Cylinder pressure-based spark advance control for SI engines

Citation
S. Park et al., Cylinder pressure-based spark advance control for SI engines, JSME I J B, 44(2), 2001, pp. 305-312
Citations number
11
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Mechanical Engineering
Journal title
JSME INTERNATIONAL JOURNAL SERIES B-FLUIDS AND THERMAL ENGINEERING
ISSN journal
1340-8054 → ACNP
Volume
44
Issue
2
Year of publication
2001
Pages
305 - 312
Database
ISI
SICI code
1340-8054(200105)44:2<305:CPSACF>2.0.ZU;2-J
Abstract
The introduction of inexpensive cylinder pressure sensors provides new oppo rtunities for precise engine control. This paper presents a spark advance c ontrol Strategy based upon cylinder pressure in spark ignition engines. It is well known that the location of peak pressure (LPP) reflects combustion phasing and can be used for controlling the spark advance. The well-known p roblems of the LPP-based spark advance control method are that many samples of data are required and there is loss of combustion phasing detection cap ability due to hook-back at late burn conditions. To solve these problems, a multi-layer feedforward neural network is employed. The LPP and hook-back are estimated, using the neural network, which needs only five output volt age samples from the pressure sensor. The neural network plays an important role in mitigating the A/D conversion load of an electronic engine control ler by increasing the sampling interval from 1 degrees crank angle(CA) to 2 0 degrees CA. A proposed control algorithm does not need a sensor calibrati on and pegging (bias calculation) procedure because the neural network esti mates the LPP from the raw sensor output voltage, The estimated LPP can be regarded as a good index for combustion phasing, and can also be used as an MBT control parameter. The feasibility of this methodology is closely exam ined through steady and transient engine operations to control individual c ylinder spark advances. The experimental results have revealed a favorable agreement of optimal combustion phasing in each cylinder.