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Minimizing Disturbance Detection Time in Hydraulic Systems

General Motors LLC-Paul Otanez, Ramadityanand Bhogadi
  • Technical Paper
  • 2020-01-0263
To be published on 2020-04-14 by SAE International in United States
In a hydraulic system, parameter variation, contamination, and/or operating conditions can lead to instabilities in the pressure response. The resultant erratic pressure profile produces reduced performance that can lead to hardware damage. Specifically, in a transmission control system, the inability to track pressure commands can result in various types of slip and disturbances to the driveline. Therefore, it is advantageous to identify such pressure events and take remedial actions. The challenge is to detect the condition in the least amount of time while minimizing false alarms. In this study, cross and auto-correlation techniques are evaluated for the detection of pressure disturbances. The performance of the detectors is measured in terms of speed of detection and robustness to: 1) measurement noise, and 2) disturbance parameter uncertainty (frequency and amplitude). The implications in terms of computations and memory utilization of implementing the detectors in real-time embedded systems are also discussed. Both simulation and hardware examples are presented. The hardware experiment is performed in a hydraulic system with low damping composed of a solenoid and a regulator valve…
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Pressure Tracking Control of Electro-Mechanical Brake Booster System

Jilin University-Weihong Yang, Jian Wu, Rui He, Bing Zhu, Jian Zhao, Zhicheng Chen
  • Technical Paper
  • 2020-01-0211
To be published on 2020-04-14 by SAE International in United States
The Electro-Mechanical Brake Booster (EMBB) is a kind of novel brake-by-wire system, which integrates active braking, regenerative braking and other functions. It usually compose of servo motor, transmission mechanism, and hydraulic system. The EMBB system can greatly meet the development needs of vehicle intelligentization and electrification. For safety reasons, we usually requires the EMBB system to respond fast and accurately to braking requests during active braking. In engineering, the PID algorithm is often adopted for the pressure control of this actuator mechanism. However, since the EMBB is coupled with the hydraulic system, it is normally regarded as a nonlinear controlled object and therefore a large number of PID parameter tuning is required. In this paper, A fuzzy adaptive PID pressure control algorithm based on P-V characteristic of hydraulic system is proposed for the control of the self-designed EMBB to resisting its nonlinear characteristic. Firstly, the structure of the EMBB system used in the paper and its working principle are introduced. Secondly, a two-layer closed-loop control structure to control the EMBB is designed. The upper layer…
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Pre-validation method of steering system by using hybrid simulation

Hyundai Motor Company-Hong Suk Chang
  • Technical Paper
  • 2020-01-0645
To be published on 2020-04-14 by SAE International in United States
In this study, the preliminary validation method of the steering system is constructed and the objective is to satisfy the target performance while minimizing the problems after the detailed design considering it in the conceptual design stage. The first consideration about steering system is how to extract the reliable steering effort for parking. The tire model commonly used in MBD has limited ability to represent deformations under heavy loads. Therefore, it is necessary to study adequate tire model to simulate the behavior due to the large deformation and friction between the ground and the tire. The two approaches related with F tire model and mathematical model are used. The second is how to extract the each link’s load in the conceptual design stage. Until now, each link’s load is derived by the actual vehicle test, and a durability analysis was performed using the pre-settled RIG test conditions. Therefore, in this study, we established the process of deriving the RIG test conditions by integrating the hydraulic system and the dynamic system without actual vehicle test. The…
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Improve Transient Response correlation of SUV using MSC.ADAMS & MSC.EASY5 functional mockup interface for Hydraulic Power steering system.

Mahindra Research Valley-Baskar Anthonysamy, Visweswara Lenka, Balaramakrishna N, Abhijit Londhe
  • Technical Paper
  • 2020-01-0651
To be published on 2020-04-14 by SAE International in United States
This paper presents a comprehensive model of a hydraulic power steering system for predicting the transient responses under various steering inputs. The hydraulic system model, which integrates together all fluid line elements and hydraulic components, is formulated using the MSC Easy5 software. A Full Vehicle Model is developed in ADAMS/Car. Functional Mock up Interface (FMI), a tool independent standard is used for co-simulation of ADAMS and Easy5 Dynamic models. This paper describes a Co-simulation methodology developed using FMI interface for Full Vehicle Simulations using Hydraulic Power steering. A Virtual simulation scheme is developed to obtain the system transient responses and the results are compared with those measured from the tests. In general, the simulation results agree with those obtained from the tests under the same steering inputs and operating conditions. The presented model can predict the dynamic steering characteristics of the Full vehicle transient simulations with a good accuracy, which could otherwise only be done through testing on prototypes. These models can be used for tuning of performance and design of new power steering system.
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Study of skid steering method for distributed-drive articulated heavy vehicle based on the co-simulation model

Tsinghua University-Tao Xu, Xuewu Ji, Cong Fei, Yanhua Shen
University of Science and Technology Beijing-Yahui Liu
  • Technical Paper
  • 2020-01-0761
To be published on 2020-04-14 by SAE International in United States
Distributed-driver articulated steering vehicles (DASVs), the particular engineering equipment, have good maneuverability and tractability in poor road and narrow space conditions. They are always used in the mining, construction, forest, and agricultural industry. Its structure comprise front and rear frame connected by an articulation joint and two hydraulic struts. In the steering process, these two struts are driven by pump of hydraulic system, and the vehicle will turn following the control of steering wheel with the coupling effects of articulation joint and struts. But due to the high load of the DASVs, the influence of pressure of outlet chamber, and the compressible of the oil, it is easy to cause the high pressure level, the low energy efficiency, and poor stability in hydraulic steering process. This is not conducive to improving the security, economy, and stability of DASVs. Therefore, in order to solve these problems, this paper will make the DASVs as the objective vehicle, and take full advantage of its independent driving method to study the novel skid steering mode. Combining with the discussions…
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Research on Compensation Redundancy Control for Basic Force Boosting Failure of Electro-Booster Brake System

Jilin University-Jian Zhao, Zhicheng Chen, Bing Zhu, Jian Wu
  • Technical Paper
  • 2020-01-0216
To be published on 2020-04-14 by SAE International in United States
As a new brake-by-wire solution, the electro-booster (Ebooster) brake system can work with the electronic stability control (ESC) system equipped in the real vehicle to realize various excellent functions such as basic force boosting, active braking and energy recovery, which is promoting the development of smart vehicles. Among them, the basic force boosting is the function of Ebooster's servo force to assist the driver's brake pedal force establishing high-intensity braking pressure. After the basic force boosting failure of the Ebooster, it was not possible to provide sufficient brake pressure for the driver's normal braking, and eventually led to traffic accidents. In this paper, an compensation redundancy control strategy based on ESC is proposed for the boosting failure of the self-designed Ebooster. Firstly, introduced the working principle of Ebooster and ESC, and a suitable pressure-building circuit was selected for the dual brake actuator system; Secondly, after the basic force boosting failure of Ebooster, the rule-based strategy of braking awareness recognition was designed. Thirdly, a layered closed-loop pressure compensation control strategy is designed based on the compression…
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Q&A

SAE Truck & Off-Highway Engineering: February 2020

  • Magazine Article
  • 20TOFHP02_14
Published 2020-02-01 by SAE International in United States

Off-highway industrial machines require multi-function implement operation with dynamic duty cycles. In many cases, machine implements demand short bursts of full engine power and brake dynamic loads requiring 50% or more of energy consumed. Many next-generation machines reduce energy loss and improve productivity by incorporating hybrid-electric approaches with energy storage. An efficient implement solution enabling the hybrid-electric approach is essential to achieve maximum improvement potential.

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Lift Capacity Calculation Method Knuckle-Boom Log Loaders and Certain Forestry Equipment

MTC4, Forestry and Logging Equipment
  • Ground Vehicle Standard
  • J2417_202001
  • Current
Published 2020-01-10 by SAE International in United States
This SAE Standard provides a uniform method to calculate the lift capacity of knuckle-boom log loaders and certain forestry equipment. It establishes definitions and specifies machine conditions for calculations. This document applies to knuckle-boom log loaders as defined in ISO 6814 and ISO 17591 and certain forestry equipment defined in ISO 6814 that have a rotating upper-structure such as feller bunchers, forwarders, harvesters, and behind the cab or rear-mounted knuckle-boom log loaders not having their own power supply. It does not apply to harvesters that are incapable of lifting a tree or log completely off the ground. This document applies to those machines that are crawler, rubber-tired, and pedestal or stationary mounted.
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Coupling Assembly, Hydraulic Self Sealing, Quick Disconnect

G-3, Aerospace Couplings, Fittings, Hose, Tubing Assemblies
  • Aerospace Standard
  • AS1709B
  • Current
Published 2020-01-06 by SAE International in United States
This specification covers the requirements for aircraft, hydraulic, self-sealing, quick disconnect couplings, for use in Type II hydraulic systems (-65 to +275 °F temperature range) as defined by AS5440.
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Seamless, 304/304L Stainless Steel Tubing

Metallic Tubing Committee
  • Ground Vehicle Standard
  • J3129_201910
  • Current
Published 2019-10-14 by SAE International in United States
This SAE Standard covers seamless stainless steel pressure tubing intended for use as hydraulic lines and in other applications requiring corrosion resistance.
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