High-frequency vehicle speed collection system and collection method

Abstract

The invention provides a high-frequency vehicle speed collection system and a collection method. The system comprises a vehicle speed sensor, a pulse counter, a collection interval timer, a pulse statistical time timer, a first controller and a second controller, wherein the pulse counter and the collection interval timer are different in fixed time; when the fixed time of the collection interval timer is up, the first controller reads the count value of the pulse counter and stores the count value in a way of First In First Out; when the fixed time of the pulse statistical time timer is up, the second controller reads 2*m values beginning from a stack head, and calculates m speed values by putting two data at the interval of m into one group. According to the high-frequency vehicle speed collection system and the collection method, as collection intervals are independent from pulse statistical time, the vehicle speed error can be effectively decreased; multiple vehicle speed values are calculated at one time, so that the system burden can be effectively reduced, and the requirements on the performance of a processor can be lowered.

Description

technical field [0001] The invention relates to the technical field of data processing, in particular to a high-frequency vehicle speed acquisition system and acquisition method in a vehicle-mounted terminal. Background technique [0002] As the government and the public have higher and higher requirements for the safe operation and daily supervision of vehicles, various driving recorders and vehicle satellite positioning terminal products have appeared on the market to monitor the driving process of vehicles. Vehicle speed is one of the most important parameters monitored by all such products. With the promulgation of relevant government product standards, the speed collection interval is required to be no more than 0.2s. [0003] Usually the vehicle speed information is obtained through the vehicle speed sensor. The vehicle speed sensor outputs pulse signals as the wheels rotate. The current vehicle speed can be calculated by counting the number of pulses of the vehicle...

AI Technical Summary

Problems solved by technology

[0004] The above method has two disadvantages: first, when the collection interval is very small, the number of pulses per unit time (that is, the collection interval) will be small, and the error of the vehicle speed calculated by this will be large; Hours, the system needs to switch frequently to calculate the vehicle speed. Under the same requirements, a processor with a higher main frequency is required, which increases the hardware cost.

Images