Abstract: Each of recesses in outer circumferential surfaces of rotors includes: a leading-side area extending forward from a longitudinal center of an associated one of the outer circumferential surfaces in a rotation direction of the rotor, and a trailing-side area continuous with the leading-side area, and extending rearward from the longitudinal center in the rotation direction. From the longitudinal center of the associated one of the outer circumferential surfaces in the rotation direction, forward extension of the leading-side area is longer than rearward extension of the trailing-side area. The leading-side area has a larger volume than the trailing-side area.

Abstract: Each of recesses in outer circumferential surfaces of rotors includes: a leading-side area extending forward from a longitudinal center of an associated one of the outer circumferential surfaces in a rotation direction of the rotor, and a trailing-side area continuous with the leading-side area, and extending rearward from the longitudinal center in the rotation direction. From the longitudinal center of the associated one of the outer circumferential surfaces in the rotation direction, forward extension of the leading-side area is longer than rearward extension of the trailing-side area. The leading-side area has a larger volume than the trailing-side area.

Abstract: A vehicle includes a generator, an internal combustion engine for driving the generator, a catalytic device, and a controller for controlling the operation of the internal combustion engine. At a start of the internal combustion engine to allow the generator to start generating electricity, the controller, until the catalytic device reaches an activated state, operates the internal combustion engine in a warm-up mode such that the driving force of the internal combustion engine for driving the generator is below a value at which electricity is generated, and the controller, after the catalytic device reaches the activated state, operates the internal combustion engine in an electricity generating operating mode such that the driving force of the internal combustion engine is enhanced to the value at which electricity is generated to allow the generator to generate a predetermined quantity of electricity.

Abstract: A vehicle includes a generator, an internal combustion engine for driving the generator, a catalytic device, and a controller for controlling the operation of the internal combustion engine. At a start of the internal combustion engine to allow the generator to start generating electricity, the controller, until the catalytic device reaches an activated state, operates the internal combustion engine in a warm-up mode such that the driving force of the internal combustion engine for driving the generator is below a value at which electricity is generated, and the controller, after the catalytic device reaches the activated state, operates the internal combustion engine in an electricity generating operating mode such that the driving force of the internal combustion engine is enhanced to the value at which electricity is generated to allow the generator to generate a predetermined quantity of electricity.

Abstract: An automobile engine control system estimates a required amount of intake air to be introduced at the end of an intake stroke, based on a change in a factual amount of intake air introduced prior to the end of an intake stroke, and determines a control parameter for controlling engine output based on the required amount of intake air. When the engine operates in a high pulsation range of engine loads, in which pulsation of intake air is at a high level, the determination of the control parameter is based on the required amount of intake air.