Automobile instrument clock precision measuring method and automobile instrument clock precision measuring device

Abstract

The invention discloses an automobile instrument clock precision measuring method and an automobile instrument clock precision measuring device. The device comprises a GPS module, a network module, and a measuring host. The GPS module and the network module communicate with the measuring host. The measuring host reads and writes the RTC (Real Time Clock) of an automobile instrument. The clock precision measuring method comprises the following steps: the GPS module acquires a GPS signal, and acquires UTC (Coordinated Universal Time) from the time frame information of the GPS signal; the network module acquires an NTP (Network Time Protocol) data message from a time server, and acquires NTP from the NTP data message; and the measuring host judges whether UTC or NTP is effective, takes effective UTC or NTP as a clock reference source, compares the clock reference source with RTC, and obtains and records a difference value. The time on a GPS satellite time and network time server is taken as a reference clock source. The error is calculated automatically through built-in software of the instrument. The accuracy of RTC precision measurement in the front period of instrument development is improved. Moreover, the device can be integrated with other automatic test equipment to realize uninterrupted record of data and improve test efficiency and precision.

Description

technical field [0001] The invention relates to the field of vehicle research and development, in particular to a method and device for measuring the precision of an automobile instrument clock. Background technique [0002] The built-in RTC (Real Time Clock, real-time clock) of the car instrument provides users with time and calendar display functions. In practical applications, affected by the ambient temperature and the precision of the crystal oscillator, there is a certain timing error in the RTC. In order to improve the timing accuracy, it is necessary to measure the timing error of the instrument in the early stage of design, and take measures to correct it. [0003] The traditional timing error measurement method is to let the meter run for a long time in a certain environment, referring to the standard clock source - such as computer time, stopwatch time, voice time reporting station, etc. Manually record the time of the measured instrument and the standard clock ...

AI Technical Summary

Problems solved by technology

[0004] 1. There are manual reading errors in manual records;

[0005] 2. Due to the need to record data regularly, the efficiency is low;

[0006] 3. The automation level of manual operation is low, which is not conducive to integration with existing measurement systems and error analysis

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