Air pressure detection device

• US 20050097948A1
• Filed: 11/10/2004
• Published: 05/12/2005
• Est. Priority Date: 11/12/2003
• Status: Active Grant

• Current Assignee: Fuji Heavy Industries Limited (Subaru Corp.)
• Original Assignee: Fuji Heavy Industries Limited (Subaru Corp.)
• Inventors: Suzuki, Akira
• Granted Patent: US 7,146,852 B2
• Time in Patent Office: Days
• US Class Current: 73/146
• CPC Class Codes: B60C 23/0416 allocating a corresponding wheel position on vehicle, e.g. front/left or rear/right

Abstract

Speed detecting sections 8 which detect the speeds of the respective wheels 2 at the hub sides of the axles 7 are provided, and by comparing the speeds of the respective wheels 2 detected by the speed detecting sections 8 for each two wheels 2 on each axle 7, the speed deflections of the axles 7 are calculated, and from comparison between the speed deflections, the axle 7 with the larger speed deflection between the axles 7 is judged as a pressure lowered tire existing axle. Between two wheels 2 on the pressure lowered tire existing axle, a tire 5 of the wheels 2 with the higher speed is judged as the pressure lowered tire.

Claims

1. An air pressure detection device, comprising:

pressure detecting sections respectively disposed on four wheels for detecting air pressures in tires;

a receiving section disposed on a vehicle body side for receiving tire pressure values transmitted from the pressure detecting sections;

speed detecting sections respectively disposed on hub sides of axles for detecting the speeds of the four wheels;

a speed deflection calculating section for calculating speed deflections of the front side and rear side axles by comparing the speeds of the wheels detected for each two left and right wheels on the front and rear sides; and

a pressure lowered tire position judging section for judging an axle with a larger speed deflection between the front side and rear side axles as a pressure lowered tire existing axle by comparing the speed deflections, and judging a tire of a wheel with the higher speed between the two wheels on the pressure lowered tire existing axle as a pressure lowered tire.

2. The air pressure detection device according to claim 1, further comprising:

a pressure lowering informing section for informing a driver of a positional information and an air pressure information of the pressure lowered tire when the tire pressure value of the tire judged as the pressure lowered tire is lower than a predetermined tire pressure alarming value.

3. The air pressure detection device according to claim 1, wherein the speed detecting sections comprise speed detectors of an anti-lock braking system.

4. The air pressure detection device according to claim 2, wherein the speed detecting sections comprise speed detectors of an anti-lock braking system.

5. An air pressure detection device, comprising:

pressure detecting means respectively disposed on four wheels for detecting air pressures in tires;

receiving means disposed on a vehicle body side for receiving tire pressure values transmitted from the pressure detecting means;

speed detecting means respectively disposed on hub sides of axles for detecting the speeds of the four wheels;

speed deflection calculating means for calculating speed deflections of the front side and rear side axles by comparing the speeds of the wheels detected for each two left and right wheels on the front and rear sides; and

pressure lowered tire position judging means for judging an axle with a larger speed deflection between the front side and rear side axles as a pressure lowered tire existing axle by comparing the speed deflections, and judging a tire of a wheel with the higher speed between the two wheels on the pressure lowered tire existing axle as a pressure lowered tire.

6. The air pressure detection device according to claim 5, further comprising:

pressure lowering informing means for informing a driver of a positional information and an air pressure information of the pressure lowered tire when the tire pressure value of the tire judged as the pressure lowered tire is lower than a predetermined tire pressure alarming value.

7. The air pressure detection device according to claim 5, wherein the speed detecting means comprises speed detector of an anti-lock braking system.

8. The air pressure detection device according to claim 6, wherein the speed detecting means comprises speed detector of an anti-lock braking system.