公开(公告)号：EP4335721A1

公开(公告)日：2024-03-13

申请号：EP22194669.2

申请日：2022-09-08

申请人： Dellner Bubenzer AB

发明人： PRIM, Viktor

IPC分类号： B61L15/00 ,  B61K9/08 ,  B61L23/04

摘要： A rail vehicle (100) obtains a basic parameter (µ) reflecting an initial value of a friction coefficient (µ e ) relating to a rail segment (310) in a rail-way network (300) and validates the basic parameter (µ) through a procedure involving: measuring individual rotational speeds (ω 1 , ω 2 , ω 3 , ω 4 ) of the axels to which the wheels (151, 152, 153, 154) of the rail vehicle (100) are connected while applying a gradually increasing traction force (AF) to a specific one of said axles; determining, while applying the gradually increasing traction force (AF), an absolute difference between the rotational speed (ω 2 ) of the specific one of said axles and an average rotational speed of said axles except the specific one of said axles; and in response to the absolute difference exceeding a threshold value deriving a parameter (µ m ) reflecting a measured value of the friction coefficient (µ e ); checking whether the measured value of the friction coefficient (µ e ) lies within an acceptance interval from the basic parameter (µ); and if so, assigning the validated value of the friction coefficient equal to the measured value of the friction coefficient (µ e ). Then, a friction data message (M)(µe)) is emitted that contains the validated value of the friction coefficient.

公开(公告)号：EP4331927A1

公开(公告)日：2024-03-06

申请号：EP22193702.2

申请日：2022-09-02

申请人： Dellner Bubenzer AB

发明人： PRIM, Viktor ,  LENNARTSSON, Svante

IPC分类号： B60T8/17 ,  B60T8/172 ,  B60T17/22 ,  B60T8/18 ,  B60T8/32

摘要： An overall weight (m tot ) of a rail vehicle (100) is estimated by obtaining a power signal (P m ) indicating an amount of power produced by a set of drive units (101, 102, 103) to accelerate the rail vehicle (100) between first and second speeds (v 1 ; v 2 ). Then, the following steps are executed: (a) obtaining wheel speed signals indicating respective rotational speeds (ω 1 , ω 2 , ω 3 ) of the wheel axles in the driving subset of the wheel axles (131, 132, 133); (b) producing an acceleration control signal (A1) to a specific drive unit (101) in the set of drive units such that this drive unit applies a gradually increasing traction force to a specific wheel axle (131) of the wheel axles in the driving subset of the wheel axles (131, 132, 133); (c) repeatedly determining, during production of the acceleration control signal (A1), an absolute difference (|ω 1 - ω a |) between the rotational speed of the specific wheel axle (131) and an average rotational speed (ω a ) of the wheel axles (132, 133) in the driving subset of the wheel axles except the specific wheel axle; and in response to the absolute difference (|ω 1 - ω a |) exceeding a threshold value; (d) determining a parameter (µ m ) reflecting a friction coefficient (µ e ) between a pair of wheels (121a, 121b) on the specific wheel axle (131) and a pair of rails (191, 192) upon which the rail vehicle (100) travels. Steps (a) to (c) are repeated for each of the wheel axles in the driving subset of the wheel axles, and based thereon, a respective fraction (m 1 , m 2 , m 3 ) of the overall weight (m tot ) carried by each of wheel axles in the driving subset of the wheel axles (131, 132, 133) is estimated.