Tire Pressure Warning System
Published January 01, 1985 by National Highway Traffic Safety Administration in United States
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Low tire pressure can have adverse effects on a vehicle, such as abnormal tire wear, increased tire rolling loss, tire burst due to excessive heat generated, poor running stability due to reduced cornering power, and hydroplaning phenomenon.
The purpose of a low tire pressure warning device is to give adequate warning to a driver when tire pressure falls below the specified level, calling attention to the need for countermeasures, such as adding tire pressure or tire repairs. Thus, the equipment is to reduce the adverse effects of low tire pressure, insure safer operation, and achieve better economy.
For this, various warning devices have been developed and reported. The tire pressure warning system presented in this paper was developed to incorporate a user-friendly feature that would tell the driver which of the four wheels has low tire pressure, combined with low system price.
To achieve these targets, a combination of magnet and Hall effect IC was selected for transmitting change in tire pressure from a rotating and vibrating tire, which also resulted in a simple control circuit.
The main components of the system are a pressure sensor using a magnet. Hall effect IC, control circuit, and alarm section, operating as follows:
- A pressure sensor is mounted on each wheel disc. When pressure falls, the magnet of the pressure sensor, as it rotates, causes a change in the magnetic field it generates.
- Each time the wheel rotates, the magnet moves across the Hall effect IC mounted on a suspension member. The IC then detects the change in the magnetic field and signals the control circuit.
- The control circuit identifies the wheel generating the signal, then operates the alarm to warn the driver.
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- Yuji Uemura - Subaru Engineering Division, Fuju Heavy Industries, Ltd.
- Saiichirou Oshita - Subaru Engineering Division, Fuju Heavy Industries, Ltd.
- Toshihiro Konno - Subaru Engineering Division, Fuju Heavy Industries, Ltd.
- Toshiyuki Kobuna - Subaru Engineering Division, Fuju Heavy Industries, Ltd.
- Yoshihiro Yoshida - Subaru Engineering Division, Fuju Heavy Industries, Ltd.
CitationUemura, Y., Oshita, S., Konno, T., Kobuna, T. et al., "Tire Pressure Warning System," SAE Technical Paper 856044, 1985.
- Nishimura. Hiroaki, “Trend of tire pressure warning devices,” Journal of the Society of Automotive Engineer of Japan (in Japanese), Vol.38, No, 11, 1984.
- Takahashi, Michiyoshi, and Matsushita Yoshihiro, “Current and future states of tire development,” Journal of the Society of Automotive Engineer of Japan (in Japanese), Vol.39, No.1, 1985.
- · Nishimura. Hiroaki, “The development of two simple tire warning devices,” SAE Paper 840067, 1984. · Wazawa, Kiyoshi, and Hosaka Akio, “Development of the Nissan Alarm System of Tire Abnormal Condition (NASTAC),” Nissan Gijutsu (in Japanese), No.8, January 1973. · “Tire pressure digital display unit,” Nikkei Mechanical (in Japanese), 1.2, p.28, 1984. · Kurshige, Tomoyoshi, Kobane Sumio. Takahashi Hiroshi, and Komatsu Satoru, “Low Tire Pressure Warning Device (LTPWD),” SAE Paper 820458, 1982.