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#1
posted to rec.boats
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Tire pressure indicators
They are actually miniature pressure sensing devices and radio
transmitters. They can sense (and report) a drop in the tire pressure vs. a pre-programmed setting. They "talk" with a radio transmitter-receiver in the car computer (somewhat similar to a wireless Internet connection -WiFi or BlueTooth). The way they work is as follows: 1) With tires pressure adjusted at the correct value, they get "calibrated" by the car computer. Basically, the car computer send a radio signal to the sensors mounted in the wheels to "learn" the pressure and keep it as reference for future measurements. The calibration is usually done by pressing a button on the car's dashboard for 5 seconds or so. 2) Once calibrated, and with the ignition ON, the car computer "asks" the tire pressure sensors to check the pressure and report back if it is OK. The frequency with which the car computer communicates with the sensors varies, but it can be as frequent as once every 5 seconds, or as low as once every time the ignition is connected. The rest of the time, the sensors are in a "stand by" mode consuming very low battery power (same order of magnitude as a digital wrist watch). They only become "alive" when activated by a digital radio code sent from the car computer. 3) If the sensor detects that the pressure is signifcantly lower than the normal value it was calibrated for, it will send a "Not OK" signal back to the car computer, which will inform you via a warning light. The technology combines developments from things like radio frequency tags and wireless digital communication (Wifi, BlueTooth). The interesting part is that because it only activates the sensors from time to time, and the whole process takes miliseconds, the power consumption is very low and the batteries in the sensors last very long - typically as long as a set of tires, so the batteries have to be replaced only when a new set of tires is installed. Because specific sensors are designed to work with specific car computer, I don't think they will work on trailer tires. Maybe if your car is already equipped with low tire pressure alarm, your could try to install the same type/brand of sensors which are installed in the car's tires on the trailer. However, typically the car computer expects to "talk" with four sensors at the same time, so hearing back from six may confuse it (with upredictable results). Also, the transmission power may not be enough to cover the distance from the trailer wheels to the car computer. |
#2
posted to rec.boats
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Tire pressure indicators
"katekebo" wrote in message oups.com... They are actually miniature pressure sensing devices and radio transmitters. They can sense (and report) a drop in the tire pressure vs. a pre-programmed setting. They "talk" with a radio transmitter-receiver in the car computer (somewhat similar to a wireless Internet connection -WiFi or BlueTooth). The way they work is as follows: 1) With tires pressure adjusted at the correct value, they get "calibrated" by the car computer. Basically, the car computer send a radio signal to the sensors mounted in the wheels to "learn" the pressure and keep it as reference for future measurements. The calibration is usually done by pressing a button on the car's dashboard for 5 seconds or so. 2) Once calibrated, and with the ignition ON, the car computer "asks" the tire pressure sensors to check the pressure and report back if it is OK. The frequency with which the car computer communicates with the sensors varies, but it can be as frequent as once every 5 seconds, or as low as once every time the ignition is connected. The rest of the time, the sensors are in a "stand by" mode consuming very low battery power (same order of magnitude as a digital wrist watch). They only become "alive" when activated by a digital radio code sent from the car computer. 3) If the sensor detects that the pressure is signifcantly lower than the normal value it was calibrated for, it will send a "Not OK" signal back to the car computer, which will inform you via a warning light. The technology combines developments from things like radio frequency tags and wireless digital communication (Wifi, BlueTooth). The interesting part is that because it only activates the sensors from time to time, and the whole process takes miliseconds, the power consumption is very low and the batteries in the sensors last very long - typically as long as a set of tires, so the batteries have to be replaced only when a new set of tires is installed. Because specific sensors are designed to work with specific car computer, I don't think they will work on trailer tires. Maybe if your car is already equipped with low tire pressure alarm, your could try to install the same type/brand of sensors which are installed in the car's tires on the trailer. However, typically the car computer expects to "talk" with four sensors at the same time, so hearing back from six may confuse it (with upredictable results). Also, the transmission power may not be enough to cover the distance from the trailer wheels to the car computer. Where are the pressure sensing devices located? The wheels are sealed. |
#3
posted to rec.boats
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Tire pressure indicators
"Harry Krause" wrote in message ... Bishoop wrote: "katekebo" wrote in message oups.com... They are actually miniature pressure sensing devices and radio transmitters. They can sense (and report) a drop in the tire pressure vs. a pre-programmed setting. They "talk" with a radio transmitter-receiver in the car computer (somewhat similar to a wireless Internet connection -WiFi or BlueTooth). The way they work is as follows: 1) With tires pressure adjusted at the correct value, they get "calibrated" by the car computer. Basically, the car computer send a radio signal to the sensors mounted in the wheels to "learn" the pressure and keep it as reference for future measurements. The calibration is usually done by pressing a button on the car's dashboard for 5 seconds or so. 2) Once calibrated, and with the ignition ON, the car computer "asks" the tire pressure sensors to check the pressure and report back if it is OK. The frequency with which the car computer communicates with the sensors varies, but it can be as frequent as once every 5 seconds, or as low as once every time the ignition is connected. The rest of the time, the sensors are in a "stand by" mode consuming very low battery power (same order of magnitude as a digital wrist watch). They only become "alive" when activated by a digital radio code sent from the car computer. 3) If the sensor detects that the pressure is signifcantly lower than the normal value it was calibrated for, it will send a "Not OK" signal back to the car computer, which will inform you via a warning light. The technology combines developments from things like radio frequency tags and wireless digital communication (Wifi, BlueTooth). The interesting part is that because it only activates the sensors from time to time, and the whole process takes miliseconds, the power consumption is very low and the batteries in the sensors last very long - typically as long as a set of tires, so the batteries have to be replaced only when a new set of tires is installed. Because specific sensors are designed to work with specific car computer, I don't think they will work on trailer tires. Maybe if your car is already equipped with low tire pressure alarm, your could try to install the same type/brand of sensors which are installed in the car's tires on the trailer. However, typically the car computer expects to "talk" with four sensors at the same time, so hearing back from six may confuse it (with upredictable results). Also, the transmission power may not be enough to cover the distance from the trailer wheels to the car computer. Where are the pressure sensing devices located? The wheels are sealed. On my 4Runner, they are part of the valves, and fit inside the tires. It cannot work that way on either my Buick LeSabre or Lucerne. There is nothing inside the wheel attached to the valve. There is nothing inside the tire/wheel except air! Now my curiosity is piqued. I have a LeSabre wheel in my garage, I'm going and cut the valve stem apart. |
#4
posted to rec.boats
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Tire pressure indicators
"Bishoop" wrote in message ... "Harry Krause" wrote in message ... Bishoop wrote: "katekebo" wrote in message oups.com... They are actually miniature pressure sensing devices and radio transmitters. They can sense (and report) a drop in the tire pressure vs. a pre-programmed setting. They "talk" with a radio transmitter-receiver in the car computer (somewhat similar to a wireless Internet connection -WiFi or BlueTooth). The way they work is as follows: 1) With tires pressure adjusted at the correct value, they get "calibrated" by the car computer. Basically, the car computer send a radio signal to the sensors mounted in the wheels to "learn" the pressure and keep it as reference for future measurements. The calibration is usually done by pressing a button on the car's dashboard for 5 seconds or so. 2) Once calibrated, and with the ignition ON, the car computer "asks" the tire pressure sensors to check the pressure and report back if it is OK. The frequency with which the car computer communicates with the sensors varies, but it can be as frequent as once every 5 seconds, or as low as once every time the ignition is connected. The rest of the time, the sensors are in a "stand by" mode consuming very low battery power (same order of magnitude as a digital wrist watch). They only become "alive" when activated by a digital radio code sent from the car computer. 3) If the sensor detects that the pressure is signifcantly lower than the normal value it was calibrated for, it will send a "Not OK" signal back to the car computer, which will inform you via a warning light. The technology combines developments from things like radio frequency tags and wireless digital communication (Wifi, BlueTooth). The interesting part is that because it only activates the sensors from time to time, and the whole process takes miliseconds, the power consumption is very low and the batteries in the sensors last very long - typically as long as a set of tires, so the batteries have to be replaced only when a new set of tires is installed. Because specific sensors are designed to work with specific car computer, I don't think they will work on trailer tires. Maybe if your car is already equipped with low tire pressure alarm, your could try to install the same type/brand of sensors which are installed in the car's tires on the trailer. However, typically the car computer expects to "talk" with four sensors at the same time, so hearing back from six may confuse it (with upredictable results). Also, the transmission power may not be enough to cover the distance from the trailer wheels to the car computer. Where are the pressure sensing devices located? The wheels are sealed. On my 4Runner, they are part of the valves, and fit inside the tires. It cannot work that way on either my Buick LeSabre or Lucerne. There is nothing inside the wheel attached to the valve. There is nothing inside the tire/wheel except air! Now my curiosity is piqued. I have a LeSabre wheel in my garage, I'm going and cut the valve stem apart. The answer is right he http://www.aa1car.com/library/tire_monitors.htm Two types of systems, direct as with the 4Runner, and indirect as with my Buicks. Whew....now I can sleep tonight. |
#5
posted to rec.boats
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Tire pressure indicators
On Thu, 30 Mar 2006 18:34:43 -0500, "Bishoop" wrote:
The answer is right he http://www.aa1car.com/library/tire_monitors.htm That was an education. :-) |
#6
posted to rec.boats
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Tire pressure indicators
Around 3/30/2006 3:08 PM, Bishoop wrote:
"Harry Krause" wrote in message ... Bishoop wrote: Where are the pressure sensing devices located? The wheels are sealed. On my 4Runner, they are part of the valves, and fit inside the tires. It cannot work that way on either my Buick LeSabre or Lucerne. There is nothing inside the wheel attached to the valve. There is nothing inside the tire/wheel except air! Yep. GM uses the RPM method. Each tire's RPMs are monitored by the computer using the ABS sensors, and if any one is off by 10% as compared to the other three, it sets off a warning light. -- ~/Garth - 1966 Glastron V-142 Skiflite: "Blue-Boat" "There is nothing - absolutely nothing - half so much worth doing as simply messing about in boats." -- Kenneth Grahame ~~ Ventis secundis, tene cursum ~~ |
#7
posted to rec.boats
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Tire pressure indicators
"Wayne.B" wrote in message ... On Thu, 30 Mar 2006 18:34:43 -0500, "Bishoop" wrote: The answer is right he http://www.aa1car.com/library/tire_monitors.htm That was an education. :-) Yep. I thought BMW was unique, but obviously many cars use the RPM method. My daughter just had to have all the valve stems replaced on her Chrysler Caravan. (the EggMobil) The alarms were telling her she had four flats. RCE |
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