Abstract: The disclosure provides a supercharging pressure control device for an internal combustion engine that may suppress misfires of the internal combustion engine caused by a large amount of condensed water and freezing of an intercooler and suppress the decrease in supercharging response under the conditions that such problems are unlikely to occur. The supercharging pressure control device for the internal combustion engine includes a supercharger (turbocharger), an intercooler, a supercharging pressure control part controlling a supercharging pressure based on a target supercharging pressure, and an intake air temperature acquisition part (intake air temperature sensor) acquiring a temperature of the intake air as an intake air temperature, and executes a supercharging pressure reduction control when the intake air temperature is greater than or equal to a specified first threshold temperature or less than or equal to a specified second threshold temperature less than the first threshold temperature.

Abstract: The disclosure provides a supercharging pressure control device for an internal combustion engine that may suppress misfires of the internal combustion engine caused by a large amount of condensed water and freezing of an intercooler and suppress the decrease in supercharging response under the conditions that such problems are unlikely to occur. The supercharging pressure control device for the internal combustion engine includes a supercharger (turbocharger), an intercooler, a supercharging pressure control part controlling a supercharging pressure based on a target supercharging pressure, and an intake air temperature acquisition part (intake air temperature sensor) acquiring a temperature of the intake air as an intake air temperature, and executes a supercharging pressure reduction control when the intake air temperature is greater than or equal to a specified first threshold temperature or less than or equal to a specified second threshold temperature less than the first threshold temperature.

Abstract: An engine peripheral structure includes an engine body mounted in an engine room, an intake system connected to the engine body, and a supercharger provided in the middle of the intake system. The intake system includes a low-pressure intake passage connected upstream in an intake direction of the supercharger, and a high-pressure intake passage connected downstream in the intake direction of the supercharger. The intake system has the high-pressure intake passage turned back at the supercharger with respect to the low-pressure intake passage, and has the low-pressure intake passage and the high-pressure intake passage extended on a left side surface of the engine body so as to be at least partly overlapped with each other in the up-down direction V.

Abstract: An engine peripheral structure includes an engine body mounted in an engine room, an intake system connected to the engine body, and a supercharger provided in the middle of the intake system. The intake system includes a low-pressure intake passage connected upstream in an intake direction of the supercharger, and a high-pressure intake passage connected downstream in the intake direction of the supercharger. The intake system has the high-pressure intake passage turned back at the supercharger with respect to the low-pressure intake passage, and has the low-pressure intake passage and the high-pressure intake passage extended on a left side surface of the engine body so as to be at least partly overlapped with each other in the up-down direction V.

Abstract: To elongate an exhaust tail pipe wherein a muffler is covered by a rear cowl. An exhaust structure of a vehicle including a rear cowl covering a vehicle rear portion, a rear bank-muffler including a first and second expansion chamber partitioned by a partition, a first and second connecting pipe connecting the expansion chambers, and a tail pipe configured to discharge exhaust air from the rear bank-muffler. The rear bank-muffler is covered by the rear cowl, wherein outlines of the rear bank-muffler and the rear cowl are each formed such that the width decreases toward the vehicle rear. The tail pipe, the first connecting pipe, and the second connecting pipe are provided so as to penetrate the partition. A position where the tail pipe penetrates the partition and positions where the first connecting pipe and second connecting pipe penetrate the partition are offset from each other in the vertical direction.

Abstract: To elongate an exhaust tail pipe wherein a muffler is covered by a rear cowl. An exhaust structure of a vehicle including a rear cowl covering a vehicle rear portion, a rear bank-muffler including a first and second expansion chamber partitioned by a partition, a first and second connecting pipe connecting the expansion chambers, and a tail pipe configured to discharge exhaust air from the rear bank-muffler. The rear bank-muffler is covered by the rear cowl, wherein outlines of the rear bank-muffler and the rear cowl are each formed such that the width decreases toward the vehicle rear. The tail pipe, the first connecting pipe, and the second connecting pipe are provided so as to penetrate the partition. A position where the tail pipe penetrates the partition and positions where the first connecting pipe and second connecting pipe penetrate the partition are offset from each other in the vertical direction.

Abstract: A secondary air supply system is arranged efficiently and compactly, in a V-type engine including a front-side cylinder and a rear-side cylinder. A motorcycle has a secondary air supply system which is provided between an air cleaner and an exhaust passage of an engine. The secondary air is supplied from the air cleaner into the exhaust passage of the engine. The secondary air supply system has a reed valve in a position for being exposed to the exhaust passage. The reed valve includes a front-side reed valve used for a front-side cylinder and a rear-side reed valve used for a rear-side cylinder. The front-side reed valve is disposed at a front portion of the air cleaner, with the longitudinal direction of the front-side reed valve set along the height direction.

Abstract: An exhaust system for a motorcycle having a catalyzer casing that is accommodated in an exhaust muffler. The exhaust muffler is provided at opposite sides thereof in the vehicle width direction with lateral walls that are inclined so as to come closer to each other as they extend downward. A bent section is formed in an intermediate portion, within the exhaust muffler, of an exhaust gas conduit passing through a front end wall of the exhaust muffler and changes the flow direction of exhaust gas from the forward and rearward direction of the vehicle to the vehicle width direction. The catalyzer casing has one end connected to a downstream end portion of the exhaust gas conduit and is arranged in an inclined condition to be lowered as it approaches one side of the muffler in the vehicle width direction.

Abstract: A secondary air supply system is arranged efficiently and compactly, in a V-type engine including a front-side cylinder and a rear-side cylinder. A motorcycle has a secondary air supply system which is provided between an air cleaner and an exhaust passage of an engine. The secondary air is supplied from the air cleaner into the exhaust passage of the engine. The secondary air supply system has a reed valve in a position for being exposed to the exhaust passage. The reed valve includes a front-side reed valve used for a front-side cylinder and a rear-side reed valve used for a rear-side cylinder. The front-side reed valve is disposed at a front portion of the air cleaner, with the longitudinal direction of the front-side reed valve set along the height direction.

Abstract: An exhaust system for a motorcycle having a catalyzer casing that is accommodated in an exhaust muffler. The exhaust muffler is provided at opposite sides thereof in the vehicle width direction with lateral walls that are inclined so as to come closer to each other as they extend downward. A bent section is formed in an intermediate portion, within the exhaust muffler, of an exhaust gas conduit passing through a front end wall of the exhaust muffler and changes the flow direction of exhaust gas from the forward and rearward direction of the vehicle to the vehicle width direction. The catalyzer casing has one end connected to a downstream end portion of the exhaust gas conduit and is arranged in an inclined condition to be lowered as it approaches one side of the muffler in the vehicle width direction.