CAE platform for automotive electronics design
The development and design of contemporary automotive electronics products has benefited extensively from computer-aided engineering software (CAE) in accelerating the development process, reducing development costs, and improving product quality. This paper takes an oil and gas control and ignition system of an engine as an example to illustrate the application of Ansoft's EM tools in automotive electronics and control system design, and provides a new choice for Chinese automotive electronics design engineers. This article refers to the address: http:// The increasing number of electronic components in automobiles is due to the increasing demand and expectations of automotive products. For example, higher requirements for automotive safety systems have resulted in anti-lock brakes (ABS), track control systems, anti-skid, anti-roll and side airbag protection. The requirements for higher fuel efficiency have led to the introduction of Direct Injection, Displacement On Demand, Electronic Valving and Hybrid Vehicle. These ever-increasing electronic systems make automotive systems more complex and make the development and design of these systems more challenging. For increasingly complex automotive parts and electronic systems, traditional control methods have become inadequate. For example, conventional engine ignition timing control is based on a table lookup method. This method has many limitations for modern engines. One is that the table method cannot take into account the dynamic characteristics of the engine; the other is that the modern engine needs to be controlled from the previous hundreds to the current tens of thousands, so that The method of table lookup is difficult to implement and it is no longer possible to improve the performance of the generator. Along with this, a modern control that replaces this method is the control method of the basic model. The implementation of this method does not change with the complexity of the engine, but requires a more accurate dynamic model of the engine. The development methods and processes of automotive electronic devices and systems must also speed up, reduce costs, and increase quality to meet the management objectives of the manufacturers. The traditional hardware development, testing, re-development, and re-testing repeat modes are time-consuming, labor-intensive, and cost-effective. It will increase accordingly. In this context, more and more automotive electronics manufacturers use computer-aided engineering software to accelerate the development process, reduce R&D costs, and improve product quality. The specific method is: the manufacturer completes the product design and analysis work as much as possible (up to 80% to 90% of the workload) on the virtual platform of the computer, but only the final step is to carry out the actual hardware implementation. Figure 1: Example of an oil and gas control system design for an engine. Design example of brushless motor instead of brush motor oil pump We use the engine's oil and gas control system as an example to illustrate the design process. As shown in Figure 1. First, a manufacturer decided to replace the traditional brush motor oil pump with a brushless motor. It starts with the RMxprt software, which has 13 motor and generator modes including brushless motors. The user only needs to input the design parameters related to the motor, such as input voltage, power, number of poles, permanent magnet type, etc. RMxprt can automatically design a basic brushless motor and calculate the motor in different operating states (such as empty Performance parameters such as load, full load), such as torque, speed and efficiency. If the user wants to further analyze and optimize the basic motor designed above, he can use the full-featured FEA software. Maxwell is a universal FEA software for electromagnetic analysis. It can be designed for any two- or three-dimensional entity, where each object can have different non-linear electromagnetic properties for static or dynamic performance analysis related to electromagnetic fields. For example, the user can analyze the distribution of the magnetic field strength within a motor to determine the gap of the stator slot, or adjust the air gap to determine the magnitude of the torque. At the same time, a very important function of Maxwell is dynamic loss calculation, including core loss caused by eddy current and hysteresis. Due to the versatility of Maxwell software, it can be used for any system analysis and design including electromagnetic principles other than motors, such as variable reluctance speed sensors, Solenoids, reactors and transformers. After the motor design is completed, its accurate simulation model can be directly applied to the line simulation system software Simplorer. This process of directly generating a line model from an FEA model eliminates many of the cumbersome processes of modeling physical systems. Simplorer is a circuit-centric simulation system software with multiple physical domains including mechanical, hydraulic, and thermal energy. Unlike many other line emulation software, the components used in the Simplorer circuit are models based on physical principles rather than behavioral models. Thus, when the entire system model is built, its behavior is determined by the physical characteristics of each component. In the line simulation, the design and analysis of the motor drive control circuit is first completed, which includes the speed control of the motor using solid-state switching elements and PWM control methods. System design examples outside the circuit In addition, Simplorer can also be used for system design outside of the circuit. In the oil circuit control diagram below (Fig. 2), the oil pump is driven by the motor designed above. The fuel passes through the oil pump filter and the oil pressure control valve enters the electronic control nozzle. The switch and time of the electric nozzle are controlled by the solenoid valve. The electromagnetic coil used in the valve is also precisely designed by the FEA. The upper end of the electromagnetic coil is connected to the electronic control part, and the lower end is connected to the sliding body and the ejector pin of the EFI. In this way, the system model of the control of the entire oil passage is completed, and the dynamic characteristics of the pressure and flow of the oil passage can be analyzed and debugged by simulation. Figure 2: Schematic diagram of oil circuit control. Similar to this is the gas control system, in which all component models come from the automotive and hydraulic system model libraries that come with the Simplorer software, which contain many of the basic components used in automobiles, such as wires, fuses, igniters. , engine and gearbox, etc. In this way, automotive electronics design engineers can quickly build a system model of the design. After the oil circuit and pneumatic control are completed, the ignition system can be designed. In the ignition system, the design of the ignition coil directly inserted into the igniter is also designed to optimize the electromagnetic characteristics by the FEA method. Electronically controlled conversion of electrical energy to the high voltage arc required for the igniter, because the arc characteristics (voltage level, arc duration) have a great impact on the engine ignition process and operating performance, so a good performance with CAE design The ignition system makes a lot of sense. The voltage and current waveforms on the igniter simulated by the computer are in good agreement with the actual test results and the simulation results. Summary of this article Ansoft EM Tools is a mainstream CAE product in the automotive electronics industry including North America, Europe and Japan. Its products are used in the simulation, analysis, design and optimization of electromechanical systems. EM tools include: dedicated component design software RMxprt and Pexprt; finite element analysis software (FEA) for general electromagnetic systems; Maxwell; general multi-physics simulation software Simplorer. These products are organically combined to form a smooth and efficient design platform. The above example shows that with advanced design simulation software, complex processes such as engine oil and gas ignition systems can also perform accurate performance analysis before designing a physical object. Ansoft's EM tools are also widely used in other aspects of automotive design. In the following automotive electronic systems, EM tools are used to design and analyze sensors, drives, communication and control systems, including: Power system: including oil and gas control, ignition system, electric water pump, electric compressor and electronically controlled valve system. Transmission system: including electronically controlled hydraulic system and comfortable speed change. Chassis and suspension system: Includes semi-active and fully active suspension systems. Track control system: including ABS, electric power steering system (EPS), tire pressure management system (TPM). Body electronics: including dashboard systems, harness design, lighting and communications. Safety protection system: including side airbag sensing and detonation system and anti-rolling system. Comfortable and convenient setting: including small motors for car seats, doors, wipers, air conditioners, etc.
The Work Light is Ideal for mechanic's, DIY, boating, camping, night fishing ,Camping, Hiking, Workshop, Roadside safety, Auto repair, Emergency kits, Survival device, Home security etc.
Work Light Work Lights,Extendable Work Light,Rotating Work Light,Switch Light Ningbo Henglang Import & Export Co.,Ltd , https://www.odistarflashlight.com
Both Work Light's Base and Body have strong magnet to magnetize on metal surfaces for more convenience; Use Hook to hang on any place to provide brightness.
The Opereating Time of work light up to 6 Hours As Per One Fully Charged, It can Also be Used as a Backup Battery to Charge Your Phone or Other Digital Device.