Using ultrasonic time difference method to test automobile fuel consumption, the test accuracy mainly depends on the testing system timing accuracy and ultrasonic flow sensor output signal-to-noise ratio. At present, the timing accuracy of the single-chip can reach the level of picosecond, and the noise mixed in the output signal of the ultrasonic converter is the main factor affecting the accuracy of fuel consumption testing. When the receiving signal contains noise, it will cause the signal amplitude to fluctuate, making the measurement time error. The analysis of same-frequency noise, circuit noise and colored noise is carried out, and the feasible measures to eliminate noise are put forward to provide reference for accurate calculation of sound and development of high-precision automobile fuel consumption test instruments.
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.
Sensor technology and computer control technology are applied to automobile fuel consumption testing in the automobile industry developed countries, the function and precision of the test are developing and perfecting continually. In our country, automobile fuel consumption test mainly applies ordinary consumption test devices, that test item are single-chip, which is applied for testing the flow of time. The display of method mainly based on the pointer instrument and partially on circuit control, so the maintenance and reliability of the test does not excellent. We do research and develop the intelligent one which is called quick testing instrument for automobile fuel consumption, which applies sensor technology, computer control technology and advanced instrument technology, that can be applied for the testing for automobile fuel consumption and data show. It can improve the measurement precision of automobile fuel consumption and degree of automation, with the down cost as high cost-effective consequences. The test instrument can be used for testing instantaneous fuel consumption, average fuel consumption and accumulative total consumption of gasoline engine and diesel engine.
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