Patent ID: 7983833
Filing Date: 2011-07-19
Classification: B60K,B60L,B60W,F02D,F02N,Y02T

Abstract:
1. An internal combustion engine system including an internal combustion engine and a motor configured to enable torque output to an output shaft of the internal combustion engine, the internal combustion engine system comprising: a rotational position sensor constructed to detect a rotational position of the output shaft of the internal combustion engine; a rotation speed sensor constructed to measure a rotation speed of the internal combustion engine as an engine rotation speed; a temperature sensor constructed to measure a temperature of a medium reflecting a temperature of the internal combustion engine; and an engine stop-time controller configured to, in response to a request for stopping operation of the internal combustion engine, control the internal combustion engine to stop fuel supply to the internal combustion engine and ignition, until the engine rotation speed measured by the rotation speed sensor decreases to a correction start rotation speed, the engine stop-time controller controlling the motor to output a rotation speed-decreasing torque that is a torque for smoothly decreasing the rotation speed of the internal combustion engine, after the engine rotation speed measured by the rotation speed sensor decreases to the correction start rotation speed, with a view to preventing the rotational position of the output shaft from exceeding a top dead center immediately before a stop of the internal combustion engine, the engine stop-time controller controlling the motor to output an engine stop torque as a sum of a correction torque and the rotation speed-decreasing torque, where the correction torque is set corresponding to the rotational position of the output shaft detected by the rotational position sensor at the measured engine rotation speed decreasing to the correction start rotation speed, when the temperature measured by the temperature sensor is not less than a preset reference temperature at the measured engine rotation speed decreasing to the correction start rotation speed, the engine stop-time controller using a torque corresponding to the temperature measured by the temperature sensor as the correction torque, when the temperature measured by the temperature sensor is less than the preset reference temperature at the measured engine rotation speed decreasing to the correction start rotation speed, the engine stop-time controller using the rotation speed-decreasing torque as the engine stop torque.