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A New Electronic Engine Control System Using a Hot-Wire Air Flow Sensor
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English
Abstract
A hot-wire air flow sensor which can directly measure the intake air mass flow has been developed, and a microprocessor based engine control system using the sensor has been designed. The sensing probe of the sensor is formed from a small wire-wound resistor, and installed in the bypass of the intake passage. The sensor requires a good signal processing method under pulsating flow conditions because of its quick response. New control technologies were examined for the prototype engine control system, using the sensor, as applied to a 4 cycle, 4 cylinder engine. The air-to-fuel ratio, ignition timing, and EGR rate are controlled to their optimum values by a microprocessor which processes signals of this sensor and of other sensors indicating the engine operating conditions. The results of engine performance tests show that the output power, fuel economy and exhaust emissions are improved significantly in comparison with other fuel management systems.
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Authors
- Takao Sasayama - Hitachi Res. Lab., Hitachi, Ltd. Tokyo, Japan
- Takeshi Hirayama - Hitachi Res. Lab., Hitachi, Ltd. Tokyo, Japan
- Matsuo Amano - Hitachi Res. Lab., Hitachi, Ltd. Tokyo, Japan
- Shinichi Sakamoto - Hitachi Res. Lab., Hitachi, Ltd. Tokyo, Japan
- Masayuki Miki - Hitachi Res. Lab., Hitachi, Ltd. Tokyo, Japan
- Yutaka Nishimura - Hitachi Res. Lab., Hitachi, Ltd. Tokyo, Japan
- Sadayasu Ueno - Hitachi Res. Lab., Hitachi, Ltd. Tokyo, Japan
Citation
Sasayama, T., Hirayama, T., Amano, M., Sakamoto, S. et al., "A New Electronic Engine Control System Using a Hot-Wire Air Flow Sensor," SAE Technical Paper 820323, 1982, https://doi.org/10.4271/820323.Also In
References
- Japanese Patent Bulletin 35 14303 Sept. 1960
- Wahl V.J. “Ein Gerät zur schnellen Messung der Luftzahl bei Motoren mit elektronisch gesteuerter Kraftstoff-einspritzung” Bosch Tech. Berichte 5 1 19 23 1975
- Sasayama T. Hirayama T. Suda S. “A Concept of Input/Output Signal Processing for Microprocessor Engine Control Systems” SAE Paper 800125
- Nishimura Y. Ohyama Y. Kuroiwa H. Sasayama T. Ueno S. Ohtani T. “Hot-Wire Air Flow Meter for Engine Control System” ISATA '81 Proceedings Sept. 7 - 11 1981