A method for stopping an engine within a desired crankshaft angular range is disclosed. In one example, the method may take no control actions if it is determined that the engine will stop within the desired crankshaft angular range. However, if it is determined that the engine may stop outside of the desired crankshaft angular range, expansion combustion may be initiated in a cylinder so that the engine stops in a desired crankshaft angular range.

A first electric power generation device configured to produce an accessory voltage according to a first instruction voltage. A second electric power generation device configured to produce the accessory voltage according to a second instruction. An electric control unit is configured to execute crank position stop control for stopping a crank of the engine at a target position when the engine is stopped by controlling the first electric power generation device such that a current is circulated in the first electric power generation device and the rotating electric machine generates braking torque. The electric control unit is configured to execute the crank position stop control in a state in which the second instruction voltage is equal to or higher than the first instruction voltage.

A control device for an internal combustion engine is programmed, during a catalyst warm-up control, to perform first fuel injection by an injector in an intake stroke, control an ignition device so as to generate a discharge spark in a predetermined period in an expansion stroke, and perform second fuel injection, at a timing retarded from a compression top dead center, such that its injection period overlaps with at least a part of the predetermined period and an end timing of the injection period is advanced from an end timing of the predetermined period. Further, the control device is programmed, during the catalyst warm-up control, to control an actual tumble ratio depending on a result of determination using a first index value representing a speed of initial combustion accompanying an ignition by the ignition device and a second index value representing a speed of main combustion accompanying the ignition.

An internal combustion engine has one or more combustion chambers defined by one of more cylinders, corresponding pistons, and a cylinder head. A crankshaft is operatively connected to the pistons and to an electric turning machine. To start the engine, the electric turning machine rotates the crankshaft in a first direction toward a reversal point corresponding to a local maximum drag torque of the internal combustion engine, this rotation being made without rotating the crankshaft beyond the reversal point. The electric turning machine then rotates the crankshaft in a second direction opposite from the first direction, a momentum impressed on the crankshaft by compression obtained when rotating in the first direction increasing a speed of the crankshaft in the second direction. Thereafter, fuel is injected in one of the combustion chambers in which the corresponding piston first reaches a top dead center position and the fuel is ignited.

A method and system for controlling a stop rotation position of an engine is described. In one example, the system includes an integrated starter/generator that may be selectively coupled to the engine. The integrated starter/generator may rotate the engine in a first direction (e.g., reverse direction) or a second direction (e.g., a forward direction) in response to a position at which the engine stops rotating following cessation of combustion in the engine.

A powertrain system includes a port injection internal combustion engine. A first start process is a process in which fuel is enclosed in a compression stroke cylinder when the engine is stopped, and based on a stored crank stop position, ignition is performed in a first cycle of the compression stroke cylinder upon engine start. A second start process is a process in which, based on the stored crank stop position, fuel injection is performed for an intake stroke cylinder while the engine is stopped, and based on the stored crank stop position, ignition is performed in the first cycle of the intake stroke cylinder upon engine start. When a catalyst temperature at the time engine start is requested is equal to or higher than a first threshold, a control device starts the internal combustion engine by at least one of the first start process and the second start process.

A control apparatus for an electric vehicle includes a first motor (traveling motor) for traveling, a battery (high-voltage battery), a second motor (generator motor) for electricity generation, an engine (rotary engine), a first controller (engine ECU), a second controller (motor ECU), and a sensor (voltage-current sensor). The second controller is configured to start the engine by causing the second motor to perform power running, cause the second motor to perform electricity generation driving such that the battery is charged, and adjust a stop position of the engine by causing the second motor to perform power running subsequently to a stop of the engine by the first controller in a case where a state of charge of the battery becomes high and the second motor finishes the electricity generation driving.

A revolution position of an engine is set to a revolution position suitable for a start. A control apparatus for an electric vehicle includes an engine, a motor which generates electricity, a battery, a first controller which drives the engine, a second controller which drives the motor, and a sensor. The second controller confirms a relative position relationship between a revolution position of the engine and a rotation position of the motor by acquiring information of the revolution position of the engine from the first controller during the electricity generation driving by the motor and monitors the revolution position of the engine based on the relative position relationship and a signal from the sensor, and the second controller checks the stop position of the engine through the monitoring of the revolution position of the engine when the motor finishes the electricity generation driving.

A control unit is provided for a vehicle having an internal combustion engine with a shaft, which can be coupled to an electric machine or decoupled from the electric machine. The control unit is designed to couple the electric machine to the internal combustion engine during an engine stop of the internal combustion engine. The control unit causes the electric machine to guide the shaft of the internal combustion engine. The control unit determines that a speed of the guided shaft is equal to or less than a speed threshold value and, in response thereto, decouples the electric machine from the internal combustion engine, such that the internal combustion engine stops without being guided by the electric machine.

A system for starting an engine of a vehicle has a fuel injector injecting fuel into a closed intake port to form an air fuel mixture. The system also includes an actuator rotating a crankshaft in a first direction to open the intake port by moving a piston within a cylinder coupled to the crankshaft. A combustion chamber defines between the cylinder and the port receiving the air fuel mixture through the intake port. The actuator rotates the crankshaft in a second direction to close the intake port. A spark plug ignites the air fuel mixture to start the engine. The engine also includes many other disclosed features.