Warm-up control apparatus and warm-up control method for internal combustion engine

A warm-up control apparatus of an internal combustion engine, comprising:

• a brake booster that uses a negative pressure in an intake pipe of the internal combustion engine;
• and
• a control portion which performs a warm-up control of the internal combustion engine by retarding an ignition timing and increasing an amount of intake air introduced into the internal combustion engine via the intake pipe, and which reduces the amount of intake air set in relation to the warm-up control if an accelerator is off while a vehicle is running at or above a predetermined vehicle speed during execution of the warm-up control.

A warm-up control apparatus of an internal combustion engine, comprising:

• a brake booster that uses a negative pressure in an intake pipe of the internal combustion engine;
• and
• a control portion which performs a warm-up control of the internal combustion engine by retarding an ignition timing and increasing an amount of intake air introduced into the internal combustion engine via the intake pipe, and which reduces the amount of intake air set in relation to the warm-up control if a decreasing rate of an amount of accelerator operation is greater than or equal to a predetermined value while a vehicle is running at or above a predetermined vehicle speed during execution of the warm-up control.

A warm-up control apparatus of an internal combustion engine, comprising:

• a brake booster that uses a negative pressure in an intake pipe of the internal combustion engine;
• and
• a control portion which performs a warm-up control of the internal combustion engine by retarding an ignition timing and increasing an amount of intake air introduced into the internal combustion engine via the intake pipe, and which reduces the amount of intake air set in relation to the warm-up control if an increasing rate of a degree of throttle opening is greater than or equal to a predetermined value during execution of the warm-up control.

A warm-up control apparatus of an internal combustion engine, comprising:

• a brake booster that uses a negative pressure in an intake pipe of the internal combustion engine;
• and
• a control portion which performs a warm-up control of the internal combustion engine by retarding an ignition timing and increasing an amount of intake air introduced into the internal combustion engine via the intake pipe, and which reduces the amount of intake air set in relation to the warm-up control if during execution of the warm-up control, the brake booster uses the negative pressure in the intake pipe or there is a possibility of the brake booster using the negative pressure.

A warm-up control method of an internal combustion engine installed in a vehicle having a brake booster that uses a negative pressure in an intake pipe of the internal combustion engine, the warm-up control method comprising:

• performing a warm-up control of the internal combustion engine by retarding an ignition timing and increasing an amount of intake air introduced into the internal combustion engine via the intake pipe;
• and
• reducing the amount of intake air set in relation to the warm-up control if during execution of the warm-up control it is determined that the brake booster uses the negative pressure in the intake pipe or that there is a possibility of the brake booster using the negative pressure.

A warm-up control method of an internal combustion engine installed in a vehicle having a brake booster that uses a negative pressure in an intake pipe of the internal combustion engine, the warm-up control method comprising:

• performing a warm-up control of the internal combustion engine by retarding an ignition timing and increasing an amount of intake air introduced into the internal combustion engine via the intake pipe;
• and
• reducing the amount of intake air set in relation to the warm-up control if an increasing rate of a degree of throttle opening is greater than or equal to a predetermined value during execution of the warm-up control.