JP2005282434A5 - - Google Patents

Claims (9)

When the preset automatic engine stop condition is satisfied, the fuel supply for continuing the engine operation is stopped to automatically stop the engine, and the restart condition for the engine in the automatic stop state is satisfied. A four-cycle multi-cylinder engine starter configured to combust a cylinder in a stopped state at least in an expansion stroke and restart the engine,
An intake flow rate adjusting means for adjusting the intake flow rate taken into the cylinder of the engine;
An alternator driven by an engine;
In the initial stage of the automatic engine stop operation, the intake air flow rate adjusted by the intake air flow rate adjusting means is set to a predetermined amount higher than the minimum intake air flow rate required for continuing the engine operation, and the power generation amount of the alternator Is set lower than before the engine automatic stop condition is satisfied and the scavenging mode period for scavenging the combustion gas in the cylinder is set, and then when the engine speed decreases to a preset reference speed, the intake air An engine starter characterized by comprising an automatic stop control means for reducing the flow rate and controlling so as to increase the power generation amount of the alternator after a predetermined period has elapsed since the power generation amount of the alternator was decreased. . When the engine is automatically stopped, the engine rotation speed is detected after a certain period from the time when the engine rotation speed has decreased to a preset reference speed. 2. The engine starting device according to claim 1, wherein the power generation amount of the alternator is set to a smaller value than that of the alternator.   When the engine is automatically stopped, the power generation amount of the alternator is controlled to a preset constant value when the engine speed drops to a preset reference speed, and after that a predetermined time elapses. 2. The engine starter according to claim 1, wherein the engine rotation speed is detected, and when the rotation speed is high, the power generation amount of the alternator is set to a larger value than when the rotation speed is low.   The engine speed when the piston passes through the compression top dead center is detected when the engine is automatically stopped, and the power generation amount of the alternator is controlled based on the detected value of the rotation speed. Or an engine starting device according to 3;   When the engine is automatically stopped, a decrease degree of the engine rotation speed is detected when a predetermined time has elapsed after the engine rotation speed has decreased to a preset reference speed, and the engine is detected based on the detected value of the decrease degree. The engine start according to any one of claims 2 to 4, wherein when the rotational speed of the engine is confirmed to be significantly reduced, the power generation amount of the alternator is temporarily increased. apparatus.   6. The engine speed at which fuel injection is stopped when the engine is automatically stopped is set to a value higher than a normal idle speed at which the engine is not automatically stopped. The engine starter according to claim 1.   The engine starter according to any one of claims 1 to 6, wherein when the engine is automatically stopped, the power generation amount of the alternator is temporarily set to 0 when fuel injection is stopped.   When the engine automatic stop condition is satisfied, the target engine speed is set to a value higher than the normal idle speed at which the engine is not automatically stopped, and the intake flow rate adjusting means is set so that the intake pressure becomes a constant value. The engine starter according to any one of claims 1 to 7, wherein the fuel injection is stopped in a state where the intake pressure is stabilized by the control.   The engine starting device according to any one of claims 1 to 8, wherein the automatic transmission is set to a neutral state when an automatic engine stop condition is satisfied.