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1. IN3224/CHENP/2011 - STOP CONTROL SYSTEM FOR INTERNAL COMBUSTION ENGINE

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[ EN ]
CLAIMS [Claim 1] A stop control system for an internal combustion engine, including stopmeans for stopping at least one of the ignition and the fuel injection of said engine based on a stop command, an intake air flow rate control valve for controlling an intake air flow rate of said engine, stop position control means for controlling a stop position of a piston of said engine by actuating said intake air flow rate control valve, and rotational angle detecting means for detecting a rotational angle of a crankshaft of said engine, and rotational speed detecting means for detecting a rotational speed of the said engine, said stop control system being characterized in that, said stop position control means determines an valve opening amount of said intake air flow rate control valve using the engine rotational speed detected by said rotational speed detecting means and the rotational angle detected by said rotational angle detecting means, after the operation of said stop means, and actuates said intake air flow rate control valve so that the valve opening amount of said intake air flow rate control valve coincides with the determined valve opening amount, thereby increasing the intake air flow rate.[Claim 2] A stop control system according to claim 1, wherein said stop positioncontrol means determines the valve opening amount of said intake air flow rate control valve based on the detected rotational angle at the time when the detected engine rotational speed becomes equal to or lower than a predetermined rotational speed.[Claim 3] A stop control system according to claim 1, wherein said stop positioncontrol means determines the valve opening amount of said intake air flow rate control valve based on the detected engine rotational speed at the time when the detected rotational angle reaches a predetermined rotational angle.[Claim 4] A stop control system according to claim 1, wherein said stop positioncontrol means retrieves a map on which the valve opening amount of said intake air flow rate control valve is set according to the engine rotational speed and the rotational angle, to determine the valve opening amount when the detected engine rotational speed is within a predetermined range.[Claim 5] A stop control system according to any one of claims 1 to 4, wherein thevalve opening amount of said intake air flow rate control valve is maintained at thedetermined valve opening amount until the engine rotational speed reaches "0".[Claim 6] A stop control system according to any one of claims 1 to 5, wherein saidintake air flow rate control valve is opened before the start timing of the last intake stroke of a cylinder before the engine stoppage, said cylinder being estimated to be in the compression stroke at the time of the engine stoppage.[Claim 7] A stop control system according to any one claims 1 to 5, wherein saidintake air flow rate control valve is opened before the start timing of the last intake stroke of a cylinder before the engine stoppage, said cylinder being estimated to be in the expansion stroke at the time of the engine stoppage.[Claim 8] A stop control method for an internal combustion engine for controlling astop position of a piston of said engine by actuating an intake air flow rate control valve for controlling an intake air flow rate of said engine, when stopping said engine by stopping at least one of the ignition and the fuel injection of said engine based on a stop command, said stop control method being characterized by comprising the steps of:a) detecting a rotational angle of a crankshaft of said engine and a rotational speed of said engine;b) determining an valve opening amount of said intake air flow rate control valve using the detected engine rotational speed and the detected rotational angle after at least one of the ignition and the fuel injection of said engine is stopped; andc) actuating said intake air flow rate control valve so that the valve opening amount of said intake air flow rate control valve coincides with the determined valve opening amount, thereby increasing the intake air flow rate.[Claim 9] A stop control method according to claim 8, wherein the valve openingamount of said intake air flow rate control valve is determined in said step c) based on the detected rotational angle at the time when the detected engine rotational speed becomes equal to or lower than a predetermined rotational speed.[Claim 10] A stop control method according to claim 8, wherein the valve openingamount of said intake air flow rate control valve is determined in said step c) based on the detected engine rotational speed at the time when the detected rotational angle reaches a predetermined rotational angle.[Claim 11] A stop control method according to claim 8, wherein the valve openingamount is determined in said step c) by retrieving a map on which the valve opening amount of said intake air flow rate control valve is set according to the engine rotational speed and the rotational angle when the detected engine rotational speed is within a predetermined range.[Claim 12] A stop control method according to any one of claims 8 to 11, whereinthe valve opening amount of said intake air flow rate control valve is maintained at thedetermined valve opening amount until the engine rotational speed reaches "0".[Claim 13] A stop control method according to any one of claims 8 to 12, whereinsaid intake air flow rate control valve is opened before the start timing of the last intakestroke of a cylinder before the engine stoppage, said cylinder being estimated to be in thecompression stroke at the time of the engine stoppage.[Claim 14] A stop control method according to any one of claims 8 to 12, whereinsaid intake air flow rate control valve is opened before the start timing of the last intakestroke of a cylinder before the engine stoppage, said cylinder being estimated to be in theexpansion stroke at the time of the engine stoppage.