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CN-121973795-A - AMT commercial vehicle weight rapid calculation method

CN121973795ACN 121973795 ACN121973795 ACN 121973795ACN-121973795-A

Abstract

The invention relates to a vehicle weight calculation method, in particular to an AMT commercial vehicle weight rapid calculation method, aiming at solving the problems of narrow application range, insufficient precision or complex steps of the existing vehicle weight calculation method. The method comprises the steps of 1) obtaining mu, R, R, i 0 、η、r 1 and mu x , 2) driving an AMT commercial vehicle, 3) obtaining first acceleration a 0 , 4) obtaining second acceleration a 1 , clamping force F 1 of a front wheel of the vehicle, clamping force F 2 of a rear wheel of the vehicle and slip rate delta x of the front wheel and the rear wheel, 5) calculating braking force F r1 of a hydraulic retarder acting on the rear wheel, effective braking force F fa1 provided by a brake and maximum braking force F fa2 provided by a road surface, 6) calculating braking force F fa actually provided by the road surface, and 7) calculating vehicle weight m of the AMT commercial vehicle by utilizing the braking force F fa actually provided by the road surface, second acceleration a 1 and first acceleration a 0 and adopting Newton's second law. The invention effectively utilizes the parameters of speed change, comprehensive braking force and the like when the vehicle brakes, thereby reversely pushing and estimating the vehicle weight.

Inventors

  • CAI ZILIN
  • Deng Jingzhe
  • ZHANG SIYUAN
  • PAN JIANBIN
  • WANG MENG
  • YANG ZIXUAN

Assignees

  • 陕西法士特齿轮有限责任公司

Dates

Publication Date
20260505
Application Date
20251222

Claims (5)

  1. 1. The method for rapidly calculating the vehicle weight of the AMT commercial vehicle is characterized by comprising the following steps of: Step 1, acquiring a friction coefficient mu between a brake disc and a brake pad of an AMT commercial vehicle, an effective braking radius R of the brake disc, an effective rolling radius R of front and rear wheels, a speed ratio i 0 of a main speed reducer of a drive axle, comprehensive transmission efficiency eta and a radius R 1 of the rear wheels of the vehicle, setting a test environment, and acquiring a road surface adhesion coefficient mu x ; Step 2, starting an AMT commercial vehicle in a test environment; Step 3, after running for a certain period of time, releasing an accelerator pedal, and then stepping on a brake pedal to start braking of the AMT commercial vehicle, wherein an output shaft rotation speed sensor of the AMT gearbox acquires the rotation speed at the moment before stepping on the brake pedal and transmits data to the TCU, and the TCU calculates a first acceleration a 0 at the moment; Step 4, calculating a second acceleration a when generating stable braking force 1 Step 4.1, completely clamping a brake disc and a brake pad of the AMT commercial vehicle, and when stable braking force is just generated, acquiring the rotating speed at the moment by an output shaft rotating speed sensor of the AMT gearbox and transmitting data to a TCU, and calculating a second acceleration a 1 at the moment by the TCU; Step 4.2, a retarder control module obtains a braking torque T of the hydraulic retarder at the moment, an ABS control module obtains a clamping force F 1 of a front wheel of the vehicle at the moment, a clamping force F 2 of a rear wheel of the vehicle and a slip rate delta x of the front wheel and the rear wheel of the vehicle, and data are transmitted to a TCU; Step 5, calculating an effective braking force F fa1 provided by a brake and a maximum braking force F fa2 provided by a road surface by using a braking torque T of a hydraulic retarder, a clamping force F 1 of a front wheel of a vehicle, a clamping force F 2 of a rear wheel of the vehicle and a slip rate delta x of the front wheel and the rear wheel of the vehicle; Step 6, the TCU calculates the braking force F fa actually provided by the road surface by utilizing the effective braking force F fa1 provided by the brake and the maximum braking force F fa2 provided by the road surface; And 7, the TCU calculates the vehicle weight m of the AMT commercial vehicle by utilizing the braking force F fa , the second acceleration a 1 and the first acceleration a 0 actually provided by the road surface and adopting Newton's second law, and the quick calculation of the vehicle weight of the AMT commercial vehicle is completed.
  2. 2. The AMT commercial vehicle weight rapid calculation method according to claim 1, characterized in that: The step 5 is specifically as follows: Step 5.1, the TCU calculates and obtains the braking force F r1 of the hydraulic retarder acting on the rear wheels by utilizing the braking moment T of the hydraulic retarder, the speed ratio i 0 of the main speed reducer of the drive axle, the radius r 1 of the rear wheels of the vehicle and the comprehensive transmission efficiency eta; Step 5.2, the TCU calculates an effective braking force F fa1 provided by a brake by utilizing a braking force F r1 acted on a rear wheel by a hydraulic retarder, a clamping force F 1 of a front wheel of the vehicle, a clamping force F 2 of a rear wheel of the vehicle, an effective rolling radius R of the front wheel and the rear wheel, a friction coefficient mu between a brake disc and a brake pad and an effective braking radius R of the brake disc; And 5.3, calculating the maximum braking force F fa2 provided by the road surface by the TCU by using the slip rate delta x of the front and rear wheels, the road surface adhesion coefficient mu x and the road surface adhesion coefficient and slip rate function F.
  3. 3. The AMT commercial vehicle weight rapid calculation method according to claim 2, characterized in that: In step 5.1, the braking force F r1 of the hydrodynamic retarder on the rear wheels is calculated by the following formula: ; In step 5.2, the calculation formula of the effective braking force F fa1 provided by the brake is: ; in step 5.3, the maximum braking force F fa2 that the road surface can provide is calculated by the following formula: 。
  4. 4. The AMT commercial vehicle weight rapid calculation method as defined in claim 3, further comprising: In step 6, the calculation formula of the braking force F fa actually provided by the road surface is as follows: ; where min represents the minimum value of a set of values.
  5. 5. The rapid calculation method of the AMT commercial vehicle weight according to claim 4, wherein: In step 7, the vehicle weight m is calculated by the following formula: 。

Description

AMT commercial vehicle weight rapid calculation method Technical Field The invention relates to a vehicle weight calculation method, in particular to a vehicle weight rapid calculation method of an AMT commercial vehicle. Background The load (vehicle weight) of the whole vehicle is a key control input quantity in a gear shifting rule of the heavy commercial vehicle, and interpolation correction can be carried out on gears according to dynamic loads. Taking an AMT commercial vehicle as an example, two parameters of vehicle weight and road adhesion coefficient are needed to be integrated when the AMT commercial vehicle runs on different roads, so as to judge a gear shifting logic, and a corresponding gear shifting strategy and a gear shifting rotating speed point are adopted accordingly. For example, the full load working condition adopts sequential gear shifting, the gear shifting point is higher, the no-load working condition adopts gear jump gear shifting, and the gear shifting point is relatively lower. Therefore, the change of the load of the vehicle is mastered in real time, and the method has important significance for guaranteeing the smoothness, economy and dynamic performance of the whole vehicle. In view of this, there are many methods for calculating the weight of a vehicle, for example, by using components such as an acceleration sensor, but the accuracy of the measured weight of the vehicle is not high enough, and some vehicles are not equipped with an acceleration sensor, so that the weight of the vehicle cannot be calculated by using the acceleration sensor, and thus the application range of the method is narrow. The comparison document CN117261919A discloses a commercial vehicle weight calculation method, a device and a storage medium, wherein traction force and acceleration are calculated through running parameters of a commercial vehicle, the traction force, the running resistance and the acceleration are used for calculating the vehicle weight at adjacent moments, the running resistance at the adjacent moments is obtained to be consistent, a vehicle weight approximate value is obtained, a recursive least square system equation is constructed through the vehicle weight approximate value, the acceleration difference at the adjacent moments and the traction force difference at the adjacent moments, a forgetting factor recursive least square algorithm is used for recursion, at least three independent vehicle weight rough estimation values are obtained, the independent vehicle weight rough estimation values meeting the requirements are used for calculating the previous vehicle weight average value, and the current vehicle weight rough estimation value is used for weighting and calculating the current vehicle weight fine estimation value. The comparison document CN114889618A discloses a method, a system, equipment and a readable storage medium for decoupling the gradient and the vehicle weight of an AMT (automated mechanical transmission) of a commercial vehicle, wherein the method, the system, the equipment and the readable storage medium are used for acquiring the running data of the whole vehicle when the vehicle runs normally, setting a delay value at a first moment, acquiring a gradient signal through a Kalman algorithm, acquiring a vehicle weight signal through the gradient signal through a least square method, and carrying out weighting calculation on the vehicle weight signal to acquire final vehicle weight information. However, the two comparison documents have the disadvantage of complex calculation steps. Disclosure of Invention The invention aims to solve the problems of narrow application range, insufficient precision or complex steps of the existing vehicle weight calculation method, and provides a method for quickly calculating the vehicle weight of an AMT commercial vehicle. In order to achieve the above purpose, the technical solution provided by the present invention is: The AMT commercial vehicle weight rapid calculation method is characterized by comprising the following steps of: Step 1, acquiring a friction coefficient mu between a brake disc and a brake pad of an AMT commercial vehicle, an effective braking radius R of the brake disc, an effective rolling radius R of front and rear wheels, a speed ratio i 0 of a main speed reducer of a drive axle, comprehensive transmission efficiency eta and a radius R 1 of the rear wheels of the vehicle, setting a test environment, and acquiring a road surface adhesion coefficient mu x; Step 2, starting an AMT commercial vehicle in a test environment; Step 3, after running for a certain period of time, releasing an accelerator pedal, and then stepping on a brake pedal to start braking of the AMT commercial vehicle, wherein an output shaft rotation speed sensor of the AMT gearbox acquires the rotation speed at the moment before stepping on the brake pedal and transmits data to the TCU, and the TCU calculates a first acceleration a 0 at th