Devise And Realization Of The Automobile Mixed Instrument

To ensure traffic safety, the driver through the visual and auditory access road and traffic conditions, such as vehicle information, but it also needs access to information relating to the car itself, to make possible the judge, the right to drive the motor vehicle. Car driver is the instrument through visual understanding of the state car one of the necessary components, so that the dashboard is the vehicle and driver information exchange window.With the electronic information technology in all aspects of the various sectors of the rapid development and extensive application in the field of automobile, automobile instrument digital, intelligent process is accelerating. On the dashboard in principle on the major technological innovations to the car instrument experienced four generations. The first generation of the dashboard is based on the work of the mechanical force and mechanical instruments, known as mechanical movement table; second-generation automotive instrument, the work is based on measuring principle, that is, through various types of sensors will be measured non-converted into electricity Telecom Measurement of them, known as electrical instrument; took third electronic circuit simulation; took the fourth all-digital stepper motor-vehicle instrument. After several decades of development, the structure has experienced moving coil movement (with a rotating coil indicators)and fixed-magnetic movement (indicators together with the magnets rotation) Instrumentation two basic stage. Although in the whole development process, the engineering staff at home and abroad has never ceased to improve it, such as on reducing the cost and improving production technology, mechanical parts and components were initially metal mainly to the development of plastic parts to mainly focus on enhancing the smooth precision instructions and guidelines, developed by dynamic magnetic, but the restrictions by working principle, linear, accuracy, repeatability, speed and other performance indicators response to a fundamental breakthrough. To solve the above problem, the need for a consistency, high universality, and high reliability and drive movement to replace the above-mentioned two traditional movement.With computer technology and micro-stepper motor technology and the continuing development of this technology for automotive instrument may be brought changes and opportunities. Is a micro-stepper motor to drive signal pulse as a special motor, it is a can basically satisfy the general movement all models, as long as the software of different models, the relevant parameters for the appropriate modifications, hardware , the main structure of the software does not need to make any changes, will be able to meet its requirements. Omit the analog circuits of electronic instrumentation for different car models needs to be redesigned circuit debugging again, then do the reliability of the complex process to maximize shorten product development time and costs. What is more important is to avoid a possible technical risk. Use it to drive the instrument guide, and the traditional fixed-and moving coil magnetic movement compared to the dashboard, it is small in size, light weight, precise instructions, high reliability, dividing evenly, fast response, wide adaptation , and anti-strong, production and testing process is simple, compatibility and high universality, consistency and good benefits, and are particularly suited to use SCM control. SCM and high integration, anti-interference capability, and a strong data processing capabilities and interface features, all of the features from the software implementation, application flexibility, the system's expansion, a typical configuration, standardized, easy form of scale applications. SCM to control the micro-stepper motor driven instrument instruction pointer to achieve full play to the function of SCM and stepper motor all the advantages that they constitute the perfect combination of the stepper motor-vehicle digital instrument not only retained the portfolio Pointer shows that the traditional model of the instrument, instructions, simple, intuitive, consistent with the traditional visual effects, more importantly, the accuracy is much higher than the direct current national standards, good repeatability and uniformity of the response speed, jitter-free, high reliability, product quality and reliability of the stability of the fundamental guarantee for a wide range of applications, it is ideal for modern car production. Therefore, the combination of stepper motor-vehicle dashboard instrumentation will be the inevitable trend of development.Stepper motor car Instrument there are three main parts: automotive sensors, embedded micro-computer (SCM) and the stepper motor. Sensor signal instrument is part of the acquisition, signal conversion feature hardware; embedded micro-computer (SCM) of the instrument is the signal acquisition and related process control, data processing, data retention, data exchange features such as the common hardware; Step Motor Show is the driving components.Based on this, the subject done a further feasibility study, discussed in detail by the sensor, AT89C52 SCM and a stepper motor, including speedometer, tachometer, fuel and oil pressure gauges table, automotive electronic portfolio Instrument design. The combination of automotive electronic instruments with high accuracy, linearity, and fast response, adaptability, and other benefits to make up for the traditional automobile instrument deficiencies.