An engine idle reduction control apparatus includes a first data acquiring unit, a detecting unit, a first determining unit, a control unit, and a second determining unit. The detecting unit is configured to detect a traffic circle, on the basis of traveling environment data acquired by the first data acquiring unit. The control unit is configured to execute an idle reduction, in a case where the first determining unit determines that a control condition for a pre-stop idle reduction control is satisfied. The second determining unit is configured to determine whether a prohibition condition for the pre-stop idle reduction control is satisfied, in a case where the traffic circle is detected. The control unit is configured to prohibit the idle reduction even in a case where the control condition is determined to be satisfied, on a condition that the prohibition condition is determined to be satisfied.

An engine-driven working machine including a controller by which a time period until the rotation speed limitation mode is canceled can be shortened. After a throttle valve is moved to a fully-closed position by an operation to allow the engine to finish the fast idling state and while the engine is transited to an idling state, the controller cancels the rotation speed limitation mode by detecting an event in which a cycle period of rotation speed variations of the engine is longer than a cycle period of rotation speed variation in the fast idling state.

A jet propelled watercraft includes a reverse gate that moves to a first position and to a second position. When the reverse gate is in the first position, the reverse gate causes a vessel body to move forward. When the reverse gate is in the second position, the reverse gate causes the vessel body to decelerate or move backward. A velocity mode selector is used to select a normal mode or a velocity mode. The velocity mode has a maximum velocity different from that of the normal mode. When the reverse gate is in the second position and the velocity mode is selected, a controller is configured or programmed to set an upper limit of an engine rotation speed in the velocity mode to be different from that of the engine rotation speed in the normal mode.

Methods, systems, and computer program products are provided for controlling an internal combustion that comprises a cylinder having a space arranged to receive air and fuel, a piston disposed in the cylinder, and a crankcase being in fluid communication with the cylinder. The method comprises determining an uncontrolled behavior due to fluid flow between said crankcase and said cylinder space and combustion of such fluid, which entails: determining whether a powertrain of the vehicle is disengaged; determining whether the engine speed is increasing; and determining whether said cylinder space is receiving fuel. The method further comprises determining that an uncontrolled behavior is occurring if the conditions that: said powertrain is disengaged, the engine speed is increasing and said cylinder space is not receiving any fuel, are fulfilled.

Methods and systems are provided to control exhaust energy delivered to a turbine of a turbine-generator coupled to a split exhaust engine system in order to limit turbine over-speed conditions and/or reduce generator vibration or reduce component over-heating conditions. In one example, a method may comprise in response to turbine speed greater than a threshold speed, selectively deactivating a first exhaust valve of one or more cylinders of a first and second cylinder group.

Systems and a method are provided for determining a change in performance of a radiator fan. In one example, a system includes a controller configured to receive a signal output from an accelerometer positioned proximately to and/or operatively coupled with a bearing of a radiator fan, process the signal to determine a peak to peak acceleration value, and indicate a change in performance of the radiator fan when the peak to peak acceleration value is greater than a designated threshold value.

A prime mover control device for a work vehicle, includes: a rotation speed control unit that controls a rotation speed of a prime mover in correspondence to an operation quantity of an accelerator operation member; a temperature detection unit that detects a temperature of cooling oil used to cool a brake; and a speed limiting unit that limits a maximum rotation speed of the prime mover by setting a lower limit for the maximum rotation speed when the temperature of the cooling oil detected by the temperature detection unit is higher than a predetermined temperature, compared to a limit set when the temperature of the cooling oil detected by the temperature detection unit is lower than the predetermined temperature, wherein: a maximum vehicle speed is limited by limiting the maximum rotation speed of the prime mover by the speed limiting unit.

An engine system may include a fuel and air supply circuit and an exhaust circuit, a temperature sensor mounted on an exterior of the engine and an oxygen sensor located in the exhaust circuit. The fuel and air supply circuit may include a throttle body mounted on the engine and having a throttle valve to control the flow rate of air delivered to the engine, a fuel injector carried by the throttle body to deliver fuel to the engine and a fuel rail carried by at least one of the throttle body and the fuel injector and having an input to receive a supply of fuel and an outlet through which fuel is routed to the fuel injector. An engine control unit may be communicated with these components to control the fuel and air mixture provided to the engine as a function of the temperature and oxygen sensor outputs.

Disclosed is a method for controlling a speed of a vehicle combustion engine, the engine including at least one combustion chamber, into which a mixture of air and fuel is injected, and an air box, configured to inject the air into the combustion chamber and having an air flow rate controlled by a regulating butterfly valve, the regulating butterfly valve having a variable angular position, controlled by a predetermined position of an actuator. The method includes the steps of evaluating a so-called “load” resistant torque resulting from a plurality of external loads applied to the engine, determining, from the calculated load resistant torque, a position of the actuator, so as to determine an angular position of the regulating butterfly valve, and controlling the position of the actuator, so as to control the engine speed.

Disclosed is a method of controlling an internal combustion engine (102) of a UAV (100), and also disclosed is a UAV engine system (101), The engine (102) has a fuel delivery means (123) operable to deliver a fuel to a combustion chamber of the engine, and an air flow control means (107) for regulating air flow to the combustion chamber. The method comprises controlling the engine (102) through control of fuelling by way of the fuel delivery means (123) independently of the air flow control means (107), including determining a fuelling requirement for the engine based on a request from a flight control system, and determining an air flow requirement based on or with reference to the fuelling requirement. This provides for fuel-led control of the engine system (101). Specifically, a fuelling requirement for the engine (102) is determined and implemented, and the corresponding air requirement is then determined contingent upon the fuelling requirement.