Idle stop control method and device for vehicle with internal combustion engine

An idle stop control device for a vehicle including an internal combustion engine and an automatic transmission, the idle stop control device comprising a controller configured to:

• when the vehicle is at a standstill, perform an idle stop process of stopping combustion of the internal combustion engine with the automatic transmission in a drive range;
• and
• implement the idle stop process by:
• in response to a condition that a predetermined idle stop condition is satisfied after the vehicle has come to a stop, controlling the internal combustion engine by setting a target idle speed of the internal combustion engine to a preset stop-time intermediate idle speed setpoint that is lower than a preset normal idle speed setpoint;
• and
• in response to a condition that an actual speed of the internal combustion engine has reached the stop-time intermediate idle speed setpoint, stopping fuel supply to the internal combustion engine.

An idle stop control device for a vehicle including an internal combustion engine and an automatic transmission, the idle stop control device comprising:

• means for, when the vehicle is at a standstill, performing an idle stop process of stopping combustion of the internal combustion engine with the automatic transmission in a drive range;
• and
• means for implementing the idle stop process by:
• in response to a condition that a predetermined idle stop condition is satisfied after the vehicle has come to a stop, controlling the internal combustion engine by setting a target idle speed of the internal combustion engine to a preset stop-time intermediate idle speed setpoint that is lower than a preset normal idle speed setpoint;
• and
• in response to a condition that an actual speed of the internal combustion engine has reached the stop-time intermediate idle speed setpoint, stopping fuel supply to the internal combustion engine.