Internal combustion engine

1. An internal combustion engine comprising:

an internal combustion engine body including an intake valve and an exhaust valve;

a controller configured or programmed to perform a control to set a rotational speed of the internal combustion engine body to a predetermined rotational speed based on an environmental temperature at a time of starting the internal combustion engine body, and perform a control to drive the internal combustion engine body at the set predetermined rotational speed during a time period until when fuel is supplied to a combustion chamber of the internal combustion engine body and first ignition is performed; and

a variable valve mechanism configured to adjust an opening-closing timing of the intake valve under control of the controller; wherein

the controller is configured or programmed to perform a timing control to set a closing timing of the intake valve based on the predetermined rotational speed such that a largest amount of outside air is introduced.

2. The internal combustion engine according to claim 1 , wherein the controller is configured or programmed to continue the timing control until a first cycle in which the fuel is supplied to the combustion chamber and the first ignition is performed, and to control the variable valve mechanism to restore a valve timing of the intake valve to that during steady operation in second and subsequent cycles.

3. An internal combustion engine comprising:

an internal combustion engine body including an intake valve and an exhaust valve; and

a controller configured or programmed to perform a control to set a rotational speed of the internal combustion engine body to a predetermined rotational speed based on an environmental temperature at a time of starting the internal combustion engine body, and perform a control to drive the internal combustion engine body at the set predetermined rotational speed during a time period until when fuel is supplied to a combustion chamber of the internal combustion engine body and first ignition is performed; wherein

the controller is configured or programmed to supply the fuel to the combustion chamber and perform the first ignition at a timing at which a temperature in the combustion chamber exceeds a predetermined set temperature based on an estimation logic for estimating the temperature in the combustion chamber.

4. The internal combustion engine according to claim 3 , wherein the estimation logic includes a map showing a relationship between the temperature in the combustion chamber and driving duration of the internal combustion engine body at the predetermined rotational speed.

5. An internal combustion engine comprising:

an internal combustion engine body including an intake valve and an exhaust valve;

a controller configured or programmed to perform a control to set a rotational speed of the internal combustion engine body to a predetermined rotational speed based on an environmental temperature at a time of starting the internal combustion engine body, and perform a control to drive the internal combustion engine body at the set predetermined rotational speed during a time period until when fuel is supplied to a combustion chamber of the internal combustion engine body and first ignition is performed; and

a temperature sensor to measure a temperature in an intake pipe; wherein

the controller is configured or programmed to supply the fuel to the combustion chamber and perform the first ignition at a timing at which the temperature measured by the temperature sensor exceeds a predetermined set temperature.

6. The internal combustion engine according to claim 1 , wherein the environmental temperature includes at least one of a temperature of outside air around the internal combustion engine body or a temperature of cooling water of the internal combustion engine body.

7. The internal combustion engine according to claim 1 , further comprising:

a hybrid drive motor to drive a piston; wherein

the controller is configured or programmed to set the rotational speed of the internal combustion engine body to the predetermined rotational speed based on the environmental temperature at the time of starting the internal combustion engine body, and to control the hybrid drive motor to drive the internal combustion engine body at the set predetermined rotational speed during the time period until when the fuel is supplied to the combustion chamber and the first ignition is performed.

8. The internal combustion engine according to claim 3 , wherein the environmental temperature includes at least one of a temperature of outside air around the internal combustion engine body or a temperature of cooling water of the internal combustion engine body.

9. The internal combustion engine according to claim 3 , further comprising:

a hybrid drive motor to drive a piston; wherein

the controller is configured or programmed to set the rotational speed of the internal combustion engine body to the predetermined rotational speed based on the environmental temperature at the time of starting the internal combustion engine body, and to control the hybrid drive motor to drive the internal combustion engine body at the set predetermined rotational speed during the time period until when the fuel is supplied to the combustion chamber and the first ignition is performed.

10. The internal combustion engine according to claim 5 , wherein the environmental temperature includes at least one of a temperature of outside air around the internal combustion engine body or a temperature of cooling water of the internal combustion engine body.

11. The internal combustion engine according to claim 5 , further comprising:

a hybrid drive motor to drive a piston; wherein

the controller is configured or programmed to set the rotational speed of the internal combustion engine body to the predetermined rotational speed based on the environmental temperature at the time of starting the internal combustion engine body, and to control the hybrid drive motor to drive the internal combustion engine body at the set predetermined rotational speed during the time period until when the fuel is supplied to the combustion chamber and the first ignition is performed.