CN-118419076-B - Locomotive traction upper limit amplitude limiting method

CN118419076BCN 118419076 BCN118419076 BCN 118419076BCN-118419076-B

Abstract

According to the environmental temperature, the weather state and the track object state, an adhesion coefficient setting value is obtained by adopting a direct reasoning calculation method to adaptively adjust the adhesion coefficient, so that the maximum traction limit of the locomotive can be changed in real time along with the change of road conditions of a road section, and the locomotive traction is carried out under the condition that the wheelset idle running does not occur as much as possible. When the wheel set cannot be prevented from idling, a nonlinear mathematical expression is adopted to calculate an idling risk value according to the creep degree change rate and the creep degree, whether the wheel set idles or not is judged, whether the locomotive traction force after the upper limit limiting control is subjected to idling traction force control is determined according to the idling judgment result, multi-factor comprehensive judgment is realized, and the idling judgment and the idling traction force control are more comprehensive and accurate.

Inventors

YAN QINYUN
LING YUN
CHEN GANG
NIE HUI
TANG CAIZHEN

Assignees

湖南工业大学

Dates

Publication Date: 20260508
Application Date: 20230427

Claims (2)

1. A locomotive traction upper limit limiting method is characterized in that the method is according to the formula Performing upper limit limiting control on locomotive traction, wherein F 1 is locomotive traction before upper limit limiting, F 2 is locomotive traction after upper limit limiting, P μ is calculated adhesion weight of the locomotive, and mu j • P μ is a maximum traction limiting value; The adhesion coefficient mu j is calculated according to Calculating, wherein V is the locomotive speed, a 1 、a 2 、a 3 、a 4 、a 5 is an empirical formula parameter for calculating the adhesion coefficient, and ζ is an adhesion coefficient setting value output by an adhesion coefficient expert control model; Judging whether the locomotive wheel pair idles according to the change rate of the creep degree and the creep degree, and determining whether the locomotive traction after the upper limit limiting control is subjected to idle traction control according to the idle judgment result Calculation is performed, wherein x 1 is the creep degree change rate, theta 1 is the creep degree change rate threshold value, x 2 is the creep degree, theta 2 is the creep degree threshold value, gamma 1 、γ 2 is a nonlinear weighted control factor, and gamma 1 ≥ 10、γ 2 is more than or equal to 10.
2. The locomotive traction upper limit limiting method of claim 1, wherein the adhesion coefficient expert control model infers the environmental temperature, weather state and track adhesion state input in real time and obtains an adhesion coefficient setting value ζ, by: In the first step, when the weather state is snow or light rain and the track object state is snow, the value of ζ 0 is equal to b 0 , when the weather state is medium rain or heavy rain and the track object state is snow, the value of ζ 0 is equal to b 1 , when the weather state is no snow and the track object state is snow, the value of ζ 0 is equal to b 2 , when the weather state is snow or light rain and the track object state is snow, the value of ζ 0 is equal to b 3 , when the weather state is snow or light rain and the track object state is dust, the value of ζ 0 is equal to b 4 , when the track object state is dust, the value of ζ 0 is equal to b 5 , when the track object state is snow, the track object state is no snow, the value of ζ 0 is equal to b 6 , the track object state is medium rain or heavy rain, and the track object state is snow, the value of ζ32 is equal to b 3642, the weather state is snow, the value of ζ3642 is dust, the value of ζ is equal to b 6293, the weather state is medium rain or heavy rain, the weather state is equal to b 368, the condition of no snow, the condition of ζ is clean, the condition of ζ is equal to b 6235, the condition of the track object is no snow, the dust is equal to b 6235, the condition of dust is equal to the clean weather state is equal to b, the condition of the snow, the condition of the dust is no snow, the condition of the dust is equal to be the dust, the dust is equal to b is equal to no flat, the dust, the condition is equal to the dust is equal to b flat b 0 < b 1 < b 2 < b 3 < b 4 ≤ b 5 < b 6 < b 7 ≤ b 8 ≤ b 9 < b 10 ; Second, calculating the setting value of the adhesion coefficient zeta based on the initial setting value of the adhesion coefficient zeta 0 and the measured value of the ambient temperature C 11 , Wherein the ambient temperature measurement C 11 is in units of degrees Celsius and the output is in the range of-15 degrees Celsius to +50 degrees Celsius.

Description

Locomotive traction upper limit amplitude limiting method The invention relates to a patent application, which is a divisional application, the original application number is 202310472883.5, the application date is 2023, 4 and 27 days, and the invention is named as an adhesion control system of an electric locomotive. Technical Field The invention belongs to the technical field of locomotive traction control, and particularly relates to a locomotive traction upper limit limiting method. Background Locomotive (train) operation is realized through interaction between wheel tracks, and the power of a traction motor can be further utilized only on the premise of ensuring effective adhesion between the wheel tracks. The track adhesion characteristics are related not only to the locomotive itself and the track material, but also to a series of uncertainty factors that vary over time, such as line conditions, track surface cleanliness, etc. If the traction force is greater than the available adhesive force between the wheel tracks in the running process of the locomotive, the excessive traction force accelerates the wheels to form idling, the relative sliding speed is increased quickly, the available adhesive force is reduced quickly, the abrasion and even damage of the wheel tracks can be caused, the maintenance cost of railway operation is increased, and the safe running of the locomotive can be threatened. The method comprises the steps of judging the acceleration of wheels, rapidly and deeply reducing the driving torque of the wheels when the acceleration exceeds a certain threshold value and reducing the traction force of the locomotive, judging the creep speed if the acceleration of the wheels does not exceed the threshold value, and greatly adjusting the driving torque when the creep speed exceeds the threshold value, otherwise, judging the normal running condition. In the combined correction method, 2 or more single threshold conditions are adopted to judge whether idling occurs, and when idling does not occur, comprehensive judgment of idling risk cannot be realized, and when idling occurs, comprehensive judgment of idling degree cannot be realized. Disclosure of Invention The invention aims to provide a locomotive traction upper limit limiting method aiming at the defects of the prior art, and the method is as follows And performing upper limit limiting control on locomotive traction, wherein F 1 is locomotive traction before upper limit limiting, F 2 is locomotive traction after upper limit limiting, P μ is calculated adhesion weight of the locomotive, and mu j·Pμ is a maximum traction limiting value. The adhesion coefficient mu j is calculated according to And calculating, wherein V is the locomotive speed, a 1、a2、a3、a4、a5 is an empirical formula parameter for calculating the adhesion coefficient, and ζ is an adhesion coefficient setting value output by an adhesion coefficient expert control model. The adhesion coefficient expert control model is used for reasoning the environmental temperature, the weather state and the track adhesion state which are input in real time and obtaining an adhesion coefficient setting value xi, and the method comprises the following steps: In the first step, when the weather state is snow or light rain and the track object state is snow, the value of ζ 0 is equal to b 0, when the weather state is medium rain or heavy rain and the track object state is snow, the value of ζ 0 is equal to b 1, when the weather state is no snow and the track object state is snow, the value of ζ 0 is equal to b 2, when the weather state is snow or light rain and the track object state is snow, the value of ζ 0 is equal to b 3, when the weather state is snow or light rain and the track object state is dust, the value of ζ 0 is equal to b 4, when the track object state is dust, the value of ζ 0 is equal to b 5, when the track object state is snow, the track object state is no snow, the value of ζ 0 is equal to b 6, the track object state is medium rain or heavy rain, and the track object state is snow, the value of ζ32 is equal to b 3642, the weather state is snow, the value of ζ3642 is dust, the value of ζ is equal to b 6293, the weather state is medium rain or heavy rain, the weather state is equal to b 368, the condition of no snow, the condition of ζ is clean, the condition of ζ is equal to b 6235, the condition of the track object is no snow, the dust is equal to b 6235, the condition of dust is equal to the clean weather state is equal to b, the condition of the snow, the condition of the dust is no snow, the condition of the dust is equal to be the dust, the dust is equal to b is equal to no flat, the dust, the condition is equal to the dust is equal to b flat b0<b1<b2<b3<b4≤b5<b6<b7≤b8≤b9<b10; Second, calculating the setting value of the adhesion coefficient zeta based on the initial setting value of the adhesion coefficient zeta 0 and the measured value of the ambient temperature C 11,