The Research On Exhaust Analyzer Based On Embedded Technology

As strict exhaust law is enforcing and quantity demand for exhaust analyzer expanding, the requirements for exhaust analyzer's high whole practicability have enhanced. This thesis introduces the portable exhaust analyzer's improvement research works which mainly include four parts, the non-segmented multi-pointed single-ranged calibration/measurement algorithm analysis and design, the hardware design, the replanting of the C/OS- kernel and the analyzer's software building block design.A calibration/measurement method, whose features are non-segmented single-ranged and multi-pointed, is presented. Through using least square tolerance polynomial to fit the sensor's output nonlinear characteristic, the measurement precision is qualified and tested right by experiment. A software general design method, which derived from the OOD (object oriented design) method to efficiently guide embedded system's block design, is summed up. This method aims to work out independent block modules from tasks, focus on the software's cohesion and stratified structure and valuable for small scale embedded software development.The hardware circuit is redesigned to fit MCU (main control unit) control and the system's hardware resources are carefully planed. As to Software works, the uC/OS-II kernel is replanted and rescaled under the IAR IDE environment. The kernel, which includes four parts, the task management, the memory management, the time management and the inter-task communication and synchronization, is the control core of the system's resources. By analyzing the functions and the interfaces of the system, seven tasks, which are the clock task, key task, system task, analog input output task, calibration/measurement task, communication task and LCD display task, are built up, and followed by the complement of system's building blocks' design.Generally, the thesis's discussion builds up a foundation for adapting old apparatus to satisfy new demands.