Speed measuring device, method and vehicle speed measuring system
A speed measurement and airflow speed technology, applied in the field of vehicle speed measurement system and speed measurement device, can solve the problems of large speed error and high computational complexity, and achieve the effect of simple implementation and high measurement accuracy
Active Publication Date: 2019-11-08
BYD CO LTD
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[0003] The present disclosure provides a speed measurement device, method and vehicle speed measurement system, which are used to solve the problems of large speed error and high computational complexity existing in the prior art
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[0054] Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatuses and methods consistent with aspects of the present disclosure as recited in the appended claims.
[0055] The present disclosure provides a speed measurement device, which may include: a controller and a first electric bridge.
[0056] Wherein, the first electric bridge includes a thermosensitive element and a voltage dividing module, the thermosensitive element and the voltage dividing module are connected in series, and the two ends of the first electric bridge are respectively co...
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The present invention provides a speed measuring device, a speed measuring method and a vehicle speed measuring system. The device includes a controller and a first electric bridge; the first electricbridge includes a thermo-sensitive component and a voltage dividing module; the thermo-sensitive component and the voltage dividing module are connected in series with each other; two ends of the first electric bridge are respectively connected with the positive pole and negative pole of a power source; the first input end and second input end of the controller are respectively connected with twoends of the voltage dividing module, so that the controller can acquire the voltage of the voltage dividing module; when airflow flows through the thermo-sensitive component, the resistance value ofthe thermo-sensitive component changes with temperature, and the voltage of the voltage dividing module changes with the change of the resistance value of the thermo-sensitive component; and the controller is used for adjusting the temperature of the thermo-sensitive component when a preset compensation condition is satisfied, so as to make the resistance value of the thermo-sensitive component return to a target resistance value, acquiring the voltage variation quantity of the voltage dividing module in the adjustment process, and obtaining the speed of the airflow according to a mapping relation between the voltage variation quantity and airflow speed variation quantity. The device of the invention has the advantages of simplicity in realization and high measurement accuracy.
Description
technical field [0001] The present disclosure relates to the technical field of motion measurement, in particular to a speed measurement device, method and vehicle speed measurement system. Background technique [0002] At present, with the increasing number of automobiles, people pay more and more attention to the performance of automobiles, especially the speed characteristics of automobiles such as instantaneous speed and turning speed. Indirect calculation of the vehicle's travel speed. In the process of converting the wheel speed into the vehicle speed, due to the influence of the speed adjustment of the four wheels, such as in situations such as turning and braking, the slip ratio is too large, and the calculated vehicle speed will have a large difference from the actual speed. The deviation, and the modeling of the conversion process needs to measure a large amount of data and select key parameters, and the complexity is high. Contents of the invention [0003] Th...
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IPC IPC(8): G01P5/12
CPCG01P5/12
Inventor 陈乐吴春芬陈楷青石为利周静萍
Owner BYD CO LTD