Detection device for decreased tire pressures and method thereof

Abstract

To provide a device for detecting whether heterogeneous tires are mounted on the respective left and right driving wheels or not and accurately detecting the decreased tire pressures. The detection device of heterogeneous tires of the present invention is equipped with a means for detecting the rotational speeds of wheels mounted on a vehicle, a means for detecting torque applied to driving wheels, and a calculation means for calculating the inclinations of regression straight lines of respective relations from relation between the rotational speed ratio of the front and rear wheels in the left side wheels of the vehicle and torque applied to driving wheels and relation between the rotational speed ratio of the front and rear wheels in the right side wheels of the vehicle and the torque, and detects that heterogeneous tires are mounted on the driving wheels by comparing the inclination of regression straight line of the relation of the left side wheels with the inclination of regression straight line of the relation of the right side wheels. The detection device of the decreased tire pressures of the present invention changes the threshold for judging tire deflation to a threshold in a case of loading heterogeneous tires when it detects that the heterogeneous tires are mounted on the driving wheels.

Description

technical field [0001] The invention relates to a detection device and method for detecting the pressure drop of a tire installed on a vehicle. In particular, the present invention relates to an apparatus and method for accurately detecting a drop in tire pressure by detecting differences in types of tires mounted on a vehicle. Background technique [0002] When the pressure in the tires installed on your vehicle drops, fuel mileage decreases and there is a risk of flat tires at high speeds. As tire pressure decreases, the drop in pressure can be measured by taking advantage of changes in tire properties such as a decrease in the tire's dynamically loaded radius and a change in resonant frequency. [0003] For example, the principle used by the traditional tire pressure drop detection device is: because the tire outer diameter (the dynamic load radius of the tire) decreases more than the tire with normal internal pressure when the pressure of ...

AI Technical Summary

Problems solved by technology

In addition, when the types of tires mounted on the left and right driving wheels are different, the driving performance of the left and right is different, and problems such as longer braking distances may arise due to slippage and poor brake operation.

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