An engine idle control method of an off highway vehicle. The method including the steps of: detecting a static load on the engine; detecting a dynamic load on the engine; determining if the static load is below a predetermined static level; determining if the dynamic load is less than a predetermined range; and engaging an auto-idle feature dependent upon both of the determining steps being true.

System, method, and apparatus for controlling performance of an engine in response to a set of outputs from a device to an engine control unit. The engine control unit receives profile parameters that are related to outputs of the device. The engine control unit engages a high performance functionality in response to a first signal. The engine control unit engages a high idle functionality in response to a second signal.

System, method, and apparatus for controlling performance of an engine in response to a set of outputs from a device to an engine control unit. The engine control unit receives profile parameters that are related to outputs of the device. The engine control unit engages a high performance functionality in response to a first signal. The engine control unit engages a high idle functionality in response to a second signal.

A system includes an exhaust aftertreatment system in exhaust gas receiving communication with an engine including a plurality of cylinders where the engine is structured to operate according to low load conditions and where a controller is structured to determine that at least one diesel emissions fluid (DEF) doser is frozen based on at least one of an ambient air temperature and a DEF source temperature. The controller is structured to operate the engine according to a skip-fire mode in response to a DEF flag indicating that the at least one DEF doser is frozen. The skip-fire mode comprises firing a portion of the plurality of cylinders that is less than a total amount of cylinders of the plurality of cylinders. The controller is structured to discontinue the skip-fire mode in response to determining that the at least one DEF doser is likely thawed.

A method and a device for diagnosing a ventilation line of a motor vehicle are provided. The ventilation line is arranged between a fuel tank and an activated carbon filter. The motor vehicle has a control unit (ECU) and is powered by an internal combustion engine. The state of a vacuum switch is evaluated for the diagnosis.

A system for controlling operations of an engine comprises a plurality of cylinders and a controller operatively coupled to each of the plurality of cylinders. The controller is configured to determine an operating condition of the engine, and in response to determining that the operating condition is suitable for activating less then all cylinders of the plurality of cylinders during a cycle of the engine, determine a first firing pattern, and a second firing pattern different from the first firing pattern for activating the plurality of cylinders of the engine. The controller is configured to activate a first set of cylinders of the plurality of cylinders based on the first firing pattern, and subsequent to activating the first set of cylinders, activate a second set of cylinders of the plurality of cylinders different from the first set of cylinders based on the second firing pattern.

A system for controlling operations of an engine comprises a plurality of cylinders and a controller operatively coupled to each of the plurality of cylinders. The controller is configured to determine an operating condition of the engine, and in response to determining that the operating condition is suitable for activating less then all cylinders of the plurality of cylinders during a cycle of the engine, determine a first firing pattern, and a second firing pattern different from the first firing pattern for activating the plurality of cylinders of the engine. The controller is configured to activate a first set of cylinders of the plurality of cylinders based on the first firing pattern, and subsequent to activating the first set of cylinders, activate a second set of cylinders of the plurality of cylinders different from the first set of cylinders based on the second firing pattern.

This engine comprises an engine body and an ECU. The ECU is configured to execute a high idling limitation when a prescribed condition is fulfilled during startup. When executing a high idle limitation, the ECU determines a first upper limit speed, which is an upper limit value of high idling speed, and a first limitation time, which is a time during which the high idling limitation continues, on the basis of the engine temperature during startup. Based on the temperature of the environment, the ECU determines a second upper limit speed, which is an upper limit value of high idling speed, and a second limitation time, which is a time during which the high idling limitation continues. The ECU executes the high idling limitation based on either the determined first upper limit speed or second upper limit speed, and either the first limitation time or the second limitation time.

This engine comprises an engine body and an ECU. The ECU is configured to execute a high idling limitation when a prescribed condition is fulfilled during startup. When executing a high idle limitation, the ECU determines a first upper limit speed, which is an upper limit value of high idling speed, and a first limitation time, which is a time during which the high idling limitation continues, on the basis of the engine temperature during startup. Based on the temperature of the environment, the ECU determines a second upper limit speed, which is an upper limit value of high idling speed, and a second limitation time, which is a time during which the high idling limitation continues. The ECU executes the high idling limitation based on either the determined first upper limit speed or second upper limit speed, and either the first limitation time or the second limitation time.

An engine control device for a saddle riding vehicle includes a mechanical centrifugal clutch for connecting and disconnecting driving force from an engine to a driving wheel, a throttle operator to adjust output power of the engine, a motor to rotate a crankshaft of the engine, and a control unit to control the motor and a fuel injection system. The control unit executes injection stopping control for stopping fuel injection during deceleration of the vehicle and executes, when an opening operation of the throttle operator is performed after an engine speed becomes equal to or lower than a centrifugal clutch disconnection speed at which the centrifugal clutch is disconnected, acceleration assist control for rotating the crankshaft with the motor.