摘要:
A tire air-pressure alarming device includes wheel speed sensors for detecting wheel speeds of wheels of a motor vehicle and also includes a microcomputer-base control device and an alarming unit. The control device is programmed to execute function steps of: deriving a decision value based on the wheel speeds detected by the wheel speed sensors; judging the occurrence of air-pressure drop of the tires constituting wheels, based on the decision value; and outputting a command when the occurrence of the air-pressure drop of the tires is judged. The alarming unit is responsive to the command from the control device thereby to raise an alarm indicating the occurrence of the air-pressure drop of the tire. The tires are monitored by the tire air-pressure alarming device, wherein the control device is also programmed to execute a function step of standardizing the speed dependency of a rolling radius of the tires thereby to standardize the performance in judging the air-pressure drop of the tires. Thus, the tire property can be controlled to improve the accuracy in detecting the tire air-pressure drop.
摘要:
A tire air-pressure alarming device includes wheel speed sensors for detecting wheel speeds of wheels of a motor vehicle and also includes a microcomputer-base control device and an alarming unit. The control device is programmed to execute function steps of: deriving a decision value based on the wheel speeds detected by the wheel speed sensors; judging the occurrence of air-pressure drop of the tires constituting wheels, based on the decision value; and outputting a command when the occurrence of the air-pressure drop of the tires is judged. The alarming unit is responsive to the command from the control device thereby to raise an alarm indicating the occurrence of the air-pressure drop of the tire. The tires are monitored by the tire air-pressure alarming device, wherein the control device is also programmed to execute a function step of standardizing the speed dependency of a rolling radius of the tires thereby to standardize the performance in judging the air-pressure drop of the tires. Thus, the tire property can be controlled to improve the accuracy in detecting the tire air-pressure drop.
摘要:
A system for detecting deflated tires by making a relative comparison among rotation speeds of tires attached to a vehicle. The system includes a rotation speed information detection means for detecting rotation speed information of the tires; a rotation speed calculation means for calculating rotation speeds of the tires; and a determination means for determining deflated tires by comparing a decreased pressure determination value using the calculated rotation speeds with a predetermined threshold value. The determination means determines that the vehicle is going straight when it is found, with regard to factors composed of a lateral G, a yaw rate, and a steering angle of the vehicle, at least two of the factors including the yaw rate show that a difference between the maximum value and the minimum value at a predetermined time is lower than a predetermined value, thereby detecting deflated tires.
摘要:
A method for detecting a tire having decreased air pressure based on wheel rotation information obtained from the tire attached to a vehicle in which there is a predetermined difference between front and rear wheel loads. The method includes the steps of acquiring wheel rotation information obtained from the tire, storing the wheel rotation information, acquiring a load sensitivity of a tire dynamic loaded radius due to load shift during turning, acquiring speed dependency of the load sensitivity, comparing load sensitivity of the 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, estimating decreased pressure sensitivity of the tire dynamic loaded radius based on a result of the comparison, and determining that the tire has a decreased air pressure based on a result of the estimation.
摘要:
An apparatus for calculating an initial correction coefficient for correcting rotational angular velocities obtained from outputs of rotational angular velocity detecting means. The apparatus includes a judged value calculating means which calculates a judged value on the basis of the rotational angular velocities; an identifying means which identifies whether the vehicle is performing turning movements at high velocity, straight-ahead running or turning movements at mid/low velocity; and an initial correction coefficient calculating means which obtains an initial correction coefficient when it has been identified by the identifying means that the vehicle is performing straight-ahead running or turning movements at mid/low velocity. It is possible to obtain accurate correction coefficients so that it is possible to accurately detect, for instance, a decrease in tire air-pressure and thus to maintain safe running.
摘要:
A pneumatic radial tire comprising a carcass and a belt comprising belt plies composed of steel belt cords wherein at least two circumferential grooves are constructed in the tread part continuously in the direction of the tire's equator, and lateral grooves in some parts defined by dividing the tread part in the direction of the tire's axis into approximately three or four equal areas. The tire prevents one-side drifting of a car in driving, improves a straight-forward driving performance.
摘要:
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.
摘要:
A detection method of reducing the air pressure of tires based on the rotational speed of wheels mounted on a vehicle. The method includes steps of: determining the rotational speed of each wheel, memorizing the rotational speed of each wheel, determining the loading sensitivity of the dynamic load radius of tires caused by movement of a load during turning, comparing said loading sensitivity with the loading sensitivity of the dynamic load radii of tires at initialization which are preliminarily memorized, and judging decompression of tires based on the result of the comparison. Further, a loading sensitivity-calculating method of determining the loading sensitivity of the dynamic load radii of tires includes steps of: determining a lateral acceleration during turning of a vehicle, determining the shift rate of a judgment value which is the relative comparison of rotational speed of wheels on a pair of diagonals of a vehicle, and determining the loading sensitivity.
摘要:
A method for detecting decrease in tire air-pressure in which decrease in internal pressure of a tire is detected on the basis of rotational information. The method includes the steps of: detecting rotational information of the tires; storing the rotational information; comparing rotational information of all left-sided wheels and rotational information of all right-sided wheels of the vehicle when the vehicle is performing straight-ahead running; and judging decompression on the basis of a relationship between a value obtained through comparison of the left-sided and right-sided rotational information and a specified threshold. It is possible to detect decompression of a single wheel tire while it is also possible to detect that two wheel tires on the left or right are simultaneously decreased.
摘要:
An apparatus for alarming decrease in tire air-pressure which alarms decrease of internal pressure of a tire on the basis of a rotational information obtained by tires attached to a four-wheeled vehicle. The apparatus comprises rotational information detecting means; memory means for storing the rotational information; calculation processing means for calculating a reciprocal number of a turning radius and calculating a judged value; first judging means for comparing the judged value with a reference value at every regions of the turning radius; and second judging means for canceling a judgement of decrease of internal pressure when a difference between the judged values in the right and left turning regions is different from a difference between reference judged values in the right and left turning regions which are obtained at a time of initializing run.