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1. EP2345807 - INTERNAL COMBUSTION ENGINE STOP CONTROL DEVICE

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

Claims

1. A stop control system for an internal combustion engine (1), including stop means for stopping at least one of the ignition and the fuel injection of said engine (1) based on a stop command, an intake air flow rate control valve (3) 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 (3), and rotational angle detecting means (8) for detecting a rotational angle (CA) of a crankshaft of said engine, and rotational speed detecting means (8) for detecting a rotational speed (NE) of the said engine,
wherein said stop position control means determines an valve opening amount (THCMD) of said intake air flow rate control valve (3) using the engine rotational speed (NE) detected by said rotational speed detecting means (8) and the rotational angle (CA) detected by said rotational angle detecting means (8), after the operation of said stop means, and actuates said intake air flow rate control valve (3) so that the valve opening amount (THCMD) of said intake air flow rate control valve (3) coincides with the determined valve opening amount (THCMD), thereby increasing the intake air flow rate,
characterized in that
a cylinder of the engine includes an overlapped state where both of the intake valve and the exhaust valve are opened,
wherein said stop position control means determines the valve opening amount (THCMD) of said intake air flow rate control valve (3) based on the detected rotational angle (CA) at the time when the detected engine rotational speed (NE) is within a predetermined OK range in which engine stoppage in the overlapped range of the intake and exhaust valves is avoided.
  2. A stop control system for an internal combustion engine (1), including stop means for stopping at least one of the ignition and the fuel injection of said engine (1) based on a stop command, an intake air flow rate control valve (3) 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 (3), and rotational angle detecting means (8) for detecting a rotational angle (CA) of a crankshaft of said engine, and rotational speed detecting means (8) for detecting a rotational speed (NE) of the said engine,
wherein said stop position control means determines an valve opening amount (THCMD) of said intake air flow rate control valve (3) using the engine rotational speed (NE) detected by said rotational speed detecting means (8) and the rotational angle (CA) detected by said rotational angle detecting means (8), after the operation of said stop means, and actuates said intake air flow rate control valve (3) so that the valve opening amount (THCMD) of said intake air flow rate control valve (3) coincides with the determined valve opening amount (THCMD), thereby increasing the intake air flow rate,
characterized in that
a cylinder of the engine includes an overlapped state where both of the intake valve and the exhaust valve are opened,
wherein said stop position control means determines the valve opening amount (THCMD) of said intake air flow rate control valve (3) based on the detected engine rotational speed (NE) at the time when the detected rotational angle (CA) reaches a predetermined rotational angle (CA0), and the detected engine rotational speed NE is within a predetermined OK range in which engine stoppage in the overlapped range of the intake and exhaust valves is avoided.
  3. A stop control system for an internal combustion engine (1), including stop means for stopping at least one of the ignition and the fuel injection of said engine (1) based on a stop command, an intake air flow rate control valve (3) 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 (3), and rotational angle detecting means (8) for detecting a rotational angle (CA) of a crankshaft of said engine, and rotational speed detecting means (8) for detecting a rotational speed (NE) of the said engine,
wherein said stop position control means determines an valve opening amount (THCMD) of said intake air flow rate control valve (3) using the engine rotational speed (NE) detected by said rotational speed detecting means (8) and the rotational angle (CA) detected by said rotational angle detecting means (8), after the operation of said stop means, and actuates said intake air flow rate control valve (3) so that the valve opening amount (THCMD) of said intake air flow rate control valve (3) coincides with the determined valve opening amount (THCMD), thereby increasing the intake air flow rate,
characterized in that
a cylinder of the engine includes an overlapped state where both of the intake valve and the exhaust valve are opened,
wherein said stop position control means retrieves a map on which the valve opening amount (THCMD) of said intake air flow rate control valve (3) is set according to the engine rotational speed (NE) and the rotational angle (CA), to determine the valve opening amount (THCMD) when the detected engine rotational speed (NE) is within a predetermined OK range in which engine stoppage in the overlapped range of the intake and exhaust valves is avoided.
  4. A stop control system according to any one of claims 1 to 3, wherein the valve opening amount (THCMD) of said intake air flow rate control valve (3) is maintained at the determined valve opening amount until the engine rotational speed (NE) reaches "0".
  5. A stop control system according to any one of claims 1 to 4, wherein said intake air flow rate control valve (3) is opened before the start timing (CAIS2) 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.
  6. A stop control system according to any one claims 1 to 4, wherein said intake air flow rate control valve (3) is opened before the start timing (CAIS1) 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.
  7. A stop control method for an internal combustion engine (1) for controlling a stop position of a piston of said engine by actuating an intake air flow rate control valve (3) for controlling an intake air flow rate of said engine (1), when stopping said engine (1) by stopping at least one of the ignition and the fuel injection of said engine based on a stop command, said stop control method comprising the steps of:

a) detecting a rotational angle (CA) of a crankshaft of said engine and a rotational speed (NE) of said engine;

b) determining an valve opening amount (THCMD) of said intake air flow rate control valve (3) using the detected engine rotational speed (NE) and the detected rotational angle (CA) after at least one of the ignition and the fuel injection of said engine is stopped; and

c) actuating said intake air flow rate control valve (3) so that the valve opening amount (THCMD) of said intake air flow rate control valve coincides with the determined valve (3) opening amount (THCMD), thereby increasing the intake air flow rate,

characterized in that
a cylinder of the engine includes an overlapped state where both of the intake valve and the exhaust valve are opened,
wherein the valve opening amount (THCMD) of said intake air flow rate control valve (3) is determined in said step c) based on the detected rotational angle (CA) at the time when the detected engine (NE) rotational speed is within a predetermined OK range in which engine stoppage in the overlapped range of the intake and exhaust valves is avoided.
  8. A stop control method for an internal combustion engine (1) for controlling a stop position of a piston of said engine by actuating an intake air flow rate control valve (3) for controlling an intake air flow rate of said engine (1), when stopping said engine (1) by stopping at least one of the ignition and the fuel injection of said engine based on a stop command, said stop control method comprising the steps of:

a) detecting a rotational angle (CA) of a crankshaft of said engine and a rotational speed (NE) of said engine;

b) determining an valve opening amount (THCMD) of said intake air flow rate control valve (3) using the detected engine rotational speed (NE) and the detected rotational angle (CA) after at least one of the ignition and the fuel injection of said engine is stopped; and

c) actuating said intake air flow rate control valve (3) so that the valve opening amount (THCMD) of said intake air flow rate control valve coincides with the determined valve (3) opening amount (THCMD), thereby increasing the intake air flow rate,

characterized in that
a cylinder of the engine includes an overlapped state where both of the intake valve and the exhaust valve are opened,
wherein the valve opening amount (THCMD) of said intake air flow rate control valve (3) is determined in said step c) based on the detected engine rotational speed (NE) at the time when the detected rotational angle (CA) reaches a predetermined rotational angle (AO), and the detected engine rotational speed (NE) is within a predetermined OK range in which engine stoppage in the overlapped range of the intake and exhaust valves is avoided.
  9. A stop control method for an internal combustion engine (1) for controlling a stop position of a piston of said engine by actuating an intake air flow rate control valve (3) for controlling an intake air flow rate of said engine (1), when stopping said engine (1) by stopping at least one of the ignition and the fuel injection of said engine based on a stop command, said stop control method comprising the steps of:

a) detecting a rotational angle (CA) of a crankshaft of said engine and a rotational speed (NE) of said engine;

b) determining an valve opening amount (THCMD) of said intake air flow rate control valve (3) using the detected engine rotational speed (NE) and the detected rotational angle (CA) after at least one of the ignition and the fuel injection of said engine is stopped; and

c) actuating said intake air flow rate control valve (3) so that the valve opening amount (THCMD) of said intake air flow rate control valve coincides with the determined valve (3) opening amount (THCMD), thereby increasing the intake air flow rate,

characterized in that
a cylinder of the engine includes an overlapped state where both of the intake valve and the exhaust valve are opened,
wherein the valve opening amount (THCMD) is determined in said step c) by retrieving a map on which the valve opening amount (THCMD) of said intake air flow rate control valve (3) is set according to the engine rotational speed (NE) and the rotational angle (CA) when the detected engine rotational speed (NE) is within a predetermined OK range in which engine stoppage in the overlapped range of the intake and exhaust valves is avoided.
  10. A stop control method according to any one of claims 7 to 9, wherein the valve opening amount (THCMD) of said intake air flow rate control valve (3) is maintained at the determined valve opening amount until the engine rotational speed reaches "0".
  11. A stop control method according to any one of claims 7 to 10, wherein said intake air flow rate control valve (3) is opened before the start timing (CAIS2) 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.
  12. A stop control method according to any one of claims 7 to 10, wherein said intake air flow rate control valve (3) is opened before the start timing (CAIS1) 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.