Measurement and control method for engine coolant temperature sensor, and measurement and control system thereof
An engine coolant and temperature sensor technology, which is applied in thermometer testing/calibration, thermometers, instruments, etc., can solve problems such as low efficiency, unintuitive and accurate testing and calibration, and poor control of testing and calibration, achieving high efficiency, Intuitive, HMI-friendly results for testing and calibration
Inactive Publication Date: 2014-07-23
HUBEI UNIV OF AUTOMOTIVE TECH
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Problems solved by technology
[0003] The present invention aims to solve the problems of the related testing and calibration of the existing engine coolant temperature sensor, which are not easy to control, the testing and calibration is not intuitive enough, accurate enough, and the efficiency is low. The measurement and control method and the measurement and control system of the engine coolant temperature sensor that can be conveniently applied in practice
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[0024] The engine coolant temperature sensor measurement and control method of the present invention comprises:
[0025] First of all, the median filter method is used to process the AD conversion value. Since the median filter involves the numerical sorting problem, in order to ensure sufficient sampling accuracy, the number of oversampling for a certain point must be relatively large, and the efficiency of the sorting algorithm must be considered The problem is that the Hill sorting method with high efficiency is selected for this purpose; the time complexity of the Hill sorting method is O(n), and the Hill sorting method requires that the number n to be sorted be an integer multiple of 4, so the number of sorting n= 128. In theory, compared with the bubbling method, the efficiency is increased by 46.1 times when n=128. Through the CCS online simulation debugging window and the breakpoint observation, the Hill sorting method takes about 0.5ms, while the bubbling method takes ...
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The invention relates to a measurement and control method for an engine coolant temperature sensor, and a measurement and control system thereof. The measurement and control method includes the following steps: firstly processing an over-sample AD conversion value through a median filtering method; performing two-step calibration on a temperature-voltage relation; under a condition of open-loop manual voltage regulation input condition, establishing a preliminary calibration relation between a measurement temperature T and a signal voltage value V; establishing a second calibration relation between a practical temperature T and a current signal voltage V in a closed-loop control system; and next, establishing a fitting relation between the practical temperature T and a current signal voltage V<D> of the temperature sensor. The measurement and control system includes a lower-computer unit, an upper-PC man-machine interface, an engine coolant temperature work condition simulating device, the engine coolant temperature sensor and an automobile water temperature meter. The measurement and control method is simple in operation and high in test and calibration efficiency and precision. The measurement and control system is simple in structure, convenient to operate and control, safe and stable to use, and visual, accurate and highly efficient in test and calibration.
Description
technical field [0001] The invention relates to the technical field of temperature sensors, in particular to a measurement and control method and a measurement and control system for an engine coolant temperature sensor. Background technique [0002] With the development of my country's automobile industry, automobile electronics technology has increasingly become one of the core technologies of the current automobile industry development. "Automotive Sensing Technology", as the core professional basic course of the automotive electronics major, has been facing the current situation of lack of experimental equipment in the practice teaching link in recent years. The current sensor test benches on the market cannot meet the practical teaching requirements of automotive sensing technology. The coolant temperature sensor is intuitively and accurately tested and calibrated. In the process of temperature sensor calibration, the DSP built-in ADC module has certain limitations in ...
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IPC IPC(8): G01K15/00G09B25/02
Inventor 程登良黄海波王卫华张凯蒋伟荣黄志文
Owner HUBEI UNIV OF AUTOMOTIVE TECH
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