US 10,450,980 B2Granted

Control device for internal combustion engine

AssigneeNissan Motor Co., Ltd.

InventorsTakamitsu Hase, Kenichi Tsubaki, Mitsuru Yoichi

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Abstract

During a fuel cut-off control, if a vehicle deceleration rate becomes greater than a rapid deceleration determination value, which is calculated based on a rotational resistance of internal combustion engine 1, a vehicle is determined to be in a state of rapid deceleration. The rapid deceleration determination value is set to decrease as the rotational resistance of internal combustion engine 1 increases. The rotational resistance thereof increases as the vehicle speed decreases, and increases as a transmission gear ratio increases. Thereby, during decelerating on a high vehicle speed side, an erroneous determination of rapid deceleration due to a longitudinal vibration of the vehicle that occurs when the fuel cut-off control starts can be prevented, and during decelerating on a low vehicle speed side, a determination of rapid deceleration can be implemented to terminate the fuel cut-off control and thereby prevent the internal combustion engine 1 from being stopped.

Claims20

Dependent claims

An internal combustion engine control apparatus comprising:

an internal combustion engine mounted in a vehicle;
a fuel cut-off control means configured to implement a fuel cut-off control of cutting off fuel supply to the internal combustion engine;
and
a deceleration state determination means configured to determine a deceleration state of the vehicle during the fuel cut-off control;
wherein the internal combustion engine control apparatus is configured to stop the fuel cut-off control in response to a determination that the deceleration state of the vehicle is rapid deceleration;
wherein the deceleration state determination means is configured to determine that the deceleration state of the vehicle is rapid deceleration, in response to a condition that a deceleration rate of the vehicle becomes greater than a rapid deceleration determination value, wherein the rapid deceleration determination value is calculated based on a rotational resistance of the internal combustion engine;
wherein the rotational resistance depends on a vehicle speed and a transmission gear ratio;
and
wherein the rapid deceleration determination value is set so as to decrease as the rotational resistance of the internal combustion engine increases.

6 more elements

Dependencies are inferred from the claim text.