Cylinder-Pressure-Based Engine Control Using Pressure- Ratio-Management and Low-Cost Non-Intrusive Cylinder Pressure Sensors

Document Number: 2000-01-0932

Date Published: March 2000

Author(s):
Mark C. Sellnau - Delphi R&D
Frederic A. Matekunas - General Motors R&D

Abstract:
Over the last two decades, advanced engine control systems have been developed that use cylinder pressure as the primary feedback variable. Production application has been limited by cost, reliability, and packaging difficulties associated with intrusive cylinder pressure sensors. Now, a low- cost, cylinder-pressure-based engine control system has been developed that utilizes Pressure-Ratio Management (PRM) and non-intrusive cylinder pressure sensors mounted in the spark plug boss of four-valve-per-cylinder engines. The system adaptively optimizes individual-cylinder spark timing and air-fuel ratio, and overall exhaust gas recirculation (EGR) for best fuel economy and lowest emissions over the life of each vehicle.

This paper presents the engine control and cylinder pressure sensor systems. Results are presented showing spark timing and EGR control, knock and misfire detection, cylinder-to-cylinder air/fuel balancing, and cold start control.

File Size: 1009K
Product Status: In Stock

See other papers presented at SAE 2000 World Congress, March 2000, Detroit, MI, USA, Session: Electronic Engine Controls (Part E&F)

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