comprising: a jolt detector for detecting the amount of change with time of the acceleration (d 2 v min /dt 2 ) of the wheel periphery, said jolt detector having an input supplied with at least one peripheral wheel speed signal of at least one driving wheel of the rail vehicle; a jolt threshold section coupled to an output of said jolt detector, said threshold section having a presettable jolt threshold and producing an output coupled to the short-term period signal generator when said presettable jolt threshold is exceeded; and a minimum value section having inputs supplied with plural peripheral wheel speed signals from plural respective driving wheels of the rail vehicle and an output at which said minimum speed signal (v min ) is present, said output of said minimum value section coupled to said input of the jolt detector.

Claim 8

A slip-limiting control device according to claim 5, comprising: said short-term period signal generator comprising a proportional-integral controller which generates the slip-reduction signal as a function of a short-term period signal, said short term signal being enabled as a function of the output of the jolt threshold section; and said short-term period signal having a duration of less than or equal to 3 s.

Claim 9

A slip-limiting control device according to claim 6, wherein said long-term period signal generator comprises: a mono-stable flip-flop which generates a long-term period signal with a presettable long-term period as a function of the short-term period signal, said long-term period being about 25 s; and an integrator which generates the speed reference signal as a function of said long-term period signal, said integrator having an input supplied with the minimum speed signal (v min ), said minimum speed signal being present as the speed reference signal (v ref ) at the output of the integrator if no long-term period signal is present, and said minimum speed signal (v min ) being the upper limit for the speed reference signal (v ref ) if said long-term period signal is present.

Claim 10

A slip-limiting control device according to claim 7, comprising: said speed summing section connected via a "+" input to the peripheral wheel speed signal of the driving wheel associated with the speed controller, via a "-" input to a presettable slip-limit speed signal (v o ), via another "-" input to the speed reference signal (v ref ), and via another "-" input to the slip reduction signal; said speed summing section connected via a maximum value section having a reference value "0" to a "-" input of a current summing section, which is supplied via another "-" input with an actual current value signal of the associated driving machine and via a "-" input with a nominal current value signal; and the output of the current summing section connected via a current control to a static converter for supplying the driving machine with power.