In this paper, a novel MEMS accelerometer based fuel control system for automobile applications has been presented, primarily to be used in Engine Control Unit (ECU). It consists of a MEMS accelerometer inertial sensor for acceleration/velocity measurement of automobile followed by a dedicated signal conditioning unit, data converter and fuel control unit. MEMS accelerometer implemented in this work is an application specific low-g single axis piezoresistive bulk micromachined device with very low cross-axis sensitivity, and fabricated using post-process CMOS compatible dual-dope (Silicic acid +Ammonium per Sulphate) TMAH anisotropic etching. Signal conditioning circuit is a chopper stabilized (CS) low noise amplifier suitable for low frequency low amplitude signal amplification. Data converter is a low power, 6-bit successive approximation (SAR) ADC. Circuit is designed in 0.18 µm CMOS technology. PID based control unit, which regulates the duration of fuel injection depending on the driver's request in real time for optimal efficiency and minimal pollution, has been developed in Simulink module.

Date Published: 30 December 2008
PDF: 11 pages
Proc. SPIE 7268, Smart Structures, Devices, and Systems IV, 72680Q (30 December 2008); doi: 10.1117/12.810989

Published in SPIE Proceedings Vol. 7268:
Smart Structures, Devices, and Systems IV
Said Fares Al-Sarawi; Vijay K. Varadan; Neil Weste; Kourosh Kalantar-Zadeh, Editor(s)