Disclosed is a fuel injection control system for a single-cylinder diesel engine, comprising: a set of operating condition sensors including an accelerator pedal position sensor and a cooling water temperature sensor, an input signal interface capable of receiving an input signal from the operating condition sensors, a control unit connected to the input signal interface, and a rotational speed sensor provided at a camshaft or starting shaft of the single-cylinder diesel engine. The rational speed sensor is connected to the control unit via a rotational speed correction circuit. The control system can easily and quickly determine the rotational speed and operating stroke of the single-cylinder diesel engine, so as to quickly determine the fuel injection quantity and injection timing of the single-cylinder diesel engine in real time.

A control system for a vehicular supercharger regulates the flow of a vacuum signal to a boost valve to modulate the supply of compressed air to an internal combustion engine. In one embodiment, the control system includes a solenoid that regulates the vacuum signal in response to one or more vehicle sensor signals inputted to an electronic controller.

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.

An engine system is mounted on a vehicle and includes an engine and a turbocharger. The engine system control apparatus includes: a driving state identifier that identifies a driving state of the vehicle from a plurality of driving states; a surge determiner that determines whether a surge condition as a condition under which a surge noise is generated is satisfied, based on the identified driving state of the vehicle and an operating state of the engine; and a variable nozzle controller that controls, based on the identified driving state of the vehicle and the operating state of the engine, an opening degree of a variable nozzle of the turbocharger to be varied in an open direction, upon determination by the surge determiner that the surge condition is satisfied.

Systems and methods for operating an engine with deactivating and non-deactivating valves are presented. In one example, estimates of engine fuel consumption for operating the engine with a plurality of cylinder modes or patterns while a transmission is engaged in different gears are determined and are used as a basis for deactivating engine cylinders.

A controller for a vehicle, the vehicle including an engine and a transmission gear device, the controller includes an electronic control unit. The electronic control unit is configured to: (i) stop the engine automatically when predetermined engine stopping conditions are fulfilled, the predetermined engine stopping conditions including fulfillment of a shift position condition of the transmission gear device, (ii) start the engine automatically when a predetermined waiting time has elapsed since a change in shift position, and (iii) change the waiting time depending on the duration of an automatic stop of the engine.

A control system for an engine is provided. The control system includes an accelerator opening acquiring module for acquiring an opening of an accelerator, a target acceleration setting module for setting a target acceleration of a vehicle based on the accelerator opening acquired by the accelerator opening acquiring module, and an engine control module for adjusting an engine torque to achieve the target acceleration set by the target acceleration setting module. Within a predetermined range of the accelerator opening, the target acceleration setting module sets the target acceleration corresponding to the accelerator opening acquired by the accelerator opening acquiring module, to cause a change of the target acceleration with respect to a change of the accelerator opening to be substantially constant regardless of an operating state of the vehicle, the predetermined range including a value of the accelerator opening at which the target acceleration becomes zero.

A method of regenerating a lean NOx trap (LNT) of an exhaust purification system provided with the LNT and a selective catalytic reduction (SCR) catalyst may include: determining whether a regeneration release condition of the LNT is satisfied; determining whether a regeneration demand condition of the LNT is satisfied; and performing regeneration of the LNT if the regeneration release condition of the LNT and the regeneration demand condition of the LNT are satisfied. In particular, the regeneration release condition of the LNT is satisfied if all of an engine operating condition, an LNT state condition, and a lambda sensor synchronization condition are satisfied.

Methods and systems are presented for assessing the presence or absence of engine torque deviation which may indicate air-fuel ratio imbalance between engine cylinders. In one example, the method may include assessing the presence or absence of engine torque variation based on engine torque deviation from a desired engine torque during a deceleration fuel shut-off event.

A motor-driven supercharger includes a compressor, an electric motor, and a controller. The compressor is arranged in the intake passage of the engine. The electric motor drives the compressor. The controller is configured to start detection of the rotational position of the electric motor at least on the condition that a brake operation amount, which is the operation amount of a brake operation member of the vehicle, becomes less than or equal to a threshold. The controller is configured to start forced induction with the electric motor when an acceleration operation amount, which is the operation amount of an acceleration operation member of the vehicle, becomes more than or equal to a threshold.