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Study for The Method of Automobile Oil Consumption Measuring Based on Ultrasonic Wave
Abstract
In response to the problems of automobile oil consumption direct test and indirect test, Ultrasonic technology and microcontroller control technology can be used to research automobile oil consumption testing technique. Deciding on the method of automobile oil consumption testing is based on the fluid testing principle of ultranonic wave technology and build a mathematical model of automobile oil consumption tesing, According to the functional requirements of oil consumption, design the automobile oil consumption system hardware, control circuit and control automation programming to achieve the oil consumption inteligence non-disintegrated measuring. By means of tests and data processing analaysis and modifying the theoretical model, the theory used by the system is feasible and oil consumption measuring system with low power consumption and high accuracy.
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Ultrasonic transmitting, receiving and amplifying circuits are designed. The received signals are sampled with the high speed ADC (analog-to-digital converter), and dealt with the DSP (digital signal processing). A forward-backward IIR (infinitive impulse response) filter with no delay is designed to filter the sampled data, and series A and B are achieved by narrow and wide band filtering, respectively. In series A, the start point of the cycle first exceeding the threshold is calculated accurately by interpolation, and the start cycle is detected by fitting cycles in series A and its inversion A′ to cycles in B with variance analysis. Therefore, the start point of the start cycle is calculated precisely. By deriving the relationships between the travel time in the opposite directions of three axes and the airflow velocities, the wind velocity and direction are calculated. Experiments show that the reliability and the precision are improved, and the circuits are simplified.
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