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tire pressure monitoring system
Tire Pressure Monitoring System
Tire Pressure Monitoring System (TPM or TPMS) is a warning system to monitor tire pressure and indicate to the driver when a tire is significantly underinflated so as to prevent unsafe conditions. There are two ways to get information about the tire pressure, implemented by wheel-speed based systems or pressure-sensor based systems. The former infers tire pressure by monitoring wheel speed from ABS wheel-speed sensor, which cant work when more than one tire is underinflated or when vehicle speed is over 100 km/h. The latter can directly measure tire pressure with an imbedded electronic device, a pressure sensor powered by Li/SOCl2, sending signals via RF transmitter to the indicator in drivers cabin, which is quicker to provide underinflation, leaking, hazardous hi-pressure or hi-temperature warnings, and has more consistent warning thresholds. Both TPM sensors must be adjusted after mounting.
The TPM system consists of the following major components
1. Remote Tire Pressure Monitoring (RTPM)
(1) SOC detecting pressure, temperature, acceleration, voltage, signal process ASIC
(2) MCU 4-8 bits: ARM7 LPC2292
(3) RF transmitter: GE NPXII Sensor Chips
(4) Power management: Li/SO battery
(6) Pressure vessel
2. LCD Indicator (Information centre)
>Case material: Hi-strength ABS
>RF receiver: 4 or 8 tires pressure monitoring
>Battery life: 2 years or 100,000 miles.
>LCD Indicator: integrated with automobile information center
>Outside dimensions of TPM sensor, it is sensing range, and indicator can be customized made.
>>Compensates for battery conditions and alarm when battery is used up
>>Supports vehicle platforms ranging from 4 tires small cars to 8 tires trucks and across tire technologies
>>Monitors individual tires, detecting changes in pressure and performance
>>Offers the possibility to couple with a remote keyless entry system for a low-cost total solution
>>Offers the small size and enhanced media protection of the SSOP package