摘要:
A tyre air-pressure abnormality alarm device for informing decrease in air-pressure of tyres attached to a four-wheeled vehicle, characterised in that the device prohibits start of initialising operations for updating stored values for physical amounts related to tyres or wheels in the case where air-pressures of the tyres are judged to be normal, if air-pressure abnormality of a tyre is being alarmed. Initialisation is accepted only after the internal pressure has become normal, whereby erroneous initialisation with any tyre being in a decompressed condition can be prevented. Thus, normal operations for detecting decompression of a tyre can be maintained.
摘要:
A method for detecting a tire having a decreased air pressure based on wheel rotation information to be obtained from the tire attached to a vehicle in which there is a predetermined difference between a front wheel load and a rear wheel load. The method includes a step of acquiring the wheel rotation information to be obtained from the tire, a step of storing the wheel rotation information, a step of acquiring a load sensitivity of a tire dynamic loaded radius due to a load shift during a turning, a step of acquiring a speed dependency of the load sensitivity, a step of comparing a load sensitivity of a tire dynamic loaded radius at a speed acquired based on the speed dependency with preliminarily stored load sensitivities of dynamic loaded radiuses of various tires, a step of estimating a decreased pressure sensitivity of the tire dynamic loaded radius based on a result of the comparison, and a step of determining that the tire has a decreased air pressure based on a result of the estimation. The speed dependency is acquired from a change of a front and rear wheel speed ratio.
摘要:
A tire deflation warning system (10) having a means (2) 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 (1) 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 (4,5) 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.
摘要:
To provide an apparatus, method and program for alarming decrease in tire air-pressure which enable to detect decrease in air-pressure of all of four-wheels tires at reduced costs. The apparatus for alarming decrease in tire air-pressure includes means of (1) detecting decrease in tire air-pressure by measuring change of parameter in relation to resonance condition in the tire, and (2) detecting decrease in tire air-pressure by making relative comparison of dynamic loaded radii of tires, wherein the means (1) is included in one to three-wheel tires on a four-wheel vehicle.
摘要:
An apparatus for identifying between summer tyres and winter tyres based on rotational information obtained from tyres attached to a four-wheeled vehicle equipped with a limited slip differential device (7). The apparatus comprises a rotational information detecting means (1) for detecting rotational information for each of the tyres, a memory means for storing rotational information of each of the tyres, an arithmetic processing means for respectively calculating reciprocals of rolling radii based on rotations information of tyres attached to a driving shaft (5) as well as judged value based on rotational information of each of the tyres, and an identification means for identifying whether the tyres attached to the driving shaft are summer tyres or winter tyres from a relationship between reciprocals of turning radii and the judged value.
摘要:
A tyre identifying method comprising measuring the rotational speed of each of the four tyres fitted to the wheels of a vehicle; calculating a ratio of front wheel rotation speed to rear wheel rotation speed from the measured value; and identifying the kind of tyre fitted by comparing the calculated front-rear wheel ratio with a function of speed and front-rear wheel ratio prepared on the basis of data from, the tyre whose kind is previously known. Utilisation can be made of the means for measuring the rotation of tyre such as ABS which is equipped on the vehicle control device, thus requiring small initial cost.
摘要:
The method includes: a step of calculating wheel rotation information; a judgment step of judging a decrease in a tire air pressure by comparing a predetermined reference value with a decreased pressure judgment value showing a wheel speed ratio of the front and rear axes; an initialization step of storing the wheel speed ratio between the front and rear axes at the regular internal pressure; and a step of determining whether the distribution of the front and rear driving torque is equidistribution or not.