A method for improving a start-up of an internal combustion engine with the aid of a belt-driven starter generator which includes a stator winding and a rotor winding, the starter generator for generating a start-up torque being operated in such a way that the stator winding and the rotor winding are energized essentially at the same time immediately after a start-up request of the starter generator. Also described is a processing unit to perform the method and a computer readable medium.

In a starter, current is passed through a solenoid to use the generated electromagnetic force when pushing a pinion gear toward a ring gear, so that the ring gear is engaged with the pinion gear. For this purpose, the starter includes an electromagnetic solenoid, a spring for urging the pinion gear in a direction opposite to that of the electromagnetic solenoid, a connecting member connected to the pinion gear, a stopper for limiting movement of the connecting member to a predetermined position. Being urged by the spring, the pinion gear is disengaged from the ring gear, and the connecting member is retracted to a predetermined position. The starter includes a control circuit that implements control of passing a predetermined current through the solenoid after the disengagement but before retraction of the connecting member to the predetermined position.

A method of rapid starting an internal combustion engine includes determining that the engine is stopped and detecting an engine start request. The method also includes enabling a starter assembly having a brushless electric motor including a stator and a rotor and configured to drive a pinion gear, and engaging the pinion gear with the engine flywheel. The method also includes determining a present angular position of the rotor relative to the stator configured to generate a first rotor torque. The method additionally includes applying an electrical current to the motor, in response to the determined angular position of the rotor, to turn the rotor to a predetermined starting angular position configured to provide a second torque that is greater than the first torque. Furthermore, the method includes commanding the motor to spin the rotor and thereby apply the second torque via the pinion gear to start the engine.

A system includes an electric machine coupled to an engine and configured to start the engine from an inactive state. A controller executes a first control algorithm while output speed of the electric machine is less than a first speed threshold, and also executes a second control algorithm while the output speed is greater than the first speed threshold and less than a second speed threshold. Additionally, the controller is programmed to execute a third control algorithm while the output speed is greater than the second speed threshold. The first control algorithm includes operating the electric machine using trapezoidal current control with pulse width modulation. The second control algorithm includes operating the electric machine using six-step voltage control with a variable phase advance angle. The third control algorithm includes operating the electric machine using six-step voltage control with a predetermined fixed phase advance angle.

A starter motor controller for a starter motor operatively connected to a single coil solenoid includes a first pair of switches including a first solenoid switch and a second solenoid switch. The first solenoid switch selectively completes a first electrical circuit for delivering a first electrical current to the single coil solenoid and the second solenoid switch selectively completes a second electrical circuit for delivering a second electrical current to the single coil solenoid that is less than the first electrical current. A second pair of switches includes a first starter motor switch and a second starter motor switch. The first starter motor switch selectively completes a first electrical circuit for delivering a first electrical power to the starter motor and the second starter motor switch selectively completes a second electrical circuit for delivering a second electrical power to the starter motor that is greater than the first electrical power.

An assembly for starting an engine comprises a starter to supply a required starting torque to the engine to start the engine in a starting phase, the starter being subject to dispersions varying the value of the torque supplied, an electronic starting device linked to the starter to supply an electrical current to the starter to electrically power it in the starting phase. The starter comprises a device for characterizing the dispersions of the starter, the electronic starting device is configured to cooperate with the device for characterizing the dispersions of the starter so as to determine the dispersions of the starter, and the electronic starting device is configured to adjust the electrical current supplied to the starter as a function of the determined dispersions to compensate the dispersions of the starter, so that the starter supplies the required starting torque to the engine.

A computer that includes at least one processor and memory. The processor of the computer can be programmed to execute instructions stored on the memory that include controlling, based on a temperature, which of a plurality of power sources of a vehicle battery are coupled to a starter circuit during a vehicle ignition event.

A system includes an electric machine coupled to an engine and configured to start the engine from an inactive state. A controller executes a first control algorithm while output speed of the electric machine is less than a first speed threshold, and also executes a second control algorithm while the output speed is greater than the first speed threshold and less than a second speed threshold. Additionally, the controller is programmed to execute a third control algorithm while the output speed is greater than the second speed threshold. The first control algorithm includes operating the electric machine using trapezoidal current control with pulse width modulation. The second control algorithm includes operating the electric machine using six-step voltage control with a variable phase advance angle. The third control algorithm includes operating the electric machine using six-step voltage control with a predetermined fixed phase advance angle.

The invention relates to a method for rotational positioning of a heat engine rotor (3) that is in a stopped position (.sub.A) to a target position (.sub.0), comprising the following steps: a device for detecting the angular position of the rotor (3) determines an angular difference () from the target position (.sub.0), a speed set-point (.sub.c()) as a function of the angular position () of the rotor (3) is established from the angular difference (), with a rising slope less than a predetermined value (a) followed until a high speed value is reached less than a predetermined value (.sub.0), and a falling slope less than a predetermined value (b), the rotor (3) is set in motion following the speed set-point (.sub.c()).

A vehicle propulsion system includes an engine and a first electric machine each configured to selectively provide torque to propel the vehicle. The propulsion system also includes a second electric machine coupled to the engine and configured to start the engine from an inactive state. A controller is programmed to execute a first control algorithm while output speed of the second electric machine is less than a first speed threshold. The controller is also programmed to execute a second control algorithm while output speed of the second electric machine is greater than the first speed threshold and less than a second speed threshold.