US 8,554,451 B2 · Stop control system for internal combustion engine

Abstract

A stop control system for an internal combustion engine, which controls a stop position of a piston of the engine, is provided. An valve opening amount of an intake air flow rate control valve is determined based on the detected engine rotational speed and the detected crank angle after the ignition switch is turned off, and the intake air flow rate control valve is controlled so that the valve opening amount of the intake air flow rate control valve coincides with the determined valve opening amount. For example, the valve opening amount of the intake air flow rate control valve is determined according to the crank angle at the time the engine rotational speed decreases to reach a predetermined range, and the intake air flow rate control valve is controlled to be opened. With this control, the intake air amount of the engine is increased so that the stop position of the piston coincides with the desired position.

Claims14

Dependent claims

A stop control system for an internal combustion engine, including stop means 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 a 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.

A stop control method for an internal combustion engine for controlling a stop 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;
and
c) 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.

1 more element

Dependencies are inferred from the claim text.

Stop control system for internal combustion engine

Life of this patent

Stop control system for internal combustion engine

Life of this patent

Abstract

Claims14