Design of a real-time tyre pressure monitoring system for LMVs
The tyre pressure is not adequately maintained by the majority of automobile drivers, even though they drop more than one pounds per square inch (PSI) of air pressure a month. The National Highway Traffic Safety Administration (NHTSA) statistics show that low-tyre pressure-related crashes cause 660 fatalities and 33,000 injuries every year. At present, the tyre pressure is monitor from differences in the rotational speed and deduces the pressure differences between tyres. The anti-lock braking system (ABS) sensors can be used to measure it. The proposed system employs advanced integration techniques to provide a TPMS solution that provides real-time tyre pressure monitoring (both stationary and movement condition of the vehicle) and alerts the driver about improperly inflated tyres. The unit includes a pressure sensor, microcontroller, RF transmitter and long life battery. The TPMS unit communicates by an on- board RF receiver and displays real-time tyre pressure of all tyres. Tyre pressure is monitored in the stationary condition of the vehicle at present. This project can be extended to read pressure values in the moving condition of vehicle and generate the alert signal to the driver when the threshold value is reached. The entire design is envisaged to be developed as a small and compact unit that can be easily fitted onto a tyre.
Research on Bicycle Built-in Pump Device Based on ADAMS
In order to solve the problem that the pump is not convenient to carry during the bicycle trip, a bicycle builtin pump device is introduced in this paper. The motion analysis and simulation of this device are implemented based on ADMAS. Moreover, an air valve adjusting valve is installed near the air tap of the rear-wheel to monitor the tire pressure. When the tire pressure is higher than the set pressure of the air valve, the air will be automatically released, which can ensure the safety of the tire. In the experiment, this built-in pump device needs 130 s to pump a tire (24×1.25-510 mm) from 100 kPa to 200 kPa.
Compact switched and reconfigurable 4-ports beam antenna array for MIMO applications
In this paper, we analyze and introduce a practical design for a switched beam planar antenna that can be implemented as a compact and low cost switched and/or reconfigurable beam antenna array. The antenna is composed of a four ports antenna array based on arranged eight L-shaped quarter-wavelength slot antenna elements. This type of antenna array is a planar structure and its maximum directional radiation beam pattern presents in azimuth plane with the covering of 360 degree. The operation of antenna array is based on the statuses of ON/OFF stage of PIN diodes in each individual slot antenna element and the combined signals from four ports. Consequently, by proper controlling the stage of PIN diodes, the antenna can exposes its characteristic of switchable and/or reconfigurable beam patterns in φ-plane. The antenna array size is about 56 mm in square with four ports. To prove the concept, a 2.5–2.8 GHz switched-beam antenna for WLAN applications in MIMO is simulated and fabricated.