Temperature Field in Electric Control Unit of Diesel Engine and its Optimization Design

2011 ◽  
Vol 340 ◽  
pp. 76-80
Author(s):  
Zhen Jie Liu ◽  
Yu Long Lei ◽  
Yong Jun Li
Keyword(s):  
Thermal Analysis ◽  
Temperature Field ◽  
High Temperature ◽  
Diesel Engine ◽  
Structural Optimization ◽  
Optimization Design ◽  
High Reliability ◽  
Control Unit ◽  
Operating Conditions ◽  
Electric Control

In order to satisfy the requirements of the high reliability of electric control unit (ECU) of the Diesel Engine, the thermal analysis of ECU was performed by using the software FLOTHERM based on the finite volume method. The temperature field of ECU was obtained under different operating conditions. The structural optimization of ECU was completed to solve the problem of local high temperature. As a result, the operational temperature of ECU is reduced under the allowable limit, and its reliability is improved. The physical experiment shows that the thermal analysis and structural optimization are valid. The local high temperature could be reduced effectively and the operational reliability is improved.

Reliability Evaluation of Cu-Al WB in High Temperature and High Current Applications

2021 ◽  
Author(s):  
Pradeep Lall ◽  
Sungmo Jung
Keyword(s):  
High Temperature ◽  
High Reliability ◽  
Copper Wire ◽  
Planck Equation ◽  
Operating Conditions ◽  
Polarization Curves ◽  
Automotive Electronics ◽  
Wire Bonds ◽  
Chlorine Ions ◽  
Copper Aluminum

Abstract High reliability harsh environment applications necessitate a better understanding of the acceleration factors under operating stresses. Automotive electronics has transitioned to the use of copper wire for first level interconnects. A number of copper wire formulations have emerged including palladium coated copper and gold-flash palladium coated copper. The corrosion reliability of copper wire bonds in high temperature conditions is not yet fully understood. The EMC used to encapsulate chips and interconnects can vary widely in formulation, including pH, porosity, diffusion rate, composition of contaminants and contaminant concentration. To realistically represent the expected wirebond reliability, there is need for a predictive model that can account for environmental conditions, operating conditions, and exposure to EMCs. In this paper, different EMCs were studied in a high-temperature-current environment with temperature range of 60°C–100°C under current of 0.2A–1A. The diffusion kinetics based on the Nernst-Planck Equation for migration of the chlorine ions has been coupled with the Butler-Volmer equation for corrosion kinetics to create a Multiphysics model. Polarization curves have been measured for copper, aluminum and intermetallics under a number of pH values, and chlorine-ion concentrations. Tafel parameters have been extracted through measurements of the polarization curves.

Experimental analysis of the influence of coolant and oil temperature on combustion and emissions in an automotive diesel engine

2018 ◽  
Vol 20 (2) ◽  
pp. 247-260 ◽  
Author(s):  
Xavier Tauzia ◽  
Alain Maiboom ◽  
Hassan Karaky ◽  
Pascal Chesse
Keyword(s):  
Particulate Matter ◽  
Diesel Engine ◽  
Control Unit ◽  
Operating Conditions ◽  
Volumetric Efficiency ◽  
Coolant Temperature ◽  
Lower Efficiency ◽  
Combustion Heat ◽  
Hydrocarbon Emission ◽  
Energy Share

Since many trips are of short duration and include a cold start, automotive engines run quite often without having reached their nominal temperature. This is known to have some major drawbacks, such as increased fuel consumption and higher emissions due to lower efficiency of after-treatment devices, but detailed description of these various effects is seldom presented in the literature. In this article, experiments were conducted on an automotive diesel engine by varying independently the coolant and oil temperatures between 30 °C and 90 °C. Three different operating conditions (low, mid and full load) were studied. The experimental set-up is briefly described as well as the uncertainty of the associated measurements and the development of analytic tools. Then, the evolution of volumetric efficiency, energy share, combustion heat release and exhaust emissions (NOx, particulate matter, CO, unburned hydrocarbons) are described in detail and analysed. Several strategies were considered, including some corrections used in the standard engine control unit to compensate for the low coolant temperature. Some effects of the coolant and oil temperature reduction were clear: increase in friction losses, volumetric efficiency and ignition delay and decrease in NOx emissions. On the contrary, the evolution of brake thermal efficiency, particulate matter, CO and unburned hydrocarbon emission depended on the operating point.

Strength Analysis and Structural Optimization of Multi-Piece Wheels for Heavy Vehicles

2020 ◽  
Author(s):  
Jintao Luo ◽  
Xiandong Liu ◽  
Yue Zhang ◽  
Yingchun Shan
Keyword(s):  
Structural Optimization ◽  
Optimization Design ◽  
Lightweight Design ◽  
Operating Conditions ◽  
Strength Analysis ◽  
Fast Method ◽  
Radial Load ◽  
Heavy Vehicles ◽  
Material Efficiency ◽  
Bending Load

Abstract Due to the capacity for high payloads and harsh operating conditions, and the simple demounting tire operation, multipiece wheels are widely used on heavy vehicles and construction machinery. There is potential for weight reduction of one certain multi-piece wheel (type 8.5-20) for heavy vehicles based on its greatly low failure rate from the customer usage data. In order to improve material efficiency, the strength analysis and structural optimization of the multi-piece wheel was systematically studied in this paper. The characteristics of the wheel under the bending load and radial load were simulated by using finite element method (FEM). According to the obtained stress distribution, the rim base was optimized on the basis of its performance under the radial load. SolidWorks, Abaqus and Excel were integrated on the optimization design platform Isight to automate the optimum workflow based on the approximation loop strategy. This strategy packed in Exploration component of Isight is an iterative algorithm which creates an approximation and executes an optimization plan multiple times, updating the approximation automatically between each cycle if deemed necessary. Eventually, the optimal results showed that a good lightweight design effect was acquired, and the weight of the rim base was reduced by 6.5% under requirements of strength and rigidity. The research provides a fast method for the optimal design of wheels because of less calculation of simulation model and fast convergence with above strategy.

Study on lightweight structural optimization design system for gantry machine tool

2019 ◽  
Vol 27 (2) ◽  
pp. 170-185
Author(s):  
Shihao Liu ◽  
Yanbin Du ◽  
Mao Lin
Keyword(s):  
Structural Optimization ◽  
Machine Tool ◽  
Optimization Design ◽  
Structural Parameters ◽  
Lightweight Design ◽  
Operating Conditions ◽  
Experimental Comparison ◽  
Design System ◽  
Manufacturing Cost ◽  
Gantry Machine Tool

In order to improve the efficiency and effectiveness of the lightweight design of the gantry machine tool, a lightweight structural optimization design system for the gantry machine tool was constructed. Serialized gantry machine tools were parametrically modeled, and a load model with multiple operating conditions was established. A twice optimization design method integrating zero-order optimization, parameter rounding, and structural re-optimization was proposed. Using the proposed method, a lightweight structural optimization design system for gantry machine tool with parametric design, lightweight design, and other functions was developed. The developed gantry machine tool lightweight structural optimization design system was applied to complete the lightweight structural optimization design of gantry frame of a certain gantry machine tool, so the structural parameters of the gantry frame were optimized. Although the maximum stress and the maximum deformation of the gantry frame increases within the allowable range, the experimental comparison before and after the optimization shows that the mass of the whole gantry frame is reduced by 9.24%, which is beneficial to save the manufacturing cost. The research results show that the constructed lightweight structural optimization design system of the gantry machine tool has high engineering practicality.

scholarly journals Calculation of Intake Oxygen Concentration through Intake CO2 Measurement and Evaluation of Its Effect on Nitrogen Oxide Prediction Accuracy in a Heavy-Duty Diesel Engine

Energies ◽  
2022 ◽  
Vol 15 (1) ◽  
pp. 342
Author(s):  
Roberto Finesso ◽  
Omar Marello
Keyword(s):  
Diesel Engine ◽  
Oxygen Concentration ◽  
Control Unit ◽  
Absolute Error ◽  
Operating Conditions ◽  
Intake Manifold ◽  
Heavy Duty ◽  
Input Quantity ◽  
Heavy Duty Diesel Engine ◽  
Heavy Duty Diesel

A new procedure, based on measurement of intake CO2 concentration and ambient humidity was developed and assessed in this study for different diesel engines in order to evaluate the oxygen concentration in the intake manifold. Steady-state and transient datasets were used for this purpose. The method is very fast to implement since it does not require any tuning procedure and it involves just one engine-related input quantity. Moreover, its accuracy is very high since it was found that the absolute error between the measured and predicted intake O2 levels is in the ±0.15% range. The method was applied to verify the performance of a previously developed NOx model under transient operating conditions. This model had previously been adopted by the authors during the IMPERIUM H2020 EU project to set up a model-based controller for a heavy-duty diesel engine. The performance of the NOx model was evaluated considering two cases in which the intake O2 concentration is either derived from engine-control unit sub-models or from the newly developed method. It was found that a significant improvement in NOx model accuracy is obtained in the latter case, and this allowed the previously developed NOx model to be further validated under transient operating conditions.

Simulation of the Screw Thread Connection Temperature Field Based on ANSYS

2013 ◽  
Vol 440 ◽  
pp. 204-209
Author(s):  
Fu Sun ◽  
Xiao Lei Wu ◽  
Shi Feng Yao ◽  
Guang Ye Liang
Keyword(s):  
Thermal Analysis ◽  
Temperature Field ◽  
High Temperature ◽  
Screw Thread ◽  
Significant Safety ◽  
Thread Connection ◽  
Safety Issues ◽  
Thread Surface ◽  
Complex Process ◽  
The Relationship

Friction of screw thread connection will cause temperature rise while projectile unloading, Too high temperature which would cause the combustion will result in significant safety issues, so the temperature field of screw thread connection must be analyzed when the projectile unloading. But friction is a complex process, how to simulate the temperature change accurately is the key link of the whole analysis. In this paper, friction of the screw thread surface in the process of unloading is simulated based on thermal analysis function of ANSYS. According to temperature distribution of the screw thread surface, the highest temperature and position of the highest temperature point is determined. The relationship between temperature and different speed is analyzed, which can provide a theory basis for safely unloading.

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