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Author

Linlin Wang

Bio: Linlin Wang is an academic researcher from Jilin University. The author has contributed to research in topics: Retarder & Axle. The author has an hindex of 4, co-authored 8 publications receiving 27 citations.

Papers
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Patent
10 Feb 2016
TL;DR: In this paper, a commercial automobile semi-trailer braking force distribution method based on feedback control is presented. But the method aims at dynamically distributing the breaking force of all axles of a commercial vehicle braking system in real time according to the wheel slip ratio.
Abstract: The invention discloses a commercial automobile semitrailer braking force distribution method based on feedback control. The method aims at dynamically distributing the breaking force of all axles of a commercial automobile semitrailer braking system in real time according to the wheel slip ratio. The control method comprises the steps that a braking intention of a driver is judged according to a multidimensional Gaussian hidden Markov model, and identified ideal target braking deceleration is transmitted to a braking force distribution controller; the controller conducts layered feedback control over the wheel slip ratio and the vehicle braking deceleration by combining a current vehicle state, the purpose of dynamically adjusting the braking pressure from the single wheel level and the whole vehicle level is achieved, and therefore the braking efficiency and the stability of a commercial automobile semitrailer are improved.

11 citations

Patent
03 Feb 2016
TL;DR: In this article, a method for optimizing braking force distribution of an integrated braking system of a commercial vehicle according to working conditions is presented, which has the advantages that the braking response speed of the braking system is increased, the temperature rise of the brakes under the downhill working condition is reduced, the service life of each friction liner is prolonged, accidents are avoided, the safety under various braking working conditions was improved, the serviced life of the friction brake and the service-life of the eddy current retarder are prolonged, the maintenance frequency was reduced, and the economical performance was
Abstract: Disclosed is a method for optimizing braking force distribution of an integrated braking system of a commercial vehicle according to working conditions. The method for optimizing braking force distribution of a front axle friction brake, a rear axle friction brake and an eddy current retarder is provided for the commercial vehicle equipped with an air pressure electric control braking system and the eddy current retarder, and the difference of the requirements of the emergency braking working condition, the long slope downhill braking working condition and other ordinary braking working conditions for the braking response speed, the braking distance, the brake temperature and the friction liner abrasion uniformity is taken into consideration, so that different control targets and different braking force distribution strategies are adopted according to different braking working conditions. The method has the advantages that the braking response speed of the braking system is increased, the temperature rise of the brakes under the downhill working condition is reduced, the service life of each friction liner is prolonged, accidents are avoided, the safety under various braking working conditions is improved, the service life of each friction brake and the service life of the eddy current retarder are prolonged, the maintenance frequency is reduced, and the economical performance is improved.

5 citations

Patent
23 Mar 2016
TL;DR: In this paper, a heavy-duty combination vehicle parameter estimation method was proposed to estimate the road slope, the whole vehicle mass and the location of the center of mass online in real time according to the environment sensing device information and sensor information of a heavy duty combination vehicle.
Abstract: The invention discloses a heavy-duty combination vehicle parameter estimation method The method aims at estimating the road slope, the whole vehicle mass and the location of the center of mass online in real time according to the environment sensing device information and sensor information of a heavy-duty combination vehicle According to the method, the influence on slope estimation precision of the pitch angle is sufficiently considered, and the real road slope is obtained by subtracting the pitch angle, calculated by an air spring height sensor, of a motor tractor from the estimated road slope calculated according to the environment sensing device information; according to mass estimation, the influence on slope resistance and air resistance is sufficiently considered, the air resistance is estimated as the unknown quantity, and the estimation precision is improved; according to electric control air braking system pressure sensor information, the location of the center of mass is estimated

5 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, the authors investigate the hysteresis characteristics of a pneumatic braking system for multi-axle heavy vehicles (MHVs) and show that the delay of each loop gets longer with the increase of pedal opening, and a quadratic relationship exists between them.
Abstract: This study aims to investigate the hysteresis characteristics of a pneumatic braking system for multi-axle heavy vehicles (MHVs). Hysteresis affects emergency braking performance severely. The fact that MHVs have a large size and complex structure leads to more nonlinear coupling property of the pneumatic braking system compared to normal two-axle vehicles. Thus, theoretical analysis and simulation are not enough when studying hysteresis. In this article, the hysteresis of a pneumatic brake system for an eight-axle vehicle in an emergency braking situation is studied based on a novel test bench. A servo drive device is applied to simulate the driver’s braking intensions normally expressed by opening or moving speed of the brake pedal. With a reasonable arrangement of sensors and the NI LabVIEW platform, both the delay time of eight loops and the response time of each subassembly in a single loop are detected in real time. The outcomes of the experiment show that the delay time of each loop gets longer with the increase of pedal opening, and a quadratic relationship exists between them. Based on this, the pressure transient in the system is fitted to a first-order plus time delay model. Besides, the response time of treadle valve and controlling pipeline accounts for more than 80% of the loop’s total delay time, indicating that these two subassemblies are the main contributors to the hysteresis effect.

16 citations

Journal Article
TL;DR: In this article, a new approach is presented to achieve the braking force distribution strategy for articulated vehicles, defined as an innovative braking forces distribution strategy, is based on the wheel slips.
Abstract: Improvement in braking performance and vehicle stability can be achieved through the use of braking systems whose brake force distribution is variable. Electronic braking force distribution has an important and serious role in the vehicle stopping distance and stability. In this paper a new approach will be presented to achieve the braking force distribution strategy for articulated vehicles. For this purpose, the mathematical optimization process has been implemented. This strategy, defined as an innovative braking force distribution strategy, is based on the wheel slips. The simulation results illustrate proposed strategy can significantly improve the vehicle stability in curved braking for different levels of vehicle deceleration

12 citations

Patent
12 Nov 2019
TL;DR: In this article, the authors proposed an automatically adjusted electric vehicle staged automatic emergency braking control system, which consists of vehicle-mounted distance measuring and speed measuring sensor equipment, a staged pre-warning control system and a safety distance calculation model.
Abstract: The invention relates to an automatically adjusted electric vehicle staged automatic emergency braking control system. The automatically adjusted electric vehicle staged automatic emergency braking control system comprises vehicle-mounted distance measuring and speed measuring sensor equipment, a staged pre-warning control system, a safety distance calculation model, a vehicle reverse longitudinaldynamic calculation model, a hydraulic braking force and regenerative braking force distribution and calculation module, a hydraulic braking system reverse model, an ESC and Booster active pressurizing hydraulic pressure distribution module and a pavement information estimation module; potential safety hazards such as rear-end collision of a rear vehicle caused by great sudden deceleration of a vehicle are reduced while the comfort during triggering an AEB system is improved; by estimating information, such as gradients and adhesion coefficients, of a current running road and a front road ofthe vehicle and controlling online adjusting of parameters, the adapting degree of the AEB system to different pavement statuses is enhanced, the braking energy is sufficiently recycled, the endurancemileage is increased, and the advantages of a vehicle body stability control system ESC and an electronic mechanical braking booster in active pressurizing are sufficiently developed.

10 citations

Patent
15 Jun 2016
TL;DR: In this paper, the authors proposed a method and system for calculating the total mass of a vehicle and aimed to solve the technical problem of low calculation accuracy of the vehicle's total mass.
Abstract: The invention particularly relates to a method and system for calculating the total mass of a vehicle and aims to solve the technical problem of low calculation accuracy of the total mass of the vehicle. The method comprises the following steps of: S10, establishing a relation function F1 between the output power Pm of a motor and the total mass m, rolling resistance coefficient f, air resistancecoefficient CD and windward area A of the vehicle when the vehicle runs at a constant speed; S12, establishing a relation function F2 between the output power Pa of the motor and the total mass m, rolling resistance coefficient f, air resistance coefficient CD and windward area A of the vehicle when the vehicle accelerates or climbs; S14, establishing a relation function F3 between a difference value delta P of the output power of the motor and the total mass m of the vehicle by combining the relation function F1 and the relation function F2; S16: determining the total mass m of the vehicle through obtaining the output power difference delta P of the motor by looking up a table. According to the method, by eliminating the rolling resistance coefficient f, the air resistance coefficient CDand the windward area A, the calculation accuracy of the total mass of the vehicle is improved.

7 citations

Patent
03 Aug 2018
TL;DR: In this article, a long-downgrade self-adaptive retarder for a passenger vehicle and a control device and a method thereof was proposed to realize the accurate braking torque compensation of the retarder.
Abstract: The invention discloses a long-downgrade self-adaptive retarder for a passenger vehicle and a control device and method thereof The method comprises the steps that 1, current driving road informationof the passenger vehicle is detected; 2, a downgrade gradient, and a self-vehicle gear and a current vehicle speed of the passenger vehicle are detected, and the safe and stable speed and the safetyspeed of each level of the passenger vehicle under the current gear are obtained; 3, a corresponding braking mode is determined, and the retarder is controlled to automatically turned on and a corresponding retarder gear is selected; 4, after the retarder is turned on, a retarder excitation current is adjusted to realize accurate braking torque compensation of the retarder; and 5, the vehicle speed of the passenger vehicle is continuously detected in the braking process, and if the vehicle speed is less than or equal to the safe and stable speed of the passenger vehicle at the current gear andthe gradient, the retarder is turned off The long-downgrade self-adaptive retarder for the passenger vehicle and the control device and method thereof realize the accurate braking torque compensation of the retarder, complete the deceleration process with higher braking efficiency, and ensure that the passenger vehicle can safely and effectively complete the braking and deceleration downgrade

6 citations