Method for measuring phase difference in vehicle chassis dynamometer system
A chassis dynamometer and phase difference technology, applied in the field of vehicle measurement, can solve the problems of high processor requirements, large amount of calculation, long calculation time, etc., to save hardware costs, meet transient loading, and fast processing speed Effect
Inactive Publication Date: 2009-07-22
BYD CO LTD
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Another example is the traditional fast Fourier transform phase difference method, because of the large amount of calculation and the long operation time, the requirements for the processor are very high
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[0024] Application object of the present invention-a kind of embodiment of chassis dynamometer test system is for example figure 1 As shown, in the chassis dynamometer test system, a magnetoelectric phase difference torque sensor is used to find the torque. The characteristic of this type of torque sensor is that when the applied torque is zero, that is, when the power is not lost, the electromotive forces in the two coils have a constant initial phase difference, which is only opposite to the installation of the two gears on the shaft. The geometric position is related to the fixed position of the two magnetic cores, which is generally specified as 180°; when the torque of the rotating shaft is added to the rated value, the phase difference at this time is 90°. When the load output by the rotating shaft changes from no-load to light-load, heavy-load to full-load, the phase difference of the two output electromotive forces ranges in (90°, 270°), and the phase difference is pro...
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A method for measuring phase difference in a vehicle chassis dynamometer system: set the sampling rate and number of sampling points of the acquisition card to a sufficiently high level; divide a×1000 sample points collected each time into n groups, and use modules to The ak / n sample points of the group are processed to obtain 1 phase value; judge whether the phase value is between (0°, -270°), if so, add 360°; subtract the phase value of the two signals , get n phase differences of n groups of sample points; judge whether the above n phase differences are all greater than zero, otherwise add 360°; average the above n phase differences; in the chassis dynamometer test system used, When the load output by the rotating shaft changes from no-load to light-load, heavy-load to full-load, the range of the phase difference between the two output electromotive forces is (90°, 270°), and the phase difference is proportional to the torque value; it can be directly Calculate the phase difference, and can meet the real-time control requirements of the system.
Description
technical field [0001] The invention relates to vehicle measurement technology, in particular to a method for measuring phase difference in a vehicle chassis dynamometer system. Background technique [0002] In general, methods for measuring phase difference in vehicle chassis dynamometer systems can be roughly divided into two categories. [0003] One is the method of using some analog devices combined with digital programming. Digital phase detectors are typical of this type of analog-to-digital combination. The so-called digital phase detector refers to transforming two sinusoidal signals into square waves through a shaping circuit, and then passing through a phase measurement logic circuit (exclusive OR), and then filling high-speed pulses into the positive pulses of the output signal, and then filling in the positive pulse through the record. The phase difference is measured by the number of pulses. Since the single-chip microcomputer itself will generate high-speed ...
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IPC IPC(8): G01M17/007
Inventor 罗如忠龙光展李海娟
Owner BYD CO LTD