Engine system

Abstract

Provided is an engine system capable of immediately restarting the engine when driver change of mind is detected while the engine rotational speed is being reduced by idle-stop control. The engine system (1), in which an electric assist turbocharger (4) combining a turbocharger with a motor (3) is connected to the intake and exhaust system of an engine (2), is provided with an idle stop control unit (26) that cuts off fuel injection to the engine (2) when the engine (2) is idle while a vehicle is stopped. The idle stop control unit (26) is configured to restart the engine (2) by resuming fuel injection to the engine (2) while operating the motor (3) when a change of mind is detected during idle-stop control.

Description

technical field [0001] The present invention relates to an engine system that performs idling stop control. Background technique [0002] For a long time, in order to improve the fuel efficiency of vehicles (or reduce CO 2 Emissions), the development of an engine stop system (ISS) during idling is actively carried out (for example, refer to Patent Documents 1 to 4). [0003] Such as image 3 As shown in FIG. 1 , when the speed of the engine whose fuel injection is interrupted by idling stop control is reduced, for example, when a driver who receives a situation change such as a red light signal changing to a green light signal performs a re-acceleration action (change of mind, change of mind), The ISS that detects the reacceleration operation restarts the engine in order to reaccelerate the vehicle, but the control at the time of restarting greatly differs depending on the engine speed when the reacceleration operation is detected. [0004] When the engine speed is the ind...

AI Technical Summary

Problems solved by technology

Downsizing the engine can reduce the reduction in fuel efficiency caused by friction inside the engine

[0018] Due to the reduction of the engine torque due to the reduction of the displacement of the downsized engine, a turbocharger is installed to boost the power performance to improve the power performance. The energy is further reduced, so it is difficult to rotate the exhaust turbine and the intake compressor of the turbocharger with good responsiveness, and generally speaking, the engine performance is reduced.

[0019] It is desired to further improve fuel efficiency performance by including an ISS in a downsized engine. However, as mentioned above, since the frequency of starting the engine immediately after the engine is stopped and restarted increases with the ISS, ensuring engine performance in a downsized engine becomes a problem.

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