Control System Development for Gasoline HCCI Engine Which Based on Heat Management
Homogenous Charge Compression Ignition (HCCI) technology shows a great fuel economy potential for gasoline engine. In the project, a 4-cylinder 1.5 L PFI gasoline engine with HCCI and SI combustion mode was developed based on optimized heat management. Th
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Abstract Homogenous Charge Compression Ignition (HCCI) technology shows a great fuel economy potential for gasoline engine. In the project, a 4-cylinder 1.5 L PFI gasoline engine with HCCI and SI combustion mode was developed based on optimized heat management. The exhaust gas energy and coolant energy are used for heating intake air to suitable temperature as soon as possible. The exhaust turbocharger and EGR are used to expand HCCI operating range. Also cylinder pressure sensors are used for combustion feedback control and cylinder balance control. For this HCCI prototype engine, an innovative control system was developed for this complicated system. Control System has two ECUs, one ECU is for cylinder pressure sensor processing, which calculate combustion character values in real time and send to main ECU by CAN bus; another ECU is main ECU, which control injection system, ignition system, heat management system, etc. The control algorithm for mode transition between HCCI and SI was developed. Cylinder balanced algorithm base on CA50 was also developed to optimize emission and engine performance. By the optimized heat management system and control system algorithm, the HCCI engine can get 20 % fuel economy benefit in HCCI mode in part load, and also reach a wider operating range by the combination of turbocharger and EGR technology.
Keywords HCCI engine Engine heat management Mode transition Cylinder balance
HCCI control algorithm
F2012-A01-019 J. Zhang (&) Z. Huang Shanghai Jiaotong University, Shanghai, China e-mail: [email protected] Q. Yin Y. Shen L. Chen S. Lv SAIC Motor Technical Center, Shanghai, China
SAE-China and FISITA (eds.), Proceedings of the FISITA 2012 World Automotive Congress, Lecture Notes in Electrical Engineering 189, DOI: 10.1007/978-3-642-33841-0_7, Ó Springer-Verlag Berlin Heidelberg 2013
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1 Introduction Homogenous Charge Compression Ignition (HCCI) technology shows very high potential for better fuel consumption and lower emissions. The principle of HCCI combustion is auto ignition of a very lean and homogenous air/fuel mixture. The key point to realize HCCI combustion is that mixture temperature should reach the auto ignition temperature at certain time in cylinder. Many techniques have been used to realize HCCI mode, such as negative valve overlap [1], variable compression ratio [2], intake air heating [3], dual fuel combustion [4], etc. Besides engine system change, the control system of HCCI engine also meets a great challenge. Cylinder pressure sensor should be used for combustion state feedback and auto ignition control. The control system should also realize smooth mode transition between SI and HCCI mode. The research work relates to use heat management to achieve auto ignition temperature for HCCI combustion. The control system realized cylinder pressure based feedback control for multiple cylinder balance and engine torque control. Two ECU prototypes are used for HCCI engine, the main ECU does engine control mainly, and ano
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