초록 ▼

In an automatic stop device that automatically stops the operation of an internal combustion engine after a predetermined automatic stop condition is satisfied, a load acting on the engine is removed when the automatic stop condition is satisfied. When the automatic stop condition is satisfied, the

In an automatic stop device that automatically stops the operation of an internal combustion engine after a predetermined automatic stop condition is satisfied, a load acting on the engine is removed when the automatic stop condition is satisfied. When the automatic stop condition is satisfied, the between the magnitude of the load on the internal combustion engine before and after of the automatic stop condition is satisfied is determined, and an ignition timing retard amount of an ignition plug is decided such that the retard amount is increased as the difference becomes greater. The ignition timing is retarded by the retard amount substantially at the same moment as the load removing operation before the automatic stop control is initiated.

대표청구항 ▼

What is claimed is: 1. An automatic stop device for an internal combustion engine that executes an automatic internal combustion engine stop control to stop the operation of the internal combustion engine after a predetermined automatic stop condition is satisfied, comprising: a load control unit t

What is claimed is: 1. An automatic stop device for an internal combustion engine that executes an automatic internal combustion engine stop control to stop the operation of the internal combustion engine after a predetermined automatic stop condition is satisfied, comprising: a load control unit that removes a load on the internal combustion engine or reduces the load to a predetermined level when the automatic stop condition is satisfied; a load recognition unit that recognizes a magnitude of the load acting on the internal combustion engine before the load is removed or reduced by the load control unit; and an ignition timing control unit, upon the satisfaction of the automatic stop condition, that calculates a difference between the magnitude of the load on the internal combustion engine before and after the automatic stop condition is satisfied in accordance with the magnitude of the load on the internal combustion engine, selects an ignition timing retard amount of an ignition plug such that the retard amount is increased the greater the difference between the magnitude of the load before and after the automatic stop condition is satisfied, and retards the ignition timing of the ignition plug by the retard amount at substantially the same moment as the load removing operation or the load reducing operation is executed by the load control unit, before the automatic stop control is initiated. 2. The automatic stop device according to claim 1, further comprising a throttle control unit that reduces an intake air quantity by decreasing an opening degree of a throttle valve at the same time as the ignition timing control unit starts retarding the ignition timing of the ignition plug. 3. The automatic stop device according to claim 1, wherein the internal combustion engine is installed in a motor vehicle that performs an idling stop control to automatically stop the internal combustion engine when an idling stop condition is satisfied during stoppage of the motor vehicle. 4. An internal combustion engine for a vehicle, comprising: an automatic stop device for an internal combustion engine that executes an automatic internal combustion engine stop control to stop the operation of the internal combustion engine after a predetermined automatic stop condition is satisfied, comprising: a load control unit that removes a load on the internal combustion engine or reduces the load to a predetermined level when the automatic stop condition is satisfied; a load recognition unit that recognizes a magnitude of the load acting on the internal combustion engine before the load is removed or reduced by the load control unit; and an ignition timing control unit, upon the satisfaction of the automatic stop condition, that calculates a difference between the magnitude of the load on the internal combustion engine before and after the automatic stop condition is satisfied in accordance with the magnitude of the load on the internal combustion engine, selects an ignition timing retard amount of an ignition plug such that the retard amount is increased the greater the difference between the magnitude of the load before and after the automatic stop condition is satisfied, and retards the ignition timing of the ignition plug by the retard amount at substantially the same moment as the load removing operation or the load reducing operation is executed by the load control unit, before the automatic stop control is initiated, wherein, when an internal combustion engine restart condition is satisfied after the internal combustion engine is stopped by the automatic stop device, fuel is supplied to an initial combustion target cylinder in an intake stroke in the stop condition and the ignition operation of the ignition plug is started when the cylinder performs an expansion stroke. 5. An automatic stop device that stops an internal combustion engine by stopping an ignition operation of an ignition plug and by cutting off a fuel supply after a predetermined automatic stop condition is satisfied, comprising: a load control unit that removes a load on the internal combustion engine when the automatic stop condition is satisfied; a load recognition unit that recognizes a magnitude of the load acting on the internal combustion engine before the load is removed by the load control unit; an ignition timing control unit, upon the satisfaction of the automatic stop condition, that selects an ignition timing retard amount of the ignition plug such that the retard amount is increased the greater the magnitude of the load on the internal combustion engine, recognized by the load recognition unit, before the satisfaction of automatic stop condition is satisfied, and retards the ignition timing of the ignition plug by the retard amount at substantially the same moment the load removing operation is executed by the load control unit; and an automatic stop unit that stops the internal combustion engine by stopping the ignition operation of the ignition plug and by cutting off the fuel supply when a speed of the internal combustion engine reaches a predetermined automatic stop operation triggering speed through the retarding of the ignition timing of the ignition plug by the ignition timing control unit. 6. The automatic stop device according to claim 5, wherein the automatic stop unit first stops the ignition operation of the ignition plug and then cuts off the fuel supply when the speed of the internal combustion engine reaches the predetermined automatic stop operation triggering speed through the retarding operation of the ignition timing of the ignition plug by the ignition timing control unit. 7. The automatic stop device according to claim 5, wherein the internal combustion engine is a multi-cylinder internal combustion engine, and wherein the automatic stop unit stops the ignition operation of the ignition plug and cut off the fuel supply such that, when the internal combustion engine is stopped, a piston in a cylinder in an intake stroke is stopped near a top dead center. 8. The automatic stop device according to claim 5, wherein the automatic stop unit stops the ignition operation of the ignition plug and cuts off the fuel supply when a speed of the internal combustion engine detected at predetermined intervals reaches the predetermined automatic stop operation triggering speed, wherein the ignition timing control unit advances the ignition timing of the ignition plug and increases the speed of the internal combustion engine if the speed of the internal combustion engine detected at the predetermined intervals decreases below the automatic stop operation triggering speed without being the automatic stop operation triggering speed, and wherein the automatic stop unit stops the internal combustion engine by stopping the ignition operation of the ignition plug and by cutting off the fuel supply, when the increased speed of the internal combustion engine reaches the automatic stop operation triggering speed. 9. The automatic stop device according to claim 5, further comprising a throttle control unit that reduces an intake air quantity by decreasing an opening degree of a throttle valve at the same time as the ignition timing control unit starts retarding the ignition timing of the ignition plug. 10. The automatic stop device according to claim 5, wherein the internal combustion engine is installed in a motor vehicle that performs an idling stop control to automatically stop the internal combustion engine when an idling stop condition is satisfied during stoppage of the motor vehicle. 11. An internal combustion engine for a vehicle, comprising: an automatic stop device that stops an internal combustion engine by stopping an ignition operation of an ignition plug and by cutting off a fuel supply after a predetermined automatic stop condition is satisfied, comprising: a load control unit that removes a load on the internal combustion engine when the automatic stop condition is satisfied; a load recognition unit that recognizes a magnitude of the load acting on the internal combustion engine before the load is removed by the load control unit; an ignition timing control unit, upon the satisfaction of the automatic stop condition, that selects an ignition timing retard amount of the ignition plug such that the retard amount is increased the greater the magnitude of the load on the internal combustion engine, recognized by the load recognition unit, before the satisfaction of automatic stop condition is satisfied, and retards the ignition timing of the ignition plug by the retard amount at substantially the same moment the load removing operation is executed by the load control unit; and an automatic stop unit that stops the internal combustion engine by stopping the ignition operation of the ignition plug and by cutting off the fuel supply when a speed of the internal combustion engine reaches a predetermined automatic stop operation triggering speed through the retarding of the ignition timing of the ignition plug by the ignition timing control unit, wherein, when an internal combustion engine restart condition is satisfied after the internal combustion engine is stopped by the automatic stop device, fuel is supplied to an initial combustion target cylinder in an intake stroke in the stop condition and the ignition operation of the ignition plug is started when the cylinder performs an expansion stroke. 12. An automatic stop method for an internal combustion engine that executes an automatic internal combustion engine stop control to stop the operation of an internal combustion engine after a predetermined automatic stop condition is satisfied, comprising: removing a load on the internal combustion engine or reducing the load to a predetermined level when the automatic stop condition is satisfied; recognizing a magnitude of the load acting on the internal combustion engine before the load is removed or reduced; calculating a difference between the magnitude of the load on the internal combustion engine before and after the automatic stop condition is satisfied in accordance with the magnitude of the load on the internal combustion engine; selecting an ignition timing retard amount of an ignition plug such that the retard amount is increased the greater the difference between the magnitude of the load before and after the automatic stop condition is satisfied; and retarding the ignition timing of the ignition plug by the retard amount at substantially the same moment as the load removing operation or the load reducing operation is executed, before the automatic stop control is initiated. 13. The automatic stop method according to claim 12, further comprising reducing an intake air quantity by decreasing an opening degree of a throttle valve at the same time as the retarding of the ignition timing of the ignition plug is started. 14. The automatic stop method according to claim 12, wherein the internal combustion engine is installed in a motor vehicle that performs an idling stop control to automatically stop the internal combustion engine when an idling stop condition is satisfied during stoppage of the motor vehicle. 15. An automatic stop method for automatically stopping an internal combustion engine by stopping an ignition operation of an ignition plug and by cutting off a fuel supply after satisfaction of a predetermined automatic stop condition for the internal combustion engine, comprising: removing a load on the internal combustion engine when the automatic stop condition is satisfied; recognizing a magnitude of the load acting on the internal combustion engine before the load is removed; selecting an ignition timing retard amount of the ignition plug such that the retard amount is increased the greater the magnitude of the load before the automatic stop condition is satisfied; retarding the ignition timing of the ignition plug by the retard amount at substantially the same moment the load removing operation is executed; and stopping the internal combustion engine by stopping the ignition operation of the ignition plug and by cutting off the fuel supply when a speed of the internal combustion engine reaches a predetermined automatic stop operation triggering speed through the retarding of the ignition timing of the ignition plug. 16. The automatic stop method according to claim 15, wherein, the ignition operation of the ignition plug is stopped first and then the fuel supply is cut off, when the speed of the internal combustion engine reaches the predetermined automatic stop operation triggering speed through the retarding operation of the ignition of the ignition timing of the ignition plug. 17. The automatic stop method according to claim 15, wherein the internal combustion engine is a multi-cylinder internal combustion engine, and the ignition operation of the ignition plug is stopped and the fuel supply is cut off such that, when the internal combustion engine is stopped, a piston in a cylinder in an intake stroke is stopped near a top dead center. 18. The automatic stop method according to claim 15, wherein the ignition operation of the ignition plug is stopped and the fuel supply is cut off when a speed of the internal combustion engine detected at predetermined intervals reaches the predetermined automatic stop operation triggering speed, wherein the ignition timing of the ignition plug is advanced to increase the speed of the internal combustion engine if the speed of the internal combustion engine detected at predetermined intervals decreases below the automatic stop operation triggering speed without being the automatic stop operation triggering speed, and wherein the internal combustion engine is stopped by stopping the ignition operation of the ignition plug and by cutting off the fuel supply when the increased speed of the internal combustion engine reaches the automatic stop operation triggering speed. 19. The automatic stop method according to claim 15, further comprising reducing an intake air quantity by decreasing an opening degree of a throttle valve at the same time as the retarding of the ignition timing of the ignition plug is started. 20. The automatic stop method according to claim 15, wherein the internal combustion engine is installed in a motor vehicle that performs an idling stop control to automatically stop the internal combustion engine when an idling stop condition is satisfied during stoppage of the motor vehicle. 21. An automatic stop device for an internal combustion engine that executes an automatic internal combustion engine stop control to stop the operation of the internal combustion engine after a predetermined automatic stop condition is satisfied, comprising: load control means for removing a load on the internal combustion engine or reducing the load to a predetermined level when the automatic stop condition is satisfied; load recognition means for recognizing a magnitude of the load acting on the internal combustion engine before the load is removed or reduced by the load control means; and ignition timing control means, upon the satisfaction of the automatic stop condition, for calculating a difference between the magnitude of the load on the internal combustion engine before and after the automatic stop condition is satisfied in accordance with the magnitude of the load on the internal combustion engine, selecting an ignition timing retard amount of an ignition plug such that the retard amount is increased the greater the difference between the magnitude of the load on the internal combustion engine before and after the automatic stop condition is satisfied, and retarding the ignition timing of the ignition plug by the retard amount at substantially the same moment as the load removing operation or the load reducing operation is executed by the load control means, before the automatic stop control is initiated. 22. An automatic stop device that stops an internal combustion engine by stopping an ignition operation of an ignition plug and by cutting off a fuel supply after a predetermined automatic stop condition is satisfied, comprising: load control means for removing a load on the internal combustion engine when the automatic stop condition is satisfied; load recognition means recognizing a magnitude of the load acting on the internal combustion engine before the load is removed by the load control means; ignition timing control means, upon the satisfaction of the automatic stop condition, for selecting an ignition timing retard amount of the ignition plug such that the retard amount is increased the greater the magnitude of the load on the internal combustion engine, recognized by the load recognition means, before the satisfaction of automatic stop condition is satisfied, and retarding the ignition timing of the ignition plug by the retard amount at substantially the same moment the load removing operation is executed by the load control means; and automatic stop means for stopping the internal combustion engine by stopping the ignition operation of the ignition plug and by cutting off the fuel supply when a speed of the internal combustion engine reaches a predetermined automatic stop operation triggering speed through the retarding of the ignition timing of the ignition plug by the ignition timing control means.