Tire deflation warning system and method thereof, and judgment program of tire with reduced pressures
First Claim
1. A tire deflation warning system including a means for detecting rotational speeds of wheels on a vehicle having driving wheels and following wheels, for obtaining rotational speed information of the wheels, and a means for judging tires with reduced air pressure from the rotational speed information of the wheels, the system comprising:
- a means for determining whether (1) the vehicle has run a fixed distance from starting and (2) the speed of the vehicle is more than a fixed value;
a means for judging whether driving force works to respective wheels or not;
a means for calculating a vehicle speed when driving force works to respective wheels;
a means for comparing (1) a ratio R of an average of the rotational speeds of the driving wheels against an average of the rotational speeds of the following wheels, in running state in which the vehicle has driving force, with (2) an initial value of an average of the rotational speeds of the driving wheels against an average of the rotational speeds of the following wheels at normal air pressure, in running state in which the vehicle has driving force, to obtain a ratio R/initial value; and
a means for judging that the air pressures of the all wheels which are mounted on the vehicle are simultaneously reduced, or that the air pressures of the driving wheels are reduced by comparing the ratio R/initial value with (1) a preliminarily determined judging threshold for reduced pressures of all wheels or (2) a preliminarily determined judging threshold for reduced pressures of the driving wheels.
1 Assignment
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Accused Products
Abstract
A tire deflation warning system having a means for detecting the rotational speeds of wheels on a vehicle and a means for judging tires with reduced air pressure from the rotational speed information of the wheels including a means for judging whether driving force works to respective wheels or not a means for calculating a vehicle speed when driving force works to respective wheels, a means for comparing the average of the rotational speeds of the driving wheels against the average of the rotational speeds of the following wheels, with the average of the rotational speeds of the driving wheels against the average of the rotational speeds of the following wheels at normal air pressure in running state in which the vehicle has driving force and a means for judging that the air pressures of the all wheels which are mounted on the vehicle are simultaneously reduced, or that the air pressures of the driving wheels are reduced by the result of the comparison.
6 Citations
6 Claims
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1. A tire deflation warning system including a means for detecting rotational speeds of wheels on a vehicle having driving wheels and following wheels, for obtaining rotational speed information of the wheels, and a means for judging tires with reduced air pressure from the rotational speed information of the wheels, the system comprising:
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a means for determining whether (1) the vehicle has run a fixed distance from starting and (2) the speed of the vehicle is more than a fixed value; a means for judging whether driving force works to respective wheels or not; a means for calculating a vehicle speed when driving force works to respective wheels; a means for comparing (1) a ratio R of an average of the rotational speeds of the driving wheels against an average of the rotational speeds of the following wheels, in running state in which the vehicle has driving force, with (2) an initial value of an average of the rotational speeds of the driving wheels against an average of the rotational speeds of the following wheels at normal air pressure, in running state in which the vehicle has driving force, to obtain a ratio R/initial value; and a means for judging that the air pressures of the all wheels which are mounted on the vehicle are simultaneously reduced, or that the air pressures of the driving wheels are reduced by comparing the ratio R/initial value with (1) a preliminarily determined judging threshold for reduced pressures of all wheels or (2) a preliminarily determined judging threshold for reduced pressures of the driving wheels. - View Dependent Claims (2)
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3. A judgment method for tires with reduced air pressure which judges tires with reduced air pressure using rotational speed information of wheels mounted on a vehicle having driving wheels and following wheels, the method comprising the steps of:
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determining whether (1) the vehicle has run a fixed distance from starting and (2) the speed of the vehicle is more than a fixed value; judging whether driving force works to respective wheels or not; calculating a vehicle speed when driving force works to respective wheels; comparing (1) a ratio R of an average of the rotational speeds of the driving wheels against the average of the rotational speeds of the following wheels, in running state in which the vehicle has driving force, with (2) an initial value of an average of the rotational speeds of the driving wheels against an average of the rotational speeds of the following wheels at normal air pressure, in running state in which the vehicle has driving force, to obtain a ratio R/initial value; and judging that the air pressures of the all wheels which are mounted on the vehicle are simultaneously reduced, or that the air pressures of the driving wheels are reduced by comparing the ratio R/initial value with (1) a preliminarily determined judging threshold for reduced pressures of all wheels or (2) a preliminarily determined judging threshold for reduced pressures of the driving wheels. - View Dependent Claims (4)
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5. A judgment program of the reduced pressures of tires for functionalizing a computer as a memory means of memorizing rotational speeds of wheels mounted on a vehicle having driving wheels and following wheels comprising;
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a means for determining whether (1) the vehicle has run a fixed distance from starting and (2) the speed of the vehicle is more than a fixed value; a means for judging whether driving force works to respective wheels or not; a means for calculating a vehicle speed when driving force works to respective wheels; and a means for detecting that the air pressures of the all wheels which are mounted on the vehicle are reduced, or that the air pressures of the driving wheels are reduced by comparing (1) a ratio R of an average of the rotational speeds of the driving wheels against the average of the rotational speeds of the following wheels, in running state in which the vehicle has driving force, with (2) an initial value of an average of the rotational speeds of the driving wheels against the average of the rotational speeds of the following wheels at normal air pressure, in running state in which the vehicle has driving force, in order to judge tires with reduced air pressure, to obtain a ratio R/initial value; and comparing the ratio R/initial value with (1) a preliminarily determined judging threshold for reduced pressures of all wheels or (2) a preliminarily determined judging threshold for reduced pressures of the driving wheels. - View Dependent Claims (6)
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Specification