A throttle body fuel injection system and method that is arranged to easily replace four-barrel carburetors includes a throttle body assembly with four main bores, each with a throttle plate and an associated fuel injector. Each injector feeds fuel into a circular fuel distribution ring via a fuel injection conduit, which introduces pressurized fuel into the air stream. The fuel distribution rings and bores have profiles that avoid constrictions for to prevent low pressure zones according to the Venturi effect. The throttle body includes an idle air control circuit having a port opening into main intake bores downstream of the point of fuel distribution into the air stream, thereby reducing the tendency for a lean fuel mixture at idle. An ECU “feed forward” algorithm controls fuel injection as a function of the position of the idle air control valve.

A throttle body fuel injection system and method that is arranged to easily replace four-barrel carburetors includes a throttle body assembly with four main bores, each with a throttle plate and an associated fuel injector. Each injector feeds fuel into a circular fuel distribution ring via a fuel injection conduit, which introduces pressurized fuel into the air stream. The fuel distribution rings and bores have profiles that avoid constrictions for to prevent low pressure zones according to the Venturi effect. The throttle body includes an idle air control circuit having a port opening into main intake bores downstream of the point of fuel distribution into the air stream, thereby reducing the tendency for a lean fuel mixture at idle. An ECU “feed forward” algorithm controls fuel injection as a function of the position of the idle air control valve.

A system and method for automatically controlling an engine of a turf-care vehicle. The method comprises receiving, at an engine speed control module, a mode selection input from an engine speed control mode selection device. The mode selection input is indicative of one a plurality of engine speed control modes, and all of the engine speed control modes are implementable by the engine speed control module. The method additionally comprises monitoring, via the engine speed control module, an operating status of one or more vehicle systems and/or one or more vehicle sensors. The method further comprises automatically controlling, via the engine speed control module, a rotational speed of the engine based at least in part on the selected engine speed control mode and the operating status of the one or more vehicle systems and/or one or more vehicle sensors.

A system and method for automatically controlling an engine of a turf-care vehicle. The method comprises receiving, at an engine speed control module, a mode selection input from an engine speed control mode selection device. The mode selection input is indicative of one a plurality of engine speed control modes, and all of the engine speed control modes are implementable by the engine speed control module. The method additionally comprises monitoring, via the engine speed control module, an operating status of one or more vehicle systems and/or one or more vehicle sensors. The method further comprises automatically controlling, via the engine speed control module, a rotational speed of the engine based at least in part on the selected engine speed control mode and the operating status of the one or more vehicle systems and/or one or more vehicle sensors.

A method of controlling an idle speed for an engine of a vehicle includes the steps of sensing a vehicle speed and a parking brake position. Clutch position is also sensed. When it is determined that the vehicle speed is below a maximum vehicle speed, the parking brake is released, and the clutch is depressed, the engine idle speed is increased from a base idle speed to a launch idle speed.

A method of controlling an idle speed for an engine of a vehicle includes the steps of sensing a vehicle speed and a parking brake position. Clutch position is also sensed. When it is determined that the vehicle speed is below a maximum vehicle speed, the parking brake is released, and the clutch is depressed, the engine idle speed is increased from a base idle speed to a launch idle speed.

A method for detecting defective injectors includes operating an internal combustion engine in an idling mode and deactivating mixture control of the internal combustion engine. The method also includes switching off selectively each injector of the respective injection group, detecting the change in the characteristic value when the respective injector is switched off, and checking a fault criterion. The fault criterion is satisfied when the change in the characteristic value for the respective switched-off injector exceeds or undershoots a predetermined amount. The method also includes detecting a defect in the respective injector in response to the fault criterion being satisfied.

A method for detecting defective injectors includes operating an internal combustion engine in an idling mode and deactivating mixture control of the internal combustion engine. The method also includes switching off selectively each injector of the respective injection group, detecting the change in the characteristic value when the respective injector is switched off, and checking a fault criterion. The fault criterion is satisfied when the change in the characteristic value for the respective switched-off injector exceeds or undershoots a predetermined amount. The method also includes detecting a defect in the respective injector in response to the fault criterion being satisfied.

The present disclosure relates to a hybrid electric vehicle configured to respond to a required torque while reducing exhaust gas emission in a situation where catalyst heating of an engine is not completed, and a driving control method for the hybrid electric vehicle. The driving control method of the hybrid electric vehicle comprises entering catalyst heating control of an engine when there is a request for catalyst heating and a required torque exceeds a first threshold during traveling in a first mode using an electric motor as a driving source, and entering acceleration feeling increase control when the required torque exceeds a second threshold greater than the first threshold, in which the second threshold is set between the first threshold and a third threshold that is a reference for an entry into a second mode using the engine as the driving source.

A shovel enabled to set an engine revolution speed to revolution speeds including a revolution speed for a running operation and a revolution speed for an idling running operation that is lower than the revolution speed for the running operation includes an engine provided as a driving source of the shovel, an operating part configured to be driven by a driving force of the engine, an operation component configured to operate the operating part, a detecting device configured to detect a position of a movable portion of an operator and a position of the operation component, an operation determining part configured to determine a positional relationship between the movable portion and the operation component, and a control part configured to set the engine revolution speed of the engine based on the positional relationship between the movable portion and the operation component that is determined by the operation determining part.