Abstract: A wireless tire pressure sensing device, a method for setting a standard tire pressure thereof and a wireless tire pressure sensing activation device adjust the tire pressure of each tire in a vehicle to a standard tire pressure according to a requirement of the vehicle after the wireless tire pressure sensing device is mounted in each tire, maintain each tire at the standard tire pressure for a preset time period or employ the wireless tire pressure sensing activation device to transmit a setup instruction to the wireless tire pressure sensing device to set a current tire pressure as the standard tire pressure. The wireless tire pressure sensing device can be set up with the standard tire pressure and conveniently modified. As no threshold value of tire pressure needs to be pre-stored, wireless tire pressure sensing devices with different threshold values are not necessarily prepared beforehand, thereby effectively lowering the stocking pressure on inventory management.

Abstract: An anti-interference antenna of a wireless tire pressure receiver has an insulating cable having a main casing and a sub-casing connected side by side with the main casing. The main casing has a power cable longitudinally mounted through the main casing. The sub-casing has an antenna longitudinally mounted through the sub-casing. As the antenna is individually sleeved by the insulating sub-casing, the antenna and the power cables are isolated to prevent from interfering with each other. Besides, the insulating cable further has at least one air channel longitudinally formed through the corresponding cable and mounted with a metal layer on an inner wall of the air channel, around the power cable, around each of power wires in the power cable, or around the power cable and the air channel, and filled with an EMI-shielding matter to further isolate the antenna and the power cables.

Abstract: A valve stem for a wireless tire pressure detector has a tube and a hollow and elastic mounting barrel. The tube has an inflating end, a connecting end, a lower flange, an upper flange and an annular groove. The lower flange is formed on and protrudes from the tube near the connecting end. The upper flange is formed on and protrudes from the tube near the inflating end. The annular groove is formed around the tube between the flanges. The mounting barrel is securely mounted around the tube between the flanges and has an engaging segment, a mounting segment, a mounting hole and an annular protrusion. The engaging segment abuts against the lower flange. The mounting segment is formed with the engaging segment and abuts against the upper flange. The annular protrusion is formed on and protrudes from an internal surface of the mounting barrel and engages the annular groove.

Abstract: A wireless tire pressure sensing device, a method for setting a standard tire pressure thereof and a wireless tire pressure sensing activation device adjust the tire pressure of each tire in a vehicle to a standard tire pressure according to a requirement of the vehicle after the wireless tire pressure sensing device is mounted in each tire, maintain each tire at the standard tire pressure for a preset time period or employ the wireless tire pressure sensing activation device to transmit a setup instruction to the wireless tire pressure sensing device to set a current tire pressure as the standard tire pressure. The wireless tire pressure sensing device can be set up with the standard tire pressure and conveniently modified. As no threshold value of tire pressure needs to be pre-stored, wireless tire pressure sensing devices with different threshold values are not necessarily prepared beforehand, thereby effectively lowering the stocking pressure on inventory management.

Abstract: A tire pressure detecting apparatus has a micro-controller, a detecting module and a transceiver. The detecting module is electronically connected to the micro-controller and has a tire pressure detecting unit controlled by the micro-controller to detect a tire pressure inside a tire. The transceiver is electronically connected to the micro-controller, transmits a high frequency signal corresponding to detected characteristic tire parameters from the detecting module to a monitoring system inside a car and receives an external high frequency signal sent from external tire pressure detecting apparatus for the micro-controller, with the micro-controller temporarily delaying sending of the high frequency signal until a waiting time has expired to prevent signal collision between the high frequency signal and the external high frequency signal.

Abstract: A tire pressure detecting apparatus has an identification rewriteable tire pressure detector and a setting apparatus. The tire pressure detector is securely mounted on a valve stem inside a tire of a vehicle and has a micro-processing module, a sensing module, a transmitting module and a receiving interface, where the micro-processing module has a memory unit. The setting apparatus is capable of reading or inputting an identification from a failure tire pressure detector, transmits the identification to the identification rewriteable tire pressure detector and writes the identification into the memory unit.

Abstract: A valve stem assembly for clamping tire pressure detector has a valve stem and a fastener. The valve stem has an outer section and an inner section. The inner section has a distal end, an outlet hole, a sidewall and a side fixing hole. The distal end has a domical surface. The outlet hole is centrally formed through the domical surface. The side fixing hole is formed in the inner section, is oblique to the outlet hole and communicates with the outlet hole inside the inner section. The fastener corresponds to the outlet hole and the side fixing hole and is selectively and detachably and selectively screwed into the outlet hole or the side fixing hole to hold a tire pressure detector on the valve stem assembly.

Abstract: A valve stem with a connecting cap for a tire pressure detector has a body, a connecting cap and a fastener. The body is tubular, is a valve stem applied for truck and has an outer section, an inner section and a fixing nut. The inner section is integrally formed coaxially on the outer section and has an outlet hole being formed thereon. The fixing nut is movably mounted on the outer section. The connecting cap is cylinder, has an outer end and a hole and is detachably mounted on the inner section. The hole is coaxially and longitudinally formed on the connecting cap. The fastener corresponds to the hole and the outlet hole and holds a wireless pressure detector on the outer end of the connecting cap.

Abstract: A valve stem with an adjustable tire pressure detector has a tire pressure detector, a valve stem body, a conducting member and a fastening assembly. The tire pressure detector has a guiding slot, a concave surface and a convex surface. The guiding slot is formed through the tire pressure detector and forms two openings. The concave surface and the convex surface are formed on the tire pressure detector respectively adjacent to the openings. The valve stem body is moveably mounted through the guiding slot and has a head being moveably mounted on the concave surface. The conducting member is mounted on the concave surface or the convex surface and is electrically contacted to the valve stem body and the tire pressure detector. The fastening assembly mounts the valve stem body on a rim securely.

Abstract: A valve stem assembly for tire pressure detecting systems has a valve stem, a connector and a tire pressure detector. The valve stem is conductive. The connector is connected coaxially on the valve stem and is conductive and has a connecting section. The connecting section has an adjusting slot and a domical end. The adjusting slot is formed through the connecting section. The tire pressure detector has at least one tab and at least one conducting washer, the at least one tab protrudes from the tire pressure detector, corresponds to and is adjustably mounted on the connecting section. The at least one tab has a tab slot being formed therethrough. A bolt assembly is mounted in the tab slot and the adjusting slot to hold the tire pressure detector on the connector.

Abstract: A tire pressure monitoring system with an intermediate bluetooth interface has at least one character detector, an intermediate transceiver and a portable apparatus. The character detector is securely formed inside a tire of a vehicle, detects a tire pressure or an interior temperature inside the tire and sends out a low power consumption electromagnetic wave signal. The intermediate transceiver receives the low power consumption electromagnetic wave signals, transforms the low power consumption electromagnetic wave signals to bluetooth signals and sends out the bluetooth signals. The portable apparatus has a monitor, is portable and receives the bluetooth signals to display information corresponding to the tire pressure or the interior temperature of the tire on the monitor to a person.

Abstract: A valve stem with a connecting cap for a tire pressure detector has a body, a connecting cap and a fastener. The body is tubular, is a valve stem applied for truck and has an outer section, an inner section and a fixing nut. The inner section is integrally formed coaxially on the outer section and has an outlet hole being formed thereon. The fixing nut is movably mounted on the outer section. The connecting cap is cylinder, has an outer end and a hole and is detachably mounted on the inner section. The hole is coaxially and longitudinally formed on the connecting cap. The fastener corresponds to the hole and the outlet hole and holds a wireless pressure detector on the outer end of the connecting cap.

Abstract: A tire pressure detecting valve stem has a case, a body and a tire pressure detector. The case is rectangular and has an inner surface. The body is a valve stem and is integrally and transversely mounted on the case and has an inner section and a center pin. The inner section is integrally mounted in the case. The center pin is conductive, is coaxially mounted in the inner section and protrudes from the inner surface of the case. The tire pressure detector corresponds to and is mounted on the inner surface and is electronically connected to the center pin. Because the case is integrally and compactly mounted on the inner section of the body, the case will be mounted on and stay close to a rim when the body is mounted through the rim.

Abstract: The tire pressure detector and valve stem assembly has a valve stem, a wireless pressure detector and a fastener. The valve stem has an outer section and an inner section. The inner section is integrally and coaxially formed on the outer section and has a distal end, an outlet hole, a sidewall and at least one clamping surface. The at least one clamping surface is flat and is tangentially formed on the sidewall. To assemble, only a regular tool such as a clamp or a spanner is necessary to clamp the inner section on the clamping surface when mounting or dismounting the valve stem onto or from a rim.