Method for monitoring motion status of vehicle and related chip, and system

A tire pressure monitoring chip, comprising:

• a pressure sensor, configured to detect and obtain pressure data of a tire on a wheel;
• an accelerometer, configured to output an acceleration value in a first axial direction and an acceleration value in a second axial direction with a movement of the vehicle;
• a radio frequency transmitter, configured to send the pressure data to a vehicle processor;
• a controller, coupled to the pressure sensor, the accelerometer and the radio frequency transmitter respectively and configured to perform:
• obtaining N acceleration values in a first axial direction collected from N times sampling within a preset time period through an accelerometer mounted on a wheel;
• and obtaining a maximum acceleration change value in the first axial direction based on the N acceleration values in the first axial direction;
• obtaining N acceleration values in a second axial direction collected from N times sampling within the preset time period through the accelerometer mounted on the wheel;
• and obtaining a maximum acceleration change value in the second axial direction based on the N acceleration values in the second axial direction;
• wherein the first axial direction is perpendicular to the second axial direction;
• determining whether the vehicle is in motion or in a first stationary state based on the N acceleration values in the first axial direction and the N acceleration values in the second axial direction;
• and
• in response to the vehicle being determined to be in the first stationary state, further determining whether the vehicle is in motion or in a second stationary state based on the maximum acceleration change value in the first axial direction and the maximum acceleration change value in the second axial direction;
• in response to the vehicle being determined to be in the second stationary state, adjusting a tire pressure monitoring system to a sleep mode.

A system for monitoring a motion status of a vehicle comprising an accelerometer and a processor coupled to each other;

• wherein the accelerometer is configured to detect an acceleration value in a first axial direction and an acceleration value in a second axial direction of a tire of the vehicle, the first axial direction being perpendicular to the second axial direction;
• the processor is configured to perform:
• obtaining N acceleration values in a first axial direction collected from N times sampling within a preset time period through an accelerometer mounted on a wheel;
• and obtaining a maximum acceleration change value in the first axial direction based on the N acceleration values in the first axial direction;
• obtaining N acceleration values in a second axial direction collected from N times sampling within the preset time period through the accelerometer mounted on the wheel;
• and obtaining a maximum acceleration change value in the second axial direction based on the N acceleration values in the second axial direction;
• wherein the first axial direction is perpendicular to the second axial direction;
• determining whether the vehicle is in motion or in a first stationary state based on the N acceleration values in the first axial direction and the N acceleration values in the second axial direction;
• and
• in response to the vehicle being determined to be in the first stationary state, further determining whether the vehicle is in motion or in a second stationary state based on the maximum acceleration change value in the first axial direction and the maximum acceleration change value in the second axial direction;
• in response to the vehicle being determined to be in the second stationary state, adjusting a tire pressure monitoring system to a sleep mode.