Vehicle speed detection method
A vehicle speed detection and vehicle speed technology, which is applied in the detection field, can solve the problems of inaccurate vehicle speed detection, increased troubles, etc., and achieves the effect of shortening the development cycle and reducing the technical disclosure work.
Inactive Publication Date: 2014-03-26
TAIZHOU SHUANGYU ELECTRONICS
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This method has two limitations in the design of the instrument software: it is required to accurately know the three data values of D, m, and n. Any inaccurate parameter will lead to inaccurate vehicle speed detection. When any parameter is unknown, the design cannot be completed; When the vehicle model changes, when any of these three parameters change, the instrument software must be modified accordingly, that is, the instrument model must be changed accordingly, so that it corresponds to the whole vehicle one by one. The troubles brought about by various business links are endless
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[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0018] A kind of vehicle speed detection method of the present invention, comprises the steps:
[0019] (1). Set the whole car on the speed test bench for testing, so that the car can run at a constant speed at a predetermined speed v;
[0020] (2). According to the known v and P, calculate the constant k=v / P;
[0021] (3). The system in the car instrument records and calculates the constant k and saves it in the memory;
[0022] (4). When the constant k is known...
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The invention discloses a vehicle speed detection method. A whole vehicle runs at a preset speed v, so that vehicle speed detection can be executed on a vehicle speed test bed on a whole vehicle detection line; at the moment, the signal frequency detected by a meter is P, and the formula that k=v / P can be obtained after calculation; the value k is stored into a meter system and serves as a constant k during normal working of the meter; when the meter works normally, the vehicle speed v is equal to kP. According to the technical scheme, the vehicle speed detection method has the beneficial effects of convenience and feasibility; a meter software designer does not need to pay attention to the mechanical structure and relevant parameters of the whole vehicle, so that the technical clarification work of a supplier and a customer in a product development process is reduced, the development period is shortened, and the vehicle speed detection method is suitable for all vehicle types of which the appearances and the sizes of the meters are the same.
Description
technical field [0001] The invention relates to a detection method, in particular to a vehicle speed detection method. Background technique [0002] Electronic instruments determine the vehicle speed by detecting the frequency of the vehicle speed sensor signal, such as 1Hz corresponds to 1km / h, and 60Hz corresponds to 60km / h. The frequency of the vehicle speed signal is generally determined by three parameters: tire diameter D (or circumference), which can convert the linear velocity of the tire, namely the vehicle speed v (unit km / h), into angular velocity ω1 (unit rPm), the formula is as follows: ω1=v / 60πD, the tire diameter of different models is different; the transmission ratio n, the reduction ratio n between the output shaft of the gearbox and the tire, this parameter can convert the angular velocity ω1 of the tire into the angular velocity ω2 of the output shaft of the gearbox, the formula is as follows : ω2=nω1, the transmission ratio of different models is differ...
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IPC IPC(8): G01P3/54
Inventor 阮献忠戈梅华吴玉成
Owner TAIZHOU SHUANGYU ELECTRONICS