Automatic automobile clock correction system and correction method thereof

Abstract

The invention aims to provide an automatic automobile clock correction system capable of automatically correcting an automatic clock and a correction method thereof. The automatic automobile clock correction system comprises a clock processing unit and a clock display unit, wherein the clock processing unit comprises a clock signal generating circuit and a clock signal processing circuit; and the clock display unit receives and displays a clock signal transmitted from the clock processing unit; and the key point is that the clock processing unit is connected with a GPS receiving unit through a CAN bus. The correction method comprises the following steps: after the automobile is electrified, the clock processing unit receives a satellite clock synchronous signal by using the GPS receiving unit and corrects the local clock according to the synchronous signal; and after the correction is finished, the clock processing unit shields the satellite clock synchronous signal of the GPS receiving unit, times and generates the clock signal by using the clock signal generating circuit and the clock signal processing circuit arranged in the clock processing unit and transmits the clock signal to the clock display unit for displaying.

Description

technical field [0001] The invention relates to an automobile clock display, in particular to a system for accurately correcting an automobile clock. Background technique [0002] The accuracy of the time not only affects the data collection of each unit of the car, but also plays a very important role in the driver's handling of daily work and testing. At present, automobiles generally use a combination instrument to display time, and its accuracy mainly depends on the frequency of the crystal oscillator and software compensation: there will be slight differences in the frequency of different crystal oscillators, and this difference is compensated by software, but this software compensation is only in a specific Calibration is carried out at temperature (usually room temperature), and the condition of the whole vehicle is very harsh, not only there is a wide range of temperature differences (the frequency of the crystal oscillator will vary at different temperatures), but a...

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Problems solved by technology

At present, automobiles generally use a combination instrument to display time, and its accuracy mainly depends on the frequency of the crystal oscillator and software compensation: there will be slight differences in the frequency of different crystal oscillators, and this difference is compensated by software, but this software compensation is only in a specific Calibration is carried out at temperature (usually room temperature), and th

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