Apparatus for alarming decrease in tire air-pressure and method thereof
First Claim
1. An apparatus for alarming a decrease in internal air-pressure of a tire based on rotational information obtained from tires attached to a four-wheeled vehicle, the apparatus comprising:
- a rotational information detecting means for detecting rotational information of each tire;
a storing means for storing the rotational information of each tire and relationships between relative speed ratios of right and left tires of different types of driving wheels which have been preliminarily set to be of normal air-pressure and driving force;
a calculating and processing means for calculating determined values from rotational information of each tire; and
a determining means for correcting relative speed ratios of right and left tires of different types of driving wheels at the time of actual running of the vehicle, the correcting being based on the relationship between the relative speed ratio of right and left tires of different types of driving wheels and driving force, and for determining a decrease in internal pressure of a tire;
whereinthe determining means determines how relative speed ratios of right and left tires vary according to driving force.
1 Assignment
0 Petitions
Accused Products
Abstract
An apparatus for alarming decrease in internal air-pressure of a tire based on rotational information obtained from tires attached to a four-wheeled vehicle. A relative speed ratio of driving wheels at the time of actual running is corrected based on a preliminarily relationship between the relative speed ratio of right and left tires of different types of driving wheels and driving force, and decrease in internal pressure of a tire is determined. The accuracy for determining decrease in internal pressure of a tire can be improved, and erroneous alarm or failure in alarm can be prevented.
26 Citations
19 Claims
-
1. An apparatus for alarming a decrease in internal air-pressure of a tire based on rotational information obtained from tires attached to a four-wheeled vehicle, the apparatus comprising:
-
a rotational information detecting means for detecting rotational information of each tire; a storing means for storing the rotational information of each tire and relationships between relative speed ratios of right and left tires of different types of driving wheels which have been preliminarily set to be of normal air-pressure and driving force; a calculating and processing means for calculating determined values from rotational information of each tire; and a determining means for correcting relative speed ratios of right and left tires of different types of driving wheels at the time of actual running of the vehicle, the correcting being based on the relationship between the relative speed ratio of right and left tires of different types of driving wheels and driving force, and for determining a decrease in internal pressure of a tire;
whereinthe determining means determines how relative speed ratios of right and left tires vary according to driving force. - View Dependent Claims (2, 3, 4, 5)
-
-
6. An apparatus for alarming a decrease in internal air-pressure of a tire based on rotational information obtained from tires attached to a four-wheeled vehicle, the apparatus comprising:
-
a rotational information detecting means for detecting rotational information of each tire; a storing means for storing the rotational information of each tire and relationships between relative speed ratios of right and left tires of different types of driving wheels which have been preliminarily set to be of normal air-pressure and vehicle speed; a calculating and processing means for calculating determined values from rotational information of each tire; and a determining means for correcting relative speed ratios of right and left tires of different types of following wheels at the time of actual running of the vehicle, the correcting being based on the relationship between the relative speed ratio of right and left tires of different types of following wheels and vehicle speed, and for determining a decrease in internal pressure of a tire;
whereinthe determining means determines how relative speed ratios of right and left tires vary according to driving force. - View Dependent Claims (7, 8, 9)
-
-
10. An apparatus for alarming a decrease in internal air-pressure of a tire based on rotational information obtained from tires attached to a four-wheeled vehicle, the apparatus comprising:
-
a rotational information detecting means for detecting rotational information of each tire; a storing means for storing the rotational information of each tire and relationships among relative speed ratios of right and left tires of different types of driving wheels which have been preliminarily set to be of normal air-pressure, vehicle speed and driving force; a calculating and processing means for calculating determined values from rotational information of each tire; and a determining means for correcting relative speed ratios of right and left tires of different types of driving wheels at the time of actual running of the vehicle, the correcting being based on the relationship between the relative speed ratio of right and left tires of different types of driving wheels, vehicle speed and driving force, and for determining a decrease in internal pressure of a tire;
whereinthe determining means determines how relative speed ratios of right and left tires vary according to driving force. - View Dependent Claims (11, 12)
-
-
13. A method for detecting a decrease in the air pressure of a tire mounted on a vehicle, the method comprising:
-
initiating an initialization period while the vehicle is in motion; during the initialization period, determining rotational relationships between vehicle tires; determining how right and left wheel speed ratios vary according to driving force using the rotational relationships; storing the rotational relationships between the vehicle tires; and during running of the vehicle, detecting rotational information from the vehicle tires. - View Dependent Claims (14, 15, 16, 17, 18, 19)
-
Specification