A control system for an engine includes: a valve that adjusts an intake air filling amount for a cylinder according to an operation amount of an accelerator pedal; a sensor that outputs a measurement signal related to a temperature of an upper end of a cylinder head having an intake port and an exhaust port communicating with the cylinder; and a control circuit that sets an upper limit value of the intake air filling amount to be smaller as the temperature of the upper end of the cylinder head is reduced base on the measurement signal at the start of an engine, and outputs, to the valve, a control signal corresponding to the operation amount of the accelerator pedal within a range where the intake air filling amount does not exceed the upper limit value.

A control system for an engine includes: a valve that adjusts an intake air filling amount for a cylinder according to an operation amount of an accelerator pedal; a sensor that outputs a measurement signal related to a temperature of an upper end of a cylinder head having an intake port and an exhaust port communicating with the cylinder; and a control circuit that sets an upper limit value of the intake air filling amount to be smaller as the temperature of the upper end of the cylinder head is reduced base on the measurement signal at the start of an engine, and outputs, to the valve, a control signal corresponding to the operation amount of the accelerator pedal within a range where the intake air filling amount does not exceed the upper limit value.

A vehicle includes an engine, an intake manifold, a starter motor, a battery, and a control apparatus. The intake manifold is coupled to the engine. The starter motor is configured to start up the engine. The battery is configured to drive the starter motor. The control apparatus includes one or more processors, and one or more memories coupled to the one or more processors. The one or more processors are configured to execute idle reduction control, and execute, during execution of the idle reduction control and before cancelling the idle reduction control, adjustment control of adjusting an internal pressure of the intake manifold and causing the internal pressure of the intake manifold to be lower as a voltage of the battery is lower.

A vehicle includes an engine, an intake manifold, a starter motor, a battery, and a control apparatus. The intake manifold is coupled to the engine. The starter motor is configured to start up the engine. The battery is configured to drive the starter motor. The control apparatus includes one or more processors, and one or more memories coupled to the one or more processors. The one or more processors are configured to execute idle reduction control, and execute, during execution of the idle reduction control and before cancelling the idle reduction control, adjustment control of adjusting an internal pressure of the intake manifold and causing the internal pressure of the intake manifold to be lower as a voltage of the battery is lower.

A control system for an engine includes: a valve that adjusts an intake air filling amount for a cylinder according to an operation amount of an accelerator pedal; a sensor that outputs a measurement signal related to a temperature of an upper end of a cylinder head having an intake port and an exhaust port communicating with the cylinder; and a control circuit that sets an upper limit value of the intake air filling amount to be smaller as the temperature of the upper end of the cylinder head is reduced base on the measurement signal at the start of an engine, and outputs, to the valve, a control signal corresponding to the operation amount of the accelerator pedal within a range where the intake air filling amount does not exceed the upper limit value.

A control system for an engine includes: a valve that adjusts an intake air filling amount for a cylinder according to an operation amount of an accelerator pedal; a sensor that outputs a measurement signal related to a temperature of an upper end of a cylinder head having an intake port and an exhaust port communicating with the cylinder; and a control circuit that sets an upper limit value of the intake air filling amount to be smaller as the temperature of the upper end of the cylinder head is reduced base on the measurement signal at the start of an engine, and outputs, to the valve, a control signal corresponding to the operation amount of the accelerator pedal within a range where the intake air filling amount does not exceed the upper limit value.