Toyota and Denso have jointly developed a compact electronically controlled common rail system named 'ECD-U2P' for diesel engine of passenger cars. The developed common rail system has the following features: 1. Injector: Clearance leakage at the seat of a 2-way solenoid valve is greatly reduced by adapting the flat seat. Additionally, annular protrusion with narrow width reduces force up to 1/4 due to pressurized fuel, resulting in a decrease of injector solenoid size. Durability is greatly improved for outside of annular groove with drain groove absorbing a large part of the impact force. 2. Pump: Pump driving torque is reduced by means of the metering delivery system in comparison with full delivery system. Furthermore, the metering delivery pump improves fuel consumption by 2 % with EC cycle and restrains increase of fuel temperature without relief of high-pressure fuel. The pump installed with two pairs of plungers in tandem greatly reduces the effective tensile force of belt due to reduction of fluctuation of pump driving torque. As a result, this pump is capable of being mounted on engines with belt pump drive without significantly redesigning the belt layout. 3. Leakage monitoring system: Synchronous delivery with injection in an optimized phase enables to develop a leakage monitoring system capable of precise and quick detection, and thus, identifying failed components. 4. Abnormal combustion proof: A number of abnormal combustion pressure generations is contained within due to leakage monitoring system and the corresponding cylinder pressure is 22 MPa on the test engine at the most. Accordingly, designing buckling strength of connecting rod to exceed 25 MPa prevents damage to engine. 5. Improvement of pressure decreasing characteristics: By activating a solenoid valve in a certain period that enables to begin injection, speed of decreasing pressure in the deceleration can be improved due to high-pressure fuel flow via outlet orifice into the tank. Accordingly, combustion noise after acceleration due to a higher pressure injection than target pressure is improved without extra components.


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    Title :

    Development of a common rail system for a HSDI diesel engine


    Additional title:

    Entwicklung eines Common-Rail-System für einen direkteinspritzenden Pkw-Dieselmotor


    Contributors:
    Hokazono, Y. (author) / Konomi, T. (author) / Fujimura, T. (author) / Miyata, Y. (author)


    Publication date :

    1999


    Size :

    11 Seiten, 8 Bilder, 4 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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